Pseudorandom scanning

Pseudorandom scanning has been ingenuously used by S. Deutsch ["Narrow-band TV uses pseudorandom scan," Electronics, vol. 35, pp. 49-51, April 27 1962] to reduce television frame rate and hence bandwidth. In this communication we shall consider the use of pseudorandom scanning in transmitting still (rather than motion) pictures. We assume thathe picture is transmitted through a onedimensional channel. Pseudorandom scanning is one way of obtaining a onedimensional function from the twodimensional picture. Another way, which is often used in practice at the present, is sequential scanning, in which the picture is scanned along horizontal lines sequentially from top to bottom. We shall compare the effects of these two scanning methods on the received pictures for certain channels.