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Vision transducer calibrating and positioning device based on active light source

A visual sensor and active light source technology, applied in the field of measurement, can solve the problems of affecting the measurement accuracy of the visual sensor, the detection accuracy of feature points, and the difficulty of obtaining high precision, so as to improve the calibration and positioning accuracy, improve the imaging quality, and facilitate design The effect of processing

Inactive Publication Date: 2010-09-22
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Since the calibration device itself does not emit light, but only relies on the external ambient light to produce this contrast effect, it has high requirements for the calibration site environment. The light is dark, there is interference light, or the reflection of the calibration device itself makes the The detection accuracy of feature points is greatly reduced, which affects the measurement accuracy of the visual sensor
Moreover, with the development of visual measurement in the direction of large field of view, large size, and multiple sensors, the distance between the sensor and the sensor and the measured object is usually several meters or even more than ten meters. It is difficult to obtain high-precision feature point positions in the image at such a long distance
[0006] The calibration device of the visual sensor is usually a spatial positioning device. The measurement process applied to spatial positioning and the calibration process of the visual sensor are the same in the key step of obtaining the position of the feature point. The accuracy of the feature point extraction directly affects the positioning accuracy. Therefore, the above The problems encountered in the calibration process are also unavoidable in the positioning process

Method used

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  • Vision transducer calibrating and positioning device based on active light source
  • Vision transducer calibrating and positioning device based on active light source
  • Vision transducer calibrating and positioning device based on active light source

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Experimental program
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Embodiment 1

[0028] like image 3 Shown is the cross-sectional view at the luminous feature point. A light-emitting diode 106 is placed in the round hole of the end 104 as a light source, and a circuit board 107 is connected behind the light-emitting diode. The lead wire of the rod 103 is connected with the aviation plug interface (not shown) of the supporting part 102, so as to realize the external control of the light source.

[0029] After the light emitted by the light-emitting diode is blocked by the diaphragm, a light-emitting shape that is consistent with the diameter and roundness of the circular hole on the diaphragm is visually formed, and the geometric center of the shape image can be extracted after being imaged by the visual sensor.

[0030] Using high-precision long guide rail length measurement equipment, after obtaining the precise spatial distance between the centers of the two luminous round holes of the baseline ruler as 1255.12 mm, the luminous baseline ruler can be app...

Embodiment 2

[0034] After using a three-coordinate measuring machine to obtain the precise spatial coordinates of the centers of all round holes on the coordinate system of the calibration and positioning device, the metal calibration and positioning device can be applied to the calibration and positioning of the visual sensor. Small luminous feature points can be used for calibration and positioning of near-field visual sensors, and large luminous feature points can be used for calibration and positioning of large-field visual sensors.

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Abstract

The invention relates to a vision sensor calibration and location device based on an active light source, in particular to the calibration and location device of a vision sensor, belonging to the calibration device in the measuring field. The calibration and location device mainly solves the problem that the existing visual calibration and location device is limited in the application on the occasions such as poorer site environmental lighting, unstable illumination, darker light, excessive obtrusive light and the like, and breaks through the technology choke point that the existing device can not be used at a further distance. The calibration and location device adopts the controllable active light source technology and utilizes the light source to strengthen light and shade contrast of characteristic points and the surrounding environment, so as to improve the imaging quality of the characteristic points on the vision sensor, greatly lower the requirements for the environment lighting, and improve the detection precision of the characteristic points as well as the calibration and location accuracy of the vision sensor.

Description

【Technical field】 [0001] The invention belongs to a calibration and positioning device in the field of measurement, in particular to a calibration and positioning device of a visual sensor. 【Background technique】 [0002] Visual detection and measurement technology has been widely used in the fields of national economy, scientific research and national defense construction. It has the advantages of non-contact, high precision and fast speed. Vision sensors used for visual inspection generally include one or more cameras and other auxiliary measurement devices such as lasers, grating projectors, and so on. The sensor must be calibrated before use. Through calibration, the internal parameters of each camera in the sensor, that is, the corresponding relationship between the pixel position of the camera image and the point in the actual space; and the external parameters of each camera, that is, between cameras, between cameras and lasers, Spatial positional relationship betwee...

Claims

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Application Information

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IPC IPC(8): G01B11/00
Inventor 张广军孙军华刘谦哲吴子彦杨珍
Owner BEIHANG UNIV