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检索条件"主题词=image and video coding"
281 条 记 录,以下是201-210 订阅
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Perceptual adaptive quantisation scheme for H.263 video coder
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ELECTRONICS LETTERS 2000年 第17期36卷 1454-1456页
作者: Jia, ZK Cui, HJ Tang, K Tsing Hua Univ Dept Elect Engn State Key Lab Microwave & Digital Commun Beijing 100084 Peoples R China
The authors propose an efficient perceptual adaptive quantisation scheme that uses Q-N (quantisation step - number of output bits) mapping tables and fuzzy perceptual classifiers. Using this adaptive quantisation sche... 详细信息
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Picture complexity based rate allocation algorithm for transcoded video over ABR networks
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ELECTRONICS LETTERS 2000年 第6期36卷 521-522页
作者: Rosdiana, E Ghanbari, M Univ Essex Dept Elect Syst Engn Colchester CO4 3SQ Essex England
A novel method for distributing the available bandwidth among the contending ABR video sources is introduced. By allocating channel bandwidth to the sources based on the video complexity, it is possible to optimise th... 详细信息
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coding of arbitrarily shaped video objects based on SPIHT
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ELECTRONICS LETTERS 2000年 第13期36卷 1105-1106页
作者: Yuan, YF Chan, CW Nanyang Technol Univ Sch Elect & Elect Engn Informat Engn Div Singapore 639798 Singapore
A new coding algorithm is proposed for encoding arbitrarily shaped video objects. This algorithm employs an object-based discrete wavelet transform to decompose the video object. The decomposed pyramid is entropy enco... 详细信息
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image watermarking using Hadamard transforms
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ELECTRONICS LETTERS 2000年 第3期36卷 211-213页
作者: Falkowski, BJ Lim, LS Nanyang Technol Univ Singapore 639798 Singapore
A novel method based on the multi-resolution transform and complex Hadamard transform to embed watermarks in grey scale digital images is proposed. The results show that the presented scheme is robust to JPEG compress... 详细信息
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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... 详细信息
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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 classifica... 详细信息
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Wavelet based image adaptive watermarking scheme
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ELECTRONICS LETTERS 2000年 第4期36卷 312-313页
作者: Kaewkamnerd, N Rao, KR Univ Texas Dept Elect Engn Arlington TX 76019 USA
An image adaptive watermark casting method based on the wavelet transform is proposed. To increase the robustness and perceptual invisibility, the algorithm is combined with the quantisation model based on the human v... 详细信息
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Moving video object segmentation using statistical hypothesis testing
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ELECTRONICS LETTERS 2000年 第2期36卷 128-129页
作者: Kim, M Kim, J Elect & Telecommun Res Inst Yusong Gu Taejon 305350 South Korea
Object-based coding is one of the distinct features of the MPEG-4 standard. Hence, video object segmentation is an indispensable process for MPEG-4 coding. A method of localising moving objects for video object segmen... 详细信息
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Rate-optimised motion estimation
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ELECTRONICS LETTERS 2000年 第14期36卷 1196-1197页
作者: Choi, SY Chae, SI Shim, YS Commun Technol Ctr Inst Adv Engn Yongin 449860 Kyonggi Do South Korea Seoul Natl Univ Dept Elect Engn Seoul 151742 South Korea
The authors propose a motion estimation (ME) algorithm fcr determining a motion vector which minimises the estimated total number of bits allocated to the motion vector and to the residual discrete cosine transform co... 详细信息
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Moving object segmentation in DCT-based compressed video
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ELECTRONICS LETTERS 2000年 第21期36卷 1769-1770页
作者: Ji, S Park, HW Korea Adv Inst Sci & Technol Dept Elect Engn Yusong Gu Taejon 305701 South Korea
A block-based automatic segmentation algorithm has been developed for detecting and tracking moving objects in DCT-based compressed video. The proposed algorithm segments moving objects with block resolution using the... 详细信息
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