1. Field of the Invention
The present invention relates to an image signal compressing device adapted for use in a facsimile machine and an electronic filing machine.
2. Description of the Prior Art
Recently, a device has been developed which, when used in a facsimile machine or an electronic filing machine, operates to convert an image of intermediate gradation into a binary image signal according to a dither process.
It has, however, been found that, when the binary image signal, converted by the above described device, is compressed according to an MR code or a modified Hoffman (MH), which is a coding (compressing) system standardized in the facsimile machines, the compression ratio tends to be considerably lowered.