Opencv SkinOtsu皮肤检测

void SkinRGB(IplImage* rgb, IplImage* _dst)
{
    assert(rgb->nChannels == 3 && _dst->nChannels == 3);

    static const int R = 2;
    static const int G = 1;
    static const int B = 0;

    IplImage* dst = cvCreateImage(cvGetSize(_dst), 8, 3);
    cvZero(dst);

    for (int h = 0; h<rgb->height; h++)
    {
        unsigned char* prgb = (unsigned char*)rgb->imageData + h*rgb->widthStep;
        unsigned char* pdst = (unsigned char*)dst->imageData + h*dst->widthStep;
        for (int w = 0; w<rgb->width; w++)
        {
            if ((prgb[R]>95 && prgb[G]>40 && prgb[B]>20 &&
                prgb[R] - prgb[B]>15 && prgb[R] - prgb[G]>15) ||//uniform illumination
                (prgb[R]>200 && prgb[G]>210 && prgb[B]>170 &&
                abs(prgb[R] - prgb[B]) <= 15 && prgb[R]>prgb[B] && prgb[G]>prgb[B])//lateral illumination
                )
            {
                memcpy(pdst, prgb, 3);
            }
            prgb += 3;
            pdst += 3;
        }
    }
    cvCopy(dst, _dst);
    cvReleaseImage(&dst);
}
// skin detection in rg space
void cvSkinRG(IplImage* rgb, IplImage* gray)
{
    assert(rgb->nChannels == 3 && gray->nChannels == 1);

    const int R = 2;
    const int G = 1;
    const int B = 0;

    double Aup = -1.8423;
    double Bup = 1.5294;
    double Cup = 0.0422;
    double Adown = -0.7279;
    double Bdown = 0.6066;
    double Cdown = 0.1766;
    for (int h = 0; h<rgb->height; h++)
    {
        unsigned char* pGray = (unsigned char*)gray->imageData + h*gray->widthStep;
        unsigned char* pRGB = (unsigned char*)rgb->imageData + h*rgb->widthStep;
        for (int w = 0; w<rgb->width; w++)
        {
            int s = pRGB[R] + pRGB[G] + pRGB[B];
            double r = (double)pRGB[R] / s;
            double g = (double)pRGB[G] / s;
            double Gup = Aup*r*r + Bup*r + Cup;
            double Gdown = Adown*r*r + Bdown*r + Cdown;
            double Wr = (r - 0.33)*(r - 0.33) + (g - 0.33)*(g - 0.33);
            if (g<Gup && g>Gdown && Wr>0.004)
            {
                *pGray = 255;
            }
            else
            {
                *pGray = 0;
            }
            pGray++;
            pRGB += 3;
        }
    }

}
// implementation of otsu algorithm
// author: onezeros#yahoo.cn
// reference: Rafael C. Gonzalez. Digital Image Processing Using MATLAB
void cvThresholdOtsu(IplImage* src, IplImage* dst)
{
    int height = src->height;
    int width = src->width;

    //histogram
    float histogram[256] = { 0 };
    for (int i = 0; i<height; i++)
    {
        unsigned char* p = (unsigned char*)src->imageData + src->widthStep*i;
        for (int j = 0; j<width; j++)
        {
            histogram[*p++]++;
        }
    }
    //normalize histogram
    int size = height*width;
    for (int i = 0; i<256; i++)
    {
        histogram[i] = histogram[i] / size;
    }

    //average pixel value
    float avgValue = 0;
    for (int i = 0; i<256; i++)
    {
        avgValue += i*histogram[i];
    }

    int threshold;
    float maxVariance = 0;
    float w = 0, u = 0;
    for (int i = 0; i<256; i++)
    {
        w += histogram[i];
        u += i*histogram[i];

        float t = avgValue*w - u;
        float variance = t*t / (w*(1 - w));
        if (variance>maxVariance)
        {
            maxVariance = variance;
            threshold = i;
        }
    }

    cvThreshold(src, dst, threshold, 255, CV_THRESH_BINARY);
}

void cvSkinOtsu(IplImage* src, IplImage* dst)
{
    assert(dst->nChannels == 1 && src->nChannels == 3);

    IplImage* ycrcb = cvCreateImage(cvGetSize(src), 8, 3);
    IplImage* cr = cvCreateImage(cvGetSize(src), 8, 1);
    cvCvtColor(src, ycrcb, CV_BGR2YCrCb);
    cvSplit(ycrcb, 0, cr, 0, 0);

    cvThresholdOtsu(cr, cr);
    cvCopy(cr, dst);
    cvReleaseImage(&cr);
    cvReleaseImage(&ycrcb);
}

void cvSkinYUV(IplImage* src, IplImage* dst)
{
    IplImage* ycrcb = cvCreateImage(cvGetSize(src), 8, 3);
    //IplImage* cr=cvCreateImage(cvGetSize(src),8,1);
    //IplImage* cb=cvCreateImage(cvGetSize(src),8,1);
    cvCvtColor(src, ycrcb, CV_BGR2YCrCb);
    //cvSplit(ycrcb,0,cr,cb,0);

    static const int Cb = 2;
    static const int Cr = 1;
    static const int Y = 0;

