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检索条件"主题词=transform coding"

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High-speed and low-power real-time programmable video multi-processor for MPEG-2 multimedia chip on 0.6 /spl mu/m TLM CMOS technology

High-speed and low-power real-time programmable video multi-...

引用

Asia and South Pacific Design Automation Conference

作者： Seung-Min Lee Jin-Hong Chung M.M.-O. Lee Department of Information & Communication Engineering Dong-shin University Naju South Korea

ISBN: (纸本)078035012X

We developed a Video Multi Processor (VMP) for image compression and decompression schemes of MPEG (especially MPEG-2) in this study. The VMP would apply to programmable architecture, various flexibilities to implement real-time image compression algorithm, and other many applications such as DVD-CD ROM authoring tool and videophone/teleconferencing systems. IO architecture of the VMP is designed for the multi-processor functionality in which uses many VMPs according to required arithmetic quantities of the system. Further, the architecture of the VMP system is simplified by processing the necessary peripheral IO system operations within the processor.

关键词： transform coding Image coding Reduced instruction set computing Video compression Streaming media Codecs Signal processing algorithms Arithmetic Process control CMOS technology

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Lossless image compression using BPNN predictor with contextual error feedback

Lossless image compression using BPNN predictor with context...

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International Multimedia, Signal Processing and Communication Technologies, IMPACT

作者： Emjee Puthooran R S Anand S Mukherjee Indian Institute of Technology Roorkee Roorkee India

In this paper, a lossless image coding scheme is proposed, which is based on Back Propagation Neural Network (BPNN) pixel value predictor, contextual error feedback and context adaptive arithmetic coding. The use of BPNN predictor in the proposed image compression scheme has resulted in improved compression ratio in comparison to the benchmark lossless compression schemes, LOCO-I and CALIC. The main advantage of BPNN pixel value predictor is its capability to adapt itself to the image being coded. The use of BPNN predictor resulted in lower values for entropy as compared to other predictors such as, MED (Median Edge Detection predictor) and GAP (Gradient-Adjusted Predictor) used in LOCO-I and CALIC respectively. The average bits per pixel (bpp) value obtained by utilizing the proposed scheme for nine test images indicate an improvement by 7.6% over LOCO-I, 2.85% over CALIC and 8.82% over JPEG2000 in lossless mode.

关键词： Image coding Entropy Context Neurons transform coding Context modeling Lakes

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Scaleable delivery mechanism for VBR MPEG-2 video streams over the Internet

Scaleable delivery mechanism for VBR MPEG-2 video streams ov...

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IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

作者： N.K. Agarwal A.K. Gupta Wang Bin L.O. Barbosa Nanyang Technological University Singapore Singapore JVC Asia Private Limited Singapore Singapore School of Information Technology and Engineering University of Ottawa Ottawa ONT Canada

Due to the ubiquitous nature of the Internet, it is being targeted to support video applications, such as video-on-demand (VOD). However, with the growing popularity of the Internet, congestion in the network poses a great hurdle in transferring real-time video data. For pre-compressed MPEG-2 video streams, the network may not be able to maintain acceptable level of quality of service (QoS) if there are insufficient resources available during the life of the connection. In such situations, we can use rate control to reduce the bit rate of the video according to the available resources. In this paper we propose a scaleable delivery mechanism for pre-compressed VBR MPEG-2 video streams, where the traffic rate is adapted according to the network congestion status. Using this scheme, a reasonable level of QoS is maintained when the network is congested. Based on the scheme a prototype system has been developed which demonstrates the usefulness of the scheme.

