基于图像处理的自动变焦人眼跟踪系统

在视觉人机交互中,为实现光学系统成像放大率不变,采用电动变焦镜头,基于图像处理跟踪人眼特征信息,自动变焦实现图像大小不变。系统以PC机为上位机对眼部图像处理,采用单片机为下位机对变焦镜头驱动控制,两者之间以串口通信。实验结果表明系统能根据人眼图像大小对变焦物镜作实时闭环控制,系统在400mm～1000mm距离内实现了连续变焦,距离分辨力为120mm。

Automatic zoom and eye track system based on image processing

In order to keep image-magnifying rate of optical system unchanged in eye-gaze human-computer interaction, automatic zoom is used to keep image size by motorized zoom lens and eye characteristic which is tracked based on image processing. A personal computer as master controller is applied for eye image processing and a single-chip microcomputer as slave controller for controlling the motorized zoom lens. Serial communication is designed between them. Experiments indicate that the system can achieve closed-loop control for zoom lens in real time according to the eye image size. The system's effective work distance is from 400mm to 1000mm and the distance resolution ratio is 120 mm.