Television – Image signal processing circuitry specific to television – Transition or edge sharpeners
Patent
1992-05-18
1994-03-08
Kostak, Victor R.
Television
Image signal processing circuitry specific to television
Transition or edge sharpeners
H04N 514
Patent
active
052935418
ABSTRACT:
The present invention relates to an improved image improvement apparatus which can be applied to video apparatus and to various other types of image processing apparatus. This invention has as an object the emphasis of the edge directly adding a waveform step difference to a middle position of a waveform change portion of an envelope of color signals in the form where they have been amplitude modulated, and therefore provides an apparatus which prevents unnatural contour compensation, improves color saturation phenomenon without giving an unnatural sensation to the viewer, facilitates the use of digital circuits and for which adjustment of the edge effect is possible. The control signals are obtained by control signal generating circuit and subtracters which use the input signals, output signals of a delay circuit, and output signals of a delay circuit. The output signals of a synthesizer are supplied to a signal selector circuit along with said signals. The signal selector circuit selects and outputs one of the three supplied signals in accordance with a control signal, and obtains an output signal for which the edge has been emphasized. The input signals, and each of the output signals of the delay circuits are supplied to a signal selector circuit. The control signal formation circuit and the subtracters use the signals to obtain the control signals. The signal selector circuit selects and outputs one of the supplied five signals in accordance with the control signal and obtains an output signal for which the edge has been emphasized.
REFERENCES:
patent: 4030121 (1977-06-01), Faroudja
patent: 4281347 (1981-07-01), Tschannen
patent: 4918528 (1990-04-01), Oohashi
patent: 5151787 (1992-09-01), Park
patent: 5262978 (1993-11-01), Ito
Kostak Victor R.
Victor Company of Japan Ltd.
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