Localisation and mapping
First Claim
1. A method of generating a three-dimensional map of a region from successive images of the region captured from different camera poses, the map comprising a set of landmark points each defined by a three dimensional spatial position and image information associated with that three dimensional position, the method comprising:
- capturing successive images of the region using a camera;
designating, by one or more processors, a subset of the captured images as a set of keyframes each having respective sets of image position data representing image positions of landmark points detected as feature points in that image;
in respect of a newly captured image, detecting, by the one or more processors, a position of the camera by detecting the position of landmark points in the newly captured image, the detecting step comprising;
generating, by the one or more processors, a prediction of the camera pose;
dividing the newly captured image into a plurality of image regions;
selecting, by the one or more processors, an ordering of the landmark points separately in respect of each of the image regions so as to select a second ordering of landmark points for each image region; and
detecting, by the one or more processors, whether an image region of the newly captured image approximately matches an expected image position of a landmark point based on the predicted camera pose by detecting, for successive landmark points in the ordering, whether the image region is substantially identical to the image information associated with that landmark point; and
refining, by the one or more processors, the prediction of the camera pose based on the detecting step;
in which the selecting step comprises;
performing, by the one or more processors, a statistical test on the set of landmark points; and
selecting, by the one or more processors, the ordering according to the results of the statistical test.
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Accused Products
Abstract
A method generates a three-dimensional map of a region from successive images captured from different camera poses. The method includes a camera capturing images of the region; designating a subset of captured images as a set of keyframes each having respective sets of image position data representing image positions of landmark points detected as feature points in that image; for a newly captured image, generating a camera pose prediction; selecting an ordering of the landmark points; detecting whether an image region of the new image approximately matches an expected image position of a landmark point based on the predicted camera pose by detecting whether the image region is substantially identical to the image information associated with that landmark point; and refining the pose prediction from the detecting step. The selecting includes performing a statistical test on the landmark points and selecting the ordering according to the statistical test results.
16 Citations
11 Claims
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1. A method of generating a three-dimensional map of a region from successive images of the region captured from different camera poses, the map comprising a set of landmark points each defined by a three dimensional spatial position and image information associated with that three dimensional position, the method comprising:
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capturing successive images of the region using a camera; designating, by one or more processors, a subset of the captured images as a set of keyframes each having respective sets of image position data representing image positions of landmark points detected as feature points in that image; in respect of a newly captured image, detecting, by the one or more processors, a position of the camera by detecting the position of landmark points in the newly captured image, the detecting step comprising; generating, by the one or more processors, a prediction of the camera pose; dividing the newly captured image into a plurality of image regions; selecting, by the one or more processors, an ordering of the landmark points separately in respect of each of the image regions so as to select a second ordering of landmark points for each image region; and detecting, by the one or more processors, whether an image region of the newly captured image approximately matches an expected image position of a landmark point based on the predicted camera pose by detecting, for successive landmark points in the ordering, whether the image region is substantially identical to the image information associated with that landmark point; and refining, by the one or more processors, the prediction of the camera pose based on the detecting step; in which the selecting step comprises; performing, by the one or more processors, a statistical test on the set of landmark points; and selecting, by the one or more processors, the ordering according to the results of the statistical test. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A non-transitory computer readable medium storing computer instructions thereon, the instructions, when executed by a processor, cause the processor to carry out a method of generating a three-dimensional map of a region from successive images of the region captured from different camera poses, the map comprising a set of landmark points each defined by a three dimensional spatial position and image information associated with that three dimensional position, the method comprising:
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capturing successive images of the region using a camera; designating a subset of the captured images as a set of keyframes each having respective sets of image position data representing image positions of landmark points detected as feature points in that image; in respect of a newly captured image, detecting a position of the camera by detecting the position of landmark points in the newly captured image, the detecting step comprising; generating a prediction of the camera pose; dividing the newly captured image into a plurality of image regions; selecting an ordering of the landmark points separately in respect of each of the image regions so as to select a second ordering of landmark points for each image region; and detecting whether an image region of the newly captured image approximately matches an expected image position of a landmark point based on the predicted camera pose by detecting, for successive landmark points in the ordering, whether the image region is substantially identical to the image information associated with that landmark point; and refining the prediction of the camera pose based on the detecting step; in which the selecting step comprises; performing a statistical test on the set of landmark points; and selecting the ordering according to the results of the statistical test.
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9. Image processing apparatus configured to generate a three-dimensional map of a region from successive images of the region captured from different camera poses, the map comprising a set of landmark points each defined by a three dimensional spatial position and image information associated with that three dimensional position, a subset of the captured images being designated as a set of keyframes each having respective sets of image position data representing image positions of landmark points detected as feature points in that image, the apparatus comprising:
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a predicted position detector configured in respect of a newly captured image to detect a prediction of the camera pose for the newly captured image; a divider configured to divide the newly captured image into a plurality of image regions; a selector configured to select an ordering of the landmark points separately in respect of each of the image regions so as to select a second ordering of landmark points for each image region; a detector configured to detect whether an image region of the newly captured image approximately matches an expected image position of a landmark point based on the predicted camera pose by detecting, for successive landmark points in the ordering, whether the image region is substantially identical to the image information associated with that landmark point; and a prediction processor configured to refine the prediction of the camera pose based on the detection; in which the selector comprises; processing means for performing a statistical test on the set of landmark points; and processing means for selecting the ordering according to the results of the statistical test.
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10. Computer games apparatus comprising:
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an image processing apparatus configured to generate a three-dimensional map of a region from successive images of the region captured from different camera poses, the map comprising a set of landmark points each defined by a three dimensional spatial position and image information associated with that three dimensional position, a subset of the captured images being designated as a set of keyframes each having respective sets of image position data representing image positions of landmark points detected as feature points in that image, the apparatus comprising; a predicted position detector configured in respect of a newly captured image to detect a prediction of the camera pose for the newly captured image; a divider configured to divide the newly captured image into a plurality of image regions; a selector configured to select an ordering of the landmark points separately in respect of each of the image regions so as to select a second ordering of landmark points for each image region; a detector configured to detect whether an image region of the newly captured image approximately matches an expected image position of a landmark point based on the predicted camera pose by detecting, for successive landmark points in the ordering, whether the image region is substantially identical to the image information associated with that landmark point; and a prediction processor configured to refine the prediction of the camera pose based on the detection; in which the selector comprises; processing means for performing a statistical test on the set of landmark points; and processing means for selecting the ordering according to the results of the statistical test; and an image renderer configured to render an image for display by combining a captured image with one or more computer-generated image portions generated with respect to map positions associated with feature points of the captured image. - View Dependent Claims (11)
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Specification