Spatial Correlation Coefficient between two RGB images

Hello, I'm looking for the function which will help me to find Spatial Correlation Coefficient (SCC) between two RGB images and it will return me one double value. I have two images one is original .tif fille and the second is the same file but compressed with JPG algorithm (Q=30%). Each file is 1024x1360x3 uint8 matrix.

Should I convert the images to gray scale? I tried to do that with this function: im_gray=mat2gray(im); but the image is still three dimensional.

I'd really appreciate your help

Answer 1

[Poorna]

Hi Julia Merta,

I understand that you would like to find SCC between two RGB Images. First, An RGB Image can be converted to gray scale using the rgb2gray function.

After this, corr2 can be used to find the correlation coefficient between the two images.

In short you can do this.

im1 = imread('image1.jpg');  
im2 = imread('image2.jpg');  
im1_gray = rgb2gray(im1);  
im2_gray = rgb2gray(im2); 
result = corr2(im1_gray, im2_gray); 

Hope this helps!