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Proceedings Paper

Hybrid Video Encoding For Real-Time Image Transmission
Author(s): G. Eichmann; R. Stirbl; R. Mammone
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Paper Abstract

It is often desired to transmit video signals over a data channel. However, when a standard 4 MHz bandlimited video signal is sampled at the Nyquist rate and encoded using four to six quantization levels (PCM) the data rate becomes 48-64 Mbs. This high digital bandwidth is usually unacceptable for most applications. Various digital alternatives such as delta modulation have been used to lower the data rates to about 22 Mbs. Computer simulations have shown that transform encoding can reduce this digital rate further. Additional reduction in the rate is usually desired to allow the use of available analog bandlimited video channels. In this paper we report on the effects of analog two dimensional spatial filtering in conjunction with delta modulation (DM) on digital bandwidth compression. Experimental and computer simulated results of hybrid DM enhancement encoder is presented. Results of computer simulation of a hybrid cosine transform encoder we also presented.

Paper Details

Date Published: 29 February 1980
PDF: 8 pages
Proc. SPIE 0209, Optical Signal Processing for C3I, (29 February 1980); doi: 10.1117/12.958288
Show Author Affiliations
G. Eichmann, The City College of the City University of New York (United States)
R. Stirbl, The City College of the City University of New York (United States)
R. Mammone, The City College of the City University of New York (United States)


Published in SPIE Proceedings Vol. 0209:
Optical Signal Processing for C3I
William J. Miceli, Editor(s)

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