中国科学院机构知识库网格系统: 检索

First Nonhuman Primate-Sized Magnetic Particle Imaging System Based on Digital-Scanned Focus Field 期刊论文 OAI收割
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, 2024, 卷号: 73, 页码: 11
作者: Wei, Zechen; Liu, Yanjun; Liu, Sijia; Yu, Xiaomei; Zhang, Haoran

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收藏 | 浏览/下载：13/0 | 提交时间：2024/09/09

Coils Imaging Three-dimensional displays Magnetic fields Sensitivity Spatial resolution Permanent magnets Digital scanned focus field magnetic particle imaging (MPI) nonhuman primate (NHP)

Three-dimensional focal stack imaging in scanning transmission X-ray microscopy with an improved reconstruction algorithm 期刊论文 OAI收割
OPTICS EXPRESS, 2019, 卷号: 27, 期号: 5, 页码: 7787—7802
作者: Ma, LM; Zhang, XZ; Xu, ZJ; Spath, A; Xing, ZJ

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收藏 | 浏览/下载：35/0 | 提交时间：2019/12/30

TOMOGRAPHY NANOTOMOGRAPHY DEPTH FOCUS FIELD LOCALIZATION BEAMLINE

Variable aperture panoramic imaging 期刊论文 OAI收割
MULTIMEDIA TOOLS AND APPLICATIONS, 2018, 卷号: 77, 期号: 20, 页码: 26677-26695
作者: Lv, Jing; Zhao, Qiang; Dai, Feng; Ma, Yike; Zhang, Yongdong

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收藏 | 浏览/下载：34/0 | 提交时间：2019/12/10

Panoramic imaging Aperture Depth of field effect Focus cues

Dynamic three-dimensional shape measurement based on light field imaging 会议论文 OAI收割
Chengdu, PEOPLES R CHINAChengdu, PEOPLES R CHINA, JUN 26-29, 2018JUN 26-29, 2018
作者: Yang, Fan; Yan, Wei; Tian, Peng; Li, Fanxing; Peng, Fuping

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收藏 | 浏览/下载：41/0 | 提交时间：2019/08/23

Light field imaging dynamic three-dimensional shape measurement light field refocus focus ranging

Multi-slice ptychography with large numerical aperture multilayer Laue lenses 期刊论文 OAI收割
OPTICA, 2018, 卷号: 5, 期号: 5, 页码: 601-607
作者: Ozturk, H; Yan, HF; He, Y; Ge, MY; Dong, ZH

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收藏 | 浏览/下载：27/0 | 提交时间：2018/09/06

Ray-diffraction Microscopy X-ray Integrated-circuits Scan Ptychography Resolution Nm Scattering Focus Field

Methods of Depth Measurement and Image Fusion Based on Multi-focus Micro-images 会议论文 OAI收割
Guiyang, 25-27 May 2013
作者: Yin YingJie; Wang, Xingang; Xu, De; Zhang, Zhengtao; Bai, Mingran

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收藏 | 浏览/下载：22/0 | 提交时间：2016/06/20

Depth Measurement Depth Of Field Image Fusion Micro-image Multi-focus Sharpness Evaluation Function

Recent development of passive dynamic walking (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Energy, Environment and Sustainable Development, ICEESD 2011, October 21, 2011 - October 23, 2011, Shanghai, China
作者: Zhang P.

收藏 | 浏览/下载：29/0 | 提交时间：2013/03/25

The focus of this paper is a review on the recent development of passive dynamic walking. Passive dynamic walkers are introduced from the simple rimless wheel to the recently developed real two legged machines. Control strategies necessary to improve the stability and robustness of locomotion of passive dynamic walkers such as the hybrid geometric approach and the virtual constraints are discussed briefly. Finally the unresolved problems in the field of passive dynamic walking are summarized and directions of further developments are discussed. (2012) Trans Tech Publications Switzerland.

