MOBILE UNIT POSITION DETECTING APPARATUS AND MOBILE UNIT POSITION DETECTING METHOD
First Claim
1. A mobile unit position detecting apparatus for sequentially or intermittently shooting, with an image capturing device, a target installed in a vicinity of a route on which a mobile unit can move, and for detecting a position of the mobile unit based on the target in a shot image, comprising:
- target position extracting unit configured to identify image data that matches image data of the target in the image from among image data of a plurality of targets by making a comparison between the image data of the plurality of targets, which are recorded in a recording unit, and the image data of the target in the image, and to obtain position data that is recorded in the recording unit, is associated with the identified image data and indicates a position when the mobile unit approaches the target at a predetermined distance; and
target position outputting unit configured to output the position data if determining that the target in the image changes to a shape, recorded in the recording unit, of the target in the image when the mobile unit approaches the target at the predetermined distance.
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Abstract
The mobile unit position detecting apparatus generates target data by extracting a target from an image shot by the image capturing device, extracts target setting data that best matches the target data, is prerecorded in a recording unit and is shot for each target, obtains a target ID corresponding to the extracted target setting data from the recording unit, detects position data associated with the obtained target ID, tracks the target in the image shot by the image capturing device, and calculates an aspect ratio of the target being tracked in the image. If the aspect ratio is equal to or lower than a threshold value, the mobile unit position detecting apparatus outputs the detected position data.
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Citations
11 Claims
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1. A mobile unit position detecting apparatus for sequentially or intermittently shooting, with an image capturing device, a target installed in a vicinity of a route on which a mobile unit can move, and for detecting a position of the mobile unit based on the target in a shot image, comprising:
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target position extracting unit configured to identify image data that matches image data of the target in the image from among image data of a plurality of targets by making a comparison between the image data of the plurality of targets, which are recorded in a recording unit, and the image data of the target in the image, and to obtain position data that is recorded in the recording unit, is associated with the identified image data and indicates a position when the mobile unit approaches the target at a predetermined distance; and target position outputting unit configured to output the position data if determining that the target in the image changes to a shape, recorded in the recording unit, of the target in the image when the mobile unit approaches the target at the predetermined distance. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A mobile unit position detecting method, being executed by a computer, of sequentially or intermittently shooting, with an image capturing device, a target installed in a vicinity of a route on which a mobile unit can move, and of detecting a position of the mobile unit based on the target in a shot image, the computer including
recording by a recording unit in the computer a target ID, assigned to the target, for identifying a target, and further recording, in association with the target ID, target setting data including image data of the target shot in advance for each target, a threshold value obtained by calculating an aspect ratio based on a shape of the target in the image when the mobile unit approaches the target at a predetermined distance, and position data that indicates a position for which the threshold value is calculated, causing the computer: -
to generate target data by extracting, from the recording unit, the target from an image shot by the image capturing device, for extracting target setting data that best matches the target data, and for obtaining a target ID corresponding to the extracted target setting data, to detect the position data associated with the target ID obtained from the recording unit, and to track the target in the image shot by the image capturing device, calculating an aspect ratio of the target being tracked in the image, outputting the position data if the aspect ratio is equal to or lower than the threshold value. - View Dependent Claims (8, 9, 10, 11)
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Specification