Generally, speaker location detection in video conferencing is audio-based. However, physical room environment which is beyond the control of the speaker detection system can severely change room acoustics. Room acoustics introduce interference and can deteriorate the performance of audio-based speaker detection system. In this paper, we propose a video-based speaker detection method which can be used independently or along with audio-based detection systems. The information on speaker location is intended to create 3-dimensional audio reproduction in order to provide more reality to video conference. In the proposed ethod, we detect moving lips in video sequences. We first detect lips using color information and determine whether the lips are moving. Experiments with real videos provide promising results.
In this paper, we investigate video quality on various LCD monitors. There exists a large variance in video quality among various LCD monitors. Due to this unavoidable variance in LCD monitors, there has been a concern about the stability and repeatability of subjective and objective testing for LCD monitors. We performed subjective testing the DSCQS method and compare subjective quality ratings on the 5 LCD monitors. The experimental results show that the correlation coefficients among DMOS’s with respect to each monitor are acceptably high. Thus, it may be possible to develop models for objective measurement of video quality on LCD monitors. In the paper, physical parameters such as color temperature, contrast, brightness, response time, etc will be presented and thorough analyses will be provided.