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.
In this paper, we propose an improved low complexity algorithm for the scalable extension of the HEVC (SHVC) using the information of Rate-Distortion cost and the coding unit (CU) size in the base layer. The proposed algorithm is used for inter layer reference prediction (ILRP) which is defined as a new mode in SHVC. Firstly, the relationship between of the different resolutions is evaluated when...
MV-HEVC is a 3D extension of the High Efficiency Video Coding (HEVC) standard, which is developed to improve the coding efficiency of multi-view video. However, this improved efficiency leads to greater computational complexity. Recently, how to reduce the encoding time for multi-view coding is becoming a hot issue in real-time applications. In this paper, a fast coding unit (CU) decision algorithm...
We propose a technique for optimizing the High Efficiency Video Coding (HEVC) encoder by reducing the number of operations performed in the motion estimation stage. The technique is based on the fact that a significant number of motion estimation operations are performed repetitively for the same image samples, but for different block partition sizes. By decoupling the initial motion estimation and...
In High Efficiency Video Coding (HEVC), SKIP mode is an efficient inter prediction tool with high coding performance but low complexity. In this paper, an early SKIP mode decision algorithm is proposed to accelerate the encoding process. The rate-distortion cost (RD-cost) of SKIP mode is used as the decision criterion. A nonparametric density estimation scheme is employed to partition the SKIP RD-cost...
This paper proposes a dictionary-based L1-norm sparse coding for time series prediction which requires no training phase, and minimal parameter tuning, making it suitable for nonstationary and online prediction applications. The prediction process is formulated as a basis pursuit L1-norm problem, where a sparse set of weights is estimated for each test vector. Constrained sparse coding formulations...
As a fast search algorithm for motion estimation, the unsymmetrical-cross multi-hexagon-grid Search (UMHexagonS) is widely used in H.264. However, the research found that there were some shortages in this algorithm, such as the computational complexity. Based on this, we improve the UMHexagonS algorithm to reduce the computation. By partitioning the search range, we can only search the prediction...
Rate control is very crucial for scalable video applications as it controls encoding bitrates so as to meet channel bandwidths while obtaining optimum encoding quality. In this paper, we proposed a new inter-layer rate control algorithm for H.264/SVC. One unique feature is that an effective switched model is proposed to predict the bit estimation used for encoding inter frames either from the previous...
The latest video coding standard High Efficiency Video Coding (HEVC) is developed by Joint Collaborative Team on Video Coding(JCTVC). HEVC can achieve better compression performance than any other coding standards, which adopts the quadtree structured coding tree unit (CTU). In encoding process, the CTU is recursively split into four equally sized coding unit (CU)s. Along with the multiple sizes of...
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...
H.265/HEVC adopts lots of newest video coding techniques to achieve significant increment of coding efficiency compare with H.264/AVC. One of the new techniques is flexible coding unit partition, which also brings huge of computational complexity. In this paper, we propose a fast coding unit (CU) coding mode decision algorithm for HEVC. Experimental results show that the proposed algorithm can reduce...
Conformal prediction (CP) has received a signif-icant attention in the last decade due to its capability of pro-viding confidences for class predictions. However, the literature lacks of a computationally efficient implementation of CP for multi-class reduction techniques such as one-versus-all, ECOC etc. To address this issue we propose two implementations of CP for multi-class reduction: Conformal...
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...
In HEVC coding standard, the encoder employs a quad-tree-based Coding Unit (CU) structure to adapt to various texture characteristics of images. Although it provides better compression performance, the computation load increases drastically. In this paper, a two-stage fast CU size decision method is proposed for HEVC intra coding. In the first stage, we utilize the combination of the weighted variance...
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...
The discovery of RNA interference (RNAi) leads to design novel drugs for different diseases. Selecting short interfering RNAs (siRNAs) that can knockdown target genes efficiently is one of the key tasks in studying RNAi. A number of predictive models have been proposed to predict knockdown efficacy of siRNAs, however, their performance is still far from the expectation. This work aims to develop a...
In the intra coding of HEVC/H.265, the computational complexity of intra mode decision is very high because up to 35 intra prediction modes are supported. Though a fast intra mode decision based on rough mode decision (RMD) is adopted in reference software HM12.0, only a fixed number of intra modes are selected for rate distortion optimization (RDO). In this paper, an adaptive fast intra mode decision...
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...
By introducing novel algorithms in the emerging high efficiency video coding (HEVC) standard average bitrate savings of 23% have been achieved in comparison to the H.264/AVC high profile reference encoder for the all intra configuration at the cost of an additional complexity increase. This high algorithmic complexity requires the development and integration of innovative approaches, like different...
The new generation standard of video coding, High Efficiency Video Coding (HEVC) achieves better compression performance at the same image quality compared with H.264/AVC. Quad-tree based flexible coding unit structure defines the prediction unit sizes up to 64×64. Plenty of intra prediction modes are employed to achieve better coding efficiency. However, these bring massive calculation and may not...
In this paper, an adaptive weighted prediction is proposed to improve the coding efficiency. Conventional weighted prediction methods are optimized for specific sequences with global brightness variations (GBVs) such as fade-in and fade-out. However, if there is uncovered background by motion between current picture and reference picture, weighted prediction parameter (WPP) could not be derived accurately...
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.