Using the edge area as focusing window and linear forecasting method, the system can acquire clear image of upper object with little interfererence of the background.

• 通过提取成像主体的边缘区域作为对焦窗口，结合线性预测方法，实现了既保持上层成像目标清晰，又有效抑制下层背景干扰的自动对焦系统。