Optimal Function Selection Based on Infrared Auto-Focusing Processes

LI Lu; WANG Gao; SHI Yuzhang; HAO Zhenghui

Volume 42 Issue 11

Nov. 2020

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LI Lu, WANG Gao, SHI Yuzhang, HAO Zhenghui. Optimal Function Selection Based on Infrared Auto-Focusing Processes[J]. Infrared Technology , 2020, 42(11): 1017-1021.

Citation:

LI Lu, WANG Gao, SHI Yuzhang, HAO Zhenghui. Optimal Function Selection Based on Infrared Auto-Focusing Processes[J]. Infrared Technology , 2020, 42(11): 1017-1021.

LI Lu, WANG Gao, SHI Yuzhang, HAO Zhenghui. Optimal Function Selection Based on Infrared Auto-Focusing Processes[J]. Infrared Technology , 2020, 42(11): 1017-1021.

Citation:

LI Lu, WANG Gao, SHI Yuzhang, HAO Zhenghui. Optimal Function Selection Based on Infrared Auto-Focusing Processes[J]. Infrared Technology , 2020, 42(11): 1017-1021.

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Optimal Function Selection Based on Infrared Auto-Focusing Processes

LI Lu^1
,,
WANG Gao^{1
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SHI Yuzhang¹,
HAO Zhenghui²

1.
North University of China, Taiyuan 030051, China
2.
Shanxi Daide Measurement and Control Technology Inc., Taiyuan 030006, China

Received Date: 2019-12-02
Rev Recd Date: 2020-09-08
Publish Date: 2020-11-20

Abstract

Abstract

Unlike the visible light auto-focusing system, the infrared auto-focusing system is divided into far-to-near focusing and near-to-far focusing owing to the special imaging principle of the infrared detector. The auto-focusing functions in the two processes are based on the analysis of the characteristics of the respective focusing function curves. To this end, five targeted evaluation indexes are used: sensitivity, the width of the steep part of the focusing curve, steepness, variance of the flat part of the focusing curve, and time. The 13 typical sharpness evaluation functions that are commonly used in quantitative analysis are conducted, and an optimal function suitable for the two focusing processes is proposed. The results show that F_Laplace can be used as the optimal function in the focusing process from near to far, and F_Laplace and FSML can be used as the optimal function in focusing from near to far.
- infrared,
- autofocus,
- focusing-function,
- evaluation index

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References(8)

References

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