CN104658461A - Method for testing light emission uniformity of display - Google Patents
Method for testing light emission uniformity of display Download PDFInfo
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- CN104658461A CN104658461A CN201410044023.2A CN201410044023A CN104658461A CN 104658461 A CN104658461 A CN 104658461A CN 201410044023 A CN201410044023 A CN 201410044023A CN 104658461 A CN104658461 A CN 104658461A
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Abstract
The invention discloses a method for testing the light emission uniformity of a display. The method comprises the following steps: displaying an acquired image of a display screen through a computer, and selecting a testing area of the image; dividing hot spot pixels and background pixels of the testing area of the image according to a set gray level threshold; setting a selected area window array with a plurality of arranged identical selected area windows in the testing area of the image, and sleeving margins corresponding to different light emitting units of the display in the image testing area by different selected area windows of the selected window array; reading and calculating the ratios of the hot spot pixels of different selected area window images in the image testing area to all pixels, and the average gray level value of the pixels of different selected area windows, thereby calculating the light emission uniformity of the display. By adopting the method, the influence of part outside the light emitting unit area to the evaluation of the light emitting units can be avoided, and the light emission uniformity of the light emitting units of the display can be relatively objectively detected and evaluated.
Description
Technical field
The present invention relates to display manufacturing and Computer Applied Technology field, especially a kind of computing machine that adopts is to the detection method of display lighting performance.
Background technology
Display refer to by row with the set of multiple active illuminating points of row ordered arrangement, the type of device of its light source comprises liquid crystal display (LCD), light emitting diode indicator (LED), Field Emission Display (FED) and plasma panel (PDP) etc.Along with the fast development of infotech, display has been widely used in the terminal of all kinds of multimedia equipment.It can be used as lighting source and backlight, also may be used for the screen showing the various information such as character, figure and video.The brightness uniformity of display affects its illumination or key factor of display performance, is therefore necessary very much to propose effective method of testing to the brightness uniformity of light source, for the production of related device and research and development provide guidance.
Current employing method of testing mainly adopts brightness instrument to randomly draw some sampled points to display and tests its brightness value, then final assessment result is obtained by certain algorithm, this method has one-sidedness, and each measurement can only obtain the data of a sampled point, obtain test result to need repeatedly to regulate testing tool, consuming time more.Have report to be obtained the monochrome information of lattice pixels by sensor, combining image treatment technology and Principle of Statistics, fit to normal distribution curve by the grey level histogram of pixel, utilizes standard deviation to evaluate brightness uniformity.The luminance picture also having report to propose sensor obtains is divided into some subregions, calculate all subregion based on HVS(human-eye visual characteristic) the brightness factor, the locus Summing Factor grain details factor, by the feature of these factors as the evaluating of subregion, then evaluate the brightness uniformity of light source by the dispersion degree value of all subregion parameter.But above method is all directly test the image obtained, do not correct taking the piecture geometry fault caused; Do not distinguish luminous point and non-luminous region, those non-luminous regions that should not participate in evaluating also are included in range of value yet; Further, or be a test brightness homogeneity, or only test distributing homogeneity, there is one-sidedness, do not evaluate uniformity of luminance all sidedly; Above deficiency causes the evaluation of display lighting homogeneity not accurate enough.
Summary of the invention
Problem to be solved by this invention is to provide a kind of method of testing of display lighting homogeneity, can the method for detecting and assessing display lighting unit uniformity of luminance comparatively objectively.
In order to solve the problem, technical scheme of the present invention is: the method for testing of this display lighting homogeneity comprises the following steps:
A. shooting obtains the required image detecting position of complete bright status displays;
B. the image obtained is passed through Computer display out, and choose test zone in described image;
C. read the gray-scale value of each pixel in described image measurement region, and go out speck pixel and background pixel according to the gray level threshold segmentation of setting;
D. a constituency window array be made up of multiple identical constituencies window is set in described image measurement region, adjust the shape of constituency window in the window array of described constituency, size and array parameter, make the window cover residence, each constituency in the window array of described constituency state the position of image measurement region each luminescence unit of previous generation's table display corresponding site;
E. read and to calculate on described image measurement region speck pixel in each constituency video in window and account for the ratio of the constituency window speck pixel of whole pixel, and each constituency window pixel average gray, the uniformity of luminance of calculation display is carried out by the ratio of each constituency window speck pixel in described image measurement region and pixel grey scale mean value.
