CN114155802A - Laser projection display method, laser projection device and readable storage medium - Google Patents
Laser projection display method, laser projection device and readable storage medium Download PDFInfo
- Publication number
- CN114155802A CN114155802A CN202111436976.XA CN202111436976A CN114155802A CN 114155802 A CN114155802 A CN 114155802A CN 202111436976 A CN202111436976 A CN 202111436976A CN 114155802 A CN114155802 A CN 114155802A
- Authority
- CN
- China
- Prior art keywords
- projection
- screen
- projection screen
- reference brightness
- currently selected
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000013507 mapping Methods 0.000 claims abstract description 44
- 230000008859 change Effects 0.000 claims description 9
- 238000003384 imaging method Methods 0.000 claims description 5
- 238000012546 transfer Methods 0.000 claims description 2
- 230000000875 corresponding effect Effects 0.000 claims 14
- 230000002596 correlated effect Effects 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 8
- 235000019557 luminance Nutrition 0.000 description 28
- 239000003086 colorant Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Controls And Circuits For Display Device (AREA)
Abstract
The invention discloses a laser projection display method, laser projection equipment and a readable storage medium. For the problem that dark field details of a displayed picture are lost or highlight saturation is caused by different screen gains of different projection screens, when a control signal that a user selects the projection screen is received, the model of the currently selected projection screen can be obtained, and then the reference brightness corresponding to the currently selected projection screen is determined according to the corresponding relation between the model of the projection screen and the reference brightness, so that the reference brightness is adopted to carry out brightness mapping on the HDR image to be displayed, the HDR image is suitable for the currently selected projection screen, the dark field details can be displayed, the problem of highlight saturation is avoided, and the advantages of the HDR image are played.
Description
Technical Field
The present invention relates to the field of projection display technologies, and in particular, to a laser projection display method, a laser projection device, and a readable storage medium.
Background
With the popularization of laser display products, laser projection apparatuses have begun to move into thousands of households as large screen products to replace televisions, and thus the requirements on display effects such as brightness and color presentation are much higher than those of ordinary projection products.
High Dynamic Range (HDR) display can expand the brightness Range of display, show more details of bright and dark portions, and bring richer colors and more vivid and natural detailed expressions to pictures, so that the display pictures are closer to those seen by human eyes. The HDR can be matched with the laser projection device to display images in order to optimize the display effect of the laser projection device.
At present, a host and a screen of a laser projection device are separated, and in order to improve the generalization of products and different use scenes of users, one host is often matched with different screens, and the problem that dark field details are lost or highlighted and saturated occurs when the laser projection device displays images due to different gains of the screens.
Disclosure of Invention
In a first aspect of the embodiments of the present invention, a laser projection display method is provided, including:
when a control signal that a user selects a projection screen is received, determining the model of the currently selected projection screen;
determining the reference brightness corresponding to the currently selected projection screen according to the model of the currently selected projection screen and the corresponding relation between the model of the projection screen and the reference brightness which is predetermined;
and performing brightness mapping on the high dynamic range image to be displayed according to the determined reference brightness, and then performing image display.
The laser projection display method provided by the embodiment of the invention is directed to an application scene that a plurality of projection screens are matched with a laser projection device and the screen gains of the projection screens are different. For the problem that dark field details of a displayed picture are lost or highlight saturation is caused by different screen gains when different projection screens are adopted, when a control signal that a user selects a projection screen is received, the model of the currently selected projection screen can be obtained first, then the reference brightness corresponding to the currently selected projection screen is determined according to the corresponding relation between the model of the projection screen and the reference brightness, and therefore the reference brightness is adopted to carry out brightness mapping on the HDR image to be displayed, so that the HDR image is suitable for the currently selected projection screen, the dark field details can be displayed, the problem of highlight saturation is avoided, and the advantages of the HDR image are played.
In a second aspect of the embodiments of the present invention, there is provided a laser projection apparatus, including:
a laser light source for emitting laser light;
the light valve modulation component is positioned on the light emitting side of the laser light source; the light valve modulation component is used for modulating and reflecting incident light;
the projection lens is positioned on a reflection light path of the light valve modulation component; the projection lens is used for imaging emergent light of the light valve modulation component;
the projection screens are positioned on the light emergent side of the projection lens and used for displaying projection images; the screen gains of the projection screens are different;
a processor connected to the light valve modulating component; the processor is used for determining the model of the currently selected projection screen when receiving a control signal of the projection screen selected by a user; determining the reference brightness corresponding to the currently selected projection screen according to the model of the currently selected projection screen and the corresponding relation between the model of the projection screen and the reference brightness which is predetermined; and performing brightness mapping on the high dynamic range image to be displayed according to the determined reference brightness, and then performing image display.
