OpenCV中Mat类型与C#中Bitmap类型的转换
OpenCV类型中图像的处理
readImage = imread(imgpath, IMREAD_GRAYSCALE);
threshold(readImage,outputImage, 0, 255, THRESH_BINARY | THRESH_OTSU);
tmp = outputImage.clone();
uchar* imgdata = new uchar[tmp.rows*tmp.cols * 3];
imgdata = tmp.data;
width = tmp.size().width;
height = tmp.size().height;
step = tmp.step;
data = imgdata;
关键点：最后的data数据类型为uchar*& 类型，定义如下：
char*& data;
若是只定义为char*类型，则只指向了图像头部指针，在外层调用时为空。
C#类型中图像的处理
[DllImport("XXXXXXXX.dll")]
public static extern void Run(string imgpath, out int width, out int height, out int step,out IntPtr data);
//运行方法
IntPtr imgData;
Run(imgPath,out width,out height,out step,out imgData);
Bitmap bmp = new Bitmap(width, height, step, System.Drawing.Imaging.PixelFormat.Format8bppIndexed, imgData);
bmp.Save("D:/0803.bmp");
关键点：函数参数的定义，定义为引用的指针。