The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Wheezes are abnormal continuous adventitious lung sounds that are strongly related to patients with obstructive airways diseases. Wireless telemonitoring of these sounds facilitate early diagnosis (short, long term) and management of chronic inflammatory disease of the airways (e.g., asthma) through the use of an accurate and energy efficient mhealth system. Therefore, low complexity breath compression...
A new generation video coding standard developed by IEEE 1857 working group will be published as IEEE 1857.4, which assumes the work on the first generation of IEEE 1857 video coding standard IEEE std. 1857-2013(IEEE 1857.1) and targets to double the coding efficiency of IEEE std. 1857-2013. This paper provides an overview of the forthcoming IEEE 1857.4 video coding standard, including the background...
H.265/High Efficiency Video Coding (HEVC), the latest video coding standard developed jointly by ITU-T and by ISO/IEC in the joint collaborative team on video coding (JCT-VC), has shown significant objective compression improvements over the last video coding standard H.264/AVC. After the establishment of H.265/HEVC, more and more attention has been paid on how to further improve the visual quality...
The latest video coding standard HEVC has the potential to rapidly conquer many areas of video compression due to the significant boost in coding efficiency compared to its predecessor. Unfortunately there is the drawback that this gain in efficiency comes at the expense of complexity. Encoders have to select the best possible coding mode from a huge set of available modes offered by the standard...
This paper investigates a fast transform skip mode decision method which can reduce residual coding complexity of a transform skip tool for SCC (Screen Content Coding) extension of HEVC (High Efficiency Video Coding). Noticing the high tendency of transform skip mode occurring in 4×4 transform blocks in a coding unit (CU) coded as the intra block copy, the proposed fast method is designed to select...
This paper presents a new block-based coding method for HEVC intra coding. Pixels in each prediction block are divided into two parts: half pixels are coded by a smart padding technique together with a constrained quantization algorithm; whereas the other half are reconstructed by simple linear interpolations along the prediction direction utilizing the neighboring reference pixels and the first half...
This paper proposes an FPGA architecture for the 1-D forward integer transform of the High Efficiency Video Coding (HEVC), which is the latest video coding standard. The work presents a novel technique which makes the architecture able to compute transform of flexible input combinations. The architecture can support all transform sizes i.e. 4×4, 8×8, 16×16, and 32×32, and all possible input combinations...
Broadcast providers are looking for new opportunities to increase user experience and user interaction on their content. Their main goal is to attract and preserve viewer attention to create a big and stable audience. This could be achieved with a second screen application that lets the users select their own viewpoint in an extremely high resolution video to direct their own first screen. By allowing...
Digital video is widely used in the mobile applications, where video compression technology is necessary to store or transmit the videos. High Efficiency Video Coding (HEVC) achieves the highest compression ratio while it costs huge computational complexity, in which rate-distortion (RD) cost calculation takes the majority. This paper presents a low-complexity RD estimation method for HEVC intra prediction...
Polar coding schemes are developed for the decode-forward relaying (digital-to-digital interface) and the compress-forward relaying (analog-to-digital interface) in the three-node relay channel. For decode-forward, a technique based on the recent universal polarization method is applied to create the desired nested structure. For compress-forward, existing methods are generalized to allow arbitrary...
Consider the problem of reliable multicast over a network in the presence of adversarial errors. In contrast to traditional network error correction codes designed for a given network capacity and a given number of errors, we study an arguably more realistic setting that prior knowledge on the network and adversary parameters is not available. For this setting we propose efficient and throughput-optimal...
We investigate the joint application of compressive sensing and network coding to the problem of energy efficient data gathering in wireless sensor networks. We consider the problem of optimally constructing forwarding trees to carry compressed data to projection nodes; each compressed data refers to a weighted aggregation of measurements from sensors collected at one projection node. Projection nodes...
This paper presents a lossless double-precision floating point compression algorithm. Floating point compression can reduce the cost of storing and transmitting large amounts of data associated with big data problems. A previous algorithm called FPC performs well and uses predictors. However, predictors have limitations. Our program (fzip) overcomes some of these limitations, fzip has 2 phases, first...
Rate-Distortion Optimized Quantization (RDOQ) is an encoding optimization technique that may be modified with no implications to the bitstream compliance with the standard. In the paper, we propose an RDOQ variant with exact cost estimation resulting in higher compression ratios as compared to HEVC Test Model. This improvement is obtained at the cost of the complexity increase that may be scaled by...
Optical flow or dense motion field representations provide an alternative to block based schemes and are capable of describing smooth motion flows without introducing any artificial block boundaries. However dense motion fields have not been widely adopted for video coding applications principally due to the prohibitive cost of communicating such detailed motion representations. In this paper our...
High Efficiency Video Coding (HEVC) adopts hybrid transform coding scheme to improve the transform performance. However, it does not consider the influence of the prediction unit boundary. This paper proposes an adaptive boundary dependent transform optimization scheme for HEVC. Based on the transform unit boundary type identification by checking whether it lies at a prediction unit boundary or not,...
The High Efficiency Video Coding (HEVC) reference encoder includes a Uniform Reconstruction Quantization (URQ) method. This block level quantization technique does not take into account the importance of transform coefficients in terms of signal reconstruction. In this paper, we present a transform coefficient level quantization technique based on a soft thresholding approach, in which the quantization...
As the concept of block level adaptivity becomes an important feature in recent video CODECs, block level adaptive quantization (BLAQ) is being considered in the High Efficiency Video Coding (HEVC) standard. The BLAQ is based on the assumption that each block should have its own quantization parameter (QP), which can adapt to the local content of video sequences much better, and hence the video encoder...
This paper presents evolutionary multi-objective approaches to tune parameters in Trace transform for invariant feature construction. It is well-known that the Trace transform involves three functionals applied consecutively to the image to produce real numbers called Triple features representing the input image. Traditionally, these functionals are chosen empirically, and the image sampling parameters...
In this paper, we propose a macro-block (MB) level rate control algorithm for low delay H.264/AVC video communication based on the ρ domain rate model. In the proposed algorithm, an exponential model is used to characterize the relation between ρ and the quantization step (Qstep) at the MB level, with which the quantization parameter (QP) for a MB can be obtained. Furthermore, a switched QP calculation...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.