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