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Difference between two images light independent

asked 2017-10-29 06:43:42 -0500

marcosbontempo gravatar image

Hello,

I'm getting the difference between two images using the absdiff method and aplying a threshold. However, due to light variations, I have to change the threshold value every place I test my system.

Is there an alternative way to get the difference between two images that is light independent?

Any tip will be very helpful,

Thanks

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answered 2017-10-30 06:16:32 -0500

supra56 gravatar image

For python3.5 and OpenCV 3.3.1 on raspberry pi3 using linux. I used createCLAHE and or cv2.equalizeHist or even create function of gamma.

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answered 2017-10-29 14:14:53 -0500

Tetragramm gravatar image

Have you tried normalizing the images by the standard deviation?

Convert them both to the CV_32F type, and calculate the mean and standard deviation of each image. Subtract the mean from each then divide by the stddev.

This is a simple way. If you want to search for more complicated ways, the key terms to use is "illumination invariance". There are a huge number of methods, so good luck.

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Asked: 2017-10-29 06:43:42 -0500

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Last updated: Oct 30 '17