METHOD OF INTERFERENCE-FREE WRITING AND READING OF CODE INFORMATION Russian patent published in 2012 - IPC G06K7/10 G06K1/12 

FIELD: information technology.

SUBSTANCE: method for interference-free writing and reading of code information, involving making micro-irregularities on the surface of an object, then a code structure consisting of marking labels, projecting probing radiation onto the code structure, and recording an image, wherein diffusely reflecting micro-irregularities are randomly and uniformly deposited on the surface of the object, the micro-irregularities on the surface of the object are fused with a laser beam to form a light-absorbing layer, marking labels are made from the fused micro-irregularities, probing radiation is projected onto the code structure at an angle of incidence which provides maximum contrast between the background and the label in the image recorded at the given angle.

EFFECT: stronger surface of the recorded code.

6 cl, 1 dwg