Method and apparatus for compressing and decompressing a digital video signal using predicted and error images

  • US 5,134,478 A
  • Filed: 05/23/1991
  • Issued: 07/28/1992
  • Est. Priority Date: 02/19/1991
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of encoding a sequence of frames of a digital motion video signal, said sequence of frames having an initial frame and at least one subsequent frame, said method comprising the steps of:

  • a- selecting the initial frame of said sequence of frames of said digital motion video signal as a first target image for processing;

    b- resolving said first target image into at least one lower level of resolution;

    c- selecting at least one lower level of resolution of said first target image for encoding;

    d- forming an encoded target image by encoding said at least one selected level of resolution;

    e- forming a previous target image by storing said first target image in first storage means;

    f- forming a previous reconstructed image by storing a reconstructed image in second storage means;

    g- selecting a subsequent frame from said sequence of frames as a target image;

    h- providing at least one displacement vector representing the magnitude and direction of the displacement between at least one region in the target image being processed and a corresponding region in said previous target image;

    i- applying said at least one displacement vector to a corresponding region in said previous reconstructed image to form a predicted image;

    j- encoding said at least one displacement vector;

    k- subtracting pixel values in the predicted image from corresponding pixel values in said target image to form an error image;

    l- resolving said error image into at least one lower level of resolution;

    m- selecting at least one lower level of resolution of said error image for encoding;

    n- forming an encoded error image by encoding said at least one selected level of resolution;

    o- forming a new previous target image by storing said target image being processed in said first storage means in place of the target image stored in step e;

    p- forming a new previous reconstructed image by storing a new reconstructed image in said second storage means in place of the reconstructed image stored in step f; and

    q- repeating steps g through p for subsequent images in said sequence of frames.

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