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opencv/modules/legacy/src/segment.cpp

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/*M///////////////////////////////////////////////////////////////////////////////////////
//
// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
//
// By downloading, copying, installing or using the software you agree to this license.
// If you do not agree to this license, do not download, install,
// copy or use the software.
//
//
// Intel License Agreement
// For Open Source Computer Vision Library
//
// Copyright (C) 2000, Intel Corporation, all rights reserved.
// Third party copyrights are property of their respective owners.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
// * Redistribution's of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// * Redistribution's in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// * The name of Intel Corporation may not be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// This software is provided by the copyright holders and contributors "as is" and
// any express or implied warranties, including, but not limited to, the implied
// warranties of merchantability and fitness for a particular purpose are disclaimed.
// In no event shall the Intel Corporation or contributors be liable for any direct,
// indirect, incidental, special, exemplary, or consequential damages
// (including, but not limited to, procurement of substitute goods or services;
// loss of use, data, or profits; or business interruption) however caused
// and on any theory of liability, whether in contract, strict liability,
// or tort (including negligence or otherwise) arising in any way out of
// the use of this software, even if advised of the possibility of such damage.
//
//M*/
#include "precomp.hpp"
typedef struct Seg
{
ushort y;
ushort l;
ushort r;
ushort Prevl;
ushort Prevr;
short fl;
}
Seg;
#define UP 1
#define DOWN -1
#define PUSH(Y,IL,IR,IPL,IPR,FL) { stack[StIn].y=(ushort)(Y); \
stack[StIn].l=(ushort)(IL); \
stack[StIn].r=(ushort)(IR); \
stack[StIn].Prevl=(ushort)(IPL); \
stack[StIn].Prevr=(ushort)(IPR); \
stack[StIn].fl=(short)(FL); \
StIn++; }
#define POP(Y,IL,IR,IPL,IPR,FL) { StIn--; \
Y=stack[StIn].y; \
IL=stack[StIn].l; \
IR=stack[StIn].r;\
IPL=stack[StIn].Prevl; \
IPR=stack[StIn].Prevr; \
FL=stack[StIn].fl; }
#define DIFF(p1,p2) ((unsigned)((p1)[0] - (p2)[0] + d_lw)<=Interval && \
(unsigned)((p1)[1] - (p2)[1] + d_lw)<=Interval && \
(unsigned)((p1)[2] - (p2)[2] + d_lw)<=Interval)
/*#define DIFF(p1,p2) (CV_IABS((p1)[0] - (p2)[0]) + \
CV_IABS((p1)[1] - (p2)[1]) + \
CV_IABS((p1)[2] - (p2)[2]) <=Interval )*/
static CvStatus
icvSegmFloodFill_Stage1( uchar* pImage, int step,
uchar* pMask, int maskStep,
CvSize /*roi*/, CvPoint seed,
int* newVal, int d_lw, int d_up,
CvConnectedComp * region,
void *pStack )
{
uchar* img = pImage + step * seed.y;
uchar* mask = pMask + maskStep * (seed.y + 1);
unsigned Interval = (unsigned) (d_up + d_lw);
Seg *stack = (Seg*)pStack;
