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Estimation of respiratory state is an important indicator for early detection of respiratory diseases. In particular, there is a demand for monitoring respiratory state during the night. One method of monitoring respiratory state is to use contact-type sensors. However, this method requires the installation of many sensors and a visit to a hospital, which place a burden on patients. Therefore, we propose to acquire respiratory-induced features from near-infrared face video images and investigate their similarity to measurements obtained with a respirometer for non-contact monitoring of respiratory state in the dark. Respiratory-induced features were obtained from pulse wave signals extracted from the face video images. The results showed correlations in several respiratory states. This study opens some perspectives in non-contact monitoring of respiratory states.<\/jats:p>","DOI":"10.1007\/s10015-023-00926-3","type":"journal-article","created":{"date-parts":[[2024,1,11]],"date-time":"2024-01-11T08:02:14Z","timestamp":1704960134000},"page":"197-203","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Monitoring respiratory state from near-infrared face video images"],"prefix":"10.1007","volume":"29","author":[{"given":"Koichi","family":"Ashida","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yuta","family":"Hino","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chawan","family":"Koopipat","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Keiko","family":"Ogawa-Ochiai","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Norimichi","family":"Tsumura","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2024,1,11]]},"reference":[{"key":"926_CR1","unstructured":"Kinki Central Respiratory Center, Sleep apnea syndrome. https:\/\/kcmc.hosp.go.jp\/cnt0_000236.html. 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