Bar code for digital level bar code ruler and electronic theodolite dial and encoding and decoding method therefor

A technology of electronic theodolite and digital level, which is applied in the direction of measuring ruler, movable mark, measuring point mark, etc. It can solve the problems of complex barcode, difficult making of ruler, and slow measurement speed.

Inactive Publication Date: 2005-06-29
WUHAN UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Looking at the existing technical methods, each has advantages and disadvantages, either the barcode is complicated and the ruler is difficult to make; or the encoding and decoding operations are complicated, the calculation is large and the measurement speed is slow or the hardware cost is high

Method used

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  • Bar code for digital level bar code ruler and electronic theodolite dial and encoding and decoding method therefor
  • Bar code for digital level bar code ruler and electronic theodolite dial and encoding and decoding method therefor
  • Bar code for digital level bar code ruler and electronic theodolite dial and encoding and decoding method therefor

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Embodiment Construction

[0017] specific implementation

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0019] The symbol and barcode structure of an embodiment of the present invention are as figure 1 shown.

[0020] 1. Code unit: each code unit is composed of a pair of light and dark stripes, the order of light and dark is consistent, and the width of each code unit is the same—that is, the width of the bright stripe plus the width of the dark stripe is equal to a fixed value; the bright in this embodiment is white , dark is black, but light and dark refer to the meaning of optical brightness contrast, not only white and black, but also other color configurations with light and dark differences in brightness, such as light yellow and dark blue.

[0021] 2. Proportional code: The code elements with different duty ratios are called proportional codes, and the coding is realized by the ratio of the width of the light and dark stripes i...

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Abstract

This invention relates to bar code used in digit water level code bar and electrical theodolite panel and its coding and decoding method. Its code elements are composed of a pair of light and dark strips with same order. The duty cycle of dark strips in the code elements at least two kinds and the code element with different duty cycle is named as proportion code. The multiple codes distributes as designed order to form the codes of digit water level and electrical theodolite panel which are characterized by the same width of each code element.

Description

technical field [0001] The technology belongs to the technical field of surveying and mapping instrument manufacturing. Background technique [0002] At present, the decoding principles of digital level barcode ruler mainly include correlation method, geometric method and phase method, and there are some other methods. The typical representative of the correlation method is the Swiss Leica instrument, the scale is directly coded in black and white binary, the patent number: DE0019530788C1; the typical representative of the geometric method is the Trimble instrument, the scale adopts biphase binary coding, the patent number: DE0019826873C1; the typical representative of the phase method It is the patent of TOPCON of Japan: 93121271.5, 01137724.0 and the patent of SOKKIA of Japan 98104318.6. The scale barcode is composed of several groups of code sequences subjected to sinusoidal modulation of different periods; there are other patents such as the equidistant code width of SOK...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C15/06
Inventor 叶晓明
Owner WUHAN UNIV
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