Fitzpatrick, Cella, Harper & Scinto
Color image processing apparatus with memory interface synchronization between image scanner and printer operations
 A color image processing apparatus comprises a printer for printing an image corresponding to an original image scanned by an scanner. An image memory is provided into which signals from the color scanner respectively corresponding to plural colors are written and from which signals to be transmitted to the printer are read. The image memory is arranged such that a signal for a writing operation and a signal for a reading operation are substantially simultaneously input. A memory control unit addresses the image memory in either the writing operation or the reading operation. The memory control unit comprises a writing address counter, a reading address counter and a control means. The control means controls the writing address counter and the reading address counter such that image data is read from the image memory before the writing of the image data into the memory is completed. 
Canon Kabushiki Kaisha
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Yasumichi Yoshinori Toshio
Suzuki Ikeda Honma