Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1987-12-29
1991-06-18
Shepperd, John W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358141, H04N 704, H04N 1100, H04N 1112
Patent
active
050253093
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention concerns a widescreen extended definition television (EDTV) system which is operable with a single broadcast channel and which is compatible with conventional television receivers having a relatively smaller display aspect ratio.
A conventional television receiver, such as a receiver in accordance with NTSC broadcast standards adopted in the United States and elsewhere, has a 4:3 aspect ratio (the ratio of the width to the height of a displayed image). Recently, there has been interest in using higher aspect ratios for television receiver systems, such as 2:1, 16:9 or 5:3, since such higher aspect ratios more nearly approximate or equal the aspect ratio of the human eye than does the 4:3 aspect ratio of a conventional television receiver. Video information signals with a 5:3 aspect ratio have received particular attention since this ratio approximates that of motion picture film, and thus such signals can be transmitted and received without cropping the image information. However, widescreen television systems which simply transmit signals having an increased aspect ratio as compared to conventional systems are incompatible with conventional aspect ratio receivers. This makes widespread adoption of widescreen systems difficult.
It is therefore desirable to have a widescreen system which is compatible with conventional television receivers. One such system is disclosed in a copending U.S. patent application of C. H. Strolle et al., Ser. No. 078,150 titled "Compatible Widescreen Television System", filed July 27, 1987.
It is even more desirable to have such a compatible widescreen system with provisions for enhancing or extending the definition of the displayed image so as to provide extra image detail. For example, such widescreen EDTV (extended definition television) system may include apparatus for providing a progressively scanned image.
In accordance with the principles of the present invention, there are disclosed herein method and apparatus for encoding and decoding a compatible EDTV widescreen video signal representing a high resolution picture with an aspect ratio greater than the standard 4:3 aspect ratio, suitable for transmission via a single standard broadcast channel.
SUMMARY OF THE INVENTION
In a disclosed preferred embodiment of a compatible widescreen EDTV television system in accordance with the principles of the present invention, an original high resolution, progressively scanned widescreen signal is encoded to include four components derived from a composite signal. The four components are processed separately before being recombined in a single signal transmission channel.
A first component is a main 2:1 interlaced signal with a standard 4:3 aspect ratio. This component comprises a central portion of the widescreen signal that has been time expanded to occupy nearly the entire 4:3 aspect ratio active line time, and side panel horizontal low frequency information that has been time compressed into the left and right horizontal image overscan regions where such information is hidden from view in a standard television receiver display.
A second component is an auxiliary 2:1 interlaced signal comprising left and right side panel high frequency information that have each been time expanded to half the active line time. Thus expanded side panel information occupies substantially the entire active line time.
A third component is an auxiliary 2:1 interlaced signal, derived from the widescreen signal source, comprising high frequency horizontal luminance detail information between approximately 5.0 MHz and 6.2 MHz.
A fourth component is an auxiliary 2:1 interlaced "helper" signal comprising vertical-temporal (V-T) luminance detail information that would otherwise be lost in the conversion from progressive scan to interlaced format. This signal component helps to reconstruct missing image information and to reduce or eliminate unwanted flicker and motion artifacts at a widescreen EDTV receiver.
At a widescreen EDTV receiver, a composite signal contai
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Fukinuki et al., Experiments on Propo
Herrmann Eric P.
Kurdyla Ronald H.
RCA Licensing Corporation
Shepperd John W.
Tripoli Joseph S.
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