int StIn = 0;
int i, L, R;
int area = 0;
int sum[] = { 0, 0, 0 };
int XMin, XMax, YMin = seed.y, YMax = seed.y;
int val0[3];
L = R = seed.x;
img = pImage + seed.y*step;
mask = pMask + seed.y*maskStep;
mask[L] = 1;
val0[0] = img[seed.x*3];
val0[1] = img[seed.x*3 + 1];
val0[2] = img[seed.x*3 + 2];
while( DIFF( img + (R+1)*3, /*img + R*3*/val0 ) && !mask[R + 1] )
mask[++R] = 2;
while( DIFF( img + (L-1)*3, /*img + L*3*/val0 ) && !mask[L - 1] )
mask[--L] = 2;
XMax = R;
XMin = L;
PUSH( seed.y, L, R, R + 1, R, UP );
while( StIn )
{
int k, YC, PL, PR, flag/*, curstep*/;
POP( YC, L, R, PL, PR, flag );
int data[][3] = { {-flag, L, R}, {flag, L, PL-1}, {flag,PR+1,R}};
if( XMax < R )
XMax = R;
if( XMin > L )
XMin = L;
if( YMax < YC )
YMax = YC;
if( YMin > YC )
YMin = YC;
for( k = 0; k < 3; k++ )
{
flag = data[k][0];
/*curstep = flag * step;*/
img = pImage + (YC + flag) * step;
mask = pMask + (YC + flag) * maskStep;
int left = data[k][1];
int right = data[k][2];
for( i = left; i <= right; i++ )
{
if( !mask[i] && DIFF( img + i*3, /*img - curstep + i*3*/val0 ))
{
int j = i;
mask[i] = 2;
while( !mask[j - 1] && DIFF( img + (j - 1)*3, /*img + j*3*/val0 ))
mask[--j] = 2;
while( !mask[i + 1] &&
(DIFF( img + (i+1)*3, /*img + i*3*/val0 ) ||
(DIFF( img + (i+1)*3, /*img + (i+1)*3 - curstep*/val0) && i < R)))
mask[++i] = 2;
PUSH( YC + flag, j, i, L, R, -flag );
i++;
}
}
}
img = pImage + YC * step;
for( i = L; i <= R; i++ )
{
sum[0] += img[i*3];
sum[1] += img[i*3 + 1];
sum[2] += img[i*3 + 2];
}
area += R - L + 1;
}
region->area = area;
region->rect.x = XMin;
region->rect.y = YMin;
region->rect.width = XMax - XMin + 1;
region->rect.height = YMax - YMin + 1;
region->value = cvScalarAll(0);
{
double inv_area = area ? 1./area : 0;
newVal[0] = cvRound( sum[0] * inv_area );
newVal[1] = cvRound( sum[1] * inv_area );
newVal[2] = cvRound( sum[2] * inv_area );
}
return CV_NO_ERR;
}
#undef PUSH
#undef POP
#undef DIFF
static CvStatus
icvSegmFloodFill_Stage2( uchar* pImage, int step,
uchar* pMask, int maskStep,
CvSize /*roi*/, int* newVal,
CvRect rect )
{
uchar* img = pImage + step * rect.y + rect.x * 3;
uchar* mask = pMask + maskStep * rect.y + rect.x;
uchar uv[] = { (uchar)newVal[0], (uchar)newVal[1], (uchar)newVal[2] };
int x, y;
for( y = 0; y < rect.height; y++, img += step, mask += maskStep )
for( x = 0; x < rect.width; x++ )
if( mask[x] == 2 )
{
mask[x] = 1;
img[x*3] = uv[0];
img[x*3+1] = uv[1];
img[x*3+2] = uv[2];
}
return CV_OK;
}
#if 0
static void color_derv( const CvArr* srcArr, CvArr* dstArr, int thresh )
{
static int tab[] = { 0, 2, 2, 1 };
uchar *src = 0, *dst = 0;
int dst_step, src_step;
int x, y;
CvSize size;
cvGetRawData( srcArr, (uchar**)&src, &src_step, &size );
cvGetRawData( dstArr, (uchar**)&dst, &dst_step, 0 );
memset( dst, 0, size.width*sizeof(dst[0]));
memset( (uchar*)dst + dst_step*(size.height-1), 0, size.width*sizeof(dst[0]));
src += 3;
#define CV_IABS(a) (((a) ^ ((a) < 0 ? -1 : 0)) - ((a) < 0 ? -1 : 0))
for( y = 1; y < size.height - 1; y++ )
{
