Method for retrieving audio signal stored on photograph

Abstract

A method of decoding coded data provided on a photograph using a reader includes steps of irradiating an image-side of the photograph from a first end thereof to an opposing second end thereof with infra-red illumination; receiving infra-red illumination reflected from the image; processing the reflected infra-red illumination to locate within the photograph a first target boundary; processing the reflected infra-red illumination received after location of the first target boundary to obtain audio data; storing the audio data in a memory; processing the reflected infra-red illumination to locate within the image a second target boundary downstream of the first target boundary; ceasing the processing of the reflected infra-red illumination to obtain coded data upon location of the second target boundary; and decoding the audio data stored in the memory to obtain an audio signal.

Dependencies are inferred from the claim text.