CN106441820B - Display screen homogeneity testing method and system - Google Patents
Display screen homogeneity testing method and system Download PDFInfo
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- CN106441820B CN106441820B CN201611059402.4A CN201611059402A CN106441820B CN 106441820 B CN106441820 B CN 106441820B CN 201611059402 A CN201611059402 A CN 201611059402A CN 106441820 B CN106441820 B CN 106441820B
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a kind of display screen homogeneity testing methods, comprising: the display status image is determined as initial pictures, and is filtered the initial pictures to generate filtering image by the display status image for obtaining display screen to be tested；According to the value differences of each pixel on the initial pictures and the filtering image, the contrast images of the interference pixel value for characterizing the initial pictures are generated；According to the value differences of each pixel on the initial pictures and the contrast images, the uniform distribution image of the initial pictures is generated.The invention also discloses a kind of display screen uniformity test systems.Technical solution of the present invention is intended to reflect by test result the uniform distribution situation of reflection display screen.
Description
Technical field
The present invention relates to display screen the field of test technology more particularly to a kind of display screen homogeneity testing methods and display screen
Uniformity test system.
Background technique
Display screen is commonly used for the display unit of the display devices such as television set or computer, and the brightness uniformity of display screen reacts
The quality of display screen uniformity.If display screen is uniform, image display effect is preferable, conversely, then display effect is poor.
In the prior art, the uniformity for generalling use 9 method of testing detection display screens, i.e., randomly select on a display screen
Nine sampling points or module carry out luminance test, and since the selection of sampling point or module has randomness, and sampling point is chosen quantity and had
Limit, therefore test result can only reflect the perhaps picture of the pixel value of module or whole sampling points or module of the sampling point on display screen
Element value mean value.
The drawbacks of above-mentioned technical proposal is that test result cannot reflect the uniform distribution situation of display screen.
Summary of the invention
The main purpose of the present invention is to provide a kind of display screen homogeneity testing methods, it is intended to be reflected by test result
The uniform distribution situation of display screen.
To achieve the above object, display screen homogeneity testing method provided by the invention, includes the following steps:
The display status image is determined as initial pictures by the display status image for obtaining display screen to be tested, and right
The initial pictures are filtered to generate filtering image；
According to the value differences of each pixel on the initial pictures and the filtering image, generate for characterizing
The contrast images of the interference pixel value of the initial pictures；
According to the value differences of each pixel on the initial pictures and the contrast images, generate described initial
The uniform distribution image of image.
Preferably, the display status image for obtaining display screen to be tested, the display status image is determined as just
Beginning image, and the initial pictures are filtered to generate filtering image, comprising:
Obtain the display status image of display screen to be tested；
Down-sampled processing is carried out to the display status image, to generate down-sampled image；
The down-sampled image is determined as the initial pictures；
The initial pictures are filtered to generate filtering image.
It is preferably, described that the initial pictures are filtered to generate filtering image, comprising:
Preset image filtering template is obtained, the size of described image Filtering Template is greater than preset value；
According to described image Filtering Template, process of convolution is filtered to the initial pictures to generate the filtering figure
Picture.
Preferably, the value differences according to each pixel on the initial pictures and the filtering image,
Generate the contrast images of the interference pixel value for characterizing the initial pictures, comprising:
The pixel value of each pixel on the initial pictures is obtained, and obtains each pixel on the filtering image
The pixel value of point；
According to each pixel on the pixel value and the filtering image of each pixel on the initial pictures
Pixel value calculates the margin of image element of the corresponding pixel points on each pixel and the filtering image on the initial pictures
It is different；
According to each pixel on the pixel value and the filtering image of each pixel on the initial pictures
Pixel value calculates the pixel value mean value of the initial pictures Yu the filtering image；
According to the ratio of the value differences and the pixel value mean value, generate for characterizing the dry of the initial pictures
Disturb the contrast images of pixel value.
Preferably, the value differences according to each pixel on the initial pictures and the contrast images,
After the uniform distribution image for generating the initial pictures, further includes:
The position of each pixel and pixel value on the uniform distribution image are obtained, according to the uniform distribution figure
The pixel value of each pixel, generates the uniform distribution of the initial pictures in the size of picture and the uniform distribution image
Emulating image.
