An Experimental Approach to Video Bandwidth Compression by Multiplexing
D. Seitzer, F. Closs, P. Stucki · IRE Transactions on Communications Systems · 1969
A system is described, which is based on structural and perceptual redundancy. It employs the idle periods of one picture to introduce information from other pictures and integrates over several TV frames. The system is capable of multiplexing 15 high-resolution black and white TV channels.