In the method for testing of above-mentioned display lighting homogeneity, when taking the image obtained and there is len distortion, before entering step c, the image of acquisition can be carried out deformity correction to the distortion caused in shooting.
Owing to have employed technique scheme, the present invention compared with prior art has following beneficial effect: can separate representing luminescence unit part and non-luminescent unit position in display, the luminescence unit part that only test should be luminous, like this can the uniformity of luminance at more accurate evaluation display lighting position objectively.
Embodiment
Below in conjunction with example, the present invention is described in further details.
Embodiment 1---the method for testing of Field Emission Display screen central part uniformity of luminance:
The first step: with the one section video image of camera shooting Field Emission Display screen central part under complete bright state, intercepts a wherein frame in a computer and shields the sample image of central part uniformity of luminance as this Field Emission Display of evaluation and test;
Work out the evaluation program that is applied to computing machine, this evaluation program has following functions:
Open in a computer and show image, the gray-scale value of each pixel of reading displayed image, and going out speck pixel and background pixel according to the gray level threshold segmentation of setting;
Generate the vector graphics that multiple constituencies window is arrayed in a computer, constituency window array Parameter adjustable, the shape of each constituency window is identical with size, and constituency window can be set to the shapes such as the circle of size adjustable, ellipse, square or rectangle by choosing different parameters;
Vector graphics is compound on shown image, and read the gray-scale value of each pixel in each constituency window, calculate the ratio of speck pixel at constituency window, whether be effective luminescence unit, and calculate the distributing homogeneity numerical value of effective luminescence unit number and effective luminescence unit according to the ratio of effective luminescence unit and distribution if offering an explanation out constituency window according to speck pixel rate optimum configurations in the window of each constituency; The homogeneity of the average gray of constituency window, constituency window gray values tolerance and gray scale is calculated by the gray-scale value calculating each constituency window.
Second step: run above-mentioned evaluation program in a computer, and open and show gained sample image, choosing the rectangular area that length and width in image pattern is 5 luminescence units is test zone; The feature rounded according to sample image midfield emission display screen luminescence unit, choose the shape of constituency window for circular, and by the parameter of polygon constituency window size and the adjustment of constituency window array parameter, make each constituency window just in time frame in sample image, represent Field Emission Display shield in the edge of 25 luminescence unit positions; Press the calculation key of evaluation program, the gray-scale value of each pixel of test zone in sample image is first carried out reading and analyzes by evaluation program, gray-scale value threshold value in artificial setting evaluation program, full bright values gray-scale value is 255, full grey black angle value is 0, gray-scale value threshold value is set to 150, then gray-scale value reach 150 and above pixel be judged to be speck pixel, the pixel that gray-scale value does not reach 150 is judged to be background pixel; Calculate the accounting of speck pixel in each constituency window, the constituency window that the accounting of speck pixel reaches more than 60% is judged to be that the luminescence unit of Field Emission Display screen representated by this constituency window is effective luminescence unit, the constituency window that the accounting of speck pixel is less than 60% is judged to be that the luminescence unit of Field Emission Display screen representated by this constituency window is invalid luminescence unit, and evaluation program draws effective luminescence unit ratio of the Field Emission Display screen central part representated by sample image according to effective luminescence unit quantity statistics in the test; Evaluation program also calculates the average gray of pixel in the window of each constituency by the gray-scale value reading each pixel in the window of each constituency, add up the average gray of pixel in the window of each constituency, calculate the gray-scale value tolerance of effective luminescence unit of the Field Emission Display screen central part representated by sample image, evaluate the gray-scale value homogeneity of luminescence unit according to this tolerance value.
