CN110324596A - Clarity detection method and detection device - Google Patents

Abstract

The invention discloses a sharpness detection method and a detection device. The sharpness detection method is applied to a sharpness detection device for detecting projection equipment. The sharpness detection device comprises a collection unit and a projection screen, the collection unit and the The projection devices are arranged on both sides of the projection screen, and the definition detection method includes: controlling the projection device to project a projection image onto the projection screen, where the projection image includes N black blocks, and N is a positive integer ; controlling the collecting unit to collect a first image, the first image including the projection image; determining a scanning area of the first image; scanning the scanning area to determine a first definition. The present invention provides a sharpness detection method and a detection device, aiming at solving the problems of the prior art that there is no uniform detection standard for sharpness detection of projection equipment, and the sharpness detection accuracy of projection equipment is low.

Description

Sharpness detection method and detection device

technical field

The invention relates to the technical field of optical detection, and in particular, to a sharpness detection method and a detection device.

Background technique

In the prior art, the definition of the projected image is one of the important indicators of the performance of the projection equipment. With the development of the prior art, the definition of the projection picture of the projection equipment is getting higher and higher. During sharpness detection, the inspectors are usually used for subjective inspection. Higher sharpness will increase the difficulty of inspection by inspectors, and the inspection results of products by different inspectors are inconsistent, resulting in large inspection errors and low inspection accuracy. question.

SUMMARY OF THE INVENTION

The present invention provides a sharpness detection method and a detection device, aiming at solving the problems of the prior art that there is no uniform detection standard for sharpness detection of projection equipment, and the sharpness detection accuracy of projection equipment is low.

In order to achieve the above object, the present invention proposes a sharpness detection method. The sharpness detection method is applied to a sharpness detection device for detecting projection equipment. The sharpness detection device includes a collection unit and a projection screen. The collection unit The projection equipment is separately arranged on both sides of the projection screen, and the definition detection method includes:

controlling the projection device to project a projection image onto the projection screen, where the projection image includes N black blocks set in the first field of view, where N is a positive integer;

controlling the acquisition unit to acquire a first image, where the first image includes the projection image;

determining the scanning area of the first image;

The scan area is scanned to determine a first definition.

Optionally, the controlling the projection device to project the projection image to the projection screen further includes:

A first setting position of the black block is determined.

Optionally, described determining the first setting position of the black block, including:

determining a field scale of the first field of view;

Obtain the first size and the inclination angle of the black block;

The first setting position is determined according to the first size of the black block, the inclination angle and the field of view ratio.

Optionally, the determining the scanning area of the first image includes:

determining a first scan position of the first field of view;

obtaining a second size of the scan area;

The scanning area of the first image is determined according to the first scanning position and the second size.

Optionally, the determining the first scanning position of the first field of view includes:

determining a first length of the first image along a first direction and a second length along a second direction;

The first scanning position of the first field of view is determined according to the first length, the second length, and the field of view ratio.

Optionally, the scanning of the scanning area to determine the first definition includes:

Scanning the scanning area line by line, and calculating the contrast of the current scanning line;

The average of the contrasts of all the scanning lines is calculated, and the first sharpness is determined according to the average of the contrasts of all the scanning lines.

Optionally, calculating the average value of the contrast of all scanning lines, and determining the first definition according to the average value of the contrast of all scanning lines, and then further comprising:

acquiring a first preset value corresponding to the first field of view;

According to the first definition and the first preset value, the definition of the projection device is judged.

Optionally, the judging the definition of the projection device according to the first definition and the first preset value includes:

When the first definition is greater than or equal to the first preset value, the projection device meets the usage requirements;

When the first definition is smaller than the first preset value, the projection device does not meet the usage requirements.

In order to achieve the above purpose, the present application proposes a sharpness detection device, the sharpness detection device is used to detect the sharpness of a projection device, and the sharpness detection device includes a collection unit, a projection screen and a controller,

the projection screen is arranged between the projection device and the collection unit;

The projection direction of the projection device points to the projection screen;

The collection direction of the collection unit points to the projection screen;

the projection screen is used for receiving the projection image of the projection device;

The acquisition unit is configured to receive the acquired image on the projection screen;

The controller is connected in communication with the projection device and the acquisition unit, and executes the sharpness detection method according to any one of the above embodiments.

Optionally, the sharpness detection device further includes a color corrector, the color corrector is arranged on a side of the projection screen close to the projection device, and the color corrector is used to correct the color of the first image. .

