SYSTEM FOR CONVERTING GRAY LEVEL VALUE OF PICTURE INTO BINARY LEVEL VALUE

摘要

PURPOSE: A system for converting gray level value of picture into binary level value CONSTITUTION: A system for converting gray level value of picture into binary level value includes a memory (10) storing binary converted error values as to each pixel of previous plural lines from a line having a target pixel; a shift register (12) performing shifting of binary converted error values in a given sized window of the memory (10); a gray level correction part (14) adding an average obtained by multiplying the binary converted error values in the window by a weight and a gray level value of the currently input target pixel to produce a corrected gray level value; and a binary conversion and error computing part (16) storing a binary converted error value of the target pixel in the memory (10) and the current target pixel's position of the shift register (12). The inventive system computes the binary level value of the target pixel before application of the next pixel after inputting the target pixel, and consecutively produces the binary level value by system clock periods so that the gray level value of the picture can be rapidly converted.