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Method and apparatus for encoding a digital image signal

  • US 5,699,475 A
  • Filed: 02/02/1993
  • Issued: 12/16/1997
  • Est. Priority Date: 02/04/1992
  • Status: Expired due to Fees
First Claim
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1. A method for encoding a digital image signal, comprising the steps of:

  • orthogonally transforming said digital image signal into transformed macro blocks containing DC, low frequency AC and high frequency AC components of said digital image signal,encoding an encoding set comprised of a predetermined number of said transformed macro blocks using a variable length code into an amount of encoded data in accordance with a target amount, andforming said encoded data corresponding to an approximately integer number of said transformed macro blocks into a first sync block having a fixed length and also having DC component areas and low frequency AC component areas at predetermined positions and at least one high frequency AC component area at least at one predetermined position, with the encoded data representing said DC and low frequency AC components being in said DC and low frequency AC component areas, respectively, and at least some of the encoded data representing said high frequency AC components being placed in said at least one high frequency AC component area in the first sync block and remaining encoded data representing said high frequency AC components exceeding said fixed length being placed in a second sync block.

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