In addition, to achieve the above object, the present invention also provides a kind of display screen uniformity test systems, comprising:
The display status image is determined as by processing module for obtaining the display status image of display screen to be tested
Initial pictures, and the initial pictures are filtered to generate filtering image；
Contrast images generation module, for the picture according to each pixel on the initial pictures and the filtering image
Plain value difference is different, generates the contrast images of the interference pixel value for characterizing the initial pictures；
Homogeneity is as generation module, for according to each pixel on the initial pictures and the contrast images
Value differences generate the uniform distribution image of the initial pictures.
Preferably, the processing module includes:
First acquisition unit, for obtaining the display status image of display screen to be tested；
Down-sampled unit, for carrying out down-sampled processing to the display status image, to generate down-sampled image；
Determination unit, for the down-sampled image to be determined as the initial pictures；
Filter unit, for being filtered the initial pictures to generate filtering image.
Preferably, the filter unit includes:
Subelement is obtained, for obtaining preset image filtering template, the size of described image Filtering Template is greater than default
Value；
Filtering subunit, for being filtered at convolution to the display status image according to described image Filtering Template
Reason is to generate the filtering image.
Preferably, the contrast images generation module includes:
Second acquisition unit for obtaining the pixel value of each pixel on the initial pictures, and obtains the filter
The pixel value of each pixel on wave image；
Difference value computing unit, for according to the pixel value of each pixel on the initial pictures and filtering figure
As the pixel value of upper each pixel, calculate each pixel on the initial pictures with it is corresponding on the filtering image
The value differences of pixel；
Average calculation unit, for the pixel value and the filtering image according to each pixel on the initial pictures
On each pixel pixel value, calculate the pixel value mean value of the initial pictures Yu the filtering image；
Contrast images generation unit is generated and is used for the ratio according to the value differences and the pixel value mean value
In the contrast images for the interference pixel value for characterizing the initial pictures.
Preferably, the display screen uniformity test system further include:
Emulation module, for obtaining the position of each pixel and pixel value on the uniform distribution image, according to institute
The pixel value for stating each pixel in the size and the uniform distribution image of uniform distribution image, generates the initial graph
The uniform distribution emulating image of picture.
In the inventive solutions, the contrast images are according on the initial pictures and the filtering image
What the value differences of each pixel generated, the pixel value of each pixel in the contrast images is described first for characterizing
The pixel value interference value of corresponding pixel points on beginning image, therefore, according to the initial pictures with it is each in the contrast images
The uniform distribution image that the value differences of pixel generate is the picture after the pixel value of exclusion all pixels point interferes
Plain Distribution value image, according to the uniform distribution image, can understand on the display screen to be tested with the initial graph
As the uniform distribution situation of corresponding display area.
Detailed description of the invention
Fig. 1 is the flow diagram of the display screen of the invention homogeneity testing method first embodiment；
Fig. 2 is the display status image of the display screen of the invention homogeneity testing method；
Fig. 3 is the contrast images of the display screen of the invention homogeneity testing method；
Fig. 4 is the flow diagram of the display screen of the invention homogeneity testing method second embodiment；
Fig. 5 is down-sampled treated the down-sampled image of display status image shown in Fig. 3；
Fig. 6 is the flow diagram of the display screen of the invention homogeneity testing method 3rd embodiment；
Fig. 7 is the image filtering template of the display screen of the invention homogeneity testing method；
Fig. 8 is the flow diagram of the display screen of the invention homogeneity testing method fourth embodiment；
Fig. 9 is the flow diagram of the 5th embodiment of the display screen of the invention homogeneity testing method；
Figure 10 is the display screen having good uniformity in the display screen of the invention homogeneity testing method；
Figure 11 is the good corresponding uniform distribution image of display screen of uniformity shown in Fig. 10；
Figure 12 is the corresponding uniform distribution emulating image of uniform distribution image shown in Figure 11；
Figure 13 is the undesirable display screen of uniformity in the display screen of the invention homogeneity testing method；
Figure 14 is the corresponding uniform distribution emulating image of the undesirable display screen of uniformity shown in Figure 13；
Figure 15 is uniform distribution emulating image flipchart shown in Figure 14；
Figure 16 is the functional block diagram of the display screen of the invention uniformity test system first embodiment；
Figure 17 is the functional block diagram of the display screen of the invention uniformity test system second embodiment；
Figure 18 is the functional block diagram of the display screen of the invention uniformity test system 3rd embodiment；
Figure 19 is the functional block diagram of the display screen of the invention uniformity test system fourth embodiment；
Figure 20 is the functional block diagram of the 5th embodiment of the display screen of the invention uniformity test system.
