Hokkaido University

Yamatake Corporation

Koa Oil Company, Limited

Kansai Coke and Chemicals Co., Ltd.

Ohba, Ryoji

Ryoji Ohba

Isao Hayashi

Hirofumi Yamashita

Yoshihito Tamanoi

A method includes a pixel-value correction step that causes an average and variance of pixel values in a second subregion inclusive of a first subregion inclusive of being formed of only one pixel in a comparison image resolved into pixels to match with an average and variance of pixel values in a subregion corresponding to the second subregion on a reference image similarly resolved into pixels, thereby to execute calculation that corrects the pixel value of each pixel in the first subregion in the comparison image by recognizing each of subregions to be the first subregion, the subregions being obtained when the comparison image is divided into the subregions respectively inclusive of being formed of only one pixel; and a change determination step that determines the presence/absence of a change in the object by comparing the reference image with a post-correction comparison image acquired through the pixel value correction step.

Object monitoring method, object monitoring apparatus, and object monitoring program storage medium

Subject identification method, apparatus and system

A semiconductor laser light modulation and demodulation system to be used in light communication system is realized. In the modulation system, strength modulated pressure wave or electromagnetic wave is directly applied to an active region of a semiconductor laser element and the frequency modulation is effected by varying an effective length of a laser resonator formed by the element. In the demodulation system, modulation signal is derived by an interference of the received laser light by splitting and then joining together after passing an interferometer having different path length arms.

Semiconductor laser light modulation and demodulation system

Growing community of inventors

Sapporo, Japan

Ryoji Ohba