Lehrstuhl für
Multimediakommunikation und Signalverarbeitung
Prof. Dr.-Ing. André Kaup

Reducing Chrominance Sub-Sampling Artifacts for Screen Content Coding Applications

Betreuer:M.Sc. Andreas Heindel (Raum 01.178)
Hochschullehrer:Prof. Dr.-Ing. André Kaup

Web conferencing and remote desktop applications require the desktop of one computer to be encoded and transmitted to be displayed on a remote screen. However, common video codecs work using the YCbCr color space involving 4:2:0 chrominance sub-sampling, which may lead to annoying artifacts with screen content, e.g. at sharp edges or text.

There are different possibilities to avoid or reduce these artifacts. For example the local relationships between luminance and chrominance values can be modeled. This may be supported by exploiting the special characteristics of screen content data. Also special sub-sampling techniques may help to reduce these artifacts.

The task of this Master’s thesis is the implementation and performance comparison of several artifact reduction approaches. Due to the special characteristics of the investigated artifacts, the performance analysis regarding visual quality is a crucial procedure and special emphasis should also be put on this step.