Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-02-01
1993-03-23
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 22, H04N 5262
Patent
active
051969343
ABSTRACT:
An apparatus for scaling an image as represented by an arrangement of picture elements. The apparatus scales the image from a first size to a second size based upon plurality of scaling parameters which represent a desired scaling factor. The apparatus includes a scaler circuit which receives the plurality of scaling parameters and an image signal representing the arrangement of picture elements. The scaler circuit manipulates the arrangement of picture elements based upon the plurality of scaling parameters to provide a manipulated arrangement of picture elements. The manipulation includes performing different operations on subsets of the picture elements based upon the plurality of scaling parameters. The operations include a drop operation, which omits a pixel which is received by the scaler circuit, a keep operation, which keeps a pixel which is received by the scaler circuit, a dual operation, which averages two pixels which are received by the scaler circuit, and a quad operation, which averages four pixels which are received by the scaler circuit. The scaler circuit provides the manipulated arrangement of picture elements as a scaled image.
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Baxes, Gregory A. "Digital Image Processing", Prentice-Hall Inc. 1984, pp. 160-161.
Fant, "A Nonaliasing, Real-Time Spatial Transform Technique", IEEE Computer Graphics & Applications, vol. 6, No. 1, Jan. 1986.
Burkert et al., "IC Set For a Picture-In-Picture System With On-Chip Memory", IEEE Transactions of Consumer Electronics, vol. 36, No. 1, Feb. 1990.
Fleischman, "Design of a Dual-Video Display Device", Univ. of Florida 1986.
Fleischman Ross M.
Wilkie Bruce J.
Groody James J.
Harvey David E.
International Business Machines - Corporation
Terrile Stephen A.
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