1 // 画出直方图分布 2 void saveHistogram(CvHistogram* hist) 3 { 4 if(!hist) return; 5 if(hist->mat.dim->size<=0) return; 6 int scale = 2; 7 int hist_height = 300; 8 IplImage* hist_image = cvCreateImage(cvSize(hist->mat.dim->size*scale,hist_height),8,3); 9 cvZero(hist_image); 10 11 float max_value = 0; 12 cvGetMinMaxHistValue(hist, 0,&max_value,0,0); 13 for(int i=0;i<hist->mat.dim->size;i++) 14 { 15 float bin_val = cvQueryHistValue_1D(hist,i); 16 int intensity = cvRound(bin_val*(hist_height-50)/max_value); 17 // cvRectangle cvLine 18 cvRectangle( 19 hist_image, 20 cvPoint(i*scale,hist_height-1), 21 cvPoint((i+1)*scale - 1, hist_height - intensity), 22 CV_RGB(255,255,255)); 23 } 24 cvNamedWindow("hist_image"); 25 cvShowImage("hist_image",hist_image); 26 cvWaitKey(0); 27 } 28 29 30 // 直方图获取与显示 31 CvHistogram* Histogram_Image(IplImage *image) 32 { 33 int hist_size=256; 34 float range[]={0,255}; 35 float * ranges[]={range}; 36 IplImage * gray_plane = cvCreateImage(cvGetSize(image),8,1); 37 cvCvtColor(image,gray_plane,CV_BGR2GRAY); 38 CvHistogram* gray_hist = cvCreateHist(1,&hist_size,CV_HIST_ARRAY,ranges,1); 39 cvCalcHist(&gray_plane,gray_hist,0,0); 40 return gray_hist; 41 }
2021-06-04
