该系统是在现有的相机结构基础上，改变传统的有源调焦方式，从获取的数字图像中提取表征图像清晰度的特征，并以此为判别依据进行实时处理。-The system is based on the existing camera structure, change the traditional focus of active ways to get digital images from the extracted features of image clarity of characterization