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检索条件"任意字段=2012 IEEE Visual Communications and Image Processing, VCIP 2012"

共 124 条记录，以下是91-100 订阅

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Efficient image/video deblocking via sparse representation

Efficient image/video deblocking via sparse representation

引用

ieee visual communications and image processing (vcip)

作者： Yi-Wen Chiou Chia-Hung Yeh Li-Wei Kang Chia-Wen Lin Shu-Jhen Fan-Jiang Department of Electrical Engineering National Sun Yat-sen University Kaohsiung Taiwan Institute of Information Science Academia Sinica Taipei Taiwan Department of Electrical Engineering National Tsing Hua University Hsinchu Taiwan

Blocking artifact, characterized by visually noticeable changes in pixel values along block boundaries, is a common problem in block-based image/video compression, especially at low bitrate coding. Various post-processing techniques have been proposed to reduce blocking artifacts, but they usually introduce excessive blurring or ringing effects. This paper proposes a self-learning-based image/ video deblocking framework via properly formulating deblocking as an MCA (morphological component analysis)-based image decomposition problem via sparse representation. The proposed method first decomposes an image/video frame into the low-frequency and high-frequency parts by applying BM3D (block-matching and 3D filtering) algorithm. The high-frequency part is then decomposed into a “blocking component” and a “non-blocking component” by performing dictionary learning and sparse coding based on MCA. As a result, the blocking component can be removed from the image/video frame successfully while preserving most original image/video details. Experimental results demonstrate the efficacy of the proposed algorithm.

关键词： Dictionaries image coding image decomposition Streaming media Training Transform coding image reconstruction

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Adaptive Depth edge sharpening for 3D video depth coding

Adaptive Depth edge sharpening for 3D video depth coding

引用

ieee visual communications and image processing (vcip)

作者： Rong Zhang Ying Chen Marta Karczewicz Qualcomm Inc. 5775 Morehouse Dr. San Diego CA USA

In 3D video systems with Multiview Video plus Depth (MVD) representation, intermediate views can be rendered from transmitted texture views and corresponding depth maps by techniques such as Depth image Based Rendering (DIBR). Recent standardization activities in MPEG include the development for such MVD based 3DV codecs. One codec which is H.264/AVC based is called 3DV-ATM. Because of compression, reconstructed depth maps often have certain distortions, such as blurry depth edges, which can result in noticeable artifacts in the rendered views. In this paper, a method of adaptive depth edge sharpening is proposed for 3D video coding, based on the 3DV-ATM. The proposed adaptive depth edge filtering and smoothing along depth edge techniques adaptively sharpen blurry edges of the reconstructed depth frames caused by compression. Compared to the anchor software 3DV-ATM, the proposed method achieves about 7.2% bitrate reduction on average for the rendered view PSNRs versus overall bitrates with comparable runtime complexity.

关键词： Filtering image edge detection Video coding Bit rate Codecs Encoding Smoothing methods

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Adaptive use of systematic bits in distributed video coding with multiple puncturing matrices

Adaptive use of systematic bits in distributed video coding ...

引用

ieee visual communications and image processing (vcip)

作者： Mohamed Haj Taieb Jean-Yves Chouinard Demin Wang Laval University Quebec QC Canada Communications Research Centre Canada Ottawa ON Canada

Distributed video coding paradigm aims at transferring the major part of the processing computation effort from the encoder to the decoder. Motion interpolation is done at the decoder to generate side information (SI) through motion compensated temporal interpolation (MCTI). SI is considered as a noisy version of the original data: channel control coding schemes, such as turbo coding, are used to eliminate the errors (SI inaccuracies). The video data is turbo encoded and the parity bits are sent to the decoder. The systematic bits, however, are discarded since the decoder already disposes of SI that can be used for the channel likelihood ratio calculations. However, when the MCTI generation of SI is highly corrupted, the channel likelihood ratios based on the SI are inefficient and even misleading. A number of parity bits number exceeding the original data length may then be required, thus leading to an undesirable expansion effect. In this paper, we propose a method to detect adaptively the situations where the SI is of lower quality. Then puncturing matrices, enabling systematic bits, are used to help computing reliable channel likelihood ratios. An improvement up to 0.5 dB is reported for PSNRs vs bit rate performances.

