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IEEE International Conference on Communications

作者： Yanping Yang Wei Chen Ou Li Ke Ke Lajos Hanzo National Digital Switching System Engineering and Technological R&D Center Department of Electronic Engineering Tsinghua University School of Electronics and Computer Science University of Southampton

ISBN: (纸本)9781467364300

Advanced downlink (DL) decode-and-forward two-way relaying (DF-TWR) is developed for the sake of maximizing the attainable spectral efficiency. Network-coded phase-shift keying (NC-PSK) holds the potential of significantly increasing the data rate of the network, while adaptive modulation is a powerful technique of improving both the energy and spectral efficiency. Hence power-controlled adaptive NC-PSK has the potential of achieving performance enhancements over fading channels. Given this framework, based on the bit-error-ratio (BER) bounds developed, we derive the closed-form spectral efficiency for a continuous-rate, continuous-power adaptive NC-PSK scheme, where both the transmit power and the transmit rate are optimized subject to specific power- and BER- constraints. We then conceive and investigate a discrete-rate scheme relying on a pair of solutions proposed for maximizing the throughput of the network. Our simulation results reveal that the proposed schemes are capable of achieving a higher spectral efficiency than their fixed-power counterparts.

关键词： Fading Bit error rate Optimization Modulation Receivers Bandwidth Signal to noise ratio

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Anatomical information based panel PET image reconstruction using nonlocal means regularization

Anatomical information based panel PET image reconstruction ...

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IEEE Symposium on Nuclear Science (NSS/MIC)

作者： Shuai Wang Xiaoqing Cao Xiangyu Sun Bo Zhang Qingguo Xie Peng Xiao Biomedical Engineering Department Huazhong University of Science and Technology Wuhan China Biomedical Engineering Department Shenzhen city Tencent computer system Co. Ltd Wuhan China Wuhan Digital PET Technology Co.Ltd Wuhan China

In recent years, panel PET is an interesting field in medical imaging. But the major obstacle of panel PET is the limited view problem. Images reconstructed by traditional algorithms will suffer serious artifacts. Time-of-flight (TOF) information can be incorporated into the image reconstruction to remove the artifacts. However, the best system timing resolution available in current commercial PET scanners is about 500 ps, which is not precise enough to achieve satisfactory images. In this paper, a list mode reconstruction algorithm coupled with non-local means regularizer was formulated to improve the panel PET image quality. It incorporates the anatomical information into the non-local means regularizer and modifies the reconstructed image while it is updating. The results show that our proposed method could remove the distortions effectively without TOF information.

关键词： Positron emission tomography Image reconstruction Phantoms Distortion Liver Computed tomography Detectors

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Rotation Invariant Multiple Face-detection Architecture for Smart TV

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IERI Procedia 2014年 6卷 33-38页

作者： Jeahoon Choi Seong Joon Yoo Sung Wook Baik Ho Chul Shin Dongil Han Depertment of Computer Engineering Sejong University Seoul Korea Digital Contents Research Institute Sejong University Seoul Korea Robot Cognitive System Research Department Electronics and Telecommunications Research Institute (ETRI) Daejeon Korea

This paper suggests a design of high quality real-time rotation face detection architecture for gesture recognition of smart TV. For high performance rotated face detection, the multiple-MCT(Modified Census Transform) architecture, which is robust against lighting change, was used. The Adaboost learning algorithm was used for creating optimized learning data. The proposed hardware structure was composed of Color Space Converter, Image Resizer, Noise Filter, Memory Controller Interface, Image Rotator, Image Scaler, MCT Generator, Candidate Detector, Confidence Switch, Confidence Mapper, Position Resizer, Data Grouper, Overlay Processor and Color Overlay Processer. As a result, suggested face detection device can conduct real-time processing at speed of at least 30 frames per second.

关键词： MCT Adaboost FPGA Face detection Rotation Inariance

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Rotation Invariant Multiple Face-Detection Architecture for Smart TV

Rotation Invariant Multiple Face-Detection Architecture for ...

