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检索条件"主题词=transform coding"

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An improved MDCT domain frequency estimation method

An improved MDCT domain frequency estimation method

引用

IEEE China Summit & International Conference on Signal and Information Processing (ChinaSIP)

作者： Yujie Dun Guizhong Liu School of Electronic and Information Engineering Xi'an Jiaotong University Xi'an China

In this work, an improved low complexity high precision method for frequency estimation in the Modified Discrete Cosine transform (MDCT) domain is presented. The method is derived from the analytical expression of the MDCT coefficients of a sinusoid under symmetric windows. With this expression, frequency estimation under the sine and the Kaiser-Bessel Derived (KBD) windows can be made. This paper presents different procedures of the estimation under the sine and KBD windows according to their characteristics. The presented procedures have the ability to avoid estimation mistakes and large estimation errors. The method is tested to show great enhancement of the estimation precision when compared with the traditional methods, and can be used in compressed domain audio processing.

关键词： Estimation Abstracts Indexes Encoding Nickel transform coding Complexity theory

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Evaluation of chroma subsampling for high dynamic range video compression

Evaluation of chroma subsampling for high dynamic range vide...

引用

IEEE International Conference on Electronics, Circuits and Systems (ICECS)

作者： Ronan Boitard Mahsa T. Pourazad Panos Nasiopoulos University of British Columbia Vancouver Canada TELUS Communications Inc. Vancouver Canada

ISBN: (纸本)9781509061143

Subsampling chroma channels of video content is a processing performed in most video distribution pipelines. In such pipelines, chroma subsampled content also undergoes video coding, using a codec, before being distributed. Presently, it is common practice to optimize compression efficiency and visual quality of content with respect to its subsampled version rather than the original one. Although this may suffice for traditional imagery, it is unclear if emerging technologies such as Wide Color Gamut and High Dynamic Range are more sensitive to quality loss due to chroma subsampling. In this article, we assess the efficiency of chroma subsampling when compressing HDR content. We compare the performance of two different downsampling filters against the full chroma sampling. Objective results show that distributing 4:4:4 is more efficient than its 4:2:0 counterpart at medium to high bit-rates. For low bit-rates, this increase in efficiency is reduced and in some cases even reversed.

关键词： transform coding Color Pipelines Encoding Dynamic range Image color analysis Distortion

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Zero-error watermarking on jpeg images by shuffling huffman tree nodes

Zero-error watermarking on jpeg images by shuffling huffman ...

引用

IEEE Visual Communications and Image Processing (VCIP)

作者： Yongdong Wu Robert H. Deng Cryptography and Security Department Institute for Infocomm Research Singapore School of Infomation Systems Singapore Management University Singapore

This paper proposes a full fidelity watermarking on JPEG bitstreams. That is, without a designated decoder/player, the watermarked bitstream can be decompressed to the original one. To this end, the scheme modifies the JPEG Huffman tables and the bitstream synchronically according to the watermark. Thus it is unnecessary for the JPEG decompressor to recover DCT coefficients because they are not modified at all. In addition, the present scheme is applicable to any JPEG bitstream even if its Huffman tables are optimized.

关键词： transform coding Watermarking Vectors Discrete cosine transforms Image coding Decoding Multimedia communication

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Semi-fragile image watermarking algorithm based on visual features

Semi-fragile image watermarking algorithm based on visual fe...

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International Conference on Wavelet Analysis and Pattern Recognition (ICWAPR)

作者： Sheng-Bing Che Bin Ma Zu-Guo Che College of computer science Central South University of Forestry and Technology Changsha Hunan China

In order to improve the invisibility and the robust ness of semi-fragile watermark,at first the paper puts forward the idea which embedded watermark based on the attacks' characteristic, then the characteristic and its representation in DWT transform domain based on visual feature model, finally the Quantized Central Limit Theorem which applies to adjusting the coefficients i n general transform domain. These all make semi-fragile watermark embedded through dynamic quantization achieve the greatest robustness. It gives DWT coefficient redressal algorithm and the best restore probability of the pixel value adjusting in experiments when the images are under attack. It leads up to a better invisibility of carrier image and a better robustness to the image processing, such as JPEG compression, noise ad ding, filtering, and a larger amount of embedded information. What's more, the watermark bits are quarter of original image s size, and it can ascertain the position of vicious attack exactly.

