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| 5 | <title>Description of interp2_uvmat</title> |
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| 15 | <div><a href="../index.html">Home</a> > <a href="index.html">.</a> > interp2_uvmat.m</div> |
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| 18 | <td align="right"><a href="index.html">Index for . <img alt=">" border="0" src="../right.png"></a></td></tr></table>--> |
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| 19 | |
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| 20 | <h1>interp2_uvmat |
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| 21 | </h1> |
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| 22 | |
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| 23 | <h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2> |
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| 24 | <div class="box"><strong>A matrix (npy,npx) to interpolate</strong></div> |
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| 25 | |
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| 26 | <h2><a name="_synopsis"></a>SYNOPSIS <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2> |
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| 27 | <div class="box"><strong>function A_out=interp2_uvmat(A,XIMA,YIMA) </strong></div> |
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| 28 | |
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| 29 | <h2><a name="_description"></a>DESCRIPTION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2> |
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| 30 | <div class="fragment"><pre class="comment"> A matrix (npy,npx) to interpolate |
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| 31 | XIMA: matrix of non-integer x index values (npY,npX) |
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| 32 | YIMA: matrix of non-integer y index values (npY,npX), (with the same size as XIMA)</pre></div> |
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| 33 | |
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| 34 | <!-- crossreference --> |
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| 35 | <h2><a name="_cross"></a>CROSS-REFERENCE INFORMATION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2> |
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| 36 | This function calls: |
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| 37 | <ul style="list-style-image:url(../matlabicon.gif)"> |
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| 38 | </ul> |
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| 39 | This function is called by: |
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| 40 | <ul style="list-style-image:url(../matlabicon.gif)"> |
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| 41 | </ul> |
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| 42 | <!-- crossreference --> |
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| 43 | |
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| 44 | |
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| 45 | <h2><a name="_source"></a>SOURCE CODE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2> |
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| 46 | <div class="fragment"><pre>0001 <span class="comment">% A matrix (npy,npx) to interpolate</span> |
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| 47 | 0002 <span class="comment">%XIMA: matrix of non-integer x index values (npY,npX)</span> |
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| 48 | 0003 <span class="comment">%YIMA: matrix of non-integer y index values (npY,npX), (with the same size as XIMA)</span> |
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| 49 | 0004 <a name="_sub0" href="#_subfunctions" class="code">function A_out=interp2_uvmat(A,XIMA,YIMA)</a> |
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| 50 | 0005 npx=size(A,2); |
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| 51 | 0006 npy=size(A,1); |
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| 52 | 0007 npX=size(XIMA,2); |
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| 53 | 0008 npY=size(XIMA,1) |
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| 54 | 0009 XIMA=reshape(XIMA,1,npX*npY)+0.5;<span class="comment">%indices corresponding to XIMA, reshaped in a matlab vector</span> |
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| 55 | 0010 YIMA=reshape(YIMA,1,npX*npY)+0.5;<span class="comment">%indices corresponding to XIMA, reshaped in a matlab vector</span> |
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| 56 | 0011 X_delta=XIMA-floor(XIMA);<span class="comment">%distance to the closest integer value</span> |
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| 57 | 0012 XIMA=floor(XIMA);<span class="comment">%integer x index on the image</span> |
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| 58 | 0013 Y_delta=YIMA-floor(YIMA);<span class="comment">%distance to the closest integer value</span> |
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| 59 | 0014 YIMA=floor(YIMA);<span class="comment">%integer x index on the image</span> |
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| 60 | 0015 flagin=(XIMA>=1 & XIMA<=npx-1 & YIMA >=1 & YIMA<=npy-1);<span class="comment">%flagin=1 inside the original image</span> |
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| 61 | 0016 ind_in=find(flagin);<span class="comment">%list of indices of XIndex for valid values of image indices (inside the original image)</span> |
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| 62 | 0017 ind_out=find(~flagin); |
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| 63 | 0018 vec_A=double(reshape(A(:,:,1),1,npx*npy));<span class="comment">%reshape the original image as a Matlab image vector</span> |
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| 64 | 0019 ICOMB=((XIMA-1)*npy+(npy+1-YIMA));<span class="comment">%determine the indices in the image Matlab vector corresponding to XIMA and YIMA</span> |
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| 65 | 0020 ICOMB=ICOMB(flagin);<span class="comment">%selection of the valid indices</span> |
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| 66 | 0021 X_delta=X_delta(ind_in); |
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| 67 | 0022 Y_delta=Y_delta(ind_in); |
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| 68 | 0023 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); |
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| 69 | 0024 A_out(ind_out)=zeros(size(ind_out)); |
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| 70 | 0025 A_out=reshape(A_out,npY,npX);<span class="comment">%interpolated image</span></pre></div> |
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| 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> © 2003</address> |
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