Reduction of color transition distortions in NTSC/PAL encoder

Details Reduction of color transition distortions in NTSC/PAL encoder Reduction of color transition distortions in NTSC/PAL encoder

1997-09-29

1999-11-30

Miller, John W.

Television

Image signal processing circuitry specific to television

Hue control

348642, 348654, 348662, H04N 964

Patent

active

059951648

ABSTRACT:
In a video encoder, the color distortion between pixels can be reduced by encoding the hue transition to limit very large hue (phase) transitions and encode a corresponding smaller phase transition. This produces fewer spurious colors between pixels during the encoding. This can be done by comparing the change in hue value to a reference value and adding or subtracting 2 .pi. to this reference value to reduce the absolute value of a modified delta hue signal.

REFERENCES:
patent: 3688021 (1972-08-01), Ekstrand
patent: 4714954 (1987-12-01), Yoshinaka et al.
patent: 4939572 (1990-07-01), Kosaka et al.
patent: 5786865 (1998-07-01), Ayenberg et al.
"Nideo Demystified," Second Edition; Keith Jack; HighText Publications; San Diego, California; 19 .

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