Adaptive Autofocus Technique Under Different Contrast

Rui-yu, 韩瑞雨 Han; Jin-jiang, 王晋疆 Wang; Kai, 聂凯 Nie; Yang, 刘阳 Liu

doi:10.3788/gzxb20124102.0222

光子学报

2012

DOI: 10.3788/gzxb20124102.0222

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Adaptive Autofocus Technique Under Different Contrast

韩瑞雨 Han Rui-yu¹,

王晋疆 Wang Jin-jiang²,

聂凯 Nie Kai³

et al.

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Searching algorithm of theodolite auto-focusing based on compound focal judgment

Liu

Zhan

et al. 2014

J Wireless Com Network

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Focusing of search judgment is one of the important parts of theodolite image measurement. Traditional hill-climbing search algorithm cannot usually focus accurately due to the interference of the evaluation function of the local extremum affected by measuring environment, such as light illumination. A compound auto-focal judgment combining image definition evaluation function and modulation transfer function (MTF) auxiliary function was introduced to improve the hill-climbing method. Definition evaluation function and MTF values of images were considered to judge the search direction together. Slanted-edge method was improved to calculate the image MTF values accurately based on the auto-selection of slanted-edge area. Lastly, the principle and implementation of the improved algorithm were given. In the theodolite auto-focusing system, the system imaging effect was validated, and different initial position and circumstances were considered using the proposed searching algorithm. The experiment results of theodolite auto-focus system show that the improved hill-climbing search algorithm can effectively eliminate the local extremum disturbance and make the system search focusing accurate and reliable.

show abstract

Searching algorithm of theodolite auto-focusing based on compound focal judgment

Liu

Zhan

et al. 2014

J Wireless Com Network

View full text Add to dashboard Cite

show abstract

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Adaptive Autofocus Technique Under Different Contrast

Cited by 1 publication

References 0 publications

Searching algorithm of theodolite auto-focusing based on compound focal judgment

Searching algorithm of theodolite auto-focusing based on compound focal judgment

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