Method of and apparatus for performing detail enhancement

Details Method of and apparatus for performing detail enhancement Method of and apparatus for performing detail enhancement

1990-01-23

1993-04-20

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

358447, 358166, G06K 940, H04N 514

Patent

active

052049191

ABSTRACT:
Detail enhancement is performed through effectively intensifying an image signal component having a predetermined spatial frequency. Based on the size of an image to be reproduced, a standard observation distance between the image and an observer is computed. A spatial frequency to be intensified is found so that it corresponds to about 12 cpd at the standard observation distance. The size of a pixel area suitable in producing an unsharp signal (U) is set to be inversely proportional to the spatial frequency. Signals (U13-U15) for various pixel areas are prepared, and one of these signals which is obtained for the suitable pixel area is selected to be the unsharp signal (U). An enhanced image signal (S+k(S-U)) is produced on the basis of the unsharp signal and a sharp signal (S).

REFERENCES:
patent: 4317179 (1982-02-01), Kato et al.
patent: 4335407 (1982-06-01), Atoji et al.
patent: 4887153 (1989-12-01), Uehara et al.
patent: 5001573 (1991-03-01), Sakamoto et al.

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