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Multi-grid processing method in particle image velocimetry (PIV)

A technology of particle image velocity measurement and processing method, which is applied in the field of image processing and can solve the problem of no major breakthrough in numerical methods and methods.

Inactive Publication Date: 2010-01-20
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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Problems solved by technology

Although the calculation of optical flow has made great leaps in terms of calculation accuracy and reliability, its numerical methods and means have not made a major breakthrough.

Method used

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  • Multi-grid processing method in particle image velocimetry (PIV)
  • Multi-grid processing method in particle image velocimetry (PIV)
  • Multi-grid processing method in particle image velocimetry (PIV)

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Embodiment Construction

[0026] First, a particle image velocimetry method applicable to the multi-grid processing method of the embodiment of the present invention is introduced.

[0027] The key parts of a complete particle image velocimetry processing system are as follows: figure 1 As shown, it mainly includes a data acquisition module, an image preprocessing module, a motion vector field (optical flow field) calculation module and a subsequent data analysis module. The subsequent data analysis module includes a curl calculation module and a divergence calculation module. The motion vector field calculation module is the core module of the whole PIV system.

[0028] When calculating the 2-dimensional motion vector field, divergence and curl field, the calculation idea based on the optical flow motion equation is adopted, and the motion vector is calculated in the form of an overall function. In order to suppress the noise while maintaining the local structure information of the vector field, dive...

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Abstract

The invention discloses a multi-grid processing method in particle image velocimetry (PIV). The method comprises the following steps: setting a first network, obtaining an equations set under the first network (corresponding to a high-resolution image) corresponding to an equations set to be solved; iteratively solving the equations set and obtaining an equation error according to a practical solution; setting a second network with a size thicker than the first network; mapping a solving scale of the equations set under the first network to a solving scale of the equations set under the second network; iteratively solving a high-frequency calculation error under the second network; mapping the scale of the high-frequency calculation error under the second network to obtain a low-frequency calculation error under the first network; and updating the practical solution with the low-frequency calculation error under the first network. The method can greatly accelerate the PIV processing process and can not lower the processing reliability and the processing precision.

Description

technical field [0001] The invention relates to image processing, in particular to a multi-grid processing method used in particle image velocity measurement. Background technique [0002] The motion forms of images in nature vary greatly. Fluid motion is a typical non-rigid body motion. Particle Image Velocimitry (PIV for short) is a new type of non-contact measurement technology. Usually, PIV is to put tracer particles into the fluid, and under the irradiation of the laser sheet light, use a camera to capture the particle image moving with the fluid in the direction perpendicular to the sheet light, and then process, analyze and calculate the image, and finally get the cross-section of the flow field A measurement method of two-dimensional velocity field. As a full flow field, non-contact, non-disturbance, high-precision flow visualization method, PIV is suitable for the measurement of time-varying complex flow fields such as turbulent flow and unsteady flow. Today, PIV ...

Claims

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Application Information

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IPC IPC(8): G01P5/20G06F17/11
Inventor 卢宗庆廖庆敏
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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