From the patent specification:
Limited Very-High-Density (VHD) Embodiment
FIG. 2A depicts six example pairs 201-206 of color blots for use in a limited VHD embodiment of the present invention. Under this embodiment, each of the twenty-six characters of the English alphabet and each of the ten Arabic numerals is assigned to a unique pairing of colors, the colors of which are drawn from a pool of six highly distinguishable colors, such as white, yellow, blue, red, green, and black (treating white and black as “colors”; see, Harrison I for more discussion of light phenomena perceived as colors by humans). Exactly thirty-six such pairings are possible, which allows for an exact match between the number of possible pairings and the number of alphanumeric characters to be assigned. A complete default matrix 211 of relationships between alphanumeric characters and color pairings according to the present invention appears in FIG. 2B.
The highly distinguishable nature and limited number of the colors used in these pairings makes the VHD embodiment more tolerant of deviation from color standards than the UHD embodiment. This enhancement is accompanied by a sacrifice of information density. The basic alphanumeric-only set of characters in this code is well-suited for automatic ID applications.
FIG. 3A depicts an alternate calibration symbol 301 for use in the limited VHD embodiment. While the calibration process is similar to that described above, this calibration symbol may alternately be used, providing four calibration blots in a space that is smaller than the space required for four data blots.
FIG. 3B depicts a chromocode 311 according to the VHD embodiment symbolizing the word “EPOET”.
FIG. 3C depicts a chromocode according to the VHD embodiment of the present invention and including human-readable alphanumeric characters 331-335 superimposed upon one of the two color blots in the color blot pairs representing these characters. It is recommended that the color of the alphanumeric character be of a color that contrasts highly with the color of the color blot against which it is set; compare, Harrison II.