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

1989-11-02

1991-03-19

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358461, 358463, H04N 140

Patent

active

050015737

ABSTRACT:
Detail enhancement is achieved by producing an enhanced image signal (ES) on the basis of a sharp signal (S), a middle signal (M) and an unsharp signal (U). The sharp signal represents density of a pixel, the middle signal represents weighted mean density of a first area larger than a pixel, and the unsharp signal represents weighted mean density of a second area larger than the first area. Three differential signals (S-M, S-U, M-U) are obtained and multiplied by respective coefficients to become three enhancements signals. The enhanced image signal is obtained by adding the sharp signal and at least one of the three enhancement signals so that the detail enhancement is achieved at a middle range of spatial frequency.

REFERENCES:
patent: 4335407 (1982-06-01), Atoji et al.
patent: 4484232 (1984-11-01), Gast
patent: 4536803 (1985-08-01), Hennig
patent: 4591923 (1986-05-01), Urabe et al.
patent: 4670793 (1987-06-01), Yamada et al.
patent: 4785347 (1988-11-01), Ezuka et al.

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