int main(int argc, char** argv)
{
IplImage* temp1 = NULL;
IplImage* temp2 = NULL;
IplImage* result = NULL;
IplImage* result1 = NULL;
IplImage* result2 = NULL;
CvBGStatModel* bg_model=0;
CvBGStatModel* bg_model1=0;
IplImage* rawImage = 0;
IplImage* yuvImage = 0;
IplImage* rawImage1 = 0;
IplImage* pFrImg = 0;
IplImage* pFrImg1= 0;
IplImage* pFrImg2= 0;
IplImage* ImaskCodeBookCC = 0;
CvCapture* capture = 0;
int c,n;
maxMod[0] = 25;
minMod[0] = 35;
maxMod[1] = 8;
minMod[1] = 8;
maxMod[2] = 8;
minMod[2] = 8;
argc=2;
argv[1]="intelligentroom_raw.avi";
if( argc > 2 )
{
fprintf(stderr, "Usage: bkgrd [video_file_name]\n");
return -1;
}
if (argc ==1)
if( !(capture = cvCaptureFromCAM(-1)))
{
fprintf(stderr, "Can not open camera.\n");
return -2;
}
if(argc == 2)
if( !(capture = cvCaptureFromFile(argv[1])))
{
fprintf(stderr, "Can not open video file %s\n", argv[1]);
return -2;
}
bool pause = false;
bool singlestep = false;
if( capture )
{
cvNamedWindow( "原视频序列图像", 1 );
cvNamedWindow("不实时更新的Codebook算法[本文]",1);
cvNamedWindow("实时更新的Codebook算法[本文]",1);
cvNamedWindow("基于MOG的方法[Chris Stauffer'2001]",1);
cvNamedWindow("三帧差分", 1);
cvNamedWindow("基于Bayes decision的方法[Liyuan Li'2003]", 1);
cvMoveWindow("原视频序列图像", 0, 0);
cvMoveWindow("不实时更新的Codebook算法[本文]", 360, 0);
cvMoveWindow("实时更新的Codebook算法[本文]", 720, 350);
cvMoveWindow("基于MOG的方法[Chris Stauffer'2001]", 0, 350);
cvMoveWindow("三帧差分", 720, 0);
cvMoveWindow("基于Bayes decision的方法[Liyuan Li'2003]",360, 350);
int nFrmNum = -1;
for(;;)
{
if(!pause)
{
rawImage = cvQueryFrame( capture );
++nFrmNum;
printf("第%d帧\n",nFrmNum);
if(!rawImage)
break;
}
if(singlestep)
{
pause = true;
}
if(0 == nFrmNum)
{
printf(". . . wait for it . . .\n");
temp1 = cvCreateImage(cvGetSize(rawImage), IPL_DEPTH_8U, 3);
temp2 = cvCreateImage(cvGetSize(rawImage), IPL_DEPTH_8U, 3);
result1 = cvCreateImage(cvGetSize(rawImage), IPL_DEPTH_8U, 1);
result2 = cvCreateImage(cvGetSize(rawImage), IPL_DEPTH_8U, 1);
result = cvCreateImage(cvGetSize(rawImage), IPL_DEPTH_8U, 1);
bg_model = cvCreateGaussianBGModel(rawImage);
bg_model1 = cvCreateFGDStatModel(rawImage);
rawImage1 = cvCreateImage( cvGetSize(rawImage), IPL_DEPTH_8U, 3 );
yuvImage = cvCloneImage(rawImage);
pFrImg = cvCreateImage( cvGetSize(rawImage), IPL_DEPTH_8U, 1 );
pFrImg1 = cvCreateImage( cvGetSize(rawImage), IPL_DEPTH_8U, 1 );
pFrImg2 = cvCreateImage( cvGetSize(rawImage), IPL_DEPTH_8U, 1 );
ImaskCodeBookCC = cvCreateImage( cvGetSize(rawImage), IPL_DEPTH_8U, 1 );
imageLen = rawImage->width*rawImage->height;
cA = new codeBook [imageLen];
cC = new codeBook [imageLen];
cD = new codeBook [imageLen];
for(int f = 0; f<imageLen; f++)
{
cA[f].numEntries = 0; cA[f].t = 0;
cC[f].numEntries = 0; cC[f].t = 0;
cD[f].numEntries = 0; cD[f].t = 0;
}
for(int nc=0; nc<nChannels;nc++)
{
cbBounds[nc] = 10;
}
ch[0] = true;
ch[1] = true;
