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Low-delay and error-resilience video coding are critical for real-time video communication over wireless networks. Intra-refresh coding, which embeds intra-coded regions into inter frames can achieve a relatively smooth bit-rate and terminate the error propagation caused by the transmission loss. In this paper, we proposed a novel linear model for the intra-refresh cycle size selection adapting to...
The new video coding standard, High Efficiency Video Coding (HEVC), was developed to replace H264/AVC and achieves high efficiency by introducing a new coding structure in adoption of coding unit (CU), prediction unit (PU) and transform unit (TU). However, it also imposes great computation burden on the mode decision of encoders. In this paper, a conceptual HEVC encoder architecture with cascaded...
In this paper, two compression mechanisms based on 3D-Discrete Wavelet Transform (DWT) and 2D Embedded Zero Wavelet (EZW) are compared depending on the mathematical parameters Peak Signal-to-Noise Ratio (PSNR) and compression ratio(CR). In this paper, we are using Haar wavelet decomposition for compression, as it has shown improved compression in recent years when used with the techniques like EZW,...
High efficiency video coding (HEVC) is a video compression standard that outperforms the predecessor H.264/AVC by doubling the compression efficiency. To enhance the coding accuracy, HEVC adopts sample adaptive offset (SAO) which classifies reconstructed pixels into different categories. During the pixel classification, however, SAO cannot use the raw samples in the current code-tree-block (CTB) boundary...
This paper presents a software implementation of context adaptive variable length decoder (CAVLD) and context adaptive variable length coder (CAVLC). Efficient algorithms for coding and decoding of Coeff_Token, levels, total zeros, and run_before have been developed, which are the five vital syntax elements of CAVLC and CAVLD. The necessary blocks namely Integer Transform, quantization and their inverses...
Rate Control (RC) is one of the crucial techniques for video compression and transmission because it controls compression bitrates in order to obtain optimum encoding quality within the available budget of transmission bitrates. In this paper, we conduct a research on developing a new unbuffered real-time rate control for video compression. With the objective to improve the overall rate control performance,...
The main purpose of the paper is to perform a quantitative and qualitative performance evaluation of the emerging standard H.265/HEVC in comparison to its predecessor H.264/AVC. The paper focuses on both the encoding and compression efficiency by measuring the PSNR values, SSIM scores and bit rate values of reference and non-reference signals. For the needs of the paper, the HEVC and AVC reference...
This paper presents results and analysis of a compression performance test carried out within standardization activities for the HEVC standard (ITU-T H.265 and ISO/IEC 23008-2) with the focus on UHD video content. The analysis is based on subjective tests, and the performance of the new standard is compared with its predecessor AVC (ITU-T H.264 and ISO/IEC 14496-2). The Degradation Category Rating...
There are more and more systems using mobile devices to perform sensing task, but it increases the risk of leakage of personal privacy and data. Data hiding is one of the important ways for information security. Even many data hiding algorithms have worked on providing more hiding capacity or higher PSNR, there are few algorithms that can achieve effective control on PSNR while ensuring hiding capacity...
The Performance of High Efficiency Video Coding (HEVC) has been improved greatly compared with H.264/AVC including some parallel processing tools to achieve fast implementation on multi-core or many-core platforms. However, CU-level parallel processing is still a challenging issue. In this paper, the relation among spatial motion candidates is analysed firstly. Then, a parallelism spatial candidate...
Algorithm customizable modules in video encoder play important roles in coding performance, and their algorithms can be optimized by adjusting multiple coding control parameters under a certain rate distortion complexity constraint. There are inter-correlated relationships among these modules. This paper analyzes the inter-module influence mechanism among algorithm customizable modules, and gives...
A lossy hyperspectral image compression method is proposed using online learning based sparse coding. The least number of coefficients are obtained to represent hyperspectral images by applying the sparse coding algorithm which is based on a dicriminative online dictionary learning method. Results indicate that a pre-analysis of the number of non-zero dictionary elements may help in improving the...
In this paper, we investigate a new communication strategy for embedded image transmission over a realistic Multiple-Input Multiple-Output (MIMO) wireless channel. The objective of our approach is to guarantee Quality of Service (QoS) required by the user for all possible channel states. In this scope, two major improvements are considered. The first is based on Unequal Power Allocation (UPA) and...
Scalable video coding (SVC) allows to encode videos in a unique bit stream at several operating points corresponding to different quality, spatial resolution and temporal frame rate. In this paper, we apply the allpass-based wavelet filters to wavelet-based scalable video coding (WSVC) for improving the coding performance, in particular, at reduced spatial resolutions. The allpass-based wavelet filters...
The paper presents analysis of multiple description coding (MDC) algorithm with time division of video stream and discussion of its efficiency in videoconferencing. Time division of video stream in two and three substreams are explored. Various video clips are used for experiments. Obtained results demonstrate that MDC with three descriptors can provide acceptable quality for decoded video in case...
The latest video coding standard HEVC (High Efficiency Video Coding) provides up to 35 intra prediction modes to achieve more accurate prediction. However, a larger number of prediction modes leads to higher encoding complexity. To accelerate the intra mode decision in HEVC, an improved algorithm based on numerical analysis of the neighboring reference samples of coding units is proposed. Four filters...
HEVC (High Efficiency Video Coding) standard is ready to be launched for consumer electronics. With better coding efficiency, the coding complexity is high. We propose a fast CU (Coding Unit) depth decision algorithm based on SKIP mode information in the neighboring block to early terminate the CU splitting. Compared to the HEVC standard software, the proposed method can save by up to 41% of the time...
Rate control is one of essential techniques in video coding in order to ensure quality of pictures under constraint condition of bandwidth. The rate control algorithm consists of three components: group of pictures (GOP) level rate control, frame level rate control and basic unit level rate control. In this paper, the rate control algorithm at frame level and basic unit level is studied to improve...
Currently it appears the latest video coding H.265 or known as High Efficiency Video Coding (HEVC). In the application of video streaming services using MPEG Dynamic Adaptive Streaming over HTTP (MPEG-DASH), the video quality level representations contained in the Media Presentation Description (MPD) composed by several video segments. The problems that arise when setting the length of the video segment...
In order to improve the performance of no-search fractal coding further, a two order fitting surface is proposed to approximate the range blocks and domain blocks. In our research, a novel gray-level transform with a fitting surface is introduced. On one hand, the fitting surface we propose can approximate the range and domain blocks better than the previous fitting planes, this can lead to smaller...
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