Optically Readable Markers
AssigneeZappar Limited
InventorsSimon John Taylor, Jordan Evan Campbell
Life of this patent
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Abstract
An optically readable marker comprises a dash and two dots arranged in a pattern to allow detection of the marker, wherein the dash and dots are collinear, and wherein the dots are of the same size and shape and adjacent to each other. Multiple such optically readable markers may be combined into a composite marker, optionally with one element (i.e. a dash or a dot of the marker) being at least partially shared between two or more markers.
Claims29
A marker detection and position-determination system comprising:
- an optically readable marker comprising a dash and two dots arranged in a pattern to allow detection of the marker, wherein the dash and dots are collinear, and wherein the dots are of the same size and shape and adjacent to each other;
- and
- a processing unit arranged to:
- obtain marker reference data for the marker, the marker reference data providing data relating to a template of the marker;
- obtain a two-dimensional image showing the marker;
- identify the marker in the two-dimensional image from the relative sizes and spacings of detected elements of the marker, the elements of the marker being the dash and the dots;
- and
- determine the position of the marker by determining correspondences between the detected elements and the template and computing an image transformation to align the detected elements with the template.
An optically readable marker comprising:
- a dash and two dots arranged in a pattern to allow detection of the marker, wherein the dash and dots are collinear, and wherein the dots are of the same size and shape and adjacent to each other,
- and wherein the dash and two dots of the optically readable marker are arranged to allow the marker to be identified, and a position of the marker to be determined, by a processing unit using marker reference data.
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A computer-implemented method for identifying the presence of an optically-readable marker, the method comprising:
- obtaining marker reference data, the marker reference data providing data relating to a template for an optically readable marker comprising a dash and two dots, wherein the dash and dots are collinear, and wherein the dots are of the same size and shape and adjacent to each other;
- in an image, identifying a pattern, the pattern comprising at least three elements;
- verifying that the relative sizes and spacings of the elements of the pattern correspond to an optically readable marker defined in the marker reference data so as to identify the pattern as forming an optically readable marker.
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Dependencies are inferred from the claim text.