MANUFACTURE OF PERSONAL INFORMATION RECORDING CARD BY FREQUENCY CONVERSION OF MULTIPLE IMAGE AND ITS READER

摘要

PROBLEM TO BE SOLVED: To provide a personal information recording card which has the convenience of bar codes and the image characteristic of a hologram and is optimum for protection of the information privacy by using image frequency card as the personal information recording card. SOLUTION: An image frequency card is used as a personal information recording card where only the signal theat shows the phase numerical value of frequency is exposed to the outside. Thus it is impossible to restore and show an image to the outside by the personal information recording card only. An image base code is recorded on the recording card and then divided into a phase function and an amplitude function through the frequency conversion of the image. These divided codes are recorded on the different cards, that is, a phase card and an amplitude card are offered to a user and a system operator respectively. Then an image code is reproduced when the data are inputted from both cards.