摘要
图像法自动调焦的一个关键问题在于图像清晰度评价函数的选取,自动调焦的过程就是求取图像清晰度评价函数最大值的过程。针对普通的爬山搜索算法易受到调焦评价函数局部极值干扰而不能准确调焦的问题,提出了一种改进的爬山搜索算法。该算法以连续3次的调焦函数值的变化情况作为确定调焦方向的判据,有效地避免了局部极值的干扰。
A key issue of the image auto-focusing method is the selection of the focusing evaluation function. The procedure of auto-focusing is to get the maximum of the focusing evaluation function. Ordinary mountain-climb searching algorithm is apt to be disturbed by local extremum. To solve this problem, an improved mountain-climb searching algorithm is proposed. This arithmetic is effectively avoid the disturbance by using three consecutive changes of the focusing evaluation function as the criterion to confirm the focusing direction.
出处
《昆明冶金高等专科学校学报》
CAS
2010年第3期32-35,共4页
Journal of Kunming Metallurgy College
关键词
自动调焦
图像清晰度
调焦评价函数
爬山搜索算法
auto-focusing
image resolution
focusing evaluation function
mountain-climb searching algorithm