关键词： Watermarking Discrete wavelet transforms Noise robustness Quantization Image restoration Pixel Image processing transform coding Image coding Information filtering

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An automatic approach to lossy compression of images corrupted by Poisson noise

An automatic approach to lossy compression of images corrupt...

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Microwaves, Radar and Remote Sensing Symposium, MRRS

作者： V.V. Lukin M.S. Zriakhov N.N. Ponomarenko Arto Kaarna Department of Transmitters Receivers and Signal Processing Kharkov National Aerospace University KhAI Kharkiv Ukraine Department of Information Technology Lappeenranta University of Technology Lappeeranta Finland

Lossy compression of images corrupted by Poisson noise is considered. Peculiarities on noisy images are discussed. An automatic approach in selection of a parameter that controls compression ratio (CR) is proposed. It is demonstrated how to reach optimal operation point (OOP), i.e., such CR that provides minimal peak signal-to noise ratio (PSNR) calculated between compressed and noise free images without having an actual noise-free image. A provided CR is of about 6....16 and it depends upon image complexity.

关键词： Image coding Chromium Additive noise PSNR Hyperspectral imaging Optical transmitters Optical noise transform coding Signal processing Filtering

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New Standardized Extensions of MPEG4-AVC/H.264 for Professional-Quality Video Applications

New Standardized Extensions of MPEG4-AVC/H.264 for Professio...

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IEEE International Conference on Image Processing

作者： Gary J. Sullivan Haoping Yu Shun-ichi Sekiguchi Huifang Sun Thomas Wedi Steffen Wittmann Yung-Lyul Lee Andrew Segall Teruhiko Suzuki Microsoft Corporation USA Thomson Inc. USA Mitsubishi Electric Corporation Limited Japan Panasonic Research and Development Center Germany GmbH Germany Sejong University South Korea Sharp Laboratories of America Inc. USA Sony Corporation Japan

To support high quality video applications, the Joint Video Team (JVT) has recently added five new profiles, two new supplemental enhancement information (SEI) messages, and two new extended gamut color space indicators to the MPEG4-AVC/H.264 video coding standard. The new profiles include substantial feature enhancements for high-quality video applications, including improved-efficiency 4:4:4 video format coding, improved-efficiency lossless macroblock coding, coding 4:4:4 video pictures using three separately-coded color planes, and support of bit depths up to 14 bits per sample. The new features were developed to support a wide range of applications where high quality video compression is demanded, including professional and semi-professional scenarios in particular. They also anticipate the introduction of higher fidelity displays. In this paper, the new extensions are presented along with quantitaive estimates of the benefits of the new features and a discussion o the target aplication environments.

关键词： Video compression Video coding Displays transform coding IEC standards Signal design Standards development Decoding Space technology Sampling methods

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Comparison of 3D set partitioning methods in hyperspectral image compression featuring an improved 3D-SPIHT

Comparison of 3D set partitioning methods in hyperspectral i...

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Data Compression Conference (DCC)

作者： Xiaoli Tang Sungdae Cho W.A. Pearlman Center for Image Processing Research Rensselaer Polytechnic Institute Troy NY USA

Summary form only given. Hyperspectral images were generated through the collection of hundreds of narrow and contiguously spaced spectral bands of data producing a highly correlated long sequence of images. An investigation and comparison was made on the performance of several three-dimensional embedded wavelet algorithms for compression of hyperspectral images. These algorithms include 3D-SPIHT, AT-3DSPIHT, 3D-SPECK (three-dimensional set partitioned embedded block), and JPEG2000. 3D-SPIHT is the three-dimensional extension of the state-of-the-art SPIHT (set partitioning in hierarchical trees) image compression algorithm. AT-SPIHT uses the same coding algorithms as 3D-SPIHT, but utilizes a more efficient, asymmetric tree structure. 3D-SPECK is a version of two-dimensional SPECK modified to encode 3D subband blocks. For an image sequence, 3D-DWT was applied to obtain a wavelet coefficient prism. This prism is partitioned into small code blocks with different sizes, and each subband is treated as a code block. A block splitting algorithm is used on the individual code blocks to test their significance. Compression performance was conducted on the mentioned algorithms using several AVIRIS (Airborne Visible Infrared Imaging Spectrometer) image sequences. The rate distortion performances were compared by means of the peak signal-to noise ratio (PSNR). The visual effect is considered a primary concern of hyperspectral imagery so an analysis of every algorithm's visual effect is in order. Through experimentation, AT-3DSPIHT provided high quality reconstructed images even at very low bit rate such as 0.4 bpp. A comparison was also conducted on JPEG200 and other algorithms concerning JPEG2000's multi-component images. The results have shown that AT-3DSPIHT, 3D-SPIHT and 3D-SPECK outperform JPEG2000 by the approximate range of 1 to 2.5 dB PSNR, depending on the image sequence.

