最常用的方式是:
Cv2.ImRead() 可以将位图文件转成Mat数据格式
Cv2.ImWrite() 可以将Mat数据格式保存到位图文件.
不通过读写文件作为转换介质的方法:
private void testMatToPicture()
{
var mat = Cv2.ImRead("D:\\my_workspace\\opencv\\images\\lena.jpg", ImreadModes.Color);
//方法1: Mat -> Bitmap class
Bitmap bitmap = OpenCvSharp.Extensions.BitmapConverter.ToBitmap(mat);
bitmap.Save("D:\\my_workspace\\opencv\\images\\1lena3.jpg", ImageFormat.Jpeg);
//方法2: Mat -> byte[]
byte[] bytes = mat.ToBytes(".jpg");
System.IO.File.WriteAllBytes("D:\\my_workspace\\opencv\\images\\1lena4.jpg", bytes);
}
private void testPictureToMat()
{
// byte[] -> Mat
var bytes = System.IO.File.ReadAllBytes("D:\\my_workspace\\opencv\\images\\lena.jpg");
var colorMat = Mat.FromImageData(bytes, ImreadModes.Color);
var grayMat = Mat.FromImageData(bytes, ImreadModes.Grayscale);
// Bitmap class -> Mat
Bitmap bitmap = new Bitmap("D:\\my_workspace\\opencv\\images\\lena.jpg");
var mat2 = OpenCvSharp.Extensions.BitmapConverter.ToMat(bitmap);
Cv2.ImShow("colorMat", colorMat);
Cv2.ImShow("grayMat", grayMat);
Cv2.ImShow("mat2", mat2);
Cv2.WaitKey();
Cv2.DestroyAllWindows();
)
}