How To Measure Contrast in OpenCV + Visual C++

Question

The question was previously \"How to select image of best contrast in OpenCV\" but as per @Rook\'s suggestion, I\'m changing it.

I am going to use OpenCV + Visual Studio

Answer 1

Entropy of image is used as a measure of contrast. See this code.

Entropy is a scalar value, statistical measure of randomness that can be used to characterize the texture of the input image. Entropy is defined as

-sum(p.*log2(p))

where p contains the histogram counts.

— Matlab documentation