应用霍夫变换后在图像上绘制圆圈？ | 应用霍夫变换后在图像上绘制圆圈

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问题描述

我正在使用AForge的HoughCircleTransformation类来检测圆圈。我想在检测到圆圈的图像上绘制圆圈（以突出显示原始图像上的圆圈）。我如何修改'foreach循环'来做到这一点？

I'm using HoughCircleTransformation class of AForge to detect circles. I want to draw circles on the image where the circles are detected (to highlight the circles on the original image). How can i modify the 'foreach loop' to do that?

public Bitmap hough(Bitmap bmp)
   {
       HoughCircleTransformation circleTransform = new HoughCircleTransformation(35);
       // apply Hough circle transform
       circleTransform.ProcessImage(bmp);
       Bitmap houghCirlceImage = circleTransform.ToBitmap();
       // get circles using relative intensity
       HoughCircle[] circles = circleTransform.GetCirclesByRelativeIntensity(0.5);
       int numCircles = circleTransform.CirclesCount;
       MessageBox.Show("Number of circles found : " + numCircles.ToString());
       foreach (HoughCircle circle in circles)
       {

         //code to draw circle
       }
       return bmp;
   }

推荐答案

MessageBox.Show("Number of circles found : " + numCircles.ToString());
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bmp);
foreach (HoughCircle circle in circles)
{
    g.DrawEllipse(Pens.Green, circle.GetTheThingsCoordinates());
    //code to draw circle
}

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