Voice-bandwidth visual communication through logmaps: theTelecortex
Wallace, R.S.
Bederson, B.B.
Schwartz, E.L.
Vision Applications, New York, NY;
This paper appears in: Applications of Computer Vision, Proceedings, 1992., IEEE Workshop on
Publication Date: 30 Nov-2 Dec 1992
On page(s): 4-10
Meeting Date: 11/30/1992 - 12/02/1992
Location: Palm Springs, CA, USA
ISBN: 0-8186-2840-5
References Cited: 14
INSPEC Accession Number: 4437607
Digital Object Identifier: 10.1109/ACV.1992.240333
Current Version Published: 2002-08-06
Abstract
Presents a robotic video telephone application of the Cortex-1
miniaturized space-variant active vision system. The embedded processor
architecture of Cortex-1 enables it to implement a variety of functions
not found in conventional video telephones, for example the camera
tracks moving users with its pantilt mechanism. The authors also report
an analog channel coding scheme to transmit logmap video images through
band-limited analog channels such as the public switched telephone
network (PSTN). The transmitter divides the frequency band into 768
channels, and modulates two values in quadrature on each channel. Some
channels are reserved for special calibration signals enabling the
receiver to recover both the phase and magnitude of the transmitted
signal. The remaining channels carry pixel intensities
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