中国科学院机构知识库网格系统: 检索

The Intrinsic Structure of Sagittarius A* at 1.3 cm and 7 mm 期刊论文 OAI收割
Astrophysical Journal, 2022, 卷号: 926, 期号: 2, 页码: 108
作者: Cho, Ilje; Zhao, Guang-Yao; Kawashima, Tomohisa; Kino, Motoki; Akiyama, Kazunori

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收藏 | 浏览/下载：25/0 | 提交时间：2023/06/19

magnetically arrested accretion base-line interferometry scatter-broadened image supermassive black-hole event-horizon galactic-center radio-source vlbi observations nonthermal electrons synchrotron emission Astronomy & Astrophysics

Measurement on soil deformation caused by expanded-base pile in transparent soil using particle image velocimetry (PIV) 期刊论文 OAI收割
Journal of Mountain Science, 2017, 卷号: 14, 期号: 8, 页码: 1655-1665
作者: QI Chang-guang; ZHENG Jin-hui; ZUO Dian-jun; CHEN Geng

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收藏 | 浏览/下载：29/0 | 提交时间：2017/08/17

Geotechnical Physical Model Expanded-base Pile Transparent Soil Particle Image Velocimetry (Piv) Close-range Photogrammetry

Effect of secondary orientation on room temperature tensile behaviors of Ni-base single crystal superalloys 期刊论文 OAI收割
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2016, 卷号: 659, 页码: 130-142
Zhou, Z. J.; Wang, L.; Wang, D.; Lou, L. H.; Zhang, J.

收藏 | 浏览/下载：28/0 | 提交时间：2016/08/22

Ni-base single crystal superalloy Secondary orientation Holes Tensile test Digital image correlation technique In-situ scanning electron microscopy

An improved Bag-of-Words framework for remote sensing image retrieval in large-scale image databases 期刊论文 OAI收割
INTERNATIONAL JOURNAL OF DIGITAL EARTH, 2015, 卷号: 8, 期号: 4, 页码: 161-171
作者: Yang, Jin; Liu, Jianbo; Dai, Qin

收藏 | 浏览/下载：34/0 | 提交时间：2016/04/20

Bag-of-Words remote sensing image retrieval visual word base image

Image matching combine SIFT with regional SSDA (EI CONFERENCE) 会议论文 OAI收割
2012 International Conference on Control Engineering and Communication Technology, ICCECT 2012, December 7, 2012 - December 9, 2012, Shenyang, Liaoning, China
作者: Liu J.; Liu J.; Liu J.; Zhao J.

收藏 | 浏览/下载：55/0 | 提交时间：2013/03/25

Image matching is at the base of many computer vision problems such as object recognition or image stitching. Standard SIFT provides poor performance when images under viewpoint change conditions and with similar corners. Hence we propose a matching algorithm combine regional SSDA with simplified SIFT algorithm. We demonstrate through experiments that our algorithm yields better performance in images of viewpoint change and similar feature points. Besides the simplified algorithm cut down about half the time was originally needed in our tested images. 2012 IEEE.

A new low-bandwidth and wireless transmission scheme for CCd image (EI CONFERENCE) 会议论文 OAI收割
2012 International Symposium on Photonics and Optoelectronics, SOPO 2012, May 21, 2012 - May 23, 2012, Shanghai, China
作者: Zhang Y.

收藏 | 浏览/下载：45/0 | 提交时间：2013/03/25

The CCD (Charge-coupled Device) image sensor with its high resolution is capable of providing high definition image. However transmission requires high bandwidth which makes it very difficult to process and transmit in a long distance. The purpose of this paper is to propose a new method to process and transmit CCD image which can guarantee a low-bandwidth and long-distance data transmission. The innovation is that the transmission content of CCD image data can be flexibly selected and compressed firstly which will reduce the transmission data. Then it is processed on the base of communication protocol so that it can be fit for wireless transmission. At last it is transformed into wireless signal and transmitted using 3G technology. As a result the paper presents a wireless transmission scheme with the rate of 1.5Mbps for CCD image. 2012 IEEE.

Real-time adjusting of yaw angle of space camera based on General Image-Quality Equation (EI CONFERENCE) 会议论文 OAI收割
2009 2nd International Conference on Intelligent Computing Technology and Automation, ICICTA 2009, October 10, 2009 - October 11, 2009, Changsha, Hunan, China
作者: Wang J.; He X.; Xu S.