ch[2] = true;
}
if( rawImage )
{
if(!pause)
{
cvSmooth(rawImage, rawImage1, CV_GAUSSIAN,3,3);
cvChangeDetection(temp1, temp2, result1);
cvChangeDetection(rawImage1, temp1, result2);
cvAnd(result1, result2, result, NULL);
cvCopy(temp1,temp2, NULL);
cvCopy(rawImage,temp1, NULL);
cvUpdateBGStatModel( rawImage, bg_model );
cvUpdateBGStatModel( rawImage, bg_model1 );
}
cvCvtColor( rawImage1, yuvImage, CV_BGR2YCrCb );
if( !pause && nFrmNum >= 1 && nFrmNum < T )
{
pColor = (uchar *)((yuvImage)->imageData);
for(int c=0; c<imageLen; c++)
{
update_codebook_model(pColor, cA[c],cbBounds,nChannels);
trainig_codebook(pColor, cC[c],cbBounds,nChannels);
pColor += 3;
}
}
if( nFrmNum == T)
{
for(c=0; c<imageLen; c++)
{
clear_stale_entries(cA[c]);
training_clear_stale_entries(cC[c]);
}
}
if(nFrmNum > T)
{
pColor = (uchar *)((yuvImage)->imageData);
uchar maskPixelCodeBook;
uchar maskPixelCodeBook1;
uchar maskPixelCodeBook2;
uchar *pMask = (uchar *)((pFrImg)->imageData);
uchar *pMask1 = (uchar *)((pFrImg1)->imageData);
uchar *pMask2 = (uchar *)((pFrImg2)->imageData);
for(int c=0; c<imageLen; c++)
{
//本文中不带自动背景更新的算法输出
maskPixelCodeBook1=background_Diff(pColor, cA[c],nChannels,minMod,maxMod);
*pMask1++ = maskPixelCodeBook1;
//本文中带自动背景更新的算法输出
if ( !pause && det_update_codebook_cC(pColor, cC[c],cbBounds,nChannels))
{
det_update_codebook_cD(pColor, cD[c],cbBounds,nChannels, nFrmNum);
realtime_clear_stale_entries_cD(cD[c], nFrmNum);
cD_to_cC(cD[c], cC[c], (nFrmNum - T)/5);
}
else
{
realtime_clear_stale_entries_cC(cC[c], nFrmNum);
}
maskPixelCodeBook2=background_Diff(pColor, cC[c],nChannels,minMod,maxMod);
*pMask2++ = maskPixelCodeBook2;
pColor += 3;
}
cvCopy(pFrImg2,ImaskCodeBookCC);
if(!pause)
{
count_Segmentation(cC,yuvImage,nChannels,minMod,maxMod);
forgratio = (float) (fgcount)/ imageLen;
}
}
bg_model1->foreground->origin=1;
bg_model->foreground->origin=1;
pFrImg->origin=1;
pFrImg1->origin=1;
pFrImg2->origin=1;
ImaskCodeBookCC->origin=1;
result->origin=1;
//connected_Components(pFrImg1,1,40);
//connected_Components(pFrImg2,1,40);
cvShowImage("基于MOG的方法[Chris Stauffer'2001]", bg_model->foreground);
cvShowImage( "原视频序列图像", rawImage );
cvShowImage("三帧差分", result);
cvShowImage( "不实时更新的Codebook算法[本文]",pFrImg1);
cvShowImage("实时更新的Codebook算法[本文]",pFrImg2);
cvShowImage("基于Bayes decision的方法[Liyuan Li'2003]", bg_model1->foreground);
c = cvWaitKey(1)&0xFF;
//End processing on ESC, q or Q
if(c == 27 || c == 'q' || c == 'Q')
break;
//Else check for user input
switch(c)
{
case 'h':
help();
break;
case 'p':
pause ^= 1;
break;
case 's':
singlestep = 1;
pause = false;
break;
case 'r':
pause = false;
singlestep = false;
break;
//CODEBOOK PARAMS
case 'y':
case '0':
ch[0] = 1;
ch[1] = 0;
ch[2] = 0;
printf("CodeBook YUV Channels active: ");
for(n=0; n<nChannels; n++)
printf("%d, ",ch[n]);
printf("\n");
