A method for identifying counterfeit coins, comprising receiving surface image data and edge image data of the coin at a processor. Identifying a plurality of defects using the processor. Comparing each of the plurality of defects to a database of known authentic coin image data defects to determine whether the coin is authentic.

A coin detection antenna includes a substrate and an air core coil in a track shape including a wiring pattern provided on the substrate, and a width of an air core of the air core coil in a short-side direction is equal to or less than twice a thickness of a smallest coin having a smallest thickness of coins to be detected.

A coin detection antenna includes a substrate and an air core coil in a track shape including a wiring pattern provided on the substrate, and a width of an air core of the air core coil in a short-side direction is equal to or less than twice a thickness of a smallest coin having a smallest thickness of coins to be detected.

A method for identifying counterfeit coins, comprising receiving surface image data and edge image data of the coin at a processor. Identifying a plurality of defects using the processor. Comparing each of the plurality of defects to a database of known authentic coin image data defects to determine whether the coin is authentic.

A method for identifying counterfeit coins, comprising receiving surface image data and edge image data of the coin at a processor. Identifying a plurality of defects using the processor. Comparing each of the plurality of defects to a database of known authentic coin image data defects to determine whether the coin is authentic.

A coin detection antenna includes a substrate and an air core coil in a track shape including a wiring pattern provided on the substrate, and a width of an air core of the air core coil in a short-side direction is equal to or less than twice a thickness of a smallest coin having a smallest thickness of coins to be detected.

A method for identifying counterfeit coins, comprising receiving surface image data and edge image data of the coin at a processor. Identifying a plurality of defects using the processor. Comparing each of the plurality of defects to a database of known authentic coin image data defects to determine whether the coin is authentic.

A method for identifying counterfeit coins, comprising receiving surface image data and edge image data of the coin at a processor. Identifying a plurality of defects using the processor. Comparing each of the plurality of defects to a database of known authentic coin image data defects to determine whether the coin is authentic.

A method for identifying counterfeit coins, comprising receiving surface image data and edge image data of the coin at a processor. Identifying a plurality of defects using the processor. Comparing each of the plurality of defects to a database of known authentic coin image data defects to determine whether the coin is authentic.

A method for identifying counterfeit coins, comprising receiving surface image data and edge image data of the coin at a processor. Identifying a plurality of defects using the processor. Comparing each of the plurality of defects to a database of known authentic coin image data defects to determine whether the coin is authentic.