src += src_step;
dst += dst_step;
uchar* src0 = src;
dst[0] = dst[size.width - 1] = 0;
for( x = 1; x < size.width - 1; x++, src += 3 )
{
/*int d[3];
int ad[3];
int f0, f1;
int val;*/
int m[3];
double val;
//double xx, yy;
int dh[3];
int dv[3];
dh[0] = src[0] - src[-3];
dv[0] = src[0] - src[-src_step];
dh[1] = src[1] - src[-2];
dv[1] = src[1] - src[1-src_step];
dh[2] = src[2] - src[-1];
dv[2] = src[2] - src[2-src_step];
m[0] = dh[0]*dh[0] + dh[1]*dh[1] + dh[2]*dh[2];
m[2] = dh[0]*dv[0] + dh[1]*dv[1] + dh[2]*dv[2];
m[1] = dv[0]*dv[0] + dv[1]*dv[1] + dh[2]*dh[2];
val = (m[0] + m[2]) +
sqrt(((double)((double)m[0] - m[2]))*(m[0] - m[2]) + (4.*m[1])*m[1]);
/*
xx = m[1];
yy = v - m[0];
v /= sqrt(xx*xx + yy*yy) + 1e-7;
xx *= v;
yy *= v;
dx[x] = (short)cvRound(xx);
dy[x] = (short)cvRound(yy);
//dx[x] = (short)cvRound(v);
//dx[x] = dy[x] = (short)v;
d[0] = src[0] - src[-3];
ad[0] = CV_IABS(d[0]);
d[1] = src[1] - src[-2];
ad[1] = CV_IABS(d[1]);
d[2] = src[2] - src[-1];
ad[2] = CV_IABS(d[2]);
f0 = ad[1] > ad[0];
f1 = ad[2] > ad[f0];
val = d[tab[f0*2 + f1]];
d[0] = src[0] - src[-src_step];
ad[0] = CV_IABS(d[0]);
d[1] = src[1] - src[1-src_step];
ad[1] = CV_IABS(d[1]);
d[2] = src[2] - src[2-src_step];
ad[2] = CV_IABS(d[2]);
f0 = ad[1] > ad[0];
f1 = ad[2] > ad[f0];
dst[x] = (uchar)(val + d[tab[f0*2 + f1]] > thresh ? 255 : 0);*/
dst[x] = (uchar)(val > thresh);
}
src = src0;
}
}
#endif
const CvPoint icvCodeDeltas[8] =
{ {1, 0}, {1, -1}, {0, -1}, {-1, -1}, {-1, 0}, {-1, 1}, {0, 1}, {1, 1} };
static CvSeq*
icvGetComponent( uchar* img, int step, CvRect rect,
CvMemStorage* storage )
{
const char nbd = 4;
int deltas[16];
int x, y;
CvSeq* exterior = 0;
char* ptr;
/* initialize local state */
CV_INIT_3X3_DELTAS( deltas, step, 1 );
memcpy( deltas + 8, deltas, 8 * sizeof( deltas[0] ));
ptr = (char*)(img + step*rect.y);
rect.width += rect.x;
rect.height += rect.y;
for( y = rect.y; y < rect.height; y++, ptr += step )
{
int prev = ptr[rect.x - 1] & -2;
for( x = rect.x; x < rect.width; x++ )
{
int p = ptr[x] & -2;
//assert( exterior || ((p | prev) & -4) == 0 );
if( p != prev )
{
CvSeq *seq = 0;
int is_hole = 0;
CvSeqWriter writer;
char *i0, *i1, *i3, *i4 = 0;
int prev_s = -1, s, s_end;
CvPoint pt = { x, y };
if( !(prev == 0 && p == 2) ) /* if not external contour */
{
/* check hole */
if( p != 0 || prev < 1 )
{
prev = p;
continue;
}
is_hole = 1;
if( !exterior )
{
assert(0);
return 0;
}
}
cvStartWriteSeq( CV_SEQ_CONTOUR | (is_hole ? CV_SEQ_FLAG_HOLE : 0),
sizeof(CvContour), sizeof(CvPoint), storage, &writer );
s_end = s = is_hole ? 0 : 4;
i0 = ptr + x - is_hole;
do
{
s = (s - 1) & 7;
i1 = i0 + deltas[s];
if( (*i1 & -2) != 0 )
break;
}
while( s != s_end );
if( s == s_end ) /* single pixel domain */
{
*i0 = (char) (nbd | -128);
CV_WRITE_SEQ_ELEM( pt, writer );
}
else
{
i3 = i0;
prev_s = s ^ 4;
/* follow border */
for( ;; )
{
s_end = s;
for( ;; )
{
i4 = i3 + deltas[++s];
if( (*i4 & -2) != 0 )
break;
}
s &= 7;
/* check "right" bound */
if( (unsigned) (s - 1) < (unsigned) s_end )
{
