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Steel band tape scale error measuring method

A technology of scale error and measurement method, applied in the direction of bendable ruler, etc., can solve the problems of low accuracy, reading error, large labor load, etc., and achieve the effect of improving measurement accuracy, ensuring accuracy, and reducing the amount of calculation.

Inactive Publication Date: 2015-12-23
成都市计量检定测试院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the entire steel tape scale error measurement process is entirely based on naked eye observation, manual identification, heavy labor, low precision, and prone to human reading errors

Method used

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  • Steel band tape scale error measuring method

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Experimental program
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Effect test

Embodiment 1

[0039] like figure 1 As shown, the method for measuring the scale error of the steel tape includes the following steps: Step 1, install and fix the inspected ruler and the standard ruler horizontally and horizontally on the verification platform; Step 2, use the camera to take pictures at the measuring point to obtain the image of the steel tape; Step 3 1. Process the steel tape image to obtain the distance pixel ratio b of the standard ruler; step 4, obtain the target scale position W1 of the standard ruler and the target scale position W2 of the inspected ruler; step 5, use the obtained standard ruler target scale position W1, Calculate the scale error of the inspected ruler from the target scale position W2 of the inspected ruler and the distance pixel ratio b, and determine whether the scale error at the measuring point of the inspected ruler meets the requirements.

[0040]In step 1 of this embodiment, both the inspected ruler and the standard ruler installed and fixed ar...

Embodiment 2

[0045] The difference between this embodiment and Embodiment 1 is that the way of obtaining the target scale position W1 of the standard ruler and the target scale position W2 of the inspected ruler is different. The specific method of obtaining the target scale position W1 of the standard ruler and the target scale position W2 of the inspected ruler in this implementation is as follows : In this embodiment, when obtaining the target scale position W1 of the standard ruler, the target scale line pattern of the standard steel tape is manually selected in the collected steel tape image, and the framed image is intercepted from the steel tape image to perform image grayscale and binary Value processing, and then horizontally scan the position of the scale line in the intercepted image (there is only one scale line in the intercepted image, the position of the target scale line can be easily obtained), and the target scale line position W1 of the standard ruler is the target scale l...

Embodiment 3

[0047] This embodiment makes the following further limitations on the basis of Embodiment 1 or Embodiment 2: This embodiment also includes manually selecting any target scale line pattern of the inspected ruler in the collected steel tape image, and the frame selection image from The steel tape is intercepted from the image for image grayscale and binarization, and the scale lines are scanned horizontally in the intercepted image to obtain the starting point and end point of the target scale line pixels of the inspected scale (the target scale line is white, and the horizontal direction is from the left. Scan to the right, from black to white is the starting point, from white to black is the end point) to get the pixel difference of the target scale line of the inspected ruler (end position - starting position), and according to the target scale line pixel of the inspected ruler The difference value and the distance pixel ratio of the standard ruler are used to calculate the ta...

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Abstract

The invention discloses a steel band tape scale error measuring method, which comprises the steps of: step 1, arranging and fixing a verified tape and a standard tape on a verification platform horizontally; step 2, adopting a camera for photographing at a measuring point to obtain a steel band tape image; step 3, processing the steel band tape image to obtain a distance-to-pixel ratio of the standard tape; step 4, acquiring a standard tape target scale position W1 and a verified tape target scale position W2; step 5, and calculating scale error of the verified tape by utilizing the acquired standard tape target scale position W1, the verified tape target scale position W2 and the distance-to-pixel ratio, and judging whether scale error of the measuring point of the verified tape meets the requirement. The steel band tape scale error measuring method is simple in process, convenient to implement and low in cost, measures steel band tape scale error based on machine vision, realizes automatic measurement of steel band tape scale error, can increase measurement accuracy, and can improve the detection efficiency.

Description

technical field [0001] The invention relates to the verification technology of a steel tape, in particular to a method for measuring the scale error of a steel tape. Background technique [0002] Steel tape is a basic length measuring instrument, widely used in industrial and agricultural production and daily life. The verification process of the steel tape is: place the inspected steel tape (the inspected ruler) and the standard steel tape (the standard ruler) on the verification platform, align the inspected ruler and the standard ruler zero scale lines, and then use the inspected ruler to measure A measurement method in which the line pattern is compared with the line pattern of the standard scale. At present, the entire steel tape scale error measurement process is entirely based on visual observation and manual identification, which is labor-intensive, low-precision, and prone to human-made reading errors. Contents of the invention [0003] The purpose of the presen...

Claims

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Application Information

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IPC IPC(8): G01B3/10
Inventor 胡平雷霆曾博才
Owner 成都市计量检定测试院
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