    //IplImage* dst=cvCreateImage(cvGetSize(_dst),8,3);
    cvZero(dst);

    for (int h = 0; h<src->height; h++)
    {
        unsigned char* pycrcb = (unsigned char*)ycrcb->imageData + h*ycrcb->widthStep;
        unsigned char* psrc = (unsigned char*)src->imageData + h*src->widthStep;
        unsigned char* pdst = (unsigned char*)dst->imageData + h*dst->widthStep;
        for (int w = 0; w<src->width; w++)
        {
            if (pycrcb[Cr] >= 133 && pycrcb[Cr] <= 173 && pycrcb[Cb] >= 77 && pycrcb[Cb] <= 127)
            {
                memcpy(pdst, psrc, 3);
            }
            pycrcb += 3;
            psrc += 3;
            pdst += 3;
        }
    }
    //cvCopyImage(dst,_dst);
    //cvReleaseImage(&dst);
}

void cvSkinHSV(IplImage* src, IplImage* dst)
{
    IplImage* hsv = cvCreateImage(cvGetSize(src), 8, 3);
    //IplImage* cr=cvCreateImage(cvGetSize(src),8,1);
    //IplImage* cb=cvCreateImage(cvGetSize(src),8,1);
    cvCvtColor(src, hsv, CV_BGR2HSV);
    //cvSplit(ycrcb,0,cr,cb,0);

    static const int V = 2;
    static const int S = 1;
    static const int H = 0;

    //IplImage* dst=cvCreateImage(cvGetSize(_dst),8,3);
    cvZero(dst);

    for (int h = 0; h<src->height; h++)
    {
        unsigned char* phsv = (unsigned char*)hsv->imageData + h*hsv->widthStep;
        unsigned char* psrc = (unsigned char*)src->imageData + h*src->widthStep;
        unsigned char* pdst = (unsigned char*)dst->imageData + h*dst->widthStep;
        for (int w = 0; w<src->width; w++)
        {
            if (phsv[H] >= 7 && phsv[H] <= 29)
            {
                memcpy(pdst, psrc, 3);
            }
            phsv += 3;
            psrc += 3;
            pdst += 3;
        }
    }
    //cvCopyImage(dst,_dst);
    //cvReleaseImage(&dst);
}

int main()
{

    //IplImage* img = cvLoadImage("C:\C_C++ code\Photo and video\text009.jpg"); //随便放一张jpg图片在D盘或另行设置目录
    //IplImage* dstRGB = cvCreateImage(cvGetSize(img), 8, 3);
    //IplImage* dstRG = cvCreateImage(cvGetSize(img), 8, 1);
    
    //IplImage* dst_YUV = cvCreateImage(cvGetSize(img), 8, 3);
    //IplImage* dst_HSV = cvCreateImage(cvGetSize(img), 8, 3);


    

    
    cvNamedWindow("inputimage", CV_WINDOW_AUTOSIZE);
    cvShowImage("inputimage", img);
    cvWaitKey(0);
    SkinRGB(img, dstRGB);
    cvNamedWindow("SkinRGB", CV_WINDOW_AUTOSIZE);
    cvShowImage("SkinRGB", dstRGB);
    cvWaitKey(0);
    cvSkinRG(img, dstRG);
    cvNamedWindow("cvSkinRG", CV_WINDOW_AUTOSIZE);
    cvShowImage("cvSkinRG", dstRG);
    cvWaitKey(0);
    cvSkinOtsu(img, dst_crotsu);
    cvNamedWindow("cvSkinOtsu", CV_WINDOW_AUTOSIZE);
    cvShowImage("cvSkinOtsu", dst_crotsu);
    cvWaitKey(0);
    cvSkinYUV(img, dst_YUV);
    cvNamedWindow("cvSkinYUV", CV_WINDOW_AUTOSIZE);
    cvShowImage("cvSkinYUV", dst_YUV);
    cvWaitKey(0);
    cvSkinHSV(img, dst_HSV);
    cvNamedWindow("cvSkinHSV", CV_WINDOW_AUTOSIZE);
    cvShowImage("cvSkinHSV", dst_HSV);
    cvWaitKey(0);
    
    
    
    IplImage *src;
    //VideoCapture video("C:\C_C++ EX8 code\Video\MyVideo.wmv");
    VideoCapture video(0);
    if (!video.isOpened())
    {
        return -1;
    }
    cv::Mat img, dstimg;
    cv::Rect rect(170, 40, 240, 400);
    video >> img;
    src = &(IplImage(img));
    IplImage* dst_crotsu = cvCreateImage(cvGetSize(src), 8, 1);
    while (1)
    {
        video >> img;
        src = &(IplImage(img));
        cvSkinOtsu(src, dst_crotsu);
        cvNamedWindow("cvSkinOtsu", CV_WINDOW_AUTOSIZE);

        Mat output = cvarrToMat(dst_crotsu);
        cv::erode(output, output, cv::Mat());
        cv::erode(output, output, cv::Mat());
        cv::erode(output, output, cv::Mat());
        cv::erode(output, output, cv::Mat());
        cv::dilate(output, output, cv::Mat());

        imshow("cvSkinOtsu", output);

        if (cv::waitKey(40) > 0)
        {
            break;
        }
    }

    
    cvWaitKey(0);
    return 0;
}