@article{oai:twinkle.repo.nii.ac.jp:00017141,
 author = {高崎, かおり and 高山, 幹子 and 石井, 哲夫},
 issue = {8},
 journal = {東京女子医科大学雑誌},
 month = {Aug},
 note = {Examinations of sleep apnea syndrome, which require various monitors to be attached to the body, can impose a heavy burden on patients. We have devised a system whereby respiratory movement is measured, without restricting patients, by analyzing video taped images of patients. To explain the principle of image analysis first, images of the chest and abdomen are divided into small areas and the movement of each area is followed by the tracking method. Then overall movement is obtained from the average of velocity spectra (optical flow). The movement thus recorded is processed by tracking vision and computer. The image can be analyzed either in real time or retrospectively. Appropriate conditions for recording were as follows; illumination of 10 lux or more, a richly patterned bedcover, the surface of which was uneven so that tracking could easily be done. The camera was positioned at the foot of the bed at an angle of 35° to the horizontal plane of the body. When the results of this system were compared with those of the simultaneously performed conventional method using a respiration band, there was little difference in the respiratory movement, operational factor or apnea index. Thus, this system was found to be capable of diagnosing sleep apnea syndrome.},
 pages = {401--408},
 title = {ビデオ画像による睡眠中呼吸運動解析の試み},
 volume = {68},
 year = {1998}
}