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This paper proposes a method to realize a 3D video system that can capture video data from multiple cameras, reconstruct 3D models, transmit 3D video streams via the network, and display them on remote PCs. All processes are done in real time. We represent a player with a simplified 3D model consisting of a single plane and a live video texture extracted from multiple cameras. This 3D model is simple enough to be transmitted via a network. A prototype system has been developed and tested at actual soccer stadiums. A 3D video of a typical soccer scene, which includes more than a dozen players, was processed at video rate and transmitted to remote PCs through the internet at 15-24 frames per second.

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439The relative diffusion of a pair of dye particles in homogeneous steady turbulence is studied from the viewpoint that the turbulent transport is due to the vortex stretching of eddies in the inertial range. Thus, with the aid of Mori's (1980) formula for the vortex stretching, it is shown that the eddy diffusi'On rate is given bythe mean square of the relative distance of the pair at time f, c the mean rate of the energy transfer from large eddies to small eddies, L the length scale of the production range and f.1. the intermittency exponent. It turns out that A~1.39 for f.1.=0 and 1.22 for f.1.=1/3, where Kolmogorov's constant is taken to be 1.5. This diffusion law is valid for L>L.(t)-:?ld, where ld is the length scale of the dissipation range. Hence it turns out that Richardson's (1926) empirical 4/3 law holds if f.1. is very small. If L.("t)-:? L.(O), then L. 2(t)~ f3/0-Pl. Therefore, if 0.25;S f.1.::S 0.5 as experiments indicate, then the intermittency correction leads to an appreciable deviation from the f3 law. The condition L.(t)

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Occasions to administer endovascular treatment to the elderly have increased, for which rapid and safe guiding catheter (GC) placement even in a lesion with severe arteriosclerosis is required. We investigated an index to easily evaluate the degree of difficulty before treatment. Methods: In all, 83 consecutive patients who received carotid artery stenting (CAS) through the transfemoral approach at our institution between May 2010 and December 2016 were divided into those in whom GC could be placed using the JB2-type inner catheter (IC) (JB2 group) and those who required the Simmons type or Goose neck snare (SM/GS group). Vascular anatomy of the cervicothoracic region was evaluated and an index to select IC was investigated. Results: The JB2 and SM/GS groups consisted of 68 and 15 patients, respectively. The distributions of the following five items were different between the two groups: The level of the origin of the selected artery from the lesser curvature of the aortic arch, aorta type, tortuosity of the common carotid artery, selected artery, and location of the lesion. On decision tree analysis of these factors, a flowchart was prepared in which a lower level of the origin of the selected artery than the level of the lesser curvature of the aortic arch was the first layer. Conclusion: IC selection can be more accurately evaluated based on whether the level of the origin of the selected artery is lower than the level of the lesser curvature of the aortic arch compared with evaluation of the aorta type III.