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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...
To support spatial scalability, the scalable extension of H.264/AVC (SVC) uses video cropping or uniform scaling to downscale the original higher-resolution (HR) sequence to a lower resolution (LR) one. Both operations, however, will cause critical visual information loss in the retargeted frames. The content-adaptive spatial scalability SVC coders (CASS-SVC) use non-homogeneous scaling to avoid critical...
We address an important issue of fully low-cost and low-complex video compression for use in resource-extremely limited sensors/devices. Conventional motion estimation-based video compression or distributed video coding (DVC) techniques all rely on the high-cost mechanism, namely, sensing/sampling and compression are disjointedly performed, resulting in unnecessary consumption of resources. That is,...
Some video coding standards for interlace video is specified by ITU and ISO organization, in which Macroblock level frame/field adaptive (MBAFF) method can get the best performance. Because of many kinds of Macroblock division methods to make it time-consuming for motion estimation, and when displayed on progressive screen, MBAFF can't solve the problem such as line crawling etc. An extended video...
Wireless visual sensor networks are potentially applicable for several emerging applications. Since the resource-limited restriction for a visual sensor node (VSN), efficient resource allocation for video compression is challenging. In this paper, a power-rate-distortion (PRD) model-based low-complexity multiview video codec is proposed. Our PRD model is used to characterize the relationship between...
Low-complexity video encoding has been applicable to several emerging applications. Recently, distributed video coding (DVC) has been proposed to reduce encoding complexity to the order of that for still image encoding. In addition, compressive sensing (CS) has been applicable to directly capture compressed image data efficiently. In this paper, by integrating the respective characteristics of DVC...
To satisfy the requirement of embedded video encoder in various scenarios, an embedded multi-channel video coding system based on multimedia processor-DM642 DSP is designed in this paper. For real-time application requirement, we optimize the encoder at three levels: Firstly, at algorithm level, develop some fast algorithm fitting for DSP; secondly, at system level, adjust the architecture of encoder...
Many visual devices are applied to mobile phone, PDA, or other products lately. These devices can receive real-time video from wireless network or internet. In order to watch video programs, the video frame size received from various devices must be changed. Although many fast down-scaling algorithms have been proposed, most of traditional schemes focus mainly on downsizing the video by an integral...
In traditional video compression standards, the quantizer plays an important role. It is the same for the distributed video coding (DVC), which can be thought to consist of a quantizer followed by a Slepian-Wolf encoder. The quantizer has dominant effect on the quality of the reconstructed video. In this context, this paper proposes quantization scheme for DVC based on a modified Lloyd-Max algorithm...
In distributed video coding, individual frames are encoded independently but decoded conditionally. The Wyner-Ziv theorem-based source coding with side information only available at the decoder states that an intraframe encoder with interframe decoder system can approach the efficiency of a conventional interframe encoder and decoder system. In this paper, a new block discrete cosine transform (DCT)-based...
To meet the requirement of distributed video coding in resource-limited sensor networks, Wyner-Ziv theorem-based source coding with side information available at the decoder states that an intraframe encoder with interframe decoder system can achieve comparable coding efficiency of a conventional video codec. Most existing Wyner-Ziv video coding systems are with light encoder and heavy decoder. In...
Nowadays, with the growing of multimedia applications, requirement for embedded multimedia system becomes popular. The implementation of a multi-model video encoder is introduced, which is composed of DSP (digital signal processor) and FPGA (field programmable gate array). The FPGA complete some auxiliary tasks, such as video acquisition and YUV separation, while the DSP is dedicated for video compression...
Video data security is very important for multimedia commerce such as video-on-demand and real-time video multicast. Nowadays, many video encryption methods have been put forward. This paper presents a new kind of video encryption approach that based on the syntax character of compressed digital video bitstreams. Using this approach, we can shuffle the critical data blocks in each video frame with...
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