In the technical solution proposed in the present application, the sharpness detection method is applied to a sharpness detection device for detecting projection equipment, the sharpness detection device includes a collection unit and a projection screen, and the sharpness detection method includes: controlling the projection The device projects a projection image onto the projection screen, and the acquisition unit captures a first image, the first image including the projection image, by determining a scanning area of the first image, and performing the scanning operation on the scanning area. Scanning, and determining the first definition, by scanning the first image to determine the first definition, so as to determine the definition of the projection device, avoiding the subjective detection of the definition by the inspector, solving the problem of In the prior art, there is no uniform detection standard for the sharpness detection of the projection device, and the accuracy of the sharpness detection of the projection device is low.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained according to the structures shown in these drawings without creative efforts.

Fig. 1 is the structural representation of the sharpness detection device of the present invention;

2 is a schematic diagram of a first image of an embodiment of a sharpness detection method of the present invention;

FIG. 3 is a schematic flowchart of an embodiment of a clarity detection method of the present invention;

4 is a schematic flowchart of another embodiment of the clarity detection method of the present invention;

5 is a schematic flowchart of another embodiment of the clarity detection method of the present invention;

6 is a schematic flowchart of another embodiment of the clarity detection method of the present invention;

FIG. 7 is a schematic flowchart of another embodiment of the sharpness detection method of the present invention.

Description of reference numbers:

label name label name 10 Projection equipment 30 color corrector 20 projection screen 40 acquisition unit

The realization, functional characteristics and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relationship between various components under a certain posture (as shown in the accompanying drawings). The relative positional relationship, the movement situation, etc., if the specific posture changes, the directional indication also changes accordingly.

In addition, descriptions such as "first", "second", etc. in the present invention are only for descriptive purposes, and should not be construed as indicating or implying their relative importance or implicitly indicating the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, the terms "connected", "fixed" and the like should be understood in a broad sense, for example, "fixed" may be a fixed connection, a detachable connection, or an integrated; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be an internal communication between two elements or an interaction relationship between the two elements, unless otherwise explicitly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

The invention provides an optical performance detection method and detection device.

Please refer to FIG. 1 and FIG. 2 , the sharpness detection method is applied to a sharpness detecting device for detecting the projection equipment 10 , and the sharpness detecting device includes a collection unit 40 and a projection screen 20 ,

Wherein, the projection direction of the projection device 10 points to the projection screen 20 , the collection direction of the acquisition unit 40 points to the projection screen 20 , and the projection screen 20 is a semi-transparent screen, which is arranged on a side of the projection screen 20 . The projection image projected by the projection device 10 on the other side of the projection screen 20 can be collected by the collection unit 40 from the other side of the projection screen 20 .

The sharpness detection method includes:

S100, controlling the projection device 10 to project a projection image onto the projection screen 20, where the projection image includes N black blocks set in the first field of view, where N is a positive integer;

The projection image refers to the image projected by the projection device 10 on the projection screen 20, and the projection image includes N black blocks. Specifically, the projection image is composed of white pixels and black pixels. An image composed of dots, wherein the black area is composed of black pixels, and the contrast of the projected image is determined by the white pixels and the black pixels, thereby determining the definition of the projection device 10 .

S200, controlling the acquisition unit 40 to acquire a first image, where the first image includes the projection image;

The first image refers to a captured image including the projection image captured by the capture unit 40 . Specifically, the projection screen 20 is a transparent screen, and the capture unit 40 is disposed on the projection screen 20 On the side away from the projection device 10 , the projection image projected by the projection device 10 is received by the acquisition unit 40 from the other side of the projection screen 20 .

S300, determining the scanning area of the first image;

Wherein, the scanning area is used to represent a scanning range used for contrast scanning when performing sharpness detection on the projection device 10 , and the sharpness of the projection device 10 is determined by performing contrast scanning in the scanning area.

S400, scan the scanning area to determine a first definition.

Wherein, the first definition is used to represent the definition of the projection device 10 .

In the technical solution proposed in the present application, the sharpness detection method is applied to a sharpness detection device for detecting the projection equipment 10 , and the sharpness detection device includes a collection unit 40 and a projection screen 20 , and the sharpness detection method includes: controlling the The projection device 10 projects the projection image to the projection screen 20, and the acquisition unit 40 acquires a first image, the first image includes the projection image, by determining the scanning area of the first image, and The scanning area is scanned, and the first definition is determined, and the first definition is determined by scanning the first image, so as to determine the definition of the projection device 10, which avoids the subjective judgment of the inspector. The sharpness detection is performed, which solves the problem that there is no uniform detection standard for sharpness detection of the projection device 10 in the prior art, and the sharpness detection accuracy of the projection device 10 is low.

