Color signal enhancing cirucit for improving the resolution of p

Details Color signal enhancing cirucit for improving the resolution of p Color signal enhancing cirucit for improving the resolution of p

1990-08-27

1992-06-23

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 27, 358 36, 358166, H04N 968

Patent

active

051247860

ABSTRACT:
A color-signal enhancing circuit of the invention comprises a pair of first and second high-pass filters, a control circuit, and a pair of first and second gain controllers. The high-pass filters provide a predetermined frequency region restriction to color difference signals. The control circuit may comprise a first and second gain controllable amplifiers which provide a predetetermined coefficient to outputs from the high-pass filters, an adder which adds outputs from the first and second amplifiers, and a convertor which provides to an output of the adder a coefficient calculated in a predetermined operation in accordance with the polarity of input signals inputted thereto. In an alternative arrangement, a pair of the high-pass filters may be replaced by a pair of low-pass filters. The gain control signal is obtained from the information on high frequency components or on low frequency components of color difference signals and, with this single gain control signal, the gains of the color difference signals inputted are controlled, whereby it is possible to enhance color signals in such a way that there will be no appearance of false colors at turning points of color changing.

REFERENCES:
patent: 3816846 (1974-06-01), Leroy et al.
patent: 4337479 (1982-06-01), Tomimoto et al.
patent: 4766487 (1988-08-01), Tanaka et al.
patent: 4870481 (1989-09-01), Kawamata
"TV Society Technology Report", TEBS 96-5, publsihed May 24, 1984.

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