Rotation dependent halftone rendering in scanning

Details Rotation dependent halftone rendering in scanning Rotation dependent halftone rendering in scanning

2005-06-27

2008-09-30

Robinson, Mark A. (Department: 4163)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S001900, C358S003200, C382S245000, C382S252000

Reexamination Certificate

active

07430064

ABSTRACT:
A method and system for rotation-dependent halftone rendering. An image input is received from a scanning system or other source, the received image being either a contone image or an error-diffused mage. If a following right-angle image rotation is to be performed, the image is clustered by a clustering method which yields reduced file sizes with respect to the rotated orientation of the image. If no following right-angle image rotation will be performed, the binary image is clustered by an alternate clustering method which yields reduced file sizes with respect to the non-rotated image. The selective clustering includes dividing the image into a tessellation of cells and then concatenating like bits in each cell in a preferred direction for the rotated or non-rotated image. The clustered image is then rotated if necessary, and compressed.

REFERENCES:
patent: 4965677 (1990-10-01), Pennebaker et al.

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