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2013 International Conference on Future Software engineering and Multimedia engineering(ICFM 2013)

作者： Jeahoon Choi Seong Joon Yoo Sung Wook Baik Ho Chul Shin Dongil Han Depertment of Computer Engineering Sejong University Digital Contents Research Institute Sejong University Robot Cognitive System Research DepartmentElectronics and Telecommunications Research Institute(ETRI)

关键词： MCT Adaboost FPGA Face detection Rotation Inariance

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The Design of HD Image Rectification Architecture Using Floating Point IP

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IERI Procedia 2014年 6卷 39-44页

作者： Dongil Han Jeahoon Choi Seong Joon Yoo Sung Wook Baik Ho Chul Shin Depertment of Computer Engineering Sejong University Seoul Korea Digital Contents Research Institute Sejong University Seoul Korea Robot Cognitive System Research Department Electronics and Telecommunications Research Institute (ETRI) Daejeon Korea

This paper proposes a real-time HD stereo images rectification hardware design architecture in order to remove vertical parallax of images caused by distortion within the cameras and alignment between them. After calculating calibration parameters of images using Matlab Toolbox designed by J.Y Bouguet as a prior step for the above purpose, the researcher designed rectification hardware based on the algorithms of Heikkilä and Silven. When stereo cameras are installed, it becomes difficult to find corresponding points owing to geometric errors between the cameras. However, in case corresponding points are located in the same line in two images, corresponding points can be found only in the line and therefore calculation becomes simple and errors are reduced. The line where the corresponding points are situated is called an epipolar line. In order to make the lines become an epipolar line, geometric image transformation technique called rectification should be used. Here, in order to heighten precision of result images, the researcher employed a floating point calculator generated using a core generator of Xilinx. Through this, it was verified that rectification hardware which has higher precision than other rectification hardware designed using a look-up table and which operates on a real-time basis may be designed.

关键词： Rectification Stereo-matching FPGA Real-time implementation Epipolar geometry

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The Design of HD Image Rectification Architecture Using Floating Point IP

The Design of HD Image Rectification Architecture Using Floa...

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2013 International Conference on Future Software engineering and Multimedia engineering(ICFM 2013)

作者： Dongil Han Jeahoon Choi Seong Joon Yoo Sung Wook Baik Ho Chul Shin Depertment of Computer Engineering Sejong University Digital Contents Research Institute Sejong University Robot Cognitive System Research DepartmentElectronics and Telecommunications Research Institute(ETRI)

This paper proposes a real-time HD stereo images rectification hardware design architecture in order to remove vertical parallax of images caused by distortion within the cameras and alignment between them. After calculating calibration parameters of images using Matlab Toolbox designed by J.Y Bouguet as a prior step for the above purpose, the researcher designed rectification hardware based on the algorithms of Heikkil? and Silven. When stereo cameras are installed, it becomes difficult to find corresponding points owing to geometric errors between the cameras. However, in case corresponding points are located in the same line in two images, corresponding points can be found only in the line and therefore calculation becomes simple and errors are reduced. The line where the corresponding points are situated is called an epipolar line. In order to make the lines become an epipolar line, geometric image transformation technique called rectification should be used. Here, in order to heighten precision of result images, the researcher employed a floating point calculator generated using a core generator of Xilinx. Through this, it was verified that rectification hardware which has higher precision than other rectification hardware designed using a look-up table and which operates on a real-time basis may be designed.

关键词： Rectification Stereo-matching FPGA Real-time implementation Epipolar geometry

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Use multiplexing to increase information in QR code

Use multiplexing to increase information in QR code

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8th International Conference on computer Science and Education, ICCSE 2013

作者： Vongpradhip, Sartid Digital System Engineering Laboratory Department of Computer Engineering Chulalongkorn University Bangkok Thailand

ISBN: (纸本)9781467344623

In this paper a novel approach to multiplex data in QR Code is presented. This technique can increase the amount of data, as the original information, in QR Code as well as keeping secret information. The original data for encoding is divided into smaller parts, each part will form QR Code pattern in its standard form. Each pattern is encoded or multiplexed and represented each module in QR Code with black and white special symbols. At the receiving end, this QR Code with special symbols (that was multiplexed) is decoded to give back the number of QR Code patterns that was multiplexed. These QR Code pattern can be read by the general QR Code reader and the data can be concatenated back to form its original information. © 2013 IEEE.

