Self-Calibration
AssigneeIngenia Holdings (UK) Limited
InventorRussell Paul Cowburn
Life of this patent
Estimating the term…
Abstract
Mitigation of processing artefacts caused by surfaces with high contrast printing or colouring transitions within a system to compare signatures derived from inherent physical surface properties of different articles to authenticate or validate articles and within a system to generate signatures from inherent physical surface properties of different articles.
Claims22
A method of performing a comparison between fuzzy data signatures, the method comprising:
- performing a cross-comparison between a test signature and each of a plurality of record signatures;
- and
- determining whether the test signature matches one of the plurality of record signatures using a self-calibrating method which utilises a measure of the randomness of each signature bit.
A method of generating a signature for an article, the method comprising:
- sequentially directing a coherent beam onto each of a plurality of different regions of the article;
- collecting a set comprising groups of data points from signals obtained when the coherent beam scatters from the different regions of the article, wherein different ones of the groups of data points relate to scatter from the respective different regions of the article;
- and
- determining a signature for the article from the set of groups of data points, the determining comprising capping the magnitude of large magnitude intensity signal transitions and using the capped magnitude data for determining the signature.
Apparatus operable to perform a comparison between fuzzy data signatures, the apparatus comprising:
- a cross-comparison unit configured to perform a comparison between a test signature and each of a plurality of record signatures;
- and
- a determining unit configured to determine whether the test signature matches one of the plurality of record signatures using a self calibrating approach by utilising a measure of the randomness of each signature bit to perform the determination.
Apparatus for generating a signature for an article, the apparatus comprising:
- a source operable to sequentially direct a coherent beam onto each of a plurality of different regions of the article;
- a detector operable to collect a set comprising groups of data points from signals obtained when the coherent beam scatters from the different regions of the article, wherein different ones of the groups of data points relate to scatter from the respective different regions of the article;
- and
- a determiner operable to determine a signature for the article from the set of groups of data points, the determiner operable to cap the magnitude of large magnitude intensity signal transitions and to use the capped magnitude data for determining the signature.
Dependencies are inferred from the claim text.