I want to compare the 'brightness' of two images using a template image and an image acquired

For the most part looking for suggestions on the best way to go about it. Im trying to run a test that will allow me to compare the brightness of an LCD screen using a webcam. Essentially, I let power on the screen, and from time to time, the screen will be incredibly dim. IM thinking I should be able to use the functionality of the subtraction with both images and if I have a normal screen it should produce a closure to 0 results, while the dark screen should give a non zero value (pixel wise) but have so far not been successful.

http://zone.NI.com/reference/en-XX/help/370281AA-01/imaqvision/imaq_light_meter__point/  I used the rectangle version but this block instead of going with a subtraction! Being new on and auto teaching labview I often oversteps these easy solutions

Tags: NI Software

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