说明：  用于简单的矩形检测，有文字说明，易懂，但不适合于背景复杂或检测目标倾斜的矩形检测，例如车牌等
(For the simple rectangular detection, there is a text description, easy to understand, but not suitable for testing in the context of the target complex or rectangular tilt testing, such as license plates, etc.)