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CN111385946B - Pixel lamp brightness control method and device - Google Patents

Pixel lamp brightness control method and device Download PDF

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CN111385946B
CN111385946B CN202010207556.3A CN202010207556A CN111385946B CN 111385946 B CN111385946 B CN 111385946B CN 202010207556 A CN202010207556 A CN 202010207556A CN 111385946 B CN111385946 B CN 111385946B
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pixel
projection
light source
lamp
pixel light
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CN111385946A (en
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赵淑明
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Beijing Jingwei Hirain Tech Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • B60Q1/06—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights adjustable, e.g. remotely-controlled from inside vehicle
    • B60Q1/08—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights adjustable, e.g. remotely-controlled from inside vehicle automatically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F19/00—Advertising or display means not otherwise provided for
    • G09F19/12—Advertising or display means not otherwise provided for using special optical effects
    • G09F19/18—Advertising or display means not otherwise provided for using special optical effects involving the use of optical projection means, e.g. projection of images on clouds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q2400/00—Special features or arrangements of exterior signal lamps for vehicles
    • B60Q2400/50—Projected symbol or information, e.g. onto the road or car body

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Abstract

The application provides a pixel lamp brightness control method and a device, and the method comprises the following steps: respectively determining the projection brightness value of each projection pixel point in the pattern to be projected, and respectively determining the position of a pixel light source corresponding to each projection pixel point; respectively determining the brightness correction parameters of the pixel light sources corresponding to each projection pixel point according to the relationship between the projection light intensity of the pixel light source of the pixel lamp and the position of the pixel light source corresponding to each projection pixel point; and controlling the pixel light source corresponding to each projection pixel point to be turned on according to the projection brightness value of each projection pixel point and the brightness correction parameter of the pixel light source corresponding to each projection pixel point. The control method can be applied to the pixel lamp, and can allow a user to freely adjust the brightness distribution of the pixel lamp projection pattern.

Description

Pixel lamp brightness control method and device
Technical Field
The application relates to the technical field of automatic illumination control, in particular to a pixel lamp brightness control method and device.
Background
The pixel lamp is composed of a pixel light source of high integration. Because each pixel light source of the pixel lamp can be independently controlled, the lighting adjustability of the pixel lamp is more flexible, and the application is more and more extensive. In the field of automotive electronics, for example, the application of pixel lamps makes the automation and adaptive lighting of automotive headlamps easier to implement and more effective.
In the case where the luminous flux emitted from the pixel light source is constant, the projection luminance value of the pixel lamp is lower, that is, the projection luminance is darker, as the projection position of the pixel lamp is farther from the pixel lamp. In many cases, the projection plane of a pixel lamp is parallel to the optical axis, for example, the projection plane of an automobile pixel lamp is on the ground, and the optical axis is parallel to the ground, so that the distances between each part of the pattern projected onto the projection plane and the pixel lamp are different, and the brightness of different parts of the same projection pattern is different. In the above scenario, the projection brightness of the pixel lamp is affected by the imaging rule and the position of the projection plane, but the brightness distribution of the projection pattern cannot be customized by the user, for example, the user cannot adjust the brightness of the projection pattern to be uniform brightness or to be an arbitrary brightness distribution desired by the user.
Disclosure of Invention
Based on the defects and shortcomings of the prior art, the application provides a pixel lamp brightness control method and device, which can control a pixel lamp to form projection with any brightness at a projection pixel point, so that a user can define the brightness distribution of a projection pattern.
A pixel lamp brightness control method, comprising:
respectively determining the projection brightness value of each projection pixel point in the pattern to be projected, and respectively determining the position of a pixel light source corresponding to each projection pixel point;
respectively determining the brightness correction parameters of the pixel light sources corresponding to each projection pixel point according to the relationship between the projection light intensity of the pixel light source of the pixel lamp and the position of the pixel light source corresponding to each projection pixel point;
and controlling the pixel light source corresponding to each projection pixel point to be turned on according to the projection brightness value of each projection pixel point and the brightness correction parameter of the pixel light source corresponding to each projection pixel point.
Optionally, the relationship between the projection light intensity of the pixel light source and the position of the pixel light source includes a positive correlation between the projection light intensity of the pixel light source and a vertical distance from the pixel light source to the optical axis of the pixel lamp.
Optionally, the determining, according to the relationship between the projection light intensity of the pixel light source of the pixel lamp and the position of the pixel light source, and the position of the pixel light source corresponding to each projection pixel point, the brightness correction parameter of the pixel light source corresponding to each projection pixel point respectively includes:
respectively determining the brightness correction parameters of the pixel light sources corresponding to each projection pixel point according to the positive correlation relationship between the vertical distance between the pixel light source of the pixel lamp and the optical axis of the pixel lamp and the projection light intensity of the pixel light source and the vertical distance between the pixel light source corresponding to each projection pixel point and the optical axis of the pixel lamp;
and the value of the brightness correction parameter of the pixel light source corresponding to each projection pixel point and the vertical distance between the pixel light source corresponding to each projection pixel point and the optical axis of the pixel lamp form a negative correlation relationship.
Optionally, the determining the brightness correction parameter of the pixel light source corresponding to each projection pixel point respectively includes:
and respectively determining the brightness correction parameters of the pixel light sources corresponding to each projection pixel point according to the rule that the brightness correction parameters of the pixel light sources and the third power of the vertical distance between the pixel light sources and the optical axis of the pixel lamp are in inverse proportion.
Optionally, the determining the brightness correction parameter of the pixel light source corresponding to each projection pixel point respectively includes:
inquiring and determining the brightness correction parameters of the pixel light sources corresponding to each projection pixel point from a preset brightness correction parameter inquiry table;
the brightness correction parameter lookup table comprises a numerical value corresponding relation between the brightness correction parameter and the vertical distance between the pixel light source and the optical axis of the pixel lamp.
