tailieunhanh - Efficient Region-of-Interest Based Adaptive Bit Allocation for 3D-TV Video Transmission over Networks

In this work, we propose a novel ROI-based bit allocation (BA) method which can adaptively extract and increase the visual quality of ROI while saving a huge number of encoding bitrates for video data. In the proposed method, we first detect and extract ROI based on the depth information obtained from 3D-TV video coding sequences. | VNU Journal of Science: Comp. Science & Com. Eng., Vol. 32, No. 1 (2016) 1-9 Efficient Region-of-Interest Based Adaptive Bit Allocation for 3D-TV Video Transmission over Networks Pham Thanh Nam, Vu Duy Khuong, Dinh Trieu Duong*, Le Thanh Ha VNU University of Engineering and Technology, Hanoi, Vietnam Abstract Due to characteristics of human visual system (HVS), people usually focus more on a specific region named region-of-interest (ROI) of a video frame, rather than watch the whole frame. In addition, ROI-based video coding can also help to effectively reduce the number of encoding bitrates required for video transmission over networks, especially for the 3D-TV transmissions. Therefore, in this work, we propose a novel ROI-based bit allocation (BA) method which can adaptively extract and increase the visual quality of ROI while saving a huge number of encoding bitrates for video data. In the proposed method, we first detect and extract ROI based on the depth information obtained from 3D-TV video coding sequences. Then, based on the extracted ROI, a novel BA scheme is performed to solve the rate-distortion (R-D) optimization problem, in which the higher priority bitrates are adaptively assigned to ROI while the total encoding bitrates of video frames are kept satisfying all constraints required by the R-D optimization. Experimental results show that the proposed method provides much better higher peak signal-to-noise ratio (PSNR) as compared to other conventional BA methods. Received 05 December 2015, revised 25 December 2015, accepted 31 December 2015 Keywords: ROI detection, Bit allocation, Rate-Distortion Optimization. 1. Introduction* focus more on a specific region, ROI [3], [4]. Therefore, based on ROI and HVS, how to improve the performance of video coding has important theoretical and practical value. In [5], Hu et al. used a macroblock (MB) classifcation based on R-D characteristics to generate three kinds of ROIs (called basic units). Then, a weighted