Patent ID: 6088513
Filing Date: 2000-07-11
Classification: G06F,G06K,H04N

Abstract:
A method of comprising image data comprising a plurality of n raster line to provide compressed data and outputting the compressed data to a data processing apparatus via a predetermined interface, comprising:a first step of compressing a first raster line of image data in a horizontal direction without any exclusive OR operation processing and of outputting the corresponding compressed data, as data on the first raster line, to the data processing apparatus via the predetermined interface;a second step of performing an exclusive OR operation processing between image data on a raster line i and image data on a raster line i-1;a third step of compressing in a horizontal direction the information obtained by the exclusive OR operation processing in said second step;a fourth step of outputting the compression information obtained in said third step, as data on the raster line i, to the data processing apparatus via the predetermined interface; andperforming and second to fourth step for raster lines i=2 to n, irrespective of the contents of the image data on the raster line i,wherein when said exclusive OR operation processing produces a succession of plural lines of blanks, a predetermined command is outputted to the data processing apparatus via the predetermined interface.