A gray-scale enhanced tomographic piv reconstruction method, device and equipment

A grayscale enhancement and grayscale technology, which is applied in image data processing, instrumentation, 2D image generation, etc., can solve the problems of slow update speed and incorrectness, reduce influence, increase grayscale contrast, and improve iteration effect Effect

Active Publication Date: 2017-11-10
BEIHANG UNIV +1
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Problems solved by technology

[0010] From the above analysis, it can be seen that the MART algorithm in the tomographic PIV method does not use many useful information such as particle shape and gray level, which leads to its own update speed is very slow, or even incorrect.

Method used

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  • A gray-scale enhanced tomographic piv reconstruction method, device and equipment
  • A gray-scale enhanced tomographic piv reconstruction method, device and equipment
  • A gray-scale enhanced tomographic piv reconstruction method, device and equipment

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Embodiment Construction

[0054] It is known from the prior art that for particle elongation, such as figure 2 As shown, the degree of particle elongation is directly related to the viewing angle of the camera, and the smaller the viewing angle, the greater the degree of elongation. Elongated particles increase the uncertainty in particle localization and velocity field calculations. Let β denote the total viewing angle of the camera, d τ Represents the particle image diameter, according to the formula d τz ≈d τ / tan(β / 2) can easily estimate the initial diameter of particle elongation, where z is the thickness direction of the reconstructed body, figure 2 is a schematic diagram of the formula. d τz / d τ The value of is not fixed, as the MART iterates, its value will gradually decrease, but it is always greater than 1 within a limited number of iterations, and even reached 2 in some experiments. In order to better describe the particle elongation, the gray level of a single particle needs to be...

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Abstract

The invention discloses a method for reconstructing particle image velocimetry (PIV) of gray-scale enhanced tomography. The particle elongation ratio determines the inverse diffusion intensity factor, and updates the spatial grayscale field according to the inverse diffusion intensity factor and the inverse diffusion equation; calculates the grayscale suppression factor based on the particle concentration obtained by statistics, and calculates the grayscale suppression factor according to the grayscale The suppression factor redistributes the particle gray levels of the updated spatial gray level field, and then performs the next MART iteration. The invention also discloses a device and equipment for realizing the method.

Description

technical field [0001] The present invention relates to a tomographic particle image velocimetry technology based on gray scale enhancement, in particular to a gray scale enhanced tomographic particle image velocimetry (Particle Image Velocimetry, PIV for short) reconstruction method, device and equipment. Background technique [0002] PIV is a modern laser velocity measurement technology, which is mainly used in flow field velocity measurement, and the velocity field is obtained by tracking the movement of tracer particles in the flow field. The recently emerging tomographic particle image velocimetry technology (tomographic PIV) has successfully extended the two-dimensional PIV to the three-dimensional flow field measurement, and can obtain the instantaneous three-dimensional three-component (3D3C) velocity field. This technology reconstructs the real distribution of space particles through particle scattering imaging under different viewing angles (generally 4 cameras), a...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T11/00
Inventor 高琪王洪平王晋军魏润杰
Owner BEIHANG UNIV
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