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Encoding and detection of image watermark

ELECTRONICS LETTERS 1999年第24期35卷 2099-2101页

作者： Chu, WC Illumea Corp Irvine CA 92604 USA

Some commonly used techniques for watermark encoding are analysed together with methods to improve detection accuracy.

关键词： image recognition image and video coding image detection detection accuracy image encoding image coding image watermark Computer vision and image processing techniques image recognition

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Efficient method for early detection of all-zero DCT coefficients

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ELECTRONICS LETTERS 2001年第3期37卷 160-161页

作者： Jun, S Yu, SY Shanghai Jiao Tong Univ Inst Image Commun & Informat Proc Shanghai 200030 Peoples R China

Based on the existing method, a more efficient algorithm for detecting all-zero DCT coefficient blocks before implementation of the discrete cosine transform and quantisation in very low bit rare video coding is proposed. The problem of the existing method is shown and an improved algorithm is provided. Simulation shows that the new method improves the detecting performance by similar to 10-20%.

关键词： image and video coding Integral transforms in numerical analysis early detection discrete cosine transform videophone applications quantisation all-zero DCT coefficients discrete cosine transforms video coding DCT coefficient blocks very low bit rate video coding videotelephony

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Motion estimation using low-bit oriented edge image for DCT-based video compression

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ELECTRONICS LETTERS 2001年第8期37卷 494-495页

作者： Qiu, XH Zhang, WJ Chen, HY Zhou, R Tsing Hua Univ Inst Microelect Beijing 100084 Peoples R China

A novel block-based motion estimation algorithm using a low-bit resolution oriented edge image (LROEI) is proposed. The algorithm produces difference blocks with little texture for DCT coding and enhances the encoding efficiency. Simulation based on a hierarchical subsampling telescope search confirms that the quality of the LROEI is superior to that of luminance image compared with HSTS using an 8 bit luminance image The operational loads are also reduced to 75 or 50% without quality degradation.

关键词： Integral transforms in numerical analysis DCT coding edge detection DCT-based video compression luminance image data compression encoding efficiency hierarchical subsampling telescope search HSTS quality degradation operational loads difference blocks motion estimation image and video coding low-bit oriented edge image video signal processing block-based motion estimation algorithm discrete cosine transforms video coding image recognition

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Efficient MPEG-4/H/263 video transcoder for interoperability of heterogeneous multimedia networks

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ELECTRONICS LETTERS 1999年第11期35卷 863-864页

作者： Dogan, S Sadka, AH Kondoz, AM Univ Surrey Ctr Commun Syst Res Guildford GU2 5HX Surrey England

As well as some similarities, there are a number of differences between MPEG-4 and the H.263 bitstream syntax. The inclusion of a video transcoder is proposed to achieve interoperability between the two video standards. This novel transcoding algorithm is proved to give highly improved service quality while reducing the complexity and the time delay of conventional cascaded decoding/re-encoding processes.

关键词： code standards telecommunication standards open systems Multimedia communications image and video coding data compression multimedia communication service quality improvement MPEG-4/H.263 video transcoder H.263 bitstream syntax transcoding algorithm heterogeneous multimedia networks video standards video coding interoperability telecommunication networks MPEG-4 bitstream syntax code convertors

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Data re-ordering technique for lossless LZW continuous-tone image compression

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ELECTRONICS LETTERS 1999年第20期35卷 1716-1717页

作者： Ng, KS Cheng, LM City Univ Hong Kong Dept Elect Engn Hong Kong SAR Peoples R China

A data re-ordering technique is proposed to enhance the compression performance of lossless LZW image compression over continuous-tone images. The proposed scheme incurs few overheads and functions as a preprocessing stage prior to actual compression. The compression performance is increased by an average of 18% for continuous-tone test images compared with the popular GIF compressor.

关键词： lossless LZW continuous-tone image compression image and video coding data compression image coding data re-ordering technique Computer vision and image processing techniques Lempel-Ziv-Welch compression preprocessing stage

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Accurate rate control method in transcoding

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ELECTRONICS LETTERS 2004年第1期40卷 16-18页

作者： Chen, L Cheng, LJ Yu, SY Shanghai Jiao Tong Univ Inst Image Commun & Informat Proc Shanghai 200030 Peoples R China

An accurate rate control method for transcoding is presented. A linear relationship between the number of bits generated from the quantised discrete cosine transform (DCT) coefficients and the number of nonzero DCT coefficients is used in this method. By estimating variation of average values of run-level codes at different bit rates, errors of model parameters are corrected. Good results compared to TM5 are reported.