The object of the invention is realized, the embodiments will be further described with reference to the accompanying drawings for functional characteristics and advantage.
Specific embodiment
It should understand, the specific embodiments described herein are merely illustrative of the present invention, is not intended to limit the present invention.
The present invention provides a kind of display screen homogeneity testing method.
It please refers to Fig.1 to Fig.3, to achieve the above object, the first embodiment of the present invention provides a kind of display screen uniformity
Test method includes the following steps:
Step S10 obtains the display status image of display screen to be tested, and the display status image is determined as initial graph
Picture, and the initial pictures are filtered to generate filtering image；
Step S20 is generated according to the value differences of each pixel on the initial pictures and the filtering image
For characterizing the contrast images of the interference pixel value of the initial pictures；
Step S30 is generated according to the value differences of each pixel on the initial pictures and the contrast images
The uniform distribution image of the initial pictures.
In the inventive solutions, the contrast images are according on the initial pictures and the filtering image
What the value differences of each pixel generated, the pixel value of each pixel in the contrast images is described first for characterizing
The pixel value interference value of corresponding pixel points on beginning image, therefore, according to the initial pictures with it is each in the contrast images
The uniform distribution image that the value differences of pixel generate is the picture after the pixel value of exclusion all pixels point interferes
Plain Distribution value image, according to the uniform distribution image, can understand on the display screen to be tested with the initial graph
As the uniform distribution situation of corresponding display area.
The display status image may include whole display areas of display screen, also may include the part for answering display screen
Display area, when the display status image includes whole display areas of display screen, the uniform distribution figure that finally obtains
As the uniform distribution situation of whole display areas of the corresponding display screen, when the display state only includes the portion of display screen
When dividing display area, the uniform distribution image finally obtained corresponds to the uniform distribution of the part display area of the display screen
Situation.
The display status image is to be shot to obtain by video camera high-definition, described to be tested aobvious in order to analyze comprehensively
The uniformity of display screen, therefore, the display status image should include whole display areas of display screen.In order to obtain brightness height
The display status image display screen to be tested can be made to be in complete white field signal when carrying out display status image shooting
Display state.Certainly, the display status image is not limited in obtaining under complete white field signal.
In the present embodiment, resolution ratio is used to obtain the display status image for 2120 × 3800 video camera.
The initial pictures are to can be the display status image for being filtered and the image of subsequent calculating
Itself, is also possible to carry out the display status image the down-sampled image obtained after down-sampled processing, and down-sampled processing is used
In reducing pixel, to reduce the calculation amount of entire filtering and calculating process.
The filtering processing is the noise for removing the initial pictures, and the noise is in the display status image
Acquisition process in, as shake or light it is dimmed suddenly caused by image noise, filtering processing can use mean filter
Or Gaussian filter.Since the filtering image is to be filtered acquisition by the initial pictures, the filtering
The size of image is identical as the size of the initial pictures.
The contrast images are the pixel value buildings of each pixel according to the initial pictures Yu the filtering image
Differential image.Since the filtering image is the image for removing noise disturbing factor, so, the initial pictures and the filter
The value differences of each pixel of wave image can characterize the interference pixel value of each pixel on the initial pictures, institute
Stating interference pixel value can be the interference of pixel value caused by noise, be also possible to mura line.
The uniform distribution image is to can be used for characterizing the display screen to be tested after exclusive PCR pixel value
The image of uniformity, according to the uniform distribution image, the uniform distribution image of the available initial pictures is described
The uniform distribution result of initial pictures is identical as the display status image, therefore, can according to the uniform distribution image
Obtain the uniform distribution image of the corresponding display area of the display status image.
Fig. 4 to Fig. 5 is please referred to, it is of the invention based on the first embodiment of display screen homogeneity testing method of the invention
In the second embodiment of display screen homogeneity testing method, step S10 includes:
Step S11 obtains the display status image of display screen to be tested；
Step S12 carries out down-sampled processing to the display status image, to generate down-sampled image；
The down-sampled image is determined as the initial pictures by step S13；
Step S14 is filtered to generate filtering image the initial pictures.
Down-sampled processing is carried out to the display status image, to reduce image slices vegetarian refreshments, and reduces calculation amount.
