Methods and a computing device for determining whether a mark is genuine

The method of 9, wherein

• creating the spatial frequency spectrum correlation profile comprises:
• mapping the first correlation score to a first band-pass filter of the first spatial frequency band;
• and
• mapping the second correlation score to a second band-pass filter of the second spatial frequency band, and
• determining whether the candidate mark is genuine comprises analyzing the mapped correlation scores and spatial frequency bands.

A computing device comprising a hardware processor that carries out actions comprising:

• receiving an image of a candidate mark;
• using the received image, making a plurality of measurements of a feature of the candidate mark;
• creating a profile for the feature based on the plurality of measurements;
• creating a first filtered profile for the feature by filtering, from the profile of the feature, all spatial frequency components except for those in a first spatial frequency band;
• creating a second filtered profile for the feature by filtering, from the profile of the feature, all spatial frequency components except for those in a second spatial frequency band;
• comparing the first filtered profile of the feature with an equivalent first filtered profile of a feature of a genuine mark;
• comparing the second filtered profile of the edge with an equivalent second filtered profile of a feature of the genuine mark;
• determining whether the candidate mark is genuine based on the first filtered profile comparison and the second filtered profile comparison;
• and
• indicating a result of the determination to a user,
• wherein the first spatial frequency band contains a first range of spatial frequencies and the second spatial frequency band contains a second range of spatial frequencies, and
• wherein the second range is different from the first range.

A non-transitory computer-readable medium having stored thereon computer-executable instructions for carrying out actions comprising:

• receiving an image of a candidate mark;
• using the received image, making a plurality of measurements of a feature of the candidate mark;
• creating a profile for the feature based on the plurality of measurements;
• creating a first filtered profile for the feature by filtering, from the profile of the feature, all spatial frequency components except for those in a first spatial frequency band;
• creating a second filtered profile for the feature by filtering, from the profile of the feature, all spatial frequency components except for those in a second spatial frequency band;
• comparing the first filtered profile of the feature with an equivalent first filtered profile of a feature of a genuine mark;
• comparing the second filtered profile of the edge with an equivalent second filtered profile of a feature of the genuine mark;
• determining whether the candidate mark is genuine based on the first filtered profile comparison and the second filtered profile comparison;
• and
• indicating a result of the determination to a user,
• wherein the first spatial frequency band contains a first range of spatial frequencies and the second spatial frequency band contains a second range of spatial frequencies, and
• wherein the second range is different from the first range.