AForge霍夫变换

Question

我正在尝试做一个关于如何使用AForge的HoughTransformation类的实验。我正在使用这个类来尝试计算图像上的圆圈的数量。但我总是收到这样的错误信息:源图像的像素格式不受支持。下面是我的代码：

private void CountCircles(Bitmap sourceImage)
{
    HoughCircleTransformation circleTransform = new HoughCircleTransformation(15);
    circleTransform.ProcessImage(sourceImage);
    Bitmap houghCircleImage = circleTransform.ToBitmap();
    int numCircles = circleTransform.CirclesCount;
    MessageBox.Show("Number of circles found : "+numCircles.ToString());
}

Answer 1

HoughCircleTransformation需要一个二进制位图。

private void CountCircles(Bitmap sourceImage)
{
    var filter = new FiltersSequence(new IFilter[]
    {
      Grayscale.CommonAlgorithms.BT709,                                                     
      new Threshold(0x40)
    });
    var binaryImage = filter.Apply(bitmap);
    HoughCircleTransformation circleTransform = new HoughCircleTransformation(15);
    circleTransform.ProcessImage(binaryImage);
    Bitmap houghCircleImage = circleTransform.ToBitmap();
    int numCircles = circleTransform.CirclesCount;
    MessageBox.Show("Number of circles found : "+numCircles.ToString());
}