Specifically, in down-sampled processing method, by down-sampled parameter, determine sampled point in calculating number.The drop
Sampling parameter is used for the pixel quantity for indicating to be spaced between two sampled points.
The down-sampled parameter is the arbitrary integer greater than 1, and the numerical value of the down-sampled parameter is bigger, shows pick up two
Interval between a sampled point is bigger, and therefore, the sampled point number of selection is fewer, and calculation amount is lower.
In the present embodiment, by down-sampled processing, down-sampled image D_img is generated, the down-sampled parameter is set as
4, it indicates to be spaced four pixels between two sampled points.Since the size of the display status image is 2120 × 3800, because
This, the size of the down-sampled image D_img obtained by down-sampled processing is 530 × 950.
Since down-sampled process is according to preset pixel interval, to each pixel in the display status image
It is sampled, it is readily appreciated that, down-sampled processing will not change the pixel value distribution situation in the display status image, therefore,
The down-sampled image and the display status image have same uniform distribution situation, and down-sampled process is effectively reduced
The calculation amount of entire uniformity test process, is conducive to the computing resource of saving system.
Certainly, it if the computing resource of system is enough or the time long enough of uniformity test process, can not also adopt
With down-sampled processing.
Fig. 6 to Fig. 7 is please referred to, it is of the invention based on the second embodiment of display screen homogeneity testing method of the invention
In the 3rd embodiment of display screen homogeneity testing method, step S14 includes:
Step S141, obtains preset image filtering template, and the size of described image Filtering Template is greater than preset value；
Step S142 is filtered process of convolution to the initial pictures according to described image Filtering Template to generate
State filtering image.
Described image Filtering Template is G_img, and the filtering image can be pre-stored in system.In the present embodiment, institute
The pixel value for stating each pixel in image filtering template is arranged according to following formula:
Wherein, i indicates that the abscissa of the pixel on described image Filtering Template, j indicate on described image Filtering Template
Pixel ordinate, s indicates that per size once, r is indicated per video resolution once, s > 0, r > 0,1≤i≤
N1, 1≤j≤N2, s and r can be set as needed respectively, N1For the length of described image Filtering Template, N2For described image filtering
The width of template.
Described image Filtering Template is for being filtered process of convolution to the initial pictures, therefore, described image filtering
The size of template is bigger, and the speed of filtering processing is bigger, therefore, N1Preferably greater than or equal to 10, N2Preferably greater than or equal to 10, but N1
And N2Range not therefore limited.
In the present embodiment, s is set as 10, r and is set as 48, N1It is set as 11, N211 are set as, certainly, this four parameters
Numerical value can be configured according to actual needs, be not limited thereto.
After filtering process of convolution, the filtering image of generation is H_img, in which:
Referring to Fig. 8, the first embodiment based on display screen homogeneity testing method of the invention is to 3rd embodiment, this
In the fourth embodiment of the display screen homogeneity testing method of invention, step S20 includes:
Step S21, obtains the pixel value of each pixel on the initial pictures, and obtains on the filtering image
The pixel value of each pixel；
Step S22, according to each of on the pixel value and the filtering image of each pixel on the initial pictures
The pixel value of pixel calculates the picture of the corresponding pixel points on each pixel and the filtering image on the initial pictures
Plain value difference is different；
Step S23, according to each of on the pixel value and the filtering image of each pixel on the initial pictures
The pixel value of pixel calculates the pixel value mean value of the initial pictures Yu the filtering image；
Step S24 is generated described initial for characterizing according to the ratio of the value differences and the pixel value mean value
The contrast images of the interference pixel value of image.
Some pixel on the initial pictures and the value differences of the corresponding pixel points on the filtering image are big
It is small, indicate the size of the interference pixel value of the pixel on the initial pictures.
Since the pixel value of each pixel in the contrast images is the margin of image element according to each pixel
The different ratio with the pixel value mean value obtains, and pixel value is greater than 0 numerical value, therefore, in the present embodiment, using institute
Value differences described in the absolute value representation of value differences are stated, and according to the absolute value of the value differences and the pixel
It is worth the ratio of mean value, generates the contrast images.
The contrast images are C_img, its calculation formula is:
Wherein, down-sampled image is identical as the size of filtering image, N3For down-sampled image D_img or filtering image H_
Pixel sum on img, N3> 0, k are the pixel value on down-sampled image D_img or filtering image H_img, 1≤k
≤N3。
In the present embodiment, since the size of the down-sampled image is 530 × 950, N3=503500.
