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Perfecting the effect of flash within an image acquisition devices using face detection

  • US 7,822,235 B2
  • Filed: 04/05/2010
  • Issued: 10/26/2010
  • Est. Priority Date: 06/26/2003
  • Status: Expired due to Term
First Claim
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1. Within a digital camera, a method of digital image processing using face detection for achieving a desired image parameter, comprising:

  • identifying a group of pixels that correspond to a face in a foreground region within a digital image taken with flash;

    determining first initial values of relative exposure of pixels of the group of pixels;

    determining second initial values of relative exposure of pixels other than pixels of the group of pixels and located within a background region of the digital image;

    comparing the first and second initial values, respectively, with a desired relative exposure of pixels based on known flash characteristics and with one or more desired relative exposures of background region pixels; and

    determining adjusted values of relative exposure separately for the foreground and background regions based on the comparing of the first and second initial values with a desired relative exposure of pixels based on known flash characteristics and with a desired relative exposure of pixels within said background region, and on a comparison of relative exposures corresponding to the first and second initial values.

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