Question

我正在使用emguCV查找轮廓基本点，然后将此点保存在文件中，用户将来重绘此形状。所以，我的目标是这个形象：

我的解决方案是这样的： 1.将图像导入图片框 2.使用canny算法进行边缘检测 3.找到轮廓并保存点

我在下面的代码中找到了很多分数但是我不能用这一点绘制第一个形状！

using Emgu.CV;
using Emgu.Util;

private void button1_Click(object sender, EventArgs e)

{
            Bitmap bmp = new Bitmap(pictureBox1.Image);
            Image<Bgr, Byte> img = new Image<Bgr, byte>(bmp);

            Image<Gray, Byte> gray = img.Convert<Gray, Byte>().PyrDown().PyrUp();

            Gray cannyThreshold = new Gray(80);
            Gray cannyThresholdLinking = new Gray(120);
            Gray circleAccumulatorThreshold = new Gray(120);

            Image<Gray, Byte> cannyEdges = gray.Canny(cannyThreshold, cannyThresholdLinking).Not();

            Bitmap color;
            Bitmap bgray;
            IdentifyContours(cannyEdges.Bitmap, 50, true, out bgray, out color);

            pictureBox1.Image = color;
        }

        public void IdentifyContours(Bitmap colorImage, int thresholdValue, bool invert, out Bitmap processedGray, out Bitmap processedColor)
        {
            Image<Gray, byte> grayImage = new Image<Gray, byte>(colorImage);
            Image<Bgr, byte> color = new Image<Bgr, byte>(colorImage);

            grayImage = grayImage.ThresholdBinary(new Gray(thresholdValue), new Gray(255));

            if (invert)
            {
                grayImage._Not();
            }

            using (MemStorage storage = new MemStorage())
            {

                for (Contour<Point> contours = grayImage.FindContours(Emgu.CV.CvEnum.CHAIN_APPROX_METHOD.CV_CHAIN_APPROX_SIMPLE, Emgu.CV.CvEnum.RETR_TYPE.CV_RETR_LIST, storage); contours != null; contours = contours.HNext)
                {

                    Contour<Point> currentContour = contours.ApproxPoly(contours.Perimeter * 0.015, storage);
                    if (currentContour.BoundingRectangle.Width > 20)
                    {
                        CvInvoke.cvDrawContours(color, contours, new MCvScalar(255), new MCvScalar(255), -1, 1, Emgu.CV.CvEnum.LINE_TYPE.EIGHT_CONNECTED, new Point(0, 0));
                        color.Draw(currentContour.BoundingRectangle, new Bgr(0, 255, 0), 1);
                    }

                    Point[] pts = currentContour.ToArray();
                    foreach (Point p in pts)
                    {
                        //add points to listbox
                        listBox1.Items.Add(p);
                    }
                }
            }

            processedColor = color.ToBitmap();
            processedGray = grayImage.ToBitmap();

        }

Answer 1

在您的代码中添加了轮廓近似操作

Contour<Point> currentContour = contours.ApproxPoly(contours.Perimeter * 0.015, storage);

此轮廓近似值为approximate your Contour到nearest polygon＆amp;所以你的实际分数已经转移了。如果要重现相同的图像，则无需进行任何近似。

Refer this thread.

在emgucv中查找轮廓点

1 个答案: