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Re: How to calculate the angle between two images?
Posted:
Apr 5, 2009 10:15 AM
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"khoo" <jim_khoo@hotmail.com> wrote in message <grad5q$cai$1@fred.mathworks.com>...
> below is the function i try to convert the image to 1 Dimensional matric
> function b=transform(a)
>
> [row,column]=size(a);
> b=[];
>
> for i=1:row
> for j=1:column
> b=[b a(i,j)];
> end
> end
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
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