Pseudo halftone print generator and method

Details Pseudo halftone print generator and method Pseudo halftone print generator and method

H - Electricity

04

N

178/3.1

H04N 1/40 (2006.01) H04N 1/405 (2006.01)

Patent

CA 1047935

PSEUDO HALFTONE PRINT GENERATOR AND METHOD 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 count- ing 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 (N2). 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 (NxN) matrices. The refer- ence 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 be- tween 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.

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