Particle sizing from defocus image of spherical particles by image transition region gradient method

doi:10.3969/j.issn.0438-1157.2012.12.014

CIESC Journal ›› 2012, Vol. 63 ›› Issue (12): 3832-3838.DOI: 10.3969/j.issn.0438-1157.2012.12.014

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Particle sizing from defocus image of spherical particles by image transition region gradient method

CHENG Linhu, CAI Xiaoshu, ZHOU Wu

Institute of Particle and Two-phase Flow Measurement, University of Shanghai for Science and Technology, Shanghai 200093, China

Received:2012-05-15 Revised:2012-07-24 Online:2012-08-17 Published:2012-12-05
Supported by:
supported by the National Natural Science Foundation of China(50836003)and the Science and Technology of Admission of Shanghai Municipality(10540501000).

基于颗粒离焦模糊影像梯度算法的颗粒粒径测量方法

成林虎, 蔡小舒, 周骛

上海理工大学颗粒与两相流测量研究所, 上海 200093

通讯作者: 蔡小舒
作者简介:成林虎(1986-),男,硕士研究生。
基金资助:
国家自然科学基金重点项目(50836003);上海市科委科技支撑计划-部分地方院校能力建设项目(10540501000)。

Abstract

Abstract: Particles exist in many areas,their characterization measurement and monitoring are of great importance.With the development of technology,digital image processing technique as a direct-viewing and non-contact measurement method has been widely used.However,in the optical imaging system,the depth of field is limited.In order to increase the measurement range,the defocus images should be processed. Defocus image of spherical particles were studied from simulation and experiment. It was proven that the gradient of image transition area and the defocus distance were related,and the difference of two maximum gradients along the radial direction was the particle diameter in image.

Key words: particle measurement, image method, restoration method, gradient

摘要： 颗粒存在于诸多领域中,对它们表征的测量和监测有着重要意义。数字影像测量技术是一种直观、非接触的测量方法,随着技术的发展得到了广泛的应用。然而在光学成像系统中,景深是有限的,如能对离焦模糊影像进行处理,就可以获得更大的测量区域。分别从仿真和实验两方面研究了球形颗粒离焦模糊影像的性质,证明了在一定离焦量范围,可以从模糊影像过渡区域中直径方向上两个最大梯度值得到颗粒的粒径。

关键词: 颗粒测量, 影像法, 复原方法, 影像梯度

CLC Number:

CHENG Linhu, CAI Xiaoshu, ZHOU Wu. Particle sizing from defocus image of spherical particles by image transition region gradient method[J]. CIESC Journal, 2012, 63(12): 3832-3838.

成林虎, 蔡小舒, 周骛. 基于颗粒离焦模糊影像梯度算法的颗粒粒径测量方法[J]. 化工学报, 2012, 63(12): 3832-3838.

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Particle sizing from defocus image of spherical particles by image transition region gradient method

基于颗粒离焦模糊影像梯度算法的颗粒粒径测量方法

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