摘要
研究了一体化摄像机光学镜头中变倍电机和聚焦电机的控制原理,实现了步进电机初始位置检测、图像变倍时变倍电机与聚焦电机的配合驱动。为了适应不同物距的变倍跟踪,提出了一种改进的灰度差分自动聚焦算法,计算当前图像的聚焦函数值并采用爬山搜索策略实现了图像的自动聚焦。整个系统采用VHDL实现,并在Xilinx Virtex-5 FPGA开发板上验证。
The control principle of zoom motor and focus motor in optical camera lens are studied. The initial position detection of step motor, the collaboration of zoom motor and focus motor when the image is zooming are realized. In order to satisfy zooming of different object distance, an improved gray scale differential auto-focus algorithm is proposed. According to the focus value of the current image and applying to the mountain climbing searching, the auto-focusing of image is realized. The whole design is realized in VHDL and verified on Xilinx Virtex-5 FPGA developing board.
出处
《电视技术》
北大核心
2010年第6期38-40,63,共4页
Video Engineering
基金
国家自然科学基金资助项目(60772101)
