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Dual-view angle multiple bubble corresponding point matching method based on multi-dimensional threshold value constraint

A dual-view, multi-bubble technology, applied to measuring devices, material analysis through optical means, instruments, etc., can solve problems such as incomplete adaptation of bubbles

Active Publication Date: 2012-08-01
TIANJIN UNIV
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Problems solved by technology

For the dual-view bubble images collected by high-speed cameras, the centroids of multiple bubbles can be used as matching feature points for matching. Not fully adapted

Method used

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  • Dual-view angle multiple bubble corresponding point matching method based on multi-dimensional threshold value constraint
  • Dual-view angle multiple bubble corresponding point matching method based on multi-dimensional threshold value constraint
  • Dual-view angle multiple bubble corresponding point matching method based on multi-dimensional threshold value constraint

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Embodiment Construction

[0018] This method is suitable for dual-view and multi-bubble matching of the same name in a gas-liquid two-phase flow characteristic parameter three-dimensional measurement platform composed of a single high-speed camera and a refractive beam splitting optical path. It is also suitable for dual-views in a three-dimensional measurement platform composed of two high-speed cameras Multiple bubbles of the same name match.

[0019] For the selection of matching primitives, on the basis of obtaining the original picture of the dual-view bubble, using digital image processing technology, through the regional features of the bubble’s projection area, the bubble’s centroid point coordinates are extracted and used as the matching point feature, namely Point-like primitives. At the same time, consider that the centroid ordinates of multiple "bubble pairs" in the left and right frames of the dual-view image are approximately equal, and the projection heights on the vertical plane are approx...

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Abstract

The present invention relates to fluid bubble measurement and image processing. To meet accurate corresponding point matching of dual-view angle multiple bubbles of a left image and a right image in a three-dimensional measurement system of gas-liquid two-phase flow characteristic parameters, the technical scheme of the present invention is that, the dual-view angle multiple bubble corresponding point matching method based on the multi-dimensional threshold value constraint comprises the following steps: (1) adopting a digital image processing technology to acquire center-of-mass coordinates and projection heights of the multiple bubbles in an image requiring matching, determining ordinate difference of the air bubble pair, and performing the next determination; (2) adopting the projection compatibility constraint of the bubbles in the dual-view angle image to perform further determination on a candidate primitive; (3) adopting the matched primitive with a nearest geometric distance to an epipolar line as a candidate primitive; and (4) carrying out reverse epipolar line calculation on the screened matched point, and then calculating based on the multi-dimensional threshold value constraint to finally achieve the corresponding point matching. The method of the present invention is mainly applicable for fluid bubble measurement.

Description

Technical field [0001] The invention relates to fluid bubble measurement and image processing, in particular to a dual-view and multi-bubble same-name matching method based on multi-dimensional threshold constraints. Background technique [0002] In the fields of petroleum, chemical industry, metallurgy, pharmacy, nuclear energy and other fields, the shape of bubbles in gas-liquid two-phase flow and the interaction between the dispersed phase and the continuous phase greatly affect the effect of engineering applications. In order to further study the internal mechanism of gas-liquid two-phase flow and describe the interaction relationship between bubbles more accurately, three-dimensional measurement of key characteristic parameters of bubbles in gas-liquid two-phase flow, such as three-dimensional trajectory, velocity field, etc. is needed. The prerequisite for three-dimensional measurement and reconstruction is to establish the corresponding relationship of the primitives (in t...

Claims

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Application Information

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IPC IPC(8): G01N21/84
Inventor 薛婷金俞鑫曹兆峰
Owner TIANJIN UNIV
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