摘要
介绍了一种视频处理器的设计,该处理器接收数字YCbCr视频信号,利用一片DDR2SDRAM存储器作为帧缓存,对接收的视频信号进行格式转换、帧率提升、色空间转换。提出并实现一种改进的自动聚焦算法,实时计算当前帧图像的聚焦评价函数值,选用爬山搜索策略实现对聚焦电机的控制,使当前图像的聚焦函数值最大,实现图像的自动聚焦。该设计采用VHDL语言实现,在Xilinx XUPV5-LX110T FPGA开发板上验证。
The paper introduces the design of a kind of video processor with the function of auto-focusing.The video processor receives digital YCbCr video signal.Utilizing a piece of DDR2 SDRAM as frame buffer,the video processor realizes the function of format conversion,frame up-scaling and color space conversion.The paper proposes and realizes an improved gray scale differential auto-focus algorithm and calculates the focus value of the current image real-timely.The mountain climbing searching strategy is applied to control the moving of the focus motor,and the auto-focusing of image is realized.The whole design is realized in VHDL and verified with Xilinx XUPV5-LX110T FPGA developing board.
出处
《液晶与显示》
CAS
CSCD
北大核心
2010年第3期396-400,共5页
Chinese Journal of Liquid Crystals and Displays
基金
国家自然科学基金资助项目(No.60772101)