Optionally, the controlling, according to the projection brightness value of each projection pixel and the brightness correction parameter of the pixel light source corresponding to each projection pixel, the pixel light source corresponding to each projection pixel to be turned on includes:
respectively determining the light-emitting brightness value of the pixel light source corresponding to each projection pixel point according to the projection brightness value of each projection pixel point and the brightness correction parameter of the pixel light source corresponding to each projection pixel point;
and controlling the pixel light source corresponding to each projection pixel point to be lightened according to the light-emitting brightness value of the pixel light source corresponding to each projection pixel point.
Optionally, the determining the position of the pixel light source corresponding to each projection pixel point respectively includes:
and respectively determining the positions of the pixel light sources corresponding to the projection pixel points on the light type negative film of the pixel lamp according to the position coordinates of the projection pixel points on the projection plane of the pixel lamp and the imaging rule of the pixel lamp.
A pixel lamp luminance control apparatus, comprising:
the data acquisition unit is used for respectively determining the projection brightness value of each projection pixel point in the pattern to be projected and respectively determining the position of the pixel light source corresponding to each projection pixel point;
the parameter calculation unit is used for respectively determining the brightness correction parameters of the pixel light sources corresponding to the projection pixel points according to the relationship between the projection light intensity of the pixel light sources of the pixel lamps and the positions of the pixel light sources corresponding to the projection pixel points;
and the brightness control unit is used for controlling the pixel light source corresponding to each projection pixel point to be lightened according to the projection brightness value of each projection pixel point and the brightness correction parameter of the pixel light source corresponding to each projection pixel point.
Optionally, the relationship between the projection light intensity of the pixel light source and the position of the pixel light source includes a positive correlation between the projection light intensity of the pixel light source and a vertical distance from the pixel light source to the optical axis of the pixel lamp.
Optionally, when the parameter calculating unit determines the brightness correction parameters of the pixel light sources corresponding to each projection pixel point according to the relationship between the projection light intensity of the pixel light source of the pixel lamp and the position of the pixel light source corresponding to each projection pixel point, the parameter calculating unit is specifically configured to:
respectively determining the brightness correction parameters of the pixel light sources corresponding to each projection pixel point according to the positive correlation between the vertical distance between the pixel light source of the pixel lamp and the optical axis of the pixel lamp and the projection light intensity of the pixel light source and the vertical distance between the pixel light source corresponding to each projection pixel point and the optical axis of the pixel lamp;
and the value of the brightness correction parameter of the pixel light source corresponding to each projection pixel point and the vertical distance between the pixel light source corresponding to each projection pixel point and the optical axis of the pixel lamp form a negative correlation relationship.
Optionally, when the parameter calculating unit determines the brightness correction parameter of the pixel light source corresponding to each projection pixel point, the parameter calculating unit is specifically configured to:
and respectively determining the brightness correction parameters of the pixel light sources corresponding to each projection pixel point according to the rule that the brightness correction parameters of the pixel light sources and the third power of the vertical distance between the pixel light sources and the optical axis of the pixel lamp are in inverse proportion.
Optionally, the determining the brightness correction parameter of the pixel light source corresponding to each projection pixel point respectively includes:
inquiring and determining the brightness correction parameters of the pixel light sources corresponding to each projection pixel point from a preset brightness correction parameter lookup table;
the brightness correction parameter lookup table comprises a numerical value corresponding relation between the brightness correction parameter and the vertical distance between the pixel light source and the optical axis of the pixel lamp.
Optionally, when the brightness control unit controls the pixel light source corresponding to each projection pixel point to be turned on according to the projection brightness value of each projection pixel point and the brightness correction parameter of the pixel light source corresponding to each projection pixel point, the brightness control unit is specifically configured to:
respectively determining the light-emitting brightness value of the pixel light source corresponding to each projection pixel point according to the projection brightness value of each projection pixel point and the brightness correction parameter of the pixel light source corresponding to each projection pixel point;
and controlling the pixel light source corresponding to each projection pixel point to be lightened according to the light-emitting brightness value of the pixel light source corresponding to each projection pixel point.
Optionally, when the data obtaining unit determines the position of the pixel light source corresponding to each projection pixel point, the data obtaining unit is specifically configured to:
and respectively determining the positions of the pixel light sources corresponding to the projection pixel points on the light type negative film of the pixel lamp according to the position coordinates of the projection pixel points on the projection plane of the pixel lamp and the imaging rule of the pixel lamp.
The pixel lamp brightness control method determines brightness correction parameters of pixel light sources corresponding to projection pixel points according to the projection brightness value of each projection pixel point in a pattern to be projected and the relation between the pixel light source projection light intensity and the pixel light source position of the pixel lamp; and then controlling the pixel light source corresponding to the projection pixel point to be lightened according to the projection brightness value of the projection pixel point and the brightness correction parameter of the pixel light source corresponding to the projection pixel point. The process realizes the reverse adjustment of the brightness of the pixel light source corresponding to the projection pixel point according to the projection brightness value of the projection pixel point, can control the pixel lamp to form projection with any brightness at the projection pixel point, and can allow a user to freely adjust the brightness distribution of the projection pattern of the pixel lamp by applying the control method to the pixel lamp.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic diagram illustrating a relationship between a projection illuminance and a projection area of a pixel lamp according to an embodiment of the present disclosure;
FIG. 2 is a schematic side view of a pixel lamp imaging provided by an embodiment of the present application;
fig. 3 is a schematic flowchart of a method for controlling brightness of a pixel lamp according to an embodiment of the present disclosure;
FIG. 4 is a schematic top view of a pixel lamp imaging provided by an embodiment of the present application;
FIG. 5 is a schematic diagram of a pattern to be projected according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of a light flux distribution of a pixel light source corresponding to the pattern to be projected shown in fig. 5, provided by an embodiment of the present application;
FIG. 7 is a schematic diagram of another pattern to be projected according to an embodiment of the present application;
fig. 8 is a schematic diagram of a light flux distribution of a pixel light source corresponding to the pattern to be projected shown in fig. 7 according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a luminance control apparatus for a pixel lamp according to an embodiment of the present disclosure.
