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State of the art video compression techniques use the motion model to approximate geometric boundaries of moving objects where motion discontinuities occur. Motion hints based inter- frame prediction paradigm moves away from this redundant approach and employs an innovative framework consisting of motion hint fields that are continuous and invertible, at least, over their respective domains. However,...
Surveillance visual systems play an important role in modern life, especially in the Internet of Things (IoTs) era. However, the limitation of bandwidth, energy resources and the heterogeneity of devices, networks and environments have been asking for a more powerful video coding solution, which provides not only the high compression efficiency but also the flexible scalability capability. In this...
Video coding has become widespread through mobile devices. At the same time, the adopted resolutions have been enlarged, demanding more coding efficiency and motivating the development of the new state-of-the-art standard, High Efficiency Video Coding (HEVC). However, to achieve the required efficiency the new standard greatly increased the computational intensity. That, allied to real-time constraints...
The increasing resolutions combined with storage and processing limitations of mobile devices point to the need for new compression techniques for video coding. Meanwhile, to achieve higher compression rates without compromising quality, the coding process becomes more and more complex. In reference software of HEVC the most time consuming step is the execution of Motion Estimation (ME), which is...
The Post-HEVC is the emerging video coding standard beyond the High Efficiency Video Coding (HEVC) standard. It is more complex in transformation and prediction steps but it offers the opportunity of 3D and 360° videos coding and compression. This paper presents different statistical analyzes of Post-HEVC encoded videos especially analysis on 1D and 2D transformation types and analysis on intra and...
In this paper, an efficient content-based rate control scheme is proposed in the context of rate-distortion optimization for 3-D wavelet-based scalable video coding (SVC). Despite the prevalence of the conventional rate control methods in DCT-based SVC, the underlying formulation is not directly applicable to 3-D wavelet-based SVC. Performing optimal rate control with 3-D wavelet coding methods is...
Virtual reality applications make use of 360-degree panoramic or omnidirectional video with high resolution and high frame rate in order to create the immersive experience to the user. The user views only a portion of the captured 360-degree scene at each time instant, hence streaming the whole omnidirectional video in highest quality is not efficient. In order to alleviate the problem of bandwidth...
Depth videos affect the visual quality of virtual view greatly, while conventional encoders are not adapted to encode depth videos. To solve this problem, we propose, in the paper, a fault-tolerance based joint block-level bit allocation scheme for depth video coding. The scheme classifies depth blocks into two classes by the fault-tolerance, and constructs virtual view perceptual quality based rate-distortion...
Energy efficiency has become a primary concern in the design of multimedia digital systems, particularly when targeting mobile devices. Approximate computing is a highly promising approach to address this challenge. This paper presents an architectural exploration in a variable block size motion estimation (VBSME) architecture using imprecise Lower-Part-OR Adders (LOA). These adders were applied to...
R-λ rate control scheme is recommended in the High Efficiency Video Coding (HEVC) standard, which shows high accuracy of bit rate control but lower rate distortion performance. In order to minimize the distortion subject to a target bit rate, a λ domain frame-level rate control scheme for low delay coding of HEVC was proposed. Firstly, an improved parameter updating method is presented for the frame...
The recent boom in the field of virtual and augmented reality has dramatically increased the prevalence of spherical video. Given the enormous amount of data consumed by spherical video, it is critical to achieve efficient compression for storage and transmission. Prevalent approaches simply project (via different geometries) the spherical video onto planes for processing with traditional 2D video...
A few years after standardization of the High Efficiency Video Coding (HEVC), now the Joint Video Exploration Team (JVET) group is exploring post-HEVC video compression technologies. In the intra prediction domain, this effort has resulted in an algorithm with 67 internal modes, new filters and tools which significantly improve HEVC. However, the improved algorithm still suffers from the long distance...
With the significant increase of the network heterogeneity and the wide use of emerging video applications such as wireless sensor networks, video surveillance systems or remote sensing, the Distributed Scalable Video Coding (DSVC) is a potential solution for efficiently transmitting and storing video data due to its high compression efficiency and low encoding complexity capabilities. In DSVC framework,...
With the development of artificial intelligence, more and more multimedia applications for various tasks have emerged in our daily life. Meanwhile, as one of the main information sources of the applications, a huge amount of video data has been being generated by portable or mounted cameras in daily basis for varying purposes including surveillance, in which case we may need computers to "watch"...
In recent years, there has been a call for Engineering Education to adopt innovative pedagogical techniques. One such innovation is Purdue University's Freeform environment for teaching undergraduate engineering courses. Freeform aims to enhance student learning with an Active, Blended, and Collaborative (ABC) learning environment. The majority of research into the Freeform environment thus far has...
In video coding, the transform-quantization scheme has been widely used to remove perceptual redundancy. Typically, transform and quantization are carried out separately for the prediction residuals. However, since the residual blocks commonly exhibit diverse spectral characteristics, the quantization with predefined constant dead-zone under a given parameter will inevitably deteriorate the compression...
This paper presents two intra prediction algorithms in High Efficiency Video Coding (HEVC) encoder for reducing the computational complexity and increase the encoding speed. The first algorithm takes advantage of the high spatial correlation among neighboring pixels to substitute the reference samples as the first row or first and second rows of the current block to be predicted, while the pixels...
The scalable extension (SHVC) of the High Efficiency Video Coding (HEVC) allows encoding in layers a video with multiple quality level such as resolution, bit-depth or Signal to Noise Ratio (SNR). Compared to the equivalent HEVC simulcast, the SHVC extension provides inter-layer prediction mechanisms enabling significant bit-rate savings. Moreover these inter-layer prediction mechanisms are less complex...
The rapid growth of the volume of multimedia data necessitates efficient compression and transmission of videos, which are requested in divergent bitrates owing to the diverse network bandwidth constraints or end device resolution/complexity requirements. Scalable video coding (SVC) is a coding paradigm that allows once-encoded video to be adapted to any desired bitrate or quality level, and thus...
Transrating is a bitrate transcoding technique that facilitates video applications in heterogeneous environments. This paper presents a fast coding-unit (CU) mode decision algorithm for transrating a once-encoded HEVC bitstreams to lower bitrate versions of diverse quality levels. The proposed method comprises three major parts. First, an early SKIP decision is based on the modes and motion vectors...
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