C#Bitmap和C++ opencv Mat相互转换
C#调用C++编译成的dll，这个dll中包含Opencv个的Mat到c#的Bitmap转换，具体代码如下：
C++部分：
首先创建win32应用程序，选择类库模板
DLL_APIuchar * _stdcall run1(char* filename, int&width, int&height, int&step) {
IplImage* uu = cvLoadImage(filename);
IplImage* dst1 = cvCreateImage(cvSize(uu->width, uu->height), 8, 1); cvCvtColor(uu, dst1, CV_RGB2GRAY); Matss = cvarrToMat(uu);
uchar * data = new uchar[uu->width*uu->height * 3]; data = ss.data;
width = ss.size().width; height = ss.size().height; step = ss.step; return data; }
C#中调用这个dll
[DllImport(@\vAssemblies.dll\)]
publicstaticexternIntPtr run1(string a, outint width, outint height, outint step);
至此完成C++ Mat到Bitmap的转换
下面是Bitmap 到 Mat的转换 C# 部分
publicstaticBitmapInfoGetImagePixel(Bitmap Source) { byte[] result; int step;
intiWidth = Source.Width; intiHeight = Source.Height;
Rectanglerect = newRectangle(0, 0, iWidth, iHeight);
System.Drawing.Imaging.BitmapDatabmpData = Source.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite, Source.PixelFormat); IntPtriPtr = bmpData.Scan0;
intiBytes = iWidth * iHeight * 3; //根据通道数进行设置 byte[] PixelValues = newbyte[iBytes];
//int time = Environment.TickCount;
System.Runtime.InteropServices.Marshal.Copy(iPtr, PixelValues, 0, iBytes); //time = Environment.TickCount - time; //Console.WriteLine(time.ToString() + \ Source.UnlockBits(bmpData); step = bmpData.Stride; result = PixelValues; // return result; // step = 0;
BitmapInfo bi = newBitmapInfo{ Result=result, Step=step }; return bi; } }
///
publicclassBitmapInfo {
publicbyte[] Result { get; set; } publicint Step { get; set; }
}
Step是扫描的步长，这个很重要，如果这个步长不是原来的值，就会造成图像偏移，从而造成失真。
C++部分
DLL_APIvoid_stdcallshow(uchar* data,intwidth,intheight,intstep) {
Matimage(height,width, CV_8UC3,data,step); //image.data = data; imshow(\,image);
//Mat(int rows, int cols, int type, void* data, size_t step = AUTO_STEP); }
C# 中调用方式
BitmapInfo bi = GetImagePixel(bitmap);
show(bi.Result,bitmap.Width,bitmap.Height,bi.Step);
至此完成他们的相互转换