热成像系统自适应自动对焦算法

摘要

为了实现不同环境下热成像系统的准确对焦,本文针对现有自动对焦算法存在的问题开展研究,提出了一种热成像系统自适应自动对焦算法.通过对比实验系统采集图像的梯度算子评价函数曲线,确定最优最大梯度和清晰度评价函数,并以某一复杂场景为例,说明了最佳对焦位置搜索、对焦窗口选择和图像清晰度评价的具体实现方案.对多个复杂场景的自动对焦实验表明,本文提出的热成像系统自适应自动对焦算法能够有效解决复杂场景目标的准确对焦问题.%In order to realize accurate focusing for thermal imaging system under different backgrounds,an adaptive auto-focusing algorithm of thermal imaging system is proposed.The optimal definition evaluation function based on maximal gradient summation is determined by comparing different evaluation function curves collected by the experiment system.Taking a complex scene as an example,the implementation schemes on searching of optimal focus position,selecting of focus window and evaluation of image definition are described.The auto focusing experiment results of thermal imaging system in multiple complex scenes show that the adaptive auto-focus algorithm of thermal imaging system can effectively solve the problem of accurate focusing for targets in complex scenes.