Hybrid image source encoding for real-time image transmission

G. Eichmann, R. Mammone, R. Stirbl, J. Keybl, R. Silber

Research output: Contribution to journalConference articlepeer-review


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.

Original languageEnglish (US)
Pages (from-to)204-209
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - Dec 8 1978
Externally publishedYes
EventReal-Time Signal Processing I 1978 - San Diego, United States
Duration: Aug 28 1978Aug 31 1978

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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