There is provided a code pattern readable by a reader having a given number of dots that are selectively arranged in a block that is an information unit.

Method and device for checking patterns (1) disposed on a material strip (30) which patterns (1) consist of groups of dark and light areas (2,2*,3,3*) succeeding in the travelling direction (v) of the material strip (30) and the checking respectively, by displacing the position of the dark areas (2,3) and/or the light areas (2*,3*) of one group with respect to a related detector (8,9) in regard to the dark areas (2,3) and/or light areas (2*,3*) of another group with respect to another related de...

A method is provided for encoding two-dimensional frame codes comprising the steps of establishing first and second line bit sequences, determining an exclusive OR (XOR) logic value of the first and second code lines to obtain a two-dimensional matrix of XOR logic values and determining the two-dimensional frame codes using the matrix of XOR logic values.

A specific bit pattern (or set of bit patterns) that have particular frequency and length requirements is used to remove low-frequency, visually observable structure from rendered embedded digital data. In use, the pattern is replicated enough times to be able to XOR with the data before rendering as glyphs, or the like. On decoding (reading), the read data is XOR'd again to recover the original data.

A stereo code which can display a large amount of information on a small area without impairing the beauties of the goods etc. is provided, the stereo code comprising: a first stage information displaying region as a basic shape, comprising an inlaying body made up of a first rectangle having a prescribed area and displaying code information, and an inlaid body which is a second rectangle having an area half the first rectangle placed such that each intersection point of each two side constructi...

A great number of bar codes are recorded in dual directions on a bar code information card. Each bar code is comprised of a plurality of bar symbols juxtaposed in parallel to each other. A plurality of bar codes, constituting one group bar code, are arranged in one direction which is orthogonal to the bar symbol and a plurality of group bar codes are arranged in the other direction in which the bar symbol extends. A great deal of bar-coded information is recognized by transferring the bar code i...

A merchandising coupon having a coded information track comprising a pair of substantially parallel rows of adjacent portions of contrasting character (for example, black and white), the portions of the first of said rows serving as a timer track, and the portions of the second of said rows serving as an information track; the contrasting portions of the first row being symmetrically and uniformly spaced to serve as a timing or clocking track, and the contrasting portions of the second row being...

The characters of this record are made up of varying numbers of straight bars placed side by side. The bars are in positions selected among equally spaced bar positions. They are arranged in a binary code and bars in alternate positions in the character space may be displaced heightwise with respect to the other bars for further distinction.

The present invention relates to linking documents through digital watermarking. In one implementation, an identification document is embedded with a first digital watermark. The first digital watermark includes a first identifier. Before issuing a second document, like a boarding pass or ticket, the first identifier is extracted from the identification document. The first identifier is manipulated or altered to produce a second identifier. The second identifier, however, remains related to the ...

A method and device for printing a franking mark on a document by making available a unique bit string; establishing an identification code; and securely printing the franking mark on the document. The franking mark at least includes information relating to the bit string and the identification code. The bit string is selected from a centrally stored set of unique bit strings, and the unique bit strings which are made available for use are centrally registered.