关键词: 显微视觉系统, 自动聚焦, 评价函数, 动态聚焦窗口, 爬山算法

Abstract: For the focus evaluation function, focus window and focus searching algorithm in auto-focusing processing are researched. Firstly, the Robert function has been improved as the evaluation function to increase the steepness. Secondly, for the fixed focusing window cannot find focusing objects accurately, a new method of dynamic selection focusing window is proposed, which divides the image into blocks, and uses the gradient variation of different sub-blocks to distinguish the objects and the background, the method is more adaptive. Then, the improved mountain climbing method which combines the large step and small step has been proposed, and the micro-vision system can find the focal plane more accurately by this method. Finally, experiments demonstrate the effectiveness of the method.

Key words: micro-vision system, auto-focusing, evaluation function, auto-focusing window, climbing algorithm