Color mixing in LED illuminating system for endoscopic purposes

Błaszczak, U. J.; Gryko, Łukasz; Palkowska, Anna; Kulesza, Ewa; Zając, Adam

doi:10.1109/lumenv.2016.7745522

Cited by 3 publications

(4 citation statements)

References 8 publications

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“…LEDs are powered using the pulse width modulation (PWM) technique. An analysis of colour rendering from the LED illuminators was presented in [16] to observe the inner surface of the body on the natural colour. The authors used 13 LEDs with different spectral characteristics and analyzed various quality mixing issues of LEDs' colours.…”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

Experimental Evaluation and Analysis of LED Illumination Source for Endoscopy Imaging

Mewada¹,

Patel²,

Chaudhari³

et al. 2022

IJIE

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The minimally invasive surgery uses a small instrument with camera and light to fit the tiny cut in the skin. The selection of the light depends on the power and driving current of the circuit. It can also help in the standardization of the camera and capture the tissues' true-colour image. This paper presents the LED source analysis used in the clinical endoscopes for surgery and thehuman body's medical examination. Initially, a LED source selection mechanism generating intense illuminance in a visibleband is proposed. A low-cost prototype model is developed to analyze the wavelength and illuminance of three different LEDs types. Aneffect on variation in LED illumination is investigated by changing the distance between the Borescope and LED source. True-colour image generation and tissue contrast are more important in medical diagnostics. Therefore, a sigmoid function improving the whole contrast ratio of the captured image in real-time is presented. The results of spectrum and wavelength for a current variation are presented. Type 3 LED produces higher illumination (i.e., 395 Klux) and peak wavelength (i.e., 622.05 nm) than other LEDs, while type-2 LED has better FWHM for the blue colour spectrum. The modification in the sigmoid function enhances the image with 34.25peak PSNR producing a true-colour image.

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Section: Materials and Experimental Methodsmentioning

confidence: 99%

Experimental Evaluation and Analysis of LED Illumination Source for Endoscopy Imaging

Mewada¹,

Patel²,

Chaudhari³

et al. 2022

IJIE

View full text Add to dashboard Cite

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“…2). Light from the set of LEDs is provided by 3 mm plastic optical fibres (POF) to a rectangular-shaped homogenizing rod (HR) (cross-section 20 mm × 19 mm, length L = 200 mm) [14,45,46]. At the output surface of the rod a diffuser (N-BK7 Ground Glass Diffuser, 120 Grit) is used, which improves the uniformity of light emitted from HR.…”

Section: Construction Of Sourcementioning

confidence: 99%

“…With this technique we control the spectral composition of light in each illuminating fibre and we can change these spectra depending on the requirements within an assumed range. As the coupling efficiency of each LED with an optical fibre providing light to the homogenizing rod can be different, we have performed measurements of total optical power at the output of each coupling fibre, which enabled to simulate the operation of the homogenizing rod [45,46], select the supply for each component for each assumed spectral distribution of the output white light beam (illuminant A -2856 K, 3500 K, 4500 K, D55 and D65) [45] and characterize its quality according to CIE colorimetric parameters [7,38]. SPDs of output white light for each CCT were measured at 6 distances from the output of the optical homogenizing rod -5, 10, 15, 20, 25, 30 mm (examples in Fig.…”

Section: Construction Of Sourcementioning

confidence: 99%

Metrology and Measurement Systems

Błaszczak¹,

Gryko²,

Zając³

2019

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In this paper we describe our own construction of a tuneable light source based on a set of light emitting diodes covering the visible spectrum using a homogenizing rod instead commonly used low energy-efficient integrating spheres. The expected prime application of the source is a medical endoscopic system, however it is possible to use it also for other purposes requiring both multispectral operation and a tuneable white light source. We describe the construction of the source and include precise characterization of the output white light -distribution of CCT, Duv, ∆u ′ v ′ and colour rendering indexes (R a , R 9 , R f , R g ) of light in several planes located at various distances. The obtained results prove that our source is characterized by very good colour rendition according to the R a and R f method for various correlated colour temperatures (2700-6500) K. As an example of application images of the Macbeth colour chart registered with an RGB camera included in the laboratory measurement stand are presented. The obtained results prove that, after whole system calibration, this source can be used in many applications, where evaluation of objects requires precise analysis of their colour and multispectral procedures.

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“…Moreover, a growing number of applications have emerged that require illumination with the spectra tailored to their individual needs, rather than ordinary white light. The light of a dedicated spectrum is often used in museums, horticulture, industry or healthcare [3][4][5][6]. Due to a large number of possible applications, the light source with a fixed spectral characteristic is not very effective.…”

mentioning

confidence: 99%

Comparison of modelling and measurement results of spectra emitted by a programmable lamp

Feldzensztajn

Mazikowski

2018

Photon.Lett.PL

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Nowadays artificial light with optimized spectrum is used in many different applications. For instance, it is widely used in museums and exhibitions to illuminate the art. Moreover, such light stimulates the growth of plants, or can be applied in industry and healthcare. To achieve the best results for each application, adjusting of dedicated spectrum is required, that is a complicated task. The ongoing research is focused on simplifying this process. In this paper we present the developed lamp with programmable spectrum, and its user interface. Predicted and measured output spectra are investigated. Full Text: PDF ReferencesMottier, P., LEDs for Lighting Applications, Willey (2009) CrossRef Pimputkar, S., Speck, J.S., DenBaars, S.P., Nakamura, S., "Prospects for LED lighting", Nature photonics 3 (4), 180 (2009) CrossRef Knulst, A. J., Mooijweer, R., Jansen, F. W., Stassen, L. P., and Dankelman, J., "Indicating shortcomings in surgical lighting systems," Minim. Invasive Ther. Allied Technol. 20 (5), 267–275 (2011) CrossRef Blaszczak, U., Gryko, L., Palkowska, A., Kulesza, E., Zajac, A., "Color mixing in LED illuminating system for endoscopic purposes", Lighting Conference of the Visegrad Countries (Lumen), IEEE (17 November 2016) CrossRef Nanya, K., Ishigami, Y., Hikosaka, S., Goto, E., "Effects of blue and red light on stem elongation and flowering of tomato seedlings", Acta Hortic. 956, pp. 264–266 (2012). CrossRef Cegielski, T. , Bujalski, D. , Kowalczyk, K. , Gajc-Wolska, J. , Hemka, L., "Use of light emission programming in tomato grow light system", Proceedings of Electrotechnical Institute 63 (273), 79-94 (2016) CrossRef Mazikowski, A., Feldzensztajn, M., "Lamp of adjustable spectrum for photographic usage", Proc. SPIE 10445, Photonics Applications in Astronomy, Communications, Industry, and High Energy Physics Experiments, 104450K (2017) CrossRef CREE Inc, Cree® XLamp® XT-E LEDs Product family data sheet (accessed 16 April 2018). DirectLink Dyble, M., Narendran, N., Bierman, A., Klein, T., "Impact of dimming white LEDs: chromaticity shifts due to different dimming methods", Optics and Photonics 2005, San Diego, California, United States DirectLink

show abstract

Color mixing in LED illuminating system for endoscopic purposes

Cited by 3 publications

References 8 publications

Experimental Evaluation and Analysis of LED Illumination Source for Endoscopy Imaging

Experimental Evaluation and Analysis of LED Illumination Source for Endoscopy Imaging

Metrology and Measurement Systems

Comparison of modelling and measurement results of spectra emitted by a programmable lamp

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