关键词： Concatenated codes

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A business model for video transmission services using dynamic adaptation streaming over HTTP 9

A business model for video transmission services using dynam...

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9th Advanced International Conference on Telecommunications, AICT 2013

作者： Rodríguez, Demóstenes Zegarra Rosa, Renata Lopes Bressan, Graça Laboratory of Computer Architecture and Networks Computer and Digital System Engineering Department University of São Paulo São Paulo Brazil

ISBN: (纸本)9781612082790

A business model for video transmission services is proposed that uses the Dynamic Adaptation Streaming over HTTP (DASH) mechanism using different versions of the same video. These video versions are encoded using different parameters, such as spatial resolution or number of frames per second. The transmission of each video version depends on the capabilities of the network at the end user point. The business model proposed considers different costs for each version of video fragments transmitted. The costs of video resolution upgrade are predefined by the service provider and used during the video streaming. Also, in this model, the user can either accept or reject an upgrade. Subjective tests were performed using different spatial resolutions of the same video, in which the interest level of users to perform a video upgrade is evaluated. Furthermore, the network architecture of the proposed solution is presented and the technical feasibility to deploy the proposed solution in commercial networks is shown. As a consequence, the proposed solution can improve the earnings of the video service provider. Copyright © 2013 IARIA.

关键词： Video streaming

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An improved method to embed larger image in QR code

An improved method to embed larger image in QR code

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International Joint Conference on computer Science and Software engineering (JCSSE)

作者： Chanon Skawattananon Sartid Vongpradhip Digital System Engineering Laboratory Department of Computer Engineering Faculty of Engineering Chulalongkorn University Bangkok Thailand

ISBN: (纸本)9781479908059

Embedding the owner image is the fundamental concept in identifying the ownership of the QR code. However, the image larger than the percentage of error correction, embedded in the QR code, could not be read. This research try to increase the size of the embedding image by investigating the change of encoding the pad characters and the adjustment of intensity of light. The largest image size that can be embedded and read through general QR code reader, with different errors correction levels, is found. The results are compared with other research on embedding an image in except the finder patternof QR code and our embedding images size are larger in all the correction levels.

关键词： Error correction codes Encoding Image coding Error correction ISO standards IEC standards Decoding

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Garbage collection and wear leveling for flash memory: Past and future

Garbage collection and wear leveling for flash memory: Past ...

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International Conference on Smart Computing (SMARTCOMP)

作者： Ming-Chang Yang Yu-Ming Chang Che-Wei Tsao Po-Chun Huang Yuan-Hao Chang Tei-Wei Kuo Institute of Information Science Academia Sinica Taipei Taiwan R.O.C. Graduate Institute of Networking and Multimedia National Taiwan University Taipei Taiwan R.O.C. Macronix International Co. Ltd. Emerging System Lab. Hsinchu Taiwan R.O.C. Department of Computer Science and Engineering Innovation Center for Big Data and Digital Convergence Yuan Ze University Taoyuan Taiwan R.O.C. Research Center for Information Technology Innovation Academia Sinica Taipei Taiwan R.O.C. Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan R.O.C.

ISBN: (纸本)9781479957125

Recently, storage systems have observed a great leap in performance, reliability, endurance, and cost, due to the advance in non-volatile memory technologies, such as NAND flash memory. However, although delivering better performance, shock resistance, and energy efficiency than mechanical hard disks, NAND flash memory comes with unique characteristics and operational constraints, and cannot be directly used as an ideal block device. In particular, to address the notorious write-once property, garbage collection is necessary to clean the outdated data on flash memory. However, garbage collection is very time-consuming and often becomes the performance bottleneck of flash memory. Moreover, because flash memory cells endure very limited writes (as compared to mechanical hard disks) before they are worn out, the wear-leveling design is also indispensable to equalize the use of flash memory space and to prolong the flash memory lifetime. In response, this paper surveys state-of-the-art garbage collection and wear-leveling designs, so as to assist the design of flash memory management in various application scenarios. The future development trends of flash memory, such as the widespread adoption of higher-level flash memory and the emerging of three-dimensional (3D) flash memory architectures, are also discussed.

关键词： Ash Memory management Performance evaluation Reliability Resource management Dynamic scheduling Organizations

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