Daniel Reetz, the founder of the DIY Book Scanner community, has recently started making videos of prototyping and shop tips. If you are tinkering with a book scanner (or any other project) in your home shop, these tips will come in handy. https://www.youtube.com/channel/UCn0gq8 ... g_8K1nfInQ

Flat fields to correct for uneven illumination -- has anyone tried this?

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Mohib
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Flat fields to correct for uneven illumination -- has anyone tried this?

Post by Mohib » 16 Apr 2017, 22:45

There is a well known process -- flat fielding -- that is used to correct for uneven illumination in images in scientific and astronomical images. See here:

http://imagej.net/Image_Intensity_Proce ... correction

I'm wondering if anyone has tried this method to eliminate or reduce illumination gradients that many lighting configurations? I'm sure it is a very compute intensive process but is something that could be useful when it's important to get evenly lit images and lighting is not optimal.

mera461
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Re: Flat fields to correct for uneven illumination -- has anyone tried this?

Post by mera461 » 18 Apr 2017, 16:15

You could try CLAHE (Contrast Limited Adaptive Histogram Equalization). With OpenCV it is 6 lines of python: https://opencv-python-tutroals.readthed ... ation.html

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