The laser projection equipment is matched with a plurality of projection screens, the screen gains of the projection screens are different, when a control signal that a user selects the projection screen is received, the model of the currently selected projection screen can be obtained, then the reference brightness corresponding to the currently selected projection screen is determined according to the corresponding relation between the model of the projection screen and the reference brightness, and brightness mapping is carried out on the HDR image to be displayed by adopting the reference brightness, so that the HDR image to be displayed is adaptive to the currently selected projection screen, dark field details can be displayed, the problem of high brightness and saturation is avoided, and the advantages of the HDR image are played.
In a third aspect of the embodiments of the present invention, a readable storage medium is provided, where executable instructions of a laser projection device are stored, and the executable instructions of the laser projection device are configured to enable the laser projection device to execute the laser projection display method.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a laser projection apparatus according to an embodiment of the present invention;
fig. 2 is a flowchart of a laser projection display method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of one of 0-100IRE grayscale graphic cards according to an embodiment of the present invention;
FIG. 4 is a second schematic diagram of a 0-100IRE grayscale graphic card according to an embodiment of the present invention;
FIG. 5 is a third schematic diagram of a 0-100IRE grayscale graphic card according to an embodiment of the present invention.
The system comprises a laser source 10, a light valve modulation component 20, a projection lens 30, a projection screen 40 and a processor 50.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, the present invention is further described with reference to the accompanying drawings and examples. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted. The words expressing the position and direction described in the present invention are illustrated in the accompanying drawings, but may be changed as required and still be within the scope of the present invention. The drawings of the present invention are for illustrative purposes only and do not represent true scale.
With the popularization of laser display products, laser projection devices have begun to be moved to thousands of households as large screen products to replace televisions. Currently, mainstream laser projection equipment mainly comprises two display modes, one mode is that a monochromatic laser is adopted to cooperate with a color wheel to perform time-sharing display, and the other mode is that a three-color laser is adopted to perform three-primary-color display. Due to the visual inertia of human eyes, the primary colors alternately irradiated on the same pixel point at high speed are mixed and superposed to watch the color.
Laser projection devices as an alternative to televisions have much higher requirements in terms of display effects such as brightness and color rendering than the requirements of ordinary projection products. In order to achieve a better display effect, current laser projection apparatuses often cooperate with HDR technology to display images.
Fig. 1 is a schematic structural diagram of a laser projection apparatus according to an embodiment of the present invention.
As shown in fig. 1, the laser projection apparatus includes: a laser light source 10, a light valve modulation component 20, a projection lens 30, a projection screen 40 and a processor 50.
In the embodiment of the present invention, the laser light source 10 may adopt a monochromatic laser, a laser capable of emitting laser light of multiple colors, or a plurality of lasers emitting laser light of different colors. When the laser light source 10 adopts a monochromatic laser, the laser display device needs to be provided with a color wheel, the color wheel is used for color conversion, and the monochromatic laser can be matched with the color wheel to realize the purpose of emitting primary color light with different colors according to time sequence. When the laser light source 10 is a laser capable of emitting laser light of a plurality of colors, the laser light source needs to be controlled to emit laser light of different colors as primary color light in time series.
The light valve modulation unit 20 is located on the light emitting side of the laser light source 10, and the light valve modulation unit 20 is configured to modulate and reflect incident light. In an implementation, the light valve modulating component 20 may employ a Digital micro mirror Device (DMD), which is a reflective light valve Device, and the surface of the DMD includes thousands of micro mirrors. Each small mirror can be independently driven to deflect, and incident light is modulated by controlling the deflection angle of the DMD.
The projection lens 30 is located on the reflection light path of the light valve modulating section 20, and the projection lens 30 is used to form an image of the light emitted from the light valve modulating section 20. The outgoing light modulated by the light valve modulation component 20 needs to be imaged through the projection lens 30 to project an image on a projection screen or a set position, and a viewer can view a display picture by viewing the projection screen.