Design and fabrication of imaging optical systems with freeform surfaces (EI CONFERENCE) 会议论文 OAI收割
Current Developments in Lens Design and Optical Engineering XIII, August 13, 2012 - August 15, 2012, San Diego, CA, United states
作者: Zhang F.; Wang L.; Wang L.; Wang L.; He X.

收藏 | 浏览/下载：33/0 | 提交时间：2013/03/25

Freeform surfaces provide more degrees of freedom for design of optical systems and enhance the ability of compensation and correction aberrations. Freeform surfaces are of advantage to balance the unsymmetrical aberrations especially for the wide-field off-axis optical systems. This paper focus on an off-axis reflective optical system which focal length is 550mm F# is 6.5 and field of view (FOV) is 76. The system adopts some freeform surfaces. We discuss the problems we noticed in processes of design manufacture measurement and alignment and the solutions. At last the periodical research result and the expected performance are given. 2012 SPIE.

Multi-focus image fusion algorithm based on adaptive PCNN and wavelet transform (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Imaging Detectors and Applications, May 24, 2011 - May 26, 2011, Beijing, China
Wu Z.-G.; Wang M.-J.; Han G.-L.

收藏 | 浏览/下载：77/0 | 提交时间：2013/03/25

Being an efficient method of information fusion image fusion has been used in many fields such as machine vision medical diagnosis military applications and remote sensing.In this paper Pulse Coupled Neural Network (PCNN) is introduced in this research field for its interesting properties in image processing including segmentation target recognition et al. and a novel algorithm based on PCNN and Wavelet Transform for Multi-focus image fusion is proposed. First the two original images are decomposed by wavelet transform. Then based on the PCNN a fusion rule in the Wavelet domain is given. This algorithm uses the wavelet coefficient in each frequency domain as the linking strength so that its value can be chosen adaptively. Wavelet coefficients map to the range of image gray-scale. The output threshold function attenuates to minimum gray over time. Then all pixels of image get the ignition. So the output of PCNN in each iteration time is ignition wavelet coefficients of threshold strength in different time. At this moment the sequences of ignition of wavelet coefficients represent ignition timing of each neuron. The ignition timing of PCNN in each neuron is mapped to corresponding image gray-scale range which is a picture of ignition timing mapping. Then it can judge the targets in the neuron are obvious features or not obvious. The fusion coefficients are decided by the compare-selection operator with the firing time gradient maps and the fusion image is reconstructed by wavelet inverse transform. Furthermore by this algorithm the threshold adjusting constant is estimated by appointed iteration number. Furthermore In order to sufficient reflect order of the firing time the threshold adjusting constant is estimated by appointed iteration number. So after the iteration achieved each of the wavelet coefficient is activated. In order to verify the effectiveness of proposed rules the experiments upon Multi-focus image are done. Moreover comparative results of evaluating fusion quality are listed. The experimental results show that the method can effectively enhance the edge details and improve the spatial resolution of the image. 2011 SPIE.

Laser beacon adaptive optics ophthalmoscope for retinal multilayer imaging (EI CONFERENCE) 会议论文 OAI收割
2nd International Symposium on Bioelectronics and Bioinformatics, ISBB 2011, November 3, 2011 - November 5, 2011, Suzhou, China
作者: Xuan L.; Zheng X.; Li D.

收藏 | 浏览/下载：24/0 | 提交时间：2013/03/25

A flood-illuminated adaptive optics ophthalmoscope for retinal multilayer imaging is introduced in this paper. By arranging an alterable stop in the illumination path the illuminated area of retinal layer can be changed. A laser beacon for wavefront sensing is formed when the stop is a narrow aperture. The large aperture allows flood illumination and expands imaging field. A moveable imaging camera can focus on different layers of the retina. In the confirming experiment a subject who was a 25-years-old normal health Chinese male was imaged. We got clear images of photoreceptor layer blood vessels and nerve fiber layer. 2011 IEEE.