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Scanning line processing based automatic reading method for pointer instrument

An automatic reading, pointer technology, applied in the field of image processing research, can solve problems such as unsatisfactory accuracy, achieve good recognition effect, meet real-time requirements, and reduce pointer detection time.

Inactive Publication Date: 2016-07-06
JINAN UNIVERSITY
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  • Application Information

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Problems solved by technology

To a certain extent, these methods can reduce the number of pixels for Hough transform and improve the detection speed, but the detection accuracy is still not ideal.

Method used

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  • Scanning line processing based automatic reading method for pointer instrument
  • Scanning line processing based automatic reading method for pointer instrument
  • Scanning line processing based automatic reading method for pointer instrument

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Embodiment 1

[0046] see figure 1 , the present embodiment is an automatic reading method of a pointer meter based on scanning line processing, which can be divided into two parts, the first part is pointer image preprocessing, and the second part is pointer detection and reading, the following is combined with the accompanying drawings The methods involved in each part are described in detail.

[0047] 1. Pointer image preprocessing

[0048] During the image acquisition process, due to the uneven ambient light (such as being blocked by foreign objects) or the local reflection caused by the glass lens of the instrument itself, the brightness of the collected image will also be unbalanced, which will seriously affect the later image. accurate segmentation. In this embodiment, the single-scale Retinex algorithm is used to perform illumination processing on the original image, then the image is binarized, and then morphological processing is performed to connect the pointers of the breakpoin...

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Abstract

The invention discloses a scanning line processing based automatic reading method for a pointer instrument. The method comprises the steps of firstly performing illumination processing on an original image by adopting a single-scale Retinex algorithm, binarizing the image, then extracting characteristic pixel points by a row scanning line processing based method, performing Hough conversion on the characteristic pixel points to detect a straight line of a pointer, and finally calculating a read number by adopting an angle method, wherein the row scanning line processing based method refers to a method for scanning each row in the image, extracting continuous segments in the row, searching for the continuous segments with the lengths smaller than or equal to the line width of the pointer and taking the line segment midpoints of the continuous segments as the characteristic pixel points. According to the method, due to the adoption of the Retinex algorithm, the influence of non-uniform illumination on subsequent algorithms can be reduced; and due to the adoption of the row scanning line processing based method, the number of pixel points participating in Hough conversion can be reduced, thereby reducing the calculation amount.

Description

technical field [0001] The invention relates to the research field of image processing, in particular to an automatic reading method of a pointer type meter based on scanning line processing. Background technique [0002] Due to the advantages of simple structure, low price, and easy maintenance, pointer meters are still widely used in electric power, transportation and residents' life. The accuracy and speed of manual readings are easily affected by their own factors. Especially in the face of some meter reading problems in harsh environments that are not suitable for people to approach, an automatic meter reading technology is needed to replace manual reading. Because machine vision has more advantages than human physiological vision, it is more accurate, objective and stable, so image recognition technology has become an important application method for automatic reading of pointer meters. [0003] Most of the current automatic reading algorithms for pointer-type meters...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00
CPCG06V20/20
Inventor 孔锐揭英达程霖
Owner JINAN UNIVERSITY
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