Apparatus and method for performing fast and precise spatial tra

Details Apparatus and method for performing fast and precise spatial tra Apparatus and method for performing fast and precise spatial tra

1996-05-31

1998-12-08

Boudreau, Leo H.

Image analysis

Image transformation or preprocessing

382277, 382285, 382293, 358448, G06K 932, G06K 936

Patent

active

058481990

ABSTRACT:
An apparatus and a method for performing spatial transformations of digital images with reduced computation time are provided. In one embodiment of the present invention, an image processing apparatus for transforming a source image into a destination image generates a transformation matrix having transformation variables represented in fixed point format, maps a first pixel of a destination pixel array onto a source pixel array by multiplying the row value and the column value of the first pixel by the transformation matrix to obtain a first mapped position on the source pixel matrix, maps a second pixel of the destination array onto the source array by adding a first variable of the transformation to an x value of the first mapped position and by adding a second variable of the transformation matrix to the y value of the first mapped position to obtain a second mapped position. Embodiments of the present invention determine a value of each one of the pixels of the destination pixel array based on a value of at least one of the pixels of the source pixel array and based on a mapped position of the one of the pixels of the destination array.

REFERENCES:
patent: 4775973 (1988-10-01), Tomberlin et al.
patent: 4975976 (1990-12-01), Kimata et al.
patent: 5204944 (1993-04-01), Wolberg et al.
patent: 5644758 (1997-07-01), Patrick et al.
patent: 5664082 (1997-09-01), Chen et al.

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