Detailed Description
The technical scheme of the embodiment of the application is suitable for the application scene of controlling and adjusting the brightness of the pixel lamp, and the projection brightness of the pixel lamp at any projection position can be freely adjusted by a user according to the requirement by adjusting and controlling the brightness of the pixel lamp.
A large number of pixel light sources are distributed on the light-type negative film of the pixel lamp, and the whole light-type negative film is used as a light-emitting surface of the pixel lamp, and the light-emitting surface is positioned at the focal length position of a lens of the pixel lamp. If the losses of light through the air are neglected, the change in the position of the projection screen does not affect the magnitude of the luminous flux phi emitted by the light-emitting surface. Then, as shown in fig. 1, for the same luminous flux phi emitted from the light emitting surface S, when the positions of the projection screens of the pixel lamps are different, a projection area S is generated on the projection screent1And St2So that the luminous flux per unit area on the projection screen, i.e. the illuminance value
Figure BDA0002421668130000061
Different. As can be seen from this, when the luminous flux emitted from the light emitting surface of the pixel lamp is constant, the projection area increases as the projection position is farther from the pixel lamp, and the image becomes darker as the illuminance value decreases.
Based on the above-mentioned change characteristics of the illumination brightness of the pixel lamp, when the projection plane of the pixel lamp is perpendicular to the optical axis of the pixel lamp, the distances from the projection points on the projection plane to the pixel lamp can be ensured to be basically consistent, and therefore the brightness of the projection pattern on the projection plane is also basically consistent.
In many cases, however, the projection plane of the pixel lamp is not exactly perpendicular to its optical axis. For example, when the pixel lamp is used as a car lighting lamp, the projection plane of the pixel lamp is located on the ground in front of the car, and as shown in fig. 2, the light emitted from the a-point pixel light source on the light type film of the pixel lamp is projected to the a' point on the ground, and the projection plane 4 of the pixel lamp is parallel to the optical axis (X axis in the figure) of the pixel lamp.
In this case, the projection patterns of the pixel lamps are tiled on the projection planes of the pixel lamps, which causes different distances between different parts of the same projection pattern and the pixel lamps, and at this time, the brightness distribution of the projection pattern is affected by the imaging characteristics of the pixel lamps and the positions of the projection planes, but the brightness of the projection pattern cannot be customized, for example, the brightness of the projection pattern cannot be adjusted to be uniform or to be any brightness distribution desired by the user. .
In order to solve the above problem, the inventors of the present application propose a pixel lamp luminance control method, which enables a user to freely control the luminance distribution of a projection pattern by controlling the light emission luminance of a pixel lamp pixel light source.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
An embodiment of the present application provides a method for controlling luminance of a pixel lamp, as shown in fig. 3, the method includes:
s301, respectively determining the projection brightness value of each projection pixel point in the pattern to be projected, and respectively determining the position of the pixel light source corresponding to each projection pixel point.
Specifically, the pattern to be projected is a light pattern that is desired to be formed by irradiating a projection plane of a pixel lamp with a pixel lamp, or is an entire or partial projection pattern that a user desires to adjust the projection brightness. The projection plane of the pixel lamp is a plane where the projection area of the pixel lamp is located.
Each projection pixel point in the pattern to be projected refers to each pixel point included in the pattern range of the pattern to be projected when the pattern to be projected is projected and displayed on the projection plane. It will be appreciated that a large number of projected pixel points arranged according to a given rule may form a projected pattern, similar to the pixel arrangement making up an image.
When the pattern to be projected is determined, the brightness of the pattern to be projected is also determined, that is, the projection brightness value of each projection pixel point in the pattern to be projected is determined. The projection brightness values of all projection pixel points in the pattern to be projected can be the same or different, and the specific numerical values can be freely set by a user according to projection requirements.
On the other hand, when each projection pixel point of the pattern to be projected is determined, the embodiment of the application further determines the position of the pixel light source corresponding to each projection pixel point according to the imaging rule of the pixel lamp. As shown in fig. 1 or fig. 2, light emitted from a pixel light source at a certain position on the light type negative film of the pixel lamp is refracted by the pixel lamp lens and then projected onto the projection plane of the pixel lamp. Therefore, after each projection pixel point of the pattern to be projected on the projection plane of the pixel lamp is determined, the pixel light source corresponding to each projection pixel point can be determined by calculation according to the imaging rule shown in fig. 1 or fig. 2, and then the position of each pixel light source can be determined.
As an exemplary implementation manner, the position of the pixel light source is expressed as a position (u, v) of the pixel light source on the light type negative film of the projection lamp, wherein u represents a horizontal distance from the pixel light source to the optical axis of the pixel lamp, and v represents a vertical distance from the pixel light source to the optical axis of the pixel lamp.
S302, according to the relation between the pixel light source projection light intensity of the pixel lamp and the position of the pixel light source corresponding to each projection pixel point, respectively determining the brightness correction parameters of the pixel light source corresponding to each projection pixel point.
The relationship between the projection light intensity of the pixel light source of the pixel lamp and the position of the pixel light source refers to the relationship that the projection light intensity of the pixel light source of the pixel lamp on the projection plane of the pixel lamp changes along with the change of the position of the pixel light source on the pixel lamp type negative film.
As shown in fig. 1 and fig. 2, when the projection plane of the pixel lamp is parallel to the optical axis of the pixel lamp, the light emitted from the pixel light source at different positions on the pixel light type negative film will be projected to different projection positions on the projection plane of the pixel lamp. In general, the luminous flux emitted from the pixel light source is equal to the luminous flux projected onto the projection plane, and the projection luminance of the luminous flux emitted from the pixel lamp is different when the projection position is at a different distance from the pixel lamp. Therefore, it can be understood that the projection light intensity of the pixel light source of the pixel lamp is related to the position of the pixel light source on the pixel lamp type negative film, when the luminous flux emitted by the pixel light source is constant, the farther the projection position of the pixel light source is away from the pixel lamp, the lower the projection brightness thereof is, and the closer the projection position of the pixel light source is to the pixel lamp, the higher the projection brightness thereof is.
