The playing card reader eye lens is a kind of spy eye which can be used to see invisible marks on cheating playing cards. Its appearance is similar to a regular contact lens, but its function is quite different. It is specially designed to see the invisible ink marks on the back of cheating cards. The invisible ink markings on cheating cards cannot be seen by the naked eye, so you need a pair of special marked cards reader eye lenses to see them clearly.
It uses Infrared light to view the card, and its radiation is absorbed by the luminous ink on the back of the cheating cards. After filtered by the cover and cutoff filter, the IR image data is captured by a camera element in the unit. This information can be read and displayed to a game control system that is connected to the camera element.
In a typical system, the IR images are processed by a computer within the camera element to determine whether a playing card has been tampered with. In a more sophisticated system, the camera elements may be configured to also inspect a card to determine whether it has been scratched or torn in any way. The IR image data of the card can be further analyzed to determine its suit and/or rank.
As the light enters the card, it is reflected by the surface of the card and transmitted to a sensor located within the delivery shoe tray (or shuffler delivery tray). The filtered IR image data can then be sent to a game control system via a wired or wireless network.
If the tampered card is detected by the camera system, the camera element will be turned on or off to determine the type of defect that has been detected. In a more sophisticated system, the cameras can be programmed to detect specific types of defects such as scratches and pinholes, which are detected by their shadow or reflectance in the filtered IR images.
The filtered IR image data can be further analyzed to determine whether the tampered card has been scratched or torn. The filtered IR image data of the card can be used to further determine its suit and/or rank.
Using X-ray to view the card is an alternative to UV or infrared poker camera, but it has a few drawbacks that make this method less desirable for use in professional table games of chance with playing cards. One is that X-ray imaging of the cards would be very difficult to do, and X-ray scanning of the card’s front and back may be impossible for a camera system that is not positioned near the card face or indexes.
Another concern is that X-ray images of the cards may be distorted by the glare of the environment. It is not uncommon for X-ray images to be distorted by reflections from other objects such as tables, chairs, and the human body.