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Automated detection and correction of eye color defects due to flash illumination

  • US 5,748,764 A
  • Filed: 04/03/1995
  • Issued: 05/05/1998
  • Est. Priority Date: 07/19/1993
  • Status: Expired due to Fees
First Claim
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1. A method of detecting for eye color defects of a subject in a digital image due to flash illumination, comprising the steps of:

  • a) defining a spatial region within the digital image in which one or more eye color defects may exist, which region includes at least a portion of the subject'"'"'s head;

    b) sampling pixels within such spatial region for their color content and comparing each such sample pixel with a plurality of threshold values which are representative of eye color defects to identify possible eye color defect pixels;

    c) segmenting the identified possible eye color defective pixels into one or more spatially contiguous groups;

    d) calculating a first score for each pixel of each segmented group and for each group based upon a plurality of features including group size, group shape, coloration, and brightness to identify eye color defect group candidates;

    e) selecting a seed pixel based on its score from each identified eye color defect group candidate and determining all the neighboring pixels which are within a predetermined score range of their neighboring pixels and those pixels in a group which represent a significant pixel score transition so that the determined transitions identify the outer boundary of an eye color defect group candidate; and

    f) calculating a second score for each pixel for each eye color defect group candidate based on a plurality of features including group size, group shape, coloration, and brightness to determine an actual eye color defect group.

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