Error metrics for characters

A computer readable storage medium comprising stored computer executable instructions that when executed by a processor are configured to perform a method of generating an error from an error metric quantifying differences between reference objects representing characters and representations of the reference objects, the method comprising:

• 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.

A method of generating 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 a plurality of different object characteristics, the reference object characteristics being related to different character structural or color information of the reference object;
• assigning weights to the quantified object characteristics and generating a corresponding reference object metric from the weighted and quantified object characteristics;
• accessing a representation object of the reference object;
• quantifying a plurality of representation object characteristics, the representation object characteristics being related to character structural or color information of the representation object of the reference object;
• assigning weights to the quantified object characteristics and generating a corresponding reference object metric from the weighted and quantified object characteristics;
• calculating an error based on a difference between the reference object metric and the representation object metric;
• and
• outputting the calculated error.