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m →Related technologies: Remove blank line(s) between list items per WP:LISTGAP to fix an accessibility issue for users of screen readers. Do WP:GENFIXES and cleanup if needed. Discuss this at [[Wikipedia talk:WikiProject Accessibility#LIS... |
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*'''Angle modulation of ferromagnetic particles:''' A code is embedded into the magnetic stripe using read and write heads operating diagonally to the direction of swipe in the reader. With appropriate signal processing, these can read and encode a small amount of additional data which is polarised in a different axis to the ISO standard tracks.
*'''Infrared barcodes:''' The second class concerns encoding the code onto the plastic base of the card using special inks (probably a bar code), or reading a code which is inherently embedded as part of the plastic manufacturing process for each batch. Such a code may only be visible under infrared illumination (or other invisible wavelength).
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