学习Opencv 第四章课后习题解答（Exercise 1a）

来源：互联网发布：java删除文件夹删不掉编辑：程序博客网时间：2024/05/21 18:50

题目内容:

a. Create a program that (1)reads frames from a video, (2) turns the result to grayscale,

and (3) performs Canny edge detection on the image.Display all three

stages of processing in three diff erent windows,with each window appropriately

named for its function.

程序：

#include "stdafx.h"#include "cv.h"#include "highgui.h"IplImage* Canny(IplImage* img ,double lowThread,double highThread,double aperture)//边缘检测，使用canny算子{if(img->nChannels!=1){return NULL;}IplImage* out =cvCreateImage(cvGetSize(img),img->depth,1);cvCanny(img,out,lowThread,highThread,aperture);return (out);}IplImage* colorchange(IplImage* in)//单通道灰度图像转变{IplImage* out = cvCreateImage(cvGetSize(in),in->depth,1);cvCvtColor(in,out,CV_RGB2GRAY);return (out);}int main(int argc,char** argv){CvCapture* capture = NULL;IplImage* frame=NULL;IplImage* gray=NULL;IplImage* canny=NULL;cvNamedWindow("Primary",CV_WINDOW_AUTOSIZE);cvNamedWindow("Gray",CV_WINDOW_AUTOSIZE);cvNamedWindow("Canny",CV_WINDOW_AUTOSIZE);capture = cvCreateFileCapture("d:\\opencv\\test1.avi");while (1){frame=cvQueryFrame(capture);if (!frame){break;}cvShowImage("Primary",frame);gray=colorchange(frame);cvShowImage("Gray",gray);canny = Canny(gray,120,160,3);cvShowImage("Canny",canny);    if (cvWaitKey(33)==27)    {break;    }}    #if 1   /*测试*/cvSaveImage("d:\\opencv\\experiment\\frame.jpg",frame);cvSaveImage("d:\\opencv\\experiment\\gray.jpg",gray);cvSaveImage("d:\\opencv\\experiment\\canny.jpg",canny);    #endifcvReleaseCapture(&capture);cvDestroyWindow("Primary");cvDestroyWindow("Gray");cvDestroyWindow("Canny"); return 0;}

实验结果：