Two-phase flow pattern feature extraction method

A feature extraction and phase flow technology, which is applied in the field of two-phase flow flow pattern feature extraction, can solve the problems of long target detection time and low detection accuracy, and achieve the effect of simple method, short running time and avoiding subjectivity

Pending Publication Date: 2019-06-07
YUNNAN AGRICULTURAL UNIVERSITY +1
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Based on these image feature extraction algorithms, there are some defects in solvi

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  • Two-phase flow pattern feature extraction method
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  • Two-phase flow pattern feature extraction method

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[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in combination with the embodiments of the present invention and the accompanying drawings. Apparently, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0023] As shown, the embodiment of the present invention uses direct contact heat exchanger images. Using organic working fluid and heat transfer oil to conduct heat transfer experiments, RGB color images of bubbles are generated under high heat flow ( figure 1 ) and extract bubble eigenvalues. Specifically, it includes two parts: first, SVM is used to initially segment the gas-liquid image, and then grayscale inversion, high-hat transformat...

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Abstract

The invention discloses a two-phase flow pattern feature extraction method. The invention belongs to the field of flow pattern recognition in metallurgy and chemical engineering. the method comprisesthe following steps: firstly, by adopting an existing visualization technology, for example, acquiring a two-phase flow mixed color image by a high-speed camera; preprocessing a color image by utilizing top hat transformation and image filtering in existing software matlab; after preprocessing, extracting RGBvalues of a representative target and a representative background respectively by adoptingthe existing Colorpix software; adopting a support vector machine (SVM) algorithm to segment a target and a background in a two-phase flow image, extracting the target or the background, and finallyrealizing target image recognition through an rgb2gram function in Matlab software and binarization threshold processing, so that two-phase flow distribution is reflected more directly. According to the method, the space-time distribution diagram of the two-phase flow can be obtained more directly. The flow pattern feature extraction method is simple and short in operation time, the image recognition precision is improved, and the subjectivity of selection of an existing threshold method is also avoided.

Description

technical field [0001] The invention belongs to the field of flow pattern identification in the field of metallurgy and chemical industry, and more specifically relates to a method for extracting flow pattern features of two-phase flow. Background technique [0002] With the rapid development of multimedia technology and computer networks, digital images have also developed on a large scale. In the face of disorderly distributed images, the traditional technology can no longer meet the needs of users. The difficulty of target detection based on static pictures is that the target in the picture will change due to changes in illumination, viewing angle and target interior. Aiming at the task and difficulty of target detection, scholars at home and abroad have made many attempts. Based on these image feature extraction algorithms, there are some defects in solving static pictures: low detection accuracy; target detection time is too long, etc. [0003] Two-phase flow widely ...

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Application Information

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IPC IPC(8): G06K9/46G06K9/34G06K9/62
Inventor 黄峻伟徐建新郭雅欣肖清泰王华
Owner YUNNAN AGRICULTURAL UNIVERSITY
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