The projection screen 40 is located on the light-emitting side of the projection lens 30, and is used for receiving the image formed by the projection lens 30 and displaying the image. In order to meet the requirements of different use scenes or different users, a laser projection device may be generally equipped with a plurality of projection screens, and the screen gain of each projection screen is different. In general, the larger the screen gain is, the stronger the light reflection capability of the projection screen is, and the brighter the image viewed by a user at a front view angle is; the smaller the screen gain is, the weaker the reflection capability of the projection screen to light rays is, but an image can be observed at any angle of view, and the larger the viewing range of the image is. In specific application, the corresponding projection screen can be adopted for projection display according to the requirement.
The processor 50 is connected to the light valve modulating component 20 for providing driving signals to the light valve modulating component 20, and the light valve modulating component 20 drives the deflection angles of the micro mirrors according to the driving signals provided by the processor 50. In particular, the processor 50 may be a driver chip, and the driver chip may be programmed to perform corresponding operations according to a curing program.
The laser projection equipment provided by the embodiment of the invention is applied to HDR image display, the HDR image display can expand the display brightness range, show more details of bright parts and dark parts, and bring richer colors and more vivid and natural detailed expressions to pictures, so that the television pictures are closer to the human eyes.
Since the luminance range of an HDR image is usually larger than the luminance range of a display, the HDR image data needs to be luminance mapped before image display, and the luminance mapping curve needs to be matched with an Electro-Optical Transfer Function (EOTF). In general, matching can be done with the standard EOTF (ST2084) curve.
The embodiment of the present invention solidifies the program of the luminance mapping in the processor 50, and before displaying the image, the processor 50 processes the HDR image data to be displayed. At present, the processing process of the image data of the processor 50 is performed according to the default brightness parameter, however, when the processing method is applied to the laser projection apparatus provided by the embodiment of the present invention, since the screen gains of the projection screens are not equal, when the brightness mapping is performed by using the standard brightness parameter, the brightness mapping cannot be matched with the standard EOTF curve, so that the problem of dark field detail loss or high brightness saturation is caused, and the advantage of HDR display cannot be exerted.
In view of this, embodiments of the present invention provide a laser projection display method, which can automatically perform brightness mapping according to screen gains of different projection screens, so as to optimize a display effect.
Fig. 2 is a flowchart of a laser projection display method according to an embodiment of the present invention.
As shown in fig. 2, the laser projection display method includes:
s10, when a control signal that a user selects a projection screen is received, determining the model of the currently selected projection screen;
s20, determining the reference brightness corresponding to the currently selected projection screen according to the model of the currently selected projection screen and the corresponding relation between the model of the projection screen and the reference brightness which is predetermined;
and S30, performing brightness mapping on the high dynamic range image to be displayed according to the determined reference brightness, and then performing image display.
The laser projection display method provided by the embodiment of the invention is directed to an application scene that a plurality of projection screens are matched with a laser projection device and the screen gains of the projection screens are different. For the problem that dark field details of a displayed picture are lost or highlight saturation is caused by different screen gains when different projection screens are adopted, when a control signal that a user selects a projection screen is received, the model of the currently selected projection screen can be obtained first, then the reference brightness corresponding to the currently selected projection screen is determined according to the corresponding relation between the model of the projection screen and the reference brightness, and therefore the reference brightness is adopted to carry out brightness mapping on the HDR image to be displayed, so that the HDR image is suitable for the currently selected projection screen, the dark field details can be displayed, the problem of highlight saturation is avoided, and the advantages of the HDR image are played.
In specific implementation, the preset program in the processor 50 performs brightness mapping on the input HDR data according to the relevant parameters of the default projection screen so as to match the brightness variation trend after brightness mapping with the standard EOTF curve. In the embodiment of the present invention, brightness mapping needs to be performed according to a reference brightness value, where the reference brightness may reflect the overall brightness of the laser projection device, and the brightness of the image displayed after brightness mapping according to the reference brightness does not exceed the brightness range of the laser projection device, so as to achieve the best display effect.
In some embodiments, the reference brightness may be a maximum display brightness of the laser projection device, and when performing brightness mapping, the maximum brightness in the HDR image may be corresponding to the maximum brightness of the laser projection device, and according to a correspondence relationship of the maximum brightness, brightness mapping may be performed on other brightness values to optimize a display effect.
