Letterbox television signal with edge regions containing transfo

Details Letterbox television signal with edge regions containing transfo Letterbox television signal with edge regions containing transfo

1992-04-10

1993-12-28

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358167, H04N 704, H04N 700

Patent

active

052744493

ABSTRACT:
In a system for generating a compatible television signal with a "letterbox" display format, groups of vertically arranged picture elements (pels) are subjected to vertical DCT transformation producing eight DCT coefficients. Intermediate sixth and seventh coefficients are placed in the letterbox bar regions. The remaining six coefficients, namely the first through fifth coefficients and the highest frequency eighth coefficient, are inverse DCT transformed and processed with the main image information. A standard aspect ratio receiver displays a letterbox image using only the remaining six coefficients. A wide aspect ratio receiver uses the six remaining coefficients with the two coefficients from the bar regions, after inverse DCT, to produce a full resolution wide aspect ratio image.

REFERENCES:
patent: 4961112 (1990-10-01), Sugimeri et al.
patent: 4984078 (1991-01-01), Skinner et al.
patent: 5097332 (1992-03-01), Faroudja
patent: 5128758 (1992-07-01), Azadegon et al.
Schreiber, William F., "6-MHz Single-Channel HDTV Systems", HDTV Symposium, Ottawa, Oct. 1987, pp. 1-10.
Cucchi et al., "DCT-Based Television Codec for DS3 Digital Transmission", SMPTE Journal, Sep. 1989, pp. 640-646.
"Wide Aspect Screen NTSC Compatible EDTV", by Y. Araki et al., IEEE 1989 Int. Conf. on Consumer Electronics; Digest of Technical Papers, ICCE; Rosemont, Ill., Jun. 6-9, 1989, pp. 8-9.
"Compatible HDTV Coding for Broadband ISDN", by K. Tzou et al., IEEE Global Telecommunications Conf. & Exhibition, Hollywood, Fla., Nov. 28-Dec. 1, 1988; vol. 2, pp. 24.1.1-24.1.7.

Affiliated with

Also associated with

Rating

Letterbox television signal with edge regions containing transfo does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Letterbox television signal with edge regions containing transfo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Letterbox television signal with edge regions containing transfo will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1547066