Digital luminance signal transient improver and peaker

Details Digital luminance signal transient improver and peaker Digital luminance signal transient improver and peaker

1989-07-13

1992-09-08

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 37, 358106, H04N 514, H04N 964

Patent

active

051463199

ABSTRACT:
A luminance signal transient improver and non-linear peaking arrangement processes a digital luminance signal by generating a first difference signal and a second difference signal and developing therefrom a threshold control signal, a high frequency peaking signal and a low frequency peaking signal. The high frequency peaking signal consists of the second difference signal as modified by a high pass filter and the threshold control signal consists of the second difference signal as modified by a threshold circuit. The first difference signal is passed through an absolute value circuit and a low frequency emphasis circuit and modified by the threshold control signal and added to the high frequency peaking signal. The combined result is subjected to non-linear filtering and added to the luminance signal to form a horizontally processed luminance signal. A comb filter develops a vertical detail component representing differences between successive lines of luminance and combines the vertical detail component with the luminance signal to form a vertically processed luminance signal which is combined with the horizontally processed luminance signal to develop a fully processed luminance signal.

REFERENCES:
patent: 4030121 (1977-06-01), Faroudja
patent: 4603353 (1986-07-01), Henson
patent: 4623924 (1986-11-01), Wargo et al.

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