tailieunhanh - Báo cáo toán học: " Real-time video quality monitoring"

Tuyển tập các báo cáo nghiên cứu khoa học ngành toán học được đăng trên tạp chí toán học quốc tế đề tài: Real-time video quality monitoring | Liu et al. EURASIP Journal on Advances in Signal Processing 2011 2011 122 http content 2011 1 122 o EURASIP Journal on Advances in Signal Processing a SpringerOpen Journal RESEARCH Open Access Real-time video quality monitoring Tao Liu Niranjan Narvekar Beibei Wang Ran Ding Dekun Zou Glenn Cash Sitaram Bhagavathy and Jeffrey Bloom Abstract The ITU-T Recommendation is a standardized opinion model for video telephony applications that uses video bitrate frame rate and packet-loss rate to measure the video quality. However this model was original designed as an offline quality planning tool. It cannot be directly used for quality monitoring since the above three input parameters are not readily available within a network or at the decoder. And there is a great room for the performance improvement of this quality metric. In this article we present a real-time video quality monitoring solution based on this Recommendation. We first propose a scheme to efficiently estimate the three parameters from video bitstreams so that it can be used as a real-time video quality monitoring tool. Furthermore an enhanced algorithm based on the model that provides more accurate quality prediction is proposed. Finally to use this metric in real-world applications we present an example emerging application of real-time quality measurement to the management of transmitted videos especially those delivered to mobile devices. Keywords video quality monitoring bitrate estimation frame rate estimation packet-loss rate estimation 1 Introduction With the increase in the volume of video content processed and transmitted over communication networks the variety of video applications and services has also been steadily growing. These include more mature services such as broadcast television pay-per-view and video on demand as well as newer models for delivery of video over the internet to computers and over telephone systems to mobile devices such as .