Based on the above projection rule of the pixel lamp, in order to make the brightness of the projection patterns at different positions on the projection plane of the pixel lamp the same, the brightness of the light emitted by the pixel light source corresponding to each projection position on the projection plane should be adjusted. Theoretically, if the projection brightness of each part of the projection pattern is the same, the light-emitting brightness of the pixel light source corresponding to the projection position far away from the pixel lamp should be stronger, and the light-emitting brightness of the pixel light source corresponding to the projection position near the pixel lamp should be weaker, so that the light-emitting brightness of the pixel light source of the pixel lamp is set differently, and the brightness of the projection pattern of the pixel lamp can be uniform.
Therefore, after the projection brightness value of each projection pixel point of the pattern to be projected is determined, the brightness correction parameter of the pixel light source corresponding to each projection pixel point is calculated by combining the position of the pixel light source corresponding to each projection pixel point according to the relationship between the projection light intensity of the pixel light source of the pixel lamp and the position of the pixel light source.
The brightness correction parameter is a parameter for adjusting the brightness of the pixel light source corresponding to the projection pixel point according to the projection brightness value of the projection pixel point. The specific value of the brightness correction parameter should ensure that, after the brightness of the pixel light source is adjusted according to the brightness correction parameter, the projection brightness value of the light emitted by the pixel light source at the corresponding projection position is equal to the projection brightness value of the pattern to be projected at the projection position determined in step S301.
And S303, controlling the pixel light source corresponding to each projection pixel point to be lightened according to the projection brightness value of each projection pixel point and the brightness correction parameter of the pixel light source corresponding to each projection pixel point.
Specifically, when the projection brightness value of each projection pixel point is determined, and the brightness correction parameter of the pixel light source corresponding to each projection pixel point is determined, the brightness correction parameter of the pixel light source corresponding to the projection pixel point is used as an adjustment amount based on the projection brightness value of the projection pixel point, and the pixel light source corresponding to the projection pixel point is controlled to be turned on according to the adjustment result brightness value.
It can be understood that, since the brightness value when the pixel light source is turned on is calculated according to the projection brightness value at the projection position, and the adjustment of the light emission brightness value is in accordance with the relationship between the projection light intensity of the pixel light source and the position of the pixel light source, when the pixel light source emits light according to the adjusted brightness value, the projection brightness at the projection pixel point corresponding to the pixel light source is the projection brightness value, that is, the projection brightness value in accordance with the expectation of the user can be obtained.
As can be seen from the above description, according to the pixel lamp brightness control method provided in the embodiment of the present application, a brightness correction parameter of a pixel light source corresponding to a projection pixel point is determined according to a projection brightness value of each projection pixel point in a pattern to be projected and a relationship between a pixel light source projection light intensity of the pixel lamp and a pixel light source position; and then controlling the pixel light source corresponding to the projection pixel point to be lightened according to the projection brightness value of the projection pixel point and the brightness correction parameter of the pixel light source corresponding to the projection pixel point. The process realizes the reverse adjustment of the brightness of the pixel light source corresponding to the projection pixel point according to the projection brightness value of the projection pixel point, can control the pixel lamp to form projection with any brightness at the projection pixel point, and can allow a user to freely adjust the brightness distribution of the projection pattern of the pixel lamp by applying the control method to the pixel lamp.
Illustratively, the embodiment of the present application further discloses that the relationship between the projection light intensity of the pixel light source and the position of the pixel light source includes a positive correlation between the projection light intensity of the pixel light source and the vertical distance from the pixel light source to the optical axis of the pixel light.
Specifically, referring to the side view of the pixel lamp projection principle shown in fig. 2, the light type negative plate 2 of the pixel lamp is located on the focal plane of the lens group 3, so the distance between 2 and 3 is the focal length f of the lens group 3, and the height of the optical axis of the pixel lamp from the ground is h. The point a on the light type negative plate 2 is projected on the projection plane of the ground to form a projection pattern a'. The three-dimensional coordinate system is established by taking the center of the lens group 3 as a midpoint, and assuming that the coordinate of the point a on the light type negative film is (u, v), wherein the coordinate values are only used for representing the distance and the length, so that positive values are all taken, i.e. u >0, v >0, then according to the convex lens imaging principle, it can be known that:
Figure BDA0002421668130000091
the top view of the pixel lamp projection principle shown in fig. 1 is shown in fig. 4, and also according to the convex lens imaging principle, it can be determined that:
Figure BDA0002421668130000101
wherein the gray frame area shown in FIG. 4 is the projection plane of the pixel lamp, dist in the above formulaa'And posya'The coordinates of the projection pattern a 'on the projection plane, which are respectively the coordinate of the projection pattern a' on the projection plane along the Y-axis direction and the coordinate along the X-axis direction, namely the coordinate (u, v) of the light pattern a on the light type negative film of the projection lamp, are projected onto the projection plane through the lens group of the projection lamp to obtain the coordinate (dist)a',posya'). Further, each coordinate value in the above formula is used only for indicating a distance from the corresponding coordinate value, and thus the specific numerical value thereof is a positive value, and thus the above formula is used only for indicating the relative positional relationship and the distance relationship between the light pattern and the projected pattern.
The position relation between the light type pattern a and the projection pattern a' can reflect the imaging rule of the pixel lamp, and the position coordinate of the light type pattern on the light type negative film of the pixel lamp and the position coordinate of the projection pattern obtained by projecting the light type pattern to the projection plane can meet the position relation shown by the formula.
For the position of each pixel light source on the light type negative film, its area S ═ jeq-Sdudv, combined with the above equations (1) and (2), shows that the projected area is:
Figure BDA0002421668130000102
further, the illumination value at the projection area can be determined as follows according to an illumination value calculation formula:
Figure BDA0002421668130000103
wherein,
Figure BDA0002421668130000104
β is an area/position dependent luminous flux coefficient. It is understood that in the case where β is 1, i.e., the input light flux is the same, the pixel light source projected light intensity E is positively correlated with the perpendicular distance v of the pixel light source from the optical axis of the pixel lamp.
