介绍自动对焦的文章主要介绍了对焦技术探测技术包括频域分析目标函数目标函数效能验证影像评估效能之因素高斯低通滤波器参数的选取自动对焦技术以及相关实验结果与分析-Introduction Auto focus of the article introduces the focus technology, detection technology　including frequency domain analysis, the objective function, the objective function performance verification, image assessment of the effectiveness of the factors, Gaussian low-pass filter parameter selection, auto-focus technology　and related experimental results and analysis.