图像的能量波动对自动聚焦评价函数的影响

摘要

在基于图像处理的自动聚焦评价函数研究中发现，失效的评价函数曲线往往具有相似的形状，且与图像的均值曲线呈现相同的变化趋势。本文从评价函数数学原理角度分析了问题的原因，讨论了离焦模糊下图像能量波动对评价函数性能的影响及其处理方法。%During the research on auto focus image sharpness evaluation function, some functions failed to evaluate image sharpness tend to have similar shape of curves, and showed a consistent trend with the average of image. The reasons are analyzed from the mathematical perspective. The effect of image energy fluctuation on evaluation function and corresponding processing method are discussed. The reference to the design and application of sharpness evaluation function for a specific auto focus system is offered.