Non-linear aspect ratio adaptation

Details Non-linear aspect ratio adaptation Non-linear aspect ratio adaptation

1996-05-01

1998-03-31

Peng, John K.

Television

Format conversion

Conversion between standards with different aspect ratios

348555, 348556, 348558, 348913, 348580, 348581, H04N 701, H04N 546, H04N 1120

Patent

active

057344345

ABSTRACT:
An adaptation of an aspect ratio of a picture signal is effected by providing (1) a second derivative (D2) of an expansion factor (EF) in response to at least one constant value (C1, C2), by providing (3-13) a first derivative (D1) of the expansion factor (EF) in response to the second derivative (D2), by providing (14-21) the expansion factor (EF) in response to the first derivative (D1), and by expanding the picture signal in dependence upon the expansion factor (EF) to adapt the aspect ratio of the picture signal, whereby use of an expansion factor (EF) less than one results in a compression of said picture signal.

REFERENCES:
patent: 4605952 (1986-08-01), Powers
patent: 4654696 (1987-03-01), Dayton et al.
patent: 4760455 (1988-07-01), Nayashima
patent: 5218436 (1993-06-01), Sugiyama et al.
patent: 5229853 (1993-07-01), Myers
patent: 5349548 (1994-09-01), Nillesen

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