×

Multi-color information encoding system

  • US 5,369,261 A
  • Filed: 02/12/1992
  • Issued: 11/29/1994
  • Est. Priority Date: 02/12/1992
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method for machine-reading data encoded on a medium having a number of regions, each region having a spot with one of a plurality of hues and one of a plurality of intensity levels, wherein the number of regions includes data regions and reference regions, the reference regions having respective predetermined reference hue and respective predetermined reference intensity, the method comprising the steps of:

  • determining the hues and the intensity levels of the data regions;

    determining the hues and the intensity levels of the reference regions;

    comparing the determined hues and intensity levels of the reference regions with the corresponding predetermined reference hues and the predetermined reference intensity levels;

    determining an error factor based at least in part on the difference between the determined hue and intensity of at least one reference region and the predetermined reference hue and predetermined reference intensity of at least one reference region; and

    applying a correction factor to the determined hue and intensity of at least one data region to obtain an adjusted hue and/or an adjusted intensity, wherein the correction factor is derived at least in part from the error factor.

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