Patent attributes
An apparatus to perform or control obtaining or causing obtaining an image of at least a part of a surface of a sealed unit. The apparatus derives or causes to derive a representation of the at least a part of the surface from the image. The representation includes a set of values representing height levels of corresponding sections of the part of the surface. The apparatus generates or causes generating a string of characters based on the representation of the part of the surface. The string of characters includes a first portion representative of the set of height levels and a second portion generated based on a function of the representation and/or of the first portion of the string of characters. The apparatus associates or causes associating information representing the string of characters with identification information of the sealed unit.
