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Fast fluorescent imaging-based Thai jasmine rice identification with polynomial fitting function and neural network analysis
(2014-04-01)
Suwansukho, Kajpanya
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Sumriddetchkajorn, Sarun
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Buranasiri, Prathan
With our single-wavelength spectral-imaging-based Thai jasmine rice identification system, we emphasize here that a combination of an appropriate polynomial fitting function on the determined chain code and a well-trained neural network configuration is highly sufficient in achieving a low false acceptance rate (FAR) and a low false rejection rate (FRR). Experimental demonstration shows promising results in identifying our desired Thai jasmine rice from six unwanted rice varieties with FAR and FRR values of 6.2% and 7.1%, respectively. Additional key performances include a much faster identification time of 30.5 s, chemical-free analysis, robustness, and adaptive learning.
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Simple microfluidic chip structure for an alignment-free Young interferometry-based refractometer
(2013-12-07)
Chaitavon, Kosom
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Sumriddetchkajorn, Sarun
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Nukeaw, Jiti
We propose a two-flow-channel microfluidic chip for use in a Young interferometry-based refractometer structure. Specifically, this work embeds the optical mask inside the microfluidic chip, thus completely eliminating precise free-space optical alignment between the optical mask and the microfluidic chip. The key idea is accomplished by permanently making the area surrounding the two flow channels opaque. Once the incoming optical beam passes through the two flow channels, it is automatically divided into two optical beams that will interfere with each other at the two-dimensional detection plane. Experimental proof of concept via a laboratory prototype having a two-flow-channel microfluidic chip with a channel spacing and depth ratio of 3, a 635 nm wavelength laser diode, and a 1600 × 1200-pixel image sensor shows a measured 4.28 × 10-5 RIU per pixel sensitivity with a measured resolution of 8.11 × 10-6 RIU. Other key features include simplicity, ease of implementation, and disposability. © 2013 The Royal Society of Chemistry.
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Single-wavelength based thai jasmine rice identification with polynomial fitting function and neural network analysis
(2013-09-18)
Suwansukho, Kajpanya
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Sumriddetchkajorn, Sarun
;
Buranasiri, Prathan
We previously showed that a combination of image thresholding, chain coding, elliptic Fourier descriptors, and artificial neural network analysis provided a low false acceptance rate (FAR) and a false rejection rate (FRR) of 11.0% and 19.0%, respectively, in identify Thai jasmine rice from three unwanted rice varieties. In this work, we highlight that only a polynomial function fitting on the determined chain code and the neural network analysis are highly sufficient in obtaining a very low FAR of < 3.0% and a very low 0.3% FRR for the separation of Thai jasmine rice from Chainat 1 (CNT1), Prathumtani 1 (PTT1), and Hom-Pitsanulok (HPSL) rice varieties. With this proposed approach, the analytical time is tremendously suppressed from 4,250 seconds down to 2 seconds, implying extremely high potential in practical deployment. © 2013 SPIE.
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Improved tunable filter-based multispectral imaging system for detection of blood stains on construction material substrates
(2013-09-18)
Janchaysang, Suwatwong
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Sumriddetchkajorn, Sarun
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Buranasiri, Prathan
We present the improved tunable filter based multispectral imaging system for detecting blood stains on construction materials. Based upon the reflectance and Kubelka Munk absorbance spectra stocked from our previous work, we modify the blood discrimination criteria to make the system more efficient by replacing the old criteria which make use of polynomial fitting with new criteria associated with a few wavelengths images. The newly established criteria are tested to be able to detect blood against other stains almost as efficient as the old criteria, while the number of spectral images required for detecting blood stains are reduced significantly from 64 to 9 spectral images. The reduction of required spectral images will reduce the time needed for image capturing and blood detection criteria application with little sacrificing of the specificity and sensitivity of the system. © 2013 SPIE.
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Message from the conference chairs
(2013-09-18)
Buranasiri, Prathan
;
Sumriddetchkajorn, Sarun
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Tunable filter-based multispectral imaging for detection of blood stains on construction material substrates part 2: Realization of rapid blood stain detection
(2013-07-10)
Janchaysang, Suwatwong
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Sumriddetchkajorn, Sarun
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Buranasiri, Prathan
Based on the blood stain detection method and criteria established in part 1 of this article, we combine and organize all necessary tasks to realize the multispectral imaging-based rapid blood stain detection system. To rapidly detect blood stains on the test surface, the developed system automatically captures the spectral images, extracts their spectral data, determines the positions of blood stains, and accurately highlights the positions of blood stains on the display. To achieve such a system, several tasks are newly introduced, including adjustment of camera exposure times to prevent image saturation or excessive darkness, the search for the sampled clean positions of the substrate to determine the substrate reflectance spectrum, and suitable detection procedures and proper arrangement of criteria to eliminate unnecessary calculations. Parallel processes between image capturing and blood stain identification help shorten the time for blood stain identifications despite a large amount of spectral data to be processed. The developed system can identify blood against several other reddish brown stains on several substrates. The measured average identification times on different test surfaces range from only 23.3 to 28.7 s, including the image capturing process. © 2013 Optical Society of America.
