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//////////////////////////////////////////////////////////////////////////
//判断轮廓是不是一个圆,通过轮廓的面积pi*r*r的差异,判断是不是圆。
//contour:输入轮廓
//minRadius: 半径长度至少大于minRadius
//////////////////////////////////////////////////////////////////////////
BOOL isCircleContour(vector<Point>& contour,double minRadius)
{
BOOL isCircle = FALSE;
//double perimeter = arcLength(contour,TRUE);
double perimeter = arcLength(contour,FALSE);
double perimeter2 = arcLength(contour,TRUE);
Rect rect =boundingRect(contour);
double r = (rect.width+rect.height)/4.0; //半径约等于轮廓外接矩的边长/2
double area=contourArea(contour);
double pi=3.1415926;
//cout<<"x/y/width/height\t"<<rect.x<<" "<<rect.y<<" "<<rect.width<<" "<<rect.height<<endl;
//cout<<"perimeter:FALSE\t"<<perimeter<<endl;
//cout<<"perimeter2:TRUE\t"<<perimeter2<<endl;
//cout<<"area:\t"<<area<<endl;
//cout<<"r: "<<r<<" 计算出周长: "<<2*pi*r<<" 计算出面积: "<<pi*r*r<<endl;
double perimeterDiffRatio = fabs(2*pi*r - perimeter)*2.0/(2*pi*r + perimeter) *100;
double areaDiffRatio = fabs(pi*r*r - area)*2.0/(pi*r*r + area) *100;
double sideDiffRatio = abs(rect.width-rect.height)*2.0/(rect.width+rect.height)*100;
//CString CstrInfo3;
//CstrInfo3.Format(_T(" perimeterDiffRatio: %f\n areaDiffRatio: %f \n sideDiffRatio:%f"),perimeterDiffRatio,areaDiffRatio,sideDiffRatio);
//AfxMessageBox(CstrInfo3);
if (r>minRadius)
{
cout<<"周长差异百分比: "<<perimeterDiffRatio<<"%"<<endl;;
cout<<"面积差异百分比: "<<areaDiffRatio<<"%"<<endl;
cout<<"边长差异百分比: "<<sideDiffRatio<<"%"<<endl;;
cout<<endl<<endl;
}
//原始的
//const double areaDiffThresh = 18.0; //目前统计的,最大的面积差2.58%
//const double perimeterDiffThresh = 15; //目前统计的,最大的周长差5.65%
//const double sideDiffThresh = 15; //目前统计的,最大的边长差7.3%
//const double avgDiffThresh = 15.0; //三个差异比值的加权平均要求小于5.0;
const double areaDiffThresh = 5; //目前统计的,最大的面积差2.58%
const double perimeterDiffThresh =7.25; //目前统计的,最大的周长差5.65%
const double sideDiffThresh = 10; //目前统计的,最大的边长差7.3%
const double avgDiffThresh = 5.0; //三个差异比值的加权平均要求小于5.0;
double avdDiffRatio = (areaDiffRatio+perimeterDiffRatio+sideDiffRatio)/3.0;
//计算出的轮廓周长是半径的2*pi倍数
if( (areaDiffRatio <areaDiffThresh)
&& (perimeterDiffRatio <perimeterDiffThresh)
&& (sideDiffRatio <sideDiffThresh)
&&(avdDiffRatio<avgDiffThresh)
&& (r>minRadius) )
{
isCircle = TRUE;
}
return isCircle;
}