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Size reduction method and device for compressed images

  • US 6,931,159 B2
  • Filed: 02/28/2002
  • Issued: 08/16/2005
  • Est. Priority Date: 02/28/2002
  • Status: Active Grant
First Claim
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1. A method of reducing the size of an input image to a target size by using a quality scaling factor to reduce image quality, wherein the size reduction is effected by a reduction factor estimated from the quality scaling factor and image statistics inherent to the input image, said method comprising the steps of:

  • selecting a range of quality scaling factors based on the target size;

    obtaining a range of reduction factors based on the selected range of quality scaling factors for determining a quality-size relationship;

    computing an estimated quality scaling factor corresponding to the target size based on the quality-size relationship;

    obtaining an estimated reduction factor based on the estimated quality scaling factor for providing a difference between the target size and the size reduction effected by the estimated reduction factor; and

    refining the range of the quality scaling factors for reducing the difference until the difference falls within a predetermined limit.

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