The relationship between the projection light intensity of the pixel light source and the position of the pixel light source can be determined to accord with the imaging rule of the pixel lamp and the projection brightness distribution characteristic of the pixel lamp.
When the relation between the projection light intensity of the pixel light source of the pixel lamp and the position of the pixel light source is clarified, the brightness correction parameter of the pixel light source can be determined according to the vertical distance between the pixel light source corresponding to the projection pixel point and the optical axis of the pixel lamp, and the brightness correction parameter is used for adjusting the brightness of the pixel light source so that the projection brightness of the pixel light source at the corresponding projection pixel point accords with the expected projection brightness value.
For example, based on the relationship between the projection light intensity of the pixel light source and the position of the pixel light source, when determining the luminance correction parameter of the pixel light source corresponding to each projection pixel point according to the relationship between the projection light intensity of the pixel light source of the pixel lamp and the position of the pixel light source corresponding to each projection pixel point, the embodiment of the present application specifically includes:
respectively determining the brightness correction parameters of the pixel light sources corresponding to each projection pixel point according to the positive correlation between the vertical distance between the pixel light source of the pixel lamp and the optical axis of the pixel lamp and the projection light intensity of the pixel light source and the vertical distance between the pixel light source corresponding to each projection pixel point and the optical axis of the pixel lamp;
and the value of the brightness correction parameter of the pixel light source corresponding to each projection pixel point and the vertical distance between the pixel light source corresponding to each projection pixel point and the optical axis of the pixel lamp form a negative correlation relationship.
Specifically, in the embodiment of the present application, the setting of the brightness correction parameter of the pixel light source is started with reference to the luminous flux of the pixel light source corresponding to the projection pixel point where the pattern to be projected is farthest from the pixel lamp.
In the whole pattern to be projected, the vertical distance between the pixel light source corresponding to the projection pixel point farthest from the pixel lamp and the optical axis of the pixel lamp is the smallest, and when the brightness of the pattern to be projected is fixed, the luminous flux emitted by the pixel light source corresponding to the projection pixel point needs to be higher. In the embodiment of the application, the luminous flux of the pixel light source corresponding to the projection pixel point is used as a reference, and the brightness correction parameters are set for the pixel light sources corresponding to other projection pixel points.
It can be understood that, since the vertical distance between the pixel light source of the pixel lamp and the optical axis of the pixel lamp is positively correlated with the projection light intensity of the pixel light source, when the brightness of the pattern to be projected is uniform, if the luminous flux of the pixel light source corresponding to the projection pixel point farthest from the pixel lamp in the pattern to be projected (i.e. the pixel light source closest to the optical axis of the pixel lamp) is determined, the luminous fluxes of the pixel light sources corresponding to other projection pixel points should be gradually reduced as the distance from the pixel light axis is increased, so that it can be ensured that the projection brightness of each projection pixel point in the pattern to be projected, which is different from the pixel lamp. At this time, it should be ensured that the value of the luminance correction parameter of the pixel light source corresponding to each projection pixel point is in a negative correlation with the distance between the pixel light source corresponding to each projection pixel point and the optical axis of the pixel lamp.
It should be noted that, when the reference for setting the brightness correction parameter of the pixel light source corresponding to the pattern to be projected is changed, the correlation between the value of the brightness correction parameter of the pixel light source and the vertical distance between the pixel light source and the optical axis of the pixel lamp may also be changed, and the specific setting may be performed as described with reference to the embodiment of the present application.
As an optional implementation manner, according to the value of the brightness correction parameter of the pixel light source corresponding to each projection pixel point, the vertical distance between the pixel light source corresponding to each projection pixel point and the optical axis of the pixel lamp is in a negative correlation relationship, and when the brightness correction parameter of the pixel light source corresponding to each projection pixel point is respectively determined in the embodiment of the present application, the method specifically includes:
and respectively determining the brightness correction parameters of the pixel light sources corresponding to each projection pixel point according to the rule that the brightness correction parameters of the pixel light sources and the third power of the vertical distance between the pixel light sources and the optical axis of the pixel lamp are in inverse proportion.
Specifically, according to the above formula (4), if the illuminance E of the pixel to be projected is a fixed value, i.e. the brightness of the pattern to be projected is uniform, the light flux coefficient β and the third power v of the vertical distance between the pixel light source and the optical axis of the pixel lamp should be adjusted3In inverse proportion. In accordance with this requirement, the embodiments of the present application set the luminance correction parameter for the pixel light source, the value of which should match the value of the above-mentioned luminous flux coefficient β, i.e., the third power v of the perpendicular distance from the pixel light source to the optical axis of the pixel lamp3In an inverse relationship.
For example, if an arrow with uniform brightness as shown in fig. 5 needs to be projected on the ground by the automobile pixel lamp, as shown in fig. 6, the luminance correction coefficient of the pixel light source in the first row on the light type film corresponding to the arrow pattern is set to 1, and the luminance correction parameters of the pixel light sources in the other rows are set so that the distribution of the luminous flux of the pixel light sources adjusted according to the set luminance correction parameters is as shown in fig. 6, wherein darker gray scales indicate that the luminous flux is larger. At this time, the luminance correction parameter settings for each row of pixel light sources are as shown in table 1. As can be seen from table 1 and fig. 6, in order to obtain an arrow pattern with uniform brightness, the brightness of the arrow pattern on the pixel light type negative film should be smaller and smaller as the pixel light source is farther from the optical axis, and correspondingly, the brightness correction parameter of the pixel light source should be smaller and smaller as the pixel light source is farther from the optical axis.
TABLE 1
v coordinate 0.1 0.2 0.3 …… x
Correction factor 1 1/8 1/27 …… 1/(x/0.1)3
As another optional implementation manner, based on the relationship between the luminance correction parameter of the pixel light source and the vertical distance between the pixel light source and the optical axis of the pixel lamp, in the luminance correction parameter lookup table, a luminance correction parameter lookup table is preset, and in the luminance correction parameter lookup table, a numerical correspondence between the luminance correction parameter of the pixel light source and the vertical distance between the pixel light source and the optical axis of the pixel lamp is stored.