Referring to Fig. 9, the first embodiment based on display screen homogeneity testing method of the invention, display screen of the invention
In 5th embodiment of homogeneity testing method, after step S30, further includes:
Step S40 obtains the position of each pixel and pixel value on the uniform distribution image, according to described uniform
The pixel value of each pixel, generates the equal of the initial pictures in the size of property distributed image and the uniform distribution image
Even property distributed simulation image.
According to the pixel value of each pixel in the size of the uniform distribution image and the uniform distribution image,
The uniform distribution emulating image of the display area of the corresponding display screen to be tested of the initial pictures is generated, namely is generated
The uniform distribution emulating image of the display area for showing the corresponding display screen to be tested of status image, it is described uniform
Property distributed simulation image in, each pixel value indicated with the color different from other pixel values or each pixel value section use
The color different from other pixel value sections indicates.
When a certain pixel is different from the pixel value of surrounding pixel point, or is not belonging to same pixel value section, the picture
The color of vegetarian refreshments will be different from the color of surrounding pixel point, by the difference of color, can clearly judge it is described to
The uniform distribution situation of each display area on display screen is tested, is surveyed to quickly and accurately obtain uniform distribution situation
The result of examination.
Figure 10 to Figure 12 is please referred to, wherein in uniform distribution emulating image shown in Figure 12, the pixel value of each pixel
Without obvious color difference, therefore, it can determine whether that the corresponding display screen of uniform distribution emulating image has good uniformity.
Figure 13 to Figure 15 is please referred to again, wherein in uniform distribution emulating image shown in Figure 14, is existed much and surrounding
The different pixel of color, for example, the pixel different from ambient color there are several colors therefore can in circle in figure
Judge that the corresponding display screen uniformity of the uniform distribution emulating image is bad, and can be understood by the distribution situation of color aobvious
The uniform distribution situation of display screen, judgment method are simple and accurate.
In addition, please referring to Fig. 2, Fig. 3 and Figure 16, to achieve the above object, the first embodiment of the present invention provides a kind of aobvious
Display screen uniformity test system, the display screen uniformity test system include:
Processing module 10 determines the display status image for obtaining the display status image of display screen to be tested
For initial pictures, and the initial pictures are filtered to generate filtering image；
Contrast images generation module 20, for according to each pixel on the initial pictures and the filtering image
Value differences generate the contrast images of the interference pixel value for characterizing the initial pictures；
Homogeneity is as generation module 30, for according to each pixel on the initial pictures and the contrast images
Value differences, generate the uniform distribution image of the initial pictures.
In the inventive solutions, the contrast images are according on the initial pictures and the filtering image
What the value differences of each pixel generated, the pixel value of each pixel in the contrast images is described first for characterizing
The pixel value interference value of corresponding pixel points on beginning image, therefore, according to the initial pictures with it is each in the contrast images
The uniform distribution image that the value differences of pixel generate is the picture after the pixel value of exclusion all pixels point interferes
Plain Distribution value image, according to the uniform distribution image, can understand on the display screen to be tested with the initial graph
As the uniform distribution situation of corresponding display area.
The display status image may include whole display areas of display screen, also may include the part for answering display screen
Display area, when the display status image includes whole display areas of display screen, the uniform distribution figure that finally obtains
As the uniform distribution situation of whole display areas of the corresponding display screen, when the display state only includes the portion of display screen
When dividing display area, the uniform distribution image finally obtained corresponds to the uniform distribution of the part display area of the display screen
Situation.
The display status image is to be shot to obtain by video camera high-definition, described to be tested aobvious in order to analyze comprehensively
The uniformity of display screen, therefore, the display status image should include whole display areas of display screen.In order to obtain brightness height
The display status image display screen to be tested can be made to be in complete white field signal when carrying out display status image shooting
Display state.Certainly, the display status image is not limited in obtaining under complete white field signal.
In the present embodiment, resolution ratio is used to obtain the display status image for 2120 × 3800 video camera.
The initial pictures are to can be the display status image for being filtered and the image of subsequent calculating
Itself, is also possible to carry out the display status image the down-sampled image obtained after down-sampled processing, and down-sampled processing is used
In reducing pixel, to reduce the calculation amount of entire filtering and calculating process.
