Graphics image coding for freeze-frame videoconferencing
Joan L. Mitchell, William B. Pennebaker, Dimitris Anastassiou, Keith S. Pennington · IEEE Transactions on Communications · 1989
A technique is presented for coding images that are bilevel in nature but have been captured in continuous-tone format. Following various stages of image processing, a three-level image is generated, and compressed to about 0.1 to 0.2 b/pixel. The technique has been implemented in the IBM freeze-frame videoconferencing system.>