/// <summary>
/// 画外接矩
/// </summary>
private void DrawContourRectangle(ContoursArgs e)
{
VectorOfPoint cnt = e.Contours[e.ContourIndex];
Rectangle rectangle = CvInvoke.BoundingRectangle(cnt);
CvInvoke.Rectangle(mTempImage, rectangle, e.Color, e.Thickness);
}
/// <summary>
/// 画最小外接圆
/// </summary>
private void DrawContourCircle(ContoursArgs e)
{
VectorOfPoint cnt = e.Contours[e.ContourIndex];
CircleF circleF = CvInvoke.MinEnclosingCircle(cnt);
//取整
Point center = Point.Round(circleF.Center);
CvInvoke.Circle(mTempImage, center, (int)circleF.Radius, e.Color, e.Thickness);
}
private void FrmContours_PassValuesEvent(object sender, ContoursArgs e)
{
if (e.InitPicture)
{
//原图是彩色图，先转成灰度图
if (mCurrentImage.NumberOfChannels != 1)
{
CvInvoke.CvtColor(mCurrentImage, mTempImage, ColorConversion.Bgr2Gray);
}
else
{
mTempImage = mCurrentImage.Clone();
}
//如果层叠显示，那么只初始化一次
e.InitPicture = !e.CascadeDrawing;
}
//为了绘制，再转成彩色图
if (mTempImage.NumberOfChannels == 1)
{
CvInvoke.CvtColor(mTempImage, mTempImage, ColorConversion.Gray2Bgr);
}
switch (e.FeatureType)
{
case ContourFeatureType.Contour:
DrawContourContours(e);
break;
case ContourFeatureType.Rectangle:
DrawContourRectangle(e);
break;
case ContourFeatureType.MinRectangle:
DrawContourMinRectangle(e);
break;
case ContourFeatureType.MinCircle:
DrawContourCircle(e);
break;
default:
/* Do Nothing */
break;
}
mFrmMainImage.SetImageSource(mTempImage);
}
/// <summary>
/// 画最小外接矩
/// </summary>
private void DrawContourMinRectangle(ContoursArgs e)
{
VectorOfPoint cnt = e.Contours[e.ContourIndex];
RotatedRect rotatedRect = CvInvoke.MinAreaRect(cnt);
PointF[] pointF = CvInvoke.BoxPoints(rotatedRect);
//取整
Point[] pointInt = new Point[pointF.Length];
for (int i = 0; i < pointF.Length; i++)
{
pointInt[i] = Point.Round(pointF[i]);
}
VectorOfPoint vector = new VectorOfPoint(pointInt);
VectorOfVectorOfPoint vector2 = new VectorOfVectorOfPoint(vector);
CvInvoke.DrawContours(mTempImage, vector2, -1, e.Color, e.Thickness);
}
/// <summary>
/// 画轮廓
/// </summary>
private void DrawContourContours(ContoursArgs e)
{
CvInvoke.DrawContours(mTempImage, e.Contours, e.ContourIndex, e.Color, e.Thickness);
}