收藏 | 浏览/下载：35/0 | 提交时间：2013/03/25

A Strategy of Real-Time Adjusting of Yaw Angle (SRTAYA) of space camera was proposed base on General Image-Quality Equation (GIQE). During space camera imaging yaw angle which is caused by rotation of the earth and the gesture changing of satellite impacts integral aspect of TDI (Time Delay and Integration) CCD (Charge Couple Device) so that the image quality degrades. For extending imaging time of space camera and enhancing image quality yaw angle must be adjusted. The descending value of GIQE reflects the degrading quantity of image quality. The SRTAYA calculated an acceptable augmenting value of yaw angle according with a specific value of GIQE which the degrading of image quality can't be neglected no longer. The example which actualized a practical orbit of satellite illuminated that the SRTAYA could limit the value of yaw angle less than 318.45". 2009 IEEE.

CR image filter methods research based on wavelet-domain hidden markov models (EI CONFERENCE) 会议论文 OAI收割
ICO20: Optical Information Processing, August 21, 2005 - August 26, 2005, Changchun, China
作者: Wang J.-L.; Wang J.-L.; Li D.-Y.; Wang Y.-P.

收藏 | 浏览/下载：31/0 | 提交时间：2013/03/25

In the procedure of computed radiography imaging we should firstly get across the characters of kinds of noises and the relationship between the image signals and noises. Based on the specialties of computed radiography (CR) images and medical image processing we have study the filtering methods for computed radiography images noises. On the base of analyzing computed radiography imaging system in detail the author think that the major two noises are Gaussian white noise and Poisson noise. Then the different relationship of between two kinds of noises and signal were studied completely. By considering both the characteristics of computed radiography images and the statistical features of wavelet transformed images a multiscale image filtering algorithm which based on two-state hidden markov model (HMM) and mixture Gaussian statistical model has been used to decrease the Gaussian white noise in computed images. By using EM (Expectation Maximization) algorithm to estimate noise coefficients in each scale and obtain power spectrum matrix then this carried through the syncretized two Filter that are IIR(infinite impulse response) Wiener Filter and HMM according to scale size and achieve the experiments as well as the comparison with other denoising methods were presented at last.

A new algorithm of image segmentation for overlapping grain image (EI CONFERENCE) 会议论文 OAI收割
ICO20: Optical Information Processing, August 21, 2005 - August 26, 2005, Changchun, China
作者:

收藏 | 浏览/下载：25/0 | 提交时间：2013/03/25

Image segmentation is primary issue in image processing at the same time it is principal problem in low level vision in computer vision field. It is the key technology to process image analysis image comprehend and image depict successfully. Aim at measurement of granularity size of nonmetal grain a new algorithm of image segmentation and parameters calculation for overlapping grain image is studied. The hypostasis of this algorithm is present some new attributes of graph sequence from discrete attribute of graph consequently achieve that pick up the geometrical characteristics from input graph and new graph sequence which in favor of image segmentation is recombined. The conception that image edge denoted with "twin-point" is put forward base on geometrical characters of point image edge is transformed into serial edge and on recombined serial image edge based on direction vector definition of line and some additional restricted conditions the segmentation twin-points are searched with thus image segmentation is accomplished. Serial image edge is transformed into twin-point pattern to realize calculation of area and granularity size of nonmetal grain. The inkling and uncertainty on selection of structure element which base on mathematical morphology are avoided in this algorithm and image segmentation and parameters calculation are realized without changing grain's self statistical characters.

High-speed CCD camera system for the measurement of flight time of cannonballs (EI CONFERENCE) 会议论文 OAI收割
2005 Beijing International Conference on Imaging: Technology and Applications for the 21st Century, May 23, 2005 - May 26, 2005, Beijing, China
作者: Gong Y.

收藏 | 浏览/下载：36/0 | 提交时间：2013/03/25

We have built a high-speed sensitive camera system to capture the image sequence of cannonballs with accurate time reference which can measure the flight time of cannonballs between leaving the cannon and explosion precisely. The camera system is composed of two identical cameras of high frame frequency linear CCD calibrated with the same time base. In this paper we present the operating principle of the camera system and discuss the scheme of high-speed processing of volumes of image data. The real-time measurement less than 1 millisecond can be achieved by the proposed approach.