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这是一个有关matlab的中值滤波的程序

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<tbody><tr><td class="headercell" height="20" width="70%">&nbsp;Median filtering&nbsp;
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            <td valign="top" width="89"><b>Author:</b></td>
            <td colspan="2"><a href="http://www.mathworks.com/matlabcentral/fileexchange/loadAuthor.do?objectType=author&amp;objectId=1097230">Damien&nbsp;Garcia</a></td>
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            <td height="15" valign="top" width="89"><b>Summary:</b></td>
            <td colspan="2" height="15">1D, 2D or 3D median filtering</td>
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            <td height="15" valign="top" width="10">&nbsp;</td>
            <td height="15" valign="top" width="125"><b>MATLAB Release:</b></td>
            <td colspan="2" height="15" valign="bottom">R2006b</td>
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            <td valign="top" width="135"><b>Description:</b></td>
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Median filtering is particularly useful to reduce speckle and salt and
pepper noises. Its edge-preserving nature makes it useful in cases
where edge blurring is undesirable.<br>
<br>
B = MEDFILT3(A,[M N P]) performs median filtering of the 3-D array A.
Each output pixel contains the median value in the M-by-N-by-P
neighborhood around the corresponding pixel in the input array.<br>
<br>
B = MEDFILT3(A,[M N]) performs median filtering of the matrix A.<br>
 <br>
B = MEDFILT3(A,M) performs median filtering of the vector A.<br>
 <br>
B = MEDFILT3(A) performs median filtering using a 3 or 3x3 or 3x3x3 neighborhood according to the size of A.<br>
 <br>
B = MEDFILT3(A,...,PADOPT) pads array A using PADOPT option (see help
text). If PADOPT is a scalar, A is padded with this scalar.<br>
 <br>
Notes<br>
-----<br>
M, N and P must be odd integers. If not, they are incremented by 1.<br>
 <br>
If you work with very large 3D arrays, an "Out of memory" error may
appear. The chunk factor (CHUNKFACTOR, default value = 1) must be
increased to reduce the size of the chunks. Use the following syntax:
MEDFILT3(A,[...],PADOPT,CHUNKFACTOR)<br>
<br>
MEDFILT3 (v2.0) now accepts 1D, 2D and 3D arrays.  <br>
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              <td width="286"> <b class="feh4blk"> File Details</b></td>
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            <td valign="top" width="25%"><b>File Id:</b></td>
            <td width="20%">18081</td>
            <td valign="top" width="25%"><b>Average rating:</b></td>
            <td width="29%">5.0</td>
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            <td valign="top">&nbsp;</td>
            <td valign="top"><b>Size:</b></td>
            <td>6 KB</td>
            <td valign="top"><b># of reviews:</b></td>
            <td>1</td>
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            <td valign="top">&nbsp;</td>
            <td valign="top"><b>Submitted:</b></td>
            <td>2007-12-20</td>
            <td valign="top"><b>Downloads:</b></td>
            <td>140</td>
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            <td valign="top"><b>Subscribers:</b></td>
            <td>0</td>
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            <td>&nbsp;</td>
            <td valign="top"><b>Keywords:</b></td>
            <td colspan="3" valign="top">median, filter, filtering, noise, 3D, 3-D, 2D, 2-D, 1D, 1-D</td>
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