[学习OpenCV攻略][008][Canny边缘检测]

cvGetSize(输入图片)

得到输入图片的大小

cvCanny(输入图片,输出图片,lowThresh,highThresh,aperture)

把输入图片按设定光圈值进行Canny边缘检测，然后输出到输出图片中

#include "cv.h"
#include "highgui.h"
 
IplImage *doCanny(IplImage *in, double lowThresh, double highThresh, double aperture){
    if(in->nChannels != 1){
        return NULL;
    }
     
    IplImage *out = cvCreateImage(cvGetSize(in), in->depth, 1);
    cvCanny(in, out, lowThresh, highThresh, aperture);
     
    return out;
}
 
int main(int argc, char **argv){
    IplImage *img_rgb = cvLoadImage(argv[1]);
    IplImage *img_gry = cvCreateImage(cvSize(img_rgb->width, img_rgb->height), img_rgb->depth, 1);
     
    cvCvtColor(img_rgb, img_gry, CV_BGR2GRAY);
     
    cvNamedWindow("gray", CV_WINDOW_AUTOSIZE);
    cvNamedWindow("canny", CV_WINDOW_AUTOSIZE);
     
    cvShowImage("gray", img_gry);
     
    IplImage *img_cny = doCanny(img_gry, 10, 100, 3);
    cvShowImage("canny", img_cny);
     
    cvWaitKey(0);
     
    cvReleaseImage(&img_cny);
    cvReleaseImage(&img_gry);
    cvReleaseImage(&img_rgb);
     
    cvDestroyWindow("canny");
    cvDestroyWindow("gray");
     
    return 0;
}