*i3 = (char) (nbd | -128);
}
else if( *i3 > 0 )
{
*i3 = nbd;
}
if( s != prev_s )
{
CV_WRITE_SEQ_ELEM( pt, writer );
prev_s = s;
}
pt.x += icvCodeDeltas[s].x;
pt.y += icvCodeDeltas[s].y;
if( i4 == i0 && i3 == i1 )
break;
i3 = i4;
s = (s + 4) & 7;
} /* end of border following loop */
}
seq = cvEndWriteSeq( &writer );
cvContourBoundingRect( seq, 1 );
if( !is_hole )
exterior = seq;
else
{
seq->v_prev = exterior;
seq->h_next = exterior->v_next;
if( seq->h_next )
seq->h_next->h_prev = seq;
exterior->v_next = seq;
}
prev = ptr[x] & -2;
}
}
}
return exterior;
}
CV_IMPL CvSeq*
cvSegmentImage( const CvArr* srcarr, CvArr* dstarr,
double canny_threshold,
double ffill_threshold,
CvMemStorage* storage )
{
CvSeq* root = 0;
CvMat* gray = 0;
CvMat* canny = 0;
//CvMat* temp = 0;
void* stack = 0;
CV_FUNCNAME( "cvSegmentImage" );
__BEGIN__;
CvMat srcstub, *src;
CvMat dststub, *dst;
CvMat* mask;
CvSize size;
CvPoint pt;
int ffill_lw_up = cvRound( fabs(ffill_threshold) );
CvSeq* prev_seq = 0;
CV_CALL( src = cvGetMat( srcarr, &srcstub ));
CV_CALL( dst = cvGetMat( dstarr, &dststub ));
size = cvGetSize( src );
CV_CALL( gray = cvCreateMat( size.height, size.width, CV_8UC1 ));
CV_CALL( canny = cvCreateMat( size.height, size.width, CV_8UC1 ));
//CV_CALL( temp = cvCreateMat( size.height/2, size.width/2, CV_8UC3 ));
CV_CALL( stack = cvAlloc( size.width * size.height * sizeof(Seg)));
cvCvtColor( src, gray, CV_BGR2GRAY );
cvCanny( gray, canny, 0/*canny_threshold*0.4*/, canny_threshold, 3 );
cvThreshold( canny, canny, 1, 1, CV_THRESH_BINARY );
//cvZero( canny );
//color_derv( src, canny, canny_threshold );
//cvPyrDown( src, temp );
//cvPyrUp( temp, dst );
//src = dst;
mask = canny; // a new name for new role
// make a non-zero border.
cvRectangle( mask, cvPoint(0,0), cvPoint(size.width-1,size.height-1), cvScalarAll(1), 1 );
for( pt.y = 0; pt.y < size.height; pt.y++ )
{
for( pt.x = 0; pt.x < size.width; pt.x++ )
{
if( mask->data.ptr[mask->step*pt.y + pt.x] == 0 )
{
CvConnectedComp region;
int avgVal[3] = { 0, 0, 0 };
icvSegmFloodFill_Stage1( src->data.ptr, src->step,
mask->data.ptr, mask->step,
size, pt, avgVal,
ffill_lw_up, ffill_lw_up,
&region, stack );
/*avgVal[0] = (avgVal[0] + 15) & -32;
if( avgVal[0] > 255 )
avgVal[0] = 255;
avgVal[1] = (avgVal[1] + 15) & -32;
if( avgVal[1] > 255 )
avgVal[1] = 255;
avgVal[2] = (avgVal[2] + 15) & -32;
if( avgVal[2] > 255 )
avgVal[2] = 255;*/
if( storage )
{
CvSeq* tmpseq = icvGetComponent( mask->data.ptr, mask->step,
region.rect, storage );
if( tmpseq != 0 )
{
((CvContour*)tmpseq)->color = avgVal[0] + (avgVal[1] << 8) + (avgVal[2] << 16);
tmpseq->h_prev = prev_seq;
if( prev_seq )
prev_seq->h_next = tmpseq;
else
root = tmpseq;
prev_seq = tmpseq;
}
}
icvSegmFloodFill_Stage2( dst->data.ptr, dst->step,
mask->data.ptr, mask->step,
size, avgVal,
region.rect );
}
}
}
__END__;
//cvReleaseMat( &temp );
cvReleaseMat( &gray );
cvReleaseMat( &canny );
cvFree( &stack );
return root;
}
/* End of file. */
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