| 基于无参考结构清晰度的自适应自动对焦方法 |
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| 引用本文： | 谢小甫,周进,吴钦章.基于无参考结构清晰度的自适应自动对焦方法[J].光电工程,2011,38(2):84-89. |
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| 作者姓名： | 谢小甫 周进 吴钦章 |
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| 作者单位： | 谢小甫,XIE Xiao-fu(中国科学院光电技术研究所,成都610209;中国科学院研究生院,北京,100039);周进,吴钦章,ZHOU Jin,WU Qin-zhang(中国科学院光电技术研究所,成都,610209) |
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| 摘 要： | 针对自动对焦系统,提出了一种基于单帧图像无参考结构清晰度的自适应变步长爬山搜索策略.该方法利用了无参考结构清晰度可提供的离焦量先验信息:当离焦量大时,大步距粗调快速逼近准焦位置;当离焦量小时,小步距微调准确定位准焦位置.该方法在不降低调焦精度的情况下,大大减少了自动对焦所需的图像数量和决策次数.实际系统实验结果表明,新...
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| 关 键 词： | 自动对焦 对焦函数 爬山搜索法 无参考结构清晰度 |
An Adaptive Autofocus Method Using No-reference Structural Sharpness |
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| XIE Xiao-fu,ZHOU Jin,WU Qin-zhang.An Adaptive Autofocus Method Using No-reference Structural Sharpness[J].Opto-Electronic Engineering,2011,38(2):84-89. |
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| Authors: | XIE Xiao-fu ZHOU Jin WU Qin-zhang |
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| Affiliation: | XIE Xiao-fu1,2,ZHOU Jin1,WU Qin-zhang1(1.Institute of Optics and Electronics,Chinese Academy of Sciences,Chengdu 610209,China,2.Graduate University of Chinese Academy of Sciences,Beijing 100039,China) |
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| Abstract: | An adaptive mountain-climb searching strategy based on No-Reference Structural Sharpness(NRSS) of single image is proposed for autofocus system.This new method utilizes the prior knowledge on defocusing amount provided by NRSS.If the imaging system is greatly defocused,a large step-size is used to approach the focusing position quickly;otherwise,a small step-size is used to locate the focusing position accurately.This method has the same focusing accuracy to mountain-climb strategy,and it greatly decreases ... |
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| Keywords: | autofocus focus function mountain-climb search strategy no-reference structural sharpness |
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