816 lines
24 KiB
C++
816 lines
24 KiB
C++
/*M///////////////////////////////////////////////////////////////////////////////////////
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//
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// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
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//
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// By downloading, copying, installing or using the software you agree to this license.
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// If you do not agree to this license, do not download, install,
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// copy or use the software.
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//
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//
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// Intel License Agreement
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// For Open Source Computer Vision Library
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//
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// Copyright (C) 2000, Intel Corporation, all rights reserved.
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// Third party copyrights are property of their respective owners.
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//
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// Redistribution and use in source and binary forms, with or without modification,
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// are permitted provided that the following conditions are met:
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//
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// * Redistribution's of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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//
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// * Redistribution's in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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//
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// * The name of Intel Corporation may not be used to endorse or promote products
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// derived from this software without specific prior written permission.
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//
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// This software is provided by the copyright holders and contributors "as is" and
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// any express or implied warranties, including, but not limited to, the implied
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// warranties of merchantability and fitness for a particular purpose are disclaimed.
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// In no event shall the Intel Corporation or contributors be liable for any direct,
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// indirect, incidental, special, exemplary, or consequential damages
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// (including, but not limited to, procurement of substitute goods or services;
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// loss of use, data, or profits; or business interruption) however caused
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// and on any theory of liability, whether in contract, strict liability,
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// or tort (including negligence or otherwise) arising in any way out of
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// the use of this software, even if advised of the possibility of such damage.
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//
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//M*/
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#include "precomp.hpp"
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static int
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icvSklansky_32s( CvPoint** array, int start, int end, int* stack, int nsign, int sign2 )
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{
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int incr = end > start ? 1 : -1;
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/* prepare first triangle */
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int pprev = start, pcur = pprev + incr, pnext = pcur + incr;
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int stacksize = 3;
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if( start == end ||
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(array[start]->x == array[end]->x &&
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array[start]->y == array[end]->y) )
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{
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stack[0] = start;
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return 1;
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}
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stack[0] = pprev;
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stack[1] = pcur;
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stack[2] = pnext;
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end += incr; /* make end = afterend */
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while( pnext != end )
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{
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/* check the angle p1,p2,p3 */
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int cury = array[pcur]->y;
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int nexty = array[pnext]->y;
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int by = nexty - cury;
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if( CV_SIGN(by) != nsign )
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{
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int ax = array[pcur]->x - array[pprev]->x;
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int bx = array[pnext]->x - array[pcur]->x;
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int ay = cury - array[pprev]->y;
