Method and device for decoding a position-coding pattern
First Claim
1. A method for position decoding, comprisingcalculating a multi-bit position on the basis of information determined from a single partial area, imaged by a sensor, of a position-coding pattern, said partial area imaged by the sensor ideally defining a position in the position-coding pattern;
- matching, if the calculation of the position fails, information from the image of the partial area imaged by the sensor with information about how the position-coding pattern is designed in a plurality of other partial areas, which each define a position in the position-coding pattern; and
accepting the position of the positions defined by the other partial areas which according to the matching is the most probable position in the position-coding pattern for the imaged partial area imaged by the sensor.
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Abstract
In a method for position decoding, a position is calculated on the basis of information determined from a partial area, imaged by a sensor, of a position-coding pattern. If the position calculation fails, the information from the partial area recorded by the sensor is matched with information about how the position-coding pattern is designed in a plurality of matching partial areas, which each define a position in the position-coding pattern. The position of the positions defined by the matching partial areas, which according to the matching step is the most probable position in the position-coding pattern for the imaged partial area is accepted as the decoded position.
A device and a computer program for carrying out the method are also described.
49 Citations
21 Claims
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1. A method for position decoding, comprising
calculating a multi-bit position on the basis of information determined from a single partial area, imaged by a sensor, of a position-coding pattern, said partial area imaged by the sensor ideally defining a position in the position-coding pattern; -
matching, if the calculation of the position fails, information from the image of the partial area imaged by the sensor with information about how the position-coding pattern is designed in a plurality of other partial areas, which each define a position in the position-coding pattern; and accepting the position of the positions defined by the other partial areas which according to the matching is the most probable position in the position-coding pattern for the imaged partial area imaged by the sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A device for position decoding, said device comprising a signal-processing unit, which is adapted to calculate a multi-bit position on the basis of information determined from a single partial area, imaged by a sensor, of a position-coding pattern, said partial area imaged by the sensor ideally defining a position the position-coding pattern;
- said signal-processing unit being further adapted to match, if the calculation of the position fails, information from the image of the partial area imaged by the sensor with information about how the position-coding pattern is designed in a plurality of other partial areas, which each define a position in the position-coding pattern, and to accept the position of the positions defined by the other partial areas, which according to the matching is the most probable position in the position-coding pattern for the imaged partial area.
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21. A device for position decoding, comprising:
a processor having logic configured to calculate a multi-bit position on the basis of information determined from a single imaged partial area of a position-coding pattern, said partial area imaged by the sensor ideally defining a position in the position-coding pattern, wherein the positions are encoded in the position-coding pattern by the displacement of the center of gravity of marks in relation to raster points, match, if the calculation of the position fails, information from the image of the partial area imaged with information derived from the properties of the position-coding pattern in a plurality of other partial areas, and accept the position of the positions defined by the other partial areas, which is the most probable position in the position-coding pattern for the imaged partial area.
Specification