Issue No.02 - February (1970 vol.19)
An improved method for the production of pictorial output on a line printer is described. A reasonable black-white contrast ratio is obtained by overprinting up to eight characters, and pseudorandom noise is used to smooth out discontinuities in the range of print densities.
Linear interpolation, line printers, overprinting, pictorial output, picture coding, picture output.
I.D.G. Macleod, "Pictorial Output with a Line Printer", IEEE Transactions on Computers, vol.19, no. 2, pp. 160-162, February 1970, doi:10.1109/T-C.1970.222883