Processing picture signals

Details Processing picture signals Processing picture signals

1991-04-09

1992-11-03

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 22, 358135, 358430, G06K 936

Patent

active

051612054

ABSTRACT:
A luminance picture signal is applied to segmentation device (2) and a modal filter (3) to produce a region signal. Both the picture signal and the region signal are applied to a subtractor circuit (5) to produce a texture signal which is encoded in an encoder (7). The region signal is also applied to an edge mapping device (9) to produce a region list signal and an edge map of the original image. The edge map is subjected in an element prediction device (10) to a template to produce a prediction from a look-up table in a memory (12) regarding the value of an element in a fixed position adjacent the template. If the prediction is correct then a prediction error signal indicates no error while if an error exists either the prediction error signal conveys the actual value or where it may be found in a look-up table. The prediction error signal is encoded in a second encoder (14).

REFERENCES:
patent: 3769453 (1973-10-01), Bahl et al.
patent: 4325085 (1982-04-01), Gooch
patent: 4633325 (1986-12-01), Usubuchi
patent: 4868764 (1989-09-01), Richards
patent: 5025478 (1991-06-01), Morris et al.

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