Object based bitstream transcoder
AssigneeMitsubishi Electric Research Laboratories, Inc.
InventorsAnthony Vetro, Huifang Sun, Yao Wang
Life of this patent
Estimating the term…
Abstract
A compressed bitstream is scaled down to a reduced rate bitstream by first demultiplexing a compressed input bitstream to extract video objects as elementary input bitstreams having a first bit rate. A transcoder converts each elementary input bitstream to an elementary output bitstream having a second bit rate. The first bit rate is less than the second bit rate. A transcoding control unit, coupled to the transcoder, supplies control information for the transcoder. A multiplexer composes the elementary output bitstreams into a compressed output bitstream having the second bit rate.
Claims31
An apparatus for converting a compressed bitstream, comprising:
- a demultiplexer to extract each of a plurality of video objects from a compressed input bitstream as an elementary input bitstream having a first bit rate;
- a transcoder to convert each elementary input bitstream to an elementary output bitstream having a second bit rate;
- a transcoding control unit, coupled to the transcoder, to generate control information for the transcoder;
- and
- a multiplexer configured to compose the elementary output bitstreams into a compressed output bitstream having the second bit rate.
A method for converting a compressed bitstream, comprising the steps of:
- extracting each of a plurality of video objects as an elementary input bitstream having a first bit rate from a compressed input bitstream;
- converting each elementary input bitstream to an elementary output bitstream having a second bit rate;
- generating control information for the converting;
- and
- composing the elementary output bitstreams into a compressed output bitstream having the second bit rate.
Dependencies are inferred from the claim text.