Coded playing cards and other standardized documents

作者： Jack A. Soules , Bryan A. Carpenter

DOI:

关键词: Card stock 、 Visible range 、 Identification (information) 、 Engineering 、 Reading (computer) 、 Computer graphics (images) 、 Code (cryptography) 、 Playing card

摘要: An apparently conventional playing card (10) is invisibly coded so that it can only be read face down, by an electro-optic reading means. The may of non-laminated stock which has a substantially white surface conventionally printed with the identification suit and value inks chosen because they are visible but transparent to wavelengths outside range. indicia inklessly marked across its compound absorbs (outside range) used means indicia. indicia, invisible human eye, correspond code (11) uniquely identifies card. laminated from top base sheets concealed behind front sheet.