Zusammenfassung
This thesis provides an analysis of the entire video communication system assuming a wireless, frequency- and time-selective channel under low-delay constraints. The whole system consists of a standard-compliant video codec (HEVC), a channel codec and a modem (OFDM). A design methodology in terms of the rate-distortion optimization and a suitable framework to asses the entire system is proposed. It has synchronization capabilities and a suitable metric that turns out to be a key component of the rate-distortion based optimization procedure.
The trade-offs and interrelations of the parameters that have the most significant impact in the total distortion and robustness of the video signal are investigated. By means of intensive and sufficient simulations of an entire video transmission chain, it has been shown that the multiple techniques introduced and described in this thesis are viable tools for the design and optimization of specific video communication systems and its components.
C O N T E N T S
1 introduction 1
1.1 Basics of Video Communication Systems . . . . . . . . . . 1
1.2 Challenges . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2.1 Shannon’s Separati...
Schlagworte
Videocodierung Fehlerverschleierung Videokommunikationssysteme Orthogonal Frequency-Division Multiplexing (OFDM) Video coding error concealment video communication systems- 1–14 1 Introduction 1–14
- 120–124 5 Conclusions 120–124
- 125–138 Bibliography 125–138
3 Treffer gefunden
- „... prediction.Conceptually, previously reconstructed pictures are stored in a referencepicture buffer and are used to make a ...” „... prediction blocks (PB) for the inter prediction ormotion prediction.In HEVC there are two closely ...” „... trans-form and quantizer are added to the prediction values. The predictionblock computes the inter and intra ...”
- „... Frequency-Division MultiplexingPAPR Peak-to-Average Power RatioPB Prediction BlocksPOC Picture Order CountPSNR Peak ...” „... Signal-to-Noise Ratioacronyms IXPU Prediction UnitQAM Quadrature Amplitude ModulationQPSK Quadrature Phase Shift ...”
- „... degradation for subsequent framesdue to inter-prediction dependencies. To overcome this, the videodecoder must ...”