{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9721180","patent":{"patent_number":"US-9721180","title":"Estimating respiratory phase from a video of a subject","assignee":null,"inventors":[],"filing_date":"2015-12-15T00:00:00.000Z","publication_date":"2017-08-01T00:00:00.000Z","cpc_codes":["A61B","A61B","A61B","A61B","A61B","G06T","G06V","A61B","G06F","G06T","G06V"],"num_claims":20,"abstract":"A video is received of a region of a subject where a signal corresponding to respiratory function can be registered by a video device. Pixels in the region in each of the image frames are processed to identify a respiratory pattern with peak/valley pairs. A peak/valley pair of interest is selected. An array of optical flow vectors is determined between a window of groups of pixel locations in a reference image frame corresponding to a peak of the pair/valley pair and a window in each of a number of image frames corresponding to the respiratory signal between the peak and ending at a valley point. Optical flow vectors have a direction and a magnitude. A ratio is determined between upwardly pointing optical flow vectors and downwardly pointing optical flow vectors. Based on the ratio, a determination is made whether the respiration phase for that peak/valley pair is inspiration or expiration."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Estimating respiratory phase from a video of a subject","description":"A video is received of a region of a subject where a signal corresponding to respiratory function can be registered by a video device. Pixels in the region in each of the image frames are processed to","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9721180","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-9721180","citation_suggestion":"Patentable. \"Estimating respiratory phase from a video of a subject\" (US-9721180). https://patentable.app/patents/US-9721180","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9721180","json":"https://patentable.app/api/llm-context/US-9721180","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T06:24:30.683Z"}