A Study for Printing of Half-Tone Images by Laser Nonimpact-Printer

Printing of images is very important for image processing, since the results of image processing are necessary to be given as visual images. This paper considers for printing of half-tone images by the NEC N7384-21 laser nonimpact-printer of ACOS computer system. The fixed-pattern methods, the dither methods and the extended dither methods are tested using GIRL and MOON SURFACE images in SIDBA. As results of evaluation, the fixed-pattern methods with dot-concentrated type are efficient for printing images of large size, and the dither and the extended dither methods with dot-concentrated threshold matrix are very convenient for printing images of small size, 27×27((mm)^2) or 54×54((mm)^2). It has been shown to be necessary to take the exponential (absorption) scale translation to get easy image output to see.