Automatic calibration method of pointer type automobile meter

A technology for automatic calibration of automotive meters, applied in instruments, image data processing, calculations, etc., can solve the problems of unresponsive interval pointer indication, low batch quality of domestically produced automotive meters, meter adjustment errors and missing inspections, etc. To achieve the effect of improving the accuracy and efficiency of calibration

Inactive Publication Date: 2010-03-03
ZHEJIANG UNIV
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Problems solved by technology

During this period, the meter is often readjusted due to the difference in the accuracy of the scale between the calibration personnel and the previous meter adjustment workers. The rework rate due to human understanding factors is relatively high, which seriously affects the production efficiency.
Moreover, once the calibrator is a little relaxed during the work process, the previous meter adjustment errors will be missed.
Many instrument manufacturers have missed inspections of a certain scale point (m

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  • Automatic calibration method of pointer type automobile meter
  • Automatic calibration method of pointer type automobile meter
  • Automatic calibration method of pointer type automobile meter

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Embodiment Construction

[0037] At present, there are few domestic researches on the automatic calibration of automobile meters. Some scholars have carried out identification research on the readings of electric meters, water meters, voltmeters, etc., respectively using concentric circle search method, Hough transform method, second nearest rule, etc., but since the above methods are all processing grayscale images, image preprocessing Complicated, the extraction of target objects is inaccurate, and the requirements of high precision cannot be met, so it is not suitable for automatic calibration of automobile meters.

[0038] However, compared with other instruments, the car dashboard has its distinctive features. The color of the pointer is bright, which is quite different from the color of the dial, and the pointer is slender and easily disturbed by the light background. Therefore, the patent of the present invention proposes a method of extracting the pointer using color features under the HSI mode...

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Abstract

The invention discloses an automatic calibration method of a pointer type automobile meter based on an HIS model and Hough conversion. Aiming at the characteristic of rich color information of the automobile meter and shadow phenomenon existing at the periphery of a target area when collecting images, an instrument panel image under an RGB model is converted into the HIS model so as to eliminate shadow influence; tone and saturation component are utilized as characteristic parameters to carry out image segmentation; Hough conversion is used for detecting targets; and finally, deflection anglescorresponding to zero calibration tail when the pointer points to major calibration tails are respectively calculated and compared with corresponding standard deflection angles, and if the result exceeds permissible error range, readjustment needs to be carried out. The automatic calibration method can effectively improve the calibration correction rate and efficiency of the pointer type automobile meter, and provides powerful means for automatic production of the automobile meter.

Description

technical field [0001] The invention relates to an automatic inspection technology of an automobile meter when leaving the factory, in particular to an automatic inspection method for a pointer type automobile meter based on an HSI model and a Hough transformation. Background technique [0002] In the production of mainstream pointer-type automotive meters, meter pointer calibration is a very repetitive task, which requires calibration personnel to calibrate each adjustment scale point of each meter head. During this period, the meter is often readjusted due to the difference in the accuracy of the scale between the calibration personnel and the previous meter adjustment workers. The rework rate due to human understanding factors is relatively high, which seriously affects the production efficiency. Moreover, once the calibrator relaxes a little during the work process, the previous meter adjustment errors will be missed. Many instrument manufacturers have missed inspection...

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Application Information

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IPC IPC(8): G01D18/00G06T5/00G06T7/00
Inventor 周泓徐海儿耿晨歌何佩奇
Owner ZHEJIANG UNIV
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