关键词： Hyperspectral imaging Image coding Partitioning algorithms Image sequences PSNR Visual effects Image generation transform coding Tree data structures Wavelet coefficients

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JPEG2000. Part 10. Volumetric data encoding

JPEG2000. Part 10. Volumetric data encoding

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： P. Schelkens A. Munteanu A. Tzannes C. Brislawn Department of Electronics and Informatics Interdisciplinary Institute for Broadband Technology Vrije Universiteit Brussel Brussels Belgium Aware Inc. Bedford MA USA CCS Department Los Alamos National Laboratory Los Alamos NM USA

The joint photographic experts group (JPEG) committee (ISO/IEC JTC1/SC29/WG1) is currently pursuing the standardization of a three-dimensional extension of the JPEG-2000 standard (Parts 1 and 2) to support the encoding of volumetric data sets. This extension, Part 10 - extensions for three-dimensional data (JP3D), will support functionalities like resolution scalability, quality scalability and region-of-interest coding, while exploiting the entropy in the additional third dimension to improve the rate-distortion performance. In this paper, we give an overview of the markets and application areas targeted by JP3D, the imposed requirements and the algorithm under study

关键词： Encoding Image coding Optical microscopy Scalability Biomedical imaging Rate-distortion transform coding Computed tomography Magnetic resonance imaging Image storage

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Non-reference image quality assessment for biometric presentation attack detection

Non-reference image quality assessment for biometric present...

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International Workshop on Biometrics and Forensics (IWBF)

作者： Amrit Pal Singh Bhogal Dominik Söllinger Pauline Trung Andreas Uhl Universitat Salzburg Salzburg Salzburg AT Department of Computer Sciences University of Salzburg Austria

Non-reference image quality measures are used to distinguish real biometric data from data as used in presentation / sensor spoofing attacks. An experimental study shows that based on a set of 6 such measures, classification of real vs. fake iris, fingerprint, and face data is feasible with an accuracy of 90% on average. However, we have found that the best quality measure (combination) and classification setting highly depends on the target dataset. Thus, we are unable to provide any other recommendation than to optimise the choice of quality measure and classification setting for each specific application setting.

关键词： Distortion Discrete cosine transforms Databases Image quality Iris recognition Computational modeling transform coding

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Study of the subjective performance of a range of MPEG-2 encoders

Study of the subjective performance of a range of MPEG-2 enc...

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IEEE International Conference on Image Processing

作者： G. Keesman A. Cotton D. Kessler J. De Lameillieure J.-P. Henot A. Nicoulin D. Kalivas Philips Research Laboratories Eindhoven Netherlands BBC Research and Development UK HHI Germany EPF Lausanne Switzerland INTRACOM S.A. Greece

This contribution represents the results of subjective tests organized in November '94 by the HAMLET subgroup WP2. These tests, carried out in accordance with Rec. ITU-R 500-5, compare the performances of different types of MPEG-2 encoders: (1) the software encoder of the MPEG-2 technical documentation (reference); (2) an exact simulation of the hardware encoder that is being built in the same RACE project, (3) an optimized software encoder and (4) an SNR scalable encoder. The results reveal that the MPEG-2 standard leaves much room for optimization in the encoder. They also illustrate that optimizations carried out for the HAMLET hardware encoder lead to important improvements. Finally, they show the almost comparable quality of the MPEG-2 reference software encoder at 7 Mbit/s and the SNR scalable encoder at 3+4 Mbit/s for the base + enhancement layer.

关键词： transform coding Video compression Testing IEC standards ISO standards MPEG standards Bit rate Hardware Application software Decoding

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