tracking correlation coefficient (linear and non-linear) between two images
조회 수: 1 (최근 30일)
이전 댓글 표시
When I apply corr2 to two similar images (delay between two consecutive images of 1s) it gives correlation coef. close to 0.99 but when I use corr2 for two similar flat field normalized images (delay around 1s between the images) correlation coef. is close to 0. Why is that? Do I have any options other than the built-in corr2 to determine the degree of correlation between two images? I would like to try several approaches to track the correlation between two images (linear and non-linear correlation).
댓글 수: 0
답변 (1개)
Anand
2013년 4월 25일
You're probably making a mistake with the normalization.
Here's an example that doesn't change the correlation coefficient:
im1 = imread('cameraman.tif');
im2 = imnoise(im1,'gaussian');
corr2(im1,im2) %0.9286
im1n = double(im1)./sum(sum(double(im1)));
im2n = double(im2)./sum(sum(double(im2)));
corr2(im1n,im2n) %0.9286
참고 항목
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!