Then when the position of the pixel light source corresponding to the projection pixel point of the pattern to be projected is determined, the brightness correction parameter of the pixel light source corresponding to the projection pixel point can be inquired and determined from the brightness correction parameter lookup table according to the vertical distance between the pixel light source and the optical axis of the pixel lamp.
Illustratively, the embodiment of the present application further discloses that the controlling, according to the projection brightness value of each projection pixel point and the brightness correction parameter of the pixel light source corresponding to each projection pixel point, the lighting of the pixel light source corresponding to each projection pixel point includes:
firstly, according to the projection brightness value of each projection pixel point and the brightness correction parameter of the pixel light source corresponding to each projection pixel point, the light-emitting brightness value of the pixel light source corresponding to each projection pixel point is respectively determined.
And then, controlling the pixel light source corresponding to each projection pixel point to be lightened according to the light-emitting brightness value of the pixel light source corresponding to each projection pixel point.
Specifically, for a certain projection pixel, the projection brightness value is multiplied by the brightness correction parameter of the pixel light source corresponding to the projection pixel, and the obtained product is used as the light-emitting brightness value of the pixel light source corresponding to the projection pixel.
Then, the lighting of each pixel light source is controlled, and the luminance at the time of lighting thereof is controlled to be the light emission luminance value thereof, that is, the pixel light sources are controlled to be lit up in accordance with the light emission luminance value calculated therefor.
Another embodiment of the present application further discloses that the determining the position of the pixel light source corresponding to each projection pixel point respectively includes:
and respectively determining the positions of the pixel light sources corresponding to the projection pixel points on the light type negative film of the pixel lamp according to the position coordinates of the projection pixel points on the projection plane of the pixel lamp and the imaging rule of the pixel lamp.
Specifically, the following processing is respectively executed corresponding to the position coordinates of each projection pixel point on the projection plane of the pixel lamp:
firstly, according to the position coordinates of the projection pixel point on the projection plane of the pixel lamp, the imaging rule of the pixel lamp and the focal length of a lens group of the pixel lamp, calculating and determining the horizontal distance between a pixel light source corresponding to the projection pixel point and the optical axis of the pixel lamp;
and calculating and determining the vertical distance between the pixel light source corresponding to the projection pixel point and the optical axis of the pixel lamp according to the position coordinate of the projection pixel point on the projection plane of the pixel lamp, the imaging rule of the pixel lamp, the focal length of a lens group of the pixel lamp and the vertical distance between the optical axis of the pixel lamp and the projection plane of the pixel lamp.
Specifically, the following can be derived and determined according to formula (1) and formula (2) in the above embodiments of the present application:
Figure BDA0002421668130000141
i.e. according to the X-axis direction coordinates dist of the projection pixel points in the projection plane of the pixel lampa'The focal length f of the lens group of the pixel lamp and the vertical distance h between the optical axis of the pixel lamp and the projection plane of the pixel lamp are combined with the imaging rule of the pixel lamp shown in the formula (1), so that the vertical distance v between the pixel light source corresponding to the projection pixel point and the optical axis of the pixel lamp can be calculated.
Meanwhile, according to the above formula (2), it is possible to derive the determination:
Figure BDA0002421668130000142
that is, the position coordinates (dist) of the projection pixel point on the projection plane of the pixel lampa',posya') The horizontal distance u between the pixel light source corresponding to the projection pixel point and the optical axis of the pixel lamp can be calculated and determined according to the imaging rule of the pixel lamp and the focal length f of the lens group of the pixel lamp.
At this time, the position of the pixel light source corresponding to the projection pixel point on the light type negative film of the pixel lamp can be determined according to the horizontal distance u between the pixel light source corresponding to the projection pixel point and the optical axis of the pixel lamp and the vertical distance v between the pixel light source corresponding to the projection pixel point and the optical axis of the pixel lamp.
In the above embodiments of the present application, a pixel lamp projection scene with the same brightness of each part of an image to be projected is taken as an example, and a processing procedure for controlling the luminous flux of the pixel lamp pixel light source according to the brightness distribution of the pattern to be projected, which is provided by the embodiments of the present application, is described. Based on the idea of the embodiment of the present application, the brightness of the pixel light source can be adjusted and controlled with reference to the technical solution of the embodiment of the present application for any brightness of the pattern to be projected.
For example, assuming that the luminance distribution of the pattern to be projected is as shown in fig. 7, referring to the technical solution of the embodiment of the present application, the target light intensity values of the pixel light sources corresponding to the projection pixel points on the light type negative film are calculated first, that is, the target light intensity values of the projection pixel points are calculated. Then, the target light intensity value is multiplied by the brightness correction coefficient corresponding to the pixel light source to obtain a light flux ratio of the pixel light source, and the light flux of the pixel light source is controlled according to the light flux ratio, so that the light flux distribution diagram of the pixel light source shown in fig. 8 can be obtained. The corresponding relationship among the pixel light source position, the pixel light source brightness correction coefficient and the pixel light source luminous flux ratio in the above process is shown in table 2, and can be determined through table 2, and the adjustment of the pixel light luminous flux by the corresponding relationship accords with the technical scheme idea of the embodiment of the application.
TABLE 2
v coordinate 0.1 0.2 0.3 0.4 …… x ……
Target light intensity lux 0 0 200 150 …… 80 ……
Light flux ratio 0 0 200/27 150/64 …… 80/(x/0.1)3 ……
Another embodiment of the present application further provides a pixel lamp brightness control apparatus, as shown in fig. 9, the apparatus including:
a data obtaining unit 100, configured to respectively determine a projection brightness value of each projection pixel point in the pattern to be projected, and respectively determine a position of a pixel light source corresponding to each projection pixel point;
the parameter calculation unit 110 is configured to determine, according to a relationship between projection light intensity of a pixel light source of a pixel lamp and a position of the pixel light source, and a position of the pixel light source corresponding to each projection pixel point, a brightness correction parameter of the pixel light source corresponding to each projection pixel point respectively;
and a brightness control unit 120, configured to control the pixel light source corresponding to each projection pixel point to be turned on according to the projection brightness value of each projection pixel point and a brightness correction parameter of the pixel light source corresponding to each projection pixel point.
