Data distribution mechanism in the form of ink dots on cards

摘要

An improved form of information distribution information distribution medium is disclosed comprising a card on which at least one surface thereof contains distributed information encoded as an array of dots printed on the surface in a fault tolerant manner. Preferably, the array of dots is grouped into a plurality of data segment blocks with each data segment block having a delineated border region for accurately spatially locating the dots. The delineated border region can include a series of periodically spaced markers, the periodicity being substantially twice the pitch of the array of dots. The delineated border region can further include at least one line of dots spaced adjacent to the periodically spaced markers. The periodically spaced markers can comprise substantially 2 or 3 adjacent printed dots. Applications and uses of such-a system are also disclosed.