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int convexity = ay*bx - ax*by;/* if >0 then convex angle */
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if( CV_SIGN(convexity) == sign2 && (ax != 0 || ay != 0) )
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{
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pprev = pcur;
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pcur = pnext;
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pnext += incr;
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stack[stacksize] = pnext;
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stacksize++;
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}
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else
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{
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if( pprev == start )
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{
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pcur = pnext;
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stack[1] = pcur;
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pnext += incr;
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stack[2] = pnext;
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}
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else
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{
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stack[stacksize-2] = pnext;
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pcur = pprev;
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pprev = stack[stacksize-4];
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stacksize--;
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}
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}
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}
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else
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{
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pnext += incr;
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stack[stacksize-1] = pnext;
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}
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}
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return --stacksize;
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}
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static int
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icvSklansky_32f( CvPoint2D32f** array, int start, int end, int* stack, int nsign, int sign2 )
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{
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int incr = end > start ? 1 : -1;
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/* prepare first triangle */
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int pprev = start, pcur = pprev + incr, pnext = pcur + incr;
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int stacksize = 3;
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if( start == end ||
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(array[start]->x == array[end]->x &&
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array[start]->y == array[end]->y) )
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{
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stack[0] = start;
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return 1;
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}
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stack[0] = pprev;
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stack[1] = pcur;
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stack[2] = pnext;
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end += incr; /* make end = afterend */
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while( pnext != end )
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{
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/* check the angle p1,p2,p3 */
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float cury = array[pcur]->y;
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float nexty = array[pnext]->y;
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float by = nexty - cury;
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if( CV_SIGN( by ) != nsign )
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{
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float ax = array[pcur]->x - array[pprev]->x;
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float bx = array[pnext]->x - array[pcur]->x;
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float ay = cury - array[pprev]->y;
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float convexity = ay*bx - ax*by;/* if >0 then convex angle */
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if( CV_SIGN( convexity ) == sign2 && (ax != 0 || ay != 0) )
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{
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pprev = pcur;
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pcur = pnext;
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pnext += incr;
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stack[stacksize] = pnext;
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stacksize++;
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}
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else
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{
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if( pprev == start )
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{
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pcur = pnext;
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stack[1] = pcur;
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pnext += incr;
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stack[2] = pnext;
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}
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else
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{
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stack[stacksize-2] = pnext;
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pcur = pprev;
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pprev = stack[stacksize-4];
