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Encoder and decoder implementations of the High Efficiency Video Coding (HEVC) standard have been subject to many optimization approaches since the release in 2013. However, the real-time decoding of high quality and ultra high resolution videos is still a very challenging task. Especially entropy decoding (CABAC) is most often the throughput bottleneck for very high bitrates. Syntax Element Partitioning...
Scalable High efficiency Video Coding (SHVC) is the scalable extension of the latest video coding standard High Efficiency Video Coding (HEVC). One of the key novelties introduced by SHVC is that it enables hybrid codec scalability. This basically means that the video layers can be encoded with different video standards providing backward compatibility between codecs. In this paper, we propose a software...
Spatially coupled low-density parity-check (SC-LDPC) codes are sparse graph codes that have recently become of interest due to their capacity-approaching performance on memoryless binary input channels. Moreover, protograph SC-LDPC codes have been shown to be asymptotically good under certain conditions. SC-LDPC codes are amenable to a windowed decoder that allows decoding of blocks of bits to be...
This paper presents an energy evaluation of the HEVC decoding process considering different encoding configurations in order to provide support for efficient encoding-for-decoding solutions. The analysis evaluates the energy impact of changing the configuration of four encoding tools in the HEVC decoding process. A set of six different configurations are used to encode/decode video sequences in order...
The vocabulary is a vital component of automatic speech recognition(ASR) systems. For a specific Chinese speech recognition task, using a large general vocabulary not only leads to a much longer time to decode, but also hurts the recognition accuracy. In this paper, we proposed an unsupervised algorithm to select task-specific words from a large general vocabulary. The out-of-vocabulary(OOV) rate...
In this paper we propose a framework for building a full-fledged acoustic unit recognizer in a zero resource setting, i.e., without any provided labels. For that, we combine an iterative Dirichlet process Gaussian mixture model (DPGMM) clustering framework with a standard pipeline for supervised GMM-HMM acoustic model (AM) and n-gram language model (LM) training, enhanced by a scheme for iterative...
A video analyzer is a comprehensive bitstream analysis tool which accelerates development and debugging of video bitstreams while ensuring compliance with industry standards. There are many conventional analyzers present for different video standards like H.264, HEVC which are compliant only with the respective video sequence format. In this work, a generalized analyzer with integrated encoder is...
We propose a non-linear extension to factor analysis with beta process priors for improved data representation ability. This non-linear Beta Process Factor Analysis (nBPFA) allows data to be represented as a non-linear transformation of a standard sparse factor decomposition. We develop a scalable variational inference framework, which builds upon the ideas of the variational auto-encoder, by allowing...
All multimedia devices now incorporate video CODECs that comply with international video coding standards such as H.264 / MPEG4-AVC and the new High Efficiency Video Coding Standard (HEVC) otherwise known as H.265. Although the standard CODECs have been designed to include algorithms with optimal efficiency, large number of coding parameters that can be used to fine tune their operation, within known...
This work presents a comparison of two implementations of the last software version of The High Efficiency Video Coding (HEVC) decoder in a single low cost processor ARM Cortex-A series using NEON architecture which is a Single Input Multiple Data (SIMD). By using this technology of optimization, the whole execution time is reduced up to x4. We have analyzed separately all the blocks in the decoder...
Polar codes are a new class of block codes with an explicit construction that provably achieve the capacity of various communications channels, even with the low-complexity successive-cancellation (SC) decoding algorithm. Yet, the more complex successive-cancellation list (SCL) decoding algorithm is gathering more attention lately as it significantly improves the error-correction performance of short-to...
High Dynamic Range (HDR) videos are commonly compressed using existing Low Dynamic Range (LDR) coding standards. This necessarily implies a Tone Mapping (TM) stage which aims at reducing the input video range while preserving the most significant scene details. In most cases, a residual sequence is encoded and used at the decoder side to recover the HDR content. The challenge is to efficiently encode...
In this paper, we propose a new approach to construct quasi-cyclic low-density parity-check (QC-LDPC) codes using Hamming codewords of weight three, namely the HM-QC-LDPC codes. Thanks to the distance property of Hamming codes, length four cycles are avoided from the Tanner graph of the constructed codes, resulting in codes of girth six. This approach can be further extended to construct QC-LDPC codes...
With the development of flash technology, multilevel per cell (MLC) NAND flash memory has mastered the key market because of its storage capacity superiority. However, excessive density increment leads to decay of reliability of MLC NAND flash memory, thus an appropriate error correction code (ECC) is required to address this issue. This paper presents an efficient multi-strategy ECC scheme called...
Semi-custom design flow is an efficient way to design digital integrated circuit (IC). It realizes physical IC design through translating hardware description languages (HDL) into a GDS layout file. By running scripts, the HDL code is synthesized into a cell level schematic. Then, the placing and routing procedures are performed, violations are fixed, optimizations are achieved, and verifications...
One challenge in a video surveillance system is the data rate required to represent digital video. Accordingly, the use of lossy video compression at a compression ratio of 100:1, or higher, is an essential part of any distributed live video system. The ensuing distortion can interfere with the goals of surveillance by confounding both human analysis and computer vision based processing. This paper...
High efficiency Video Coding (HEVC) uses advanced compression techniques that H.264/AVC don't use. These algorithmic techniques achieve about 50 percent of average bit-rate reduction compared to H.264/AVC. In this paper, we present the low complexity HEVC decoder structure suitable for our HEVC encoder. The proposed slim - HEVC decoder is compliant with HM 10.0 which is developed during standardization...
Turbo codes are well known error-correcting codes used in many communication standards. However, they suffer from error floors. Recently, a method - denoted as the flip and check algorithm - that lowers the error floor of turbo codes was proposed. This method relies on the identification of the least reliable bits during the turbo decoding process. Gains of about one order of magnitude were reached...
LDPC code is a powerful error correcting code used in many communication systems. Efficient decoding algorithm and hardware implementation of LDPC code is an important issue. The paper proposes an improved version of the Normalized Min-Sum (NMS) decoding algorithm named “Girth-Aware NMS”. The principle of the GA-NMS is to determine “offline” the optimal normalisation factor of the extrinsic message...
A lower power and area efficient VP9 and multi-standard video decoder chip is first-reported for Android 4K TV. It supports prevalent MPEG-x, VP-x, RMx, WMV-x and H.26x series video standards in a single chip. Three high-throughput techniques, look-ahead re-mapping, early stage pipeline and dynamic-scheduled bus translation, are proposed. They cuts the processing times by 51.2% compared to the state-of-the-art...
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