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.
HEVC (High Efficiency Video Coding) achieves cutting edge encoding efficiency and outperforms previous standards, such as the H.264/AVC. One of the key contributions to the improvement is the intra-frame coding that employs abundant coding unit (CU) sizes. However finding the optimal CU size is computationally expensive. To alleviate the intra encoding complexity and facilitate the real-time implementation,...
This paper proposes a novel colorization-based color image coding method. This method segments an input image into small segments called superpixels and restores the chrominance of each superpixel as the linear transformation of its luminance. A lot of color image coding methods using colorization have been proposed, but no methods utilize a local correlation between the luminance component and the...
x265 is an open-source HEVC encoder which utilizes many optimization techniques and thus has fast coding speed as well as excellent coding performance. As a key technique in HEVC, sample adaptive offset (SAO) is also adopted by x265 to reduce the distortion between reconstructed frames and original ones. Although x265 is implemented in parallel with many speed up techniques, less efforts have been...
Adaptive video streaming has become prominent due to the rising diversity of Web-enabled personal devices. Common limitations in bandwidth and decoding power challenge the efficiency of content encoders to preserve visual quality at reduced data rates over a wide range of display resolutions. Objective assessment of perceptual video quality has greatly improved in the past decade but remains an open...
Transform skip modes (TSM) have previously been proposed for HEVC, where a transform on the prediction residual is skipped in one or both directions. TSM can improve coding efficiency when the prediction errors have minimal correlation in one or both directions. In this paper, improvements are proposed to the 1D transform skip mode design. Specifically, a unified dynamic range control method is proposed...
High Efficiency Video Coding (HEVC) could not provide real time facilities to the limited processing and battery powered electronic devices as its encoding time complexity increases multiple times compared to its predecessor. Numerous researchers contribute to address this limitation by reducing a number of motion estimation (ME) modes where they analyze homogeneity, residual and statistical correlation...
In this paper, we propose a Fast Locality-constrained low-rank sparse coding for image classification. The low-rank coding seeks the homogeneousness and correlation of local features, encodes jointly and globally, based on the traditional low-rank coding, we incorporate locality constraints to enforce the local features sharing the same representation. Considering that the traditional low-rank coding...
According to the group, interactive and real-time characteristics of mobile social environment, a novel user behavior prediction algorithm in mobile social environment is proposed in this paper. In this algorithm, firstly, a coding based two-dimensional Apriori method is presented to analyze user service behaviors: on one hand, the correlation analysis of a user behavior history is performed; on the...
We study the problem of multi-class image classification with large number of classes, of which the one-vs-all based approach is prohibitive in practical applications. Recent state-of-the-art approaches rely on label tree to reduce classification complexity. However, building optimal tree structures and learning precise classifiers to optimize tree loss is challenging. In this paper, we introduce...
Content providers create different versions of a video to accommodate different end-user devices and network conditions. However, each of these versions requires a resource intensive encoding process. To reduce the computational complexity of the encodings, this paper proposes a fast simultaneous encoder. This encoder takes a single video as input and creates a number of bit streams encoded with different...
It is known that, as opposed to point-to-point channel, separate source and channel coding is not optimal in general for sending correlated sources over multiuser channels. In some works joint source-channel coding has been investigated for some certain multiuser channels, e.g., multiple access channel (MAC) and broadcast channel (BC). In this paper, we obtain a sufficient condition for transmitting...
In order to transmit the signals by multirays connection channels the method of Orthogonal Frequency Division Multiplexing — OFDM is used. The main advantages of this technology are high resistance concerning selective fades and high frequency effectiveness. While constructing radio connection systems (RCS) with OFDM great attention is paid to the questions of creation the signal and code constructions...
Many SAW RFID applications require the ability to read multiple tags located in close proximity, thus a structure of SAW tags based on CIDT is proposed to solve the “anti-collision” problem. Based on finite element analysis, the research of the CIDT-based anti-collision SAW tags is carried out by utilizing software COMSOL multiphysics. Primarily, the anti-collision unit of the SAW tags is studied...
SATD (Sum of Absolute Transformed Difference) based cost function is adopted to reduce the complexity of HEVC (High Efficiency video coding) codec by selecting up to 8 intra modes for RDO (Rate Distortion Optimization) process. However, transform of all 35 modes, and RDO of 8 modes is bottleneck in intra mode complexity reduction. In this paper, a hybrid approach for reducing intra coding complexity...
High Efficiency Video Coding (HEVC) standard employs Coding Tree Unit (CTU) quadtree partition technology to improve the compression efficiency significantly, but it also consumes an enormous encoding computational complexity. In this paper, a fast CTU depth prediction algorithm is proposed. First, the spatio-temporal correlation of CTU depths among the current CTU, the spatial neighbor CTUs, and...
In this paper, we propose a frequency coding waveform with segment linear frequency modulation (LFM) signal for the multiple-input multiple-output (MIMO) radar. This new waveform is modified from the discrete frequency coding waveform with LFM (DFC-LFM) by changing the subpulse from the LFM signal to segment LFM and extending the contiguous waveform to a pulse train. Compared to the existing frequency...
In this paper, we show that for the two-user Gaussian broadcast channel with correlated noises and perfect feedback the largest region that can be achieved by linear-feedback schemes equals the largest region that can be achieved over a dual multi-access channel when in this latter the channel inputs are subject to a “non-standard” sum-power constraint that depends on the BC-noise correlation. Combining...
In this paper, we propose a method that skips the complex encoding processes of coding unit (CU) for HEVC intra frame coding. To speed-up the encoding process that recursively explore all sizes of CUs, most researchers have exploited spatial information thus far. On the other hand, the temporal correlation among frames has not been thoroughly investigated. We exploited the temporal correlation as...
Transform Domain Communication System (TDCS) has been proposed as a new candidate applied in the cognitive radio (CR) environment since it can avoid existing users or jammers intelligently over a given bandwidth. The TDCS achieves noise-like property and orthogonality characteristic by generating a PR phase vector through a random phase coding processing. In this paper, a new implementation of TDCS...
A neural field model with topographic feedforward and feedback is chosen to confirm how correlated activity in spiking neural networks depends on spatial couplings. Numerical simulations reveal that the intensity of the correlated firing is suppressed as the feedback spatial scale decreases. Afterwards, as the feedback becomes topographic, the correlation coefficient is almost unchanged with further...
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.