VIDEO LOCALIZATION USING ARRAY OF MICORPHONES

Object localization helps to improve the surveillance system and provide extra
information from the camera. In this study DCS 5220 PT camera and array of
microphones are used to achieve camera localization based on audio inputs, the
system consists of microphones, multiplexing circuit, computer and PT camera. The
results obtains clearly demonstrates that this techniques is usable for videodiscussion
applications.
The localization algorithm is based on comparing the amplitude level of the signals
from all microphones and then selects the one with higher amplitude, strong noise
presence is one of the limitations of this techniques, however the type of noise add
can be clearly identified in the frequency spectrum, and for this reason signals are
compared in their frequency spectrum after the noise is been trimmed off. The DCS
5220 PT camera is IP camera manufactured by Dlink, it can pan and tilt by using
URL command; to utilize the camera a network is been created by using DR 300
wireless router with data rate up to 54 Mbps and can accommodate up to 4 network
elements.
The system is been developed for closed room localization but it can also be extended
to outdoor applications by using suitable sensors and suitable cameras, in video
discussions the system can be used in conferences and in parliament halls where such
a system can be used as an automatic cameraman.