›› 2010, Vol. 23 ›› Issue (7): 21-24.

• 论文 • 上一篇    下一篇

基于FPGA的图像调焦系统研究

孙国强,白绳武   

  1. (西安电子科技大学 技术物理学院,陕西 西安710071)
  • 出版日期:2010-07-15 发布日期:2010-09-09
  • 通讯作者: 孙国强(1981-),男,硕士研究生。研究方向:实时图像处理。白绳武(1984-),男,硕士研究生。研究方向:实时图像处理。
  • 作者简介:孙国强(1981-),男,硕士研究生。研究方向:实时图像处理。白绳武(1984-),男,硕士研究生。研究方向:实时图像处理。

Study of the Image AutoFocusing System Based on FPGA

Sun Guoqiang,Bai Shengwu   

  1. (School of Technical Physics,Xidian University,Xian 710071,China)
  • Online:2010-07-15 Published:2010-09-09

摘要:

采用基于图像技术的自动调焦方法,根据图像分析出图形的质量,完成图像预处理、清晰度判别,获得当前的成像状况。通过控制电机,完成调焦操作。其中核心技术是分析图像质量评价函数。针对调焦算法计算量大、计算复杂等问题,采用中值滤波和灰度线性变换的图像预处理方法,流水线作业,“乒乓”操作,双蝶形处理器复用,基-2FFT算法相结合的工作模式。实验结果证实,本方法解决了自动调焦算法复杂系统控制的速度问题。

关键词: 自动调焦, 图像处理, 调焦操作

Abstract:

The autofocusing based on image technology is used to accomplishes image pretreatment,definition evaluation and judges the imaging state from the current image quality.The system can adjust focus distance correctly supervised by imaging state.The key technology is the image quality analysis function.Aiming at the enormous computation and high complexity of the autofocusing algorithm,the preprocessing method for combining the median filter with the linear transform of gray value,the pipelining structure,the “pingpong” working mode,the sharing processor of double butterfly shape and the base2FFT algorithm are presented.The research indicates that the autofocusing algorithm resolves the speed bottleneck of complex control systems.

Key words: autofocusing;image processing;focusing operation

中图分类号: 

  • TP39141