Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1997-07-17
2000-09-12
Rogers, Scott
Facsimile and static presentation processing
Static presentation processing
Attribute control
358456, H04N 1405
Patent
active
061185477
ABSTRACT:
Provided is an image processing apparatus in which high-quality image representation is possible at very low cost even if high image resolution is obtained. The apparatus includes a first halftone processor for pseudo-halftoning an 8-bit image signal to a 4-bit image signal, an image processor, which comprises a color correcting unit, a converter, a resolution converter, a spatial filter and a gamma corrector, for processing the 4-bit image signal, a second halftone processor for pseudo-halftoning the image-processed 4-bit image signal from the image processor to one bit, and a recorder for outputting an image based upon the 1-bit signal. In another aspect, the amount of calculation required for highly precise color correction processing inclusive of image-quality adjustment processing is large. This has made it necessary to rely upon hardware such as an ASIC, a consequence of which is higher cost. Accordingly, a first halftone processor converts input 8-bit data to 4-bit data and a color correcting unit performs color correction processing, using a LUT conversion, of the 4-bit data. Since the LUT is updated in dependence upon adjustment of image quality performed using a control panel, it is possible for the adjustment to be reflected in real time.
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patent: 5870503 (1999-02-01), Kumashiro
Canon Kabushiki Kaisha
Rogers Scott
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