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US 2010/0246974 A1Published application
Device and method for optically detecting surface defect of round wire rod
AssigneePosco
InventorsSe Ho Choi, Ho Mun Bae, Hwa Won Hwang, Chang Hyun Park
Life of this patent
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Abstract
A device and method can optically detect a defect of a round wire rod to be tested, and particularly, remotely detect the defect without contact in real-time. The device includes a lighting device for emitting circular surface light to the round wire rod; an optical sensor for generating an optical signal by receiving the light reflected from the round wire rod, which is being transported, and converting the optical signal into an image signal; and a signal-processing unit for acquiring surface information of the round wire rod by receiving the image signal from the optical sensor.
Claims16
1-18. (canceled)
A device for optically detecting a defect of a round wire rod, comprising:
- a lighting device for emitting circular surface light to the round wire rod;
- an optical sensor for generating an optical signal by receiving light emitted by the lighting device and reflected from the round wire rod, which is being transported, and converting the optical signal into an image signal;
- and
- a signal-processing unit for acquiring surface information of the round wire rod by receiving the image signal from the optical sensor,
- wherein an angle ranging from 50° to 90° is defined between a direction in which the optical sensor receives the reflected light from the round wire rod and a transporting direction of the round wire rod.
2 more elements
A device for optically detecting a defect of a round wire rod, comprising:
- a lighting device for emitting circular surface light to the round wire rod;
- an optical sensor for generating an optical signal by receiving light emitted by the lighting device and reflected from the round wire rod, Which is being transported, and converting the optical signal into an image signal;
- and
- a signal-processing unit for acquiring surface information of the round wire rod by receiving the image signal from the optical sensor,
- wherein an angle ranging from 45° to 65° is defined between a light-emitting direction of the lighting device and a transporting direction of the round wire rod.
2 more elements
A device for optically detecting a defect of a round wire rod, comprising:
- a lighting device for emitting circular surface light to the round wire rod;
- an optical sensor for generating an optical signal by receiving light emitted by the lighting device and reflected from the round wire rod, which is being transported, and converting the optical signal into an image signal;
- and
- a signal-processing unit for acquiring surface information of the round wire rod by receiving the image signal from the optical sensor,
- wherein an angle ranging from 45° to 60° is defined between a light-emitting direction of the lighting device and a vertical radial direction of the round wire rod.
2 more elements
A device for optically detecting a defect of a round wire rod, comprising:
- a lighting device for emitting circular surface light to the round wire rod;
- an optical sensor for generating an optical signal by receiving light emitted by the lighting device and reflected from the round wire rod, which is being transported, and converting the optical signal into an image signal;
- a signal-processing unit for acquiring surface information of the round wire rod by receiving the image signal from the optical sensor;
- and
- an optical filter provided under the optical sensor, wherein the optical filter receives the reflected light from the round wire rod, transmits a blue wavelength band to be sent to the optical sensor, and interrupts the transmission of an infrared wavelength band.
2 more elements
A device for optically detecting a defect of a round wire rod, comprising:
- a lighting device for emitting circular surface light to the round wire rod;
- an optical sensor for generating an optical signal by receiving light emitted by the lighting device and reflected from the round wire rod, which is being transported, and converting the optical signal into an image signal;
- a signal-processing unit for acquiring surface information of the round wire rod by receiving the image signal from the optical sensor;
- and
- a luminance controller for detecting a current supplied to the lighting device and monitoring light emitted from the supplied current.
2 more elements
A method for optically detecting a defect of a round wire rod, comprising:
- acquiring an image of the round wire rod from an optical sensor, and filtering the acquired image;
- performing second-order partial differentiation on a first linear image acquired in the direction perpendicular to a transporting direction of the round wire rod, averaging second-order partial differentiation values of the first linear image, and setting the averaged value as a first threshold;
- performing second-order partial differentiation on a second linear image acquired in the direction perpendicular to the transporting direction of the round wire rod, and removing the first linear image and accumulating the second linear image if a difference between each second-order partial differentiation value of the first linear image and the first threshold is within a predetermined range;
- averaging second-order partial differentiation values of the second linear image, and setting the averaged value as a second threshold;
- performing second-order partial differentiation on a second linear image acquired in the direction perpendicular to the transporting direction of the round wire rod, and repeating zooming of pixels of the second linear image up to a predetermined number of times if a difference between each second-order partial differentiation value of the second linear image and the second threshold is within a predetermined range;
- and
- detecting the second linear image pixels as had pixels if the second linear image pixels are not converted into a single pixel.
4 more elements
Dependencies are inferred from the claim text.