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Efficient Region-of-Interest Scalable Video Coding with Adaptive Bit-Rate Control

DOI: 10.1155/2013/281593

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This work relates to the regions-of-interest (ROI) coding that is a desirable feature in future applications based on the scalable video coding, which is an extension of the H.264/MPEG-4 AVC standard. Due to the dramatic technological progress, there is a plurality of heterogeneous devices, which can be used for viewing a variety of video content. Devices such as smartphones and tablets are mostly resource-limited devices, which make it difficult to display high-quality content. Usually, the displayed video content contains one or more ROI(s), which should be adaptively selected from the preencoded scalable video bitstream. Thus, an efficient scalable ROI video coding scheme is proposed in this work, thereby enabling the extraction of the desired regions-of-interest and the adaptive setting of the desirable ROI location, size, and resolution. In addition, an adaptive bit-rate control is provided for the region-of-interest scalable video coding. The performance of the presented techniques is demonstrated and compared with the joint scalable video model reference software (JSVM 9.19), thereby showing significant bit-rate savings as a tradeoff for the relatively low PSNR degradation. 1. Introduction Recently, significant changes have taken places in the content distribution network industry. The availability of cheaper and more powerful devices (such as smartphones and tablets, which have the ability to play, create, and transmit video content on various mobile networks) places unprecedented demands for high capacity and low-latency communications paths. The reduction of cost of digital video cameras, along with development of user-generated video sites (e.g., Vimeo, YouTube), has stimulated the new user-generated content sector. Growing premium content coupled with advanced video technologies, such as the Internet TV, will replace conventional technologies (e.g., cable or satellite TV) in the near future [1]. In this context, high-definition, highly interactive networked media applications pose challenges to network operators. The variety of end-user devices with different capabilities, ranging from smartphones with relatively small displays and restricted processing power to high-end PCs with high-definition displays, has stimulated a significant interest in effective technologies for providing video content in various spatial formats, employing limited computational complexity resources and operating under low bit-rates [2]. Much of the attention in the field of video adaptation is currently directed to the scalable video coding (SVC) extension [3] of

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