Location patterns and methods and apparatus for generating such patterns
First Claim
1. A printer system comprising a printer adapted to print a location pattern comprising a plurality of dots, each having a substantially predetermined size and nominal position in the pattern, the printer having a resolution constraining the position at which the dots may be printed, the system being adapted to modify at least some of the dots prior to printing such that the optical centre of gravity of the modified dots more closely coincides with their nominal positions.
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Accused Products
Abstract
A printer system comprising a printer adapted to print a location pattern comprising a plurality of dots, each having a substantially predetermined size and nominal position in the pattern, the printer having a resolution constraining the position at which the dots may be printed, the system being adapted to modify at least some of the dots prior to printing such that the modified dots have an optical centre of gravity that more closely coincides with their nominal positions.
68 Citations
32 Claims
- 1. A printer system comprising a printer adapted to print a location pattern comprising a plurality of dots, each having a substantially predetermined size and nominal position in the pattern, the printer having a resolution constraining the position at which the dots may be printed, the system being adapted to modify at least some of the dots prior to printing such that the optical centre of gravity of the modified dots more closely coincides with their nominal positions.
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21. A method of generating a location pattern comprising a plurality of dots, comprising the steps of:
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determining the nominal position of the dots in a pattern area; and
,assigning an asymmetrical shape to at least some of the dots in the pattern area, in dependence upon the characteristics of given printer, such that when printed, the optical centre of gravity of those dots substantially coincides with the corresponding nominal positions. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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29. A printer system comprising a printer and adapted to print a location pattern comprising a plurality of dots, the system being arranged to introduce an asymmetry into the shape of at least some of dots prior to printing the pattern.
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30. A printer system adapted to print a location pattern comprising a plurality of dots each offset from a nominal position in one of a plurality of directions, the system being arranged to modify the degree of offset of each dot from its nominal position by modifying the shape of each dot.
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31. A printer system adapted to print a location pattern comprising a plurality of dots, the dots having a first dimension lying between predetermined limits and each dot having an optical centre of gravity located at a predetermined nominal positions in the pattern, the system being adapted to modify the pattern prior to printing by introducing an asymmetry to the dot shape of selected dots, substantially without causing the first dimension to exceed its predetermined limits, such that when printed on a pre-selected printer the optical centre of gravity of the selected dots more closely coincides with their corresponding nominal positions.
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32. A location pattern arranged for use with a system comprising a pattern space having a plurality of dots each having a nominal position, the pattern having a plurality of dots, at least some of which having an asymmetric shape, having no more than one axis of symmetry, the asymmetric shape causing the optical centre of gravity of those dots to be located substantially at the corresponding predetermined nominal position.
Specification