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Hierarchical distillation for image compressive sensing reconstruction

ELECTRONICS LETTERS 2021年第22期57卷 851-853页

作者： Lee, Bokyeung Ku, Bonhwa Kim, Wanjin Ko, Hanseok Korea Univ Elect Engn Seoul South Korea Agcy Def Dev Chinhae South Korea

Compressive sensing (CS) is an effective algorithm for reconstructing images from a small sample of data. CS models combining traditional optimisation-based CS methods and deep learning have been used to improve image reconstruction performance. However, if the sample ratio is very low, the performance of the CS method combined with deep learning will be unsatisfactory. In this letter, a deep learning-based CS model incorporating hierarchical knowledge distillation to improve image reconstruction even at varied sample ratios. Compared to the state-of-art methods with all compressive sensing ratios, the proposed method improved performance by an average of 0.26 dB without additional trainable parameters.

关键词： Optical, image and video signal processing image and video coding Computer vision and image processing techniques

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video coding using greedy decompositions on generalised bit-planes

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ELECTRONICS LETTERS 2002年第11期38卷 507-508页

作者： Caetano, R da Silva, EAB Ciancio, AG Univ Fed Rio de Janeiro PEE COPPE DELEE BR-21945970 Rio De Janeiro Brazil

A novel method for performing greedy decompositions using generalised bit-planes is proposed. It provides an elegant solution to the trade-off between quantisation of coefficients and number of passes in the matching pursuits algorithm. In addition. ss hen replacing the matching pursuits algorithm in video coding, it provides a significant performance improvement.

关键词： image and video coding generalised bit-planes video signal processing greedy decompositions matching pursuits algorithm video coding

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Factorisation for subclass of symmetric-antisymmetric multifilter banks and its application to image coding

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ELECTRONICS LETTERS 2000年第6期36卷 516-518页

作者： Gao, XQ Gan, L Zou, CR Southeast Univ Dept Radio Engn Nanjing 210096 Peoples R China

A complete and minimal factorisation is proposed for an important subclass of symmetric-antisymmetric multiwavelet filter banks (SAMFBs). Based on this factorisation, optimal SAMFBs are designed for image coding under an optimisation criterion. Experimental results show that the SAMFBs significantly outperform the traditional 9-7 wavelet in terms of coding efficiency, especially for hard-to-compress images.

关键词： optimisation symmetric-antisymmetric multifilter banks coding efficiency filtering theory image and video coding data compression hard-to-compress images Filtering methods in signal processing Optimisation techniques optimisation criterion image coding minimal factorisation zerotree image coder multiwavelet filter banks Signal processing theory image coding application Computer vision and image processing techniques

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Fractal image compression with simple classification scheme in frequency domain

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ELECTRONICS LETTERS 2000年第8期36卷 716-717页

作者： Jeng, JH Shyu, JR I Shou Univ Dept Informat Engn Kaohsiung 84008 Taiwan

In fractal image compression, the mean squared error (MSE) computations of the eight orientations of the domain blocks can be reduced into two groups of inner products in the frequency domain. A very simple classification scheme is presented for reducing the two groups of computations into one, which makes the encoder up to 4.7 times faster.

关键词： image and video coding data compression fractals encoder image coding frequency domain classification inner product fractal image compression mean squared error computation image classification mean square error methods

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Reduction of ringing noise in transform image coding using simple adaptive filter

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ELECTRONICS LETTERS 1998年第22期34卷 2110-2112页

作者： Kaup, A Siemens AG D-81730 Munich Germany

A numerically simple filter fcr reducing ringing noise in transform coded images is proposed. The filter adapts to the local image characteristics and has been specifically designed to amend the current deblocking fil... 详细信息

关键词： telecommunication standards transform coding image and video coding ringing noise transform image coding Filtering methods in signal processing objective image quality adaptive filter adaptive filters Codes video signal processing current deblocking filter Signal processing theory local image characteristics video coding subjective image quality block codes

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Pre-processing of SPIHT for lossy image coding

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ELECTRONICS LETTERS 2001年第11期37卷 687-688页

作者： Zhu, J Lawson, S Univ Warwick Sch Engn Coventry CV4 7AL W Midlands England

A simple but efficient pre-processing step for SPIHT (set partitioning in hierarchical trees) image coding is proposed. It reduces the computational complexity and increases the performance for lossy image coding.

关键词： trees (mathematics) set theory Combinatorial mathematics image and video coding image coding pre-processing Computational complexity computational complexity lossy image coding set partitioning Computer vision and image processing techniques hierarchical trees SPIHT

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Simple binary wavelet filters for efficient VLSI implementation

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ELECTRONICS LETTERS 1999年第7期35卷 555-557页

作者： Rassau, AM Chae, SI Eshraghian, K Univ Reading Dept Cybernet Reading RG6 6AY Berks England Seoul Natl Univ Sch Elect Engn Seoul 151742 South Korea

The performance of simple binary wavelet filters is investigated for VLSI implementations. Several low-complexity fillers were found to be useful for VLSI implementations of very low bit rate wavelet coders when hardw... 详细信息

关键词： Integral transforms in numerical analysis compression performance digital filters VLSI implementation very low bit rate wavelet coders Signal processing theory discrete wavelet transform filtering theory low-complexity filters data compression Digital filters image coding FIR filters hardware complexity minimisation Computer vision and image processing techniques wavelet transforms binary wavelet filters image and video coding Integral transforms VLSI Filtering methods in signal processing circuit complexity Computational complexity DWT computational complexity

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Quantisation step selection schemes in JPEG2000

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ELECTRONICS LETTERS 2002年第12期38卷 547-549页

作者： Long, M Tai, HM Yang, S Univ Tulsa Dept Elect Engn Tulsa OK 74104 USA

Modified quantisation step selection schemes for the uniform dead-zone scalar quantisation as used in Part I of the JPEG2000 standard are presented. Effects of these quantisation schemes on the lossy compression performance of 5/3 integer wavelet transforms are evaluated. The experiment is carried Out in the JPEG2000 framework. Similar consideration may be applied to the real wavelet transforms for lossy image compression.

关键词： wavelet transforms transform coding image and video coding data compression lossy compression performance image coding quantisation (signal) JPEG2000 standard uniform dead-zone scalar quantisation quantisation step selection schemes Computer vision and image processing techniques image compression integer wavelet transforms

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Watermark embedded in permuted domain

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ELECTRONICS LETTERS 2001年第2期37卷 80-81页

作者： Yen, JC Natl Lien Ho Inst Technol Dept Elect Engn Maioli Taiwan

A scheme is proposed in which a watermark is transformed and then used to modify the third, fourth, or fifth bit of the pixels in a permuted image according to a chaotic binary sequence. The PSNR is larger than 44dB a... 详细信息

关键词： image and video coding chaotic binary sequence data compression permuted domain chaos binary sequences copy protection image coding compression ratio PSNR watermark Computer vision and image processing techniques

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Improved searching scheme for fractal image coding

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ELECTRONICS LETTERS 2002年第25期38卷 1653-1654页

作者： Lai, CM Lam, KM Siu, WC Hong Kong Polytech Univ Dept Elect & Informat Engn Ctr Multimedia Signal Proc Hong Kong Hong Kong Peoples R China

The authors propose using a non-symmetric window to search for the best matched domain block based on the local variances method. Experimental results show that the proposed scheme can achieve a speedup of 50% with on... 详细信息

关键词： image and video coding data compression nonsymmetric window fractals image coding matched domain block search problems fractal image coding speedup compression ratio improved searching PSNR image representation reconstructed image Computer vision and image processing techniques local variances method

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