关键词： average values variation quantised discrete cosine transform coefficients Integral transforms in numerical analysis number of bits generated quantisation (signal) model parameters quantisation parameters nonzero numbers run-level codes transcoding MPEG-2 video linear relationship transform coding image and video coding accurate rate control method compressed bitstream scaling video signal processing discrete cosine transforms video coding

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Comparison of perceptually uniform quantisation with average error minimisation in image transform coding

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ELECTRONICS LETTERS 1999年第13期35卷 1067-1068页

作者： Malo, J Ferri, FJ Albert, J Soret, J Univ Valencia E-46100 Valencia Spain

An alternative transform coder design criterion based on restricting the maximum perceptual error of each coefficient is proposed. This perceptually uniform quantisation of the transform domain ensures that the perceptual error will be below a certain limit regardless of the particular input image. The results show that the proposed criterion improves the subjective quality of the conventional average error criterion even if it is weighted with the same perceptual metric.

关键词： maximum perceptual error restriction transform coding image and video coding minimisation image transform coding image coding quantisation (signal) perceptually uniform quantisation transform coder design criterion Signal processing theory average error minimisation coding errors Computer vision and image processing techniques

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Adaptive resynchronisation marker positioning method for error resilient video transmission

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ELECTRONICS LETTERS 1998年第22期34卷 2084-2085页

作者： Yoo, KY Samsung Elect Co Ltd Corp Tech Operat Multimedia Lab Suwon South Korea

For reliable video transmission over error-prone mobile channels, an adaptive resynchronisation marker positioning (RMP) method is proposed for rapidly resynchronising the VLC decoding synchronisation which is often lost due to channel errors. The simulation results show that the proposed adaptive RMP method gives a remarkable improvement over the fixed RMP method.

关键词： coding errors error resilient video transmission error-prone mobile channels VLC decoding synchronisation variable length codeword image and video coding adaptive resynchronisation marker positioning method visual communication Codes synchronisation channel errors variable length codes video coding adaptive signal processing mobile communication decoding

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An orthogonal polynomials transform-based variable block size adaptive vector quantisation for colour image coding

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IET image PROCESSING 2012年第6期6卷 635-646页

作者： Krishnamoorthy, R. Punidha, R. Anna Univ Technol Comp Vis Lab Dept CSE Tiruchirappalli 620024 Tamil Nadu India

In this paper, a new adaptive vector quantisation with variable block size based on orthogonal polynomials is proposed for colour image coding. The input colour image is partitioned into fixed larger block sizes and the homogeneity/complexity of the local region is tested with the mean-normalised variance classifier. The homogeneous regions are encoded with fixed larger blocks and the complex regions are further divided into smaller block sizes for encoding as it gives the wealth of low-level information such as the high detail and high number of contrast edges. The integer-based orthogonal polynomials transform is then applied on the variable block sizes utilising the inter-correlation property of individual colour planes and interactions among the colour planes so as to reduce the vector dimension and hence the less computational cost. The proposed technique generates two dynamic codebooks and two backup codebooks adaptively and use rate-distortion cost criteria to encode both the homogeneous and complex regions separately. Since the proposed method encodes all the three colour components in single pass, the colour image encoding time is slightly higher than that of grey scale image coding but in contrast to three times in the existing colour image coding techniques.

关键词： backup codebooks grey scale image coding colour image coding techniques polynomials image colour analysis inter-correlation property computational cost input colour image Computer vision and image processing techniques integer programming image and video coding image coding Integral transforms complex regions variable block size adaptive vector quantisation low-level information Algebra colour image encoding time image classification mean-normalised variance classifier contrast edges integer-based orthogonal polynomials transform dynamic codebooks homogeneous regions rate distortion theory homogeneous redions transforms vector dimension rate-distortion cost criteria vector quantisation

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Spatial error concealment method based on POCS with a correlation-based initial block

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IET image PROCESSING 2007年第2期1卷 134-140页

作者： Kim, M. Lee, S.-W. Kim, S.-D. Korea Adv Inst Sci & Technol Dept EE&CS Div EE Taejon 305701 South Korea

A spatial error concealment method is proposed based on projections onto convex sets (POCS) with a correlation-based initial block. The conventional POCS results heavily depend on an initial block. To cope with this problem, a part of correctly received coefficients is utilised to find the most correlated neighbouring block, and a proper initial block is estimated from the found neighbouring block. The experiment shows that the proposed method has a much better performance.

关键词： set theory spatial error concealment method images correlation methods Computer vision and image processing techniques image and video coding POCS image coding Combinatorial mathematics projections onto convex sets correlation-based initial block

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