image processing

hi all

how can i convert 2-D matrix(image) into vector. please reply me.

many thanks

Answer 1

[Sean de Wolski]

 doc reshape
 doc transpose
 doc colon

Answer 2

[Taleb Almajrbi]

hi my answer is Sv1=reshape(F1,size(F1,1)* size(F1,2),1); So is this answer correct? please reply me.

thanks

[Sean de Wolski]

Yes, this is correct. I would do it with numel since that's robust to higher dimensional matrices and faster:

Sv1=reshape(F1,numel(F1),1);

[Sean de Wolski]

Also:

Sv1 = F1(:); %works also.

Answer 3

[Taleb Almajrbi]

Hi All in fact i am doing project of image processing by using fourier trnsform where the 1step: apply the fft2 for the image z1. 2step convert the image into vector to discard half of fourier trnsformed image then show the last image of fourier trnsformed so this my code is it correct? please reply me/ thanks

Ft=fft2(Z1); %apply fourier trnsform function St=abs(Ft);

St1=reshape(Ft,size(Ft,1)* size(Ft,2),1);%convert fourier trnsformed image into vector St2=St1(1:floor(length(St1)/2)); %iscard half of Fourier spectrum

Fct=fftshift(Ft);
F11=log(1+abs(Fct));

subplot(236),imshow(F11, []),title('fft2 image for haning window image');