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We have successfully fabricated high-quality Si wire waveguides composed of amorphous Si. The surface bend of the waveguide was fairly reduced by annealing. The loss is 11.7 dB/mm before annealing and the loss is changed to 6.4 dB/mm after annealing, which indicates the importance of the waveguide-surface- imperfection loss.
In this paper, we propose a method of measuring the orientation of observed objects as a parametric model. The orientation is represented as angle of observed objects. We suppose that optical flow obtained from image have component of not only component of translational velocity but also revolution, scaling, and orientation. To estimate these components, it is necessary to construct nonlinear simultaneous...
Optical flow can be expressed as the distribution of velocity vectors and it can be used as a method of describing the moving objects. The knowledge of the optical flow is valuable information in many applications including motion detection, object segmentation, and so on. In this paper, we use spatiotemporal differentiation method to estimate the optical flow. This method enable us to calculate the...
In this paper, we propose a system to extract the moving object by the segmentation based on fast optical flow estimation. This optical flow estimation is based on multichannel integration for speeding up and can estimate more accurate optical flow fast. Moving object can be extracted by the segmentation using the obtained optical flow. Experimental results show that the segmentation based on the...
In this paper, we propose the technique for tracking the velocity of objects that combines the particle filter with optical flow. If color of the target or feature of its shape is unknown, some conventional particle filters are hard to apply because the prediction step of them are based on probabilistic theory. This problem can be solved by estimation method of optical flow. Experimental results show...
A hemi-teardrop-shaped probe designed to produce an intense optical near-field to a subwavelength spatial dimension is presented. The influence of probe shape on optical near-field enhancement is investigated using the finite-difference time-domain method. The numerical results show that the resonant wavelength can be controlled by adjusting the sharpness of the object.
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