Fig. 3 is a schematic diagram of one of 0-100IRE gray scale cards provided by the embodiment of the present invention, fig. 4 is a schematic diagram of a second 0-100IRE gray scale card provided by the embodiment of the present invention, and fig. 5 is a schematic diagram of a third 0-100IRE gray scale card provided by the embodiment of the present invention. Wherein the abscissa represents 0-100IRE gray levels and the ordinate represents luminance. s represents a standard EOTF curve, and s1 represents a luminance change trend curve after luminance mapping.
In the embodiment of the invention, the laser projection device is provided with a plurality of projection screens, the screen gain of each projection screen is different, when the default projection screen is adopted for image display, the maximum brightness of the laser projection device is a fixed value, and the maximum brightness when the laser projection device adopts the default projection screen for image display is called as default reference brightness and is also a default value in the system. When the default projection screen is used to display an image, and the pre-cured program of the processor 50 performs luminance mapping on the HDR image according to the default reference luminance, as shown in fig. 3, the luminance variation trend curve s1 substantially coincides with the standard EOTF curve s, so that the dark details of the image can be represented, the problem of highlight saturation is not caused, and the display effect is good.
However, if the HDR image is still luminance-mapped according to the default reference luminance when the projection screen is replaced so that the screen gain of the currently selected projection screen is smaller than the screen gain of the default projection screen, as shown in fig. 4, the luminance change trend curve s1 after luminance mapping does not match the standard EOTF curve s, so that higher luminance is displayed at the same gray level, thereby causing a problem of high luminance saturation.
On the contrary, if the screen gain of the currently selected projection screen is larger than the screen gain of the default projection screen when the projection screen is replaced, and if the HDR image is still luminance mapped according to the default reference luminance, as shown in fig. 5, the luminance change trend curve s1 after luminance mapping also has a mismatch problem with the standard EOTF curve s, so that lower luminance is displayed at the same gray level, thereby causing a problem that dark field details disappear.
In order to overcome the above problems, in the embodiment of the present invention, when a user selects a projection screen, the reference brightness of the currently selected projection screen is automatically obtained, so that brightness mapping is performed according to the determined reference brightness, and a brightness change trend curve after brightness mapping can be matched with a standard EOTF curve. And when the user does not switch other projection screens, namely when the control signal of the screen selected by the user is not received, the image display is carried out after the brightness mapping is carried out on the high dynamic range image to be displayed according to the default reference brightness corresponding to the default projection screen.
Specifically, in the embodiment of the present invention, the correspondence between the model of the projection screen and the reference luminance is determined based on the screen gain of the projection screen.
The models of the different projection screens respectively correspond to a screen gain, and the screen gain of the default projection screen is the default screen gain. The corresponding relationship among the projection screens, the models and the screen gains satisfies the following table:
| model of screen | Screen gain |
| S_default | G_default |
| S1 | G1 |
| S2 | G2 |
| S3 | G3 |
| ...... | ..... |
| Sn | Gn |
Wherein S _ default represents the model of the default projection screen, and S1-Sn represent the models of n projection screens except the default projection screen; g _ default represents the screen gain of the default projection screen, and G1-Gn represent the screen gains of n projection screens other than the projection screen. n is a positive integer greater than or equal to 1.
As can be seen from the above table, different projection screens correspond to different models of projection screens, and the screen gains corresponding to the projection screens of different models are different.
Further, according to multiple experimental attempts, when the projection screens with different screen gains are used for image display, different reference luminances can be used for the attempts, so that the reference luminances corresponding to the different screen gains are determined, and after the projection screens with the corresponding models are subjected to luminance mapping according to the corresponding reference luminances, the luminance change trend curve of the projection screens with the corresponding models is matched with the standard EOTF curve.
The following table shows the correspondence between different screen gains and reference luminances obtained in the embodiment of the present invention:
| screen gain | Brightness of screen |
| G_default | B_default |
| G1 | B1 |
| G2 | B2 |
| G3 | B3 |
| ...... | ...... |
| Gn | Bn |
Wherein, G _ default represents the screen gain of the default projection screen, and G1-Gn represent the screen gains of n projection screens except the projection screen; b _ default represents the default reference brightness corresponding to the screen gain of the default projection screen, and B1-Bn represent the reference brightness corresponding to the n screen gains of the n projection screens except the screen gain of the default projection screen. n is a positive integer greater than or equal to 1.
