Image information encoding device and method and image information decoding device and method

Image information encoding device and method and image information decoding device and method

  • CN 101,646,085 B
  • Filed: 07/20/2004
  • Issued: 08/10/2016
  • Est. Priority Date: 07/18/2003
  • Status: Active Grant
First Claim
Patent Images

1. the code device that picture signal is encoded, it is characterised in that possess:

  • Predicting unit in image, the chroma format signal of the resolution notationally stating the colour difference signal of picture signal is 4;

    2;

    2In the case of form, color space signal designation YCbCr, in 8 ×

    16 pixels of the block to be arranged 8 ×

    8 pixels at longitudinal directionWhen block unit carries out image intraprediction encoding by DC prediction mode to above-mentioned colour difference signal, it is divided into 8 ×

    8 block of pixels to use topWith the meansigma methods that the pixel of left side adjacent block calculates them, thus generate prognostic chart picture;

    Converter unit, only gather with 4 ×

    4 block of pixels units to by above-mentioned image predicting unit generate prognostic chart picture and artworkThe DC coefficient of the differential signal of picture carry out integer precision discrete cosine transform and obtain 4 ×

    4 pieces and constitute the colourity of 2 ×

    4 piecesDC block, carries out Discrete Hadamard transfer with 2 ×

    4 block units to the colourity DC block constituted;

    Quantifying unit, the conversion carried out according to above-mentioned converter unit adaptively changes quantization method, to above-mentioned converter unit instituteThe conversion coefficient produced quantifies;

    AndCoding unit, the above-mentioned conversion coefficient that above-mentioned quantifying unit is quantified, above-mentioned chroma format signal and above-mentioned colored skyBetween signal encode.

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