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stacksize--;
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}
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}
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}
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else
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{
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pnext += incr;
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stack[stacksize-1] = pnext;
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}
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}
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return --stacksize;
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}
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typedef int (*sklansky_func)( CvPoint** points, int start, int end,
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int* stack, int sign, int sign2 );
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#define cmp_pts( pt1, pt2 ) \
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((pt1)->x < (pt2)->x || ((pt1)->x <= (pt2)->x && (pt1)->y < (pt2)->y))
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static CV_IMPLEMENT_QSORT( icvSortPointsByPointers_32s, CvPoint*, cmp_pts )
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static CV_IMPLEMENT_QSORT( icvSortPointsByPointers_32f, CvPoint2D32f*, cmp_pts )
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static void
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icvCalcAndWritePtIndices( CvPoint** pointer, int* stack, int start, int end,
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CvSeq* ptseq, CvSeqWriter* writer )
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{
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int i, incr = start < end ? 1 : -1;
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int idx, first_idx = ptseq->first->start_index;
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for( i = start; i != end; i += incr )
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{
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CvPoint* ptr = (CvPoint*)pointer[stack[i]];
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CvSeqBlock* block = ptseq->first;
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while( (unsigned)(idx = (int)(ptr - (CvPoint*)block->data)) >= (unsigned)block->count )
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{
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block = block->next;
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if( block == ptseq->first )
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CV_Error( CV_StsError, "Internal error" );
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}
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idx += block->start_index - first_idx;
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CV_WRITE_SEQ_ELEM( idx, *writer );
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}
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}
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CV_IMPL CvSeq*
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cvConvexHull2( const CvArr* array, void* hull_storage,
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int orientation, int return_points )
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{
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union { CvContour* c; CvSeq* s; } hull;
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cv::AutoBuffer<CvPoint*> _pointer;
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CvPoint** pointer;
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CvPoint2D32f** pointerf = 0;
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cv::AutoBuffer<int> _stack;
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int* stack;
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hull.s = 0;
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CvMat* mat = 0;
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CvSeqReader reader;
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CvSeqWriter writer;
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CvContour contour_header;
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union { CvContour c; CvSeq s; } hull_header;
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CvSeqBlock block, hullblock;
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CvSeq* ptseq = 0;
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CvSeq* hullseq = 0;
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int is_float;
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int* t_stack;
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int t_count;
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int i, miny_ind = 0, maxy_ind = 0, total;
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int hulltype;
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int stop_idx;
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sklansky_func sklansky;
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if( CV_IS_SEQ( array ))
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{
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ptseq = (CvSeq*)array;
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if( !CV_IS_SEQ_POINT_SET( ptseq ))
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CV_Error( CV_StsBadArg, "Unsupported sequence type" );
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if( hull_storage == 0 )
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hull_storage = ptseq->storage;
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}
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else
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{
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ptseq = cvPointSeqFromMat( CV_SEQ_KIND_GENERIC, array, &contour_header, &block );
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}
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if( CV_IS_STORAGE( hull_storage ))
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{
