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100 lines
3.4 KiB
100 lines
3.4 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_CREATEAFFINE_INCLUDED
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#define CV_CREATEAFFINE_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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#define _USE_MATH_DEFINES
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#include <math.h>
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#include "cvrect32f.h"
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/**
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* Create an affine transform matrix from parameters.
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*
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* @param affine The 2 x 3 CV_32FC1|CV_64FC1 affine matrix to be created
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* @param rect The translation (x, y) and scaling (width, height) and
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* rotation (angle) paramenter in degree
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* @param shear The shear deformation parameter shx and shy
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* @return CVAPI(void)
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*
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* References)
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* @verbatim
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@Book{Hartley2004,
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author = "Hartley, R.~I. and Zisserman, A.",
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title = "Multiple View Geometry in Computer Vision",
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edition = "Second",
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year = "2004",
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publisher = "Cambridge University Press, ISBN: 0521540518"
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} @endverbatim
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*/
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CVAPI(void) cvCreateAffine( CvMat* affine,
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CvRect32f rect CV_DEFAULT(cvRect32f(0,0,1,1,0)),
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CvPoint2D32f shear CV_DEFAULT(cvPoint2D32f(0,0)) )
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{
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double c, s;
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CvMat *R, *S, *A, hdr;
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CV_FUNCNAME( "cvCreateAffine" );
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__CV_BEGIN__;
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CV_ASSERT( rect.width > 0 && rect.height > 0 );
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CV_ASSERT( affine->rows == 2 && affine->cols == 3 );
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// affine = [ A T ]
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// A = [ a b; c d ]
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// Translation T = [ tx; ty ]
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// (1) A = Rotation * Shear(-phi) * [sx 0; 0 sy] * Shear(phi)
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// (2) A = Rotation * [sx shx; shy sy]
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// Use (2)
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// T = [tx; ty]
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cvmSet( affine, 0, 2, rect.x ); cvmSet( affine, 1, 2, rect.y );
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// R = [cos -sin; sin cos]
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R = cvCreateMat( 2, 2, affine->type );
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/*CvMat* R = cvCreateMat( 2, 3, CV_32FC1 );
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cv2DRotationMatrix( cvPoint2D32f( 0, 0 ), rect.angle, 1.0, R ); */
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c = cos( -M_PI / 180 * rect.angle );
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s = sin( -M_PI / 180 * rect.angle );
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cvmSet( R, 0, 0, c ); cvmSet( R, 0, 1, -s );
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cvmSet( R, 1, 0, s ); cvmSet( R, 1, 1, c );
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// S = [sx shx; shy sy]
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S = cvCreateMat( 2, 2, affine->type );
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cvmSet( S, 0, 0, rect.width ); cvmSet( S, 0, 1, shear.x );
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cvmSet( S, 1, 0, shear.y ); cvmSet( S, 1, 1, rect.height );
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// A = R * S
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A = cvGetCols( affine, &hdr, 0, 2 );
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cvMatMul ( R, S, A );
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cvReleaseMat( &R );
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cvReleaseMat( &S );
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__CV_END__;
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}
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#endif
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