Method for detecting an optical structure
First Claim
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1. A method for detecting an optical structure from image sequences of an image recording system, comprising:
- deriving an optical flow field from the image sequences of the image recording system;
breaking down flow vectors of the optical flow field into axial components by projection onto axes of a coordinate system of an image recorded by the image recording system;
for each line of image extending parallel to a selected axis of the coordinate system, examining axial components of the flow vectors extending parallel to the selected axis of the coordinate system for a change of direction; and
connecting image elements containing the change of direction of the axial components of the flow vectors extending parallel to the selected axis of the coordinate system, to form a curve.
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Abstract
A method for detecting an optical structure from image sequences of an image recording system. An optical flow field is derived from the image sequences of the image recording system. The vectors of the optical flow field are broken down into components by projection onto a coordinate system of the image recorded by the image recording system. At least one component of the flow vectors is analyzed for a change of direction. The image elements containing a change of direction of a vector component are connected to form a curve.
14 Citations
12 Claims
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1. A method for detecting an optical structure from image sequences of an image recording system, comprising:
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deriving an optical flow field from the image sequences of the image recording system; breaking down flow vectors of the optical flow field into axial components by projection onto axes of a coordinate system of an image recorded by the image recording system; for each line of image extending parallel to a selected axis of the coordinate system, examining axial components of the flow vectors extending parallel to the selected axis of the coordinate system for a change of direction; and connecting image elements containing the change of direction of the axial components of the flow vectors extending parallel to the selected axis of the coordinate system, to form a curve. - View Dependent Claims (2, 3, 4, 5)
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6. A method for detecting an optical structure from image sequences of an image recording system, comprising:
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deriving a first flow field from the image sequences of the image recording system; deriving a second optical flow field from the image sequence reflected on a reflective surface and detected by the image recording system; breaking down flow vectors of the first and second optical flow fields into axial components by projection onto axes of a coordinate system of an image recorded by the image recording system; for each line of image extending parallel to a selected axis of the coordinate system, examining axial components of the flow vectors of the first and second optical flow fields extending parallel to the selected axis of the coordinate system for a change of direction; and connecting image elements containing the change of direction of the axial components of the flow vectors extending parallel to the selected axis of the coordinate system, to form a curve. - View Dependent Claims (7, 8, 9, 10)
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11. A method for calibrating an onboard image recording system, comprising:
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recording image sequences from a detection range of the image recording system via the onboard image recording system, the detection range of the image recording system including a part of a vehicle structure of the vehicle; deriving optical flow fields from the image sequences recorded by the image recording system; breaking down flow vectors of the optical flow field into axial components by projection onto axes of a coordinate system of an image recorded by the image recording system; for each line of image extending parallel to a selected axis of the coordinate system, examining axial components of the flow vectors of the optical flow fields extending parallel to the selected axis of the coordinate system for a change of direction; connecting image elements containing the change of direction of the axial components of the flow vectors extending parallel to the selected axis of the coordinate system, to form a curve; and comparing a position of the curve with a setpoint position. - View Dependent Claims (12)
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Specification