private CvLineSegmentPoint[] detectLinesFromCanny(CvMat roi)
{
CvMat edgesMat = MatOps.CopySize(roi, MatrixType.U8C1);
roi.Canny(edgesMat, 10, 200, ApertureSize.Size3); // Size5 also works good; 7 not; rest crash!
// these values work fine with "box7.png"
double rho = 1; // 1
double theta = 1 * Cv.PI / 180; // 1*Cv.PI/180
int threshold = 75; // 75 (quality)
double minLength = 1; // 1
double maxGap = 10000; // 1000000, but not Infinity, for some dumb reason
CvLineSegmentPoint[] lines = edgesMat.HoughLinesProbabilistic(rho, theta, threshold, minLength, maxGap);
CvMat linesMat = MatOps.CopySize(edgesMat, MatrixType.U8C3, 0);
for (int i = 0; i < lines.Length; ++i)
{
linesMat.Line(lines[i].P1, lines[i].P2, Const.ScalarRandom(), 3, LineType.AntiAlias);
}
//MatOps.NewWindowShow( edgesMat, "edgesMat Canny-Hough" );
MatOps.NewWindowShow(linesMat, "linesMat");
Console.WriteLine("====================");
Console.WriteLine("detectLinesFromCanny");
Console.WriteLine("lines=" + lines.Length);
Console.WriteLine("====================");
return(lines);
}