The correspondence of the above table is obtained through a plurality of experimental tests, and after the HDR image displayed by the corresponding projection screen is subjected to brightness mapping by using the reference brightness corresponding to the above table, the correspondence can be matched with the EOTF curve, so that the image quality experience is improved.
In specific implementation, after the model of the currently selected projection screen is obtained, the screen gain corresponding to the currently selected projection screen is determined according to the model of the currently selected projection screen and the corresponding relationship between the model of the projection screen and the screen gain, which is predetermined; and determining the reference brightness corresponding to the currently selected projection screen according to the screen gain corresponding to the currently selected projection screen and the corresponding relation between the screen gain and the reference brightness, so as to obtain the reference brightness suitable for performing brightness mapping on the currently selected projection screen, and matching the brightness change trend after the brightness mapping is performed according to the reference brightness with the standard EOTF curve.
Multiple experiments prove that the reference brightness and the screen gain in the embodiment of the invention are in a positive correlation relationship. When the screen gain is increased, the reference brightness corresponding to the projection screen is correspondingly increased; when the screen gain is reduced, the reference brightness corresponding to the projection screen is correspondingly reduced. The method is matched with the rule of actual image display, when the projection screen with larger screen gain is adopted, the projection screen has stronger light reflection capability, so that more light rays can be received by human eyes, the image is reflected to be brighter, the brightness of the displayed image is higher, and the current maximum brightness is correspondingly increased; when a projection screen with smaller screen gain is adopted, the projection screen has weaker capability of reflecting light, so that the light rays which can be received by human eyes are less, the image is reflected to be darker, the brightness of the displayed image is lower at the moment, and the maximum brightness at the moment is correspondingly reduced.
Specifically, the correspondence between the reference brightness and the screen gain may satisfy a linear relationship, and according to multiple experimental simulations, the correspondence between the screen gain and the reference brightness may substantially satisfy the linear relationship, so that the reference brightness corresponding to the currently selected projection screen may be determined by using the following formula:
wherein Bn is a reference brightness corresponding to the currently selected projection screen, B _ default is a default reference brightness corresponding to the default projection screen, and Gn is a screen gain of the default projection screen.
The screen gain of the currently selected projection screen can be obtained according to the corresponding relation between the model of the projection screen and the screen gain, and the screen gain of the default projection screen and the default reference brightness are known values, so that the reference brightness corresponding to the currently selected projection screen can be calculated according to the formula.
For example, when the default reference brightness of the default projection screen is 300nit and the screen gain G of the currently selected projection screen is 0.4G _ default, the reference brightness of the currently selected projection screen is 0.4 × 300nit 120 nit. When 120nit is input to the processor 50 as a reference brightness value, the processor 50 performs brightness mapping according to the reference brightness value, and then the brightness variation trend curve can be matched with the standard EOTF curve (as shown in fig. 3), so as to avoid the problem of highlight saturation when displaying an image.
When the default reference brightness of the default projection screen is 300nit and the screen gain G of the currently selected projection screen is 1.5G _ default, the reference brightness of the currently selected projection screen is 1.5 × 300nit is 450 nit. When 450nit is input to the processor 50 as a reference brightness value, the processor 50 performs brightness mapping according to the reference brightness value, and then the brightness variation trend curve can be matched with the standard EOTF curve (as shown in fig. 3), so as to avoid the problem that dark field details disappear when the image is displayed.
Another aspect of the embodiments of the present invention provides a laser projection apparatus, where the structure of the laser projection apparatus may be as shown in fig. 1, and specifically includes: a laser light source 10, a light valve modulation component 20, a projection lens 30, a projection screen 40 and a processor 50.
The laser light source 10 emits laser light of different colors at a set timing. The light valve modulation unit 20 is located on the light emitting side of the laser light source 10, and the light valve modulation unit 20 is configured to modulate and reflect incident light. In the embodiment of the present invention, the light valve modulating unit 20 may employ a DMD. The projection lens 30 is located on the reflection light path of the light valve modulation component 20, the projection lens 30 is used for imaging the emergent light of the light valve modulation component, and the projection screen 40 is located on the light emergent side of the projection lens 30 and used for receiving the imaging of the projection lens 30. The processor 50 is connected to the light valve modulating component 20; the processor 50 is used for determining the model of the currently selected projection screen when receiving a control signal of the projection screen selected by a user; determining the reference brightness corresponding to the currently selected projection screen according to the model of the currently selected projection screen and the corresponding relation between the model of the projection screen and the reference brightness which is predetermined; and performing brightness mapping on the high dynamic range image to be displayed according to the determined reference brightness, and then performing image display.
