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Method of measuring luminance of LED

Method of measuring luminance of LED

Answer:

The commonly used imaging luminance meter and shade tube type luminance meter; imaging luminance meter is our common color brightness meter and color luminance meter. Often used in the brightness test of the LED display, it can only test the brightness values of the smaller areas of the LED display.
Luminance meter using CCD technology. The use of CCD LED data acquisition display gray, it improves the defects of the previous two luminance meter cannot measure large luminance source, good real-time performance, can obtain a large amount of information, each pixel gray level imaging can be LED display on the CCD value. However, this gray value can not be equal to the actual brightness value, and even lacks strict linear relationship with the brightness value.
Using CCD pixel gray measurement system, the main principle is to use CCD to capture the image of LED display, and then image processing technology to process the image, extract the gray value of each pixel of the LED display. Thus, the relative brightness values of each pixel of the LED display screen are calculated

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