关键词： Systematics Decoding Silicon Video coding Discrete cosine transforms Codecs Streaming media

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Advances on Digital Television and Wireless Multimedia communications - 9th International Forum on Digital TV and Wireless Multimedia Communication, IFTC 2012, Proceedings

Advances on Digital Television and Wireless Multimedia Commu...

引用

9th International Forum on Digital TV and Wireless Multimedia Communication, IFTC 2012

ISBN: (纸本)9783642345944

The proceedings contain 69 papers. The topics discussed include: research on networked integration technology of remote sensing image processing;steganalysis in high-dimensional feature space using selective ensemble classifiers;parallel-friendly patch match based on jump flooding;skew estimation based on haar-like features;an efficient synthesizing and tone-mapping system for high dynamic range images;pathological signal quantitative analysis using quaternion-based image processing;an improved algorithm based on IHS transform for the fusion of object and scene;a new method used in moving vehicle information acquisition from aerial surveillance with a UAV;a robust bus detection and recognition method based on 3D model and LSD method for public security road crossing application;real-time human intrusion detection using audio-visual fusion;and interactive image segmentation based on grow cut of two scale graphs.

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Robust Color image Watermarking Scheme Using JFIF -YCbCr Color Space in Wavelet Domain

Robust Color Image Watermarking Scheme Using JFIF -YCbCr Col...

引用

6th International Conference on Information processing (ICIP 2012)

作者： Verma, A. K. Patvardhan, C. Lakshmi, C. Vasantha Dayalbagh Educ Inst Fac Engn Dept Elect Engn Agra Uttar Pradesh India Dayalbagh Educ Inst Fac Sci Dept Phys & Comp Sci Agra Uttar Pradesh India

ISBN: (纸本)9783642316852

In this paper, a. wavelet based color image watermarking scheme is proposed which utilizes a. specific version of gamma. corrected YCbCr color space used in JPEG File Interchange Format (JEW) to achieve maximum compatibility in cross platform JPEG file interchange and robustness against JPEG compression. To achieve both robustness and imperceptibility to the maximum possible extent, the watermark payload is divided into two parts. A smaller part with less embedding strength is embedded in Y (Luma) channel for good imperceptibility and robustness against compression attacks. The other larger part with higher embedding strength is embedded in Cr (Chroma) channel to achieve robustness against other types of attacks such as geometrical attacks and good imperceptibility. The proposed watermarking scheme utilizes spread spectrum technique. The performance results show that proposed scheme is more robust against a variety of attacks than other schemes available in literature.

关键词： Bior6.8 Correlation Embedding Strength Human visual System JFIF-YCbCr RGB Robustness Wavelets

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Camera Placement for Handheld 3D Video communications

Camera Placement for Handheld 3D Video Communications

引用

46th Asilomar Conference on Signals, Systems and Computers

作者： Mangiat, Stephen Gibson, Jerry Univ Calif Santa Barbara Santa Barbara CA 93106 USA

ISBN: (纸本)9781467350518

We investigate the effect of stereo camera separation on 3D perception and realism for handheld 3D video communications. Using a handheld device equipped with an autostereoscopic display, a front-facing stereo camera can capture left and right views of the user's face. However, consideration must be paid to the camera separation in order to balance both viewer comfort and realism. Using display-camera geometry, we illustrate the relationship between real depths in camera space and perceived depths in display space. We then derive the optimal camera separation to capture depths within a user's face that are consistent with the size of the face on a handheld display, and contrast this result with traditional rules of thumb used by stereographers. These recommendations are evaluated by a perceptual user study with a current 3D handheld device.

关键词： face recognition stereo image processing three-dimensional displays video cameras video communication visual perception

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Low bit-rate video coding via mode-dependent adaptive regression for wireless visual communications

Low bit-rate video coding via mode-dependent adaptive regres...

