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Power consumption of video decoding on mobile devices

Power consumption of video decoding on mobile devices

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International Symposium on Electronics in Marine (ELMAR)

作者： Damir Šoštarić Davor Vinko Snježana Rimac-Drlje Department of Communications J. J. Strossmayer University of Osijek Osijek Croatia

This paper investigates the impact of various codecs and coding parameters on power consumption of video decoding on mobile handheld devices. With limited battery capabilities of mobile device and with current trend of an increased demand on quality of video contents the power management becomes the vital aspect for mobile devices. Besides the decoding complexity, the file size of the investigated codecs is also taken into account. By using SSIM (Structural SIMilarity index) metric, the measured results for power consumption and storage demand are correlated with perceived video quality.

关键词： Power demand Streaming media Codecs Mobile handsets transform coding Decoding Current measurement

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A qualitative measure of Jpeg compressed image

A qualitative measure of Jpeg compressed image

引用

IEEE International Symposium on Virtual Environments, Human-Computer Interfaces and Measurement Systems (VECIMS)

作者： Giovanni Dimauro Claudia Trullo Antonella Fattizzo Nunzio Gianfelice Nicola Milella Dipartimento di Informatica Università degli Studi di Bari Aldo Moro Bari Italy

Data compression is widely used in many scientific areas and in a transparent manner in various daily life activities. Lossy data compression, eg in JPEG images, leads to the loss of part of the original information but usually not essential. In this paper we present a software system for the evaluation of the quality of compressed JPEG images. This system can act on different stages of Jpeg and allow to check the resulting change in the quality and compression.

关键词： Image coding transform coding Discrete cosine transforms Brightness Image color analysis Humans

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Area efficient, high-speed VLSI design for EBCOT block coder in JPEG 2000

Area efficient, high-speed VLSI design for EBCOT block coder...

引用

International Conference on Electronics And Information Engineering (ICEIE)

作者： Kishor Sarawadekar Swapna Banerjee Department of E & ECE Indian Institute of Technology Kharagpur India

With the growth in multimedia technology, demand for highspeed real time image compression system has also increased. JPEG 2000 standard is developed to cater such application requirements. However, the sequential execution of the bit plane coder (BPC) used in this standard consumes more clock cycles. To improve the performance of the BPC, a new concurrent context modeling technique is proposed in this paper. To study number of context generated in each clock cycle, analysis is carried out on five ISO grayscale images with size 512 × 512. The study revealed that about 58% of time more than 4 contexts are generated in one clock. Therefore, a new concurrent context coding architecture is proposed in this paper. It is implemented on Startix FPGA and the hardware requirement is reduced significantly, compared to similar architectures. Moreover, number of clock cycles required to encode a bit plane is reduced by 10% and it is minimum 2.5 times faster than the similar designs in existence. This design operates at 164.47 MHz, which makes it compatible for encoding HDTV 1920 × 1080 4:2:2 at 39 frames per second.

关键词： Computer architecture Context Encoding Image coding Clocks transform coding Discrete wavelet transforms

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MPEG-2/H.264 Transcoding with Vector Conversion Reducing Re-Quantization Noise

MPEG-2/H.264 Transcoding with Vector Conversion Reducing Re-...

引用

International Conference on Computer Communications and Networks (ICCCN)

作者： Takeshi Yoshitome Kazuto Kamikura Shoji Makino Nobuhiko Kitawaki NTT Cyber Space Laboratories NTT Corporation Yokosuka Japan Graduate School of Systems and Information Engineering University of Tsukuba Tsukuba Japan

We propose an MPEG-2 to H.264 transcoding method for interlace streams intermingled with frame and field macroblocks. This method uses the encoding information from an MPEG-2 stream and keeps as many DCT coefficients of the original MPEG-2 bitstream as possible. Experimental results show that the proposed method improves PSNR by about 0.190.31 dB compared with a conventional method.

关键词： transform coding Discrete cosine transforms Pixel Transcoding Quantization Noise

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Blocking artifacts reduction using adaptive bilateral filtering

Blocking artifacts reduction using adaptive bilateral filter...

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International Conference on Signal Processing and Communications, SPCOM

作者： V. K. Nath D. Hazarika A. Mahanta Department of Electronics and Communication Engineering School of Engineering Tezpur University Tezpur Assam India Department of Electronics and Communication Engineering Indian Institute of Technology Guwahati Guwahati Assam India

In this paper, we propose a simple, non iterative blocking artifacts reduction method for block discrete cosine transform (DCT) compressed images, using adaptive bilateral filter. Bilateral filter when applied on a input image, smooths out the blocking artifacts by weighted averaging of the pixel values without smoothing the edges. The proper selection of the bilateral filter parameters is very important and affects the filtering results significantly. We select the bilateral filter parameters optimally, through empirical study. The bilateral filter parameters are made adaptive to different decompressed images using different quantization tables. Our main contribution in this paper is to select the bilateral filter parameters optimally and adaptively through empirical study, in application to image deblocking. The proposed method shows highly encouraging results both objectively and subjectively, when compared to many state of the art image deblocking schemes including a recent method based on adaptive bilateral filter.

