Footnote 6 The following references describe the technology upon which Cell and CellB are based:

Cambell, G., T.A. DeFanti, J. Frederiksen, S.A. Joyce, L.A. Leske, J.A. Lindberg, and D.J. Sandin, [1986], "Two Bit/Pixel Full Color Encoding," Computer Graphics, vol. 20, no. 4, pp. 215-224, August 1986.

Delp, E.J., and O.R. MItchell, [1979], "Image Compression Using Block Truncation Coding," IEEE Transactions on Communications, vol. 27, no. 9, pp. 1335-1342, September 1979.

Healy, D.J., and O.R. Mitchell, [1981], "Digital Video Bandwidth Compression Using Block Truncation Coding," IEEE Transactions on Communications, vol. 29, no. 12, pp. 1809-1817, December 1981.

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