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In HEVC coding standard, the encoder employs a quad-tree-based Coding Unit (CU) structure to adapt to various texture characteristics of images. Although it provides better compression performance, the computation load increases drastically. In this paper, a two-stage fast CU size decision method is proposed for HEVC intra coding. In the first stage, we utilize the combination of the weighted variance...
We propose a general N-channel MDC (Multiple Description Coding) framework which can integrate the advantages of various low-dimensional MDC schemes. Given the operational rate-distortion functions of low-dimensional codecs, we show how to optimize the proposed MDC framework. We prove that the optimization problem can be reduced to a combinatorial problem which in certain cases admits solutions. We...
Watermark string detection is very useful for document security protection. In we proposed an image based document watermark detection system. In this paper, two major modifications are made based on the previous system.First, a trinary image mosaicing algorithm is proposed to merge the broken watermark string images into a high quality mosaic image. Second, we relax the conditions in the Maximum...
To improve coding performance, the new video compression standard H.264 employs seven variable block sizes for one Macro Block (MB) to conduct motion estimation and compensation. MPEG-2 only has one size 16times16. This paper presents a novel fast variable block size selection method for an inter-MB in a video transcoder from MPEG-2 to H.264 with downscaling by a factor two in each dimension based...
Genetic arithmetic can search whole best key of question. In this paper, it is applied to choose network initial weight value, then make use of back propagation arithmetic to search optimization weights, and design a multiplayer neural network based on genetic arithmetic. This paper introduces the structure of genetic neural network, imposes the entropy error function to speed up the learning rate,...
In this paper, a rate-distortion optimized trellis-coded quantization (RDOTCQ) algorithm is presented. Based on rate-distortion criterion, the proposed algorithm improves coding efficiency by adaptively optimizing quantization levels of small signals. In addition, it has no overhead and is fully compatible with the standard decoder. The proposed algorithm can be applied to any TCQ-based systems. In...
Ringing artifacts occur near large edges in reconstructed low bit-rate JPEG2000 images due to the wavelet-based compression techniques. In this paper, an embedded ringing artifacts reduction scheme for low bit-rate JPEG2000 images is proposed. We adopt a local adaptive estimation for the coefficients in spatial domain and LL wavelet subband at each decomposition level before the inverse discrete wavelet...
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