update the start

.gitignore

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

start/display.cpp

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+#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;
+}