The filtering processing is the noise for removing the initial pictures, and the noise is in the display status image
Acquisition process in, as shake or light it is dimmed suddenly caused by image noise, filtering processing can use mean filter
Or Gaussian filter.Since the filtering image is to be filtered acquisition by the initial pictures, the filtering
The size of image is identical as the size of the initial pictures.
The contrast images are the pixel value buildings of each pixel according to the initial pictures Yu the filtering image
Differential image.Since the filtering image is the image for removing noise disturbing factor, so, the initial pictures and the filter
The value differences of each pixel of wave image can characterize the interference pixel value of each pixel on the initial pictures, institute
Stating interference pixel value can be the interference of pixel value caused by noise, be also possible to mura line.
The uniform distribution image is to can be used for characterizing the display screen to be tested after exclusive PCR pixel value
The image of uniformity, according to the uniform distribution image, the uniform distribution image of the available initial pictures is described
The uniform distribution result of initial pictures is identical as the display status image, therefore, can according to the uniform distribution image
Obtain the uniform distribution image of the corresponding display area of the display status image.
Fig. 5 and Figure 17 is please referred to, it is of the invention based on the first embodiment of display screen uniformity test system of the invention
In the second embodiment of display screen uniformity test system, the processing module 10 includes:
First acquisition unit 11, for obtaining the display status image of display screen to be tested；
Down-sampled unit 12, for carrying out down-sampled processing to the display status image, to generate down-sampled image；
Determination unit 13, for the down-sampled image to be determined as the initial pictures；
Filter unit 14, for being filtered the initial pictures to generate filtering image.
Down-sampled processing is carried out to the display status image, to reduce image slices vegetarian refreshments, and reduces calculation amount.
Specifically, in down-sampled processing method, by down-sampled parameter, determine sampled point in calculating number.The drop
Sampling parameter is used for the pixel quantity for indicating to be spaced between two sampled points.
The down-sampled parameter is the arbitrary integer greater than 1, and the numerical value of the down-sampled parameter is bigger, shows pick up two
Interval between a sampled point is bigger, and therefore, the sampled point number of selection is fewer, and calculation amount is lower.
In the present embodiment, by down-sampled processing, down-sampled image D_img is generated, the down-sampled parameter is set as
4, it indicates to be spaced four pixels between two sampled points.Since the size of the display status image is 2120 × 3800, because
This, the size of the down-sampled image D_img obtained by down-sampled processing is 530 × 950.
Since down-sampled process is according to preset pixel interval, to each pixel in the display status image
It is sampled, it is readily appreciated that, down-sampled processing will not change the pixel value distribution situation in the display status image, therefore,
The down-sampled image and the display status image have same uniform distribution situation, and down-sampled process is effectively reduced
The calculation amount of entire uniformity test process, is conducive to the computing resource of saving system.
Certainly, it if the computing resource of system is enough or the time long enough of uniformity test process, can not also adopt
With down-sampled processing.
Fig. 7 and Figure 18 is please referred to, it is of the invention based on the second embodiment of display screen uniformity test system of the invention
In the 3rd embodiment of display screen uniformity test system, the filter unit 14 includes:
Subelement 141 is obtained, for obtaining preset image filtering template, the size of described image Filtering Template is greater than pre-
If value；
Filtering subunit 142, for being filtered convolution to the display status image according to described image Filtering Template
Processing is to generate the filtering image.
Described image Filtering Template is G_img, and the filtering image can be pre-stored in system.In the present embodiment, institute
The pixel value for stating each pixel in image filtering template is arranged according to following formula:
Wherein, i indicates that the abscissa of the pixel on described image Filtering Template, j indicate on described image Filtering Template
Pixel ordinate, s indicates that per size once, r is indicated per video resolution once, s > 0, r > 0,1≤i≤
N1, 1≤j≤N2, s and r can be set as needed respectively, N1For the length of described image Filtering Template, N2For described image filtering
The width of template.
Described image Filtering Template is for being filtered process of convolution to the initial pictures, therefore, described image filtering
The size of template is bigger, and the speed of filtering processing is bigger, therefore, N1Preferably greater than or equal to 10, N2Preferably greater than or equal to 10, but N1
And N2Range not therefore limited.
In the present embodiment, s is set as 10, r and is set as 48, N1It is set as 11, N211 are set as, certainly, this four parameters
Numerical value can be configured according to actual needs, be not limited thereto.
