Sequential image-modulated dot-area recording

Abstract From the Canadian patent

Continuous-tone original picture information such as a, photograph or original art work is put into a form suitable for half-, tone printing reproduction by raster-scan reading of the original to produce a varying video signal. The video signal is rendered suitable for writing in a high speed writer by continuously convolving (weighting, multiplying) said signal with stored halftone dot data (attenuation) signals obtained from a Read Only Memory and applying the resultant, treated signals through a quantizer, to control a beam of radiation to expose a sensitive printing or recording medium to a halftone image pattern in which each dot is configured to provide optimum image information …