Rate Quality Factor Optimization for VP8 Video Codec for Mobile Communication Applications

Abstract

In this paper, mainly, we are proposing a better rate control algorithm optimization technique; it is applying for VP8 video coding for improving the performance and also quality of video codec data for mainly mobile communication applications. Actually, rate control plays an better role in video coding and transmission to provide the best video quality at the receiver end, and our proposed algorithm technique mainly exploits the existing constant quality control, which is governed by a parameter called quality factor (QF) to give a constant bit rates. For this purpose, a new mathematical model called the rate–quality factor(R–Q′) is derived to generate optimum QF for the current coding frame using the bitrates resulting from the encoding of the previous frame in order to meet the target bitrates. The process of calculating the QF is simple, and further calculation is not required for each coded frame. It also provides the rate control solution for both intra-frame-only and inter-frame coding modes. Our all experimental results show that the proposed scheme generates coding bits very close to target bits and provides improved coding efficiency at low bit rates also introducing simple complexity to measure for the video content. So that, in this proposed method considering previous results and comparing with our results then confirm by comprehensive experiments results.. The quality control parameter can be derived from Lagrangian multiplier and hence can be used in any type of encoder that uses RDO. Experimental results have shown that the proposed algorithm can control the bitrates within 1 % of the target bitrates on average, and it has better bitrates regulation over each GOP than the rate control algorithm of H.264. This is an advantage that is crucial in real-time multimedia data streaming in preventing buffer overflow or underflow. Performance of this video data is analyzed using PSNR and bitrates which needs to calculate once this new technique is implemented on specified plat form.