著者
北村 純一
出版者
兵庫教育大学
巻号頁・発行日
2009-03

学位論文内容の要旨
著者
中川 博文 北村 純一 近藤 徹 飯沼 和三 高橋 賞
出版者
一般社団法人日本機械学会
雑誌
日本機械学会論文集. A編 (ISSN:03875008)
巻号頁・発行日
vol.61, no.582, pp.466-471, 1995-02-25
被引用文献数
4

The efficiency of visual biofeedback (VFB) training method using a Photoelastic imaging system on restoring and stabilizing a standing position of stroke patients was investigated. As a stroke group, seven hemiplegics were selected with the mean of 57 year-old. Twelve age-matched healthy subjects were selected as controls. The subjects were asked to stand upright on the photoelastic apparatus and to gaze at a marker 1.5M distant on the wall. Then, VFB training was performed for ten minutes by self recognition of his own pressure patterns which were produced by photoelastic system and were monitored on a TV screen. The patterns were photographed in each different condition such as in a standing position with eyes open or closed before and after l0-minute-training with VFB, and were comparatively analysed. The results showed that (1) the ratio of affected side to unaffected definded by the number of first fringes produced increased significantly after VFB up to the control level, (2) the ratio of body weight loading on the affected side to unaffected was significantly increased after VFB, and (3) the position of center of contact pressure on the longitudinal axis of an affected sole was found to be significantly more posteriorly sifted than in the control and was remained unchanged after VFB. In conclusion, the VFB method using a photoelastic imaging system may be useful to enhance visual-contact motor balancing functions in patients with hemiplegics and also to study a restoring process of neurological impairment leading to a postural problem.
著者
北村 純一 西村 敏博
出版者
一般社団法人電子情報通信学会
雑誌
電子情報通信学会技術研究報告. IE, 画像工学 (ISSN:09135685)
巻号頁・発行日
vol.107, no.358, pp.93-96, 2007-11-22

イメージセンサで撮影した際に,撮影画像にノイズが混入する.ノイズには大きく分けて固定パターンノイズとランダムノイズが存在する.前者はフォトダイオードやトランジスタの感度やしきい値のバラツキで発生するが,半導体製造技術の向上によって減少している.今後はランダムノイズが支配的になると予測されている.本研究はランダムノイズの一種であるフォトンショットノイズに注目している.フォトンショットノイズは低照度の環境で撮影した際に特に支配的になる.このフォトンショットノイズを,ウェーブレット変換及び適応的フィルタ処理を用いて低減する.提案手法は従来手法と比較して効果的に画像復元できることが示唆された.