opencv 图像阴影检测

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参数说明：

IplImage *workImg-当前全局变量,表示正在显示的图片。

downleft, upright- 检测出的阴影部分矩形框的两个对角顶点。

/*********************************************/ //阴影检测/*********************************************/CvPoint downleft,upright;int cnt;int dir[8][2]={-1,-1,-1,0,-1,1,0,1,0,-1,1,1,1,0,1,-1};#define SHADOW 170#define Thres_KindNumber 20bool InRange(CvPoint point,IplImage* pi) {int w=pi->width;int h=pi->height;if(point.x>=0&&point.x<w&&point.y>=0&&point.y<h){float  v[3];for(i=0;i<3;i++){v[i]=((uchar*)(pi->imageData + pi->widthStep*point.y))[point.x*3+i];if(v[i]<=SHADOW)return true;}}return false;}void Dye(IplImage** curimg,CvPoint s){int i;queue<CvPoint>Q;Q.push(s);for(i=0;i<3;i++)((uchar*)((*curimg)->imageData + (*curimg)->widthStep*s.y))[s.x*3+i]=SHADOW+10;while(!Q.empty()){s=Q.front();Q.pop();if(s.x<downleft.x)downleft.x=s.x;if(s.y<downleft.y)downleft.y=s.y;if(s.x>upright.x)upright.x=s.x;if(s.y>upright.y)upright.y=s.y;//dye aroundfor(i=0;i<8;i++){CvPoint now=cvPoint(s.x+dir[i][0],s.y+dir[i][1]);if(InRange(now,*curimg)){Q.push(now);cnt++;for(i=0;i<3;i++)((uchar*)((*curimg)->imageData + (*curimg)->widthStep*now.y))[now.x*3+i]=SHADOW+10;}}}}void CCVMFCView::OnShadowDetect(){//detect shadows,find the region with highest pixel valueint x,y;srcimg=workImg;for(y=0;y<srcimg->height;y++)for(x=0;x<srcimg->width;x++){CvPoint curp=cvPoint(x,y);downleft.x=srcimg->width;downleft.y=srcimg->height;upright.x=upright.y=0;cnt=0;if(InRange(curp,srcimg))Dye(&srcimg,curp);if(cnt>Thres_KindNumber)cvRectangle(workImg , downleft,upright,CV_RGB(0,255,0),1,CV_AA,0);}Invalidate();}