本文介绍了一种使用 OpenCV 计算一组二维点集的最小面积外接矩形的方法。通过将点集转换为 OpenCV 的矩阵形式并调用 cvMinAreaRect2 函数，可以高效地获得该矩形的相关参数。
int count = filteredPoints.size();
CvPoint pt0, pt;
CvBox2D box;
//int count = 4;
CvPoint* points = (CvPoint*)malloc( count * sizeof(points[0]));
CvMat pointMat = cvMat( 1, count, CV_32SC2, points );
for(int i = 0; i < count; i++ )
{
pt0.x = filteredPoints[i].x;
pt0.y = filteredPoints[i].y;
points[i] = pt0;
}
box = cvMinAreaRect2( &pointMat, 0 );
CvPoint pt0, pt;
CvBox2D box;
//int count = 4;
CvPoint* points = (CvPoint*)malloc( count * sizeof(points[0]));
CvMat pointMat = cvMat( 1, count, CV_32SC2, points );
for(int i = 0; i < count; i++ )
{
pt0.x = filteredPoints[i].x;
pt0.y = filteredPoints[i].y;
points[i] = pt0;
}
box = cvMinAreaRect2( &pointMat, 0 );
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