×

Fixed pattern noise subtraction in a digital image sensor

  • US 7,280,141 B1
  • Filed: 09/23/2003
  • Issued: 10/09/2007
  • Est. Priority Date: 09/23/2003
  • Status: Active Grant
First Claim
Patent Images

1. A method for subtracting fixed pattern noise in a digital imaging system incorporating a digital image sensor, comprising:

  • acquiring a reference image of the digital image sensor when the digital image sensor receives no illumination;

    storing a reference value of an operating parameter associated with the reference image, wherein the reference image is indicative of the fixed pattern noise associated with the digital image sensor when the operating parameter has the reference value;

    storing a model describing the behavior of the fixed pattern noise as a function of the operating parameter;

    acquiring a first image;

    measuring a current value of the operating parameter associated with the first image;

    calculating a noise prediction image by extrapolation of the reference image in accordance with the model and based on the current value and the reference value of the operating parameter; and

    subtracting the noise prediction image from the first image to generate a final image.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×