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Speed measurement optimization method in space filtering speed measurement technology

A technology of spatial filtering and speed measurement, which is applied in the field of speed measurement technology, can solve problems such as the influence of speed measurement accuracy, and achieve the effects of good accuracy, easy extraction, and easy peak extraction

Active Publication Date: 2019-09-06
UNIV OF SHANGHAI FOR SCI & TECH
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  • Application Information

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Problems solved by technology

[0004] The present invention aims at the problem that the speed measurement accuracy is affected in complex environments, and proposes a speed measurement optimization method in the space filter speed measurement technology, based on the existing space filter speed measurement algorithm, through the preprocessing of the sampled pictures and spectrum estimation Algorithm optimization for more accurate speed

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  • Speed measurement optimization method in space filtering speed measurement technology

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Embodiment Construction

[0046] A speed measurement optimization method in a space filter speed measurement technology, comprising the following steps:

[0047] Step 1: Under the illumination of a certain brightness of LED white light, set the acquisition frame rate of the area array CMOS camera to 1000fps, and the image mode is gray scale acquisition. The picture is transmitted to the computer for processing, and the collected picture sample;

[0048] Step 2, the collected image can be divided into blocks according to the user's resolution requirements, select the sub-region to be tested, perform minimum value filtering on it, and then use the maximum inter-class variance method to perform image binarization processing;

[0049] Minimum value filtering is an image processing method. First, sort the gray value of the surrounding pixels and the gray value of the central pixel, and then compare the gray value of the central pixel with the minimum gray value. If it is smaller than the minimum gray value,...

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Abstract

The invention relates to a velocity measurement optimization method in a spatial filtering velocity measurement technology, which is used for enhancing the contrast ratio and facilitating the extraction of feature points through image preprocessing, thereby well improving the measurement of a low-speed moving object in a complex environment. Through differential operation, the influence caused bypart of background noise is eliminated; a proper grid spacing is obtained according to the sizes of the feature points, so that power spectrum peak extraction can be facilitated; a Welch method is used to obtain power spectrum estimation with good smoothness and good precision, and peak value extraction is facilitated. On the basis of an existing spatial filtering velocity measurement algorithm, more accurate velocity is obtained through preprocessing of a sampling picture and optimization of a spectrum estimation algorithm.

Description

technical field [0001] The invention relates to a speed measurement technology, in particular to a speed measurement optimization method in the space filtering speed measurement technology. Background technique [0002] Spatial Filtering Velocimetry (SFV) technology has attracted more and more attention due to its advantages of simple and stable optical and mechanical structure and optional light source. When performing spatial filtering speed measurement, typical spatial filtering devices used include rectangular spatial filters, circular spatial filters, and Gaussian weighted spatial filters, etc. Rectangular filters are easier to implement in practical applications, so they are the most commonly used. [0003] The rectangular spatial filter can be simulated by the area array CMOS camera, and the speed result can be obtained by analyzing and processing the captured pictures. Such as: "Non-contact Measuring Device and Measuring Method for Surface Velocity Field Distributio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06T5/00G06T7/11
CPCG06T7/11G06F2218/10G06T5/70Y02T10/40
Inventor 杨晖强振东
Owner UNIV OF SHANGHAI FOR SCI & TECH