OpenCV 实践程序14——图片中人脸检测
2014-09-01 19:39
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#include "cv.h" #include "highgui.h" #include <stdio.h> #include <stdlib.h> #include <string.h> #include <assert.h> #include <math.h> #include <float.h> #include <limits.h> #include <time.h> #include <ctype.h> #ifdef _EiC #define WIN32 #endif static CvMemStorage* storage = 0; static CvHaarClassifierCascade* cascade = 0; void detect_and_draw( IplImage* image ); const char* cascade_name = "haarcascade_frontalface_alt.xml"; /* "haarcascade_profileface.xml";*/ int main( int argc, char** argv ) { cascade_name = "haarcascade_fullbody.xml"; //haarcascade_fullbody, haarcascade_frontalface_alt2 cascade = (CvHaarClassifierCascade*)cvLoad( cascade_name, 0, 0, 0 ); if( !cascade ) { fprintf( stderr, "ERROR: Could not load classifier cascade\n" ); return -1; } storage = cvCreateMemStorage(0); cvNamedWindow( "result", 1 ); const char* filename = "Lena.jpg"; IplImage* image = cvLoadImage( filename, 1 ); if( image ) { detect_and_draw( image ); cvWaitKey(0); cvReleaseImage( &image ); } cvDestroyWindow("result"); return 0; } void detect_and_draw(IplImage* img ) { double scale=1.2; static CvScalar colors[] = { {{0,0,255}},{{0,128,255}},{{0,255,255}},{{0,255,0}}, {{255,128,0}},{{255,255,0}},{{255,0,0}},{{255,0,255}} };//Just some pretty colors to draw with //Image Preparation // IplImage* gray = cvCreateImage(cvSize(img->width,img->height),8,1); IplImage* small_img=cvCreateImage(cvSize(cvRound(img->width/scale),cvRound(img->height/scale)),8,1); cvCvtColor(img,gray, CV_BGR2GRAY); cvResize(gray, small_img, CV_INTER_LINEAR); cvEqualizeHist(small_img,small_img); //直方图均衡 //Detect objects if any // cvClearMemStorage(storage); double t = (double)cvGetTickCount(); CvSeq* objects = cvHaarDetectObjects(small_img, cascade, storage, 1.1, 2, 0/*CV_HAAR_DO_CANNY_PRUNING*/, cvSize(30,30)); t = (double)cvGetTickCount() - t; printf( "detection time = %gms\n", t/((double)cvGetTickFrequency()*1000.) ); //Loop through found objects and draw boxes around them for(int i=0;i<(objects? objects->total:0);++i) { CvRect* r=(CvRect*)cvGetSeqElem(objects,i); cvRectangle(img, cvPoint(r->x*scale,r->y*scale), cvPoint((r->x+r->width)*scale,(r->y+r->height)*scale), colors[i%8]); } for( int i = 0; i < (objects? objects->total : 0); i++ ) { CvRect* r = (CvRect*)cvGetSeqElem( objects, i ); CvPoint center; int radius; center.x = cvRound((r->x + r->width*0.5)*scale); center.y = cvRound((r->y + r->height*0.5)*scale); radius = cvRound((r->width + r->height)*0.25*scale); cvCircle( img, center, radius, colors[i%8], 3, 8, 0 ); } cvShowImage( "result", img ); cvReleaseImage(&gray); cvReleaseImage(&small_img); }
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