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Imaging systems with reference pixels for image flare mitigation

  • US 9,224,782 B2
  • Filed: 08/20/2013
  • Issued: 12/29/2015
  • Est. Priority Date: 04/19/2013
  • Status: Active Grant
First Claim
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1. A method for operating an imaging system having processing circuitry and an array of image sensor pixels, wherein the array of image sensor pixels includes a reference pixel, the method comprising:

  • with the array of image sensor pixels, receiving direct image light and stray light;

    with the image sensor pixels, generating pixel values in response to the direct image light and the stray light;

    with the reference pixel, generating a reference pixel value primarily in response to the stray light; and

    with the processing circuitry, adjusting the pixel values generated by the image sensor pixels based on the reference pixel value generated by the reference pixel, wherein adjusting the pixel values comprises;

    determining whether the pixel values comprise a texture area; and

    in response to determining that the pixel values comprise a texture, performing veiling glare compensation operations on the pixel values.

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