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A method for suppressing speed resolving noise in an optical speed and mileage measuring instrument

A measuring instrument and speed technology, applied in color TV parts, TV system parts, TV and other directions, can solve problems such as large noise, reduce speed and mileage measurement accuracy, error, etc., to suppress solution noise, improve The effect of high measurement accuracy and reliability

Active Publication Date: 2019-05-03
江西省智成测控技术研究所有限责任公司
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Problems solved by technology

The complex actual working environment will lead to errors in the calculation of the speed of the optical speed and mileage measuring instrument based on the spatial filtering technology, which will reduce the measurement accuracy of the speed and mileage
For example, in vehicle-mounted applications, on the one hand, the undulations of the road surface and the ups and downs of the vehicle may cause the distance between the measured road surface and the optical speed and mileage measuring instrument to change beyond the measurement depth of field, resulting in the road surface not being clearly imaged in the spatial filter. on the filter; on the other hand, some roads have a large absorption of light intensity so that the image brightness on the spatial filter is very low
In addition, some sudden changes in the road surface may introduce large noise, making its intensity greater than that of the effective signal
These reasons are likely to cause the frequency information output by the speedometer to not correctly reflect the speed information of the vehicle

Method used

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  • A method for suppressing speed resolving noise in an optical speed and mileage measuring instrument
  • A method for suppressing speed resolving noise in an optical speed and mileage measuring instrument
  • A method for suppressing speed resolving noise in an optical speed and mileage measuring instrument

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Embodiment Construction

[0043] The present invention will be described in further detail below in conjunction with the embodiments and with reference to the accompanying drawings.

[0044] A method for suppressing speed calculation noise in an optical speed and mileage measuring instrument, the specific steps are as follows:

[0045] Step 1: Under the control of the central processing unit, the optical speed and mileage measuring instrument reads a row of pixel data of the image sensor, which is recorded as the i-th row of pixel data;

[0046] Step 2: Calculate the differential value of the pixel data of the image sensor: For the i (i=0,1,...,N-1) line of image data, add up the gray values ​​of the first W pixels and record it as A i,0 , accumulate the gray values ​​of the next W pixels, denoted as C i,0 ; Then add up the gray values ​​of the next W pixels and record it as A i,1 , accumulate the gray values ​​of the next W pixels, denoted as C i.1 , ..., and so on, all the pixels of the i-th row a...

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Abstract

The invention discloses a method for suppressing speed resolving noise in an optical speed and mileage measuring instrument. The method is based on the characteristics of the power spectrum density ofa spatial filter. When the speed is calculated, the characteristics of the signal to noise ratio and the spectral line frequency variance of a power spectrum are combined, a logarithmic weighting algorithm is used for calculating the speed, meanwhile, a threshold value is set for the signal to noise ratio and the spectral line frequency variance respectively, and when the signal to noise ratio and the spectral line frequency variance meet the threshold value at the same time, it is judged that the calculation speed is effective. And by combining the median filtering technology and the linearmoving average technology, the resolving noise can be effectively suppressed, and the speed and the mileage measurement precision are improved.

Description

technical field [0001] The invention relates to the technical field of optical speed and mileage measuring instruments, in particular to a method for suppressing speed calculation noise in an optical speed and mileage measuring instrument. Background technique [0002] The requirements of modern measurement for high precision, no damage, and high efficiency determine the development of measurement technology from traditional contact measurement to non-contact measurement. In recent years, with the rapid development of photoelectric technology, spatial filtering velocimetry technology has been more and more widely used in many fields in industrial production and scientific research. It can be used for non-contact measurement of fluid, gas and solid surface velocity , has broad application prospects in both civilian and military fields. [0003] Although the image sensor-based spatial filtering technology has been proposed in the 1980s, it has not attracted widespread attenti...

Claims

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Application Information

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IPC IPC(8): H04N5/225H04N5/335H04N5/357
Inventor 贾晓东丁振华杜天旺熊桂超
Owner 江西省智成测控技术研究所有限责任公司
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