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Spatio-Temporal Frequency Characteristics Measurement of Contrast Sensitivity for Smart Lighting
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 05, 2016 by SAE International in United States
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This study aims at the development of a projection pattern that is capable of shortening the time required by a driver to perceive a pedestrian at night when a vehicle’s high beams are utilized. Our approach is based on the spatio-temporal frequency characteristics of human vision. Visual contrast sensitivity is dependent on spatiotemporal frequency, and maximum contrast sensitivity frequency varies depending on environmental luminance. Conventionally, there are several applications that utilize the spatio-temporal frequency characteristics of human vision. For example, the National Television System Committee (NTSC) television format takes into consideration low-sensitivity visual characteristics. In contrast, our approach utilizes high-sensitivity visual characteristics based on the assumption that the higher contrast sensitivity of spatio-temporal frequencies will correlate more effectively with shorter perception times. To test this hypothesis, we conducted experiments aimed at determining maximum contrast sensitivity frequencies under simulated nighttime lighting levels using a Campbell-Robson chart, which allowed us to change spatial frequency and contrast levels smoothly. We then changed the brightness levels of specific temporal frequencies using this chart, and asked test participants to plot threshold lines showing the maximized contrast sensitivity of each temporal frequency. Next, we extracted the spatio-temporal frequencies showing the highest contrast sensitivity for each test subject, and investigated the frequency distribution. We found out that maximum sensitivity spatial frequency is around 1 cycles/degree, and the maximum sensitivity temporal frequency is around 6 Hz. In our future studies, we will evaluate the time required for drivers to perceive pedestrians at night using these frequencies.
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- Kazuya Asaoka - Toyota Motor Corporation
- Sho Masuda - Toyota Motor Corporation
- Kazuhiko Nakashima - Toyota Motor Corporation
- Shinichi Kojima - Toyota Central R&D Labs., Inc.
- Shigeyoshi Hiratsuka - Toyota Central R&D Labs., Inc.
- Nobuyuki Shiraki - Toyota Central R&D Labs., Inc.
- Kazunori Higuchi - Toyota Central R&D Labs., Inc.
- Toshihiko Tsukada - Toyota Central R&D Labs., Inc.
- Keiichi Shimaoka - Toyota Central R&D Labs., Inc.
CitationKojima, S., Hiratsuka, S., Shiraki, N., Higuchi, K. et al., "Spatio-Temporal Frequency Characteristics Measurement of Contrast Sensitivity for Smart Lighting," SAE Technical Paper 2016-01-1420, 2016, https://doi.org/10.4271/2016-01-1420.
- Japanese National Police Agency, Traffic Bureau The feature of fatal traffic accidents and the situation of crackdown on traffic law violations in 2014 (in Japanese) http://www.e/stat.go.jp/SG1/estat/List.do?lid=000001129473 2015
- ITARDA INFORMATION (in Japanese) 83 4 5 2010
- ITARDA INFORMATION (in Japanese) 90 8 2011
- Sasaki M. Headlamp technology trends and safety environmental issues (in Japanese) JAMAgazine 47 2013 10 8 13 2013
- Oshio , H. , Hori , T. , Mochizuki , K. , Mouri , F. et al. Development of Adaptive Driving Beam Headlamps and its Commercialization (in Japanese) Journal of Society of Automotive Engineering of Japan 68 6 2014
- Soga , M. , Hiratsuka , S. , Fukamachi , H. , and Ninomiya , Y. Pedestrian Detection for a Near Infrared Imaging System International IEEE Conference on Intelligent Transportation Systems 1167 1172 2008
- Wakita , J. , Kawamata , S. , Murano , T. , Fukamachi , H. et al. Night View System” with Pedestrian Detection Using Near-Infrared Light World Congress on Intelligent Transport Systems 2008
- Tamburo , R. , Nurvitadhi , E. , Chugh , A. , Chen , M. et al. Programmable Automotive Headlights European Conference of Computer Vision 2014
- Kandel , E. R. , Schwartz , J., H. , Jessell , T., M. , Siegelbaum , S., A. et al. PRINCIPLES OF NEURAL SCIENCE fifth 591 2012
- Yoshida , T. Interlace and progressive scan (in Japanese) Knowledge base http://www.ieice-hbkb.org/ The Institute of Electronics, Information and Communication Engineers
- Yoshida , T. The format of the color signal (in Japanese) Knowledge base http://www.ieice-hbkb.org/ The Institute of Electronics, Information and Communication Engineers
- Funakawa , M. Ambient Information Display Method Based upon Spatio-temporal Properties of Driver’s Field of View (in Japanese) Transactions of Society of Automotive Engineering of Japan 40 5 1191 1196 2009
- Kojima , S. , Hiratsuka , S. , Shiraki , N. , Higuchi , K. et al. Smart Lighting for Enhancing Drivers' Visual Perception -Spatial Temporal Frequency Characteristics Measurement of Contrast Sensitivity- (in Japanese) Proceedings of Society of Automotive Engineering of Japan, 20155044 9-15 244 249 2015
- Campbell , F. W. , and Robson , J. G. Application of Fourier analysis to the visibility of gratings Journal of Physiology 197 551 566 1968
- Valois , R. L. D. , Morgan , H. , and Snodderly , D. M. Psychophysical studies of monkey Vision-III. Spatial luminance contrast sensitivity tests of macaque and human observers Vison Research 14 75 81 1974
- De Lange , H. Research into the dynamic nature of the human fovea? Cortex systems with intermittent and modulated light. I. Attenuation characteristics with white and colored light Journal of the Optical Society of America 48 777 783 1958
- Kandel , E. R. , Schwartz , J. H. , Jessell , T. M. , Siegelbaum , S. A. et al. PRINCIPLES OF NEURAL SCIENCE fifth 590 594 2012
- Kelly , D. H. Motion and vision. II. Stabilized spatio-temporal threshold surface Journal of the Optical Society of America 69 1340 1349 1979
- Ohzawa , I. Make Your Own Campbell-Robson Contrast Sensitivity Chart http://ohzawa-lab.bpe.es.osaka-u.ac.jp/ohzawa-lab/izumi/CSF/A_JG_RobsonCSFchart.html
- Roufs , J. A. J. Light as a true visual quantity: principles of measurement CIE Publication No. 41 1978