Means for improving apparent television resolution
Edwin H. Hilborn, Lloyd E. Stevenson · Information Display · 1967
A means is described for improving the apparent resolution of a television system without an increase in bandwidth. The technique depends on the short term temporal integration characteristics of the observer's visual system and involves a minimum of electronics. By use of a suitable switching time delay in one of the oscillators, the raster lines are displaced by a discrete fraction of the height of one line at the start of each frame, while maintaining precise interlace at both camera and monitor throughout both fields of the frame. Tests for accuracy of recognition of random alphabetic characters indicated improvements over a standard raster scan as great as 75% for the smallest characters employed.