PICTURE ELEMENT DENSITY CONVERSION SYSTEM

摘要

PURPOSE:To smooth a step difference of a slope of a character or a line drawing by obtaining a magnification picture with excellent density conservation from a picture in mixture of a character picture and a pseudo intermediate tone picture and implementing contour smoothing and magnification. CONSTITUTION:A contour smoothing magnification circuit 2 magnifies an inputted binary data into a multiple of (n) (n is an integer) in the main scanning direction and a multiple of (m) (m is an integer) in the subscanning direction respectively through contour smoothing magnification. A multi-value processing circuit 3 stores the data once into a memory, extracts a picture data of an optional area, refers an area comprising a noted picture element and its surrounding picture elements and calculates a picture data of a multi-value density based on a window outputted from a weight table. A magnification circuit 4 reduces/magnifies the picture data of multi-value density into an optional size by the interleave processing of a picture clock and a line synchronizing signal. A binarizing circuit 5 converts the picture data of the multi-value density into a binary data.