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if( return_points )
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{
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hullseq = cvCreateSeq(
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CV_SEQ_KIND_CURVE|CV_SEQ_ELTYPE(ptseq)|
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CV_SEQ_FLAG_CLOSED|CV_SEQ_FLAG_CONVEX,
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sizeof(CvContour), sizeof(CvPoint),(CvMemStorage*)hull_storage );
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}
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else
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{
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hullseq = cvCreateSeq(
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CV_SEQ_KIND_CURVE|CV_SEQ_ELTYPE_PPOINT|
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CV_SEQ_FLAG_CLOSED|CV_SEQ_FLAG_CONVEX,
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sizeof(CvContour), sizeof(CvPoint*), (CvMemStorage*)hull_storage );
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}
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}
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else
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{
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if( !CV_IS_MAT( hull_storage ))
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CV_Error(CV_StsBadArg, "Destination must be valid memory storage or matrix");
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mat = (CvMat*)hull_storage;
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if( (mat->cols != 1 && mat->rows != 1) || !CV_IS_MAT_CONT(mat->type))
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CV_Error( CV_StsBadArg,
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"The hull matrix should be continuous and have a single row or a single column" );
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if( mat->cols + mat->rows - 1 < ptseq->total )
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CV_Error( CV_StsBadSize, "The hull matrix size might be not enough to fit the hull" );
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if( CV_MAT_TYPE(mat->type) != CV_SEQ_ELTYPE(ptseq) &&
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CV_MAT_TYPE(mat->type) != CV_32SC1 )
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CV_Error( CV_StsUnsupportedFormat,
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"The hull matrix must have the same type as input or 32sC1 (integers)" );
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hullseq = cvMakeSeqHeaderForArray(
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CV_SEQ_KIND_CURVE|CV_MAT_TYPE(mat->type)|CV_SEQ_FLAG_CLOSED,
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sizeof(contour_header), CV_ELEM_SIZE(mat->type), mat->data.ptr,
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mat->cols + mat->rows - 1, &hull_header.s, &hullblock );
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cvClearSeq( hullseq );
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}
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total = ptseq->total;
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if( total == 0 )
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{
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if( mat )
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CV_Error( CV_StsBadSize,
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"Point sequence can not be empty if the output is matrix" );
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return hull.s;
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}
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cvStartAppendToSeq( hullseq, &writer );
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is_float = CV_SEQ_ELTYPE(ptseq) == CV_32FC2;
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hulltype = CV_SEQ_ELTYPE(hullseq);
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sklansky = !is_float ? (sklansky_func)icvSklansky_32s :
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(sklansky_func)icvSklansky_32f;
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_pointer.allocate( ptseq->total );
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_stack.allocate( ptseq->total + 2);
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pointer = _pointer;
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pointerf = (CvPoint2D32f**)pointer;
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stack = _stack;
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cvStartReadSeq( ptseq, &reader );
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for( i = 0; i < total; i++ )
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{
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pointer[i] = (CvPoint*)reader.ptr;
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CV_NEXT_SEQ_ELEM( ptseq->elem_size, reader );
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}
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// sort the point set by x-coordinate, find min and max y
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if( !is_float )
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{
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icvSortPointsByPointers_32s( pointer, total, 0 );
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for( i = 1; i < total; i++ )
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{
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int y = pointer[i]->y;
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if( pointer[miny_ind]->y > y )
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miny_ind = i;
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if( pointer[maxy_ind]->y < y )
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maxy_ind = i;
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}
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}
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else
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{
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icvSortPointsByPointers_32f( pointerf, total, 0 );
