Chrominance resampling for color images

Details Chrominance resampling for color images Chrominance resampling for color images

1996-04-25

1998-01-27

Kostak, Victor R.

Television

Format conversion

Specified chrominance processing

348441, H04N 1102

Patent

active

057126879

ABSTRACT:
Chrominance resampling for color images to produce an upsampled chrominance signal from a subsampled chrominance signal uses luminance to detect edges in the color image. The detection of edges produces an Index signal which is used to select a particular one of a plurality of lowpass filters for filtering a chrominance signal expanded from the subsampled chrominance signal. For interlaced video signals a field/frame decision is made based upon relative motion between the fields of each frame, which decision is input to the filter selection process. The resulting chrominance samples in the upsampled chrominance signal are offset to co-site the samples with the corresponding luminance samples at the output.

REFERENCES:
patent: 5124688 (1992-06-01), Rumball
patent: 5387937 (1995-02-01), Dorricott et al.
patent: 5475436 (1995-12-01), Watanabe et al.
patent: 5555030 (1996-09-01), Takamoto et al.
patent: 5574506 (1996-11-01), Rhodes
ISO/IEC 13818-2: 1995(E) Recommendation ITU-T H.262 (1995 E) p. 17-23.

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