Embodiment 2---the method for testing of Field Emission Display screen position, upper right corner uniformity of luminance
The first step: with the one section video image of camera shooting Field Emission Display screen position, the upper right corner under complete bright state, intercepts a wherein frame in a computer and shields the sample image of the uniformity of luminance at position, the upper right corner as this Field Emission Display of evaluation and test;
Second step: carry out deformity correction to sample image to the anamorphose caused in shooting with image processing software, makes to reflect in sample image that the position between each luminescence unit meets the real conditions of corresponding luminescence unit position in Field Emission Display screen;
3rd step: run evaluation program described in embodiment 1 in a computer, and open and show and carried out the sample image after deformity correction process through second step, choosing the rectangular area that length and width in image pattern is 5 luminescence units is test zone; The feature rounded according to sample image midfield emission display screen luminescence unit, choose the shape of constituency window for circular, and by the parameter of polygon constituency window size and the adjustment of constituency window array parameter, make each constituency window just in time frame in sample image, represent Field Emission Display shield in the edge of 25 luminescence unit positions; Press the calculation key of evaluation program, the gray-scale value of each pixel of test zone in sample image is first carried out reading and analyzes by evaluation program, gray-scale value threshold value in artificial setting evaluation program, full bright values gray-scale value is 255, full grey black angle value is 0, gray-scale value threshold value is set to 150, then gray-scale value reach 150 and above pixel be judged to be speck pixel, the pixel that gray-scale value does not reach 150 is judged to be background pixel; Calculate the accounting of speck pixel in each constituency window, the constituency window that the accounting of speck pixel reaches more than 60% is judged to be that the luminescence unit of Field Emission Display screen representated by this constituency window is effective luminescence unit, the constituency window that the accounting of speck pixel is less than 60% is judged to be that the luminescence unit of Field Emission Display screen representated by this constituency window is invalid luminescence unit, and evaluation program draws effective luminescence unit ratio at the Field Emission Display screen position, the upper right corner representated by sample image according to effective luminescence unit quantity statistics in the test; Evaluation program also calculates the average gray of pixel in the window of each constituency by the gray-scale value reading each pixel in the window of each constituency, add up the average gray of pixel in the window of each constituency, calculate the gray-scale value tolerance of the effective luminescence unit in Field Emission Display screen position, the upper right corner representated by sample image, evaluate the gray-scale value homogeneity of luminescence unit according to this tolerance value.
Claims (2)
1. a method of testing for display lighting homogeneity, is characterized in that comprising the following steps:
A. shooting obtains the required image detecting position of complete bright status displays;
B. the image obtained is passed through Computer display out, and choose test zone in described image;
C. read the gray-scale value of each pixel in described image measurement region, and go out speck pixel and background pixel according to the gray level threshold segmentation of setting;
D. a constituency window array be made up of multiple identical constituencies window is set in described image measurement region, adjust the shape of constituency window in the window array of described constituency, size and array parameter, make the window cover residence, each constituency in the window array of described constituency state the position of image measurement region each luminescence unit of previous generation's table display corresponding site;
E. read and to calculate on described image measurement region speck pixel in each constituency video in window and account for the ratio of the constituency window speck pixel of whole pixel, and each constituency window pixel average gray, the uniformity of luminance of calculation display is carried out by the ratio of each constituency window speck pixel in described image measurement region and pixel grey scale mean value.
2. the method for testing of display lighting homogeneity according to claim 1, is characterized in that: before entering c step, and the image of acquisition is carried out deformity correction to the distortion caused in shooting.
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| CN109599050A (en) * | 2019-01-31 | 2019-04-09 | 合肥鑫晟光电科技有限公司 | A kind of display panel method for improving image quality and its device, display device |
| CN110398344A (en) * | 2019-08-23 | 2019-11-01 | Tcl王牌电器(惠州)有限公司 | A kind of detection method, appliance arrangement and storage medium showing equipment backlight luminous board |
| CN111609998A (en) * | 2020-05-11 | 2020-09-01 | 歌尔股份有限公司 | Detection method and detection device for illumination uniformity and readable storage medium |
| CN113776787A (en) * | 2021-09-27 | 2021-12-10 | 歌尔光学科技有限公司 | Screen uniformity testing method and system of virtual reality equipment and related device |
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| CN113776787A (en) * | 2021-09-27 | 2021-12-10 | 歌尔光学科技有限公司 | Screen uniformity testing method and system of virtual reality equipment and related device |
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