引用

ieee visual communications and image processing (vcip)

作者： Xianming Liu Xiaolin Wu Xinwei Gao Debin Zhao Wen Gao School of Computer Science and Technologv Harbin Institute of Technology Harbin China ECE Department McMaster University Ontario Canada School of Electronic Engineering & Computer Science Peking University Beijing China

In this paper, a practical video coding scheme is developed to realize state-of-the-art video coding efficiency with lower encoder complexity at low bit-rate, while supporting standard compliance and error resilience. Such an architecture is particularly attractive for wireless visual communications. At the encoder, multiple descriptions of a video sequence are generated in the spatio-temporal domain by temporal multiplexing and spatial adaptive downsampling. The resulting side descriptions are interleaved with each other in temporal domain, and still with conventional square sample grids in spatial domain. As such, each side description can be compressed without any change to existing video coding standards. At the decoder, each side description is first decompressed, and then reconstructed to original resolution with the help of the other side description. In this procedure, the decoder recover the original video sequence in a constrained least squares regression process, using 2D or 3D piecewise autoregressive model according to different prediction modes. In this way, the spatial and temporal correlation is sufficiently explored to achieve superior quality. Experiment results demonstrate the proposed video coding scheme outperforms H.264 in rate-distortion performance at low bit-rates and achieves superior visual quality at medium bit-rates as well.

关键词： Video coding Decoding Wireless communication Standards Wireless sensor networks Adaptation models visualization

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image transmission over Gilbert-Elliot and ITU fading channels using DVB-T2 channel coding and QPSK-OFDM

Image transmission over Gilbert-Elliot and ITU fading channe...

引用

2012 20th Signal processing and communications Applications Conference, SIU 2012

作者： Nurellari, Edmond Ince, Erhan A. Electrical and Electronic Engineering Eastern Mediterranean University Turkey

ISBN: (纸本)9781467300568

In this work, a concatenated forward error correction (FEC) scheme together with Orthogonal Frequency Division Multiplexing (OFDM) have been used for effective transmission of data/images over additive and fading channels. With a Bose Chaudhuri Hocquenghem (BCH) code as the outer code and a Low Density Parity Check (LDPC) code as the inner code, the transmission has been simulated over both the Gilbert-Elliot and ITU Rayleigh fading channels. The FEC parameters assumed throughout the simulations were obtained from the DVB-T2 standard and the Base Band (BB) frames were created by making use of shortening and zero-padding concepts. The results which have been presented in terms of BER and psycho-visual performances show the resilience of the FEC schemes and OFDM to channel impairments. The BER performances attained over the Gilbert-Elliot Channel (a channel that introduces burst errors when in the bad state) using LDPC only and BCH-LDPC concatenated coding indicated that the outer BCH coding will start to achieve a much lower BER after an SNR of 5 dB. Over the ITU-A Rayleigh fading channel it was observed that the performance increment due to the outer BCH encoder only become apparent after 6 dB when compared to the rate 1/4 LDPC only coded system BER performance. Over the Gilbert-Elliot channel a BCH-LDPC coded QPSK-OFDM system would provide a BER of 3×10-4 at 6 dB while the same BER for the ITU Vehicular-A channel was possible at 6.6 dB. © 2012 ieee.

关键词： Orthogonal frequency division multiplexing

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Harmonograph: A visual representation of sound

Harmonograph: A visual representation of sound

引用

ieee International Symposium on Intelligent Signal processing and Communication Systems (ISPACS)

作者： Eugene Mikyung Kim Department of Music Technology Korea National University of Arts Seoul South Korea

This paper presents a technique of extracting audio attributes - pitch, amplitude, timbre, and duration (time) by using a constant-Q transform in real-time performance and an algorithm of creating visual representatio... 详细信息

ISBN: (纸本)9781467350839

关键词： visualization image color analysis Timbre Filter banks Shape Harmonic analysis

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Parallel view synthesis programming for free viewpoint television

Parallel view synthesis programming for free viewpoint telev...

引用

ieee International Conference on Signal processing, communications and Computing (ICSPCC)

作者： Jae-Il Jung Yo-Sung Ho School of Information and Communications Gwangju Institute of Science and Technology Gwangju South Korea

View synthesis is one of the important techniques for free-viewpoint 3D image services. Unfortunately, computational complexity of depth image-based view synthesis is high, since it includes numerous matrix calculations and complex filters. In this paper, we implement the depth image-based rendering algorithm on a graphics processing unit (GPU) using the compute unified device architecture (CUDA). We perform memory uploads to the global memory of the GPU, and compute matrix calculations of all pixels in parallel. We also simplify the filters of rendering to reduce complexity and analyze performance according to block and image sizes. Experimental results show that our implementation is faster than conventional methods while preserving visual quality.

关键词： Graphics processing unit Cameras Rendering (computer graphics) visualization Acceleration Instruction sets image color analysis

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