Optionally, another embodiment of the present application discloses that the relationship between the projection light intensity of the pixel light source and the position of the pixel light source includes a positive correlation between the projection light intensity of the pixel light source and a vertical distance from the pixel light source to an optical axis of the pixel light.
Optionally, in another embodiment of the present application, it is disclosed that, when the parameter calculating unit 110 determines the brightness correction parameters of the pixel light sources corresponding to each projection pixel point according to the relationship between the projection light intensity of the pixel light source of the pixel lamp and the position of the pixel light source corresponding to each projection pixel point, the parameter calculating unit is specifically configured to:
respectively determining the brightness correction parameters of the pixel light sources corresponding to each projection pixel point according to the positive correlation relationship between the vertical distance between the pixel light source of the pixel lamp and the optical axis of the pixel lamp and the projection light intensity of the pixel light source and the vertical distance between the pixel light source corresponding to each projection pixel point and the optical axis of the pixel lamp;
and the value of the brightness correction parameter of the pixel light source corresponding to each projection pixel point and the vertical distance between the pixel light source corresponding to each projection pixel point and the optical axis of the pixel lamp form a negative correlation relationship.
Optionally, in another embodiment of the present application, it is disclosed that, when the parameter calculating unit 110 respectively determines the brightness correction parameters of the pixel light sources corresponding to each projection pixel point, the parameters are specifically configured to:
and respectively determining the brightness correction parameters of the pixel light sources corresponding to each projection pixel point according to the rule that the brightness correction parameters of the pixel light sources and the third power of the vertical distance between the pixel light sources and the optical axis of the pixel lamp are in inverse proportion.
Optionally, in another embodiment of the present application, it is disclosed that the determining, by the parameter calculating unit 110, luminance correction parameters of the pixel light sources corresponding to each projection pixel point respectively includes:
inquiring and determining the brightness correction parameters of the pixel light sources corresponding to each projection pixel point from a preset brightness correction parameter lookup table;
the brightness correction parameter lookup table comprises a numerical value corresponding relation between the brightness correction parameter and the vertical distance between the pixel light source and the optical axis of the pixel lamp.
Optionally, in another embodiment of the present application, it is disclosed that, when the brightness control unit 120 controls the pixel light source corresponding to each projection pixel point to be turned on according to the projection brightness value of each projection pixel point and the brightness correction parameter of the pixel light source corresponding to each projection pixel point, the brightness control unit is specifically configured to:
respectively determining the light-emitting brightness value of the pixel light source corresponding to each projection pixel point according to the projection brightness value of each projection pixel point and the brightness correction parameter of the pixel light source corresponding to each projection pixel point;
and controlling the pixel light source corresponding to each projection pixel point to be lightened according to the light-emitting brightness value of the pixel light source corresponding to each projection pixel point.
Optionally, in another embodiment of the present application, it is disclosed that, when the data obtaining unit 100 determines the positions of the pixel light sources corresponding to each projection pixel point, specifically, the data obtaining unit is configured to:
and respectively determining the positions of the pixel light sources corresponding to the projection pixel points on the light type negative film of the pixel lamp according to the position coordinates of the projection pixel points on the projection plane of the pixel lamp and the imaging rule of the pixel lamp.
Specifically, please refer to the contents of the above method embodiments for the specific working contents of each unit in each embodiment of the pixel lamp brightness control apparatus, which is not described herein again.
While, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present application is not limited by the order of acts or acts described, as some steps may occur in other orders or concurrently with other steps in accordance with the application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device-like embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The steps in the method of the embodiments of the present application may be sequentially adjusted, combined, and deleted according to actual needs.
The modules and sub-modules in the device and the terminal in the embodiments of the application can be combined, divided and deleted according to actual needs.
In the several embodiments provided in the present application, it should be understood that the disclosed terminal, apparatus and method may be implemented in other manners. For example, the above-described terminal embodiments are merely illustrative, and for example, the division of a module or a sub-module is only one logical division, and there may be other divisions when the terminal is actually implemented, for example, a plurality of sub-modules or modules may be combined or integrated into another module, or some features may be omitted or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.
The modules or sub-modules described as separate components may or may not be physically separate, and the components described as modules or sub-modules may or may not be physical modules or sub-modules, may be located in one place, or may be distributed on a plurality of network modules or sub-modules. Some or all of the modules or sub-modules can be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
In addition, each functional module or sub-module in the embodiments of the present application may be integrated into one processing module, or each module or sub-module may exist alone physically, or two or more modules or sub-modules may be integrated into one module. The integrated modules or sub-modules may be implemented in the form of hardware, or may be implemented in the form of software functional modules or sub-modules.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the components and steps of the various examples have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software unit executed by a processor, or in a combination of the two. The software cells may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A method for controlling brightness of a pixel lamp, comprising:
respectively determining the projection brightness value of each projection pixel point in the pattern to be projected, and respectively determining the position of a pixel light source corresponding to each projection pixel point;
projecting light intensity and image according to pixel light source of pixel lampDetermining brightness correction parameters of the pixel light sources corresponding to each projection pixel point respectively according to the relationship of the pixel light source positions and the positions of the pixel light sources corresponding to each projection pixel point; wherein the pixel light source position (u, v) corresponds to a projection pixel (dist) on a projection planea',posya') The imaging rule satisfied is as follows:
Figure FDA0003470688210000011
Figure FDA0003470688210000012
f is the focal length of the lens group, and h is the vertical distance between the center point of the lens group of the pixel lamp and the projection plane of the pixel lamp;
and controlling the pixel light source corresponding to each projection pixel point to be turned on according to the projection brightness value of each projection pixel point and the brightness correction parameter of the pixel light source corresponding to each projection pixel point.
