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Gray enhanced chromatography PIV reconstruction method, device and equipment

A grayscale enhancement, grayscale technology, applied in image data processing, instrumentation, 2D image generation, etc., can solve problems such as incorrectness and slow update speed

Active Publication Date: 2015-06-03
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.

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  • Gray enhanced chromatography PIV reconstruction method, device and equipment
  • Gray enhanced chromatography PIV reconstruction method, device and equipment
  • Gray enhanced chromatography 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 gray enhanced chromatography PIV (Particle Image Velocimetry) reconstruction method. The method comprises the following steps: before MART (Multiplication Algebraic Reconstruction Technology) iteration, counting a particle drawing ratio in a space gray field; according to the particle drawing ratio, determining an inverted diffusion intensity factor, and updating the space gray field according to the inverted diffusion intensity factor and an inverted diffusion equation; calculating a gray inhibiting factor according to a particle concentration obtained by counting, then reallocating the particle gray to the updated space gray field according to the gray inhibiting factor, and then performing the MART iteration for the next time. The invention further 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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IPC IPC(8): G06T11/00
Inventor 高琪王洪平王晋军魏润杰
Owner BEIHANG UNIV
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