A method for obtaining visual scale coefficient based on machine vision
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A technology of proportional coefficient and acquisition method, applied in instruments, measuring devices, optical devices, etc., can solve problems such as meeting the accuracy requirements, unable to determine the visual proportional coefficient, and no feedback verification function.
Active Publication Date: 2019-01-01
NINGBO SUNNY OPOTECH CO LTD
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In addition, the traditional method of obtaining the visual scale factor has no feedback verification function, which means that the operator cannot be sure that the obtained visual scale factor meets the accuracy requirements
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[0030]The following description serves to disclose the present invention to enable those skilled in the art to carry out the present invention. The preferred embodiments described below are only examples, and those skilled in the art can devise other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents and other technical solutions without departing from the spirit and scope of the present invention.
[0031] In practical applications, automation equipment based on machine vision usually includes a camera, a computer control system and an actuator. The camera is used to acquire certain image information. The computer control system is used to process the image information obtained by the camera, and perform certain calculations to obtain the required information. At the same time, the computer control system is used to control the mechanical movement of...
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Abstract
The invention discloses a vision proportionality coefficient obtaining method based on machine vision, and the method comprises the following steps: (a), building a machine coordinate system (xj, yj) and a pixel coordinate system (xp, yp) based on machine vision recognition according to the movement directions of x-axis and y-axis, wherein the machine coordinate system (xj, yj) and the pixel coordinate system (xp, yp) are mapped to each other; (b), providing a Mark point in a camera view field, obtaining the initial pixel coordinates (xp1, yp1) of the Mark point and the machine coordinates (xj1, yj1) at this moment; (c), moving the Mark point to a second point in the view field, obtaining the pixel coordinates (xp2, yp2) of the second point and the machine coordinates (xj2, yj2), calculating and obtaining the rough vision proportionality coefficients: X'vs=(xj2-xj1) / (xp2-xp1), Y'vs=(yj2-yj1) / (yp2-yp1); (d), enabling the Mark point to be moved to a third point (xp3, yp3) in the camera view field according to the rough vision proportionality coefficients, obtaining the machine coordinates (xj3, yj3) of the third point, enabling the Mark point to be moved to a fourth point (xp4, yp4) and a fifth point (xp5, yp5) in the camera view field, obtaining the machine coordinates (xj4, yj4) and machine coordinates (xj5, yj5) at this moment, and calculating and obtaining the vision proportionality coefficients: Xvs=(xj5-xj4) / (xp5-xp4), Yvs=(yj4-yj3) / (yp4-yp3).
Description
technical field [0001] The invention relates to the field of machine vision, in particular to a method for acquiring visual scale coefficients based on machine vision. Background technique [0002] Machine vision is the use of machines instead of human eyes for measurement and judgment. The machine vision system refers to converting the ingested target into an image signal through machine vision products, sending it to a dedicated image processing system, and converting it into a digital signal according to pixel distribution, brightness, color and other information; the image system performs various operations on these signals To extract the characteristics of the target, and then control the on-site equipment action according to the result of the discrimination. [0003] The application of machine vision in automation equipment can greatly improve the flexibility of the equipment and the positioning accuracy of the actuator. In the automation equipment based on machine v...
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