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Higher compression efficiency in HEVC encoders comes with increased computational complexity, making real time encoding of high resolution videos a challenging task. This challenge can be addressed by software, yet hardware solutions are more appealing due to their superior performance and low power consumption. This paper presents an FPGA based hardware implementation of an all intra HEVC encoder,...
Compressed sensing MRI (CS-MRI) and compressed sensing sensitivity encoding (CS-SENSE) only include two regularization items, total variation (TV) and Wavelet, which leads to artifacts remaindering in 1-D random sampling. In order to improve the performance of them, a new regularization item-Contourlet is introduced to constrain the solution with the other two regularization items together. The solution...
Decorrelator is a module to restore the specific correlation properties between stereo signals in parametric stereo audio decoder, which is vital to keep the spatial information of the stereo signals. Generally, the existing decorrelators are prone to have a comb-filter effect which results in an undesirable “metallic” sound and produce temporal smearing such as pre- and post-echoes artefacts. This...
A networked controlled system (NCS) in which the plant communicates to the controller over a channel with random delay loss is considered. The channel model is motivated by recent development of tree codes for NCS, which effectively translates an erasure channel to one with random delay. A causal transform coding scheme is presented which exploits the plant state memory for efficient communications...
In this paper, we propose a low latency fast Hadamard transform (FHT) based decoder for polar codes. We show that while this decoder can achieve the same performance as the popular successive cancellation (SC) decoder, it is superior to the SC decoder in terms of latency. The proposed FHT decoder can be applied directly to most short Polar codes, but requires a modest level of encoder modification...
The rising demand for media consumption via mobile devices and the emergence of complex video coding algorithms present an additional challenge for the energy management algorithms in resource-constrained consumer electronic devices. Thus, generating energy-optimized video bit streams will positively contribute towards overcoming this challenge. This paper introduces a novel energy model for intra-frame...
Due to advance growth in videos available across the internet, it is required to navigate and handle them properly. It is essential to select only valuable and accurate information from video. Video summarization helps in acquiring essential information. Video summary produces concise and exact data of the video. With help of key frame extraction video summary can be generated. Key frames from video...
In this work, three encryption techniques are proposed by manipulating the bin (binary symbol) of significant values, transform skip signals and suffixes in selected CTU (coding tree unit) of video slices under the HEVC standard. These techniques are applied with minimal parsing overhead during encoding and decoding processes. Experiment results show that the selected region can be sufficiently encrypted.
State-of-the-art video coding standards adopt large block and transform sizes. Moreover, as resolutions keep growing, there is a trend in adopting even larger structures in future video encoders, resulting in higher complexity. Therefore, the design of energy-efficient architectures for variable block size distortion metrics are key to keep the energy requirements of battery devices under a reasonable...
The image down-conversion may be used in the block-based image compression because it can help save lots of bit-counts for each individual block. A straightforward way to implement the transform domain down-conversion is to truncate some high-frequency components to get a down-sized coefficient block. However, directly using this down-sized coefficient block to reconstruct a completed image block...
Intra picture coding using HEVC is very efficient and is applied to video as well as single image compression. However, the cost for this high compression efficiency is the complexity caused by the high number of 35 available coding modes. Existing methods for fast mode decision estimate the mode costs based on the prediction error samples. This paper proposes a smart method to exclude the 33 angular...
Screen contents have various characteristics features different from the natural images captured by cameras. These characteristic features have important effects on the video coding performance of motion estimation approaches. In this work, we carry out performance comparison of some low bit-depth based motion estimation approaches and evaluate performance of methods based on the characteristic features...
In this information age, a efficient video encoding/decoding technology will help reducing information redundancy, delaying processing, enhancing the robustness, improving visual perception of quality, increasing the compression ratio, etc. At first, this article describes the history of video encoding/decoding standards development. Research on the key technologies of H.264 coding standard currently...
A new video coding algorithm using 3D transform is introduced. The algorithm does not use motion compensation. Two novel parts of the algorithm are: (1) The 4-channel SCWP is used for the time-dimension transform, and (2) A novel run-length coding method is developed for coding the quantized transform coefficients. Principally, the complexity of the proposed transform video coding algorithm is of...
In this recent world, almost everything is getting digitized rapidly. A text based video retrieval system is degrading the performance with respect to user's perception these days. So it's time to move on to the content based retrieval approach to a video. The effective implementation of this system can be done by revision of the content based video retrieval style. Content Based Video Retrieval (CBVR)...
This paper presents a new segmentation-based compression scheme for 3D dynamic models. The segmentation process is preformed based on the heat diffusion properties, while exploiting temporal and spatial dependencies of the geometry component. 3D affine transforms are used to describe the motion clusters. Weighting of these affine transforms allows to faithfully determine the vertex motions in each...
The Thor video codec is being developed by Cisco with the intention to use only royalty-free coding tools. The video codec is based on the well-known block-based hybrid video coding approach, but with some significant changes compared to existing standards such as AVC/H.264 and HEVC/H.265. These changes include transform coefficient coding, deblocking filter, a separate deringing filter, and interpolated...
Compressive Sensing is the present sampling paradigm which acquires only useful data, and hence reduces the acquisition time, eliminates the necessity of fast analog to digital converters and data compression stage, prior to transmission. Challenge lies in recovering the data from these few samples, which are far below Nyquist rate. Compressive sensing accomplishes this, provided the signal is sparse...
Telecardiology includes variety of applications and is one of the fastest-growing fields in telemedicine. In telecardiology the amount of recorded ECG data is very much high, hence the necessity of efficient data compression methods for biomedical signals is currently widely recognized. In this paper improved version of existing ASCII character encoding ECG data compression method is proposed. The...
Distributed Video Coding (DVC) is a video coding archetype that explores the source statistics at the decoder and hence reducing the encoder complexity. The Rate-Distortion (RD) performance of DVC strongly depends on the quality of the side information (SI) generation. So, efficient techniques to generate reliable SI are therefore essential to obtain a better quality of decoded video. In this paper,...
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