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. 2017 Jun 21;17(6):1459. doi: 10.3390/s17061459

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© 2017 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Growth measurement results comparison of the proposed LED array marker and printed striped pattern marker of the previous research in various visibility conditions. Red/green square box indicates the ROI (marked with the letter ROI) and the FFT pattern calculated from the ROI (marked with the number). The written number next to the spectrum indicates nonzero pixel size (FFT count). Results of before incubation (0 h) and after the incubation (4 h) were compared at conditions with (a) stripe pattern marker with the LB broth, (b) stripe pattern marker with the TSB broth, (c) LED marker with the LB broth, (d) LED marker with the TSB broth, and (e) LED marker with the TSB broth without the lightings.