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8 December 1978 Hybrid Image Source Encoding For Real-Time Image Transmission
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It is often convenient to transmit video signals over a data channel. However, when a signal is digitally encoded using PCM, the data rate is extremely high. For example, using a 4MHz bandlimited video signal, the data rate is often 48-64 Mbs. Further, typical film based image sensors generate billions of bits of information which take a long time to convey over realistic data channels. Thus in applications where real-time image transmission is of interest there is a need to compress the analog video bandwidth. In this paper we report on experiments that use hybrid source encoding techniques to compress video images. We use analog coherent spatial Fourier filtering for preprocessing and real-time linear and adaptive video delta modulators to digitally encode video images. The effects of spatial filter and digital rate parameters on image bandwidth compression is determined. Results of amplitude companding using half-tone techniques are also considered.
© (1978) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
G. Eichmann, R. Mammone, R. Stirbl, J. Keybl, and R. Silber "Hybrid Image Source Encoding For Real-Time Image Transmission", Proc. SPIE 0154, Real-Time Signal Processing I, (8 December 1978);


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