break;
case 'u':
case '1':
ch[0] = 0;
ch[1] = 1;
ch[2] = 0;
printf("CodeBook YUV Channels active: ");
for(n=0; n<nChannels; n++)
printf("%d, ",ch[n]);
printf("\n");
break;
case 'v':
case '2':
ch[0] = 0;
ch[1] = 0;
ch[2] = 1;
printf("CodeBook YUV Channels active: ");
for(n=0; n<nChannels; n++)
printf("%d, ",ch[n]);
printf("\n");
break;
case 'a': //All
case '3':
ch[0] = 1;
ch[1] = 1;
ch[2] = 1;
printf("CodeBook YUV Channels active: ");
for(n=0; n<nChannels; n++)
printf("%d, ",ch[n]);
printf("\n");
break;
case 'b': //both u and v together
ch[0] = 0;
ch[1] = 1;
ch[2] = 1;
printf("CodeBook YUV Channels active: ");
for(n=0; n<nChannels; n++)
printf("%d, ",ch[n]);
printf("\n");
break;
case 'z':
printf(" Fadd加1 ");
Fadd += 1;
printf("Fadd=%.4d\n",Fadd);
break;
case 'x':
printf(" Fadd减1 ");
Fadd -= 1;
printf("Fadd=%.4d\n",Fadd);
break;
case 'n':
printf(" Tavgstale加1 ");
Tavgstale += 1;
printf("Tavgstale=%.4d\n",Tavgstale);
break;
case 'm':
printf(" Tavgstale减1 ");
Tavgstale -= 1;
printf("Tavgstale=%.4d\n",Tavgstale);
break;
case 'i': //modify max classification bounds (max bound goes higher)
for(n=0; n<nChannels; n++)
{
if(ch[n])
maxMod[n] += 1;
printf("%.4d,",maxMod[n]);
}
printf(" CodeBook High Side\n");
break;
case 'o': //modify max classification bounds (max bound goes lower)
for(n=0; n<nChannels; n++)
{
if(ch[n])
maxMod[n] -= 1;
printf("%.4d,",maxMod[n]);
}
printf(" CodeBook High Side\n");
break;
case 'k': //modify min classification bounds (min bound goes lower)
for(n=0; n<nChannels; n++)
{
if(ch[n])
minMod[n] += 1;
printf("%.4d,",minMod[n]);
}
printf(" CodeBook Low Side\n");
break;
case 'l': //modify min classification bounds (min bound goes higher)
for(n=0; n<nChannels; n++)
{
if(ch[n])
minMod[n] -= 1;
printf("%.4d,",minMod[n]);
}
printf(" CodeBook Low Side\n");
break;
}
}
}
cvReleaseCapture( &capture );
cvReleaseBGStatModel((CvBGStatModel**)&bg_model);
cvReleaseBGStatModel((CvBGStatModel**)&bg_model1);
cvDestroyWindow( "原视频序列图像" );
cvDestroyWindow( "不实时更新的Codebook算法[本文]");
cvDestroyWindow( "实时更新的Codebook算法[本文]");
cvDestroyWindow( "基于MOG的方法[Chris Stauffer'2001]");
cvDestroyWindow( "三帧差分" );
cvDestroyWindow( "基于Bayes decision的方法[Liyuan Li'2003]");
cvReleaseImage(&temp1);
cvReleaseImage(&temp2);
cvReleaseImage(&result);
cvReleaseImage(&result1);
cvReleaseImage(&result2);
cvReleaseImage(&pFrImg);
cvReleaseImage(&pFrImg1);
cvReleaseImage(&pFrImg2);
if(yuvImage) cvReleaseImage(&yuvImage);
if(rawImage) cvReleaseImage(&rawImage);
if(rawImage1) cvReleaseImage(&rawImage1);
if(ImaskCodeBookCC) cvReleaseImage(&ImaskCodeBookCC);
delete [] cA;
delete [] cC;
delete [] cD;
}
else
{
printf("\n\nDarn, Something wrong with the parameters\n\n"); help();
}
return 0;
}
// Function cvUpdateFGDStatModel updates statistical model and returns number of foreground regions
// parameters:
