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Artificial Luminance Decay Technique for Scanned Video Systems

IP.com Disclosure Number: IPCOM000122295D
Original Publication Date: 1991-Nov-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 71K

Publishing Venue

IBM

Related People

Fleischman, RM: AUTHOR [+3]

Abstract

Described is an artificial digital luminance decay technique and hardware implementation for scanned video systems. An inter-field progressive scan line doubling technique is implemented in an artificial phosphor decay circuit so as to improve the video picture quality when motion occurs.

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Artificial Luminance Decay Technique for Scanned Video Systems

      Described is an artificial digital luminance decay
technique and hardware implementation for scanned video systems.  An
inter-field progressive scan line doubling technique is implemented
in an artificial phosphor decay circuit so as to improve the video
picture quality when motion occurs.

      Image quality is considered significant for digital video
systems, such as high density television (HDTV), and is often
referred to as the "Digital Look".  Typically, progressive scan
implementations [*] are used in either line doubling (intra-frame),
or field doubling (inter- frame), progressive scanning circuitry.
Additionally, techniques utilize motion detection information to
switch between inter-field and intra-field processes so as to
eliminate artifacts, such as flicker.  However, difficulties can be
experienced in determining the motion characteristics of the video
frames, and thereby the detection method may select the wrong process
which can lead to artifact generation.

      The concept described herein utilizes digital techniques so
that the effects of phosphor decay can be simulated in a
progressively scanned system.  A circuit is used to improve the
picture quality when the motion occurs so that the picture quality of
the still portions of the picture is improved while the artifacts in
the motion areas of the picture is reduced.  The major differences
between this technique and prior art techniques of using progressive
scanning is that the co...