#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
using namespace cv;
int main(int argc, char** argv)
{namedWindow("例5——平滑前", 0);namedWindow("例5——平滑后", 0);VideoCapture cap;cap.open("E:/ 1.mp4");Mat frame;for (;;){cap >> frame;if (frame.empty()) break;Mat smoothImage;GaussianBlur(frame, smoothImage, cv::Size(9, 9), 3, 3);imshow("例5——平滑前", frame);imshow("例5——平滑后", smoothImage);if (waitKey(33) >= 0)break;}return 0;
}

#include <opencv2/opencv.hpp>
#include <iostream>using namespace cv;
using namespace std;int main(int argc, char** argv)
{Mat img1, img2;namedWindow("例6_1", 0);namedWindow("例6_2", 0);img1 = imread("E:/1.jpg",-1);imshow("例6_1", img1);pyrDown(img1, img2); imshow("例6_2", img2);int img1_width, img1_height, img2_width, img2_height;img1_width = img1.cols;img1_height = img1.rows;img2_width = img2.cols;img2_height = img2.rows;cout << "img1尺寸-------width=" << img1_width << "------height=" << img1_height << endl;cout << "img2尺寸-------width=" << img2_width << "------height=" << img2_height << endl;cv::waitKey(0);return 0;
}

#include <opencv2/opencv.hpp>
#include <iostream>using namespace cv;
using namespace std;int main(int argc, char** argv)
{Mat src, src_gray, cannyImg;namedWindow("例7_原图", 0);namedWindow("例7_灰度图", 0);namedWindow("例7_Canny图", 0);src = imread("E:/1.jpg", -1);cvtColor(src, src_gray, cv::COLOR_RGB2GRAY);Canny(src_gray, cannyImg, 30, 80);imshow("例7_原图", src);imshow("例7_灰度图", src_gray);imshow("例7_Canny图", cannyImg);cv::waitKey(0);return 0;
}

#include <opencv2/opencv.hpp>
#include <iostream>using namespace cv;
using namespace std;int main(int argc, char** argv)
{Mat src = imread("E:/1.jpg", 1);Mat modifyImg = Mat(src.size(), src.type());//新建一个与src大小、类型相同的空白图像namedWindow("例8_原图", 0);imshow("例8_原图", src);int height = src.rows;//图片的高度int width = src.cols;//图片的宽度for (int i = 0; i < height; i++){for (int j = 0; j < width; j++){modifyImg.at<Vec3b>(i, j)[0] = 255 - src.at<Vec3b>(i, j)[0];modifyImg.at<Vec3b>(i, j)[1] = 255 - src.at<Vec3b>(i, j)[1];modifyImg.at<Vec3b>(i, j)[2] = 255 - src.at<Vec3b>(i, j)[2];}}namedWindow("例8_修改图", 0);imshow("例8_修改图", modifyImg);waitKey(0);return 0;
}