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Video coding standards (e.g. H.264, HEVC) use slice, consisting of a header and payload video data, as an independent coding unit for low latency encode-decode and better transmission error resiliency. In typical video streams, decoding the slice header is quite simple that can be done on standard embedded RISC processor architectures. However, universal decoding scenarios require handling worst case...
This paper presents a fast thumbnail extraction method for HEVC. The proposed method reconstructs only the 4×4 boundary pixels requested for a thumbnail image. We found that the proposed partial decoding method reduced decoding time significantly compared to the conventional method. In addition, the visual quality of the obtained thumbnail images was nearly identical to that of thumbnail images extracted...
This paper explains how the Open Reconfigurable Video Coding CAL Actor Language compiler framework (Orcc) has been used, along with the Open Multi-Processing (OpenMP) API, to implement an HEVC video decoder based on multicore DSP technology. Currently, two DSP cores have been used, though the technique may be applied to the development of N-core based implementations. The two core based decoder presented...
This paper proposes an HEVC-based method for lossless compression of Whole Slide pathology Images (WSIs). Based on the observation that WSIs usually feature a high number of edges and multidirectional patterns due to the great variety of cellular structures and tissues depicted, we combine the advantages of sample-by-sample differential pulse code modulation (SbS-DPCM) and edge prediction into the...
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...
In this paper, a coding scheme targeting stereoscopic content for polarized displays is introduced. It is proposed to use row-interleaved sampling of the views. Asymmetry is achieved by selection of odd/even rows for different views based on the format they will be shown on a polarized display. Coding performance of several different multiview coding schemes with inter-view prediction was analyzed...
HEVC (High Efficiency Video Coding) is the newest video compression standard. Compared with the previous standards, the Coding efficiency is greatly improved at the cost of much higher codec complexity. So, many people improve the HEVC algorithm from the hardware level and software level. For the IQ/IT (inverse quantization/inverse transform) part, HEVC just processes one TU block one by one. And...
The concept of data compression in CODECs is based on pixel prediction to avoid redundancy. For the security of data compressed with the H.264/AVC CODEC, researchers are thinking to selective encryption. This paper presents a chaos based encryption method inserted in the H.264/AVC used for video conferencing application. It consists of the encryption of Intra prediction mode. The results show that...
For exploiting the spatial redundancy in intra coded coding unit (CU), a block-based angular intra prediction is defined in high efficiency video coding (HEVC). In lossless coding condition without transform, quantization, and in-loop filter, pixel wise differential pulse code modulation (DPCM) achieves better coding improvement than block-based prediction since it is possible to make intra prediction...
A high pressure is put on mobile devices to support increasingly advanced applications requiring more processing capabilities. Among those, the emerging High Efficiency Video Coding (HEVC) provides a better video quality for the same bit rate than the previous H.264 standard. A limitation in the usability of a mobile video playing device is the lack of support for guaranteeing stand-by time and up...
This paper introduces a method for downsizing of video size at time of decoding based on H.264/AVC standard. Inverse Transform (IT), Inverse Quantization (IQ), Motion Compensation and Intra prediction modified units are used instead of using standard units lead to reduction of calculation and reduction of decoding time by 40%.
Recently, network coding and channel coding are widely applied for scalable video coding in order to achieve the reliable transmission of multimedia data. Network coding as hierarchical network coding (HNC) provides unequal erasure protection for scalable layers and addresses the process of decoding layer by layer from higher to less importance. Similar with that scheme, expanding window fountain...
Wyner-Ziv video coding (WZVC) is a video compression paradigm based on distributed source coding principles. WZVC allows reducing the complexity of video processing at the encoder thus providing lower energy consumption. One of the key operations of WZVC is correlation noise modeling which is responsible for estimation of statistical characteristics of errors arising in virtual dependency channel...
Robust multi-view video transmission over error prone networks is a technical challenge problem for multi-view video coding (MVC). In this paper, a frame loss error concealment scheme is proposed for MVC to address the challenging problem at the decoder side. Different from traditional motion information derivation in temporal domain for single-view video coding, two novel information derivation schemes,...
The performance of the mobile video broadcast is weakened when applying the traditional broadcast scheme which is forced to pick a single bit rate supported by the worst receiver. It leads to the drawback that receivers with better channels cannot obtain better video qualities. This paper proposed distributed Realcast, an analog video delivery scheme based on real value transmission, to provide differentiated...
In this paper, we propose a new framework for compressive video sensing (CVS) that exploits the inherent spatial and temporal redundancies of a video sequence, effectively. The proposed method splits the video sequence into the key and non-key frames followed by dividing each frame into the small non-overlapping blocks of equal sizes. At the decoder side, the key frames are reconstructed using adaptively...
In this paper, an application-specific instruction-set processor (ASIP) implementation for interpolation operation for high efficiency video coding (HEVC) decoders is proposed. HEVC is a new video compression standard that has higher compression efficiency than the previous ones. The proposed ASIP is implemented on the XRC_D2MR processor by augmenting the instruction set architecture in Xtensa Tensilica...
In recent years, cloud computing has emerged as a viable alternative for many computationally intensive applications. Offloading an application to the cloud has many advantages, but power consumption is still an important concern. Service providers should minimize power while maintaining customer's quality of service requirements. Dynamic Voltage and Frequency Scaling (DVFS) is an effective method...
The complexity of high performance digital systems has rapidly increased. When we design such systems in a system-on-chip (SoC), lots of predesigned intellectual properties (IPs) are integrated to build a system. To verify the functionality of such systems, conventional simulation methods take extremely long time and they have limited debugging capability due to the existence of many predesigned IPs...
With the widespread popularity of mobile terminals, wireless video has become an indispensable part of daily life. Recently, an uncoded transmission scheme called SoftCast was presented to provide graceful quality transition. After linear transformation, the energy of the signal is concentrated to a few coefficients. However, the protection of these coefficients is not enough in SoftCast. This paper...
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