A MPEG-2/MPEG-4 Quantizer to Improve the Video Quality in IPTV Services

The main issue in Digital Terrestrial Television and in IPTV networks is the Quality of Experience received by the end users. For this reason, there are needed mechanisms to automatically measure the video quality of the images received. In this paper we analyze video quantization in order to determinate an optimal quantizer_scale factor value for its transmission. Then, it is used as an automatic measure to improve the video quality received by the end user. The paper shows the measurements taken for Video Quality, for Video Quality Metric and the bandwidth consumed for several types of video quality. Finally, we show the visual comparison between a high quantizer_scale factor and a reference video. Our work shows that an optimal quantizer_scale factor can be used to save bandwidth in an IPTV network or to improve the Video Quality for the same bandwidth consumption.