Television – Format conversion – Involving both line number and field rate conversion
Patent
1996-07-10
1998-06-23
Kostak, Victor R.
Television
Format conversion
Involving both line number and field rate conversion
348624, 348454, H04N 701
Patent
active
057710740
ABSTRACT:
To avoid color defects in the motion-compensated luminance signal, which defects occur in non-motion-compensative time-interpolation of the color signal, a method includes the steps of generating a second color difference signal from a first color difference signal supplied at a first field repetition frequency by way of field repetition, the second color difference signal having a second field repetition frequency which is doubled with respect to the first field repetition frequency, generating a third, time-averaged color difference signal from the second color difference signal by time-averaging of two consecutive fields, generating a fourth, spatially high-resolution color difference signal by a spatially high-resolution interpolation of two consecutive fields from the second color difference signal, forming a fifth color difference signal to be supplied as a linear combination of the third and the fourth color difference signals by means of coefficients which are complementary with respect to a constant, and determining, in accordance with a vertical spatial frequency, which can be derived from picture contents representable by the color difference signals, or in accordance with a local rate of motion, the coefficients in such a way that substantially the third color difference signal, and in the reverse case substantially the fourth color difference signal, are used for forming the fifth color difference signal in the linear combination in the case of rapid motion or low spatial frequencies.
REFERENCES:
patent: 4335395 (1982-06-01), Clarke
patent: 4667222 (1987-05-01), McCoy
patent: 5159437 (1992-10-01), Lee
patent: 5221966 (1993-06-01), Clayton et al.
Goodman Edward W.
Kostak Victor R.
U.S. Philips Corporation
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