添加重要文件

a.py

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+import cv2                                                                                                                                                                                                  
+import argparse
+import time
+
+
+def scan_available_cameras(max_ports=10):
+    """扫描系统中可用的摄像头端口"""
+    available_ports = [] 
+    
+    for i in range(max_ports):
+        cap = cv2.VideoCapture(i)
+        if not cap.isOpened():
+            cap.release()
+            continue
+            
+        # 尝试读取一帧以确认摄像头是否真的可用
+        ret, frame = cap.read() 
+        if ret:
+            available_ports.append(i)
+            
+        cap.release()
+        
+    return available_ports
+    
+
+def get_camera_info(camera_index):
+    """获取摄像头的详细信息，包括分辨率和设备名称"""
+    cap = cv2.VideoCapture(camera_index) 
+    cap.set(cv2.CAP_PROP_FRAME_WIDTH,1920)
+    cap.set(cv2.CAP_PROP_FRAME_HEIGHT,1080)
+    if not cap.isOpened():
+        return {"status": "error", "message": f"无法打开摄像头 {camera_index}"}
+
+    try:
+        # 获取基本信息
+        width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
+        height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
+        fps = cap.get(cv2.CAP_PROP_FPS)
+
+        # 尝试获取设备名称（依赖于操作系统和驱动）
+        device_name = f"摄像头 {camera_index}"
+        try:
+            # Linux系统可能通过V4L2获取设备名称
+            import subprocess
+            result = subprocess.run(
+                f"v4l2-ctl -d /dev/video{camera_index} --all | grep 'Name'",
+                shell=True,
+                capture_output=True,
+                text=True
+            )
+            if result.stdout:
+                device_name = result.stdout.strip().split(':')[1].strip()
+        except:
+            pass
+
+        info = {
+            "status": "success",
+            "index": camera_index,
+            "device_name": device_name,
+            "resolution": f"{width}x{height}",
+            "fps": fps
+        }
+
+    except Exception as e:
+        info = {"status": "error", "message": str(e)}
+
+    while True:
+        # 读取一帧图像
+        ret, frame = cap.read()
+
+        # 检查是否成功读取图像
+        if not ret:
+            print("无法获取帧")
+            break
+
+        # 显示图像
+        cv2.imshow("", frame)
+        #cv2.imwrite("debug.png", frame)
+        # 等待按键事件，超时时间为1毫秒
+        key = cv2.waitKey(30)
+
+        # 按ESC键退出循环（ESC键的ASCII码为27）
+        if key == 27:
+            print("用户请求退出...")
+            break
+
+    cap.release()
+    return info
+
+
+def main():
+    parser = argparse.ArgumentParser(description='扫描并检测摄像头分辨率')
+    parser.add_argument('--scan', action='store_true', help='扫描所有可用摄像头')
+    parser.add_argument('--index', type=int, help='指定要检测的摄像头索引')
+    args = parser.parse_args()
+    if args.scan:
+        print("正在扫描系统中可用的摄像头端口...")
+        available_cameras = scan_available_cameras()
+
+        if not available_cameras:
+            print("未检测到可用的摄像头")
+            return
+       
+        print("\n可用摄像头列表:")
+        for i, cam_idx in enumerate(available_cameras):
+            info = get_camera_info(cam_idx)
+            if info["status"] == "success":
+                print(f"{i+1}. 端口: {cam_idx}, 设备: {info['device_name']}, 分辨率: {info['resolution']}")
+            else:
+                print(f"{i+1}. 端口: {cam_idx} (无法获取详细信息)")
+       
+        print("\n使用方法:")
+        print(f"python {__file__} --index <端口号>  # 检测指定摄像头的详细信息")
+   
+    elif args.index is not None:
+        print(f"正在检测摄像头 {args.index} 的详细信息...")
+        info = get_camera_info(args.index)
+       
+        if info["status"] == "success":
+            print("\n摄像头信息:")
+            print(f"  端口号: {info['index']}")
+            print(f"  设备名称: {info['device_name']}")
+            print(f"  分辨率: {info['resolution']}")
+            print(f"  帧率: {info['fps']:.2f} FPS")
+        else:
+            print(f"错误: {info['message']}")
+   
+    else:
+        parser.print_help()
+
+if __name__ == "__main__":
+    main()