To minimize Rate-Distortion (RD) cost in video coding, RD Optimization (RDO) technique is adopted, which also brings increasingly computational complexity in Motion Estimation (ME), multiple reference selection and mode decision. In this paper, a Gaussian model based adaptive RD cost prediction method is developed to jointly speed up multiple reference selection and inter-mode decision. Besides...

The H.264/AVC video coding standard aims to enable significantly improved compression performance compared to all existing video coding standards. In order to achieve this, a robust rate-distortion optimization (RDO) technique is employed to select best coding mode. This paper presents combined (intra and inter prediction) fast mode decision algorithm for H.264/AVC. The objective is to reduce t...

The emerging H.264/AVC video coding standard improves coding performance significantly by adopting many advanced techniques. This is achieved at the expense of great increase of encoder complexity. Specifically, the intra prediction using RDO examines all possible combinations of coding modes, which depend on spatial directional correlation with adjacent blocks. There are 9 modes for a 4×4 luma...

This paper proposes an adaptive frame layer rate control scheme for H.264 by introducing a linear model to predict the mean absolute difference (MAD) of current frame by that of previous one. The target bit rate for each frame is computed by adopting a fluid flow traffic model and linear tracking theory. The corresponding quantization parameter is computed by using a quadratic rate– distortion ...

HEVC (High Efficiency Video Coding) is the next-generation video coding standard, which introduced many new technologies such as tree structure coding unit and a variety of intra prediction mode. Compared with H.264/AVC, HEVC has achieved higher coding efficiency but requires a very high computational complexity. So this paper proposes a fast algorithm through early termination of the CU (Codin...

DCT-based transforms are widely adopted for video compression. Recently, many authors have highlighted that prediction residuals usually have directional structures that cannot be efficiently represented by conventional Discrete Cosine Transform (DCT). Although directional transforms have superior performance over the conventional DCT, for application in video compression it is necessary to eva...

The H.264/AVC video coding standard uses in intraprediction, 9 directional modes for 4 × 4 and 8 × 8 luma blocks, and 4 directional modes for 16× 16 luma macroblocks, and 8 × 8 chroma blocks. The use of the variable block size and multiple modes in intraprediction makes the intracoding of H.264/AVC very efficient compared with other compression standards; however, computational complexity is in...

Tradeoff between different resources (bitrate, computational time, etc.) and compression quality, often referred to as rate-distortion optimization (RDO), is a key problem in video coding. With a little exaggeration, it can be claimed that what distinguishes between a good and a bad codec is how optimally it finds such a tradeoff. This is the second part of our paper presenting an algorithm for...

Este trabalho descreve o estudo voltamétrico de três aldeídos alifáticos: formaldeído, acetaldeído e propionaldeído sobre ânodos do tipo Dimensionalmente Estáveis (ADE). Eletrodos com composição Ti/Ru 0.3 M 0.7 O 2 (onde M = Ti ou Sn) foram utilizados em solução de 0.5 mol dm H 2 SO 4 usando uma célula do tipo filtro-prensa. Ambos os eletrodos apresentam um comportamento típico dos ADE frente...

This poster will present the completeness of coverage of rare disease names in standard coding systems, including the International Classification of Diseases (ICD) and SNOMED CT, and ontologies such as the Orphanet Rare Diseases Ontology (RDO). Using use cases and a set of 45 rare diseases for the national Patient Centered Outcomes Research Network (PCORnet), the poster will describe the curre...