改变像素点的颜色

#include <opencv2/opencv.hpp>
#include <opencv2/core.hpp>
#include <filesystem>bool opencvTool::changeColor(const std::string image_p, int x_coor, int y_coor, const cv::Scalar color)
{std::filesystem::path file(image_p);if (!std::filesystem::exists(file)){std::cout << image_p << " is not exist" << std::endl;return false;}cv::Mat ima = cv::imread(image_p.c_str()); // 读取图像，替换为你的图片路径  cv::Scalar Red = cv::Scalar(0, 0, 255);  // Red color  if (x_coor> ima.cols || x_coor < 0){printf("Input x_coor: %d which exceeds width range of the image: %d \n", x_coor, ima.cols);return false;}if (y_coor > ima.rows || y_coor< 0){printf("Input y_coor: %d which exceeds height range of the image: %d \n", y_coor, ima.rows);return false;}// 改变像素点的颜色ima.at<cv::Vec3b>(y_coor, x_coor)[0] = 0;ima.at<cv::Vec3b>(y_coor, x_coor)[1] = 0;ima.at<cv::Vec3b>(y_coor, x_coor)[2] = 255;// 或者//uchar blue = 0;//uchar green = 0;//uchar red = 255;//ima.at<cv::Vec3b>(y_coor, x_coor) = cv::Vec3b(blue, green, red);cv::imwrite(image_p.c_str(), ima);return true;}bool opencvTool::changeColor(cv::Mat& image, int x_coor, int y_coor, const cv::Scalar color)
{if (image.empty()){std::cout << "Error: empty mat" << std::endl;return false;}if (x_coor > image.cols || x_coor < 0){printf("Input x_coor: %d which exceeds width range of the image: %d \n", x_coor, image.cols);return false;}if (y_coor > image.rows || y_coor < 0){printf("Input y_coor: %d which exceeds height range of the image: %d \n", y_coor, image.rows);return false;}// 更改指定坐标点的颜色image.at<cv::Vec3b>(y_coor, x_coor) = cv::Vec3b(color[0], color[1], color[2]);return true;
}