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Robust pointer instrument reading automatic identification method

An instrument reading and automatic identification technology, applied in the direction of character and pattern recognition, instruments, computer components, etc., can solve the problems of instrument scale recognition errors, instrument edge occlusion, and lack of accurate positioning of the center of the dial, etc., to avoid errors, The effect of improving precision and improving automatic control efficiency

Inactive Publication Date: 2015-05-27
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0007] However, during the shooting process of the pointer instrument dial, due to changes in illumination, the edge of the instrument will block the instrument dial and produce shadows, and these shadows will cause subsequent instrument scale recognition errors; in addition, when the instrument readings are calculated, existing The technique does not give a method for precisely locating the center of the dial, which is important for the accuracy of the reading calculations

Method used

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  • Robust pointer instrument reading automatic identification method
  • Robust pointer instrument reading automatic identification method
  • Robust pointer instrument reading automatic identification method

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Embodiment Construction

[0049] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0050] combine figure 1 As shown, a robust method for automatic identification of pointer instrument readings includes the following steps:

[0051] s1. Get the dashboard image

[0052] Since there may be multiple dashboards in the same photo taken, dashboard positioning is required.

[0053] The method of the invention adopts the hough transformation method to realize the positioning of the instrument panel, and can accurately determine the instrument panel in the case of a common resolution (1280*768).

[0054] s2. Extract the intrinsic image corresponding to the dashboard image, and eliminate the shadow during the intrinsic image extraction process

[0055] Under normal lighting conditions, the edge of the instrument panel will always form a shadow in a certain direction of the instrument panel. The shadow overlaps with the scale line and ...

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Abstract

The invention belongs to the field of machine vision and pattern recognition, and particularly discloses a robust pointer instrument reading automatic identification method. The automatic identification method comprises the following steps: s1, acquiring an instrument panel image; s2, extracting an intrinsic image corresponding to the instrument panel image, and eliminating shadow during the intrinsic image extraction process; s3, determining the center of the instrument panel based on the intrinsic image, and then positioning the scale mark and the instrument pointer; s4, determining the location area of the numbers on the instrument panel and identifying the numbers in the location area on the instrument panel; s5, determining the relative relationship between the instrument pointer position and the scale mark according to the position of the instrument pointer, and obtaining instrument reading according to the scale reading. According to the method provided by the invention, the intrinsic image of the instrument panel is extracted to eliminate the shadow generated due to shielding by the edge of the instrument panel, and mistakes during subsequent identification of the scale mark and pointer of the instrument panel are prevented.

Description

technical field [0001] The invention belongs to the field of machine vision and pattern recognition, and relates to a robust automatic recognition method for pointer instrument readings. Background technique [0002] Pointer instruments are widely used in measurement work in the fields of medical treatment, machinery, chemical industry, civil engineering and petroleum exploration and development, such as gas pressure gauges for gas detection and hydraulic pressure gauges for petroleum detection. [0003] Due to their inherent advantages, these pointer instruments will still exist for a long time and will not be replaced by electronic instruments. [0004] At present, for pointer instruments, it is still necessary to manually obtain readings from the dial. [0005] Manual reading has many disadvantages, such as long time and a lot of repeated work will make the labor intensity is high, the reading error of people in the fatigue state is very large, and the scale information ...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06K9/62
Inventor 刘玉杰陈晓明封江力张昕孙梦翠
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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