After filtering process of convolution, the filtering image of generation is H_img, in which:
Figure 19 is please referred to, the first embodiment based on display screen uniformity test system of the invention to 3rd embodiment,
In the fourth embodiment of display screen uniformity test system of the invention, the contrast images generation module 20 includes:
Second acquisition unit 21, for obtaining the pixel value of each pixel on the initial pictures, and described in acquisition
The pixel value of each pixel on filtering image；
Difference value computing unit 22, for according to each pixel on the initial pictures pixel value and the filtering
The pixel value of each pixel on image calculates pair on each pixel and the filtering image on the initial pictures
Answer the value differences of pixel；
Average calculation unit 23, for according to the pixel value of each pixel on the initial pictures and filtering figure
As the pixel value of upper each pixel, the pixel value mean value of the initial pictures Yu the filtering image is calculated；
Contrast images generation unit 24 is generated for the ratio according to the value differences and the pixel value mean value
For characterizing the contrast images of the interference pixel value of the initial pictures.
Some pixel on the initial pictures and the value differences of the corresponding pixel points on the filtering image are big
It is small, indicate the size of the interference pixel value of the pixel on the initial pictures.
Since the pixel value of each pixel in the contrast images is the margin of image element according to each pixel
The different ratio with the pixel value mean value obtains, and pixel value is greater than 0 numerical value, therefore, in the present embodiment, using institute
Value differences described in the absolute value representation of value differences are stated, and according to the absolute value of the value differences and the pixel
It is worth the ratio of mean value, generates the contrast images.
The contrast images are C_img, its calculation formula is:
Wherein, down-sampled image is identical as the size of filtering image, N3For down-sampled image D_img or filtering image H_
Pixel sum on img, N3> 0, k are the pixel value on down-sampled image D_img or filtering image H_img, 1≤k
≤N3。
In the present embodiment, since the size of the down-sampled image is 530 × 950, N3=503500.
Figure 20 is please referred to, based on the first embodiment of display screen uniformity test system of the invention, display of the invention
In the 5th embodiment for shielding uniformity test system, the display screen uniformity test system further include:
Emulation module 40, for obtaining the position of each pixel and pixel value on the uniform distribution image, according to
The pixel value of each pixel in the size of the uniform distribution image and the uniform distribution image generates described initial
The uniform distribution emulating image of image.
According to the pixel value of each pixel in the size of the uniform distribution image and the uniform distribution image,
The uniform distribution emulating image of the display area of the corresponding display screen to be tested of the initial pictures is generated, namely is generated
The uniform distribution emulating image of the display area for showing the corresponding display screen to be tested of status image, it is described uniform
Property distributed simulation image in, each pixel value indicated with the color different from other pixel values or each pixel value section use
The color different from other pixel value sections indicates.
When a certain pixel is different from the pixel value of surrounding pixel point, or is not belonging to same pixel value section, the picture
The color of vegetarian refreshments will be different from the color of surrounding pixel point, by the difference of color, can clearly judge it is described to
The uniform distribution situation of each display area on display screen is tested, is surveyed to quickly and accurately obtain uniform distribution situation
The result of examination.
Figure 10 to Figure 12 is please referred to, wherein in uniform distribution emulating image shown in Figure 12, the pixel value of each pixel
Without obvious color difference, therefore, it can determine whether that the corresponding display screen of uniform distribution emulating image has good uniformity.
Figure 13 to Figure 15 is please referred to again, wherein in uniform distribution emulating image shown in Figure 14, is existed much and surrounding
The different pixel of color, for example, the pixel different from ambient color there are several colors therefore can in circle in figure
Judge that the corresponding display screen uniformity of the uniform distribution emulating image is bad, and can be understood by the distribution situation of color aobvious
The uniform distribution situation of display screen, judgment method are simple and accurate.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (8)
1. a kind of display screen homogeneity testing method, which comprises the steps of:
The display status image is determined as initial pictures by the display status image for obtaining display screen to be tested, and to described
Initial pictures are filtered to generate filtering image；
According to the value differences of each pixel on the initial pictures and the filtering image, generate described for characterizing
The contrast images of the interference pixel value of initial pictures；
According to the value differences of each pixel on the initial pictures and the contrast images, the initial pictures are generated
Uniform distribution image；
The position of each pixel and pixel value on the uniform distribution image are obtained, according to the uniform distribution image
The pixel value of each pixel in size and the uniform distribution image generates the uniform distribution emulation of the initial pictures
Image, wherein each pixel value indicated with the color different from other pixel values or each pixel value section with other pictures
The different color in element value section indicates.
