Accurate and Rapid Auto-Focus Methods Based on Image Quality Assessment for Telescope Observation
Accurate and Rapid Auto-Focus Methods Based on Image Quality Assessment for Telescope Observation
复制标题
基于图像质量评估的望远镜观测精确快速自动对焦方法
DOI:
10.3390/app10020658
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发表时间:
2020-01
期刊:
影响因子:
--
通讯作者:
Zhenming Peng
中科院分区:
文献类型:
--
作者:
Chunping Yang;Minhao Chen;Fangfang Zhou;Wei Li;Zhenming Peng
Aiming at improving the speed and accuracy of auto-focus for telescope observation, algorithms for image estimation and auto-focus were investigated and are discussed in this article. Based on the image quality assessment, the auto-focusing process of the telescope system is realized by using the mountain-climb search method. Several evaluation functions were tested in different scenarios. It is demonstrated that the Tenengrad image estimation function (IEF) is suitable for an instant and accurate auto-focus process of the telescope. Furthermore, we implemented sampling and dynamic adaptive focusing window (ES-DAFW) methods with the Tenengrad IEF to enhance the sensitivity and accuracy of the auto-focus process. The experimental results showed that our ES-DATW method can provide more accurate results in less time for the auto-focus process compared to the conventional approaches, especially for a sparse image. These results promise significant applications to the auto-focusing of other telescopes with image quality assessment.
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