Method for producing indicators and processing apparatus and system utilizing the indicators

A method for a user reading an image from a selected zone of a surface of an object with an electronic system, the method comprising:

• mapping an indicator information to a graphical indicator that has a visually negligible size, the graphical indicator comprising a plurality of state zones for selectively respectively storing a plurality of graphical micro-units, and each of the state zones selecting a state from at least two candidate states;
• affixing the graphical indicator onto the surface of the object;
• and
• the electronic system retrieving the graphical indicator and outputting an additional information from the graphical indicator;
• wherein the surface of the object comprises a main information which overlaps and co-exists with the graphical micro-units are negligible when the user observes the main information;
• wherein each graphical micro-unit is printed in an ink that substantially absorbs infrared ray, and the main information is printed in an ink that hardly absorbs infrared ray.