Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1975-01-20
1977-06-28
Cardillo, Jr., Raymond F.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358298, H04N 140, H04N 122
Patent
active
040329780
ABSTRACT:
Gray scale levels are converted to pseudo halftone print by a pseudo halftone generator which reduces Moire effects. The generator includes a comparator and an incrementing cyclic counting mechanism to compare the gray scale level to the cyclicly generated reference count for each print position in a print line to generate a print signal upon the level being greater than the count. The cyclicly generated count is incremented by a preselected number N for each print position and recycles at the square of that number (N.sup.2). The square value may also be selected as the maximum level of the gray scale range. N adjacent print lines may be grouped together to form a series of (N.times.N) matrices. The reference or lowest count value for each of the lines in a matrix is different and they range from zero to N-1. The arrangement of the lines in the matrix is such as to minimize the difference between the sums of the count element values for any two adjacent print lines. The count for each generator is initialized at the beginning of the print line and may be established randomly for each print line or, alternatively, for each matrix of print lines, the matrix being arranged in a predetermined manner.
REFERENCES:
patent: 3294896 (1966-12-01), Young
patent: 3916096 (1975-10-01), Everett
Smith, Halftone Image Produced by Pseudo-Random Bit Generator, IBM Tech. Disclosure Bulletin, vol. 17, No. 7, 12/74.
Cardillo, Jr. Raymond F.
Holcombe J. H.
International Business Machines - Corporation
Schmid, Jr. O.
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