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As the latest coding standard, High Efficiency Video Coding (HEVC) has an obvious advantage in coding efficiency. Compared to H.264 Advanced Video Coding (H.264/AVC), HEVC can achieve about 50% bitrate reduction at the same subjective video quality. However, the enhancement in compression efficiency has been achieved at the cost of large increase in computational complexity. In this paper, to reduce...
In High Efficiency Video Coding (HEVC), the computational complexity has been increased so that an Early SKIP mode decision method is proposed by using coded block flag of an inter prediction unit (PU) to speed up mode decision with BD-bitrate increase. In this paper, we propose a fast SKIP mode decision algorithm to speed up PU mode decision for HEVC in a rate-distortion (RD) optimization sense....
In cloud-based video gaming systems, game engines are hosted in the cloud, and rendered gaming scenes are streamed to players over the Internet. In such systems, the tasks of rendering graphics and video encoding impose huge computational complexity on cloud servers. Therefore, speeding up the encoding process to meet the stringent requirements of the game becomes a critical issue in cloud-based video...
H.265/HEVC aims to provide significant improvement of compression performance compared with previous coding standards at cost of significant computation complexity. In this paper, an adaptive CU mode decision mechanism (ACMD) based on Bayesian decision theory is proposed to accelerate mode selection procedure. Specifically, the homogeneous determination is firstly utilized to filter out non-split...
In this paper, selective CU depth range decision algorithm is proposed to achieve a fast High Efficiency Video Coding (HEVC) encoding. According to HEVC standard, encoding and decoding operation is performed using Coding Tree Unit (CTU). These CTUs are further divided in quadtree structure to form Coding Units (CUs) and its perform recursive splitting into four blocks. To reduce unnecessary CU splitting...
The latest video coding standard H.264/AVC achieves better video compression rates since it adopts many new features. The improvement in compression efficiency of H.264 has brought about the dramatic increase in computational complexity. In this paper an algorithm for DC mode prediction employing a new mathematical expression has been developed and analyzed computational complexity against existing...
High Efficiency Video Coding (HEVC) is the latest video coding standard. It aims to provide significant improvement of compression performance with considerable increment of computational complexity, compared with all exiting video coding standards. In this paper, we propose an adaptive CU depth selection mechanism (ACDSM) for inter mode decision. To avoid unnecessary CU partition by rate distortion...
This paper presents a novel encoding algorithm for QC-LDPC codes constructed from Reed-Solomon codes. The encoding is performed in the transform domain via Galois Fourier transformation. Message bits are encoded in sections corresponding to sub-matrices of the parity-check matrix in the transform domain. Because of the structure of the parity-check matrices of these LDPC codes, the encoding can be...
The High Efficiency Video Coding (HEVC) standard provides a large improvement in terms of compression efficiency in comparison to its predecessors, mainly due to the introduction of new coding tools and more flexible data structures. However, since much more options are tested in a Rate-Distortion (R-D) optimization scheme, such improvement is accompanied by a significant increase in the encoding...
Sub-pixel motion estimation is used in most modern video coding schemes to improve the outcomes of motion estimation. The reference frame is interpolated and motion vectors are refined with fractional components to reduce the prediction error. Due to the high complexity of these steps, sub-pixel motion estimation can be very demanding in terms of encoding time and resources. A method to reduce complexity...
The High Efficiency Video Coding standard shows improved compression efficiency in comparison to previous standards at the cost of higher computational complexity. In this paper, a complexity control method for HEVC encoders based on the dynamic adjustment of the number of constrained coding treeblocks is proposed. The method limits the maximum tree depth used in the coding structures based on spatio-temporal...
Adaptive modulation and coding (AMC) is commonly used in wireless systems to dynamically change the modulation and coding schemes (MCSs) in subsequent frames such that the spectral efficiency can be adapted to various channel conditions. The spectrum and energy efficiency would decrease if the adopted MCS option at the transmitter needs to be dynamically transmitted to the receiver through a secure...
The High Efficiency Video Coding standard shows improved compression efficiency in comparison to previous standards at the cost of higher computational complexity. In this paper, a complexity scalability method for HEVC encoders based on the dynamic adjustment of the number of constrained coding treeblocks is proposed. The method limits the Prediction Unit shapes and the maximum tree depth used in...
For the High Efficiency Video Coding (HEVC) standard, a fast transform unit (TU) decision method is proposed. HEVC defines the TU representing a region sharing the same transformation, and it supports various transform sizes from 4×4 to 32×32 by using a quadtree of TUs. The various sizes of TUs can provide good coding efficiency, whereas it may increase dramatically encoding complexity. Assuming that...
Non-binary LDPC codes are flourishing in many areas for their excellent error correction performance in last decade. However, the bottleneck for NB-LDPC codes' implementation is the high decoding computational complexity. To seek for a low-complexity decoding algorithm, iterative double-reliability-based majority-logic decoding (IDRB-MLGD) algorithm has been proposed, which still suffers from relatively...
The new High Efficiency Video Coding (HEVC) standard is achieving higher encoding efficiency when compared to its predecessors such as H.264/AVC. One of the factors responsible to this improvement is the intra prediction method, which introduces a larger number of prediction directions resulting in an enhanced rate-distortion (RD) performance at the cost of a higher computational complexity. This...
This paper presents a fast mode decision algorithm for the HEVC intra prediction. A new evaluation order in the Coding Tree Block (CTB) allows the use of modes from low level PUs to be used as reference to the current PU decision. In this paper we use this idea to develop a fast intra mode decision algorithm that can be configured to run in two different complexity modes, relaxed and aggressive. Experimental...
The wear-out of flash-based Solid-State Drives (SSDs) is a main concern that significantly affects their reliability. One major parameter that accelerates SSD wear-out is the number of write-cycles committed to flash chips. The number of write-cycles in SSD-based disk subsystem is highly dependent on the erasure code implemented in Redundant Array of Independent Disks (RAIDs). In this paper, we investigate...
The emerging HEVC standard introduces a number of tools which increase compression efficiency in comparison to its predecessors at the cost of greater computational complexity. This paper proposes a complexity control method for HEVC encoders based on dynamic adjustment of the newly proposed coding tree structures. The method improves a previous solution by adopting a strategy that takes into consideration...
This paper presents a novel low-complexity encoding algorithm for binary quasi-cyclic (QC) codes based on matrix transformation. First, a message vector is encoded into a transformed codeword in the transform domain. Then, the transmitted codeword is obtained from the transformed codeword by the inverse Galois Fourier transform. Moreover, a simple and fast mapping is devised to post-process the transformed...
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