Television – Image signal processing circuitry specific to television – Transition or edge sharpeners
Patent
1997-09-12
2000-06-06
Powell, Mark R.
Television
Image signal processing circuitry specific to television
Transition or edge sharpeners
348630, 348631, 358 37, 382266, H04N 964, H04N 968
Patent
active
060725397
ABSTRACT:
A method and arrangement for steepening the edges of a color signal, in which a control signal is generated which is obtained by differentiation, rectification and subsequent differentiation of the rectified first differentiation, and is temporarily assigned to the color signal, and in which, in dependence upon the control signal, chrominance values of reference pixels of the color signal are copied on edge pixels of the color signal in such a way that the chrominance values of reference pixels preceding the edge pixels are copied on the edge pixels in the case of a positive control signal and the chrominance values of reference pixels following the edge pixels are copied on the edge pixels in the case of a negative control signal, false chrominance values of pulses which are steepened are prevented in that a chrominance value of a reference pixel is copied on an edge pixel only when the values of the control signal in the assigned region between the reference pixel and the edge pixel do not have a zero crossing.
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Philips Semiconductors, Integrated Circuits, Preliminary Specification, SAA7158, Back END IC, Jul. 1994.
Harlos Hartmut
Volmari Frank
Goodman Edward W.
Powell Mark R.
Sajous Wesner
U.S. Philips Corporation
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