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检索条件"任意字段=2017 Conference on Design and Architectures for Signal and Image Processing, DASIP 2017"

共 891 条记录，以下是401-410 订阅

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BLIND QUALITY ASSESSMENT OF MULTIPLY-DISTORTED imageS BASED ON STRUCTURAL DEGRADATION 24

BLIND QUALITY ASSESSMENT OF MULTIPLY-DISTORTED IMAGES BASED ...

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24th IEEE International conference on image processing (ICIP)

作者： Dai, Tao Gu, Ke Xu, Zhi-ya Tang, Qingtao Liang, Haoyi Zhang, Yong-bing Xia, Shu-Tao Tsinghua Univ Grad Sch Shenzhen Shenzhen Guangdong Peoples R China Beijing Univ Technol Fac Informat Technol Beijing 100124 Peoples R China Univ Virginia Dept ECE Charlottesville VA 22904 USA

ISBN: (纸本)9781509021758

It is known that images available usually undergo some stages of processing (e.g., acquisition, compression, transmission and display), and each stage may introduce certain type of distortion. Hence, images distorted by multiple types of distortions are common in real applications. Research in human visual perception has evidenced that the human visual system (HVS) is sensitive to image structural information. This fact inspires us to design a new blind/no-reference (NR) image quality assessment (IQA) method to evaluate the visual quality of multiply-distorted images based on structural degradation. Specifically, quality-aware features are extracted from both the first-and high-order image structures by local binary pattern (LBP) operators. Experimental results on two well-known multiply-distorted image databases demonstrate the outstanding performance of the proposed method.

关键词： image quality assessment (IQA) no-reference (NR) multiple distortions structural degradation local binary pattern (LBP)

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REVISITED HISTOGRAM EQUALIZATION AS HDR imageS TONE MAPPING OPERATORS 17

REVISITED HISTOGRAM EQUALIZATION AS HDR IMAGES TONE MAPPING ...

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17th IEEE International Symposium on signal processing and Information Technology (ISSPIT)

作者： Husseis, Anas Mokraoui, Anissa Matei, Basarab Univ Paris 13 Sorbonne Paris Cite Inst Galilee L2TI 99 Ave Jean Baptiste Clement F-93430 Villetaneuse France Univ Paris 13 Sorbonne Paris Cite Inst Galilee LIPN 99 Ave Jean Baptiste Clement F-93430 Villetaneuse France

ISBN: (纸本)9781538646625

High Dynamic Range (HDR) image provides higher perceptual quality such that it appears considerably more realistic and attractive for the human observer. Since most of current screens are Low Dynamic Range (LDR) screens, lots of researches have been proposed to design tone mapping algorithms converting the HDR images into a range that is suitable to display these tone mapped images on standard LDR screens. For this purpose, this paper first investigates the pixels distribution in the HDR image through the study of various traditional Histogram Equalization (HE) algorithms which were originally developed to improve the visual quality of LDR images such as the contrast enhancement of the latter. Moreover, a modification of the Histogram Adjustment based Linear to Equalized Quantizer (HALEQ), developed for HDR images, is proposed. Simulation results show that the proposed modification preserves more details than the original version of the algorithm in most parts of the HDR image.

关键词： Histograms Brightness Dynamic range Probability density function Visualization Entropy Lenses

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Extraction of working memory load and the importance of understanding the temporal dynamics 8

Extraction of working memory load and the importance of unde...

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8th International IEEE/EMBS conference on Neural Engineering (NER)

作者： Astrand, Elaine Ekstrom, Martin Malardalen Univ Sch Innovat Design & Engn Vasteras Sweden

ISBN: (纸本)9781509046034

Working memory processing is central for higher-order cognitive functions. Although the ability to access and extract working memory load has been proven feasible, the temporal resolution is low and cross-task generalization is poor. In this study, EEG oscillatory activity was recorded from sixteen healthy subjects while they performed two versions of the visual n-back task. Observed effects in the working memory-related EEG oscillatory activity, specifically in theta, alpha and low beta power, are significantly different in the two tasks (i.e. two categories of visual stimuli) and these differences are greatest after image onset. Furthermore, cross-task generalization can be obtained by concatenating both tasks and although similar performances are observed before and after image onset, this study highlights the complexity of working memory processing related to different categories of visual stimuli, particularly after image onset, that are crucial to understand, in order to interpret the extraction of working memory load.

关键词： Estimation Field programmable gate arrays OFDM Modulation Filtration Clocks signal processing algorithms

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HTTM - design and Implementation of a Type-2 Hypervisor for MIPS64 Based Systems

HTTM - Design and Implementation of a Type-2 Hypervisor for ...

