Image transformation method and device

Details Image transformation method and device Image transformation method and device

1989-09-15

1990-12-04

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 42, G06K 900

Patent

active

049759760

ABSTRACT:
A rectangular source image formed by pixels in a two-axis coordinate system is transformed to a destination image by mapping vertices of the source image onto vertices of the destination image, then mapping edges of the destination image onto edges of the source image, mapping scan lines in the destination image onto the source image, and assigning to pixels on these scan lines the values of corresponding pixels in the source image. DDA algorithms are employed for the edge mapping and scan line mapping steps. This method enables arbitrary affine transformations, including combinations of a rotation with an enlargement or reduction, to be executed without introducing image defects.

REFERENCES:
patent: 4602285 (1986-07-01), Beaulier et al.
patent: 4672680 (1987-06-01), Middleton
patent: 4720871 (1988-01-01), Chambers
patent: 4774678 (1988-09-01), David et al.
patent: 4829446 (1989-05-01), Draney

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