Patent ID: 8139066

Claim:
A method of generating and outputting an error quantifying differences between reference objects representing characters and representations of the reference objects, wherein the method includes: accessing a reference object representing a character; quantifying one or more reference object characteristics, the reference object characteristics being related to character structural or color information of at least a portion of the reference object to generate a reference object metric; accessing a representation object of the reference object; quantifying one or more representation object characteristics, the representation object characteristics being related to character structural or color information of a portion of the representation object of the reference object corresponding to the portion of the reference object to create a representation object metric; determining and quantifying physiological characteristics of a user; calculating an error based on a difference between the reference object metric and the representation object metric and which is calculated by at least considering the physiological characteristics of the user as operands within the error calculation; and outputting the calculated error.