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Journal of Projectiles, Rockets, Missiles and Guidance >

2021 , Vol. 41 >Issue 1: 135 - 138

DOI: https://doi.org/10.15892/j.cnki.djzdxb.2021.01.030

Auto-focus Algorithm Based on Multi-scale Focusing Window Strategy

  • ZHANG Chi 1 ,
  • HAN Dongyan 2 ,
  • RAN Di 1 ,
  • HU Kaiyu 3
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  • 1 The Ground Force Equipment Department No.7 Military Representative Office in Xi’an,Xi’an 710065,China
  • 2 Xi’an Modern Control Technology Research Institute,Xi’an 710065,China
  • 3 The Ground Force Equipment Department No.1 Military Representative Office in Nanyang,Henan Nanyang 710032,China

Received date: 2020-05-25

  Online published: 2025-02-11

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Abstract

To promote efficiency and real-time performance of auto-focus algorithm based on image processing, a multi-scale focusing window strategy is proposed. The focusing process is divided into two stages. At the first stage, a small focusing window is used to rapidly locate a local focusing position which is near the peak of sharpness evaluation function of original images. From that point, a bigger focusing window is adapted to accurately locate the global focusing position in fewer steps at the second stage. The experimental results indicate that the method can reduce the amount of calculation of the sharpness evaluation function and enhance the real-time performance of focusing process effectively.

Key words： focusing window; auto-focus; sharpness evaluation function; image processing

Cite this article

ZHANG Chi , HAN Dongyan , RAN Di , HU Kaiyu . Auto-focus Algorithm Based on Multi-scale Focusing Window Strategy[J]. Journal of Projectiles, Rockets, Missiles and Guidance, 2021 , 41(1) : 135 -138 . DOI: 10.15892/j.cnki.djzdxb.2021.01.030

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