Patent ID: 6067102
Filing Date: 2000-05-23
Classification: H04N

Abstract:
An electrophotographic printing apparatus, comprising:a charging unit for uniformly charging the surface of a photosensitive member;an exposure unit for forming an electrostatic latent image having at least three levels of electric potential on the photosensitive member surface by exposing said photosensitive member surface in accordance with input image information containing pixel data;a developing unit for developing said electrostatic latent image using two or more kinds of toners with mutually different charge polarities to form a toner image;a template determination unit for determining a recognition template on the basis of the pixel data of said image information;a recognizing unit for recognizing an image pattern from said pixel data by using the determined recognition template; anda unit for controlling said exposure unit to control the exposure of said photosensitive member surface by calculating the exposure quantity of each pixel of said input image information on the basis of the recognized image pattern.