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Low complexity DCT-based distributed source coding with gray code for hyperspectral images

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Journal of Systems Engineering and Electronics 2010年第6期21卷 927-933页

作者： Rongke Liu Jianrong Wang Xuzhou Pan School of Electronic and Information Engineering Beihang University B eijing 100191 E R. China

To compress hyperspectral images, a low complexity discrete cosine transform （DCT）-based distributed source coding （DSC） scheme with gray code is proposed. Unlike most of the existing DSC schemes, which utilize transform in spatial domain, the proposed algorithm applies transform in spectral domain. Set-partitioning-based approach is applied to reorganize DCT coefficients into waveletlike tree structure and extract the sign, refinement, and significance bitplanes. The extracted refinement bits are gray encoded. Because of the dependency along the line dimension of hyperspectral images, low density paritycheck-（LDPC）-based Slepian-Wolf coder is adopted to implement the DSC strategy. Experimental results on airborne visible/infrared imaging spectrometer （AVIRIS） dataset show that the proposed paradigm achieves up to 6 dB improvement over DSC-based coders which apply transform in spatial domain, with significantly reduced computational complexity and memory storage.

关键词： image compression hyperspectral images distributed source coding (DSC) discrete cosine transform (DCT) gray code band-interleaved-by-pixel (BIP).

Area Query Processing Based on gray code in Wireless Sensor Networks

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Tsinghua Science and Technology 2012年第5期17卷 499-511页

作者： Chunyu Ai Yueming Duan Mingyuan Yan Jing He Department of Computer Science Troy University Troy AL 36082 USA Department of Computer Science Georgia State University Atlanta GA 30303 USA Department of Computer Science Kennesaw State University Kennesaw GA 30144 USA

Area query processing is significant for various applications of wireless sensor networks since it can request information of particular areas in the monitored environment. Existing query processing techniques cannot solve area queries. Intuitively, centralized processing on Base Station can accomplish area queries via collecting information from all sensor nodes. However, this method is not suitable for wireless sensor networks with limited energy since a large amount of energy is wasted for reporting useless data. This motivates us to propose an energy-efficient in-network area query processing scheme. In our scheme, the monitored area is partitioned into grids, and a unique gray code number is used to represent a Grid ID （GID）, which is also an effective way to describe an area. Furthermore, a reporting tree is constructed to process area merging and data aggregations. Based on the properties of GIDs, subareas can be merged easily and useless data can be discarded as early as possible to reduce energy consumption. For energy-efficiently answering continuous queries, we also design an incremental update method to continuously generate query results. In essence, all of these strategies are pivots to conserve energy consumption. With a thorough simulation study, it is shown that our scheme is effective and energy-efficient

关键词： area query area query processing gray code wireless sensor networks

Digital image scrambling

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Progress in Natural Science:Materials International 2001年第6期11卷 56-62页

作者：丁玮闫伟齐齐东旭 Beijing 100041 Beijing 100080 CAD Laboratory China China CAD Research Center Chinese Academy of Sciences Institute of Computing Technology North China University of Technology

The purpose of digital image scrambling is to transform a given digital image into a rather scrambled one so as to make it difficult for other people to find out the true meaning of the scrambled image. This paper comes up with a certain number of approaches to scrambling digital images, which, when thus processed, cannot be reconstructed in a common way. As a result, the original image is encrypted and protected.

关键词： digital image scrambling cryptography magic square gray code Conway’s game.

A 14-bit wide temperature range differential SAR ADC with an on-chip multi-segment BGR

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Journal of Semiconductors 2011年第8期32卷 80-86页

作者：乔宁高见头赵凯杨波刘忠立于芳 Institute of Semiconductors Chinese Academy of Sciences Department of Electronic Engineering Tsinghua University

A 14-bit low power self-timed differential successive approximation（SAR） ADC with an on-chip multisegment bandgap reference（BGR） is *** on-chip multi-segment BGR,which has a temperature coefficient of 1.3 ppm/℃and a thermal drift of about 100μV over the temperature range of -40 to 120℃is implemented to provide a high precision reference voltage for the SAR *** gray code form is utilized instead of binary form mode control to reduce substrate noise and enhance the linearity of the whole ***-timed bit-cycling is adopted to enhance the time *** 14-bit ADC was fabricated in a TSMC 0.13μm CMOS process. With the on-chip BGR,the SAR ADC achieves an SNDR of 81.2 dB（13.2 ENOB） and an SFDR of 85.2 dB with a conversion rate of 2 MS/s at room temperature and can keep an ENOB of more than 12 bits at a conversion rate of 2 MS/s over the temperature range from -40 to 120℃.

