Image analysis – Image transformation or preprocessing – Changing the image coordinates
Patent
1994-09-02
1999-12-07
Johns, Andrew W.
Image analysis
Image transformation or preprocessing
Changing the image coordinates
G06K 936
Patent
active
059996633
ABSTRACT:
An arrangement for extracting and processing image data to form an array of re-scaled pixel data, this arrangement being part of a Normalizer/Scaler stage in an image lift/processing system, and including: a scaler for storing N different selectible scaling algorithms; a scaler-output; an input for receiving scanned lines of pixel data and feeding it sequentially line-by-line, pixel-by-pixel to the scaler, the input including "scale factors" for selecting an algorithm; while the scaler includes a mapping stage for executing a two-dimensional mapping of adjacent pixel values and adjacent scanline values; this arrangement also including a command store for storing scaling algorithms, with a command register input for the scale factors. Preferably the scaler also includes a First ROM for storing pixel values at prescribed addresses; a Second ROM for similarly storing previous pixel values, being input in parallel with the First ROM; a Latch to which the ROMs are output; and a pixel Counter reset with each new scan line; with a "current pixel" value input to a prescribed address in the First ROM, along with a "pixel count" number from the Counter, plus an associated scale factor; with an Adder interposed between the ROMs and the Latch to execute addition mapping.
REFERENCES:
patent: 4907284 (1990-03-01), Ohuchi
patent: 5001575 (1991-03-01), Nakahara
patent: 5008752 (1991-04-01), Van Nostrand
patent: 5020115 (1991-05-01), Black
patent: 5140648 (1992-08-01), Hackett et al.
patent: 5305398 (1994-04-01), Klein et al.
Edwards Daniel R.
Reasoner, Jr. George R.
Smith Gerald R.
Adornato Rocco L.
Johns Andrew W.
McCormack John J.
Starr Mark T.
Unisys Corporation
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