Patent ID: 8005148
Filing Date: 2011-08-23
Classification: H04N

Abstract:
1. An encoder for encoding a high-resolution input video bitstream to produce an encoded output bitstream, comprising: an enhancement unit for enhancing (i) a lower-resolution decoded base stream (ii) based on enhancement control parameters; a first picture content parameter unit for extracting at least one picture content parameter from the enhanced lower-resolution decoded base stream; a second picture content parameter unit for extracting at least one picture content parameter from the input video bitstream; comparison means for comparing the enhanced lower-resolution decoded base stream picture content parameters with the input video bitstream picture content parameters; a control unit for receiving an output from the comparison means, and for calculating said enhancement control parameters which will minimize the difference between the input video bitstream picture content parameters and the enhanced lower-resolution decoded base stream picture content parameters; and means for incorporating the calculated enhancement control parameters into the encoded output bitstream.