OpenCV从入门到放弃系列之——图像的基本操作

读取、修改、保存图像

• 图像读取函数imread();
• 图像颜色空间的转换cvtColor();
• 图像保存至硬盘imwrite();

/*************************************************
 *  Author: zhonghuasong
 *  Email: [e-mail]
 *  Create Time: 2016-12-03 15:03:00
 ************************************************/

#include <iostream>
#include <opencv/cv.h>
#include <opencv2/highgui.hpp>

using namespace cv;
using namespace std;

int main(int argc, char** argv) {
    if (argc != 2) {
        cout << "Usage: " << argv[0] << " <imagefile>" << endl;
    }

    char* imageName = argv[1];

    Mat image;
    image = imread(argv[1], CV_LOAD_IMAGE_COLOR);

    if (!image.data) {
        cout << "No image data" << endl;
        return -1;
    }

    Mat gray_image;
    cvtColor(image, gray_image, CV_BGR2GRAY);

    imwrite("./Gray_Image.jpg", gray_image);

    namedWindow(imageName, CV_WINDOW_AUTOSIZE);
    namedWindow("Gray image", CV_WINDOW_AUTOSIZE);

    imshow(imageName, image);
    imshow("Gray image", gray_image);

    waitKey(0);

    return 0;
}