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117 lines
3.8 KiB
117 lines
3.8 KiB
9 years ago
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/** @file */
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/* The MIT License
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*
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* Copyright (c) 2008, Naotoshi Seo <sonots(at)sonots.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef CV_ANGLEMEAN_INCLUDED
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#define CV_ANGLEMEAN_INCLUDED
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#include "cv.h"
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#include "cvaux.h"
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#include "cxcore.h"
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#include <float.h>
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#define _USE_MATH_DEFINES
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#include <math.h>
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/**
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* Compute mean of angle elements of an array (each channel independently).
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*
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* There is a fact that 0 degrees and 360 degrees are identical angles,
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* so that for example 180 degrees is not a sensible mean of 2 degrees and
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* 358 degrees, but 0 degree is the mean.
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* Algorithm works as 1. compute means of cosine and sine
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* 2. take arc tangent of the mean consine and sine.
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*
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* @param arr array
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* @param weight Weight to compute mean. The deafult is 1/num (uniform).
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* The size must be same with arr.
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* @param wrap The unit of wrapping around.
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* The defeault is 360 as angle.
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* @return angle mean for each channel
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*/
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CVAPI(CvScalar) cvAngleMean( const CvArr *arr,
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const CvArr *weight CV_DEFAULT(NULL),
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double wrap CV_DEFAULT(360) )
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{
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CvMat* mat, matstub;
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CvMat* wmat = NULL, wmatstub;
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CvScalar mean = cvScalar(0,0,0,0);
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int row, col, ch;
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int nChannels;
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CvScalar elem;
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CvScalar mean_cos = cvScalar(0,0,0,0);
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CvScalar mean_sin = cvScalar(0,0,0,0);
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CvScalar welem;
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CV_FUNCNAME( "cvAngleMean" );
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__CV_BEGIN__;
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mat = (CvMat*)arr;
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if( !CV_IS_MAT(mat) )
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{
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CV_CALL( mat = cvGetMat( mat, &matstub ) );
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}
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if( weight != NULL )
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{
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wmat = (CvMat*)weight;
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if( !CV_IS_MAT(wmat) )
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{
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CV_CALL( wmat = cvGetMat( wmat, &wmatstub ) );
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}
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CV_ASSERT(
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mat->rows == wmat->rows &&
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mat->cols == wmat->cols &&
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CV_MAT_CN(mat->type) == CV_MAT_CN(wmat->type)
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);
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}
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nChannels = CV_MAT_CN(mat->type);
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if( wmat == NULL ) // uniform
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{
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double w = 1.0 / (double)mat->rows * (double)mat->cols;
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welem = cvScalar( w, w, w, w );
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}
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for( row = 0; row < mat->rows; row++ )
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{
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for( col = 0; col < mat->cols; col++ )
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{
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elem = cvGet2D( mat, row, col );
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if( wmat != NULL ) welem = cvGet2D( wmat, row, col );
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for( ch = 0; ch < nChannels; ch++ )
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{
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mean_cos.val[ch] +=
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cos( elem.val[ch] * 2*M_PI / wrap ) * welem.val[ch];
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mean_sin.val[ch] +=
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sin( elem.val[ch] * 2*M_PI / wrap ) * welem.val[ch];
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}
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}
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}
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for( ch = 0; ch < nChannels; ch++ )
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{
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mean.val[ch] =
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atan( mean_sin.val[ch] / mean_cos.val[ch] ) * wrap / (2*M_PI);
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}
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__CV_END__;
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return mean;
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}
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#endif
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