Design of Video Processor with Auto-Focusing

ZHANG Bo; ZHANG Gang; CHENG Yong-qiang

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Design of Video Processor with Auto-Focusing

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- Design of Video Processor with Auto-Focusing
- Chinese Journal of Liquid Crystals and Displays Vol. 25, Issue 3, Pages: 396-400(2010)
- 作者机构：
  
  太原理工大学信息工程学院,山西太原 030024,E-mail:zhangbo0351@163.com
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN492
- Received：25 January 2010，
  
  Published Online：30 June 2010，
  
  Published：30 June 2010
- 稿件说明：
移动端阅览
张博;张刚;程永强. 具有自动聚焦功能的视频处理器的设计[J]. 液晶与显示, 2010,25(3): 396-400

ZHANG Bo;ZHANG Gang;CHENG Yong-qiang. Design of Video Processor with Auto-Focusing[J]. 液晶与显示, 2010,25(3): 396-400
张博;张刚;程永强. 具有自动聚焦功能的视频处理器的设计[J]. 液晶与显示, 2010,25(3): 396-400 DOI：

ZHANG Bo;ZHANG Gang;CHENG Yong-qiang. Design of Video Processor with Auto-Focusing[J]. 液晶与显示, 2010,25(3): 396-400 DOI：

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DDR2 SDRAM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。

Abstract

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.

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references

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. 施周渊,戴庆元.DDR SDRAM控制器的FPGA实现[J]. 电子技术应用, 2003,(11):61-63.

. Zhou Changguo, Kohn Leslie, Rice Daniel, et al. MPEG video decoding with the ultra SPARC visual instruction set //IEEE Computer Society International Conference, San Francisco, USA:IEEE Computer Society,1995:470-475.

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. 任四刚,李见为,谢利利.基于灰度差分法的自动调焦技术[J]. 光电工程, 2003,30(2):53-55.

. 白立芬,徐毓娴,于水,等.基于图像处理的显微镜自动调焦方法研究[J]. 仪器仪表学报 ,1999,12(6):612-614.

. 王宇新,贺圆圆,郭禾,等.基于FPGA的快速中值滤波算法[J]. 计算机应用研究, 2009, 26(1):224-226.

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