我尝试使用 pip install opencv 安装 OpenCV，但出现以下错误：
ERROR: Could not find a version that satisfies the requirement opencv
ERROR: No matching distribution found for opencv
WARNING: You are using pip version 21.0.1; however, version 21.1.1 is available.
You should consider upgrading via the 'c:\users\ozark\appdata\local\programs\python\python38-
32\python.exe -m pip install --upgrade pip' command.
然后我尝试使用 pip install cv2，但再次出现错误：
ERROR: Could not find a version that satisfies the requirement cv2
ERROR: No matching distribution found for cv2
WARNING: You are using pip version 21.0.1; however, …