2. display screen homogeneity testing method according to claim 1, which is characterized in that described to obtain display screen to be tested
Display status image, the display status image is determined as initial pictures, and be filtered to the initial pictures
To generate filtering image, comprising:
Obtain the display status image of display screen to be tested；
Down-sampled processing is carried out to the display status image, to generate down-sampled image；
The down-sampled image is determined as the initial pictures；
The initial pictures are filtered to generate filtering image.
3. display screen homogeneity testing method according to claim 2, which is characterized in that it is described to the initial pictures into
Row filtering processing is to generate filtering image, comprising:
Preset image filtering template is obtained, the size of described image Filtering Template is greater than preset value；
According to described image Filtering Template, process of convolution is filtered to the initial pictures to generate the filtering image.
4. display screen homogeneity testing method as claimed in any of claims 1 to 3, which is characterized in that described
According to the value differences of each pixel on the initial pictures and the filtering image, generate for characterizing the initial graph
The contrast images of the interference pixel value of picture, comprising:
The pixel value of each pixel on the initial pictures is obtained, and obtains each pixel on the filtering image
Pixel value；
According to the pixel of each pixel on the pixel value and the filtering image of each pixel on the initial pictures
Value calculates the value differences of the corresponding pixel points on each pixel and the filtering image on the initial pictures；
According to the pixel of each pixel on the pixel value and the filtering image of each pixel on the initial pictures
Value, calculates the pixel value mean value of the initial pictures Yu the filtering image；
According to the ratio of the value differences and the pixel value mean value, the interference picture for characterizing the initial pictures is generated
The contrast images of element value.
5. a kind of display screen uniformity test system characterized by comprising
The display status image is determined as initially by processing module for obtaining the display status image of display screen to be tested
Image, and the initial pictures are filtered to generate filtering image；
Contrast images generation module, for the pixel value according to each pixel on the initial pictures and the filtering image
Difference generates the contrast images of the interference pixel value for characterizing the initial pictures；
Homogeneity is as generation module, for the pixel according to each pixel on the initial pictures and the contrast images
Value difference is different, generates the uniform distribution image of the initial pictures；
Emulation module, for obtaining the position of each pixel and pixel value on the uniform distribution image, according to described equal
The pixel value of each pixel, generates the initial pictures in the size of even property distributed image and the uniform distribution image
Uniform distribution emulating image, wherein each pixel value is indicated with the color different from other pixel values or each pixel value
Section is indicated with the color different from other pixel value sections.
6. display screen uniformity test system according to claim 5, which is characterized in that the processing module includes:
First acquisition unit, for obtaining the display status image of display screen to be tested；
Down-sampled unit, for carrying out down-sampled processing to the display status image, to generate down-sampled image；
Determination unit, for the down-sampled image to be determined as the initial pictures；
Filter unit, for being filtered the initial pictures to generate filtering image.
7. display screen uniformity test system according to claim 6, which is characterized in that the filter unit includes:
Subelement is obtained, for obtaining preset image filtering template, the size of described image Filtering Template is greater than preset value；
Filtering subunit, for according to described image Filtering Template, to the display status image be filtered process of convolution with
Generate the filtering image.
8. the display screen uniformity test system according to any one of claim 5 to 7, which is characterized in that described right
Include: than image generation module
Second acquisition unit for obtaining the pixel value of each pixel on the initial pictures, and obtains the filtering figure
As the pixel value of upper each pixel；
Difference value computing unit, for the pixel value and the filtering image according to each pixel on the initial pictures
Each pixel pixel value, calculate each pixel on the initial pictures and the respective pixel on the filtering image
The value differences of point；
Average calculation unit, on the pixel value and the filtering image according to each pixel on the initial pictures
The pixel value of each pixel calculates the pixel value mean value of the initial pictures Yu the filtering image；
Contrast images generation unit generates for the ratio according to the value differences and the pixel value mean value and is used for table
Levy the contrast images of the interference pixel value of the initial pictures.
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| CN111982477B (en) * | 2020-08-31 | 2023-04-28 | 合肥维信诺科技有限公司 | Display panel testing method and device |
| CN114445405B (en) * | 2022-04-07 | 2022-07-26 | 中导光电设备股份有限公司 | Method and system for detecting uniformity of circular hole |
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