A method and system for detecting LED luminous uniformity

Abstract

The invention discloses an LED luminance uniformity detection method and a system of the LED luminance uniformity detection method. The method comprises the steps that the light spot image of an LED to be detected is obtained; a rectangular box with the center coinciding with the light spot center of the light spot image is arranged, the image gray level of an assigned angle in the rectangular box is obtained, and a gray level distribution curve is obtained according to the image gray level of the assigned angle in the rectangular box; the absolute value of the difference value between a first peak value and a second peak value in the gray level distribution curve is obtained, the absolute value is compared with a preset gray level threshold value, and when the absolute value is smaller or equal to the gray level threshold value, the LED to be detected emits uniform light; when the absolute value is larger than the gray level threshold value, the LED to be detected emits non-uniform light. According to the LED luminance uniformity detection method and the system of the LED luminance uniformity detection method, LED luminance uniformity detection is easier and faster, detection accuracy is high, and large-scale semi-automatic detection can be achieved.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a method and system for detecting uniformity of LED light emission. Background technique [0002] In the direct type backlight design, in order to reduce the number of LEDs and convert the LEDs with point light source characteristics into surface light sources, the combination of LEDs and secondary optical lenses is widely used as the light source. Quality has a great impact, which has become a concern of various manufacturers. [0003] At present, there are two main detection methods for the luminous uniformity of a single LED and lens combination. One is to observe whether the light spots formed on the receiving screen are uniform through human eyes; the other is to use a luminance measuring instrument to measure the luminance values ​​of different points. , to compare whether the brightness values ​​of the points are consistent. However, the existing detection metho...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method and system for detecting LED luminous uniformity in view of the above-mentioned defects of the prior art, aiming at solving the problem that the detection of LED luminous uniformity in the prior art is inefficient and cannot be performed in large quantities. detected defects

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