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Luminance uniformity test method of dot-matrix light source

A test method and technology for uniform light emission, applied in the direction of testing optical properties, etc., can solve the problem that the evaluation of light emission uniformity of dot matrix light sources is not comprehensive and accurate, does not distinguish light-emitting points and non-light-emitting areas, and does not comprehensively evaluate light-emitting uniformity, etc. problems, to achieve the effect of objective test results, more test methods, and comprehensive test methods

Inactive Publication Date: 2015-05-27
GUANGXI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, the above methods are all directly testing the acquired images, without correcting the geometric distortion of the image caused by shooting; nor distinguishing between luminous points and non-luminous areas, and including those non-luminous areas that should not participate in the evaluation are also included in the evaluation scope; and , or only test the uniformity of brightness, or only test the uniformity of distribution, which is one-sided and does not comprehensively evaluate the uniformity of light emission; the above deficiencies lead to an incomplete and accurate evaluation of the uniformity of light emission of dot matrix light sources.

Method used

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0029] Such as figure 1 Shown, the specific steps of this embodiment are:

[0030] Use the camera head 2 to shoot the light-emitting process of the dot matrix light source 1, transmit the video to the computer 3 through the USB interface of the computer 3, and then intercept the light-emitting image of the dot-matrix light source 1 from the video, and select a rectangular area to be tested in the light-emitting image ,Such as figure 2 shown; the image of the rectangular area to be tested is corrected for geometric distortion to generate a test image, such as image 3 shown; read the grayscale value of each pixel in the test image; set the image grayscale fluctuation allowable value Tc, if the grayscale difference between a certain pixel and the adjacent 8 pixels is less than Tc, it is determined that the grayscale change is Caused by noise, the gray value of t...

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Abstract

The invention discloses a luminance uniformity test method of a dot-matrix light source, and relates to the technical fields of display, illumination and image processing. According to the luminance uniformity test method, the luminance uniformity is divided into brightness uniformity and distribution uniformity; the luminance uniformity of the dot-matrix light source is evaluated through the brightness uniformity, the distribution uniformity and the sum of the brightness uniformity and the distribution uniformity; in the testing process, image geometric distortion is corrected; the dot-matrix structure is analyzed, and the non-light-emitting area is excluded from the evaluation range. Compared with the existing test method, the luminance uniformity test method is more comprehensive, objective, accurate, effective, direct, simple and convenient.

Description

technical field [0001] The invention relates to the fields of display, illumination light source and computer image processing, in particular to a test method for a dot matrix light source. Background technique [0002] A dot matrix light source refers to a collection of multiple active light-emitting points arranged in an orderly manner in rows and columns. The device types of the light source include LCD, LED, FED, and PDP. With the rapid development of information technology, point-matrix light sources have been widely used in terminals of various multimedia devices. It can be used as a lighting source and backlight, and can also be used for screens that display various information such as characters, graphics, and videos. The brightness uniformity of a dot matrix light source is an important factor affecting its lighting or display performance, so it is very necessary to propose an effective test method for the brightness uniformity of a light source to provide guidance...

Claims

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Application Information

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IPC IPC(8): G01M11/02
Inventor 李政林盘荣俊薛春华刘青正张玉薇
Owner GUANGXI UNIVERSITY OF TECHNOLOGY
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