// curr_frame - current frame from video sequence
// p_model - pointer to CvFGDStatModel structure
static int CV_CDECL
icvUpdateFGDStatModel( IplImage* curr_frame, CvFGDStatModel* model, double )
{
int mask_step = model->Ftd->widthStep;
CvSeq *first_seq = NULL, *prev_seq = NULL, *seq = NULL;
IplImage* prev_frame = model->prev_frame;
int region_count = 0;
int FG_pixels_count = 0;
int deltaC = cvRound(model->params.delta * 256 / model->params.Lc);
int deltaCC = cvRound(model->params.delta * 256 / model->params.Lcc);
int i, j, k, l;
//clear storages
cvClearMemStorage(model->storage);
cvZero(model->foreground);
// From foreground pixel candidates using image differencing
// with adaptive thresholding. The algorithm is from:
//
// Thresholding for Change Detection
// Paul L. Rosin 1998 6p
// http://www.cis.temple.edu/~latecki/Courses/CIS750-03/Papers/thresh-iccv.pdf
//
cvChangeDetection( prev_frame, curr_frame, model->Ftd );
cvChangeDetection( model->background, curr_frame, model->Fbd );
for( i = 0; i < model->Ftd->height; i++ )
{
for( j = 0; j < model->Ftd->width; j++ )
{
if( ((uchar*)model->Fbd->imageData)[i*mask_step+j] || ((uchar*)model->Ftd->imageData)[i*mask_step+j] )
{
float Pb = 0;
float Pv = 0;
float Pvb = 0;
CvBGPixelStat* stat = model->pixel_stat + i * model->Ftd->width + j;
CvBGPixelCStatTable* ctable = stat->ctable;
CvBGPixelCCStatTable* cctable = stat->cctable;
uchar* curr_data = (uchar*)(curr_frame->imageData) + i*curr_frame->widthStep + j*3;
uchar* prev_data = (uchar*)(prev_frame->imageData) + i*prev_frame->widthStep + j*3;
int val = 0;
// Is it a motion pixel?
if( ((uchar*)model->Ftd->imageData)[i*mask_step+j] )
{
if( !stat->is_trained_dyn_model ) {
val = 1;
} else {
// Compare with stored CCt vectors:
for( k = 0; PV_CC(k) > model->params.alpha2 && k < model->params.N1cc; k++ )
{
if ( abs( V_CC(k,0) - prev_data[0]) <= deltaCC &&
abs( V_CC(k,1) - prev_data[1]) <= deltaCC &&
abs( V_CC(k,2) - prev_data[2]) <= deltaCC &&
abs( V_CC(k,3) - curr_data[0]) <= deltaCC &&
abs( V_CC(k,4) - curr_data[1]) <= deltaCC &&
abs( V_CC(k,5) - curr_data[2]) <= deltaCC)
{
Pv += PV_CC(k);
Pvb += PVB_CC(k);
}
}
Pb = stat->Pbcc;
if( 2 * Pvb * Pb <= Pv ) val = 1;
}
}
else if( stat->is_trained_st_model )
{
// Compare with stored Ct vectors:
for( k = 0; PV_C(k) > model->params.alpha2 && k < model->params.N1c; k++ )
{
if ( abs( V_C(k,0) - curr_data[0]) <= deltaC &&
abs( V_C(k,1) - curr_data[1]) <= deltaC &&
abs( V_C(k,2) - curr_data[2]) <= deltaC )
{
Pv += PV_C(k);
Pvb += PVB_C(k);
}
}
Pb = stat->Pbc;
if( 2 * Pvb * Pb <= Pv ) val = 1;
}
// Update foreground:
((uchar*)model->foreground->imageData)[i*mask_step+j] = (uchar)(val*255);
FG_pixels_count += val;
} // end if( change detection...
} // for j...
} // for i...
//end BG/FG classification
// Foreground segmentation.
