G - Physics – 09 – G
Patent
G - Physics
09
G
354/236, 375/4
G09G 5/00 (2006.01) G06T 3/40 (2006.01) G06T 5/40 (2006.01)
Patent
CA 2012404
ABSTRACT OF THE DISCLOSURE A method and apparatus are disclosed in a data processing system for rapidly and efficiently converting a black and white image comprised of rows and columns of picture elements to a reduced size grayscale image. Each picture element within the black and white image is either black or white. A dynamic determination is made of a specified number of picture elements from the black and white image which correspond to each new picture element within the reduced size grayscale image. Next, a bit counting algorithm is utilized to determine the number of black and white picture elements within each specified number of picture elements of the black and white image. The resultant tally is then utilized to access a table containing various grayscale values and the accessed grayscale value is assigned to an associated new picture element of the reduced size grayscale image. In a preferred embodiment of the present invention, the determination of the specified number of picture elements from the black and white image which correspond to each new picture element within the reduced size grayscale image is rounded off to the nearest whole number of picture elements.
Deacon John J.
International Business Machines Corporation
Kerr Alexander
LandOfFree
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