A method for calibrating multi-camera visual inspection equipment

A technology of multi-camera vision and detection equipment, applied in image analysis, instrumentation, computing, etc., can solve problems such as complex operation and low efficiency
CN109920010BActive Publication Date: 2020-06-26易思维(杭州)科技股份有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
易思维(杭州)科技股份有限公司
Publication Date
2020-06-26

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Abstract

The invention discloses a method for calibrating multi-camera visual inspection equipment. The multi-camera visual inspection equipment is sleeved on industrial equipment, and N cameras are uniformlydistributed on the circumference taking the center of the detection equipment as the center of a circle, and the method comprises the following steps: 1, placing a calibration plate below the detection equipment with the calibration plate comprising a plurality of common mark circles with equal diameters and N characteristic mark circles with unequal diameters; locating The center of the common mark circle and the center of the characteristic mark circle on the same circumference. wherein the diameter of the characteristic mark circle is different from that of a common mark circle; Wherein theview field of each camera at least comprises one characteristic mark circle; enabling the N camera fields of view to cover the whole calibration plate after being spliced; utilizing an image processing method to fit circle centers and radiuses of the common mark circle and the characteristic mark circle, and determining a camera number according to the size of the characteristic mark circle; andfitting the circle center and the radius of the large circle by using the fitted circumferential contour line, and calibrating the coordinate position and the pixel equivalent of the center of the detection equipment.
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Description

technical field

[0001] The invention relates to the field of camera calibration, in particular to a method for calibrating multi-camera visual inspection equipment. Background technique

[0002] In the modern automated production process, people widely use machine vision systems in various industries. Machine vision systems can greatly improve production efficiency and automation of production, and machine vision has higher accuracy than artificial vision. With the popularization of machine vision in industry, high-precision industrial production equipment has put forward high-precision and large-field requirements for machine vision. It is difficult for a single camera to achieve high precision and large field of view at the same time. Accuracy and large field of view requirements.

[0003] However, multi-camera needs to use a high-precision calibration plate to calibrate the coordinate transformation relationship between the cameras to achieve the requirements of high pr...

Claims

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