2. The method of claim 1, wherein the relationship between the projected light intensity of the pixel light source and the position of the pixel light source comprises a positive relationship between the projected light intensity of the pixel light source and a vertical distance from the pixel light source to an optical axis of the pixel light.
3. The method according to claim 2, wherein the determining the brightness correction parameters of the pixel light sources corresponding to each projection pixel point respectively according to the relationship between the projection light intensity of the pixel light sources of the pixel lamp and the position of the pixel light sources corresponding to each projection pixel point comprises:
according to the positive correlation relationship between the vertical distance between each pixel light source of the pixel lamp and the optical axis of the pixel lamp and the projection light intensity of the pixel light source, respectively determining the brightness correction parameters of the pixel light sources in one-to-one correspondence relationship with each projection pixel point by combining the vertical distance between the pixel light source corresponding to each projection pixel point and the optical axis of the pixel lamp;
and the value of the brightness correction parameter of the pixel light source corresponding to each projection pixel point and the vertical distance between the pixel light source corresponding to each projection pixel point and the optical axis of the pixel lamp form a negative correlation relationship.
4. The method of claim 3, wherein said separately determining the brightness correction parameters for the pixel light source corresponding to said each projected pixel point comprises:
and respectively determining the brightness correction parameters of the pixel light sources corresponding to each projection pixel point according to the rule that the brightness correction parameters of the pixel light sources and the third power of the vertical distance between the pixel light sources and the optical axis of the pixel lamp are in inverse proportion.
5. The method of claim 3, wherein said separately determining the brightness correction parameters for the pixel light source corresponding to said each projected pixel point comprises:
inquiring and determining the brightness correction parameters of the pixel light sources corresponding to each projection pixel point from a preset brightness correction parameter lookup table;
the brightness correction parameter lookup table comprises a numerical value corresponding relation between the brightness correction parameter and the vertical distance between the pixel light source and the optical axis of the pixel lamp.
6. The method according to claim 1, wherein said controlling the illumination of the pixel light source corresponding to each projection pixel point according to the projection brightness value of each projection pixel point and the brightness correction parameter of the pixel light source corresponding to each projection pixel point comprises:
respectively determining the light-emitting brightness value of the pixel light source corresponding to each projection pixel point according to the projection brightness value of each projection pixel point and the brightness correction parameter of the pixel light source corresponding to each projection pixel point;
and controlling the pixel light source corresponding to each projection pixel point to be lightened according to the light-emitting brightness value of the pixel light source corresponding to each projection pixel point.
7. The method of claim 1, wherein said separately determining the location of the pixel light source corresponding to said each projected pixel point comprises:
and respectively determining the positions of the pixel light sources corresponding to the projection pixel points on the light type negative film of the pixel lamp according to the position coordinates of the projection pixel points on the projection plane of the pixel lamp and the imaging rule of the pixel lamp.
8. A pixel lamp luminance control apparatus, comprising:
the data acquisition unit is used for respectively determining the projection brightness value of each projection pixel point in the pattern to be projected and respectively determining the position of the pixel light source corresponding to each projection pixel point;
the parameter calculation unit is used for respectively determining the brightness correction parameters of the pixel light sources corresponding to the projection pixel points according to the relationship between the projection light intensity of the pixel light sources of the pixel lamps and the positions of the pixel light sources corresponding to the projection pixel points; wherein the pixel light source position (u, v) corresponds to a projection pixel (dist) on a projection planea',posya') The imaging rule satisfied is as follows:
Figure FDA0003470688210000031
Figure FDA0003470688210000032
f is the focal length of the lens group, and h is the vertical distance between the center point of the lens group of the pixel lamp and the projection plane of the pixel lamp;
and the brightness control unit is used for controlling the pixel light source corresponding to each projection pixel point to be lightened according to the projection brightness value of each projection pixel point and the brightness correction parameter of the pixel light source corresponding to each projection pixel point.
9. The apparatus of claim 8, wherein the relationship between the projected light intensity of the pixel light source and the position of the pixel light source comprises a positive relationship between the projected light intensity of the pixel light source and a vertical distance between the pixel light source and an optical axis of the pixel light.
10. The apparatus according to claim 9, wherein the parameter calculating unit is specifically configured to, when determining the luminance correction parameter of the pixel light source corresponding to each projection pixel point according to a relationship between the projection light intensity of the pixel light source of the pixel lamp and the position of the pixel light source, and the position of the pixel light source corresponding to each projection pixel point, respectively:
according to the positive correlation relationship between the vertical distance between each pixel light source of the pixel lamp and the optical axis of the pixel lamp and the projection light intensity of the pixel light source, respectively determining the brightness correction parameters of the pixel light sources in one-to-one correspondence relationship with each projection pixel point by combining the vertical distance between the pixel light source corresponding to each projection pixel point and the optical axis of the pixel lamp;
and the value of the brightness correction parameter of the pixel light source corresponding to each projection pixel point and the vertical distance between the pixel light source corresponding to each projection pixel point and the optical axis of the pixel lamp form a negative correlation relationship.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101510962A (en) * 2008-12-31 2009-08-19 昆山锐芯微电子有限公司 Method and apparatus for correcting lens shadow
CN109360229A (en) * 2018-10-31 2019-02-19 歌尔股份有限公司 Laser projection image processing method, device and equipment

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102854724B (en) * 2012-08-30 2014-11-05 深圳市绎立锐光科技开发有限公司 Adjustment method and device of projection light source
CN107247384B (en) * 2017-07-31 2020-07-03 歌尔股份有限公司 Brightness compensation data acquisition system and method, image brightness adjustment method and device
CN108510956B (en) * 2018-05-02 2020-01-07 京东方科技集团股份有限公司 Image display brightness adjusting method and device of display panel and display device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101510962A (en) * 2008-12-31 2009-08-19 昆山锐芯微电子有限公司 Method and apparatus for correcting lens shadow
CN109360229A (en) * 2018-10-31 2019-02-19 歌尔股份有限公司 Laser projection image processing method, device and equipment

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