如何在c#中使用opencv函数库

// opencvImage.cpp : Defines the exported functions for the DLL application.
//
 
#include "stdafx.h"
#include <opencv2/core/core.hpp>
#include "opencv2/photo.hpp"
 
#ifdef _DEBUG
#pragma comment(lib,"opencv_core331d.lib")
#pragma comment(lib,"opencv_imgproc331d.lib")
#pragma comment(lib,"opencv_photo331d.lib")
#else
#pragma comment(lib,"opencv_core331.lib")
#pragma comment(lib,"opencv_imgproc331.lib")
#pragma comment(lib,"opencv_photo331.lib")
#endif
 
#define Export_api extern "C" _declspec(dllexport)
 
using namespace cv;
 
Export_API void _stdcall Blend(unsigned char * src, int width, int height, int stride,
							 int bitcount, unsigned char *dst, int alpha)
{
	double beta,alpha1 = alpha / 255.0 ;
	Mat src1(width, height, CV_8UC3, src, stride);
	Mat src2(width, height, CV_8UC3, dst, stride);
	Mat dst1(width, height, CV_8UC3, dst, stride);
 
	beta = (1.0 - alpha1);
 
	addWeighted(src1, alpha1, src2, beta, 0.0, dst1);
}
 
Export_API void _stdcall PoissonBlend(unsigned char * src, int width, int height, int stride,
									 int bitcount, unsigned char *dst, int flags)
{
	int cx = width >> 1;
	int cy = height >> 1;
	int numpts = 5;
	Point point(cx, cy);
	Point pts[] = { { 80, 40 }, { 30, height - 80 }, { cx, height - 20 }, { width - 30, height - 80 }, { width - 80, 40 } };
	Mat img0(width, height, CV_8UC3, src, stride);
	Mat dst0(width, height, CV_8UC3, dst, stride);
	Mat final = Mat::zeros(img0.size(), CV_8UC3);
	Mat mask = Mat::zeros(img0.size(), CV_8UC1);
	const Point* pts4[1] = { &pts[0] };
	fillPoly(mask, pts4, &numpts, 1, Scalar(255, 255, 255), 8, 0);
//	circle(mask, point, cx - 30, Scalar(255, 255, 255),-1);
	bitwise_and(img0, img0, final, mask);
	seamlessClone(img0, dst0, mask, point, dst0, flags);
}

LIBRARY "opencvImage"
 
EXPORTS
 
Blend @1
 
PoissonBlend @2

using System.Runtime.InteropServices;

[DllImport("opencvImage.dll")]
unsafe public static extern void Blend(byte* src, int width, int height, int stride, int bitcount, byte* dst, int alpha);

Bitmap bp = new Bitmap(srcImage);
 
System.Drawing.Rectangle rect = new System.Drawing.Rectangle(x, y, width, height);
 
BitmapData src = bp.LockBits(rect, ImageLockMode.ReadWrite,PixelFORMat.Format24bppRgb);
Bitmap dp = new Bitmap(destImage);
System.Drawing.Rectangle dstRect = new System.Drawing.Rectangle(dx, dy, width, height);
BitmapData dst = dp.LockBits(dstRect, ImageLockMode.ReadWrite,PixelFormat.Format24bppRgb);
 
int nPitch = src.Stride;
int bitCount = 3;
byte* lpsrc = (byte*)src.Scan0;
byte* lpdst = (byte*)dst.Scan0;
byte alpha = 128;
Blend(lpsrc, width, height, nPitch, bitCount ,lpdst, alpha);
bp.UnlockBits(src);
dp.UnlockBits(dst);
return dp;

Export_API void _stdcall Blend(unsigned char * src, int width, int height, int stride,
							 int bitcount, unsigned char *dst, int alpha)
{
	double beta,alpha1 = alpha / 255.0 ;
	Mat src1(width, height, CV_8UC3, src, stride);
	Mat src2(width, height, CV_8UC3, dst, stride);
	Mat dst1(width, height, CV_8UC3, dst, stride);
 
	beta = (1.0 - alpha1);
 
	addWeighted(src1, alpha1, src2, beta, 0.0, dst1);
}