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Pointer position extracting method of multi-dial pointer type instrument

A technology of pointer position and extraction method, which is used in instruments, character and pattern recognition, computer parts and other directions, and can solve the problems that the position of the small pointer cannot be extracted, and the small pointer of the instrument cannot be recognized.

Inactive Publication Date: 2017-02-22
SHANDONG MEASUREMENT SCI RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional instrument identification is mainly for instruments with a single pointer. Some instrument panels are distributed with dials and pointers of different sizes (such as dial indicators). The small pointer on the instrument, the position of the small pointer cannot be extracted

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  • Pointer position extracting method of multi-dial pointer type instrument

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Embodiment Construction

[0016] Attached below figure 1 The present invention will be further explained.

[0017] A method for extracting the pointer position of a multi-dial pointer instrument includes:

[0018] a) Collect the original image of the dial area of ​​the pointer instrument, and input the collected original image into the computer. b) Use a computer to perform grayscale processing on the original image to convert the original image from a color image to a grayscale image. Since color images are generally in RGB format, each pixel is composed of R (red), G (green), and B (blue). Color) consists of three components. For 24-bit true color, each component needs to be represented by 1 byte. The data storage capacity is large and difficult to process. Therefore, it is necessary to convert color images to grayscale images. Gray-scale images only contain brightness information, not color information, thus reducing the amount of computer data processing. c) Binarize the gray image with the computer,...

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Abstract

A pointer position extracting method of a multi-dial pointer type instrument comprises the steps of a), inputting an acquired original image into a computer; b), converting the acquired original image into a gray-scale image; c), performing binarization processing, and obtaining an instrument edge in the image by means of a Canny edge detection algorithm; d), performing detection circularizing processing on the image in the instrument edge by means of a computer through a Hough gradient method; e), establishing a square outside the excircle of a small dial by means of the computer; and f), acquiring a linear segment of the image in a square area by means of the computer through a Hough line transform algorithm. If a large pointer of a large dial is intersected with the excircle of a small dial, and distances between two intersection points (namely a point D and a point E) and a circle center O of a pointer seat of the small dial in the square area is 0.9-1.1 times of the radius of the excircle of the small dial, a line segment is deleted and finally one linear segment is obtained in the square area, wherein the line segment is the position of a small pointer in the image, thereby effectively preventing an error of mis-determining the large pointer as the small pointer.

Description

Technical field [0001] The invention relates to a pointer position extraction method of a multi-dial pointer type instrument. Background technique [0002] Pointer instruments are one of the most common measuring instruments used in the production process, not only in many types, but also in large numbers. At present, most of the domestic verification work for this type of instrument uses manual observation of the pointer readings of the instrument panel. This traditional method is affected by other subjective factors such as the operating experience and mental state of the inspector, and has high labor intensity, low production efficiency, Problems such as large detection errors and poor reliability. In addition, in harsh working environments such as high temperature, radiation, and the field, it is usually not suitable for manual monitoring of the readings of pointer instruments. In this case, image recognition has been more and more used, and the key technology is Extraction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/46G06K9/38G06K9/44
CPCG06V10/28G06V10/34G06V10/443G06V2201/02
Inventor 孙勇李万升赵玉成姜威刘阳于向阳李振宇
Owner SHANDONG MEASUREMENT SCI RES INST