In some optional implementation manners, the foregoing step S100 further includes:

S50, determine the first setting position of the black block;

Specifically, in the process of performing the definition test on the projection device 10, according to the user's requirements for the use of the projection device 10, the definition test will be performed on different fields of view of the projection device 10 respectively. For sharpness scanning requirements, it is necessary to determine the position of the black block in the projected image, so that the sharpness detection device can easily calculate the sharpness through the black block.

Referring to FIG. 3, in a preferred embodiment, the above step S50 includes:

S51, determine the field of view ratio of the first field of view;

The ratio of the field of view is used to represent the range of the field of view to be tested by the projection device 10, the ratio of the field of view is calculated by the ratio of the field of view to be tested to the entire field of view, and the value range of the ratio of the field of view is a positive number greater than 0 and less than or equal to 1. Specifically, the field of view ratio can be 0.3, 0.5 or 0.7. When the field of view ratio is 0.5, the length and width of the field of view to be measured are the entire field of view 0.5 times.

S52, obtain the first size and the inclination angle of the black block;

Wherein, the first size of the black block is used to represent the size of the black block, and the inclination angle of the black block is used to represent the relative inclination angle of the black block and the first image, specifically The black block is a rectangle, and the angle between the long axis direction of the black block and the vertical direction of the first image is 6-8 degrees.

S53: Determine the first setting position according to the first size of the black block, the inclination angle, and the ratio of the field of view.

Wherein, the black block is mainly used to determine the contrast of the first image through the black block in the scanning area and the white pixels on the periphery when the definition calculation is performed, so as to determine the contrast of the first image. The definition of the projection device 10, specifically, when the definition of the projection device 10 is detected, the scanning area will include and only include one side of the black block, which is convenient for the definition detection device to detect all the details. The definition of the projection device 10 is calculated.

Referring to FIG. 4, in some optional implementation manners, the above step S300 includes:

S310, determining the first scanning position of the first field of view;

Wherein, the first scanning position is used to represent the position of the center point of the scanning area, and specifically, the first scanning position is located at the edge of the black block and the color switching of the white pixel on the peripheral side Location.

S320, obtaining the second size of the scanning area;

The second size is used to represent the size of the scanning area. Specifically, the scanning area is a square area, and the direction of the scanning area is consistent with the setting direction of the first image, so that the After contrast scanning is performed in the scanning area, it is convenient for the user to calculate and count the contrast.

S330: Determine the scanning area of the first image according to the first scanning position and the second size.

The first scanning position represents the center of the scanning area, and the second size represents the size of the scanning area. Since the setting direction of the scanning area is the same as the setting direction of the first image, it can be The scan area is accurately determined.

Specifically, when the first image is a rectangle, the center of the first image is located at the intersection of the midpoint vertical line of the first frame and the midpoint vertical line of the second frame. When the ratio of a field of view is 0.7, set the length from the center point on the first image to the edge endpoint as L, then take the center point of the first image as the starting point, and move along the center point of the first image to the edge The position where the extension direction of the end point passes through the length of 0.7L is the center point of the scanning area.

Referring to the above embodiment, when the preset size of the scanning area is 20*20 pixels, the scanning area is centered on the center point of the scanning area and extends 10 pixels to both sides along the first direction, A rectangular area extending 10 pixels to both sides along the second direction is the scanning area.

In addition, in order to perform contrast calculation on different regions of the first field of view, the first image usually includes a plurality of scanning regions, and the plurality of scanning regions are symmetrical about the center of the first image or the The central axis of the first image is set symmetrically.

Referring to FIG. 5, in some optional implementation manners, the above step S400 includes:

S410, scan the scanning area line by line, and calculate the contrast of the current scanning line;

Wherein, the direction of the scanning line is the same as the first direction. When the first image is a black and white picture, the edge of the black block will have a gray pixel area formed by mixing black and white due to the problem of clarity. When the size of the scanning area is 20*20 pixels, The length of each scan line is 20 pixels and the width is 1 pixel, and the contrast of the current scan line is determined by scanning the scan line.

S420: Calculate the average contrast of all scanning lines, and determine the first definition according to the average contrast of all scanning lines.

When the definition in the scanning area is larger, the boundary area between the black pixel point and the white pixel point is more obvious, and the gray similarity generated due to the unsharp projection is less. The smaller the definition is, the less obvious the boundary area between the black pixels and the white pixels is, and the greater the number of the gray pixels. Specifically, after scanning all the scanning lines in the scanning area, the average contrast value of all the scanning lines is confirmed. When the average contrast value is larger, the first sharpness of the scanning area is larger.