关键词： Streaming media Internet Video compression Spatial resolution Quality of service Bit rate Videoconference Degradation Frequency transform coding

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A Robust Watermarking Algorithm Adopting Double Embedding

A Robust Watermarking Algorithm Adopting Double Embedding

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International Conference on Intelligent Information Hiding and Multimedia Signal Processing (IIHMSP)

作者： Xiao-hua Qiao Shu-xun Wang Quan Wen Zhao Xu College of Communication Engineering Jilin University Changchun China

In this paper, an adaptive blind watermarking algorithm is proposed, which presents a new method of block classification based on the characteristic of visual masking of HVS (human visual system) model, including energy and variance. According to the new classification method, classify image blocks and select quantization pedometers adaptively to embed the watermark into DC component. At the same time, because of the shortage of watermark intensity only embedded into DC components, the algorithm presents that the same watermark is embedded into mid-frequency subbands by changing the order of these coefficients under invisibility. This is a blind watermarking algorithm, the watermark can be extracted without the original picture needed. Experimental results and attacks analysis show that the proposed algorithm is effective and robust to common image processing and some geometric attacks, such as JPEG lossy compression, scaling, additive noise, rotation, histogram equilibrium, contrast adjusting, brightness adjusting, filtering and so on.

关键词： Watermarking Humans Visual system Quantization Image analysis Algorithm design and analysis Filtering algorithms Noise robustness Image processing transform coding

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DWT based robust image hashing algorithm

DWT based robust image hashing algorithm

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International Conference on Networked Computing (INC)

作者： Yuanyuan Hu Xiamu Niu Information Security Technique Research Center Shenzhen Graduate School Harbin Institute of Technology Shenzhen China Information Countermeasure Technique Research Institute Harbin Institute of Technology Harbin China

ISBN: (纸本)9781424469864;9788988678206

JPEG 2000 is a wavelet-based image compression standard and coding system. It will supersede the original JPEG standard in the future. Compared with Counterlet transform or Gabor filter, wavelet transform used in JPEG 2000 is less effective to extract robust edge features. In this paper, a novel discrete wavelet transform (DWT) based image hashing algorithm is proposed. Robust bits of HL, LH and HH sub-band in the same middle-frequency scale are extracted first. Then, they are fused to generate the hash. Experimental results show that the proposed algorithm is highly robust to content preserving operations as well as having an excellent performance on tampering localization. In addition, since robust features are extracted in the same scale, the generation of hash is only needed to decode JPEG 2000 image code stream partially.

关键词： Discrete wavelet transforms Robustness Feature extraction Streaming media transform coding Image coding Decoding Authentication Wavelet transforms Gabor filters

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Compressive sensing image recovery based on equalization quantization noise model

Compressive sensing image recovery based on equalization qua...

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IEEE Visual Communications and Image Processing (VCIP)

作者： Zhen Zhang Yunhui Shi Baocai Yin College of Computer Science and Technology Beijing University of Technology Beijing China

Existing image codec technologies are based on transform which make image signal can be compressed, while quantization has been used to control bit rates. Compressive sensing (CS), which is a novel signal processing and recovery method, can be applied to image decoding to replace inverse transform reconstruction. This paper proposes an error estimate method based on equalization quantization noise model for image codec. Due to the robust character of CS, it can upgrade the quality of reconstruction when error has been estimated accurately. With designed equalization matrix, a new norm constraint which can enhance the quality of CS recovery significantly has been shown. A CS-based JPEG decoding scheme based on quantization error estimate is also presented, and experimental evidence exhibits more gains over CS reconstruction without error estimation and original JPEG decoder.

关键词： Quantization transforms Image reconstruction Noise transform coding Estimation Vectors

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Customizable MPEG-4 face player using real-time 2D image sequence

Customizable MPEG-4 face player using real-time 2D image seq...

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IEEE Workshop on Applications of Computer Vision (WACV)

作者： M.C. Shin D. Goldgof C. Kim Jialin Zhong Dongbai Guo University of South Florida Tampa FL USA Lucent Technologies Inc. Murray Hill NJ USA Oracle Corporation Nashua NH USA

This paper presents a framework for a customizable MPEG-4 face player using a FAPs (Facial Animation Parameters) sequence recovered from a real-time image sequence. First, the 3D nonrigid motion and structure of the facial features is recovered from a 2D image sequence and a "person-specific" model of the face. The model consists of the intensity and range image of the face. Then, the FAPs are computed from the recovered 3D structure. The customizable MPEG4 face animation is generated using a FAP sequence and a model of a specific person. The dataset of four face image sequences from three different face orientations equipped with range images are used. The GT (ground truth) results are generated using the 3D structure provided by range images. The results are evaluated quantitatively by comparing recovered FAP values, and qualitatively by comparing the generated MPEG-4 animations. FAPs are recovered up to 8% (relative) and 16 FAP units (absolute) accuracy and the animation is nearly identical to the MPEG-4 animation using GT FAPs.

