One Novel Rate Control Scheme for Region of Interest Coding
For video communication, Region of Interest (ROI) coding offers an efficient way of improving the quality of videos. In this paper, we propose a novel rate control scheme for Region of Interest coding. We set the area covering people are interested in as
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College of Electronic and Information Engineering, South China University of Technology, Guangzhou 510641, Guangdong, China [email protected], {zzwu,zhangxie,yjxiang}@scut.edu.cn 2 College of Automation, Guangdong University of Technology, Guangzhou 510006, Guangdong, China [email protected]
Abstract. For video communication, Region of Interest (ROI) coding offers an efficient way of improving the quality of videos. In this paper, we propose a novel rate control scheme for Region of Interest coding. We set the area covering people are interested in as the Region of Interest (ROI) to preserve better quality than the background. In addition, we set a coefficient ω to evaluate the significance of ROI, and then use it to calculate the mean absolute distortion (MAD) of the ROI and the background. Finally, the quantization parameter (QP) can be decided by the quadratic model. The difference of QP can be used to distinguish the background and the ROI with the QP which is obtained in advance, so the ROI mask cannot be coded and transmitted. Moreover, through adjusting the coefficient ω to control the degree of the protection of the ROI, our method can protect the ROI effectively and control the difference between the background and the ROI expediently. Experimental results show that the scheme works well in protecting the ROI, the objective quality of the ROI will be improved and the bit-rate can be controlled in a certain range. Keywords: Rate control Region of Interest (ROI) Quantization parameter Video coding
1 Introduction With the development of 3C (Communication, Computer and Consumer electronics) technology, more and more people think about the confliction between the storage or bandwidth resources and the demand for information. In fact, the demand cannot be meted forever. Rate control plays an important role for video coding and transmitting, because it helps to achieve the balance between the video quality and the code stream size. However, the regions appearing in the scenes which people are interested in, called as Region of Interest (ROI), are more important than the background. For the given bit-rate, bits allocated for ROI should be more than that for the background. For example, the area of the shoulder and head of characters in video conference, the area of some small target which carry more important information in the aviation images, © Springer International Publishing Switzerland 2016 D.-S. Huang et al. (Eds.): ICIC 2016, Part III, LNAI 9773, pp. 139–148, 2016. DOI: 10.1007/978-3-319-42297-8_14
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the area of lesions in the medical images and so on, so that its quality should be better preserved. Therefore, we consider applying the ROI coding to those scenes. In the recent years, people have made many researches in the ROI coding and gained many beneficial results. The processing methods of the ROI coding include several categories: (a) The first category method treats the ROI as an independent part, then coding them independently, protecting and transmitting them selectively. For exa
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