Apparatus for position data acquisition and an apparatus for coil position recognition
First Claim
1. A position data acquisition apparatus for providing position data with respect to an object, said apparatus comprising:
- a TV camera;
a laser light source;
a difference circuit for calculating a difference signal between a first image data taken with said TV camera while said laser light source is off and a second image data taken with said TV camera while said laser light source is on;
a binarization circuit for binarizing an image data signal from said difference circuit by comparing said image data signal with a threshold value; and
an integrating circuit for integrating outputs of said binarization circuit for a frame and for producing the position data output.
1 Assignment
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Accused Products
Abstract
An apparatus for recognizing a position, a diameter and a width of a cylindrical object such as a coil made of thin steel plate being wound while observed by a TV camera in unmanned manner. The coil is irradiated with laser light while the laser light is moved in the direction perpendicular to an axial direction of the coil. An image data by the laser light is obtained from a difference of image data in the case where the coil is irradiated with the laser light and in the case where the coil is not irradiated with the laser light. The image data is analyzed to obtain data such as the position and the like. In order to improve an S/N ratio of the image data, the difference signal is binarized and then integrated for a frame. Influence of the background light can be minimized and a memory capacity for the image data can be reduced.
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Citations
3 Claims
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1. A position data acquisition apparatus for providing position data with respect to an object, said apparatus comprising:
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a TV camera; a laser light source; a difference circuit for calculating a difference signal between a first image data taken with said TV camera while said laser light source is off and a second image data taken with said TV camera while said laser light source is on; a binarization circuit for binarizing an image data signal from said difference circuit by comparing said image data signal with a threshold value; and an integrating circuit for integrating outputs of said binarization circuit for a frame and for producing the position data output.
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2. A position recognition apparatus of a cylindrical object, said apparatus comprising:
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a laser light source, a scanning mirror for converting spot light of said laser light source into one-dimensional slit light, two TV cameras for photographing the slit light irradiating said cylindrical object, an A-D converter for digitizing image signals of said TV cameras and providing a digitized image data, a position data acquisition apparatus for extracting a laser slit image from the digitized image data, a coordinate conversion unit for converting position data of the laser slit image into three-dimensional position coordinates, an operation unit for calculating a center position and a radius of said cylindrical object on the basis of the three-dimensional position coordinates in the radial direction of the cylindrical object, an end point detection unit for detecting position data of both ends of the laser slit image on said cylindrical object on the basis of the three-dimensional position coordinates in the width direction of said cylindrical object and calculating a width of said cylindrical object, wherein said position data acquisition apparatus comprising; a difference circuit for calculating a difference signal between a first image data taken with said TV cameras while said laser light source is off and a second image data taken with said TV cameras while said laser light source is on; a binarization circuit for binarizing an image data signal from said difference circuit by comparing said image data signal with a threshold value; and an integrating circuit for integrating outputs of said binarization circuit for a frame and for producing the laser slit image. - View Dependent Claims (3)
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Specification
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- Resources
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Current AssigneeMitsubishi Jukogyo Kabushiki Kaisha (Mitsubishi Heavy Industries, Ltd.)
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Original AssigneeMitsubishi Jukogyo Kabushiki Kaisha (Mitsubishi Heavy Industries, Ltd.)
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InventorsYoshikawa, Hirofumi, Horimoto, Koji, Murata, Itsuo, Kunimitsu, Satoshi, Kawada, Noriyuki, Okai, Takashi
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Primary Examiner(s)LEE, RICHARD J
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Application NumberUS07/978,957Time in Patent Office2,892 DaysField of Search358/107, 358/167US Class Current348/95CPC Class CodesG01B 11/024 by means of diode-array sca...
