Comparing RGB pixel values of two .tiff images

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Vespi 2016-3-3

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https://ww2.mathworks.cn/matlabcentral/answers/271340-comparing-rgb-pixel-values-of-two-tiff-images

评论： Vespi 2016-3-4

I have two TIFF files that represent a region but for two separate years. The TIFF files were downloaded as 1 band, but I converted then to RGB (3 band) via ArcGIS. I have extracted the RGB channels using the code below for both images:

 R1=im1(:,:,1);
G1=im1(:,:,2);
B1=im1(:,:,3);

So now that I have 3 matrices for each image I want to compare the RGB values between the two images (two years). What would be the most efficient way to compare RGB values by pixel between these two images?

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Answer 1

Walter Roberson 2016-3-3

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https://ww2.mathworks.cn/matlabcentral/answers/271340-comparing-rgb-pixel-values-of-two-tiff-images#answer_212215

isequal()

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Vespi 2016-3-4

Thank you Mr. Roberson. I failed to mention that I would like to extract the pixel numbers where the images are different to obtain the rgb values within those pixels. I have a separate file that identifies the type of land use based on RGB code. Could I save these rgb values where there are differences detected in excel?

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Answer 2

Image Analyst 2016-3-3

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https://ww2.mathworks.cn/matlabcentral/answers/271340-comparing-rgb-pixel-values-of-two-tiff-images#answer_212217

在 MATLAB Online 中打开

What does "compare" mean to you? Find the difference? See if they're equal?

diffImage = double(R1) - double(R2);
subplot(1,2,1);
imshow(diffImage, []);
subplot(1,2,2);
notEqual = R1 ~= R2;
imshow(notEqual);

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Vespi 2016-3-4

By compare I mean find the differences between the two images. I would like to extract the pixel numbers where the images are different to obtain the rgb values within those pixels. I have a separate file that identifies the type of land use based on RGB code. Could I save these rgb values where there are differences detected in excel?

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