IMAGE ENCODING DEVICE, IMAGE DECODING DEVICE, IMAGE ENCODING METHOD AND IMAGE DECODING METHOD

  • US 20090003441A1
  • Filed: 10/30/2007
  • Published: 01/01/2009
  • Est. Priority Date: 06/28/2007
  • Status: Active Grant
First Claim
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1. An image decoding device for receiving a bit stream obtained by compression-encoding a color moving image signal composed of a plurality of color components as an input and selectively applying one of intra decoding and motion compensation prediction decoding for each of the plurality of color components of the color moving image signal to decode the color moving image signal, comprising:

  • a color component identifying unit for decoding a color component identification flag for identifying the color component to which the input bit stream belongs and determining the color component whose encoded information is contained in the bit stream;

    a decoding unit for decoding information obtained by encoding a prediction mode indicating a predicted image generating method used for encoding each encoding unit area, corresponding prediction overhead information and a prediction error from the bit stream for each color component determined by the color component identifying unit according to a predetermined syntax for the encoding unit area;

    a predicted image generating unit for generating a predicted image for a signal of the encoding unit area based on the decoded prediction mode and the corresponding prediction overhead information;

    a prediction error decoding unit for decoding a prediction error signal based on the information obtained by encoding the prediction error; and

    an adder unit for adding an output from the predicted image generating unit and an output from the prediction error decoding unit, wherein the decoding unit decodes a prediction information encoding indication flag indicating one of use of the prediction mode used for encoding and corresponding prediction overhead information in an area to be encoded of another color component constituting the same screen at the same image position and use of its own prediction mode and corresponding prediction overhead information for the color component to determine the prediction mode used in the predicted image generating unit and the corresponding prediction overhead information based on a value of the prediction information encoding indication flag.

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