# source:trunk/src/private/interp2_uvmat.m@8

Last change on this file since 8 was 8, checked in by gostiaux, 14 years ago
File size: 1.5 KB
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1% A matrix (npy,npx) to interpolate
2%XIMA: matrix of non-integer x index values (npY,npX)
3%YIMA: matrix of non-integer y index values (npY,npX), (with the same size as XIMA)
4function A_out=interp2_uvmat(A,XIMA,YIMA)
5npx=size(A,2);
6npy=size(A,1);
7npX=size(XIMA,2);
8npY=size(XIMA,1)
9XIMA=reshape(XIMA,1,npX*npY)+0.5;%indices corresponding to XIMA, reshaped in a matlab vector
10YIMA=reshape(YIMA,1,npX*npY)+0.5;%indices corresponding to XIMA, reshaped in a matlab vector
11X_delta=XIMA-floor(XIMA);%distance to the closest integer value
12XIMA=floor(XIMA);%integer x index on the image
13Y_delta=YIMA-floor(YIMA);%distance to the closest integer value
14YIMA=floor(YIMA);%integer x index on the image
15flagin=(XIMA>=1 & XIMA<=npx-1 & YIMA >=1 & YIMA<=npy-1);%flagin=1 inside the original image
16ind_in=find(flagin);%list of indices of XIndex for valid values of image indices (inside the original image)
17ind_out=find(~flagin);
18vec_A=double(reshape(A(:,:,1),1,npx*npy));%reshape the original image as a Matlab image vector
19ICOMB=((XIMA-1)*npy+(npy+1-YIMA));%determine the indices in the image Matlab vector corresponding to XIMA and YIMA
20ICOMB=ICOMB(flagin);%selection of the valid indices
21X_delta=X_delta(ind_in);
22Y_delta=Y_delta(ind_in);
23A_out(ind_in)=(1-Y_delta).*(1-X_delta).*vec_A(ICOMB)+Y_delta.*(1-X_delta).*vec_A(ICOMB-1)+X_delta.*(1-Y_delta).*vec_A(ICOMB+npy)+X_delta.*Y_delta.*vec_A(ICOMB+npy-1);
24A_out(ind_out)=zeros(size(ind_out));
25A_out=reshape(A_out,npY,npX);%interpolated image
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