Method and apparatus for uniformly scaling a digital image

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395133, 395501, G06T 340

Patent

active

056218702

ABSTRACT:
An apparatus is used to process an original digital image to obtain a uniformly scaled desired digital image, the original digital image having a number (N) of successive original image data while the desired digital image has a number (M) of successive desired image data. When (M) is greater than (N), linear interpolation of (n)th and (n+1)th ones of the original image data is performed to produce a residual interpolated image data inserted therebetween when division of (M-N) by (N-1) results in a remainder (S) and when (n) is a minimum number which meets a condition (n+1)*(S).gtoreq.(s)*(N), wherein (s) ranges from 1 to (S). When (M) is less than (N), an address generator controls a memory unit to output selected ones of the original image data. A succeeding original image data outputted by the memory unit is offset from an immediately preceding original image data outputted thereby by a number (V) or by a number (V+1), the number (V) being equal to a quotient that results from division of (N) by (M).

REFERENCES:
patent: 4558347 (1985-12-01), Pritchard et al.
patent: 5089893 (1992-02-01), Iwase
patent: 5283651 (1994-02-01), Ishizuka
patent: 5384904 (1995-01-01), Sprague et al.

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