basic

basic/readpixel.cpp

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+// 读取像素
+#include<opencv2/opencv.hpp>
+#include<iostream>
+
+using namespace std;
+using namespace cv;
+
+int main()
+{
+    string image_path = "../img/1.png";
+    Mat image = imread(image_path);
+
+    if (image.empty()) {
+        cout << "错误：无法加载图像，请检查路径是否正确。" << endl;
+        return -1;
+    }
+
+    Vec3b pixel_value = image.at<Vec3b>(100, 150);
+
+    cout << "B: " << (int)pixel_value[0] << " "
+         << "G: " << (int)pixel_value[1] << " "
+         << "R: " << (int)pixel_value[2] << endl;
+
+}

basic/roi.cpp

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+// 修改像素
+#include<opencv2/opencv.hpp>
+#include<iostream>
+
+using namespace std;
+using namespace cv;
+
+int main()
+{
+    string image_path = "../img/1.png";
+    Mat image = imread(image_path);
+    Mat result = image.clone();
+
+    if (image.empty()) {
+        cout << "错误：无法加载图像，请检查路径是否正确。" << endl;
+        return -1;
+    }
+
+    Rect roi_rect(0, 0, 100, 100);
+    Mat roi = result(roi_rect);
+    roi.setTo(Scalar(0, 255, 0));
+    imshow("Original (Unchanged)", image);
+    imshow("Modified Copy", result);
+    waitKey(0);
+
+    return 0;
+
+}