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Prediction apparatus and method for improving coding efficiency in scalable video coding

  • US 6,043,846 A
  • Filed: 11/15/1996
  • Issued: 03/28/2000
  • Est. Priority Date: 11/15/1996
  • Status: Expired due to Fees
First Claim
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1. A prediction method for improving coding efficiency by reducing temporal redundancy in an enhancement error signal of a multiple layer video encoding system, the prediction method comprising:

  • dividing an input video sequence into a plurality of video object layers each consisting of a base layer and several enhancement layers, and each of the video object layers are further made up of a series of video object planes (VOP) comprising a two dimensional array of sampled pixel data at a particular time reference;

    encoding a VOP of the base layer to obtain a compressed bitstream and a corresponding locally decoded VOP of the base layer;

    obtaining a pixel classification criteria from information in current and previous locally decoded VOP of the base layer;

    constructing a merged VOP, from a previous locally decoded VOP of an enhancement layer, the previous locally decoded VOP of the base layer, the current locally decoded VOP of the base layer and the pixel classification criteria;

    predicting an enhancement layer VOP from;

    the merged VOP, the previous VOP in the same layer, and the VOP from the base layer with the same time reference;

    entropy coding information for prediction modes as header information for the decoder;

    coding prediction errors of the enhancement layer VOP which was predicted according to one of several prediction modes based on a mode decision, together with motion vector information, and transmitting them in a compressed bitstream to a decoder; and

    repeating the above prediction steps on the enhancement layers treating a lower of two enhancement layers as the base layer.

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