如何读取像素范围c++

#include <opencv2/opencv.hpp>

int main() {
    // 读取图像
    cv::Mat image = cv::imread("image.jpg");

    // 检查图像是否成功读取
    if (image.empty()) {
        std::cout << "无法读取图像" << std::endl;
        return -1;
    }

    // 定义像素范围
    int startX = 100;
    int startY = 100;
    int endX = 200;
    int endY = 200;

    // 遍历像素范围
    for (int y = startY; y < endY; y++) {
        for (int x = startX; x < endX; x++) {
            // 获取像素值
            cv::Vec3b pixel = image.at<cv::Vec3b>(y, x);

            // 分别获取像素的B、G、R通道值
            uchar blue = pixel[0];
            uchar green = pixel[1];
            uchar red = pixel[2];

            // 在控制台输出像素值
            std::cout << "像素(" << x << ", " << y << "): ";
            std::cout << "B=" << static_cast<int>(blue) << ", ";
            std::cout << "G=" << static_cast<int>(green) << ", ";
            std::cout << "R=" << static_cast<int>(red) << std::endl;
        }
    }

    return 0;
}