基于图像处理的自动聚焦系统的研究

介绍了基于图像处理的自动聚焦系统。该系统采用基于图像空域分析的聚焦方式,以及基于绿色分量的聚焦评价函数,通过对比分析得到了一系列聚焦评价函数的评价指标,选择Roberts梯度和算子作为系统的初次聚焦测度,以较大步距搜索至极点附近;选择Tenengrad函数进行小范围精调焦,利用五点数据进行曲线拟合得出正确聚焦位置。应用结果表明,该系统的自动聚焦准确性和速度有较大提高。

Automatic Focusing System Based on Image Processing

Automatic focusing system based on image processing was presented. The system adopted the focusing approach based on image airspace analysis, and the focusing evaluation function based on green component. By comparing, a series of focus evaluation function indexes were obtained. Choosing roberts gradient and operator to be the first Focus Measure, the pole was searched by large step. Tenengrad function was used for fine focusing in small range, and the correct focusing position was confirmed by curve fitting of five points data. The results showed that the focusing accuracy and velocity of the system were improved.