Haruyuki Harada

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In this paper, we propose a system which calculates optical flow in real-time based on multichannel integration using different filters. The multichannel integration refers to the method for calculating more accurate velocity field, but it takes much time to calculate. This calculation time can be shortened by the ingenuity for speeding up including(More)
In this paper we propose an optical flow (a velocity field of the appearance in the image) estimation method using Graphics Processing Unit (GPU). To estimate optical flow, we use Spatiotemporal Differentiation Method<sup>[1]</sup>. In order to improve the feature that this method is influenced easily by the noise in the image, we use Multichannel(More)
The authors propose a new method for reducing both impulsive noise and white noise by use of M-transform and wavelet shrinkage. M-transform is a new signal transformation proposed by the authors, and any periodic time signal can be considered as the output of a filter whose input is an M-sequence. By using the properties of M-transform, it is shown that(More)
In this paper, we try to estimate directly the time variations and the peak values of the breath alcohol concentration (BrAC) after drinking. First, the time variations of the BrAC is applied to the impulse response models of the 2nd order lag + time delay and the 3rd order lag. The Dirac's Delta functions are used to investigate the difference between(More)
A 0.4-5.8 GHz high linearity SiGe-MMIC quadrature-modulator (Q-MOD) having a novel self mixer current control circuit is described. This control circuit, which consists of an output power detector and an envelope current feedback circuit, is applied to unit mixers, and it automatically controls the mixer current according to the output power level. As a(More)
A low spurious SiGe-MMIC direct conversion transceiver using 2f<sub>LO</sub> LO switching configuration for cognitive radio is described. In the proposed configuration, LO signals for Tx and Rx blocks are generated by frequency divider behind switching circuits. By applying this configuration to the transceiver, the offset frequency of maximum Tx spurious(More)
In previous paper[1], we suggested a new algorithm to estimate optical flow and motion parameters (angular velocity and scale of enlargement). There are two advantages in this method. First, more accurate optical flow and motion parameters can be estimated because it is strictly consistent with the assumption that the motion contains not only translation(More)
In the previous research, we proposed an oculomotor system which expanded the limits of velocity measurement using spatiotemporal differentiation method. It was proved that the accurate optical flow was estimated at large object velocity by using this system. In this paper, we propose optical flow estimation method using oculomotor system where multiple(More)
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