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Video data mining-based non-contact object vibration frequency measurement method

A technology of vibration frequency and video data, applied in measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problems of high cost, complex technology, and the inability to install vibration sensors on the measured object, so as to achieve simple equipment and adaptability Good, cheap to implement

Active Publication Date: 2016-06-08
上海航数智能科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention mainly solves the problems of complex technology and high cost in the existing technology of measuring the vibration of objects by installing contact vibration sensors on objects, and the problems that vibration sensors cannot be installed on some measured objects, and provides a simple and low-cost device. Inexpensive and adaptable method for non-contact object vibration frequency measurement based on video data mining
[0008] Another object of the present invention is to solve the problem of constraints in the non-contact object vibration measurement method in the prior art, and provide a non-contact object vibration frequency measurement method based on video data mining with simple equipment and no constraints

Method used

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  • Video data mining-based non-contact object vibration frequency measurement method

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Embodiment

[0049] In this embodiment, a method for measuring the vibration frequency of a non-contact object based on video data mining, such as figure 1 shown, including the following steps:

[0050] S1. Construct the ideal camera noise model of the digital camera used;

[0051] The construction steps specifically include:

[0052] S11. Select the zero-mean additive Gaussian white noise model as the ideal noise model of the digital camera used; the zero-mean additive Gaussian white noise model assumes that the amplitude of the ideal camera noise at each pixel follows a Gaussian distribution with a mean value of zero .

[0053] S12. Calculate the standard deviation of the Gaussian noise distribution of the selected ideal noise model. The standard deviation of the Gaussian noise distribution of the ideal noise model is the only unknown parameter of the ideal noise model. The ideal camera noise model of the digital camera used is thus constructed, which obeys the Gaussian distribution....

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Abstract

The invention relies to a video data mining-based non-contact type object vibration frequency measurement method. In the prior art, a contact type vibration transducer, installed on an object and used for measuring the vibration of the object, causes the problems of complicated techniques, high cost and unachievable installation on a to-be-measured object can be solved by adopting the above method of the invention. The method comprises the steps of constructing an ideal camera noise model for a digital camera to take photos, calculating the vibration frequency of each pixel in the video according to the ideal camera noise model, and obtaining the vibration frequency of a to-be-measured object. According to the technical scheme of the invention, the defects of the conventional v contact type object vibration frequency measurement method are overcome. Meanwhile, the defect that the existing machine vision-based non-contact type object vibration frequency measurement method is limited by constraint conditions is also overcome. The above method is applied to off-line video data and online video data. Moreover, the method is simple in equipment, low in cost, good in adaptability and wide in application range.

Description

technical field [0001] The invention relates to the technical field of video data processing, in particular to a method for measuring the vibration frequency of a non-contact object based on video data mining. Background technique [0002] It is of great significance to measure the vibration frequency of objects, and it has wide application value in various fields of building health monitoring, geological disaster prevention monitoring, and industrial and agricultural production and scientific research. [0003] The current method of measuring the vibration frequency of an object mainly adopts the method of installing a contact vibration sensor on the object. Although this method has good accuracy in theory, there are still some problems. First of all, the installation of contact sensors on large objects to be measured (such as bridges) is not only complicated in technology and high in cost, but also requires regular maintenance and updating of the measurement system, and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00
CPCG01H17/00
Inventor 张睿童玉娟
Owner 上海航数智能科技有限公司
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