Letter-box screen detection apparatus

Details Letter-box screen detection apparatus Letter-box screen detection apparatus

1997-10-07

1999-10-26

Hsia, Sherrie

Television

Basic receiver with additional function

Multimode

348913, H04N 546

Patent

active

059737492

ABSTRACT:
The DC level of the low-frequency component of a horizontal frequency is detected from a video signal by a horizontal low pass filter (LPF) 16d and a DC value detection circuit. In addition, the high-frequency component of the horizontal frequency is detected from the video signal by a horizontal band pass filter (BPF) and a nonlinear circuit. Furthermore, a high-frequency component in the vertical direction is detected from the video signal by a vertical BPF 16i and a nonlinear circuit 16i. On the basis of three detection results, the presence/absence of a non-image portion of the video signal is determined by a determination circuit.

REFERENCES:
patent: 5309234 (1994-05-01), Kranawetter
patent: 5486871 (1996-01-01), Filliman

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