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Minerals 2018, 8(3), 103; https://doi.org/10.3390/min8030103

Froth Image Acquisition and Enhancement on Optical Correction and Retinex Compensation

1
College of Information Engineering, Chang’an University, Xi’an 710064, China
2
Royal Institute of Technology, 11428 Stockholm, Sweden
3
College of Computer Science, Chengdu University, Chengdu 610106, China
4
Faculty of Information Technology and Equipment Engineering, Xi’an University of Tech, Xi’an 710082, China, [email protected]
*
Author to whom correspondence should be addressed.
Received: 17 December 2017 / Revised: 22 February 2018 / Accepted: 2 March 2018 / Published: 6 March 2018
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Abstract

To well monitor and optimize the flotation production, a computer vision and image analysis system is used. In such a system, the first important step is to acquire the froth surface images in high quality. Froth imaging quality is hard to control, and the industrial field noise, froth 3D properties, complex textures, and mixed colors can also cause the flotation image to be difficult to segment and process. To acquire high quality images, a new system for image acquisition of the lead flotation is studied. The system constructs the free-form surface lens based on the non-imaging optics theory, which can improve the optical efficiency of the lens and the uniformity of light sources, and can reduce flare effects. For the compensation, an improved MSR (Multi-Scale Retinex) adaptive image algorithm is proposed to increase the brightness and intensity contrast for small bubbles, and to enhance texture details and froth weak edges by analyzing the Retinex output characteristics of the shaded area and improving the gain function. Under the condition of the optimal parameters, the image acquisition system can obtain uniform illumination and reduce different noises. Experiments show that the new froth image acquisition system increases Signal/Noise by 14%, contrast by 21%, and image segmentation accuracy by 26% in an image. View Full-Text
Keywords: flotation; froth image; free-form surface lens; Multi-Scale Retinex flotation; froth image; free-form surface lens; Multi-Scale Retinex
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Wang, W.; Liu, W.; Lang, F.; Zhang, G.; Gao, T.; Cao, T.; Wang, F.; Liu, S. Froth Image Acquisition and Enhancement on Optical Correction and Retinex Compensation. Minerals 2018, 8, 103.

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