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Automatic gain amplifier for biometric sensor device

  • US 6,518,560 B1
  • Filed: 04/27/2000
  • Issued: 02/11/2003
  • Est. Priority Date: 04/27/2000
  • Status: Expired due to Fees
First Claim
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1. A method for implementing an automatic gain amplifier in a biometric sensing device, comprising:

  • sensing biometric information from said biometric sensing device;

    transforming said sensed biometric information into a pixel-based image corresponding to said biometric information;

    counting a frequency of occurrence of pixel-values in said pixel-based image;

    selecting at least two of said counted frequency of occurrence of pixel-values as a first peak and a second peak;

    determining a separation pixel-value between said first peak and said second peak; and

    adjusting a gain amplifier coupled to said biometric sensing device in an iterative manner until said second peak is not less than thirty separation pixel values from said first peak.

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