| 摘要 |
PURPOSE:To protect secret information carried on a film by reading a picture only when a key word stored when a detected discrimination smybol coincides with memory contents is inputted. CONSTITUTION:A characteristic number and a key word which correspond to a secret picture are registered. When a characteristic number and a key word are inputted at an input part 13, the characteristic number is stored temporarily in a buffer part 14. A control part 16 collates the read characteristic number with that registered previously in a correspondence table part 15 and when the both coincide with each other, the key word is collated similarly. When the key word is coincident, motors 6 and 7 are driven to project prescribed picture data on a screen 12. When the collated key word is not coincident, reading operation is not performed and said projection on the picture is not performed. Thus, the reading operation is restricted to protect secret information carried on a microfilm. |
