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A computer vision digitalized measuring scale system

A technology of machine vision and ruler, which is applied in the direction of instruments, measuring devices, indication of measured values, etc., can solve the problems of easy misreading and system accidental errors, so as to improve reliability, reduce system accidental errors, and improve the degree of automation Effect

Inactive Publication Date: 2009-03-04
BEIHANG UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to overcome the shortcomings of the above reading system, someone uses a CCD camera instead of the human eye to read, and directly transfers the image of the optical scale acquired by the camera to the computer, and the computer processes the value of the scale, but the reading program needs to go through image preprocessing, character extraction, character A series of complex processes such as segmentation and character recognition are prone to misreading, which will bring great accidental errors to the system

Method used

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  • A computer vision digitalized measuring scale system
  • A computer vision digitalized measuring scale system
  • A computer vision digitalized measuring scale system

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Embodiment Construction

[0026] Such as figure 1 As shown, one embodiment of the present invention is made up of light source, condenser lens, absolute code digitization scale, imaging objective lens, CCD processing circuit and computer, wherein on the absolute code digitization scale, there are only engraved lines without numbers, and different forms of engraved lines are used to represent numbers, The value at the location of the engraved line is represented by the binary code line segment of the number. The system uses the scale as the length reference. The light emitted by the illumination source passes through the optical system and becomes parallel light and projects on the digital scale. The scale image is imaged to the CCD by the imaging objective lens. On the photosensitive surface of the camera, the image collected by the CCD camera is sent to the computer through the processing circuit, and the computer performs a series of image processing processes such as smoothing and denoising, edge ext...

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Abstract

A digitalized scale rule system for machine is composed of a light source for lighting an absolute-code digitalized scale rule, an absolute-code digitalized scale rule for providing a length reference, a CCD device for converting the light signal on said scale rule to electric signals and then to video signals through filter and amplifying, a processor for transmitting the video signals to computer while filtering and A / D conversion, and a computer for processing image data to obtain the scale value and displaying it.

Description

technical field [0001] The invention relates to a digital scale system using machine vision technology and absolute code scale. Background technique [0002] The scales of existing measuring instruments or processing instruments are mostly based on visual readings and gratings. The visual reading system has the disadvantages of cumbersome reading process, long reading time, large human error, and low degree of automation. are very limited in the field. Taking the universal tool microscope system as an example, the uncertainty of the reading part is as high as 0.8 μm, which accounts for a large proportion of the total error. Because the grating system adopts incremental code technology, it is easy to accumulate random errors and grating marking errors into the final measurement result. In order to overcome the shortcomings of the above reading system, someone uses a CCD camera instead of the human eye to read, and directly transfers the image of the optical scale acquired b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D13/00
Inventor 屈玉福浦昭邦赵慧洁
Owner BEIHANG UNIV
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