Generating a non-reproducible printed image
AssigneeDexrad (Proprietary) Limited
InventorGavin Randall Tame
Life of this patent
Estimating the term…
Abstract
A method of generating a non-reproducable printed image, for example on a cheque, involves printing a first, background layer of ink on the document, and then printing data on top of the background layer. The ink used to print the background layer is reflective of light of a predetermined wavelength, typically in the infra red spectrum. The ink used to print the data is visually indistinguishable from the first ink, but absorbs light in the infra red spectrum, so that when the printed image is illuminated with infra red light, the image can be discerned. The image typically comprises an encrypted symbolic image and is used for security purposes.
Claims20
Method for communicating data via an optimum data path in a network having a plurality of nodes (u, v, a, b, c, d) connected via data links, the method comprising:
- determination of an optimum data path from a sending node (u) to a receiving node (v) by
- determination of all loop-free data paths from the sending node (u) to the receiving node (v) via respective data links and nodes (u, v, a, b, c, d),
- selection of data paths such that all data to be communicated between two nodes are communicated via the same data path,
- determination of maximum link utilizations and average link utilizations, or values indicative of combinations of the maximum link utilizations and the average link utilizations of the selected data paths, and
- defining one of the selected data paths having the minimal maximum link utilization and the minimal average link utilization, or the minimal value indicative of combinations of the maximum link utilizations and the average link utilizations as the optimum data path, and
- communicating data from the sending node (u) to the receiving node (v) via the optimum data path.
System for communication of data in a network via an optimum data path, the system comprising:
- a network having nodes connected by data links, at least one of the nodes being a sending node (u) and at least one of the nodes being a receiving node (v), and
- control means being connected to the network for controlling data communication in the network, characterized in that
- the control means are adapted to carry out a method according to one of the preceding claims.
Dependencies are inferred from the claim text.