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How to do correlation between two tiff image files?

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Thara C.S
Thara C.S 2019-3-7
评论： Image Analyst 2020-3-16
Find the pixel-wise correlation between two tiff images and store it in a matrix?

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回答（2 个）

KALYAN ACHARJYA
KALYAN ACHARJYA 2019-3-7
编辑：madhan ravi 2019-3-7
im1=imread('image1.tif');
im2=imread('image2.tif');
result=corr2(im1,im2);
Note: If the input images are RGB, convert both images in gray and apply corr2.
Please ensure that both images having same size.
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KALYAN ACHARJYA
KALYAN ACHARJYA 2019-3-8
Direct corelation gives a number, if you are looking for matrics, please look on Correlation coefficients
im1=double(rgb2gray(imread('21_training.tif')));
im2=double(rgb2gray(imread('25_training.tif')));
R=corrcoef(im1,im2)
R =
1.0000 0.9419
0.9419 1.0000
But I dont know wheather it serves the main objective of your problem or not?
You can find the corrcoef of single matrix, which returns a matrix of coefficients.
im1=double(gray_image);
R=corrcoef(im1)
Thara C.S
Thara C.S 2019-3-11
but,
i need a graphical representation of pixel wise correlation between two tiif images?

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Image Analyst
Image Analyst 2019-3-11
Try xcorr2():
correlationImage = xcorr2(image1, image2);
imshow(correlationImage, []);
It will give an image of the spatial correlation of image1 with image2. From that you can get profiles if you want.
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Image Analyst
Image Analyst 2020-3-16
You can use imwrite(). If correlationImage is double, then convert to uint8 and then call imwrite():
uint8Image = uint8(mat2gray(correlationImage));
imwrite(uint8Image, fileName);

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