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International conference on Communication, image and signal processing (CCISP)

作者： ul Ain, Qurrat Anwar, Usama Anwar, Usama Mehmood, Muhammad Amir Waheed, Abdul Univ Engn & Technol Al Khwarizmi Inst Comp Sci Lahore Pakistan

Virtualization has emerged as an attractive software solution for many problems in server domain. Recently, it has started to enrich embedded systems domain by offering features such as hardware consolidation, security, and isolation. Our objective is to bring virtualization to high-end MIPS64 based systems, such as network routers, switches, wireless base station, etc. For this purpose a Type-2 hypervisor is a viable software solution which is easy to deploy and requires no changes in host system. In this paper we present the internal design HTTM - A Type-2 hypervisor for MIPS64 based systems and demonstrate its functional correctness by using Linux Testing Project (LTP) tests. Finally, we performed LMbench tests for performance evaluation.

关键词： Virtualization

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Bit Allocation with Visual Attention and Visual Distortion Sensitivity 25

Bit Allocation with Visual Attention and Visual Distortion S...

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25th signal processing and Communications Applications conference (SIU)

作者： Pak, Mesut Bayazit, Ulug Istanbul Tech Univ Bilgisayar Muhendisligi Bolumu Istanbul Turkey

ISBN: (纸本)9781509064946

In this work, a novel bit allocation method based on visual attention and distortion sensitivity is developed for JPEG2000. Although, visual attention map for an image can be measured by using well-known saliency map methods, true visual attention map can be obtained by conducting experiments to determine fixation points and their durations. A perception model might turn these duration of fixations into visual attention levels. Besides visual attention, visual distortion sensitivity may guide the bit allocation process effectively. This is because human visual system is more sensitive to the distortion around the edges than the distortion in the complex textured areas. In this work, a novel visual distortion sensitivity method that considers all edges without using a threshold for gradient magnitude and uses local entropy of gradient orientation distribution is proposed. Thus, the visual attention and the distortion sensitivity level of each code-block determine its quantization parameters. Using bit allocation based on the visual attention map provides higher subjective evaluation score than using bit allocation based on the post compression rate-distortion optimization method or on a previously proposed method based on the saliency map. Secondly, it is shown that the use of visual distortion sensitivity allows higher objective evaluation scores to be attained.

关键词： visual perception attention human computer interaction eye fixation bit allocation visual distortion sensitivity image coding

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CODING SENSITIVE BASED APPROXIMATION ALGORITHM FOR POWER EFFICIENT VBS-DCT VLSI design IN HEVC HARDWIRED INTRA ENCODER 24

CODING SENSITIVE BASED APPROXIMATION ALGORITHM FOR POWER EFF...

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24th IEEE International conference on image processing (ICIP)

作者： Chang, Liangliang Liu, Zhenyu Ji, Xiangyang Wang, Dongsheng Tsinghua Univ RIIT Beijing 100084 Peoples R China Tsinghua Univ TNList Beijing 100084 Peoples R China Tsinghua Univ Dept Automat Beijing 100084 Peoples R China Tsinghua Univ IMETU Beijing 100084 Peoples R China

ISBN: (纸本)9781509021758

High Efficiency Video Coding (HEVC), emerging as the latest video coding standard, obtained a 50% bit-rate reduction while maintaining the competitive visual quality as H.264/AVC. Rate-Distortion Optimization (RDO) is a computation intensive module in HEVC encoding. In specific, during Intra coding, RDO accounts for 62% of the overall encoding time. The 2-dimensional DCT is the most area and power consuming component for VLSI implementation of RDO module. In this paper, we decompose the matrix multiplication of DCT into several sparse butterfly structures in series. In addition, the computation and the storage of 25% high frequency coefficients are dropped by our approximation algorithm. The proposed algorithms are integrated in HM15.0. It is verified that our methods could save 15.9% time with 1.03% BDBR augment. We further implement the DCT VLSI design using TSMC 90nm standard cell library. In worst conditions (125 degrees C, 0.9V), the power dissipation of our DCT is 12.7mW at the 311MHz maximum clock speed. As compared to the primitive design, we achieved 71.9% of hardware and 70.2% of power reductions.

关键词： DCT Intra Prediction HEVC Sparse Butterfly Decomposition VLSI

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Balanced Two-Stage Residual Networks for image Super-Resolution 30

Balanced Two-Stage Residual Networks for Image Super-Resolut...

