Conert Code C++ to C# ? ( OPEN CV ===> EMGU CV)

#include <cv.h>
#include <highgui.h>
#include <iostream>
#include <cmath>

using namespace std;

#define blue  CV_RGB(0,0,255)
#define green CV_RGB(0,255,0)
#define red   CV_RGB(255,0,0)
#define white CV_RGB(255,255,255)
#define black CV_RGB(0,0,0)

void ClearScreen(IplImage* imgScribble, IplImage* imgDrawing)
{
    cvSet(imgScribble, black);
    cvSet(imgDrawing, white);
}

IplImage* GetThresholdedImage(IplImage* img, CvScalar& lowerBound, CvScalar& upperBound)
{
    // Convert the image into an HSV image
    IplImage* imgHSV = cvCreateImage(cvGetSize(img), 8, 3);
    cvCvtColor(img, imgHSV, CV_BGR2HSV);

    IplImage* imgThreshed = cvCreateImage(cvGetSize(img), 8, 1);

    cvInRangeS(imgHSV, lowerBound, upperBound, imgThreshed);

    cvReleaseImage(&imgHSV);
    return imgThreshed;
}