System and method of additive interpolation for affine transform

Details System and method of additive interpolation for affine transform System and method of additive interpolation for affine transform

1997-10-28

2000-02-22

Boudreau, Leo H.

Image analysis

Image transformation or preprocessing

Changing the image coordinates

382293, 358428, 358525, G06K 932

Patent

active

060289694

ABSTRACT:
A summing interpolation method is provided for transferring images between coordinate systems in an affine transformation, using a simplified series of interpolation formulas. The small number of interpolation formulas required by the present invention permits the calculation of an interpolated pixel value through the addition of pixels with discrete locations bordering a calculated, non-discrete, pixel location. The data of discrete pixel locations closer to the calculated location are added more often in the interpolation than those further away. Specifically, the non-integer remainder of the calculated location is rounded off to one-quarter increments in the X and Y axis, and an interpolation formula is chosen in response to the rounded increment location values. In this manner, all possible calculated locations are interpolated with a small number of fixed interpolation formulas. A interpolation summing system, for use in an affine transformation, is also provided.

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patent: 5396592 (1995-03-01), Fujimoto
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patent: 5796426 (1998-08-01), Gullichsen et al.
patent: 5799113 (1998-08-01), Lee
Technical Manual Ver. E1.2, Sumitomo Metal Industries, Ltd, entitled, SMI ASSP Image-Processing LSI Series, IP90C16, Affine Transformation Accelerator (Affine).

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