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Progressive JPEG decoding

  • US 6,259,820 B1
  • Filed: 02/25/1998
  • Issued: 07/10/2001
  • Est. Priority Date: 10/06/1997
  • Status: Expired due to Term
First Claim
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1. An apparatus for generating one or more images at various levels of decompression directly from a fully compressed baseline JPEG encoded image, said apparatus comprising:

  • means for generating a matrix of disjoint subarrays of size n×

    n, each of said subarrays is a two-dimensional DCT of a corresponding subarray of elements from said compressed baseline JPEG encoded image;

    means for extracting one or more elements from each of said disjoint subarrays in accordance with a desired level of decompression and arranging said extracted elements in a predetermined order corresponding to an order of elements in a disjoint subarray from which they were extracted; and

    , means for arranging said extracted elements of predetermined order to generate a decompressed version of said original image, each said decompressed image having an image resolution a fraction of a resolution of an original image.

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