Patent ID: 6111665
Filing Date: 2000-08-29
Classification: H04N

Abstract:
An image forming apparatus comprising:an image memory for storing image data;means for writing the image data into the image memory;means for reading out the image data stored in the image memory; andcontrol means for enabling a writing operation of the writing means and a reading operation of the reading means to progress simultaneously during controlling so that the reading operation may not pass the writing operation, wherein said control means includes;means for computing a minimum reading time required to read out the image data from the memory;means for previously computing a number of words of the image data transferred from said writing means between a writing operation start time and a writing operation end time of said writing means minus the minimum reading time;means for counting the number of words of the image data transferred from said writing means between the writing operation start time and a present time;means for checking the number of words counted by said counting means at regular intervals; andmeans for causing said reading means to start reading when the number of words checked by said checking means has exceeded the number of words previously computed by said computing means.