How can I compare two image with ignore the brightness in C#

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I want to make a program that can compare two image but ignore the brightness which may cause by sunlight.
is there any library or method to do that?

What I have tried:

I have tried to compare two image by comparing the pixel, but it will not ignore the brightness.

Posted 3-Apr-18 17:33pm

alpacaheng

Updated 4-Apr-18 1:45am

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Afzaal Ahmad Zeeshan 4-Apr-18 7:03am

Perhaps you would need to go down to grayscale and then compare them? It sounds almost impossible to ignore the brightness.

Here is a sample thread that might help you out in doing a high-pass filter and then comparison, https://stackoverflow.com/questions/14434426/image-comparison-algorithm-that-ignores-brightness

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Maciej Los · Accepted Answer · 2018-04-04T01:47:00

Solution 1

There is several methods, for example:
1. Keypoint Matching
2. Histogram method
3. Keypoints + Decision Trees
4. file-hash based (md5,sha1,etc) for exact duplicates
5. perceptual hashing (phash) for rescaled images
6. feature-based (SIFT) for modified images
For further details, please see: Image comparison - fast algorithm[^]

It depends on what you mean by "compare two images"...

For starters, i'd suggest to read this excellent CP's article: Simple image comparison in .NET[^]

Posted 4-Apr-18 1:47am

Maciej Los

Comments

Graeme_Grant 4-Apr-18 10:41am

5'ed!

Maciej Los 4-Apr-18 11:35am

Thank you, Graeme.

Graeme_Grant 4-Apr-18 11:41am

It was basically the answer & links that I was going to give ;)

Maciej Los 4-Apr-18 11:46am

I'm glad i was first...
:laugh: