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19
20<h1>interp2_uvmat
21</h1>
22
23<h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
24<div class="box"><strong>A matrix (npy,npx) to interpolate</strong></div>
25
26<h2><a name="_synopsis"></a>SYNOPSIS <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
27<div class="box"><strong>function A_out=interp2_uvmat(A,XIMA,YIMA) </strong></div>
28
29<h2><a name="_description"></a>DESCRIPTION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
30<div class="fragment"><pre class="comment"> A matrix (npy,npx) to interpolate
31XIMA: matrix of non-integer x index values (npY,npX)
32YIMA: matrix of non-integer y index values (npY,npX), (with the same size as XIMA)</pre></div>
33
34<!-- crossreference -->
35<h2><a name="_cross"></a>CROSS-REFERENCE INFORMATION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
36This function calls:
37<ul style="list-style-image:url(../matlabicon.gif)">
38</ul>
39This function is called by:
40<ul style="list-style-image:url(../matlabicon.gif)">
41</ul>
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43
44
45<h2><a name="_source"></a>SOURCE CODE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
46<div class="fragment"><pre>0001 <span class="comment">% A matrix (npy,npx) to interpolate</span>
470002 <span class="comment">%XIMA: matrix of non-integer x index values (npY,npX)</span>
480003 <span class="comment">%YIMA: matrix of non-integer y index values (npY,npX), (with the same size as XIMA)</span>
490004 <a name="_sub0" href="#_subfunctions" class="code">function A_out=interp2_uvmat(A,XIMA,YIMA)</a>
500005 npx=size(A,2);
510006 npy=size(A,1);
520007 npX=size(XIMA,2);
530008 npY=size(XIMA,1)
540009 XIMA=reshape(XIMA,1,npX*npY)+0.5;<span class="comment">%indices corresponding to XIMA, reshaped in a matlab vector</span>
550010 YIMA=reshape(YIMA,1,npX*npY)+0.5;<span class="comment">%indices corresponding to XIMA, reshaped in a matlab vector</span>
560011 X_delta=XIMA-floor(XIMA);<span class="comment">%distance to the closest integer value</span>
570012 XIMA=floor(XIMA);<span class="comment">%integer x index on the image</span>
580013 Y_delta=YIMA-floor(YIMA);<span class="comment">%distance to the closest integer value</span>
590014 YIMA=floor(YIMA);<span class="comment">%integer x index on the image</span>
600015 flagin=(XIMA&gt;=1 &amp; XIMA&lt;=npx-1 &amp; YIMA &gt;=1 &amp; YIMA&lt;=npy-1);<span class="comment">%flagin=1 inside the original image</span>
610016 ind_in=find(flagin);<span class="comment">%list of indices of XIndex for valid values of image indices (inside the original image)</span>
620017 ind_out=find(~flagin);     
630018 vec_A=double(reshape(A(:,:,1),1,npx*npy));<span class="comment">%reshape the original image as a Matlab image vector</span>
640019 ICOMB=((XIMA-1)*npy+(npy+1-YIMA));<span class="comment">%determine the indices in the image Matlab vector corresponding to XIMA and YIMA</span>
650020 ICOMB=ICOMB(flagin);<span class="comment">%selection of the valid indices</span>
660021 X_delta=X_delta(ind_in);
670022 Y_delta=Y_delta(ind_in);
680023 A_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);
690024 A_out(ind_out)=zeros(size(ind_out));
700025 A_out=reshape(A_out,npY,npX);<span class="comment">%interpolated image</span></pre></div>
71<hr><address>Generated on Fri 13-Nov-2009 11:17:03 by <strong><a href="http://www.artefact.tk/software/matlab/m2html/">m2html</a></strong> &copy; 2003</address>
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