The laser projection equipment provided by the embodiment of the invention is matched with a plurality of projection screens, and the screen gains of the projection screens are different. For the problem that dark field details of a displayed picture are lost or highlight saturation is caused by different screen gains when different projection screens are adopted, when a control signal that a user selects a projection screen is received, the model of the currently selected projection screen can be obtained first, then the reference brightness corresponding to the currently selected projection screen is determined according to the corresponding relation between the model of the projection screen and the reference brightness, and therefore the reference brightness is adopted to carry out brightness mapping on the HDR image to be displayed, so that the HDR image is suitable for the currently selected projection screen, the dark field details can be displayed, the problem of highlight saturation is avoided, and the advantages of the HDR image are played.
Specifically, the processor 50 is specifically configured to determine a screen gain corresponding to the currently selected projection screen according to the model of the currently selected projection screen and a predetermined correspondence between the model of the projection screen and the screen gain; and determining the reference brightness corresponding to the currently selected projection screen according to the screen gain corresponding to the currently selected projection screen and the corresponding relation between the screen gain and the reference brightness.
After the reference brightness corresponding to the currently selected projection screen is determined, the brightness change trend can be matched with the standard EOTF curve after the brightness mapping is carried out according to the reference brightness, so that the problem of dark field detail loss or highlight saturation is avoided.
The screen gain of the projection screen and the reference brightness satisfy a positive correlation, specifically a linear correlation, so that the reference brightness corresponding to the currently selected projection screen can be determined according to a proportional relationship between the screen gain of the currently selected projection screen and the screen gain of the default projection screen.
The embodiment of the invention also provides a readable storage medium, wherein the readable storage medium stores an executable instruction of the laser projection equipment, and the executable instruction of the laser projection equipment is used for enabling the laser projection equipment to execute any one of the laser projection display methods.
According to the first invention, the laser projection apparatus is provided with a plurality of projection screens, and the screen gains of the projection screens are different. For the problem that dark field details of a displayed picture are lost or highlight saturation is caused by different screen gains of different projection screens, when a control signal that a user selects the projection screen is received, the model of the currently selected projection screen can be obtained, and then the reference brightness corresponding to the currently selected projection screen is determined according to the corresponding relation between the model of the projection screen and the reference brightness, so that the reference brightness is adopted to carry out brightness mapping on the HDR image to be displayed, the HDR image is suitable for the currently selected projection screen, the dark field details can be displayed, the problem of highlight saturation is avoided, and the advantages of the HDR image are played.
According to the second inventive concept, after the model of the currently selected projection screen is obtained, the screen gain corresponding to the currently selected projection screen is determined according to the model of the currently selected projection screen and the corresponding relationship between the model of the projection screen and the screen gain which is predetermined; and determining the reference brightness corresponding to the currently selected projection screen according to the screen gain corresponding to the currently selected projection screen and the corresponding relation between the screen gain and the reference brightness, so as to obtain the reference brightness suitable for performing brightness mapping on the currently selected projection screen, and matching the brightness change trend after the brightness mapping is performed according to the reference brightness with the standard EOTF curve.
According to the third inventive concept, multiple experiments prove that the reference brightness and the screen gain are in a positive correlation relationship. When the screen gain is increased, the reference brightness corresponding to the projection screen is correspondingly increased; when the screen gain is reduced, the reference brightness corresponding to the projection screen is correspondingly reduced. The method is matched with the rule of actual image display, when the projection screen with larger screen gain is adopted, the projection screen has stronger light reflection capability, so that more light rays can be received by human eyes, the image is reflected to be brighter, the brightness of the displayed image is higher, and the current maximum brightness is correspondingly increased; when a projection screen with smaller screen gain is adopted, the projection screen has weaker capability of reflecting light, so that the light rays which can be received by human eyes are less, the image is reflected to be darker, the brightness of the displayed image is lower at the moment, and the maximum brightness at the moment is correspondingly reduced.
