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hi.. i am currently working on an image recognition. i am using fft2 to find correlation value between 2 image. lets say i have an image of an object and a matching template. when i use fft2, why is it, in the correlation matriks, the highest correlation value is not is the centerof the object ? but rather offset to the lower right. these are the command i use : i = imread('object.bmp'); j = imread('template.bmp'); [m n] = size(i); corrmat = real(ifft2(fft2(i) .* fft(rot90(j,2),m,n)); imshow(corrmat,[]); % -> offset to the lower right ??? anyone can explain this to me ? thanks. |
Help - template matching using FFT2
Started by ●June 23, 2003
