adjust brightness of an image with respect to another image.

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Elad 2012-6-14

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编辑： px1313 2017-5-2

Is there some automatic function for that, something like imregister only to equalize the brightness between two images ? Thanks.

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Answer 1

Walter Roberson 2012-6-15

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在 MATLAB Online 中打开

The below might not look like it makes the brightnesses of the images the same, but mathematically it does the job, provided that you do not get saturation.

b1 = mean2(rgb2gray(Image1));
b2 = mean2(rgb2gray(Image2));
NewImage2 = Image2 + (b1-b2);

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Elad 2012-6-17

Thanks, unfortunatly that does not work well in my case. perhaps I need some local equalization between the images, the algorithm by Mark Grundland and Neil A. Dodgson that Image Analyst suggested might work.

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Answer 2

Image Analyst 2012-6-17

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For the ultimate in histogram matching of grayscale images, see my histogram matching/shaping routine. http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862 You can't do better since it will provide as exact a match as is theoretically possible. (It's only slightly inexact when the image sizes are different, for obvious reasons. Ask if you don't know why.)

For a color image, I think the algorithm by Mark Grundland and Neil A. Dodgson is possibly the best algorithm out there: http://www.eyemaginary.com/Portfolio/ColorHistogramWarp.html

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Thang Le 2016-2-25

Sorry for digging up an old post. I've looked at the custom-shaped histogram package and I'm not sure how to equalize the brightness and contrast across multiple images. I have 160 images with different levels of brightness and contrast and I would like to create a set of new 160 images from these with the same level of brightness and contrast. Image Analyst, could you help?

Image Analyst 2016-2-26

Try using imhistmatch() in a loop.

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Answer 3

px1313 2017-5-2

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编辑：px1313 2017-5-2

I would like to ask you if imhistmatch() have worked for your 160 images with different levels of brightness and contrast. I have same problem to solve.