METHOD AND CIRCUIT ARRANGEMENT FOR CONVERSION OF RESOLUTMETHOD AND CIRCUIT ARRANGEMENT FOR CONVERSION OF RESOLUTION OF BINARY PSEUDO-HALFTONE IMAGES ION OF BINARY PSEUDO-HALFTONE IMAGES

摘要

A first pseudo-halftone picture is converted to a second pseudo-halftone picture of reduced resolution in the ration m:n by dividing the first picture into contiguous picture fields each having ixn lines and jxn columns of picture elements in contiguous square subfields each having n2 picture elements. m2 elements are selected from each subfield in accordance with a selection sequence which depends on the position of the subfield in the picture field, the elements being selected from all ixn lines and all jxn columns of each picture field, the selection sequence being the same for each picture field.