Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1989-02-13
1990-10-09
Shepperd, John W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 41, H04N 964
Patent
active
049624199
ABSTRACT:
In a signal processing network including a color correction matrix and gamma compensation, detail processing is disclosed that includes a detail extraction circuit for generating a detail signal from an un-matrixed green signal and a detail enhancement circuit for adding the detail signal to the matrixed, gamma-corrected red, green and blue signals. The un-matrixed green signal is converted to a gamma-corrected green signal and separately input to vertical and horizontal high pass filters, which separate detail components representative of vertical and horizontal detail, respectively. The vertical detail is additionally input to a horizontal low pass filter to eliminate excessive enhancement of diagonal image components. The detail components are cored and input to the detail enhancement circuit. As a result of bypassing the color correction matrix and inserting the modified detail, including the diminished diagonal contribution, into the signal channel after gamma correction, the various detail components receive a substantially uniform visual enhancement regardless of orientation or density in the image.
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"Improved Signal Processing Techniques for Color Television Broadcasting", McMann & Goldberg, SMTE, vol. 77, 3/68, pp. 221-228.
D'luna Lionel J.
Hibbard Robert H.
Parulski Kenneth A.
Eastman Kodak Company
Shepperd John W.
Woods David M.
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