Average luminance level detection apparatus and aspect ratio aut

Details Average luminance level detection apparatus and aspect ratio aut Average luminance level detection apparatus and aspect ratio aut

1995-12-08

1997-11-11

Lee, Michael H.

Television

Basic receiver with additional function

Multimode

348913, 348556, H04N 546

Patent

active

056869703

ABSTRACT:
A high precision aspect ratio auto-discrimination apparatus used for display apparatuses and television receivers comprising: an apparatus for detecting the upper edge and lower edge of a letter box picture through detecting the average luminance of every horizontal scan period; an apparatus for detecting respective average luminance levels in a plurality of specific regions in one field picture controlled by a horizontal synchronous signal and a vertical synchronous signal; and, an aspect ratio discrimination section to which the outputs of said both apparatuses are input.

REFERENCES:
patent: 5420644 (1995-05-01), Watanabe

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