C# opencv

C#使用OpenCV的一些代码如下：

1. 需要加头文件

using OpenCvSharp;

2. 读取图片

Mat img1 = new Mat("F:\\all_truck\\truck_3.jpg", ImreadModes.Color);
Cv2.ImShow("win1", img1);
Cv2.WaitKey(0);

3. 定义一个没有初始化的图片作为复制

Mat pBkImage_copy = new Mat();
pBkImage.CopyTo(pBkImage_copy);

4. 灰度化

Cv2.CvtColor(img1, img1, ColorConversionCodes.BGR2GRAY);

5. 高斯模糊和size数据格式的定义

Size ksize = new Size(5, 5);
Cv2.GaussianBlur(img1, img1, ksize, 0);

6. 二值化

Cv2.Threshold(img1, img1, 128, 255, ThresholdTypes.Binary);

7. 开闭运算

Mat kernel = Cv2.GetStructuringElement(MorphShapes.Rect, new Size(3, 3));
Cv2.MorphologyEx(img1, img1, MorphTypes.Open, kernel);

8. FindContours查找轮廓和contours参数的定义和操作

Point[][] contours;
HierarchyIndex[] hierarchy;
Cv2.FindContours(img1, out contours, out hierarchy, RetrievalModes.External, ContourApproximationModes.ApproxSimple);

9. Rect和Size格式的定义

Rect rect = Cv2.BoundingRect(contours[0]);
Size size = new Size(rect.Width, rect.Height);

10. resize函数在图片上画矩形框在图片上画直线

Cv2.Rectangle(img1, rect, Scalar.Red, 2);
Cv2.Line(img1, new Point(0, 0), new Point(img1.Width, img1.Height), Scalar.Blue, 2);