A Feedback Control Scheme for Low Latency Constant Quality Mpeg-2 Video Encoding

This paper describes a coding control scheme for MPEG-2 which maintains the perceived video quality constant, and is suitable for real-time and low latency encoding. We have chosen a Proportional Integral Derivative (PID) scheme for the controller similarly to the works presented in 1,2 , and we adopt the same approach in designing the particular PID feedback function. The main reason for using a PID feedback function is the good tradeoo that it ooers between computational complexity, ease of design, and performance. We have chosen to use a new video quality metric called Moving Picture Quality Metric (MPQM). This metric models the human visual system and matches subjective evaluations correctly, outperforming existing quality metrics for video. 3 Simulations results will be shown for typical video sequences. A comparison with CBR encoding will be also presented.