基于图像清晰度的快速自动聚焦算法

提出了一种新的快速自动聚焦算法;通过梯度阈值处理提高聚焦图像的信噪比,对选取的聚焦窗口采用图像边缘点判据与改进的Tenengrad聚焦函数相结合的方法,通过自适应变步长登山搜索算法实现了自动聚焦过程从快速粗调到精确细调的过渡;验证结果证明该算法和实际聚焦过程吻合,比已有的聚焦算法在聚焦可靠性、速度及灵敏度上有较大提高。

Implementation of Fast Auto-Focus Algorithm Based on Image Definition

To enhance the precision of video image processing,the advanced auto-focusing algorithm was proposed in the paper.While improving the image signal to noise ratio rate with gradient threshold,focus windows was evaluated through combining the modified focus value function and edge point count technique.Additionally,an adaptive and variable step-length MCS was utilized to realize the transition from fast rough adjustment to accurate one.Experimental results demonstrate that the new criteria work according to the fact,and the reliability,speed and sensitivity of auto-focus are enhanced compared with the existing methods.