// Smooth foreground map:
if( model->params.perform_morphing ){
cvMorphologyEx( model->foreground, model->foreground, 0, 0, CV_MOP_OPEN, model->params.perform_morphing );
cvMorphologyEx( model->foreground, model->foreground, 0, 0, CV_MOP_CLOSE, model->params.perform_morphing );
}
if( model->params.minArea > 0 || model->params.is_obj_without_holes ){
// Discard under-size foreground regions:
//
cvFindContours( model->foreground, model->storage, &first_seq, sizeof(CvContour), CV_RETR_LIST );
for( seq = first_seq; seq; seq = seq->h_next )
{
CvContour* cnt = (CvContour*)seq;
if( cnt->rect.width * cnt->rect.height < model->params.minArea ||
(model->params.is_obj_without_holes && CV_IS_SEQ_HOLE(seq)) )
{
// Delete under-size contour:
prev_seq = seq->h_prev;
if( prev_seq )
{
prev_seq->h_next = seq->h_next;
if( seq->h_next ) seq->h_next->h_prev = prev_seq;
}
else
{
first_seq = seq->h_next;
if( seq->h_next ) seq->h_next->h_prev = NULL;
}
}
else
{
region_count++;
}
}
model->foreground_regions = first_seq;
cvZero(model->foreground);
cvDrawContours(model->foreground, first_seq, CV_RGB(0, 0, 255), CV_RGB(0, 0, 255), 10, -1);
} else {
model->foreground_regions = NULL;
}
// Check ALL BG update condition:
if( ((float)FG_pixels_count/(model->Ftd->width*model->Ftd->height)) > CV_BGFG_FGD_BG_UPDATE_TRESH )
{
for( i = 0; i < model->Ftd->height; i++ )
for( j = 0; j < model->Ftd->width; j++ )
{
CvBGPixelStat* stat = model->pixel_stat + i * model->Ftd->width + j;
stat->is_trained_st_model = stat->is_trained_dyn_model = 1;
}
}
// Update background model:
for( i = 0; i < model->Ftd->height; i++ )
{
for( j = 0; j < model->Ftd->width; j++ )
{
CvBGPixelStat* stat = model->pixel_stat + i * model->Ftd->width + j;
CvBGPixelCStatTable* ctable = stat->ctable;
CvBGPixelCCStatTable* cctable = stat->cctable;
uchar *curr_data = (uchar*)(curr_frame->imageData)+i*curr_frame->widthStep+j*3;
uchar *prev_data = (uchar*)(prev_frame->imageData)+i*prev_frame->widthStep+j*3;
if( ((uchar*)model->Ftd->imageData)[i*mask_step+j] || !stat->is_trained_dyn_model )
{
float alpha = stat->is_trained_dyn_model ? model->params.alpha2 : model->params.alpha3;
float diff = 0;
int dist, min_dist = 2147483647, indx = -1;
//update Pb
stat->Pbcc *= (1.f-alpha);
if( !((uchar*)model->foreground->imageData)[i*mask_step+j] )
{
stat->Pbcc += alpha;
}
// Find best Vi match:
for(k = 0; PV_CC(k) && k < model->params.N2cc; k++ )
{
// Exponential decay of memory
PV_CC(k) *= (1-alpha);
PVB_CC(k) *= (1-alpha);
if( PV_CC(k) < MIN_PV )
{
PV_CC(k) = 0;
PVB_CC(k) = 0;
continue;
}
dist = 0;
for( l = 0; l < 3; l++ )
{
int val = abs( V_CC(k,l) - prev_data[l] );
if( val > deltaCC ) break;
dist += val;
val = abs( V_CC(k,l+3) - curr_data[l] );
if( val > deltaCC) break;
dist += val;
}
if( l == 3 && dist < min_dist )
{
min_dist = dist;
indx = k;
}
}
if( indx < 0 )
{ // Replace N2th elem in the table by new feature:
indx = model->params.N2cc - 1;
PV_CC(indx) = alpha;
PVB_CC(indx) = alpha;
//udate Vt
for( l = 0; l < 3; l++ )
{
V_CC(indx,l) = prev_data[l];
V_CC(indx,l+3) = curr_data[l];
}
}
else
{ // Update:
PV_CC(indx) += alpha;
if( !((uchar*)model->foreground->imageData)[i*mask_step+j] )
{
PVB_CC(indx) += alpha;
}
}
//re-sort CCt table by Pv
for( k = 0; k < indx; k++ )
{
if( PV_CC(k) <= PV_CC(indx) )
{
//shift elements
CvBGPixelCCStatTable tmp1, tmp2 = cctable[indx];
for( l = k; l <= indx; l++ )