According to the fourth inventive concept, the correspondence between the reference brightness and the screen gain may satisfy a linear relationship, and according to multiple experimental simulations, it may be obtained that the correspondence between the screen gain and the reference brightness substantially satisfies the linear relationship, and then, the reference brightness corresponding to the currently selected projection screen may be determined by using the following formula:
wherein Bn is a reference brightness corresponding to the currently selected projection screen, B _ default is a default reference brightness corresponding to the default projection screen, and Gn is a screen gain of the default projection screen.
The screen gain of the currently selected projection screen can be obtained according to the corresponding relation between the model of the projection screen and the screen gain, and the screen gain of the default projection screen and the default reference brightness are known values, so that the reference brightness corresponding to the currently selected projection screen can be calculated according to the formula.
According to a fifth inventive concept, a laser projection apparatus includes: the device comprises a laser light source, a light valve modulation component, a projection lens, a projection screen and a processor.
The laser light source is used for emitting laser light with different colors according to a set time sequence. The light valve modulation component is positioned on the light emitting side of the laser light source and used for modulating and reflecting incident light. The projection lens is positioned on a reflection light path of the light valve modulation component and is used for imaging emergent light of the light valve modulation component. The projection screen is located on the light-emitting side of the projection lens and used for receiving the image of the projection lens. The processor is connected with the light valve modulation component; the processor is used for determining the model of the currently selected projection screen when receiving a control signal of the projection screen selected by a user; determining the reference brightness corresponding to the currently selected projection screen according to the model of the currently selected projection screen and the corresponding relation between the model of the projection screen and the reference brightness which is predetermined; and performing brightness mapping on the high dynamic range image to be displayed according to the determined reference brightness, and then performing image display.
According to the sixth inventive concept, the processor is specifically configured to determine a screen gain corresponding to the currently selected projection screen according to the model of the currently selected projection screen and a predetermined correspondence between the model of the projection screen and the screen gain; and determining the reference brightness corresponding to the currently selected projection screen according to the screen gain corresponding to the currently selected projection screen and the corresponding relation between the screen gain and the reference brightness.
According to a seventh inventive concept, the readable storage medium stores executable instructions of the laser projection apparatus, and the executable instructions of the laser projection apparatus are configured to cause the laser projection apparatus to perform any one of the laser projection display methods described above.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A laser projection display method, wherein a laser projection apparatus includes a plurality of projection screens, and screen gains of the respective projection screens are different, the method comprising:
when a control signal that a user selects a projection screen is received, determining the model of the currently selected projection screen;
determining the reference brightness corresponding to the currently selected projection screen according to the model of the currently selected projection screen and the corresponding relation between the model of the projection screen and the reference brightness which is predetermined;
and performing brightness mapping on the high dynamic range image to be displayed according to the determined reference brightness, and then performing image display.
2. The method of claim 1, wherein determining the reference brightness corresponding to the selected projection screen according to the model of the currently selected projection screen and a predetermined correspondence between the model of the projection screen and the reference brightness comprises:
determining the screen gain corresponding to the currently selected projection screen according to the model of the currently selected projection screen and the corresponding relation between the model of the projection screen and the screen gain, which is predetermined;
and determining the reference brightness corresponding to the currently selected projection screen according to the screen gain corresponding to the currently selected projection screen and the corresponding relation between the screen gain and the reference brightness.
3. The method of claim 2, wherein the plurality of projection screens includes a default projection screen and at least one non-default projection screen, the method further comprising:
and when the control signal that the user selects the projection screen is not received, performing brightness mapping on the high dynamic range image to be displayed according to the default reference brightness corresponding to the default projection screen, and then displaying the image.
4. The method according to any one of claims 1-3, wherein said luminance mapping the high dynamic range image to be displayed according to the determined reference luminance comprises:
and performing brightness mapping on the high dynamic range image to be displayed according to the determined reference brightness so as to enable the brightness change trend after the brightness mapping to be matched with a standard electro-optic transfer function curve.
5. The method of claim 3, wherein the screen gain is positively correlated with the reference brightness.
6. The method of claim 5, wherein the screen gain is linear with respect to the reference brightness.
7. The method of claim 6, wherein the reference brightness corresponding to the currently selected projection screen is determined using the following formula:
wherein Bn is a reference brightness corresponding to the currently selected projection screen, B _ default is a default reference brightness corresponding to the default projection screen, and Gn is a screen gain of the default projection screen.
8. The method of any of claims 1-3, wherein the reference brightness is a maximum brightness of the laser projection device.