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30th IEEE/CVF conference on Computer Vision and Pattern Recognition Workshops (CVPRW)

作者： Fan, Yuchen Shi, Honghui Yu, Jiahui Liu, Ding Han, Wei Yu, Haichao Wang, Zhangyang Wang, Xinchao Huang, Thomas S. Univ Illinois Beckman Inst Urbana IL 61801 USA Texas A&M Univ Dept Comp Sci & Engn College Stn TX 77843 USA

ISBN: (纸本)9781538607336

In this paper, balanced two-stage residual networks (BT SRN) are proposed for single image super-resolution. The deep residual design with constrained depth achieves the optimal balance between the accuracy and the speed for super-resolving images. The experiments show that the balanced two-stage structure, together with our lightweight two-layer PConv residual block design, achieves very promising results when considering both accuracy and speed. We evaluated our models on the New Trends in image Restoration and Enhancement workshop and challenge on image super-resolution (NTIRE SR 2017). Our final model with only 10 residual blocks ranked among the best ones in terms of not only accuracy (6th among 20 final teams) but also speed (2nd among top 6 teams in terms of accuracy).

关键词： Estimation Field programmable gate arrays OFDM Modulation Filtration Clocks signal processing algorithms

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Trace-driven exploration of sharing set management strategies for cache coherence in manycores 15

Trace-driven exploration of sharing set management strategie...

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15th IEEE International New Circuits and Systems conference (NEWCAS)

作者： Dumas, Julie Guthmuller, Eric Tortolero, Cesar Fuguet Petrot, Frederic Univ Grenoble Alpes F-38000 Grenoble France CEA Grenoble LETI MINATEC Campus F-38054 Grenoble France Univ Grenoble Alpes CNRS F-38031 Grenoble France TIMA Lab F-38031 Grenoble France

ISBN: (纸本)9781509049912

Doing early design space exploration for manycore architectures is a challenge, all the more when the focus is on complex coherence protocols. Implementing such protocols in realistic simulation models is costly both in modelling effort and execution time. We propose a trace-driven method to accurately compare cache coherence protocols while keeping cache modelling at a high level of abstraction. We show what kind of design space exploration can be performed on an existing sharing set implementation proposal, the linked list sharing set management. By doing so, we demonstrate that our approach, while being still fairly accurate, is much easier to develop and much faster to execute than state of the art low level simulators.

关键词： Estimation Field programmable gate arrays OFDM Modulation Filtration Clocks signal processing algorithms

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design and Implement of A Multifunctional image Keying System 4

Design and Implement of A Multifunctional Image Keying Syste...

引用

IEEE International conference on Consumer Electronics - Taiwan (ICCE-TW)

作者： Liu, Yi-Hsin Ciou, Jian-Jie Liou, Siou-Hong Chang, Cheng-Yuan Natl United Univ Dept Elect Engn Miaoli 36063 Taiwan

ISBN: (纸本)9781509040179

image matting is one of the most common image processing techniques, because it is often necessary to extract the desired foreground object from the original image and then to composite the extracted foreground with the another background. Over the years, there have been lots of commercial image processing tools or softwares which can support the human beings this function, such as photoshop, photoimpact and so on. However, it seems not very easy to use these tools, especially for most beginners who are not familiar with them. Moreover, these soft wares usually require payments from the users. In view of the above issues, a multifunctional image keying system which can provide two main functions: image composition and image matting for free and without complicated operations is proposed in this paper. The proposed system is mainly implemented by utilizing the closed form matting method and the trimap which the users simply and roughly provide, thus it can make the users achieve the purpose of performing the operations of the image matting and composite easily and quickly.

关键词： image color analysis Tools Computer vision conferences Gradient methods

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Research on image acquisition and preprocessing method for visual measurement of pipeline inner surface corrosion 13

Research on image acquisition and preprocessing method for v...

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2017 13th IEEE International conference on Electronic Measurement & Instruments (ICEMI)

作者： Li Zhonghu Zhang Lin Wang Jinming Yan Junhong Li Kang School of Information Engineering Inner Mongolia University of Science and Technology

ISBN: (纸本)9781509050369;9781509050352

According to the special background and actual demand of pipeline internal corrosion measurement, this paper designs the hardware system of pipeline internal surface corrosion image acquisition based on binocular vision, and re-optimizes the design of the original hardware platform. In order to meet the requirements of subsequent feature extraction, stereo matching and 3D reconstruction for image quality, The emphasis is to study image preprocessing method. This paper adopts adaptive median filtering method to remove image noise, histogram equalization and histogram normalization method to balance the luminance difference of the details, through image sharpening to enhance the details of the image and the edge of the image, so that the blurred image becomes clearer, to achieve the desired function.

关键词： Pipe inner surface Corrosion detection image acquisition image processing image denoising image sharpening

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