Two-Dimensional Predictive Redundancy in a Television Display

The two-dimensional predictive redundancy of a television picture element is calculated as a function of the preceding point correlation for both interlaced and noninterlaced scanning. The resulting curves level off rapidly when the number of previous points taken into account is increased. This seems to indicate that while appreciable improvement would accrue if preceding point redundancy were used, there would be little more to earn by including the redundancies due to more distant points, especially in view of the necessarily increased complexity of circuitry. An analysis of three-dimensional redundancy would probably result in similar conclusions.