Dehalftoning of digital images

Details Dehalftoning of digital images Dehalftoning of digital images

1997-12-22

2000-02-01

Nguyen, Phu K.

Computer graphics processing and selective visual display system

Computer graphics processing

Graph generating

G06F 1500

Patent

active

06020897&

ABSTRACT:
Methods and apparatus for blending graphics objects. In one aspect, a method includes receiving a first graphics object; rendering the first graphics object to produce a first pixel map having a first bit depth; increasing a bit depth of a second pixel map associated with a second graphics object that is to be blended with the first graphics object, where the second bit depth is less than the first bit depth; and blending the first and second pixel maps. The method may be implemented to blend graphics objects received by a printing device. In one embodiment, the invention features blending deep pixel data received by a printing device with corresponding shallow halftoned data stored in a shallow frame buffer. The invention may be implemented as a printer configured to receive a page description language description of a page to be printed, the printer including a dehalftone engine for deriving deep pixel data values for objects stored in a shallow frame buffer. In another aspect, the invention features using a pixelmap representative of underlying graphics data for transfer between a host and a remote device by transmitting a halftone representation of the pixelmap from the host to the remote device and reconstructing the pixelmap at the remote device from the halftone representation and a threshold matrix.

REFERENCES:
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Barsky et al., "An Adaptive Subdivision Method with Crack Prevention for Rendering Beta-spline Objects," Berkeley Computer Graphics Laboratory, Comp. Science Div., Berkeley, CA, pp. 1-44.
Adobe PostScript Language Reference Manual, Addison-Wesley 2nd ed. 1990, pp. 309-319.

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