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for( i = 1; i < total; i++ )
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{
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float y = pointerf[i]->y;
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if( pointerf[miny_ind]->y > y )
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miny_ind = i;
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if( pointerf[maxy_ind]->y < y )
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maxy_ind = i;
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}
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}
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if( pointer[0]->x == pointer[total-1]->x &&
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pointer[0]->y == pointer[total-1]->y )
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{
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if( hulltype == CV_SEQ_ELTYPE_PPOINT )
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{
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CV_WRITE_SEQ_ELEM( pointer[0], writer );
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}
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else if( hulltype == CV_SEQ_ELTYPE_INDEX )
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{
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int index = 0;
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CV_WRITE_SEQ_ELEM( index, writer );
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}
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else
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{
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CvPoint pt = pointer[0][0];
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CV_WRITE_SEQ_ELEM( pt, writer );
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}
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goto finish_hull;
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}
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/*upper half */
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{
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int *tl_stack = stack;
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int tl_count = sklansky( pointer, 0, maxy_ind, tl_stack, -1, 1 );
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int *tr_stack = tl_stack + tl_count;
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int tr_count = sklansky( pointer, ptseq->total - 1, maxy_ind, tr_stack, -1, -1 );
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/* gather upper part of convex hull to output */
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if( orientation == CV_COUNTER_CLOCKWISE )
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{
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CV_SWAP( tl_stack, tr_stack, t_stack );
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CV_SWAP( tl_count, tr_count, t_count );
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}
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if( hulltype == CV_SEQ_ELTYPE_PPOINT )
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{
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for( i = 0; i < tl_count - 1; i++ )
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CV_WRITE_SEQ_ELEM( pointer[tl_stack[i]], writer );
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for( i = tr_count - 1; i > 0; i-- )
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CV_WRITE_SEQ_ELEM( pointer[tr_stack[i]], writer );
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}
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else if( hulltype == CV_SEQ_ELTYPE_INDEX )
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{
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icvCalcAndWritePtIndices( pointer, tl_stack, 0, tl_count-1, ptseq, &writer );
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icvCalcAndWritePtIndices( pointer, tr_stack, tr_count-1, 0, ptseq, &writer );
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}
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else
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{
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for( i = 0; i < tl_count - 1; i++ )
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CV_WRITE_SEQ_ELEM( pointer[tl_stack[i]][0], writer );
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for( i = tr_count - 1; i > 0; i-- )
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CV_WRITE_SEQ_ELEM( pointer[tr_stack[i]][0], writer );
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}
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stop_idx = tr_count > 2 ? tr_stack[1] : tl_count > 2 ? tl_stack[tl_count - 2] : -1;
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}
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/* lower half */
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{
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int *bl_stack = stack;
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int bl_count = sklansky( pointer, 0, miny_ind, bl_stack, 1, -1 );
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int *br_stack = stack + bl_count;
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int br_count = sklansky( pointer, ptseq->total - 1, miny_ind, br_stack, 1, 1 );
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if( orientation != CV_COUNTER_CLOCKWISE )
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{
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CV_SWAP( bl_stack, br_stack, t_stack );
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CV_SWAP( bl_count, br_count, t_count );
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}
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if( stop_idx >= 0 )
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{
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int check_idx = bl_count > 2 ? bl_stack[1] :
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bl_count + br_count > 2 ? br_stack[2-bl_count] : -1;
