Marking preferably binary coded data record involves modifying block for embedding with image points of at least two different color values to only have image points of one color value

摘要

The method involves selecting a block(s) with multiple image points from a data record for embedding at least one additional information item whereby the color value of at least one image point is modified. Blocks with only image points of a first or second color value are allocated a first or second 1-bit switching state. A block for embedding with image points of at least two color values is modified to have image points of one color value. The method involves selecting at least one block (1) with at least one image point, preferably a number of image points, from a data record for embedding at least one additional information item in the data record and whereby the color value of at least one image point of the block is modified. A block with only image points of a first color value is allocated a first 1-bit switching state and a block with only image points of another color value is allocated a second 1-bit switching state. A block for embedding with image points of at least two different color values is modified so that the block only has image points of one color value after modification. Independent claims are also included for the following: (1) a bar code with at least one digital water mark; (2) a fingerprint with a water mark; (3) a method of embedding a digital water mark in a graphical representation of a signature; (4) a signature with a water mark; and (5) a method of increasing data security of data stored on a data medium.