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Highly sensitive refractive index measurement with a sandwiched single-flow-channel microfluidic chip
(2013-05-21)
Chaitavon, Kosom
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Sumriddetchkajorn, Sarun
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Nukeaw, Jiti
We propose a simple single-flow-channel microfluidic chip that can be used in an interferometry-based refractometer for the realization of highly sensitive refractive index analysis. The key idea relies on sandwiching two single-flow-channel microfluidic chips in such a way that their flow channels are laterally shifted with respect to each other, forming two flow channels for use in our Young's interferometric-based refractometer. Experimental demonstrations on our laboratory prototype, comprised of two large 1 mm deep single-flow-channel microfluidic chips with a 400 μm lateral shift between the two flow channels, a 635 nm wavelength laser diode, and a 1600 × 1200 pixel image sensor, show a very high measured sensitivity of 5.62 × 10-6 RIU/pixel with a measured resolution of 9.67 × 10 -7 RIU when used to determine the refractive indices of phosphate buffered saline solutions. Additional key features include a low component count, high compactness, and ease of implementation. © 2013 The Royal Society of Chemistry.
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Built-in-mask microfluidic chip for highly-sensitive Young interferometry-based refractometer structure
(2012-12-01)
Chaitavon, Kosom
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Sumriddetchkajorn, Sarun
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Nukeaw, Jiti
In this article, we propose a built-in-mask two-flow-channel microfluidic chip for use in our highly-sensitive Young interferometry-based refractometer structure. Our key idea is to make the area surrounding the two flow channels opaque by using a black material (e.g., black silicone). Once the incoming optical beam passes through the two flow channels, it is automatically divided into two optical beams that will interfere with each other at the two-dimensional detection plane, eliminating a highly precise alignment technique previously required between an external mask and the microfluidic chip. Experimental proof of concept using a two-flow-channel microfluidic chip with a channel spacing and depth ratio of 3, a 635-nm wavelength laser diode, and a 1600×1200-pixel image sensor shows a measured high 4.28×10-5 RIU/pixel sensitivity with a measured resolution of 8.11×10-6 RIU. © 2012 IEEE.
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Sandwiched microfluidic chip-based interferometric refractometer
(2012-12-01)
Sumriddetchkajorn, Sarun
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Chaitavon, Kosom
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Nukeaw, Jiti
We propose and experimentally show that a highly-sensitive optofluidics-based refractometer structure can be simply realized. Our key idea is based on the use of a very simple microfluidic chip structure that consists of only one flow channel. Specifically, we sandwich the two microfluidic chips in such a way that their flow channels are laterally shifted at a desired distance, forming two channels for use in our Young interferometric-based refractometer structure. Experimental demonstration using two large 1-mm-deep single-flow-channel microfluidic chips, a 635-nm wavelength laser diode, and a 1600×1200-pixel image sensor shows a measured very-high sensitivity of 5.62×10-6 RIU/pixel with a measured resolution of 9.23×10-7 RIU. © 2012 IEEE.
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Laser-based mosquito repelling module
(2012-12-01)
Boonsri, Chantira
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Sumriddetchkajorn, Sarun
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Buranasiri, Prathan
This article proposes and shows that a low-optical-power laser when arranged in a zigzag fashion in a free space can create strong air thermal stress and form a chemical-free optical net that is capable of repelling adult mosquitoes away. Experimental proof of concept using a pointer-like diode-pump solid-state laser (447 nm wavelength and 500 mW maximum) and reflective sheets shows that all 80 adult Aedes albopictus mosquitoes are completely trapped inside the open glass chamber. Most of the adult mosquitoes prefer to stay near the bottom of the open glass chamber as it is cooler than the top part that contains several zigzagging laser beams. Reducing air thermal stress via increasing the spacing between the two adjacent laser beams allows the adult mosquitoes to easily escape out of the zone of the laser beams. © 2012 IEEE.

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