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if( check_idx == stop_idx || (check_idx >= 0 &&
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pointer[check_idx]->x == pointer[stop_idx]->x &&
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pointer[check_idx]->y == pointer[stop_idx]->y) )
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{
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/* if all the points lie on the same line, then
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the bottom part of the convex hull is the mirrored top part
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(except the exteme points).*/
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bl_count = MIN( bl_count, 2 );
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br_count = MIN( br_count, 2 );
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}
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}
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if( hulltype == CV_SEQ_ELTYPE_PPOINT )
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{
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for( i = 0; i < bl_count - 1; i++ )
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CV_WRITE_SEQ_ELEM( pointer[bl_stack[i]], writer );
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for( i = br_count - 1; i > 0; i-- )
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CV_WRITE_SEQ_ELEM( pointer[br_stack[i]], writer );
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}
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else if( hulltype == CV_SEQ_ELTYPE_INDEX )
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{
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icvCalcAndWritePtIndices( pointer, bl_stack, 0, bl_count-1, ptseq, &writer );
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icvCalcAndWritePtIndices( pointer, br_stack, br_count-1, 0, ptseq, &writer );
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}
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else
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{
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for( i = 0; i < bl_count - 1; i++ )
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CV_WRITE_SEQ_ELEM( pointer[bl_stack[i]][0], writer );
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for( i = br_count - 1; i > 0; i-- )
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CV_WRITE_SEQ_ELEM( pointer[br_stack[i]][0], writer );
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}
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}
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finish_hull:
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cvEndWriteSeq( &writer );
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if( mat )
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{
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if( mat->rows > mat->cols )
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mat->rows = hullseq->total;
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else
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mat->cols = hullseq->total;
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}
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else
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{
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hull.s = hullseq;
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hull.c->rect = cvBoundingRect( ptseq,
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ptseq->header_size < (int)sizeof(CvContour) ||
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&ptseq->flags == &contour_header.flags );
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/*if( ptseq != (CvSeq*)&contour_header )
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hullseq->v_prev = ptseq;*/
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}
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return hull.s;
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}
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/* contour must be a simple polygon */
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/* it must have more than 3 points */
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CV_IMPL CvSeq* cvConvexityDefects( const CvArr* array,
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const CvArr* hullarray,
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CvMemStorage* storage )
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|
{
|
|
CvSeq* defects = 0;
|
|
|
|
int i, index;
|
|
CvPoint* hull_cur;
|
|
|
|
/* is orientation of hull different from contour one */
|
|
int rev_orientation;
|
|
|
|
CvContour contour_header;
|
|
union { CvContour c; CvSeq s; } hull_header;
|
|
CvSeqBlock block, hullblock;
|
|
CvSeq *ptseq = (CvSeq*)array, *hull = (CvSeq*)hullarray;
|
|
|
|
CvSeqReader hull_reader;
|
|
CvSeqReader ptseq_reader;
|
|
CvSeqWriter writer;
|
|
int is_index;
|
|
|
|
if( CV_IS_SEQ( ptseq ))
|
|
{
|
|
if( !CV_IS_SEQ_POINT_SET( ptseq ))
|
|
CV_Error( CV_StsUnsupportedFormat,
|
|
"Input sequence is not a sequence of points" );
|
|
if( !storage )
|
|
storage = ptseq->storage;
|
|
}
|
|
else
|
|
{
|
|
ptseq = cvPointSeqFromMat( CV_SEQ_KIND_GENERIC, array, &contour_header, &block );
|
|
}
|
|
|
|
if( CV_SEQ_ELTYPE( ptseq ) != CV_32SC2 )
|
|
CV_Error( CV_StsUnsupportedFormat, "Floating-point coordinates are not supported here" );
|
|
|
|
if( CV_IS_SEQ( hull ))
|
|
{
|
|
int hulltype = CV_SEQ_ELTYPE( hull );
|
|
if( hulltype != CV_SEQ_ELTYPE_PPOINT && hulltype != CV_SEQ_ELTYPE_INDEX )
|
|
CV_Error( CV_StsUnsupportedFormat,
|
|
"Convex hull must represented as a sequence "
|
|
"of indices or sequence of pointers" );
|
|
if( !storage )
|
|
storage = hull->storage;
|
|
}
|
|
else
|
|
{
|
|
CvMat* mat = (CvMat*)hull;
|
|
|
|
if( !CV_IS_MAT( hull ))
|
|
CV_Error(CV_StsBadArg, "Convex hull is neither sequence nor matrix");
|
|
|
|
if( (mat->cols != 1 && mat->rows != 1) ||
|
|
!CV_IS_MAT_CONT(mat->type) || CV_MAT_TYPE(mat->type) != CV_32SC1 )
|
|
CV_Error( CV_StsBadArg,
|
|
"The matrix should be 1-dimensional and continuous array of int's" );
|
|
|
|
