Control method for localization and navigation of mobile robot and mobile robot using the same
First Claim
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1. A mobile robot, comprising:
- an image sensor configured to obtain an image;
a second sensor configured to obtain driving information including at least a driving direction and a driving distance of the mobile robot;
a processor configured to process the image obtained by the image obtaining unit to extract a feature point and generate a descriptor for the feature point; and
a main controller configured to generate a spatial map in a driving range based on the feature point and the driving information, and control localization and navigation of the mobile robot,wherein when the localization and the navigation of the mobile robot are performed, the main controller selectively applies a first driving mode that simultaneously uses the image and the driving information when the matching degree of the obtained image and a reference image meet a threshold, and the main controller selectively applies a second driving mode that uses only the image information when the matching degree of the obtained image and a reference image do not meet the threshold;
wherein the processor generates change in brightness and direction information for n×
n sub regions divided from the obtained image and selects direction information of different two sub regions in the n×
n sub regions to generate a pair-wise combination to describe the angle difference in local direction information, and thereby generates the descriptor based on the pair-wise combination.
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Abstract
The present invention relates to a control method for the localization and navigation of a mobile robot and a mobile robot using the same. More specifically, the localization and navigation of a mobile robot are controlled using inertial sensors and images, wherein local direction descriptors are employed, the mobile robot is changed in the driving mode thereof according to the conditions of the mobile robot, and errors in localization may be minimized.
47 Citations
18 Claims
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1. A mobile robot, comprising:
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an image sensor configured to obtain an image; a second sensor configured to obtain driving information including at least a driving direction and a driving distance of the mobile robot; a processor configured to process the image obtained by the image obtaining unit to extract a feature point and generate a descriptor for the feature point; and a main controller configured to generate a spatial map in a driving range based on the feature point and the driving information, and control localization and navigation of the mobile robot, wherein when the localization and the navigation of the mobile robot are performed, the main controller selectively applies a first driving mode that simultaneously uses the image and the driving information when the matching degree of the obtained image and a reference image meet a threshold, and the main controller selectively applies a second driving mode that uses only the image information when the matching degree of the obtained image and a reference image do not meet the threshold; wherein the processor generates change in brightness and direction information for n×
n sub regions divided from the obtained image and selects direction information of different two sub regions in the n×
n sub regions to generate a pair-wise combination to describe the angle difference in local direction information, and thereby generates the descriptor based on the pair-wise combination. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A control method of localization and navigation of a mobile robot, comprising:
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(a) allowing the mobile robot to obtain image information via an image sensor and driving information of a target region via a second sensor; (b) determining, via a processor, whether the obtained image is available by comparing a quality of the obtained image information with a reference value; and (c) if it is determined that the image is available, extracting a feature point from the obtained image information, via a processor, and generating a descriptor of the extracted feature point via a main controller to create a driving map and drive in the target region; wherein when the localization and the navigation of the mobile robot are performed, the driving in the target region includes;
selecting any one of a first driving mode that simultaneously uses the image and the driving information when the matching degree of the obtained image and a reference image meet a threshold, and a second driving mode that uses only the image information when the matching degree of the obtained image and the reference image do not meet the threshold; andwherein the processor generates change in brightness and direction information for n×
n sub regions divided from the obtained image and selects direction information of different two sub regions in the n×
n sub regions to generate a pair-wise combination to describe the angle difference in local direction information and thereby generates the descriptor based on the pair-wise combination. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification