用C++_OpenCV生成一幅灰度值为0~255的测试图像(测试矩阵)

用C++_OpenCV生成一幅灰度值为0~255的测试图像(测试矩阵)
代码如下：

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

using namespace cv;

int main()
{
    
    
	cv::Mat image1(26, 10, CV_8UC1);
	uchar value1 = 1;
	for (int i = 0; i < image1.rows; i++)
	{
    
    
		for (int j = 0; j < image1.cols; j++)
		{
    
    
			image1.at<uchar>(i, j) = value1;
			value1++;
		}
	}

	image1.at<uchar>(25, 6) = 0;
	image1.at<uchar>(25, 7) = 0;
	image1.at<uchar>(25, 8) = 0;
	image1.at<uchar>(25, 9) = 0;

	std::cout << image1 << std::endl;

	imwrite("0-255_level.bmp", image1);

	return(0);
}

测试代码如下：

生成的图片如下图所示：


上面这幅图片的百度网盘下载链接：
https://pan.baidu.com/s/1CUMBBuLcjWjF5icX_eXrzg?pwd=nqu2

用Python读入上面这幅图像后的数据情况如下：

import cv2 as cv
import sys

image = cv.imread('F:/material/images/2022/2022-06/0-255_level.bmp', 0)
if image is None:
    print('Error: Could not load image')
    sys.exit()