Referring to FIG. 6, in some optional implementation manners, the above step S420 further includes:

S430, acquiring a first preset value corresponding to the first field of view;

Wherein, the first preset value is used to represent the definition qualified requirement of the projection device 10 .

S440: Determine the definition of the projection device 10 according to the first definition and the first preset value.

Specifically, when the sharpness detection is completed for the scanning area, the sharpness of the projection device 10 is determined by comparing the first sharpness with the first preset value. When the first definition of the scanning area is greater than or equal to the first preset value, the projection device 10 meets the usage requirements.

In a preferred embodiment, the above step S440 includes:

When the first definition is greater than or equal to the first preset value, the projection device 10 meets the usage requirements;

When the first definition is smaller than the first preset value, the projection device 10 does not meet the usage requirements.

Specifically, when the first definition is greater than or equal to the first preset value, the projection device 10 meets the usage requirements. When the first definition is smaller than the first preset value, the projection device 10 does not meet the usage requirements, and can determine the scanning area where the first definition is smaller than the first preset value, Therefore, it is convenient for inspectors to adjust the projection device 10 subsequently.

In some optional embodiments, when it is necessary to confirm the first definition of the different fields of view for the first image, after calculating the first definition of the different fields of view, determine the different fields of view The maximum value of the first definition of The field of view, the second field of view, and the third field of view are tested for clarity, wherein the field of view ratio of the first field of view is 0.3, the field of view ratio of the second field of view is 0.5, and the third field of view. The ratio of the field of view is 0.7, the first resolution of the first field of view is 92, the first resolution of the second field of view is 87, and the first resolution of the third field of view is 87 The resolution is 78, when the first preset value of the first field of view is 90, the first preset value of the second field of view is 85, and the first preset value of the third field of view is 80 , the definition of the first field of view and the second field of view meet the requirements for use, and the definition of the third field of view does not meet the requirements for use.

In another embodiment, when the first resolution of the first field of view is 92, the first resolution of the second field of view is 87, and the first resolution of the third field of view is 92. When a resolution is 78, the first resolution of the first field of view, the second field of view and the third field of view may be normalized to obtain the first resolution of the respective fields of view If the first sharpness evaluation value of the first field of view is 100, correspondingly, the first sharpness evaluation value of the second field of view is 94.6, and the third field of view has an evaluation value of 94.6. The first sharpness evaluation value of 84.8. The clarity of the second field of view and the third field of view is calculated according to a first preset evaluation value. In a specific implementation, the first preset evaluation value of the second field of view is set to 90, and The first preset value of the third field of view is 85. Since the first sharpness evaluation value of the second field of view is 94.6>90, the first sharpness evaluation value of the third field of view 84.8<85, then the definition of the second field of view meets the use requirements, and the clarity of the third field of view does not meet the use requirements.

In order to achieve the above purpose, the present application proposes a sharpness detection device. The sharpness detection device is used to detect the sharpness of the projection device 10. The sharpness detection device includes a collection unit 40, a projection screen 20 and a controller,

The projection screen 20 is arranged between the projection device 10 and the acquisition unit 40;

The projection direction of the projection device 10 points to the projection screen 20;

The collection direction of the collection unit 40 points to the projection screen 20;

The projection screen 20 is used for receiving the projection image of the projection device 10;

The acquisition unit 40 is configured to receive the acquired image on the projection screen 20;

The controller is connected in communication with the projection device 10 and the acquisition unit 40, and executes the sharpness detection method according to any one of the above embodiments.

In some optional embodiments, the sharpness detection apparatus further includes a color corrector 30, and the color corrector 30 is arranged on a side of the projection screen 20 close to the projection device 10. The color corrector 30 is used to correct the color of the first image. Specifically, in the process of sharpness detection, since the contrast in the scanning area is detected, the color of the first image directly affects the detection result of the sharpness detection. When the projection device 10 projects the projection image onto the projection screen 20, because the projection screen 20 has a color difference, the first image received by the acquisition unit 40 is different from the projection image. The colors cannot be guaranteed to be completely consistent. Through the color corrector 30, the projection image sent by the projection device 10 is transmitted to the projection screen 20 after passing through the color corrector 30, so that the acquisition unit 40 can collect To the first image with accurate color, the accuracy of the detection result of sharpness detection is guaranteed.

