监控相机的自适应调焦方法研究

Study on adaptive focusing method of monitoring camera

针对相机视场范围内运动目标的状态以及目标与相机距离等不确定性引起的监控画面模糊分辨率低的问题,提出了用改进Sobel清晰度评价函数和自适应变步距搜索算法相融合方法进行调焦。通过对采集的序列图像做清晰度算法处理,获得清晰度值,再对图像做自适应调焦算法处理,根据处理的结果,上位机发出指令信号控制电机运动状态,完成相机的快速自动调焦,最终获得高分辨率清晰图像。实验结果分析表明,该算法具有灵敏性好、实时性高的特点,相机调焦的实时性明显优于传统方法。

For field due to camera movement within the scope of target state and the uncertainty of the camera and the target distance, cause low resolution to monitor screen fuzzy problems, this paper USES the improved Sobel clarity evaluation function and adaptive variable step search focusing algorithm fusion method, through the acquisition sequence of frame image resolution algorithm processing, after winning sharpness value, adaptive focusing algorithm for image processing, according to the results of the treatment of upper machine instruction signal control motor movement, completed the rapid automatic focus of the camera, finally get the high resolution image. The experimental results show that the algorithm has good sensitivity and high real-time performance, and the real-time performance of frame image processing is better than the traditional method.