if( mat->cols + mat->rows - 1 > ptseq->total )
|
|
CV_Error( CV_StsBadSize, "Convex hull is larger than the point sequence" );
|
|
|
|
hull = cvMakeSeqHeaderForArray(
|
|
CV_SEQ_KIND_CURVE|CV_MAT_TYPE(mat->type)|CV_SEQ_FLAG_CLOSED,
|
|
sizeof(CvContour), CV_ELEM_SIZE(mat->type), mat->data.ptr,
|
|
mat->cols + mat->rows - 1, &hull_header.s, &hullblock );
|
|
}
|
|
|
|
is_index = CV_SEQ_ELTYPE(hull) == CV_SEQ_ELTYPE_INDEX;
|
|
|
|
if( !storage )
|
|
CV_Error( CV_StsNullPtr, "NULL storage pointer" );
|
|
|
|
defects = cvCreateSeq( CV_SEQ_KIND_GENERIC, sizeof(CvSeq), sizeof(CvConvexityDefect), storage );
|
|
|
|
if( ptseq->total < 4 || hull->total < 3)
|
|
{
|
|
//CV_ERROR( CV_StsBadSize,
|
|
// "point seq size must be >= 4, convex hull size must be >= 3" );
|
|
return defects;
|
|
}
|
|
|
|
/* recognize co-orientation of ptseq and its hull */
|
|
{
|
|
int sign = 0;
|
|
int index1, index2, index3;
|
|
|
|
if( !is_index )
|
|
{
|
|
CvPoint* pos = *CV_SEQ_ELEM( hull, CvPoint*, 0 );
|
|
index1 = cvSeqElemIdx( ptseq, pos );
|
|
|
|
pos = *CV_SEQ_ELEM( hull, CvPoint*, 1 );
|
|
index2 = cvSeqElemIdx( ptseq, pos );
|
|
|
|
pos = *CV_SEQ_ELEM( hull, CvPoint*, 2 );
|
|
index3 = cvSeqElemIdx( ptseq, pos );
|
|
}
|
|
else
|
|
{
|
|
index1 = *CV_SEQ_ELEM( hull, int, 0 );
|
|
index2 = *CV_SEQ_ELEM( hull, int, 1 );
|
|
index3 = *CV_SEQ_ELEM( hull, int, 2 );
|
|
}
|
|
|
|
sign += (index2 > index1) ? 1 : 0;
|
|
sign += (index3 > index2) ? 1 : 0;
|
|
sign += (index1 > index3) ? 1 : 0;
|
|
|
|
rev_orientation = (sign == 2) ? 0 : 1;
|
|
}
|
|
|
|
cvStartReadSeq( ptseq, &ptseq_reader, 0 );
|
|
cvStartReadSeq( hull, &hull_reader, rev_orientation );
|
|
|
|
if( !is_index )
|
|
{
|
|
hull_cur = *(CvPoint**)hull_reader.prev_elem;
|
|
index = cvSeqElemIdx( ptseq, (char*)hull_cur, 0 );
|
|
}
|
|
else
|
|
{
|
|
index = *(int*)hull_reader.prev_elem;
|
|
hull_cur = CV_GET_SEQ_ELEM( CvPoint, ptseq, index );
|
|
}
|
|
cvSetSeqReaderPos( &ptseq_reader, index );
|
|
cvStartAppendToSeq( defects, &writer );
|
|
|
|
/* cycle through ptseq and hull with computing defects */
|
|
for( i = 0; i < hull->total; i++ )
|
|
{
|
|
CvConvexityDefect defect;
|
|
int is_defect = 0;
|
|
double dx0, dy0;
|
|
double depth = 0, scale;
|
|
CvPoint* hull_next;
|
|
|
|
if( !is_index )
|
|
hull_next = *(CvPoint**)hull_reader.ptr;
|
|
else
|
|
{
|
|
int t = *(int*)hull_reader.ptr;
|
|
hull_next = CV_GET_SEQ_ELEM( CvPoint, ptseq, t );
|
|
}
|
|
|
|
dx0 = (double)hull_next->x - (double)hull_cur->x;
|
|
dy0 = (double)hull_next->y - (double)hull_cur->y;
|
|
assert( dx0 != 0 || dy0 != 0 );
|
|
scale = 1./sqrt(dx0*dx0 + dy0*dy0);
|
|
|
|
defect.start = hull_cur;
|
|
defect.end = hull_next;
|
|
|
|
for(;;)
|
|
{
|
|
/* go through ptseq to achieve next hull point */
|
|
CV_NEXT_SEQ_ELEM( sizeof(CvPoint), ptseq_reader );
|
|
|
|
if( ptseq_reader.ptr == (schar*)hull_next )
|
|
break;
|
|
else
|
|
{
|
|
CvPoint* cur = (CvPoint*)ptseq_reader.ptr;
|
|
|
|
/* compute distance from current point to hull edge */
|
|
double dx = (double)cur->x - (double)hull_cur->x;
|
|
double dy = (double)cur->y - (double)hull_cur->y;
|
|
|
|
/* compute depth */
|
|
double dist = fabs(-dy0*dx + dx0*dy) * scale;
|
|
|
|
if( dist > depth )
|
|
{
|
|
depth = dist;
|
|
defect.depth_point = cur;
|
|
defect.depth = (float)depth;
|
|
is_defect = 1;
|
|
}
|
|
}
|
|
}
|
|
if( is_defect )
|
|
{
|
|
CV_WRITE_SEQ_ELEM( defect, writer );
|
|
}
|
|
|
|
hull_cur = hull_next;
|
|
if( rev_orientation )
|
|
{
|
|
CV_PREV_SEQ_ELEM( hull->elem_size, hull_reader );
|
|
}
|
|
else
|
|
{
|
|
CV_NEXT_SEQ_ELEM( hull->elem_size, hull_reader );
|
|
}
|
|
}
|
|
|
|
return cvEndWriteSeq( &writer );
|
|
}
|
|
|
|
|
|
CV_IMPL int
|
|
cvCheckContourConvexity( const CvArr* array )
|
|
{
|
|
int flag = -1;
|
|
|
|
int i;
|
|
int orientation = 0;
|
|
CvSeqReader reader;
|
|
CvContour contour_header;
|
|
CvSeqBlock block;
|
|
CvSeq* contour = (CvSeq*)array;
|
|
|
|
if( CV_IS_SEQ(contour) )
|
|
{
|
|
if( !CV_IS_SEQ_POINT_SET(contour))
|
|
CV_Error( CV_StsUnsupportedFormat,
|
|
"Input sequence must be polygon (closed 2d curve)" );
|
|
}
|
|
else
|
|
{
|
|
contour = cvPointSeqFromMat(CV_SEQ_KIND_CURVE|CV_SEQ_FLAG_CLOSED, array, &contour_header, &block );
|
|
}
|
|
|
|
if( contour->total == 0 )
|
|
return -1;
|
|
|
|
cvStartReadSeq( contour, &reader, 0 );
|
|
flag = 1;
|
|
|
|
if( CV_SEQ_ELTYPE( contour ) == CV_32SC2 )
|
|
{
|
|
CvPoint *prev_pt = (CvPoint*)reader.prev_elem;
|
|
CvPoint *cur_pt = (CvPoint*)reader.ptr;
|
|
|
|
int dx0 = cur_pt->x - prev_pt->x;
|
|
int dy0 = cur_pt->y - prev_pt->y;
|
|
|
|
for( i = 0; i < contour->total; i++ )
|
|
{
|
|
int dxdy0, dydx0;
|
|
int dx, dy;
|
|
|
|
/*int orient; */
|
|
CV_NEXT_SEQ_ELEM( sizeof(CvPoint), reader );
|
|
prev_pt = cur_pt;
|
|
cur_pt = (CvPoint *) reader.ptr;
|
|
|
|
dx = cur_pt->x - prev_pt->x;
|
|
dy = cur_pt->y - prev_pt->y;
|
|
dxdy0 = dx * dy0;
|
|
dydx0 = dy * dx0;
|
|
|
|
/* find orientation */
|
|
/*orient = -dy0 * dx + dx0 * dy;
|
|
orientation |= (orient > 0) ? 1 : 2;
|
|
*/
|
|
orientation |= (dydx0 > dxdy0) ? 1 : ((dydx0 < dxdy0) ? 2 : 3);
|
|
|
|
if( orientation == 3 )
|
|
{
|
|
flag = 0;
|
|
break;
|
|
}
|
|
|
|
dx0 = dx;
|
|
dy0 = dy;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
CV_Assert( CV_SEQ_ELTYPE(contour) == CV_32FC2 );
|
|
|
|
CvPoint2D32f *prev_pt = (CvPoint2D32f*)reader.prev_elem;
|
|
CvPoint2D32f *cur_pt = (CvPoint2D32f*)reader.ptr;
|
|
|
|
float dx0 = cur_pt->x - prev_pt->x;
|
|
float dy0 = cur_pt->y - prev_pt->y;
|
|
|
|
for( i = 0; i < contour->total; i++ )
|
|
{
|
|
float dxdy0, dydx0;
|
|
float dx, dy;
|
|
|
|
/*int orient; */
|
|
CV_NEXT_SEQ_ELEM( sizeof(CvPoint2D32f), reader );
|
|
prev_pt = cur_pt;
|
|
cur_pt = (CvPoint2D32f*) reader.ptr;
|
|
|
|
dx = cur_pt->x - prev_pt->x;
|
|
dy = cur_pt->y - prev_pt->y;
|
|
dxdy0 = dx * dy0;
|
|
dydx0 = dy * dx0;
|
|
|
|
/* find orientation */
|
|
/*orient = -dy0 * dx + dx0 * dy;
|
|
orientation |= (orient > 0) ? 1 : 2;
|
|
*/
|
|
orientation |= (dydx0 > dxdy0) ? 1 : ((dydx0 < dxdy0) ? 2 : 3);
|
|
|
|
if( orientation == 3 )
|
|
{
|
|
flag = 0;
|
|
break;
|
|
}
|
|
|
|
dx0 = dx;
|
|
dy0 = dy;
|
|
}
|
|
}
|
|
|
|
return flag;
|
|
}
|
|
|
|
|
|
/* End of file. */
|