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Method for detecting and correcting defective pixels in a digital image sensor

  • US 7,283,164 B2
  • Filed: 09/18/2002
  • Issued: 10/16/2007
  • Est. Priority Date: 09/18/2002
  • Status: Active Grant
First Claim
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1. A digital image sensor for detecting and correcting sensor values from defective pixels in an image, comprising:

  • an array of pixels arranged in rows and columns, each of said pixels in said array of pixels producing a respective sensor value for an image;

    a buffer for storing at least part of said sensor values produced by at least one of said rows of said pixels for said image, one of said sensor values being a current sensor value in a first color plane produced by a current one of said pixels; and

    a processor connected;

    (1) to receive said sensor values stored in said buffer, (2) to compute one or more gradients from said sensor values in at least a second color plane and (3) to calculate a range of values corresponding to said current pixel based on said sensor values produced by neighboring ones of said pixels in said first color plane and a threshold amount using said one or more gradients and said range of values, the range of values including at least a maximum range value and a minimum range value,wherein the processor determines whether said current pixel is defective responsive to the current pixel value being one of;

    (i) greater than said maximum range value of the range of values by more than said threshold amount or (ii) less than said minimum range value of the range of values by more than said threshold amount.

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