Image convolution using pre-calculated lookup tables

Details Image convolution using pre-calculated lookup tables Image convolution using pre-calculated lookup tables

1996-10-30

1999-06-29

Boudreau, Leo H.

Image analysis

Image transformation or preprocessing

Convolution

382276, 382277, 382280, 345137, 36472801, 36472802, G06K 15316, G06K 964

Patent

active

059179619

ABSTRACT:
Methods and apparatus are provided for processing a source image in an image processing system including an electronic digital computer and image processing software for operating the computer. The source image is processed by convolution of pixels of the source image with coefficients of a convolution kernel to provide an output image. A lookup table is generated before new pixel values are determined. The table includes products of each coefficient and each possible value of the pixel in the source image. For each of the coefficients, the product that corresponds to the pixel value in a convolution window is accessed in the table. The accessed products are summed to provide a new pixel value in the output image. The steps of accessing the products in the table and summing the accessed products are repeated for each of the source pixels being convolved.

REFERENCES:
patent: 4720871 (1988-01-01), Chambers
patent: 4725892 (1988-02-01), Suzuki et al.
patent: 5054097 (1991-10-01), Flinois et al.
patent: 5151953 (1992-09-01), Landeta
patent: 5488674 (1996-01-01), Burt et al.

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