9. A laser projection device, comprising:
a laser light source for emitting laser light;
the light valve modulation component is positioned on the light emitting side of the laser light source; the light valve modulation component is used for modulating and reflecting incident light;
the projection lens is positioned on a reflection light path of the light valve modulation component; the projection lens is used for imaging emergent light of the light valve modulation component;
the projection screens are positioned on the light emergent side of the projection lens and used for displaying projection images; the screen gains of the projection screens are different;
a processor connected to the light valve modulating component; the processor is used for determining the model of the currently selected projection screen when receiving a control signal of the projection screen selected by a user; determining the reference brightness corresponding to the currently selected projection screen according to the model of the currently selected projection screen and the corresponding relation between the model of the projection screen and the reference brightness which is predetermined; and performing brightness mapping on the high dynamic range image to be displayed according to the determined reference brightness, and then performing image display.
10. A readable storage medium storing executable instructions of a laser projection device, the executable instructions of the laser projection device being configured to cause the laser projection device to perform the laser projection display method according to any one of claims 1 to 8.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111436976.XA CN114155802A (en) | 2021-11-30 | 2021-11-30 | Laser projection display method, laser projection device and readable storage medium |
| PCT/CN2022/135292 WO2023098701A1 (en) | 2021-11-30 | 2022-11-30 | Projection device and projection display method therefor |
| CN202280074826.5A CN118160026A (en) | 2021-11-30 | 2022-11-30 | Projection device and projection display method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111436976.XA CN114155802A (en) | 2021-11-30 | 2021-11-30 | Laser projection display method, laser projection device and readable storage medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114155802A true CN114155802A (en) | 2022-03-08 |
Family
ID=80784251
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111436976.XA Pending CN114155802A (en) | 2021-11-30 | 2021-11-30 | Laser projection display method, laser projection device and readable storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114155802A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023098701A1 (en) * | 2021-11-30 | 2023-06-08 | 青岛海信激光显示股份有限公司 | Projection device and projection display method therefor |
-
2021
- 2021-11-30 CN CN202111436976.XA patent/CN114155802A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023098701A1 (en) * | 2021-11-30 | 2023-06-08 | 青岛海信激光显示股份有限公司 | Projection device and projection display method therefor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7844128B2 (en) | Image display method, image display device, and projector | |
| US9224323B2 (en) | Systems and methods for increasing spatial or temporal resolution for dual modulated display systems | |
| JP2022133326A (en) | Display of DCI and other content in extended dynamic range projectors | |
| RU2413383C2 (en) | Unit of colour conversion to reduce fringe | |
| US20050195223A1 (en) | Light modulating apparatus, optical display apparatus, light modulation control program, optical display apparatus control program, light modulation control method, and optical display apparatus control method | |
| CN114584748B (en) | Laser projection apparatus, display method thereof, and readable storage medium | |
| US7535435B2 (en) | Projector | |
| EP1733372A1 (en) | Display device comprising an adjustable light source | |
| US8730399B2 (en) | Dynamic illumination control for laser projection display | |
| CN104541321A (en) | Display, display control method, display control device, and electronic apparatus | |
| CN106791743B (en) | The method and apparatus that projected image is shown | |
| EP1597915B1 (en) | High contrast stereoscopic projection system | |
| JP2003131322A (en) | Illumination device, projection type display device and driving method thereof | |
| US11102460B2 (en) | Image processing apparatus, display apparatus, and image processing and display apparatus and method | |
| US11463665B2 (en) | Closed loop driving of a highlighter type projector | |
| CN114155802A (en) | Laser projection display method, laser projection device and readable storage medium | |
| JP2002207192A (en) | Video display device and drive circuit | |
| JP2004325644A (en) | projector | |
| JP2018112728A (en) | Liquid crystal driving device, image display device, liquid crystal driving method and liquid crystal driving program | |
| US20170069249A1 (en) | Liquid crystal drive apparatus, image display apparatus and storage medium storing liquid crystal drive program | |
| JPH11109882A (en) | Video display device | |
| CN115840325A (en) | Laser display device, brightness adjusting method thereof and readable storage medium | |
| JP2019101333A (en) | Liquid crystal drive device and liquid crystal display device | |
| JP2009217136A (en) | Display device, display method, and computer program | |
| CN114265569A (en) | Laser projection display method, laser projection device and readable storage medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |