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Minerals 2015, 5(2), 142-163; https://doi.org/10.3390/min5020142

Flotation Bubble Delineation Based on Harris Corner Detection and Local Gray Value Minima

1
School of Physics & Information Engineering, Fuzhou University, 350108 Fuzhou, China
2
Royal Institute of Technology, 100 44 Stockholm, Sweden
*
Author to whom correspondence should be addressed.
Academic Editor: Kota Hanumantha Rao
Received: 17 November 2014 / Revised: 12 December 2014 / Accepted: 5 January 2015 / Published: 30 March 2015
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Abstract

Froth image segmentation is an important and basic part in an online froth monitoring system in mineral processing. The fast and accurate bubble delineation in a froth image is significant for the subsequent froth surface characterization. This paper proposes a froth image segmentation method combining image classification and image segmentation. In the method, an improved Harris corner detection algorithm is applied to classify froth images first. Then, for each class, the images are segmented by automatically choosing the corresponding parameters for identifying bubble edge points through extracting the local gray value minima. Finally, on the basis of the edge points, the bubbles are delineated by using a number of post-processing functions. Compared with the widely used Watershed algorithm and others for a number of lead zinc froth images in a flotation plant, the new method (algorithm) can alleviate the over-segmentation problem effectively. The experimental results show that the new method can produce good bubble delineation results automatically. In addition, its processing speed can also meet the online measurement requirements. View Full-Text
Keywords: froth image; bubble delineation; classification; segmentation; gray value minima; Harris corner froth image; bubble delineation; classification; segmentation; gray value minima; Harris corner
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Wang, W.; Chen, L. Flotation Bubble Delineation Based on Harris Corner Detection and Local Gray Value Minima. Minerals 2015, 5, 142-163.

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