Grating ruler calibration method and device and visual detection device

A grating ruler and coordinate technology, applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems of inconvenient operation and inaccurate calibration accuracy.

Active Publication Date: 2019-04-16
珠海博明软件有限公司
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Problems solved by technology

[0003] The invention provides a grating ruler calibration method, device and visual detection device, which solves the

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  • Grating ruler calibration method and device and visual detection device
  • Grating ruler calibration method and device and visual detection device
  • Grating ruler calibration method and device and visual detection device

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Embodiment Construction

[0036] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0037] An embodiment of the present invention provides a grating ruler calibration method, including the following steps:

[0038] (1) Take a picture of the calibration board placed on the machine table, and the calibration board is used as a reference board for subsequent picture collection and calculation, and is covered on the loading table of the machine table. Such as figure 1 As shown in , the calibration plate is provided with a plurality of horizontal sampling areas 1 extending along the X-axis direction and located at different Y-axis positions and a plurality of longitudinal sampling areas 2 extending along the Y-axis direction and located at different X-axis positions, The horizontal sampling area 1 and the vertical sampling area 2 extend in a strip shape. Two or more horizontal sampling areas 1 and vertical sampling ...

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Abstract

The invention discloses a grating ruler calibration method and device and a visual detection device. The grating ruler calibration method comprises the following steps that (1) image sampling is carried out on a calibration plate placed on a machine table; (2) a sampled image is read, and the image coordinates of a sought point in the image, the deflection angle of the image, the grating ruler coordinates of the image and the world coordinates of the point are stored; (3) the step (2) is repeated until all the sampled images are completely read; (4) the world coordinates of the centers of allthe images are calculated through a coordinate system conversion equation, the grating ruler coordinates of the corresponding images and the world coordinates and the angle of the image centers are stored, a transverse reference line is formed in the image centers of the sampled images in the same horizontal sampling area, and a longitudinal reference line is formed in the image centers of the sampled images in the same longitudinal sampling area; and (5) the world coordinates of a to-be-detected image are determined according to the transverse reference line and the longitudinal reference line. The grating ruler calibration method can solve the problems that an existing grating ruler calibration method is inconvenient to operate and inaccurate in calibration precision.

Description

technical field [0001] The invention relates to the technical field of industrial intelligent detection, in particular to a grating ruler calibration method, device and visual detection device. Background technique [0002] In the field of industrial visual inspection, before starting the inspection, it is necessary to calibrate the grating ruler on the machine to determine the error between the measurement result of the grating ruler and the true value, and then compensate the measurement result. In the prior art, the X-axis and Y-axis are often calibrated in different directions. Specifically, the linear scale is continuously measured along the X direction (or Y direction) (the specific interval is adjusted according to the machine), and then Calculate the difference, compare the measurement result with the standard value of the linear scale, generate a comparison table between the true value of the linear scale and the value of the grating scale, and compensate the test r...

Claims

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Application Information

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IPC IPC(8): G01B11/00
CPCG01B11/00G01B21/042
Inventor 王晓城黄一格陈田田
Owner 珠海博明软件有限公司
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