MATLAB Central Newsreader - image correlation matching

image correlation matching

Eihab — Fri, 03 Apr 2009 13:15:03 -0400

i try to perform matching correlation in the frequency domain between two images(date base images of road & stop sign template )
i try to find the location of the 'stop sign template' inside the database images using FFT's.
This is my code :
stop = imread('stop2.jpg');
imshow(stop)
st1 = rgb2gray(stop);
figure,imshow(st1)
temp1 = st1(299:376,110:177);
figure,imshow(temp1);
[m,n]=size(st1)
C = real(ifft2(fft2(double(st1)) .* fft2(rot90(double(temp1),2),m,n)));
figure,imshow(C,[])
mx=max(C(:))
thresh = mx-10
figure,imshow(C> thresh)
% End of the code .
anybody help me & tell me the correct way to use fft2 function to make correlation between two images ?!

Re: image correlation matching

J.Meyer — Mon, 20 Apr 2009 18:07:20 -0400

On Apr 3, 9:15=A0am, "Eihab " <Eihaab1...@yahoo.com> wrote:
> i try to perform matching correlation in the frequency domain between two=
images(date base images of road =A0& stop sign template )
> i try to find the location =A0of the 'stop sign template' inside the data=
base images using FFT's.
> This is my code :
> stop =3D imread('stop2.jpg');
> imshow(stop)
> st1 =3D rgb2gray(stop);
> figure,imshow(st1)
> temp1 =3D st1(299:376,110:177);
> figure,imshow(temp1);
> [m,n]=3Dsize(st1)
> C =3D real(ifft2(fft2(double(st1)) .* fft2(rot90(double(temp1),2),m,n)));
> figure,imshow(C,[])
> mx=3Dmax(C(:))
> thresh =3D mx-10
> figure,imshow(C> thresh)
> % End of the code .
> anybody help me & tell me the correct way to use fft2 function to make co=
rrelation between two images ?!

Any responses to this? I am in a similar situation.

Re: image correlation matching

Prasanna — Mon, 09 Nov 2009 11:37:02 -0500

I'm also in this situation.But i am having binary image and binary template. Please reply to this.