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Image detection method for scales of non-ruler-line pointer instrument

A technology of ruler scale and ruler line, which is used in image analysis, image data processing, instruments, etc., can solve the problems of large systematic errors in automatic reading, cumbersome methods, and reduced reliability.

Active Publication Date: 2014-05-07
HUNAN UNIV
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Problems solved by technology

These methods are either too simple to apply to occasions where there is unevenness in the scale spacing, resulting in large systematic errors in automatic readings; or the methods are more cumbersome and the reliability is also reduced

Method used

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  • Image detection method for scales of non-ruler-line pointer instrument
  • Image detection method for scales of non-ruler-line pointer instrument
  • Image detection method for scales of non-ruler-line pointer instrument

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Embodiment Construction

[0108] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0109] The overall flow chart of the proposed method of the present invention is as figure 1 shown.

[0110] like figure 2 Shown is the image of the meter head of the embodiment collected according to step i and step iii of the method proposed in the present invention.

[0111] The parameter setting described in step ii is as follows, wherein the actual physical length has been converted into the corresponding image pixel length: l tick,min = 50 pixels; l tick,max = 150 pixels; w tick,max = 10 pixels; ε tick_base =10 pixels; N tick =31;k=0.5;α first = π / 6; α last =5π / 6;f peri =TRUE; υ t ={0V,1V,L,30V}.

[0112] like image 3 Shown is the binary image of the header of the embodiment obtained by segmenting steps iv to v of the method proposed in the present invention, wherein the segmentation threshold used is 128, and the ...

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Abstract

The invention discloses an automatic detection method for scales on a circular ruler of a non-ruler-line pointer instrument based on images. An image acquisition system is established and calibrated by means of a single digital camera; two gauge outfit images are shot corresponding to drive signals of 20% and 80% full scales; preliminary screening is carried out on scale areas according to secondary moment characteristics after threshold segmentation and morphological processing; secondary screening is conducted according to scale centrality and rough positions of ruler plate centers are determined; candidate scale base point sets are determined according to proximal marks given by a user, and fitting arcs are solved by combining a double-point removing disconnection least square method of a circle; the points of intersection of the candidate scales and the fitting arcs serve as detection scale base points; the results of the two images are combined to obtain the final scale base point set. Accordingly, the scale positions of the non-ruler-line pointer instrument can be automatically detected, the method can be applied to automatic calibration and automatic reading of the instrument, reading accuracy is improved and labor intensity is lightened.

Description

technical field [0001] The invention relates to the fields of meter automatic calibration and meter automatic reading, in particular to an image-based automatic detection method for the scale on a circular scale of a pointer-type meter without scale line. Background technique [0002] The pointer instrument has a simple structure and is easy to use. Not only are there a large number of pointer instruments in various systems that have been used, but even with the increasing application of digital instruments, tens of thousands of pointer instruments are produced every year. For the verification and calibration of newly produced and in-use pointer instruments, if it is done manually, it will be labor-intensive and easily affected by the supervisory factors of the inspectors. Verification and calibration of pointer instruments based on image processing is a low-cost and feasible method to solve this problem. In addition, the computer remote control and management of the exist...

Claims

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Application Information

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IPC IPC(8): G01D18/00G06T7/00G06T7/136
Inventor 郭斯羽张翌王耀南温和滕召胜黎福海周乐前孟志强刘波峰唐求唐璐
Owner HUNAN UNIV
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