C++和OpenCV读取一张灰度图像、输出图像的通道、长、宽、像素遍历以及保存以及读取一张彩色图像输出图像的通道、长、宽、像素遍历并保存代码

读取一张灰度图像、输出图像的通道、长、宽、像素遍历以及保存：

#include <iostream>
#include <opencv2/opencv.hpp>

int main()
{
    // 读取灰度图像
    cv::Mat grayImage = cv::imread("grayImage.png", cv::IMREAD_GRAYSCALE);

    // 输出图像通道数、长、宽
    std::cout << "Channels: " << grayImage.channels() << std::endl;
    std::cout << "Width: " << grayImage.cols << std::endl;
    std::cout << "Height: " << grayImage.rows << std::endl;

    // 遍历像素并输出
    for (int y = 0; y < grayImage.rows; ++y)
    {
        for (int x = 0; x < grayImage.cols; ++x)
        {
            std::cout << static_cast<int>(grayImage.at<uchar>(y, x)) << " ";
        }
        std::cout << std::endl;
    }

    // 保存图像
    cv::imwrite("grayImage_output.png", grayImage);

    return 0;
}

读取一张彩色图像、输出图像的通道、长、宽、像素遍历并保存：

#include <iostream>
#include <opencv2/opencv.hpp>

int main()
{
    // 读取彩色图像
    cv::Mat colorImage = cv::imread("colorImage.png");

    // 输出图像通道数、长、宽
    std::cout << "Channels: " << colorImage.channels() << std::endl;
    std::cout << "Width: " << colorImage.cols << std::endl;
    std::cout << "Height: " << colorImage.rows << std::endl;

    // 遍历像素并输出
    for (int y = 0; y < colorImage.rows; ++y)
    {
        for (int x = 0; x < colorImage.cols; ++x)
        {
            std::cout << static_cast<int>(colorImage.at<cv::Vec3b>(y, x)[0]) << " ";
            std::cout << static_cast<int>(colorImage.at<cv::Vec3b>(y, x)[1]) << " ";
            std::cout << static_cast<int>(colorImage.at<cv::Vec3b>(y, x)[2]) << " ";
        }
        std::cout << std::endl;
    }

    // 保存图像
    cv::imwrite("colorImage_output.png", colorImage);

    return 0;
}
``