关键词： Quantization Image coding transform coding Discrete cosine transforms PSNR Pixel

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Research of Color Image Sequences Based on WTSOM and YCbCr

Research of Color Image Sequences Based on WTSOM and YCbCr

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International Conference on Multimedia Technology

作者： Shan Wang Dong Yan Han School of Information Engineering ECJTU Nanchang China

This article proposed a new algorithm to handle color image seqsuences. This new algorithm allows the processing sequence of three consecutive frames on the same principle as for fixed images. The goal is to enhance the reconstruction video frequency, even if transmits presents the wrong visual quality, and makes the transmission process to be as far as possible simple. This new algorithm is based on an association of a wavelet transform (WT), a vector quantization (VQ) and color image sequences of YCbCr format. The entire transmission chain's common use causes it to adapt complex and the low data rate channel completely. Simulation results show improved performance when compared to MPEG-4 code.

关键词： Image color analysis Wavelet transforms Image coding Color Modulation transform coding Bit error rate

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Effects of Image Lossy Compression on Palmprint Verification Performance

Effects of Image Lossy Compression on Palmprint Verification...

引用

2010 IEEE International Conference on Information Theory and Information Security(2010 IEEE 国际信息论与信息安全会议)

作者： Jizhi Wang Hengjian Li Yinglong Wang Jiashu Zhang Shandong Provincial Key Laboratory of computer Network Shandong Computer Science Center Jinan China Sichuan Province Key Lab of Signal & Information Processing Southwest Jiaotong University Chengdu

In this paper, we investigate the effects that the lossy image compression has on the performance competitive codes of palmprint verification algorithms. Effects of lossy compression on palmprint recognition performance are of interest in applications where image storage space and transmission time are of critical importance. To reconcile that goal with its implications for bandwidth and storage, we test the effects of image lossy compression on competitive code under different transforms, quantization and encoding algorithms using a publicly available palmprint database. Experiments performing recognition directly in the compressed domain show that the extracted feature template variation from the compressed palmprint image is not consistent with the image distortion. What is interesting, the effect on the JPEG is more serious than that of JPEG2000 when the compression ratio is bigger than about 11 while the effect on JPEG2000 is more serious than that of JPEG when the compression ratio is smaller than about 11. And the trellis coded quantized method is not suitable for compressing palmprint images.

关键词： Image coding transform coding Image recognition PSNR Classification algorithms transforms Face recognition

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Universal Steganographic Detection in JPEG Image Using the Graph Laplacian Semi-supervised Kernel

Universal Steganographic Detection in JPEG Image Using the G...

引用

International Symposium on Electronic Commerce and Security

作者： Zhifeng Liu Shangping Zhong College of Mathematics and Computer Science Fuzhou University Fuzhou China

ISBN: (纸本)9781424482313

Current image steganographic detection algorithms are unable to make full use of the geometry of unlabeled image examples, detection performance is subject to a few labeled examples, which is utilized for training. In this paper, we propose an effective steganographic detection method for JPEG image that rely on the overall dataset. The method is combined with semi-supervised kernel in the presence of unlabeled examples. Semi-supervised kernel method constructs data adjacency graph to obtain Gram matrix, then we obtain the proposed method by incorporating graph Laplacian into kernel-based algorithms, which is effective integration of the cluster assumption and manifold assumption. Our method utilizes the geometry of all examples with manifold regularization to produce smooth decision functions and thus improving the performance universal steganographic detection. Experimental results show the effectiveness of our proposed method.

关键词： Kernel Laplace equations Feature extraction Classification algorithms Support vector machines transform coding Manifolds

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Macroblock level hybrid temporal-spatial prediction for H.264/AVC

Macroblock level hybrid temporal-spatial prediction for H.26...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Mou Xiao Pin Tao Jianwen Chen Wenting Wu Jiangtao Wen Key Laboratory of Pervasive Computing Ministry of Education Tsinghua National Laboratory of Information Science and Technology Department of Computer Science Tsinghua University Beijing China

In this paper, a novel macroblock level hybrid temporal-spatial video coding framework is proposed. In this framework, a new Hybrid Temporal Spatial Prediction (HTSP) coding mode is adopted for each macroblock. Macroblock is divided into two partitions. The first partition is temporally predicted using motion compensation and encoded, while the second partition is spatially predicted using the reconstruction of the first partition. Experimental results show that up to 0.4 dB coding gain and 0.2 dB on average can be achieved for HD sequences.

关键词： Automatic voltage control Video coding Motion compensation High definition video Redundancy Spatial resolution Laboratories Decoding Encoding transform coding

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Joint robust watermarking and image compression

Joint robust watermarking and image compression

引用

IEEE International Workshop on Information Forensics and Security (WIFS)

作者： Yuhan Zhou Department of Electrical and Computer Engineering University of Waterloo Waterloo ONT Canada

A joint watermarking and compression (JWC) paradigm is considered for the application of JPEG image compression to achieve an efficient tradeoff among the embedding rate, compression rate, embedding distortion, and robustness against a class of “natural” signal processing attacks, including spatial filtering, image resizing and rotation, random row and column deleting, and JPEG2000 recompression. This paper makes two novel contributions: First, a new JWC embedding method called joint odd-even watermarking and JPEG compression scheme is proposed to optimize compression rate and embedding distortion when watermarks are embedded into JPEG compressed images. Second, low-density parity-check codes are employed into the JWC system to obtain an efficient tradeoff between the embedding rate and robustness. Experimental results show that the proposed algorithm significantly outperforms the recently designed DEW (differential energy watermarking), DQW (differential quantization watermarking) and RA-SEC (repeat-accumulate code based selectively embedding in coefficients) schemes, in terms of compression rate, embedding distortion and robustness under the same embedding rate.

关键词： Watermarking Image coding Parity check codes Robustness transform coding Quantization Joints

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