CN107014348A

CN107014348A - A kind of scale bar code and its coding-decoding method for ranging electronic level levelling rod

Info

Publication number: CN107014348A
Application number: CN201710209401.1A
Authority: CN
Inventors: 康俊涛; 张亚州; 李豪; 邹立; 马雷; 邱奕龙
Original assignee: Wuhan University of Technology WUT
Current assignee: Wuhan University of Technology WUT
Priority date: 2017-03-31
Filing date: 2017-03-31
Publication date: 2017-08-04
Anticipated expiration: 2037-03-31
Also published as: CN107014348B

Abstract

The invention discloses a kind of scale bar code and its coding-decoding method for ranging electronic level levelling rod, the scale bar code is made up of chequered with black and white bar code, characterized in that, the blackstreak code has identical width, white stripes code has different width；Each code element is made up of two white stripes codes and a blackstreak code, and two groups of adjacent code elements share a white stripes code.Scale bar code of the present invention and its coding-decoding method have decoding computing simple, ranging electronic level has been widened the use scope of spirit level with the function of measurement distance while elevation is measured.

Description

A kind of scale bar code and its coding and decoding for ranging electronic level levelling rod Method

Technical field

The present invention relates to instrument of surveying and mapping technology, more particularly to a kind of scale bar code for ranging electronic level levelling rod And its coding-decoding method.

Background technology

The decoding process of current electronic level mainly has correlation method, geometric method and phase method.Correlation method and geometric method Coded system is complicated, and the calculating time needed for decoding is longer, and measuring speed is slow, is unfavorable for the measurement of field operation environment.Existing electricity The measurement accuracy of sub- spirit level is not high, in 0.1mm or so, and main cause is exactly electronic level in decoding merely with one-dimensional Phase spectrum in the phase spectrum and spirit level of black and white bar code composition is compared, the height according to where phasometer calculates middle silk, So merely with one-dimension information, precision, which certainly will be difficult to meet, to be required.And now can be with the electronic level precision of measurement distance It is relatively low, use is typically only made reference, and generally require also to adjust the distance while height is measured in Practical Project measurement to be surveyed Amount, and ensure its precision.Total powerstation can be with measurement distance and height, but the complex operation of total powerstation, in field operation operation Take long enough to carry out Levelling operation to it, and it is expensive.

The content of the invention

The technical problem to be solved in the present invention is to be used for ranging electronic water there is provided one kind for defect of the prior art The scale bar code and its coding-decoding method of quasi- instrument levelling rod.

The technical solution adopted for the present invention to solve the technical problems is：It is a kind of for ranging electronic level levelling rod Scale bar code, the scale bar code is made up of chequered with black and white bar code, it is characterised in that the blackstreak code has identical Width, white stripes code have different width；Each code element is made up of two white stripes codes and a blackstreak code, Two groups of adjacent code elements share a white stripes code.

By such scheme, the aligned transfer of the width of white stripes code to set.

By such scheme, the aligned transfer of the width of the white stripes code is：

White bar code Breadth Maximum is 1.5 times of black bar code, and Breadth Maximum is 0.3 times of black bar code, remaining white bar code Width is interval interior by linear interpolation herein.

By such scheme, to ensure the bar code uniformity of scale, the aligned transfer of the width of the white stripes code is：

By such scheme, the width ratio of 3 bar codes of any two groups of code elements is differed on the scale.

A kind of coding-decoding method for ranging electronic level levelling rod, it is characterised in that decoding is by following steps Composition：

1）Using median filtering algorithm by the code element greyscale image transitions of acquisition be bianry image；

2）Bianry image is split using mean-shift algorithms, and the code according to belonging to silk in the determination of middle silk position Member；

3）The up-and-down boundary straight line of each striped in code element is determined using least square method, striped is determined according to the distance between straight line Width, and determine according to the width ratio of 3 stripeds the height of code element；

4）According to middle silk position by striped where middle silk be divided into above and below two parts, and determined according to two-part width ratio up and down The height of middle silk, i.e. measurement gained height.

5）The imaging width and image distance of black bar code in the code element according to where middle silk, with reference to Similar Principle of Triangle, meter Sighting distance is calculated, namely needs the distance of measurement.

The beneficial effect comprise that：The present invention has decoding computing simple, can be surveyed while elevation is measured Span from function, widened the use scope of spirit level.

Brief description of the drawings

Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：

Fig. 1 is one section of striped after coding method coding of the present invention；

Fig. 2 is image of the coding/decoding method of the present invention after the segmentation of mean-shift algorithms；

Fig. 3 is the instrumentation plan of striped where silk in coding/decoding method of the present invention；

Fig. 4 is coding/decoding method range measurement schematic diagram of the present invention.

Embodiment

In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention It is further elaborated.It should be appreciated that specific embodiment described herein is not used to limit only to explain the present invention The fixed present invention.

As shown in figure 1, a kind of example skeleton diagrams of the Fig. 1 for the present invention.Black bar code has identical width in figure, white Bar code has different width.Each code element is made up of the bar code of two white, one black, and two code elements share a white Bar code.Three stripe width ratios differences of each code element on one ruler.

The aligned transfer of width of white stripes code is：

Three stripe width ratios of code element where silk determine the height of code element in during decoding, corresponding to middle silk 2 Height is determined by following steps.

1. it is bianry image by the Quick Response Code greyscale image transitions of acquisition to use median filtering algorithm

2. bianry image is split using mean-shift algorithms, and according to belonging to silk in the determination of the middle position of silk 2 Code element.

3. up-and-down boundary straight line L1, L2, L3, L4 of each striped in code element are determined using least square method, according to straight line Between determine the width of striped apart from d1, d2, d3, and according to the width ratio d1 of 3 stripeds：d2：D3 determines the height of code element.

4. in silk position by striped where middle silk be divided into above and below two parts, and according to two-part width ratio up and down d4:The height of silk 2 during d5 is determined, i.e. measurement gained height.

The developed width d1 of the measurement of distance black bar code in the place code element of silk 2 in, imaging width d7 and picture Away from determination.Due to known to the developed width of black code and fixed, according to Similar Principle of Triangle, sighting distance can be extrapolated, namely Need the distance of measurement.

It should be appreciated that for those of ordinary skills, can according to the above description be improved or converted, And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.

Claims

1. a kind of scale bar code for ranging electronic level levelling rod, the scale bar code is by chequered with black and white striped code character Into, it is characterised in that the blackstreak code has identical width, and white stripes code has different width；Each code element It is made up of two white stripes codes and a blackstreak code, two groups of adjacent code elements share a white stripes code.

2. scale bar code according to claim 1, it is characterised in that rule of the width of the white stripes code to set Arrangement.

3. scale bar code according to claim 2, it is characterised in that the aligned transfer of the width of the white stripes code For：

The Breadth Maximum of white bar code is 1.5 times of black bar code, and minimum widith is 0.3 times of black bar code, remaining white bars Code width is interval interior by linear interpolation herein.

4. scale bar code according to claim 1, it is characterised in that 3 bar codes of any two groups of code elements on the scale Width ratio differ.

5. a kind of coding-decoding method for ranging electronic level levelling rod, it is characterised in that decoding is by following steps group Into：

4）According to middle silk position by striped where middle silk be divided into above and below two parts, and determined according to two-part width ratio up and down The height of middle silk, i.e. measurement gained height；

5）The imaging width and image distance of black bar code, with reference to Similar Principle of Triangle, are calculated in the code element according to where middle silk Sighting distance, namely need the distance of measurement.