> Why on earth are you trying to convert an image into a 1 dimensional vector? you are correlating 2 histograms - histograms are essentially graphs - in your case angle along the x axis, number of pixels of that angle in y direction. If you have say 256 angles, then each bin represents (2*pi)/256 radians. Thus the histogram will be a vector of 256 numbers, each number representing the number of pixels of that angle. > > I suggest you carefully read help hist(), doesn't that default to 10 bins - you will need to have much better resolution than that. > > I have had a look at your images, and would have thought they were ideally suited to this methodology. > > Regards > > Dave Robinson
Bro Dave, this is my code currently...and i ady change the hist not to default 10 binsand set to 256..
just now i check all the histogram for the im11111 and im22222..all is correct..but once i fft the both histograms..when i inverse the FFT..the histogram cannot inverse and still stay in FFt mode...can you help me check my code got any problem ? and teach me how to fix the problem..so far i find the peak is at left side which is after FFT..