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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...
High efficiency video coding (HEVC) standard, introduced by joint collaborative team on video coding (JCT-VC) is the newest international standard of video compression. This standard provides more compression and better video quality, compared to the previous standards such as H.264. The higher compression efficiency is obtained at the cost of an increase in the computational load. One of the portions...
The basic idea of the video data mining is based on the content of multimedia features and the semantics related to these properties, from large multimedia data sets and analysis of the underlying discovery, effective, valuable, and understandable patterns. In this paper, based on multi-encoding mode for real-time trans-coding of video streams we firstly research on the input data reuse pattern matching...
The H.264 encoder has input parameters that determine the bit rate and distortion of the compressed video and the encoding complexity. These encoding parameters may significantly affect not only the encoding performance, but also affect the cross-layer design optimization for the video streaming transmission over wireless networks. However, it is very difficult to derive the impact factors of these...
Summary form only given. In this paper we propose a video coding optimization strategy for H.264/AVC encoder which uses HVS (Human Visual System) theory to improve the visual quality. It is based on a basic rule that sensitivity of distortion is different according to the image property. Most existing coding strategies which allocate fixed parameters to each unit within a frame are not reasonable...
In this work we study adaptive resource allocation for uplink transmission of correlated video sources. We consider a framework where multiple wireless sources transmit correlated information via a common base station. We introduce an optimization problem for sources to maximize the weighted sum of received quality of all videos, when source correlation can be used at the decoder in case of missing...
In this paper, the implementation of a DSP based video decoder compliant with the H.264/SVC standard (14496-10 Annex G) is presented. A PC-based decoder implementation has been ported to a commercial DSP. Performance optimizations have been carried out improving the initial version performance about 32% and reaching real time for CIF sequences. Moreover, conformance tests have been done using different...
This paper presents an efficient receiver-aware video transcoding system that systematically chooses the optimal transcoding operation from multiple options while meeting network and user constraints. Multi-objective optimization is used to select the best transcoding method that minimizes transcoding complexity and memory usage while ensuring the client constraints of bitrate and requested quality...
In our previous work, the rate-distortion optimized transform (RDOT) is introduced for Intra coding, which is featured by the usage of multiple offline-trained transform matrix candidates. The proposed RDOT achieves remarkable coding gain for KTA Intra coding, while maintaining almost the same computational complexity at the decoder. However, at the encoder, the computational complexity is increased...
Inter-picture prediction uses a local decoded picture for the reference, in order to avoid a mismatch between encoding and decoding. However, this scheme does not necessarily result in optimal coding efficiency since it requires encoding the processing altogether. Therefore, we study the use of the original picture as the reference. In this case, although the mismatch causes degradation of the picture...
Mode decision module is the computation intensive part in H.264. However, many macroblocks' best modes are skip mode, which can early terminate mode decision module. In this paper, a theoretical analysis is performed for rate-distortion optimization(RDO) algorithm for skip mode. As a result, an RDO based skip mode early detection algorithm is derived. Experimental results show that the proposed algorithm...
Visual quality assessment plays a crucial role in many vision-related signal processing applications. In the literature, more efforts have been spent on spatial visual quality measure. Although a large number of video quality metrics have been proposed, the methods to use temporal information for quality assessment are less diversified. In this paper, we propose a novel method to measure the temporal...
In this paper, an efficient search center definition algorithm is proposed for H.264/AVC. H.264/AVC achieved high coding efficiency by introducing some new coding tools including a new definition of the search center. However, the definition of the search center is not efficient in the case of significant motions. This work proposes some new search center candidates using spatial and temporal correlations...
Many image/video codecs are constructed by the combination of various coding tools such as block division/scanning, branch selection and entropy coders. Codec researchers are developing new coding tools, and seeking versatile combinations that offer improved coding efficiency for various images/videos. However, because of the huge amount of the combination, deriving the best combination is impossible...
In metro Passenger Information Systems (PISs), frequent train handoffs can cause severe video distortion. In this paper, we take an integrated design approach to jointly optimize application layer parameters and handoff decisions to improve video transmission quality over PISs. We present a train-ground video communication network based on fountain codes and IEEE 802.11p for metro PISs. The handoff...
In order to get the best mode, H.264 computes the cost of every mode for each block by RDO (rate distortion optimization) technique, but it increases a high computational complexity .This paper combines Pan's fast algorithm and an efficient fast mode decision for intra prediction is proposed. First, the intra prediction's types are decided by whether a block is smooth. Second, the Pan's fast algorithm...
In this paper, a novel end-to-end distortion model based on H.264 in the error-prone environment is developed. And then, a new JSCC (Joint Source-Channel Coding) video coding scheme based on the optimization of the constructed model is proposed. This scheme is capable of allocating source rate and channel rate adaptively in accordance with the channel condition such as SNR and channel bandwidth. The...
Multi-view video plus depth (MVD) data is a set of multiple sequences capturing the same scene at different viewpoints, with their associated per-pixel depth value. Overcoming this large amount of data requires an effective coding framework. Yet, a simple but essential question refers to the means assessing the proposed coding methods. While the challenge in compression is the optimization of the...
In this paper, instruction level optimization by exploiting SSE2 instructions is proposed to speed up the time-critical modules in H.264 encoder. SSE2 instruction set to execute a large number of small-size native data type operations in parallel to improve the real-time multimedia data processing capability. The contributions of the paper are manifold: Firstly, the paper shows SSE2 instruction set...
To improve compression capacity, motion compensation (MC) is utilized in H.264, which includes 6-tap FIR for 1/2-pel interpolation and 2-tap filter for 1/4-pel interpolation. MC uses up most decoding time, and is the expensive part of H.264 decoder. Some consumer electronics, such as smartphones, may not have enough processing capability to decode high definition video program in real time. MC must...
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