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Damodaran, M. (author), Amelink, A. (author), de Boer, J.F. (author)Retinal blood vessel oxygenation is considered to be an important marker for numerous eye diseases. Oxygenation is typically assessed by imaging the retinal vessels at different wavelengths using multispectral imaging techniques, where the choice of wavelengths will affect the achievable measurement accuracy. Here, we present a detailed analysis...article 2018
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Toet, A. (author), de Jong, M.J. (author), Hogervorst, M.A. (author), Hooge, I.T.C. (author)We recently presented a color transform that produces fused nighttime imagery with a realistic color appearance (Hogervorst & Toet, 2010, Information Fusion, 11-2, 69-77). To assess the practical value of this transform we performed two experiments in which we compared human scene recognition for monochrome intensified (II) and longwave infrared...conference paper 2014
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- Dekker, R.J. (author), Bouma, H. (author), den Breejen, E. (author), van den Broek, A.C. (author), Hanckmann, P. (author), Hogervorst, M.A. (author), Mohamoud, A.A. (author), Schoemaker, R.M. (author), Sijs, J. (author), Tan, R.G. (author), Toet, A. (author), Smith, A.J.E. (author) conference paper 2013
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de Jong, A.N. (author), van Eijk, A.M.J. (author), Cohen, L.H. (author), Fritz, P.J. (author), Gunter, W.H. (author), Vrahimisb, G. (author), Faith, J. (author)The FATMOSE trial (False Bay Atmospheric Experiment) is a continuation of the cooperative work between TNO and IMT on atmospheric propagation and point target detection and identification in a maritime environment (South Africa). The atmospheric transmission, being of major importance for target detection, was measured with the MSRT multiband...conference paper 2011
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Dekker, R.J. (author), Kuenzer, C. (author), Lehner, M. (author), Reinartz, P. (author), Niemeyer, I. (author), Nussbaum, S. (author), Lacroix, V. (author), Sequeira, V. (author), Stringa, E. (author), Schöpfer, E. (author), TNO Defensie en Veiligheid (author)In this chapter a wide range of change detection tools is addressed. They are grouped into methods suitable for optical and multispectral data, synthetic aperture radar (SAR) images, and 3D data. Optical and multispectral methods include unsupervised approaches, supervised and knowledge-based approaches, pixel-based and object-oriented...bookPart 2009
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TNO Defensie en Veiligheid (author), Schwering, P.B.W. (author), Bekman, H.H.P.T. (author), van Seijen, H.H. (author)Band selection is essential in the design of multispectral sensor systems. This paper describes the TNO hyperspectral band selection tool HYBASE. It calculates the optimum band positions given the number of bands and the width of the spectral bands. HYBASE is used to assess the minimum number of spectral bands that is required to get the best...conference paper 2009
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Wieringa, F.P. (author), Mastik, F. (author), ten Cate, F.J. (author), Neumann, H.A.M. (author), van der Steen, A.F.W. (author), TNO Kwaliteit van Leven (author)We describe a contactless optical technique selectively enhancing superficial blood vessels below variously pigmented intact human skin by combining images in different spectral bands. Two CMOS-cameras, with apochromatic lenses and dual-band LED-arrays, simultaneously streamed Left (L) and Right (R) image data to a dual-processor PC. Both...article 2006
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Wieringa, F.P. (author), Mastik, F. (author), van der Steen, A.F.W. (author), TNO Kwaliteit van Leven (author)We describe a route toward contactless imaging of arterial oxygen saturation (SpO2) distribution within tissue, based upon detection of a two-dimensional matrix of spatially resolved optical plethysmographic signals at different wavelengths. As a first step toward SpO 2-imaging we built a monochrome CMOS-camera with apochromatic lens and 3λ-LED...article 2005
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Leijtens, J.A.P. (author), Court, A.J. (author), de Boom, K. (author), Technisch Physische Dienst TNO - TH (author)Due to lower mass, size and power demands and recognized increased reliability, microbolometer detectors seem to be well suited for small sattelite applications. Due to the improving technical performance, next generation instruments can use uncooled microbolometer arrays without significantly sacrificing performance. An example of this type of...conference paper 2004
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Leijtens, J.A.P. (author), Smorenburg, C. (author), Escudero, I. (author), Boslooper, E.C. (author), Visser, H. (author), van Helden, W.A. (author), Breussin, F.N. (author), Technisch Physische Dienst TNO - TH (author)Current Thermal infra red ( 7..14μm) multispectral imager instruments use cryogenically cooled Mercury Cadmium Telluride (MCT or HgCdTe) detectors. This causes the instruments to be bulky, power hungry and expensive. For systems that have medium NETD (Noise Equivalent Temperature Difference) requirements and can operate with high speed optics (...conference paper 2004
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Leijtens, J.A.P. (author), Court, A.J. (author), Hoegee, J. (author), Technisch Physische Dienst TNO - TH (author)Current Thermal Infra Red (7.14μm) multispectral imager instruments use cryogenically cooled Mercury Cadmium Telluride (MCT or HgCdTe) detectors. Now due to the increased performance of uncooled microbolometer arrays, the next generation of instruments can be designed without cryogenic cooling. TNO TPD has designed a spectrometer called the...conference paper 2004