Bob Chihming Lin

US Patent:

63319020, Dec 18, 2001

Filed:

Oct 14, 1999

Appl. No.:

9/418956

Inventors:

Bob Chih-Ming Lin - Newport Beach CA

Assignee:

Match Lab, Inc. - Irvine CA

International Classification:

B41B 100

US Classification:

358 19

Abstract:

A pipeline processor for scaling and converting RGB color input images to CMYK at a magnification specifiable in 1 percent increments up to 400% includes a scaler having predefined main scale factors including one at maximum scale. An interim scale factor is selected from the main scale factors as one nearest the specified magnification toward the high end of the range. A pixel transformation is made at the interim scale factor between a subset of the source pixels and a corresponding subset of intermediate pixels using hardware circuits. The intermediate pixels are then interpolated to produce a scaled image by dropping an evenly spaced subset of the intermediate pixels when the magnification is less than the interim scale factor. A set of enhanced pixels is derived from the scaled image by proportionally weighting center pixels against average values of diagonally neighboring pixels. Color conversion is done by multiplex addressing of a lookup table using high-order portions of RGB values and incremented values to obtain sets of neighboring CMYK values.