关键词： MPEG 4 Standard Image sequences Facial animation Financial advantage program Motion analysis Facial features transform coding Head Tracking Integrated optics

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Analysis of watermarking techniques in video

Analysis of watermarking techniques in video

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International Conference on Hybrid Intelligent Systems (HIS)

作者： Hamid Shojanazeri Wan Azizun Wan Adnan Sharifah Mumtadzah Syed Ahmad M. Iqbal Saripan Department of Computer and Communication System Engineering Universiti Putra Malaysia Serdang Malaysia

Video piracy has become an increasing problem particularly with the proliferation of media sharing through the advancement of internet services and various storage technologies. Thus, research in copyright protection mechanisms, where one of which includes digital watermarking has been receiving an increasing interest from scientists especially in designing a seamless algorithm for effective implementation. Basically digital watermarking involves embedding secret symbols known as watermarks within video data which can be used later for copyright detection purposes. This paper presents the state of the art in video watermarking techniques. It provides a critical review on various available techniques. In addition, it addresses the main key performance indicators which include robustness, speed, capacity, fidelity, imperceptibility and computational complexity.

关键词： Watermarking transform coding Robustness Discrete cosine transforms Streaming media Vectors Discrete wavelet transforms

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Copy-Move Image Forgery detection via Combined Pseudo-Zernike Moment Invariant

Copy-Move Image Forgery detection via Combined Pseudo-Zernik...

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International Conference on Energy, Power and Environment: Towards Sustainable Growth (ICEPE)

作者： Raimoni Hansda Rajashree Nayak Bunil Kumar Balabantaray National Institute of Technology Meghalaya Shillong India

ISBN: (纸本)9781665430869

Copy-move image forgery (CMIF) is one of the greatest threats in the field of image forensic analysis where a small region of an image is copied and pasted at other positions of the same image. This paper proposes a hybrid copy-move image forgery detection (CMIFD) approach. Initially, the SIFT algorithm is applied to the entire image and the extracted key-points are matched via 2NN process to obtain matched key-points. Furthermore, larger blocks are formed around each matched key-points followed by the computation of Combined Pseudo Zernike moment invariants (CPZMI) for each block. CPZMI feature descriptors of these blocks are simultaneously invariant to rotation, scaling, blurring and robust to noise. Consequently, comparison of CPZMI feature descriptors allows us to obtain stable matched key-points. Our proposed CMIFD technique is validated using benchmark datasets and found to exhibit better performance as compared with existing state-of-the-art techniques.

关键词： Degradation Image forensics Image coding Image color analysis Brightness transform coding Benchmark testing

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Remote management multimedia content and interactive applications deployed on a iTV environment

Remote management multimedia content and interactive applica...

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Conferencia Latinoamericana En Informatica (CLEI)

作者： Johan E. Tique R. Gaby E. Zemanate R. José L. Arciniegas H. Departamento de Telemática Universidad del Cauca Popayán Colombia Es profesor titular adscrito al departamento de Telematica Universidad del Cauca Popayán Colombia

This paper presents a system to support multimedia content and interactive applications management in a iTV environment using DVB standard, taking into account the loading, updating, editing, deleting, planning and control them, through the implementation and validation of a distributed component-based scheduler supported on a WEB environment. Emphasizing the importance of the capacities acquired by the television service: organization, adaptation, control, efficiency and planning, when it's associated with a management system.

关键词： Multimedia communication Streaming media Digital video broadcasting transform coding Irrigation TV Multiplexing

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