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Shih, K.-T.; Liu, J.-S.; Shyu, F.; Yeh, S.-L.; Chen, H.H. |
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Title |
Blocking harmful blue light while preserving image color appearance |
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Journal Article |
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Year |
2016 |
Publication |
ACM Transactions on Graphics |
Abbreviated Journal |
Tog |
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Volume |
35 |
Issue |
6 |
Pages  |
1-10 |
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Keywords |
Lighting; Vision |
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Abstract |
Recent study in vision science has shown that blue light in a certain frequency band affects human circadian rhythm and impairs our health. Although applying a light blocker to an image display can block the harmful blue light, it inevitably makes an image look like an aged photo. In this paper, we show that it is possible to reduce harmful blue light while preserving the blue appearance of an image. Moreover, we optimize the spectral transmittance profile of blue light blocker based on psychophysical data and develop a color compensation algorithm to minimize color distortion. A prototype using notch filters is built as a proof of concept. |
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0730-0301 |
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LoNNe @ kyba @ |
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1640 |
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Author |
Plummer, K.E.; Hale, J.D.; O'Callaghan, M.J.; Sadler, J.P.; Siriwardena, G.M. |
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Title |
Investigating the impact of street lighting changes on garden moth communities |
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Journal Article |
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Year |
2016 |
Publication |
Journal of Urban Ecology |
Abbreviated Journal |
J Urban Ecol |
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2 |
Issue |
1 |
Pages |
juw004 |
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Keywords |
Animals |
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Night time illumination of cities is undergoing radical change through the adoption of new street lighting technologies, but the impacts of these large-scale changes on biodiversity have not been explored. Moths are of particular concern because of their nocturnal ‘flight-to-light’ responses. Here we examine in situ effects of (1) street lamp replacement and (2) the spatial distribution of local street lighting on garden moth communities in Birmingham, UK, to determine whether current shifts in street lighting infrastructure are leading to an increased attraction of moths into suburban areas. Using a unique before-after-control-impact survey, we show that switching from narrow (low-pressure sodium) to broad spectrum (high-pressure sodium) lamps significantly increases the diversity of macro-moths in suburban gardens. Furthermore, we demonstrate the complex ways in which the moth community differentially responds to variation in street lighting characteristics. In particular we found that macro-moth attraction was greatest at high lamp densities, whilst micro-moth families responded more strongly to street lamp proximity and the density of UV-emitting lamps specifically. Our findings indicate that moths are attracted to suburban gardens with closer, more dense and more spectrally diverse local street lighting, and suggest that suburban areas could represent ecological traps for moth communities if they have insufficient resources to support moth survival and reproduction. Further research is now needed to determine whether street lighting is progressively damaging moth communities, and to understand whether these impacts could be mitigated through changes to street lighting regimes or through the provision of ecologically important habitats in urban landscapes. |
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2058-5543 |
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LoNNe @ kyba @ |
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1500 |
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Schroer, S.; Felsmann, K.; Hölker, F.; Mummert, S.; Monaghan, M.T.; Wurzbacher, C.; Premke, K. |
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Title |
The impact of outdoor lighting on ecosystem function – gaining information with a Citizen Science approach using a questionnaire |
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Conference Article |
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2016 |
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Austrian Citizen Science Conference |
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8-13 |
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citizen science; mapping |
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Frontiers |
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LoNNe @ schroer @ |
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1572 |
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Author |
Mills, S.; Miller, S. |
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Title |
VIIRS Day/Night Band--Correcting Striping and Nonuniformity over a Very Large Dynamic Range |
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Journal Article |
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Year |
2016 |
Publication |
Journal of Imaging |
Abbreviated Journal |
J. Imaging |
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Volume |
2 |
Issue |
1 |
Pages |
9 |
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Instrumentation |
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The Suomi National Polar-orbiting (NPP) Visible Infrared Imaging Radiometer Suite (VIIRS) Day-Night Band (DNB) measures visible and near-infrared light extending over seven orders of magnitude of dynamic range. This makes radiometric calibration difficult. We have observed that DNB imagery has striping, banding and other nonuniformities—day or night. We identified the causes as stray light, nonlinearity, detector crosstalk, hysteresis and mirror-side variation. We found that these affect both Earth-view and calibration signals. These present an obstacle to interpretation by users of DNB products. Because of the nonlinearity we chose the histogram matching destriping technique which we found is successful for daytime, twilight and nighttime scenes. Because of the very large dynamic range of the DNB, we needed to add special processes to the histogram matching to destripe all scenes, especially imagery in the twilight regions where scene illumination changes rapidly over short distances. We show that destriping aids image analysts, and makes it possible for advanced automated cloud typing algorithms. Manual or automatic identification of other features, including polar ice and gravity waves in the upper atmosphere are also discussed. In consideration of the large volume of data produced 24 h a day by the VIIRS DNB, we present methods for reducing processing time. |
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2313-433X |
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LoNNe @ kyba @ |
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1400 |
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Author |
Barentine, J.C. |
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Title |
Going for the Gold : Quantifying and Ranking Visual Night Sky Quality in International Dark Sky Places |
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Journal Article |
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Year |
2016 |
Publication |
International Journal of Sustainable Lighting |
Abbreviated Journal |
IJSL |
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18 |
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9-15 |
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Keywords |
Society; conservation; dark sky places; dark sky; National parks; dark sky parks; national parks; Luminescent Measurements; Night sky brightness |
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Since the invention of electric lighting in the nineteenth century, the steadily increasing use of artificial light at night in outdoor spaces has grown to threaten the integrity of dark night skies and nocturnal terrestrial spaces. The conservation community has gradually come to accept the need to protect natural nighttime darkness, which finds expression in dark sky parks and similar protected areas. As these places begin to reap tangible economic benefits in the form of sustainable ‘astrotourism,’ the movement to actively protect them gains strength. The International Dark-Sky Association designates Dark Sky Parks and Reserves under a comparative ranking scheme that assigns night sky quality tiers according to a combination of objective and subjective characteristics, but shortcomings in the consistency of these ratings exist that undermine the consistency and reputation of the designation program. Here we consider potential changes to the qualification regime to make the ratings system more robust for the benefit of future designations. |
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3323 N 1st Ave, Tucson, AZ, 85719 USA; john(at)darksky.org |
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International Journal of Sustainable Lighting |
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English |
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English |
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2586-1247 |
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IDA @ john @ |
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1779 |
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