关键词： differential successive approximation ADC self-timed bit-cycling gray code on-chip multi-segment BGR

3D surface reconstruction based on binocular vision using structured light

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Journal of Beijing Institute of Technology 2016年第3期25卷 413-417页

作者：马志峰韩福海王腾飞 School of Information and Electronics Beijing Institute of Technology Beijing 100081 China Troop 63600 People's Liberation Army Jiuquan 732750 Gansu China

A 3D surface reconstruction method using a binocular stereo vision technology and a coded structured light,which combines a gray code with phase-shift has been *** accuracy of the 3 D surface reconstruction mainly depends on the decoding of gray code views and phase-shift *** order to find the boundary accurately,gray code patterns and their inverses are projected onto a human eye plaster *** period dislocation between the gray code views and the phase-shift views in the course of decoding has been analyzed and a new method has been proposed to solve *** splicing method is based on feature *** result of the 3D surface reconstruction shows the accuracy and reliability of our method.

关键词： 3D surface reconstruction structured light gray code phase-shift

Pipelined Global Data Communication on Hypertoruses

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Journal of Computer Science & Technology 1992年第3期7卷 247-256页

作者：唐志敏 Institute of Computing Technology Academia Sinica Beijing 100080

This paper presents several effective global data communication algorithms on the hypertorus, or k- ary n-cube interconnection network, which is a generalization of the conventional hypercube structure. The timing ana... 详细信息

关键词： Span Tree Data Packet Data Item gray code Base Ring

Effect of gray Coding on The State and The Distribution of Data Bits in Cross Point Regions

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Effect of Gray Coding on The State and The Distribution of D...

机铰式注塑机锁模力的精确检测、自动调整及修正

2004 3rd International Conference on Computational Electromagnetics and Its Applications

作者： DANG Thanh Tin VU Dinh Thanh NGUYEN Kim Sach Seihaku HIGUCHI Faculty of Electrical and Electronic Engineering Hochiminh city University of Technology Department of Information System Engineering Faculty of EngineeringOsaka Sangyo University

This paper supplements the effect of gray code transformation on cross points which are neighbor to the points of gray levels 2 with gray codes of cross points on bit plane *** the natural characteristic of images,the data do not change much in a specific area,so at first the effect of gray codes is determined with an adjacent data set,then it will be generalized for real data without losing the generality of their statistical characteristics,espescially in medical images which contain many regions having the same gray scale.A further conclusion,being also a consequence of this effect,is the change of data bits for gray codes in the regions of cross points from original data *** makes the probabilities of data bits on specific bit planes in those regions and then the entropies of messages,be *** fact has important effects on encoding and decoding processes.

关键词： gray code cross poin cross point region probability of bits arithmetic coding

来源： cnki会议评论

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中国新技术新产品 2021年第2期 85-89页

作者：蔡国强蔡杰锋南京工业大学江苏南京211816 仲恺农业工程学院广东广州510225

注塑机更换模具后,由于模具厚度的改变,需要对机器进行匹配性调整,从而获得合适的锁模位置及锁模力。传统的机铰式注塑机往往采用渐近式的多次调整来达到近似的锁模力,但存在自动调模周期过长、成功率偏低的缺点。该文描述的方案将采用... 详细信息

注塑机更换模具后,由于模具厚度的改变,需要对机器进行匹配性调整,从而获得合适的锁模位置及锁模力。传统的机铰式注塑机往往采用渐近式的多次调整来达到近似的锁模力,但存在自动调模周期过长、成功率偏低的缺点。该文描述的方案将采用拉杆拉伸检测传感器,对锁模力进行精确地检测,并通过控制软件程序,实现锁模力快速、自动调整和修正的功能。

关键词：机铰式注塑机拉杆拉伸传感器 gray code 锁模力自动调整和修正