RGB转HSI C代码（转载）
// HSI.cpp : RGB TO HSI并显示出来 // #include <stdio.h> #include <math.h> #include <cv.h> #include <highgui.h> #include <cxcore.h> #include <cvaux.h> int min(int a, int b, int c); int main(int argc, char ** argv) { IplImage * Img = cvLoadImage(argv[1], 1); IplImage * HImg = cvCreateImage(cvGetSize(Img), IPL_DEPTH_8U, 1); IplImage * SImg = cvCreateImage(cvGetSize(Img), IPL_DEPTH_8U, 1); IplImage * IImg = cvCreateImage(cvGetSize(Img), IPL_DEPTH_8U, 1); if( Rgb2Hsi(Img, HImg, SImg, IImg) == 0) { printf("Convert Error!/n"); exit(-1); } //高斯滤波先，以平滑图像 cvSmooth(SImg, SImg, CV_GAUSSIAN, 3, 0, 0, 0); // cvThreshold(SImg, SImg, 100, 255, CV_THRESH_BINARY); IplImage *pImgCanny = cvCreateImage(cvGetSize(SImg), IPL_DEPTH_8U, 1); cvCanny(SImg, pImgCanny, 50, 150, 3); cvNamedWindow("Img", 1); cvNamedWindow("HImg", 1); cvNamedWindow("SImg", 1); cvNamedWindow("IImg", 1); cvShowImage("Img", Img); cvShowImage("HImg", HImg); cvShowImage("SImg", SImg); cvShowImage("IImg", IImg); cvWaitKey(0); return 0; } int Rgb2Hsi(const IplImage* src, IplImage* dataH, IplImage* dataS, IplImage* dataI) { //返回0：成功，1：失败 //输入为彩色图像src, 输出dataH,dataS,dataI,分别为HSI模型的H、S、I分量 int y,x,offsetSrc,offsetHsi; int step,channels,step1; int r,g,b,minRgb; double cosThita,num,den,S,H; uchar *dataImg; uchar *dataS1; uchar *dataI1; uchar *dataH1; channels = src->nChannels; dataImg = (uchar *)src->imageData; dataI1 = (uchar *)dataI->imageData; dataH1=(uchar *)dataH->imageData; dataS1=(uchar *)dataS->imageData; if (channels!=3) { printf("The input image is not 3-channels!/n"); return 0; } step=src->widthStep; step1=dataI->widthStep; for (y=0; y<src->height; y++) for (x=0; x<src->width; x++) { offsetSrc = y*step + x*channels; offsetHsi=y*step1+x; b = dataImg[offsetSrc]; g=dataImg[offsetSrc+1]; r=dataImg[offsetSrc+2]; dataI1[offsetHsi] = (int)((r+g+b)/3+0.5); num=(2*r-g-b)/2; den=sqrt((r-g)*(r-g)+(r-b)*(g-b)); if (den==0) den=0.01; cosThita=acos(num/den); minRgb = min(r, g, b); den=r+g+b; if (den==0) den=0.01; S=1-3*minRgb/den; dataS1[offsetHsi]=(int) (S*255+0.5);//将S分量和H分量都扩充到[0,255]区间以便于显示 //一般H分量在[0,2pi]之间，S在[0,1]之间 if (b<=g) H=cosThita/(2*3.14); else H=(2*3.14-cosThita)/(2*3.14); dataH1[offsetHsi] = (int)(H*255+0.5); if (S==0) dataH1[offsetHsi]=0; } return 1; } int min(int a, int b, int c) { int m = a; if(m > b) m = b; if( m > c) m = c; return m; }
原作者：大家叫我克路好了