High-resolution information storage and retrieval system including electronic refresh buffer

摘要

A high-resolution video filling system making use of a standard low- resolution magnetic tape video recorder for the storage and retrieval of documentary information. In the storage mode, each document to be filed is scanned by a high-resolution video camera to produce a video signal representing a single image frame having a predetermined number of scan lines that is a multiple of the number of scan lines in a standard low- resolution image frame. The image frame signal from the video camera is divided into a series of fields each having a like number of scan lines, the fields being sequentially applied to the recorder to produce on the moving tape thereof a set of parallel transverse tracks one for each field, the set representing a single image frame. In the retrieval mode, the set of tracks representing a selected document is played back by the recorder and written into an electronic refresh buffer whose contents are then repeatedly read out into a high-resolution monitor at a rate producing a flicker-free image of the selected document.