Technique for encoding pictorial information

Details Technique for encoding pictorial information Technique for encoding pictorial information

1980-04-11

1981-07-14

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 712

Patent

active

042789966

ABSTRACT:
Pictorial information is encoded using an interframe prediction technique which accounts for spatial and/or temporal changes in illumination. In one embodiment (FIG. 3), the intensity value of each element of a picture is predicted using the intensity of the corresponding element in a previous frame and a recursively updated gain factor .rho. which can account for both illumination changes as well as object movement. The prediction error and pel location is encoded only if the error exceeds a predetermined threshold. In a second embodiment (FIG. 3), additional predictions are made using displacement compensated prediction alone and in combination with gain adjustment. The best predictor is selected and the corresponding prediction error transmitted only if it is large.

REFERENCES:
patent: 3632865 (1972-01-01), Haskell et al.
patent: 4051530 (1977-09-01), Kuroda et al.
patent: 4218703 (1980-08-01), Netravali et al.
patent: 4232338 (1980-11-01), Netravali et al.
patent: 4245248 (1981-01-01), Netravali et al.
F. W. Mounts, "A Video Encoding System Using Conditional Picture-Element Replenishment", B.S.T.J., vol. 48, No. 7, 9-69, pp. 2545-2554.

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