"atomic bomb" commit. Reorganized OpenCV directory structure
This commit is contained in:
Vadim Pisarevsky
268
modules/legacy/src/extendededges.cpp
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268
modules/legacy/src/extendededges.cpp
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/*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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#ifdef WIN32 /* make sure it builds under Linux whenever it is included into Makefile.am or not. */
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//void icvCutContour( CvSeq* current, IplImage* image );
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CvSeq* icvCutContourRaster( CvSeq* current, CvMemStorage* storage, IplImage* image );
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//create lists of segments of all contours from image
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CvSeq* cvExtractSingleEdges( IplImage* image, //bw image - it's content will be destroyed by cvFindContours
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CvMemStorage* storage )
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{
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CvMemStorage* tmp_storage = cvCreateChildMemStorage( storage );
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CvSeq* contours = 0;
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cvFindContours( image, tmp_storage, &contours, sizeof(CvContour), CV_RETR_LIST, CV_CHAIN_APPROX_NONE );
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cvZero( image );
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//iterate through contours
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//iterate through tree
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CvSeq* current = contours;
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int number = 0;
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int level = 1;
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CvSeq* output = 0;
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CvSeq* tail_seq = 0;
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//actually this loop can iterates through tree,
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//but still we use CV_RETR_LIST it is not useful
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while( current )
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{
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number++;
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//get vertical list of segments for one contour
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CvSeq* new_seq = icvCutContourRaster( current, storage, image );
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//add this vertical list to horisontal list
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if( new_seq )
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{
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if( tail_seq )
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{
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tail_seq->h_next = new_seq;
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new_seq->h_prev = tail_seq;
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tail_seq = new_seq;
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}
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else
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{
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output = tail_seq = new_seq;
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}
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}
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//iteration through tree
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if( current->v_next )
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{
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//goto child
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current = current->v_next;
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level++;
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}
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else
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{
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//go parent
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while( !current->h_next )
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{
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current = current->v_prev;
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level--;
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if( !level ) break;
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}
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if( current ) //go brother
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current = current->h_next;
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}
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}
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//free temporary memstorage with initial contours
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cvReleaseMemStorage( &tmp_storage );
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return output;
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}
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//makes vertical list of segments for 1 contour
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CvSeq* icvCutContourRaster( CvSeq* current, CvMemStorage* storage, IplImage* image /*tmp image*/)
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{
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//iplSet(image, 0 ); // this can cause double edges if two contours have common edge
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// for example if object is circle with 1 pixel width
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// to remove such problem - remove this iplSet
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//approx contour by single edges
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CvSeqReader reader;
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CvSeqWriter writer;
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int writing = 0;
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cvStartReadSeq( current, &reader, 0 );
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//below line just to avoid warning
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cvStartWriteSeq( current->flags, sizeof(CvContour), sizeof(CvPoint), storage, &writer );
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CvSeq* output = 0;
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CvSeq* tail = 0;
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//first pass through contour - compute number of branches at every point
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int i;
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for( i = 0; i < current->total; i++ )
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{
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CvPoint cur;
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CV_READ_SEQ_ELEM( cur, reader );
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//mark point
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((uchar*)image->imageData)[image->widthStep * cur.y + cur.x]++;
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assert( ((uchar*)image->imageData)[image->widthStep * cur.y + cur.x] != 255 );
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}
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//second pass - create separate edges
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for( i = 0; i < current->total; i++ )
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{
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CvPoint cur;
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CV_READ_SEQ_ELEM( cur, reader );
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//get pixel at this point
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uchar flag = image->imageData[image->widthStep * cur.y + cur.x];
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if( flag != 255 && flag < 3) //
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{
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if(!writing)
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{
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cvStartWriteSeq( current->flags, sizeof(CvContour), sizeof(CvPoint), storage, &writer );
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writing = 1 ;
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}
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//mark point
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if( flag < 3 ) ((uchar*)image->imageData)[image->widthStep * cur.y + cur.x] = 255;
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//add it to another seq
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CV_WRITE_SEQ_ELEM( cur, writer );
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}
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else
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{
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//exclude this point from contour
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if( writing )
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{
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CvSeq* newseq = cvEndWriteSeq( &writer );
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writing = 0;
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if( tail )
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{
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tail->v_next = newseq;
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newseq->v_prev = tail;
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tail = newseq;
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}
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else
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{
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output = tail = newseq;
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}
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}
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}
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}
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if( writing ) //if were not self intersections
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{
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CvSeq* newseq = cvEndWriteSeq( &writer );
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writing = 0;
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if( tail )
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{
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tail->v_next = newseq;
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newseq->v_prev = tail;
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tail = newseq;
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}
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else
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{
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output = tail = newseq;
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}
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}
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return output;
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}
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/*void icvCutContour( CvSeq* current, IplImage* image )
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{
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//approx contour by single edges
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CvSeqReader reader;
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CvSeqReader rev_reader;
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cvStartReadSeq( current, &reader, 0 );
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int64* cur_pt = (int64*)reader.ptr;
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int64* prev_pt = (int64*)reader.prev_elem;
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//search for point a in aba position
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for( int i = 0; i < current->total; i++ )
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{
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CV_NEXT_SEQ_ELEM( sizeof(int64), reader );
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//compare current reader pos element with old previous
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if( prev_pt[0] == ((int64*)reader.ptr)[0] )
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{
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//return to prev pos
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CV_PREV_SEQ_ELEM( sizeof(int64), reader );
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//this point is end of edge
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//start going both directions and collect edge
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cvStartReadSeq( current, &rev_reader, 1 );
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int pos = cvGetSeqReaderPos( &reader );
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cvSetSeqReaderPos( &rev_reader, pos );
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//walk in both directions
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while(1);
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}
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int64* cur_pt = (int64*)reader.ptr;
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int64* prev_pt = (int64*)reader.prev_elem;
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}
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}
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*/
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#endif /* WIN32 */
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