Pseudorandom bar code applied to digital level bar code ruler

A technology of digital level and bar code ruler, which is applied in the direction of measuring scale, movable mark, measuring point mark, etc., can solve the problems of inability to realize productization and limit the acquisition of theoretical achievements, and achieve the purpose of expanding the scope, increasing the amount of information, and reducing the field of view The effect of scope requirements

Inactive Publication Date: 2012-09-05
丁梅 +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods are feasible in theory, but in the actual measurement process, many objective factors limit the acquisition of theoretical results, and cannot be commercialized

Method used

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  • Pseudorandom bar code applied to digital level bar code ruler
  • Pseudorandom bar code applied to digital level bar code ruler
  • Pseudorandom bar code applied to digital level bar code ruler

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Embodiment Construction

[0022] The working principle of the present invention will be further described below in conjunction with the drawings and embodiments.

[0023] 1. Stripes: Stripes are the carrier of pseudo-random sequences, which have two basic characteristics, namely lightness and width. In the present invention, only two kinds of brightness stripes are used, that is, bright stripes and dark stripes. In this embodiment, bright is white and dark is black, but light and dark refer to the contrast meaning of optical brightness, which is not limited to white and black. Contains other color schemes that vary in brightness, such as black and yellow. When the width of the stripes is modulated by a pseudo-random sequence, any combination of widths can reflect the law of the pseudo-random sequence. The embodiment of the present invention has stripes of four widths, which are 4cm, 3cm, 1.2cm, and 0.6cm. According to the needs of the actual situation, you can also choose a combination of stripes with...

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Abstract

The invention discloses a pseudorandom bar code applied to a digital level bar code ruler, belonging to the technical field of manufacture of instruments of surveying and mapping. The pseudorandom bar code is formed by alternatively arranging a plurality of light and shade stripes with different widths, wherein the widths and light and shade changes of the strips are modulated by a plurality of pseudorandom sequences. The strips in the bar code comprise coarse code strips for remote measurement and thin code strips for close measurement. The thin code strips are formed by alternatively arranging light and shade strips with smaller widths, and the width changes of the light strips and shade strips are respectively modulated by a pseudorandom sequence. The coarse code strips are formed by arranging light and shade strips with bigger widths, and the widths and light and shade changes of the strips are modulated by a pseudorandom sequence. The coarse code strips are regularly embedded in the fine code strips to form a complete bar code. The pseudorandom bar code is characterized in that a plurality of pseudorandom sequences are alternatively coded for modulating the widths and light and shade changes of the strips. The pseudorandom bar code has the advantages of compatibility with remote measurement and close measurement, capability of forward measurement and backward measurement, simplicity in making a staff gauge, low requirement for a hardware system, small decoding operand, and rapidness and accuracy in identification.

Description

technical field [0001] The technology belongs to the technical field of surveying and mapping instrument manufacturing. Background technique [0002] The coding and decoding principles of the existing digital level bar code ruler mainly include correlation method, phase method and geometric method. The typical representative of the correlation method is Leica Company. Its scale is directly composed of white stripes and black stripes with different widths arranged vertically. The combination order of the stripes with different widths reflects the height information. The scale is composed of three kinds of codes. The height information is obtained by measuring the code phase difference in the code segment, and the object-to-image ratio is obtained through the reference code. The patent numbers are 93121271.5 and 01137724.0; the typical representative of the geometric method is Trimble, and its scale adopts biphase codes structure, the patent number is DE0019826871C1. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C15/06
Inventor 丁梅姚雪李大乾杨宇卓
Owner 丁梅
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