Facsimile and static presentation processing – Static presentation processing – Size – resolution – or scale control
Reexamination Certificate
1998-02-17
2001-04-03
Rogers, Scott (Department: 2724)
Facsimile and static presentation processing
Static presentation processing
Size, resolution, or scale control
C358S001400, C358S001700, C358S001900, C358S001160, C358S447000, C358S462000, C358S463000, C358S451000, C382S218000, C382S264000, C382S269000, C382S275000, C347S240000
Reexamination Certificate
active
06211967
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an image processing device capable of writing two lines at a time which is advantageously applicable to a copier, facsimile apparatus, printer or similar apparatus using digital image data.
Technologies relating to density conversion in the subscanning direction for single beam writing applications are disclosed in, e.g., Japanese Patent Laid-Open Publication No. 7-87321. This document pertains to an image data processing device of the type recognizing the shape of a line at a boundary between a black dot area and white dots which are arranged in a bit map, transforming the characteristic of the line recognized on a dot basis to bit code information, using a part of the code information to determine whether or not data needs correction, and executing correction with dots needing correction in accordance with the code information. The technology taught in the above document is characterized by image data generating means capable of repeatedly generating identical image data arranged in a bit map at the same timing for any desired signal waveform. For example, the image data generating means reads bit map data out of a memory twice in order to double the density of the data in the subscanning direction.
However, the above conventional technology does not effect density conversion in the main scanning direction and is limited to double density control in the subscanning direction.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide an image processing device capable of implementing high speed, high definition writing by converting the density of data to be written in the main scanning direction and subscanning direction independently and executing the separation of the data into two lines and the conversion of an image transfer rate for two beam writing.
In accordance with the present invention, an image processing device capable of writing two lines at the same time includes a data bus with a control section for controlling the bus width of input data. A temporary storage temporarily stores data input thereto. A data control section controls the reading and writing of data out of the temporary storage. A two line section produces two lines for writing two lines of input data at the same time. A data converting section converts parallel data to serial data. A multilevel section transforms an input bilevel image to a multilevel image. A rate varying section varies the rate of multilevel data input thereto. A data selecting section selects processed multilevel image data. A register control section executes register control with at least data stored in a storage included in the multilevel section. Data conversion and transformation to the multilevel image data are effected before the data output from the temporary storage are output from the data selecting section.
REFERENCES:
patent: 5036545 (1991-07-01), Iida
patent: 5045869 (1991-09-01), Isaka
patent: 5050221 (1991-09-01), Ohta
patent: 5410337 (1995-04-01), Saito
patent: 5805304 (1998-09-01), Sekine
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Ricoh & Company, Ltd.
Rogers Scott
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