×

Optical reading system and method of operation

  • US 8,519,321 B2
  • Filed: 11/24/2009
  • Issued: 08/27/2013
  • Est. Priority Date: 02/10/2009
  • Status: Active Grant
First Claim
Patent Images

1. A method of operating a sensor comprising the steps of:

  • capturing a first image with a sensor having an array of pixels;

    generating a first image value from said first image, wherein said first image value is an average of individual pixel values in said array of pixels;

    storing said first image value;

    comparing said first image value to a threshold;

    generating a signal if said first image value exceeds said threshold;

    capturing a second image with said sensor;

    generating a second image value from said second image, wherein said second image value is an average individual pixel values in said array of pixels;

    comparing said second image value to said first image value;

    determining if said first image exceeds said threshold and said second image does not exceed said threshold; and

    generating said signal if said first image exceeds said threshold and said second image does not exceed said threshold;

    reducing power consumption in said sensor after generating said signal;

    setting an interrupt timer before said step of reducing power consumption; and

    ,generating an interrupt signal when said interrupt timer expires.

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