Patent ID: 6785014
Filing Date: 2004-08-31
Classification: H04N

Abstract:
A facsimile apparatus, wherein the apparatus comprises a central processing unit for controlling the whole of the facsimile apparatus, an image reading unit which is capable of optically reading an image of an original document to be transmitted to output the read image as data representing halftone images, a halftone image binary processing unit for converting the image data representing halftone images, which is output from the image reading unit into binary image data, having two or more gradients, in which binary pixels are differently arranged depending upon a gradient, a modem for conducting modulation and demodulation between binary image data including the image data from the halftone image binary processing unit and a transmission signal which is transmitting over a communication line, and a line control unit for controlling the communication line on which transmitting facsimile apparatus communicates with receiving facsimile apparatus, wherein the gradient is selected depending upon data transmission rate which is determined by phase matching between the transmitting facsimile apparatus which transmits the binary image data and the receiving facsimile apparatus which receives the transmitted binary image data and the binary image data is generated by the halftone image binary processing unit based upon the selected gradient and wherein the obtained data is used as a transmission signal.