【摘要】 与传统的摄影调焦系统相比较,针对焦距可以在线调整的要求,提出了基于USB接口的可在线变速调焦应用系统的设计方案,利用USB2．0接口芯片为数据传输核心,通过主机端应用程序设置调焦曲线,实现了变速调焦的功能,实验结果表明,该系统调焦曲线与理想曲线拟合度较好,拍摄已知运动轨迹的目标,达到了满意效果。更多还原

【Abstract】 Some traditional adjusting focus photography systems are compared. According to the requirement of adjusting focus on-line, a scheme of adjusting focus with altered speed system is presented. Using USB2. 0 interface chip as main transmission unit, the focus can be adjusted by controlling the application program, and the function of adjusting focus can be accomplished. Finally the result given by experiment shows that the curve of adjusting focus is fit well with the ideal one. Shooting the goal of the known movement orbit has reached the satisfactory result.更多还原