Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1986-04-25
1988-02-16
Groody, James J.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358280, 340728, 340731, 364577, 382 47, H04N 1393, H04N 1387, G06G 730, G06K 942
Patent
active
047258926
ABSTRACT:
A method and apparatus for reducing or enlarging an image. More specifically, this invention can increase or decrease the magnification ratio of an image even while scanning each line. This invention involves converting a first image with a first pel density to a second image with a second pel density. The intensity P of a new pel at a point p of the second image is represented by ##EQU1## where m is the number of reference pels of the first image that are sampled and that are within a given two-dimensional reference window when it is in a predetermined position corresponding to the point p, where Ii is the intensity of the i-th pel of the m sampled reference pels, and where .alpha.i is a contribution rate indicating how much the i-th pel contributes to the intensity P. Pre-calculated contribution rate data (.alpha.i) and pre-calculated shifting amount data indicating the relative amount the reference window is to be shifted are stored in a memory. The shifting amount data is used to position the reference window to a predetermined position where the m reference pels are sampled, and the contribution rate data and the values of the m sampled pels are used to determine the intensity P.
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Suzuki Naoshi
Yanagisawa Hiroshi
Yokemura Taketoshi
Cameron Douglas W.
Groody James J.
International Business Machines - Corporation
Svihla Randall S.
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