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Research on direction recognizing and subdividing method for moire (interference) fringes

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Chinese Optics Letters 2003年第12期1卷 692-694页

作者：楚兴春吕海宝曹聚亮 College of Mechanism Electronics Engineering and Automatization National University of Defence Technology Changsha 410073

A new direction recognizing and subdividing method for moire (interference) fringes is presented. By setting two certain thresholds, counting errors caused by direct voltage excursion are avoided. Counting and direction recognizing are discussed in detail. Experimental results are given. The better adaptability and large subdivision number are the good quality of this method.

关键词： Light interference Measurements optical resolving power

Face Super-resolution Reconstruction and Recognition Using Non-local Similarity Dictionary Learning Based Algorithm

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IEEE/CAA Journal of Automatica Sinica 2016年第2期3卷 213-224页

作者： Ningbo Hao Haibin Liao Yiming Qiu Jie Yang Wuhan University of Technology the School of Computer Science and Technology Hubei University of Science and Technology the Institute of Automation Chinese Academy of Sciences Jiangsu Jinling Sci & Tech Group Co. Ltd

One of the challenges of face recognition in surveillance is the low resolution of face region. Therefore many superresolution (SR) face reconstruction methods are proposed to produce a high-resolution face image from one or a set of low-resolution face images. However, existing dictionary learning based algorithms are sensitive to noise and very time-consuming. In this paper, we define and prove the multi-scale linear combination consistency. In order to improve the performance of SR, we propose a novel SR face reconstruction method based on nonlocal similarity and multi-scale linear combination consistency (NLS-MLC). We further proposed a new recognition approach for very low resolution face images based on resolution scale invariant feature (RSIF). A series of experiments are conducted on two public face image databases to test feasibility of our proposed methods. Experimental results show that the proposed SR method is more robust and computationally effective in face hallucination, and the recognition accuracy of RSIF is higher than some state-of-art algorithms. © 2014 Chinese Association of Automation.

关键词： Algorithms Learning algorithms optical resolving power

Programmable super-resolution pupil phase filter with a deformable mirror

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Chinese Optics Letters 2016年第9期14卷 35-40页

作者：赵丽娜戴云赵军磊肖飞张小军周晓军张雨东 The key laboratory on Adaptive Optics Chinese Academy of Science Chengdu 610209 China University of Electronic Science and Technology of China Chengdu 610054 China Chengdu University of Information Technology Chengdu 610225 China Institute of Optics and Electronics Chinese Academy of Sciences Chengdu 610209 China University of Chinese Academy of Sciences Beijing 100049 China

Compared with binary diffractive super-resolving elements, programmable super-resolution pupil filters permit the analysis of various filter designs and allow the filters to be changed rapidly to modify the response of an optical system. In this Letter, a deformable mirror is employed as a programmable super-resolution pupil phase filter. Continuous phase-only filters based on the Zernike polynomial series are designed by the genetic algorithm and fitted through closed-loop adaptive optics with a piezoelectric deformable mirror. Experimental superresolution results are in agreement with the theoretical predictions. This method has no polarization light requirement and is convenient for application.

关键词： Bandpass filters Deformation Genetic algorithms Mirrors optical resolving power optical systems

ns-scaled time-coding method for real-time 3D super-resolution range-gated imaging

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Chinese Optics Letters 2015年第8期13卷 40-44页

作者：卢德贞王新伟范松涛何军周燕刘育梁 Optoelectronics Systems Laboratory Institute of Semiconductors Chinese Academy of Sciences

We present a method of time coding with ABAB synchronization timing control for real-time 3D superresolution range-gated imaging （3DSRGI）. To meet the high precision of time delay and pulse width in ABAB synchronization time sequencing, phase shift is implemented to achieve ns-scaled delay and width accuracy without restoring to high clock frequencies. Theoretical analysis and experiments prove that 1 ns delay and width precision is obtained by our timing control unit based on a single field-programmable gate array with 5 ns clock cycle. Finally, a prototype experiment of 3DSRGI is demonstrated at a 10 Hz video rate with 696 pixels × 520 pixels.

关键词： Clocks Field programmable gate arrays (FPGA) optical resolving power Phase shift Phase shifters Pixels Time delay