Aspect ratio discrimination apparatus and image display apparatu

Television – Basic receiver with additional function – Multimode

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

348556, 348913, H04N 546

Patent

active

059494948

ABSTRACT:
An aspect ratio discrimination apparatus and an image display apparatus which prevent a malfunction in discrimination of a first video signal for exhibition of a normal image and a second video signal for exhibition of a horizontally elongated image. An upper-lower portion average brightness calculation section receives an input video signal to form an image and calculates an average brightness of upper and lower portions (black band portions) of the image. An upper-lower portion brightness difference calculation section calculates differences between the average brightness and brightness levels of the black portions of the image. A high brightness difference rate detection section discriminates whether or not the rate of the area of portions in the black portions in which the brightness differences are higher than a predetermined level is higher than a predetermined value. When the rate of the area is higher than the predetermined value, it is discriminated that the video signal inputted to the aspect ratio discrimination apparatus or the image display apparatus has the aspect ratio of 4:3.

REFERENCES:
patent: 5581304 (1996-12-01), Wang
patent: 5614956 (1997-03-01), Matsuura
patent: 5659369 (1997-08-01), Imaiida
patent: 5686970 (1997-11-01), Tani et al.
patent: 5719636 (1998-02-01), Ishii et al.
patent: 5784117 (1998-07-01), Mitarai et al.
N. Nakagaki et al., Wide Aspect TV Receiver With Aspect Detection and Non-linear Control for Picture Quality, IEEE Transactions on Consumer Electronics, vol. 40, No. 3, Aug. 1994.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Aspect ratio discrimination apparatus and image display apparatu does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Aspect ratio discrimination apparatus and image display apparatu, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Aspect ratio discrimination apparatus and image display apparatu will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1809340

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.