用c++写一个opencv读取图像rgb值的代码

以下是使用OpenCV读取图像RGB值的示例代码：

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

using namespace cv;
using namespace std;

int main(int argc, char** argv)
{
    if (argc != 2)
    {
        cout << "Usage: ./read_rgb <image_path>" << endl;
        return -1;
    }

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

    if (image.empty())
    {
        cout << "Could not read the image: " << argv[1] << endl;
        return -1;
    }

    for (int row = 0; row < image.rows; row++)
    {
        for (int col = 0; col < image.cols; col++)
        {
            Vec3b pixel = image.at<Vec3b>(row, col);
            int blue = pixel[0];
            int green = pixel[1];
            int red = pixel[2];
            cout << "Pixel at (" << row << ", " << col << "): " << "R=" << red << ", G=" << green << ", B=" << blue << endl;
        }
    }

    return 0;
}

此代码将读取使用命令行参数传递的图像文件，并在控制台输出每个像素的RGB值。它使用了OpenCV的Mat类来表示图像，并使用了Mat类的at()函数来访问每个像素的RGB值。