Image processing

Details Image processing Image processing

1987-09-10

1990-05-01

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

364522, 364726, 382 43, G06K 936

Patent

active

049225448

ABSTRACT:
A method and apparatus for processing original data defining the values of pixels of an original colored image represented in a spatial domain by two or more color separations each color separation defining the respective color component content of pixels arranged in a two dimensional array extending in X and Y directions. The apparatus comprises a store 6 for storing the original data; and a frequency transform circuit 8 for performing a three dimensional transformation on the store representation to generate transformed data representing the original image in three dimensional frequency space. Two of the three dimensions represent the variation in pixel value in the X direction and the Y direction respectively and the transformed data has a single zero order frequency term.

REFERENCES:
patent: 4698689 (1987-10-01), Tzou
patent: 4707738 (1987-11-01), Ferre et al.
patent: 4751742 (1988-06-01), Meeker
patent: 4754492 (1988-06-01), Malvar
Bracewel, "The Fourier Transform and its Applications", second edition, McGraw-Hill Int. Book Co., pp. 250-253.
"Spatial Transform Coding of Color Images", William K. Pratt, IEEE Transactions on Communication Technology, vol. COM-19, No. 6, Dec. 1971.
"A Color Facsimile System which can be Economically Implemented with a Microprocesssor", Dr. Robert D. Solomon, Technologie de Pointe Pour le Traitement des Signaux, Oct. 1975.

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