opencv学习笔记（二）

摘要：学习资料主要参考于毛星云主编《opencv3编程入门》

1、图像显示

#include<opencv2/opencv.hpp>
using namespace cv; //使用命名空间
void main(){
  Mat srcImage = imread('1.jpg');//载入图像
  imshow('图像标题',srcImage);//显示图像
  waitKey(0);//等待按键按下
}

2、图像腐蚀

#include <opencv2/opencv.hpp>
#include <opencv2/highgui/highgui.hpp>
using namespace std;
using namespace cv;
int main()
{
	Mat srcImage = imread("E:\\4.JPG");
	imshow("原图--腐蚀操作", srcImage);
	Mat element = getStructuringElement(MORPH_RECT, Size(15, 15));
	Mat dsImage;
	erode(srcImage, dsImage, element);	//腐蚀函数
	imshow("效果图", dsImage);
	waitKey(0);
	return 0;
}

3、图像模糊

#include <opencv2/opencv.hpp>
#include <opencv2/highgui/highgui.hpp>
using namespace std;
using namespace cv;

int main()
{
	Mat srcImage = imread("E:\\4.JPG");
	imshow("原图--腐蚀操作", srcImage);

	Mat dsImage;
	blur(srcImage, dsImage, Size(7, 7)); //进行滤波操作
	imshow("效果图", dsImage);
	waitKey(0);
	return 0;
}

4、边缘检测

#include <opencv2/opencv.hpp>
#include <opencv2/highgui/highgui.hpp>
using namespace std;
using namespace cv;

int main()
{
	Mat srcImage = imread("E:\\4.JPG");
	imshow("原图--腐蚀操作", srcImage);
	Mat dsImage,grayImage,edge;
	//创建与原图同类型和大小的矩阵dst
	dsImage.create(srcImage.size(), srcImage.type());
	//将原图转化为灰度图像
	cvtColor(srcImage, grayImage, CV_BGR2GRAY);
	//使用3*3内核降噪
	blur(grayImage, edge, Size(3, 3));
	//运行canny算子
	Canny(edge,edge,3,9,3);
	imshow("效果图", edge);
	waitKey(0);
	return 0;
}

5、读取视频或调用摄像头

int main()
{
	//初始化
	VideoCapture capture("E://1.avi");
  	//调用摄像头
	//VideoCapture capture(0);
	//循环每一帧，相当一张图
	while (1) {
		Mat frame;
		capture >> frame;//存储每一帧
		imshow("视频", frame);
		waitKey(50);//50ms
	}
	return 0;
}

6、写视频文件

int main() {  

    IplImage *iplImg = cvLoadImage("/home/huanglei/wr.jpg", 1);
    IplImage *iplImgNew = cvCreateImage(cvSize(320,240),8,3) ;  //改变图片大小适应视频
    cvResize(iplImg,iplImgNew,CV_INTER_LINEAR) ;
    CvVideoWriter* video = cvCreateVideoWriter("/home/huanglei/tree1.avi",
            CV_FOURCC('P', 'I', 'M', '1'), 20,
            cvSize(iplImgNew->width, iplImgNew->height), 1);  

    /*
     * 逐帧读取视频，并保存到另外一个视频文件中
     */
    CvCapture *cap;
    cap = cvCreateFileCapture("/home/huanglei/tree.avi");
    IplImage *imgVideo ;
    int q ;
    while (imgVideo = cvQueryFrame(cap)) {
        q = cvWriteFrame(video, imgVideo);
    }  

    /*
     * 在新的视频文件的末尾插入图片
     */
    int i;
    for (int x = 0; x < 50; x++) {
        i = cvWriteFrame(video, iplImgNew);
    }  

    /*
     * 释放指针
     */
    if (video) {
        cvReleaseVideoWriter(&video);
        cvReleaseImage(&imgVideo);
        cvReleaseImage(&imgVideo);
        cvReleaseImage(&iplImg);
    }  

    return 0;
}