Appeal No. 1998-0884 Page 2
Application No. 08/084,642
The invention at issue in this appeal relates to
predictive encoding of a television picture. By reducing
temporal redundance between successive television pictures,
predictive encoding avoids the need to transmit a picture in
its entirety. More specifically, corrections are applied to a
previously encoded picture to obtain a current picture.
Frame-based motion compensation and field-based motion
compensation are known types of predictive encoding.
In the invention, a television picture is treated as a
mosaic of areas. Each area is predictively encoded using
either frame-based motion compensation or field-based motion
compensation, depending on which will produce the least amount
of motion compensation data. Frame-based predictive encoding
typically is used for areas that are stationary during a
sequence of pictures. Field-based predictive encoding
typically is used for areas exhibiting movement in the series
of pictures. The type of orthogonal transformation is
selected to match the type of predictive encoding. Such
selection simplifies the construction of an encoder according
to the invention.
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