In some optional implementation manners, the processor may be a central processing unit (Central Processing Unit, CPU), and may also be other general-purpose processors, digital signal processors (Digital Signal Processors, DSP), application specific integrated circuits (Application Specific Integrated Circuits) Integrated Circuit, ASIC), Field-Programmable Gate Array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory may be an internal storage unit of the device, such as a hard disk or memory of the device. The memory may also be an external storage device of the device, such as a pluggable hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash memory card (Flash Card) and the like equipped on the device. Further, the memory may also include both an internal storage unit of the device and an external storage device. The memory is used to store the computer program and other programs and data required by the device. The memory may also be used to temporarily store data that has been output or is to be output.

Those skilled in the art can clearly understand that, for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned functions can be allocated to different functional units, Module completion, that is, dividing the internal structure of the device into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment may be integrated in one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit, and the above-mentioned integrated units may adopt hardware. It can also be realized in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing from each other, and are not used to limit the protection scope of the present application. For the specific working processes of the units and modules in the above-mentioned system, reference may be made to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

The above descriptions are only the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Under the inventive concept of the present invention, the equivalent structural transformations made by the contents of the description and drawings of the present invention, or the direct/indirect application Other related technical fields are included in the scope of patent protection of the present invention.

Claims (10)

1. a kind of clarity detection method, which is characterized in that the clarity detection method is applied to the clear of detection of projection devices Clear degree detection device, the clarity detection device include acquisition unit and projection screen, the acquisition unit and the projection Equipment is divided into the two sides of the projection screen, and the clarity detection method includes:

The projection device is controlled by projector, image projection to the projection screen, the projected image includes being set to the first visual field N number of black block, N is positive integer；

It controls the acquisition unit and acquires the first image, the first image includes the projected image；

Determine the scanning area of the first image；

The scanning area is scanned, determines the first clarity.

2. clarity detection method as described in claim 1, which is characterized in that described to control the projection device for perspective view As projection to the projection screen, before further include:

Determine the first setting position of the black block.

3. clarity detection method as claimed in claim 2, which is characterized in that the first of the determination black block sets Seated position, comprising:

Determine the visual field ratio of first visual field；

Obtain the first size and tilt angle of the black block；

According to the first size of the black block, the tilt angle and the visual field ratio, first setting is determined Position.

4. clarity detection method as described in claim 1, which is characterized in that the scanning area of the determining the first image Domain, comprising:

Determine the first scan position of first visual field；

Obtain the second size of the scanning area；

According to first scan position and second size, the scanning area of the first image is determined.

5. clarity detection method as claimed in claim 4, which is characterized in that the first of determination first visual field is swept Retouch position, comprising:

Determine first length and second length in a second direction of the first image along first direction；

According to first length, second length and the visual field ratio, described the first of first visual field is determined Scan position.

6. clarity detection method as described in claim 1, which is characterized in that it is described that the scanning area is scanned, Determine the first clarity, comprising:

The scanning area is scanned line by line, and calculates the contrast of current scan line；

The average value of the contrast of whole scan lines is calculated, and determines described first according to the contrast average value of whole scan lines Clarity.

7. clarity detection method as claimed in claim 6, which is characterized in that the contrast for calculating whole scan lines Average value, and first clarity is determined according to the contrast average value of whole scan lines, later further include:

Obtain corresponding first preset value of first visual field；

According to first clarity and first preset value, the clarity of the projection device is judged.

8. clarity detection method as claimed in claim 7, which is characterized in that it is described according to first clarity with it is described First preset value judges the clarity of the projection device, comprising:

When first clarity is greater than or equal to first preset value, the projection device meets requirement；

When first clarity is less than first preset value, the projection device is unsatisfactory for requirement.

9. a kind of clarity detection device, which is characterized in that the clarity detection device is clear for detection of projection devices Degree, the clarity detection device include acquisition unit, projection screen and controller,

The projection screen is set between the projection device and the acquisition unit；

The projecting direction of the projection device is directed toward the projection screen；

It is directed toward the projection screen in the acquisition direction of the acquisition unit；

The projection screen is used to receive the projected image of the projection device；

The acquisition unit is used to receive the acquisition image on the projection screen；

The controller and the projection device and the acquisition unit communicate to connect, and execute as claim 1-8 is any Clarity detection method described in.

10. clarity detection device as claimed in claim 9, which is characterized in that the clarity detection device further includes face Color corrector, the color correction device are set to the projection screen close to the side of the projection device, the color correction device For correcting the color of the first image.