×

Dark current subtraction with abbreviated reference cycles and recursive filtering

  • US 5,408,314 A
  • Filed: 02/24/1993
  • Issued: 04/18/1995
  • Est. Priority Date: 02/24/1993
  • Status: Expired due to Term
First Claim
Patent Images

1. A signal correction method comprising:

  • providing a flow of light to a photoelectric conversion device;

    alternately conducting and interrupting the flow of light to the device;

    generating an intermixed signal by means of the device while conducting the flow of light to the device, the intermixed signal including a desired signal intermixed with an unwanted dark signal, the desired signal being generated by the device in response to conducting the flow of light to the device;

    generating a dark signal alone by means of the device while interrupting flow of the flow of light to the device;

    filtering the dark signal alone to produce a filtered dark signal; and

    subtracting the filtered dark signal from the intermixed signal to produce a corrected signal, which is representative of the desired signal.

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