basic

.gitignore

@@ -0,0 +1 @@
+out

basic/readpixel.cpp

@@ -0,0 +1,24 @@
+// 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

@@ -0,0 +1,28 @@
+// 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;
+
+}

start/display.cpp

@@ -0,0 +1,34 @@
+#include <opencv2/opencv.hpp>
+#include <iostream>
+
+using namespace cv;
+using namespace std;
+
+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;
+    }
+
+    namedWindow("Display Image", WINDOW_AUTOSIZE);
+    imshow("Display Image", image);
+
+    int key = waitKey(0);
+
+    // 4. 根据用户按键执行操作
+    if (key == 's') {  // 如果按下 's' 键
+        // 保存图像
+        string output_path = "saved_image.jpg";
+        imwrite(output_path, image);
+        cout << "图像已保存为 " << output_path << endl;
+    } else {  // 如果按下其他键
+        cout << "图像未保存。" << endl;
+    }
+
+    destroyAllWindows();
+
+    return 0;
+}

start/read.cpp

@@ -7,7 +7,7 @@ using namespace std;
 using namespace cv;
 
 int main(){
-    Mat src = imread("/home/bi/下载/1.png");
+    Mat src = imread("../img/1.png");
     imshow("input",src);
     waitKey(0);
     destroyAllWindows();