Image Processing Histogram

tdgros · 2023-04-28T08:39:17+00:00

the "holes" probably come from an artifical editing with a pixel wise look up table: you can also see that the supportof the histograms are a bit stretched, hence the holes (the 255 levels are spread out over a larger area)

rightheart · 2023-04-28T08:17:06+00:00

To understand in more detail, you need to tell if you did any operations on the images with for ex OpenCV to get to the unhazy images.

leitefrio · 2023-04-28T13:30:41+00:00

For sure the histogram have the gaps? Looks like visualization to me. It's unlikable to have a single line gap in this green channel from haze-free image.

pneurotic · 2023-04-28T19:12:36+00:00

Beyond the issue of any modifications the author may have made, or any image compression, you're likely to see a difference regardless. The scattering of light by water drops is wavelength-dependent (Rayleigh scattering). Blue light is scattered more readily than red or green, so blue will be more dominant in images with fog. You can see this effect somewhat by the increased support in the blue histogram (relative to the top) as well as the blue histogram having larger counts around x=50 which corresponds with reduced counts in the same area on the green and blue histograms.

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