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.gitignore

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+# Xmake cache
+.xmake/
+build/
+.vscode/
+
+# MacOS Cache
+.DS_Store
+
+

src/main.cpp

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+#include <opencv2/core.hpp>
+#include <opencv2/highgui.hpp>
+#include <iostream>
+
+int main(int argc, const char* argv[]){
+  cv::Mat img = cv::imread("armor.jpg", cv::IMREAD_COLOR);
+  
+  if (img.empty()) {
+    std::cerr << "Failed to load image!" << std::endl;
+    return -1;
+  }
+
+  int height = img.rows;  // 480
+  int width = img.cols;   // 720
+
+  int th = 128; // 亮度阈值
+
+  cv::Mat out = cv::Mat::zeros(height, width, CV_8UC1);
+
+  for (int j = 0; j < height; j++){
+    for (int i = 0; i < width; i++){
+      // 注意：OpenCV默认是BGR顺序
+      uchar val = (uchar)(
+        img.at<cv::Vec3b>(j,i)[0] * 0.0722 +  // B
+        img.at<cv::Vec3b>(j,i)[1] * 0.7152 +  // G
+        img.at<cv::Vec3b>(j,i)[2] * 0.2126    // R
+      );
+      
+      out.at<uchar>(j,i) = (val < th) ? 0 : 255;
+    }
+  }
+
+  cv::imshow("RESULT", out);
+  cv::waitKey(0);
+  cv::destroyAllWindows();
+
+  return 0;
+}

xmake.lua

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+add_rules("mode.debug", "mode.release")
+
+
+
+set_languages("c++11")
+set_optimize("faster")
+
+add_requires("cmake::OpenCV", {alias = "opencv", system = true})
+
+set_policy("generator.compile_commands", true)
+
+target("hello-cv")
+    set_kind("binary")
+    add_packages("opencv")
+    add_files("src/*.cpp")