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We present a novel method for estimating 3-D positions of near light sources by using highlights on the outside and inside of a single clear hollow sphere. Conventionally, the positions of near light sources have been estimated by using observed highlights on multiple reference objects, e.g. mirror balls., ICPR 2012 : 21th International Conference on Pattern Recognition , Nov 11-15, 2012 , Tsukuba, Japan

This paper describes a real-time pre-visualization method using augmented reality techniques for videographers. It enables them to test camera work without real actors in a real environment. As a substitute for real actors, virtual ones are superimposed on a live video in real-time according to a real camera motion and an illumination condition. The key technique of this method is real-time motion estimation of a camera, which can be applied to unknown complex environments including natural objects. In our method, geometric and photometric registration problems for such unknown environments are solved to realize the above visualization. A prototype system demonstrates availability of the previsualization method., ICME 2008 : IEEE International Conference on Multimedia & Expo , Jun 23-26, 2008 , Hannover, Germany

This paper describes a novel method for estimating positions and postures of an omnidirectional multi-camera system from its multiple image sequences and sparse position data acquired by GPS. The proposed method is based on a structure-from-motion technique which is enhanced by using multiple image sequences as well as GPS position data. Moreover, the position data are also used to remove mis-tracked features. The proposed method allows us to estimate position and posture without accumulative errors and annoying effects due to moving objects in outdoor environments. The validity of the method is demonstrated through experiments using both synthetic and real outdoor scenes., First Korea-Japan Joint Workshop on Pattern Recognition , Nov 23-24, 2006 , Jeju, Korea

Technology that enables users to experience a remote site virtually is called telepresence. A telepresence system using real environment images is expected to be used in the field of entertainment, medicine, education and so on. This paper describes a novel telepresence system which enables users to walk through a photorealistic virtualized environment by actual walking. To realize such a system, a wide-angle high-resolution movie is projected on an immersive multi-screen display to present users the virtualized environments and a treadmill is controlled according to detected user's locomotion. In this study, we use an omnidirectional multi-camera system to acquire images real outdoor scene. The proposed system provides users with rich sense of walking in a remote site., Stereoscopic Displays and Virtual Reality Systems XI , Jan 19-22, 2004 , San Jose, CA, USA

This paper describes a novel telepresence system which enables users to walk through a photorealistic virtualized environment by actual walking. To realize such a system, a wide-angle high-resolution movie is projected on an immersive multi-screen display to present users the virtualized environments and a treadmill is controlled according to detected user's locomotion. In this study, we use an omnidirectional multi-camera system to acquire images of a real outdoor scene. The proposed system provides users with rich sense of walking in a remote site., ICPR 2004 : 17th International Conference on Pattern Recognition , Aug 23-26, 2004 , Cambridge, UK

Urinary excretion of cyclic AMP, cyclic GMP, inorganic phosphorus, calcium, sodium, potassium and creatinine was measured in 138 healthy male and 104 healthy female humans from 2 to 68 years old. The range of cyclic nucleotide excretion was as follows: cyclic AMP (mumol/day), 1.01-10.89; cyclic GMP (mumol/day), 0.13-2.00; cyclic AMP (mumol/g creatinine), 1.52-8.93; cyclic GMP (mumol/g creatinine), 0.11-1.87. The 242 volunteers were grouped into seven classes according to age: A, 2-9 years old; B, 10-19; C, 20-29; D, 30-39; E, 40-49; F, 50-59 and G, 60-68. Average excretion (mumol/day) of cyclic AMP in class A (2.62 +/- 0.29 for males and 2.30 +/- 0.18 for females) was significantly smaller than that in other classes (4.59 +/- 0.12 for males and 3.90 +/- 0.13 for females) (p less than 0.01). Such a significant difference was not observed in cyclic GMP excretion. In terms of mumol/g creatinine, however, average excretion of both cyclic AMP and cyclic GMP in class A was greater than that in other classes. The amounts of urinary cyclic AMP and cyclic GMP (mumol/day) were correlated with age in the subjects from 2 to 16 years. A reverse correlation between the amounts of both nucleotides (mumol/g creatinine) and age was found in the young subjects. No correlation between the excretion of either urinary cyclic nucleotide and age was found in adults. A significantly positive correlation between cyclic AMP (mumol/day) and inorganic phosphorus (g/day) was found (r = 0.50 for males and 0.56 for females) (p less than 0.01). This correlation suggests that urinary cyclic AMP might reflect the activity of parathyroid hormone in normal humans. There was no significant correlation between cyclic GMP and electrolytes tested. The above results are considered to provide basic data for clinical evaluation of relevant disorders.