Video compression systems for low-latency applications [Elektronische Ressource] / von Ralf Michael Beuschel, geb. Schreier

Video compression systems for low-latency applications DISSERTATION zur Erlangung des akademischen Grades eines DOKTOR-INGENIEURS (DR.-ING.) der Fakultät für Ingenieurwissenschaften und Informatik der Universität Ulm von RALF MICHAEL BEUSCHEL, GEB. SCHREIER AUS FRIEDRICHSHAFEN Gutachter: Prof. Dr.-Ing. Albrecht Rothermel Mag. DI Dr. Margrit Gelautz, ao. Univ. Prof. Amtierender Dekan: Prof. Dr.-Ing. Michael Weber Ulm, 22.01.2010 Video compression systems for low-latency applications Abstract: This dissertation presents an in-depth analysis of latency sources in real-time video compression systems and describes strategies to minimize the system delay. Initially, the latencies of intra-frame and predictive coding in standard-mode video compression systems are examined. A theoretical analysis identifies the bitsream buffers – which are a pre-requisite of constant transmission bit-rate – as major sources of latency. In a second step, the results of experiments conducted using the “leaky-bucket” model on ten video sequences with sub-frame-level resolution are discussed. Based on these observations, the intra refresh coding method is identified as a key technique for low latency in predictive video compression systems.