{
tmp1 = cctable[l];
cctable[l] = tmp2;
tmp2 = tmp1;
}
break;
}
}
float sum1=0, sum2=0;
//check "once-off" changes
for(k = 0; PV_CC(k) && k < model->params.N1cc; k++ )
{
sum1 += PV_CC(k);
sum2 += PVB_CC(k);
}
if( sum1 > model->params.T ) stat->is_trained_dyn_model = 1;
diff = sum1 - stat->Pbcc * sum2;
// Update stat table:
if( diff > model->params.T )
{
//printf("once off change at motion mode\n");
//new BG features are discovered
for( k = 0; PV_CC(k) && k < model->params.N1cc; k++ )
{
PVB_CC(k) =
(PV_CC(k)-stat->Pbcc*PVB_CC(k))/(1-stat->Pbcc);
}
assert(stat->Pbcc<=1 && stat->Pbcc>=0);
}
}
// Handle "stationary" pixel:
if( !((uchar*)model->Ftd->imageData)[i*mask_step+j] )
{
float alpha = stat->is_trained_st_model ? model->params.alpha2 : model->params.alpha3;
float diff = 0;
int dist, min_dist = 2147483647, indx = -1;
//update Pb
stat->Pbc *= (1.f-alpha);
if( !((uchar*)model->foreground->imageData)[i*mask_step+j] )
{
stat->Pbc += alpha;
}
//find best Vi match
for( k = 0; k < model->params.N2c; k++ )
{
// Exponential decay of memory
PV_C(k) *= (1-alpha);
PVB_C(k) *= (1-alpha);
if( PV_C(k) < MIN_PV )
{
PV_C(k) = 0;
PVB_C(k) = 0;
continue;
}
dist = 0;
for( l = 0; l < 3; l++ )
{
int val = abs( V_C(k,l) - curr_data[l] );
if( val > deltaC ) break;
dist += val;
}
if( l == 3 && dist < min_dist )
{
min_dist = dist;
indx = k;
}
}
if( indx < 0 )
{//N2th elem in the table is replaced by a new features
indx = model->params.N2c - 1;
PV_C(indx) = alpha;
PVB_C(indx) = alpha;
//udate Vt
for( l = 0; l < 3; l++ )
{
V_C(indx,l) = curr_data[l];
}
} else
{//update
PV_C(indx) += alpha;
if( !((uchar*)model->foreground->imageData)[i*mask_step+j] )
{
PVB_C(indx) += alpha;
}
}
//re-sort Ct table by Pv
for( k = 0; k < indx; k++ )
{
if( PV_C(k) <= PV_C(indx) )
{
//shift elements
CvBGPixelCStatTable tmp1, tmp2 = ctable[indx];
for( l = k; l <= indx; l++ )
{
tmp1 = ctable[l];
ctable[l] = tmp2;
tmp2 = tmp1;
}
break;
}
}
// Check "once-off" changes:
float sum1=0, sum2=0;
for( k = 0; PV_C(k) && k < model->params.N1c; k++ )
{
sum1 += PV_C(k);
sum2 += PVB_C(k);
}
diff = sum1 - stat->Pbc * sum2;
if( sum1 > model->params.T ) stat->is_trained_st_model = 1;
// Update stat table:
if( diff > model->params.T )
{
//printf("once off change at stat mode\n");
//new BG features are discovered
for( k = 0; PV_C(k) && k < model->params.N1c; k++ )
{
PVB_C(k) = (PV_C(k)-stat->Pbc*PVB_C(k))/(1-stat->Pbc);
}
stat->Pbc = 1 - stat->Pbc;
}
} // if !(change detection) at pixel (i,j)
// Update the reference BG image:
if( !((uchar*)model->foreground->imageData)[i*mask_step+j])
{
uchar* ptr = ((uchar*)model->background->imageData) + i*model->background->widthStep+j*3;
if( !((uchar*)model->Ftd->imageData)[i*mask_step+j] &&
!((uchar*)model->Fbd->imageData)[i*mask_step+j] )
{
// Apply IIR filter:
for( l = 0; l < 3; l++ )
{
int a = cvRound(ptr[l]*(1 - model->params.alpha1) + model->params.alpha1*curr_data[l]);
ptr[l] = (uchar)a;
//((uchar*)model->background->imageData)[i*model->background->widthStep+j*3+l]*=(1 - model->params.alpha1);
//((uchar*)model->background->imageData)[i*model->background->widthStep+j*3+l] += model->params.alpha1*curr_data[l];
}
}
else
{
// Background change detected:
for( l = 0; l < 3; l++ )
{
//((uchar*)model->background->imageData)[i*model->background->widthStep+j*3+l] = curr_data[l];
ptr[l] = curr_data[l];
}
}
}
} // j
} // i
