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Method for accurately positioning and extracting lines in line tool trace image

A technology of tool traces and precise positioning, which is applied in the direction of instruments, character and pattern recognition, computer parts, etc., to achieve the effect of reducing costs, reducing the influence of human factors, accurate positioning of lines and reasonable extraction methods

Inactive Publication Date: 2016-08-10
广东警官学院
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] In order to overcome at least one of the defects described in the above-mentioned prior art, the present invention provides a method for precise positioning and extraction of lines in line tool trace images, overcomes the defects existing in the current method of manually comparing and inspecting tool traces, and can quickly and accurately locate and extract lines

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  • Method for accurately positioning and extracting lines in line tool trace image
  • Method for accurately positioning and extracting lines in line tool trace image
  • Method for accurately positioning and extracting lines in line tool trace image

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Embodiment Construction

[0029] The accompanying drawings are for illustrative purposes only, and should not be construed as limitations on this patent; in order to better illustrate this embodiment, certain components in the accompanying drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art It is understandable that some well-known structures and descriptions thereof may be omitted in the drawings. The positional relationship described in the drawings is for illustrative purposes only, and should not be construed as a limitation on this patent.

[0030] Such as figure 1 As shown, the method for precise positioning and extraction of lines in a line tool trace image includes the following steps:

[0031] S1. Input line tool trace image;

[0032] S2. Determine the comparison line;

[0033] S3. Calculate and compare the line trace grayscale projection on the line;

[0034] S4. Calculation of the second order derivative of the ...

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Abstract

The invention relates to the technical field of crime line tool trace automatic comparison methods and more specifically relates to a method for accurately positioning and extracting lines in a line tool trace image. The method for accurately positioning and extracting lines in a line tool trace image comprises following steps: S1. inputting a line tool trace image; S2. determining a comparison line; S3. calculating gray level projection of line traces on the comparison line; S4. performing edge second derivative calculation; S5. line area calculating; S6. line optimization and line center position calculating; S7. line extraction. Compared with the prior art, the method for accurately positioning and extracting lines in a line tool trace image is reasonable and efficient. By means of the method, lines in a line tool trace two-dimension image can be quickly and accurately positioned and extracted, which lays foundation for tool trace computer automatic comparison and reduces influence of man-induced factors by artificial comparison.

Description

technical field [0001] The invention relates to the technical field of an automatic comparison method for criminal line tool traces, and more specifically, to a method for accurately locating and extracting lines in an image of line tool traces. Background technique [0002] The comparative inspection of traces of criminal tools is a difficult problem in the field of trace inspection and identification. Line tool traces are the most typical type of tool traces. At present, the comparison and inspection of line tool traces all rely on manual comparison, which is labor-intensive and lacks stability and reliability. Studying the automatic comparison technology of line tool traces can reduce the labor intensity of manual comparison, enhance the stability and reliability of inspection comparisons, and make it possible to compare and determine evidence or retrieve accurate serialization cases from massive tool trace databases. The rapid and accurate positioning and extraction of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/46
CPCG06V10/44
Inventor 牟丽杨敏
Owner 广东警官学院
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