Image processing

Details Image processing Image processing

1988-10-06

1990-07-10

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

3647241, 36472412, G06K 936

Patent

active

049411853

ABSTRACT:
A method and apparatus for processing a first (e.g. half-tone) image constituted by a second (e.g. continuous tone) image convolved with a periodic (screen) function, to produce the second image is described. The invention is particularly suited to handling digitally represented half-tone images. The apparatus comprises a microcomputer (17) for determining digital data defining a frequency filter characteristic adapted to suppress the frequency or frequencies of the periodic function. A fast Fourier transform circuit (11) transforms the image data into the frequency domain and a multiplier (12) multiplies the transformed data by the frequency characteristic stored in a store (13). The resultant multiplied data is inversely transformed back into the image of spatial domain by a fast Fourier transform circuit (14) to generate the second image.

REFERENCES:
patent: 4060850 (1977-11-01), Speiser
patent: 4194221 (1980-03-01), Stoffel
patent: 4282511 (1981-08-01), Southgate et al.
patent: 4293912 (1981-10-01), Walters
patent: 4435751 (1984-03-01), Hori et al.
patent: 4558462 (1985-12-01), Horiba et al.
patent: 4651293 (1987-03-01), Kato
Stoffel et al., "A Survey of Electronic Techniques for Pictoral Image Reproduction", IEEE Transactions on Communications, vol. Com-29, No. 12, Dec. 1981, pp. 1898-1924.
Hayt, Jr., et al., Engineering Circuit Analysis, third edition, 1978, pp. 664-673.

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