// Keep previous frame:
cvCopy( curr_frame, model->prev_frame );
return region_count;
}
// Function updateBGMeanStatModel updates model and returns number of foreground regions
// parameters:
// curr_frame - current frame from video sequence
// p_model - pointer to BGMeanStatModel structure
int
updateBGMeanStatModel( IplImage* curr_frame, BGMeanStatModel* model ){
int region_count = 0;
if (model->bg_frame_count >= model->params.bg_update_rate){
model->bg_frame_count = 0;//reset counter
//update model
//insert curr_frame in circular buffer
int i,j,k;
int frame_cbuffer_pixelcluster_step = model->params.n_frames*model->background->nChannels;
int frame_cbuffer_cbufferpixel_offset = model->cbuffer_idx*model->background->nChannels;
int frame_cbuffer_width_step = model->background->width*frame_cbuffer_pixelcluster_step;
cv::Scalar mean, std_dev;
//idx_last is used to avoid calc mean over not initialized values
if (model->cbuffer_nentries_init < model->params.n_frames)
model->cbuffer_nentries_init++;
//bg and curr_frame have same size
for (i = 0; i < model->background->height; i++){//rows
uchar* frame_cbuffer_row_p = model->frame_cbuffer + i*frame_cbuffer_width_step;
uchar* curr_frame_row_p = (uchar*)curr_frame->imageData + i*curr_frame->widthStep;
uchar* bg_frame_row_p = (uchar*)model->background->imageData + i*model->background->widthStep;
for (j = 0; j < model->background->width; j++){//cols
uchar* pixel_cluster_p = frame_cbuffer_row_p + j*frame_cbuffer_pixelcluster_step;
uchar* pixel_to_update_p = pixel_cluster_p + frame_cbuffer_cbufferpixel_offset;//pointer to pixel in circular buffer to update
uchar* curr_pixel_p = curr_frame_row_p + j*model->background->nChannels;//pixel from curr_frame
//update circular buffer
for (k=0; k<model->background->nChannels; k++)
pixel_to_update_p[k] = curr_pixel_p[k];
//calc mean and std dev
cv::Mat pixel_cluster(1, std::min(model->params.n_frames,model->cbuffer_nentries_init),
CV_MAKETYPE(CV_8U,model->background->nChannels),
pixel_cluster_p);/*cv::Mat with pixel cluster with last n frames*/
cv::meanStdDev(pixel_cluster, mean, std_dev);
int pixel_offset = j*model->background->nChannels + (i * model->background->width * model->background->nChannels);
//double* mean_p = model->mean + pixel_offset;
//double* std_dev_p = model->std_dev + pixel_offset;
uchar* bg_p = bg_frame_row_p + j*model->background->nChannels;
/*copy mean and std dev to each channel*/
for (k=0; k<model->background->nChannels; k++){
//mean_p[k] = mean[k];
//std_dev_p[k] = std_dev[k];
double mean_weight = get_mean_weight(std_dev[k]);
double a = ((double)bg_p[k])*(1-mean_weight);
double b = mean[k]*mean_weight;
bg_p[k] = cv::saturate_cast<uchar>(a+b);
}
}
}
//update circular buffer idx
model->cbuffer_idx++;
if (model->cbuffer_idx >= model->params.n_frames)
model->cbuffer_idx = 0;
}
if (model->fg_frame_count >= model->params.fg_update_rate){
model->fg_frame_count = 0;//reset counter
//clear fg
cvZero(model->foreground);
//difference bg - curr_frame. Adaptative threshold
cvChangeDetection( model->background, curr_frame, model->foreground );//FIXME: just 3 channel support
//segmentation if required
if (model->params.perform_segmentation)
region_count = bgfgSegmentation((CvBGStatModel*)model, &model->params.sg_params);
}
//update counters
model->fg_frame_count++;
model->bg_frame_count++;
return region_count;
}