/// <summary>
/// 霍夫直线变换
/// </summary>
private void DrawHoughLines(HoughsArgs e)
{
VectorOfPointF lines = new VectorOfPointF();
CvInvoke.HoughLines(mTempImage, lines, e.Rho, Math.PI / 180, e.Threshold);
//便于绘制，再转成彩色图
CvInvoke.CvtColor(mTempImage, mTempImage, ColorConversion.Gray2Bgr);
for (int i = 0; i < lines.Size; i++)
{
double rho = lines[i].X;
double theta = lines[i].Y;
double a = Math.Cos(theta);
double b = Math.Sin(theta);
double x0 = a * rho;
double y0 = b * rho;
int x1 = (int)(x0 + 1000 * (-b));
int y1 = (int)(y0 + 1000 * (a));
int x2 = (int)(x0 - 1000 * (-b));
int y2 = (int)(y0 - 1000 * (a));
CvInvoke.Line(mTempImage, new Point(x1, y1), new Point(x2, y2), e.Color, e.Thickness);
}
}
private void FrmHoughs_PassValuesEvent(object sender, HoughsArgs e)
{
mTempImage = mCurrentImage.Clone();
//如果是彩色图，先灰度化
if (mTempImage.NumberOfChannels != 1)
{
CvInvoke.CvtColor(mTempImage, mTempImage, ColorConversion.Bgr2Gray);
}
switch (e.HoughTransType)
{
case HoughTransformType.Line:
DrawHoughLines(e);
break;
case HoughTransformType.LineP:
DrawHoughLinesP(e);
break;
case HoughTransformType.Circle:
DrawHoughCircles(e);
break;
default:
break;
}
mFrmMainImage.SetImageSource(mTempImage);
}
/// <summary>
/// 霍夫圆变换
/// </summary>
private void DrawHoughCircles(HoughsArgs e)
{
VectorOfPointF vectorOfPointF = new VectorOfPointF();
CvInvoke.HoughCircles(mTempImage, vectorOfPointF, HoughType.Gradient, 1, e.Threshold);
//ToDo: 霍夫圆变换效果无效，原因未明
for (int i = 0; i < vectorOfPointF.Size; i++)
{
//var a = "fs";
}
}
/// <summary>
/// 统计概率霍夫直线变换
/// </summary>
private void DrawHoughLinesP(HoughsArgs e)
{
LineSegment2D[] lines = CvInvoke.HoughLinesP(mTempImage, e.Rho, Math.PI / 180, e.Threshold);
//便于绘制，再转成彩色图
CvInvoke.CvtColor(mTempImage, mTempImage, ColorConversion.Gray2Bgr);
for (int i = 0; i < lines.Length; i++)
{
CvInvoke.Line(mTempImage, lines[i].P1, lines[i].P2, e.Color, e.Thickness);
}
}
