Method and apparatus for transcoding a digitally compressed high definition television bitstream to a standard definition television bitstream
AssigneeKoninklijke Philips Electronics N.V.
InventorsKIRAN S. CHALLAPALI, WEIDONG MAO
Life of this patent
Estimating the term…
Abstract
A method and apparatus for transcoding macroblocks of a high definition television signal to co-sited macroblocks of a standard definition television signal wherein SD macroblocks are derived directly from co-sited HD macroblocks, i.e. without having to compute the SD macroblock information from its corresponding SD image sequence.
Claims4
A method for transcoding a first group of macroblocks of a first digital television signal, to a co-sited macroblock of second digital television signal, said method comprising the steps of:
- a) deriving from each of said first group of macroblocks, corresponding HD macroblock information;
- and
- b) deriving SD macroblock information for said co-sited macroblock directly from said HD macroblock information so as to form said second digital television signal.
An apparatus for transcoding a first group of macroblocks of a first digital television signal, to a co-sited macroblock of second digital television signal, said apparatus comprising:
- a) means for deriving from each of said first group of macroblocks, corresponding HD macroblock information;
- and
- b) means for deriving SD macroblock information for said co-sited macroblock directly from said HD macroblock information so as to form said second digital television signal.
Dependencies are inferred from the claim text.