Method and apparatus for detecting objects from terrestrial based mobile mapping data
First Claim
1. Method of detecting objects from terrestrial based mobile mapping data, wherein the terrestrial based mobile mapping data has been captured by way of a terrestrial based mobile mapping vehicle driving on a road having a driving direction, the mobile mapping data including laser scanner data, source images obtained by at least one camera and position and orientation data of the terrestrial based mobile mapping vehicle, wherein the laser scanner data includes laser points, each laser point having associated position and orientation data, and each source image comprises associated position and orientation data, the method comprising:
- retrieving a position and orientation of the terrestrial based mobile mapping vehicle;
filtering the laser scanner data in dependence of the retrieved position and orientation of the terrestrial based mobile mapping vehicle to obtain laser points corresponding to regions of interest;
retrieving a source image associated with the retrieved position and orientation of the terrestrial based mobile mapping vehicle;
mapping the obtained laser points corresponding to regions of interest to image coordinates of the retrieved source image to generate a recognition mask;
combining the generated recognition mask and the retrieved source image to obtain candidate 3D Images representative of possible objects within the regions of interest; and
,detecting a group of objects from the obtained candidate 3D Images.
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Abstract
A method of detecting objects from terrestrial based mobile mapping data is disclosed, wherein the terrestrial based mobile mapping data has been captured by way of a terrestrial based mobile mapping vehicle driving on a road having a driving direction, the mobile mapping data including laser scanner data, source images obtained by at least one camera and position and orientation data of the vehicle, wherein the laser scanner data includes laser points, each laser point having associated position and orientation data, and each source image comprises associated position and orientation data. In at least one embodiment, the method includes: retrieving a position and orientation of the vehicle; filtering the laser scanner data in dependence of the position and orientation of the vehicle to obtain laser points corresponding to regions of interest; retrieving a source image associated with the position and orientation of the vehicle; mapping the laser points corresponding to regions of interest to image coordinates of the source image to generate a recognition mask; combining the recognition mask and the source image to obtain candidate 3D images representative of possible objects within the regions of interest; and, detecting a group of objects from the candidate 3D images. By combining image recognition and laser scanner recognition the detection rate can be increased to a very high percentage, thereby substantially reducing human effort. Furthermore, the generating of regions of interest in the laser data, enables a significant reduction of the processing power and/or the processing time needed to detect the objects in the images.
22 Citations
18 Claims
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1. Method of detecting objects from terrestrial based mobile mapping data, wherein the terrestrial based mobile mapping data has been captured by way of a terrestrial based mobile mapping vehicle driving on a road having a driving direction, the mobile mapping data including laser scanner data, source images obtained by at least one camera and position and orientation data of the terrestrial based mobile mapping vehicle, wherein the laser scanner data includes laser points, each laser point having associated position and orientation data, and each source image comprises associated position and orientation data, the method comprising:
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retrieving a position and orientation of the terrestrial based mobile mapping vehicle; filtering the laser scanner data in dependence of the retrieved position and orientation of the terrestrial based mobile mapping vehicle to obtain laser points corresponding to regions of interest; retrieving a source image associated with the retrieved position and orientation of the terrestrial based mobile mapping vehicle; mapping the obtained laser points corresponding to regions of interest to image coordinates of the retrieved source image to generate a recognition mask; combining the generated recognition mask and the retrieved source image to obtain candidate 3D Images representative of possible objects within the regions of interest; and
,detecting a group of objects from the obtained candidate 3D Images. - View Dependent Claims (2, 3, 4, 5, 6, 7, 9, 11, 12, 13, 14, 17)
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8. Method of detecting objects from terrestrial based mobile mapping data, wherein the terrestrial based mobile mapping data has been captured by way of a terrestrial based mobile mapping vehicle driving on a road having a driving direction, the mobile mapping data including laser scanner data, source images obtained by at least one camera and position and orientation data of the terrestrial based mobile mapping vehicle, wherein the laser scanner data includes laser points, each laser point having associated position and orientation data, and each source image comprises associated position and orientation data, the method comprising:
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retrieving a position and orientation of the terrestrial based mobile mapping vehicle; filtering the laser scanner data in dependence of the position and orientation of the terrestrial based mobile mapping vehicle to obtain laser points corresponding to obtain first regions of interest; retrieving a source image associated with the position and orientation of the terrestrial based mobile mapping vehicle; mapping the obtained laser points corresponding to the first regions of interest to image coordinates of the retrieved source image to generate a first recognition mask; combining the generated first recognition mask and the retrieved source image to obtain first candidate 3D images representative of the first regions of interest; detecting a first group of objects in dependence of the driving direction from the obtained first candidate 3D images; filtering the laser scanner data in dependence of the position and orientation of the terrestrial based mobile mapping vehicle and the local depth consistency of the laser scanner data to obtain laser points corresponding to second regions of interest; mapping the obtained laser points corresponding to the second regions of interest to image coordinates of the retrieved source image to generate a second recognition mask; combining the generated second recognition mask and the retrieved source image to obtain second candidate 3D images representative of the second regions of interest; detecting a second group of objects from the obtained second candidate 3D images; and combining the detected first and second group of objects. - View Dependent Claims (15, 16, 18)
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10. An apparatus for capturing objects for use in a map database, the apparatus comprising:
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input device; a processor readable storage medium; and a processor in communication with said input device and said processor readable storage medium; and an output device to enable the connection with a display unit, said processor readable storage medium storing code to program said processor to perform detection of objects from terrestrial based mobile mapping data, wherein the terrestrial based mobile mapping data has been captured by way of a terrestrial based mobile mapping vehicle driving on a road having a driving direction, the mobile mapping data including laser scanner data, source images obtained by at least one camera and position and orientation data of the terrestrial based mobile mapping vehicle, wherein the laser scanner data includes laser points, each laser point having associated position and orientation data, and each source image includes associated position and orientation data, the processor being useable to; retrieve a position and orientation of the terrestrial based mobile mapping vehicle; filter the laser scanner data in dependence of the retrieved position and orientation of the terrestrial based mobile mapping vehicle to obtain laser points corresponding to regions of interest; retrieve a source image associated with the retrieved position and orientation of the terrestrial based mobile mapping vehicle; map the obtained laser points corresponding to regions of interest to image coordinates of the source image to generate a recognition mask; combine the generated recognition mask and the retrieved source image to obtain candidate 3D images representative of possible objects within the regions of interest; detect a group of objects from the obtained candidate 3D images; and store the detected group of objects on the storage medium for characterizing the object.
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Specification