{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-11268880","patent":{"patent_number":"US-11268880","title":"Method of detecting the cleanliness of a lens using differential flat field correction of pupil incidence","assignee":null,"inventors":[],"filing_date":"2021-09-24T00:00:00.000Z","publication_date":"2022-03-08T00:00:00.000Z","cpc_codes":["G06T","G06T","H04N","G06T","G06T","G06T","G06T","G06T"],"num_claims":3,"abstract":"A method for detecting lens cleanliness of a lens in a flat-field optical path, the flat-field optical path includes a light source, the lens, a camera, the light source is a narrow-band multispectral uniform surface light source, the camera's light-sensitive surface is disposed perpendicular to an optical axis of the lens and in the light position of the lens and a pupil interposed between the lens and the light source, the method including collecting the bright-field image data and dark-field image data for a plurality of pupil aperture sizes through the lens; for each pixel, performing a pupil differential flat field correction to yield a plurality of PiPj pupil differentials; and displaying the pupil differentials in the form of a plurality of images to show uniformity of each image, wherein a non-uniform area on each image is determined to have been caused by an impurity of the lens."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Method of detecting the cleanliness of a lens using differential flat field correction of pupil incidence","description":"A method for detecting lens cleanliness of a lens in a flat-field optical path, the flat-field optical path includes a light source, the lens, a camera, the light source is a narrow-band multispectral","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-11268880","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-11268880","citation_suggestion":"Patentable. \"Method of detecting the cleanliness of a lens using differential flat field correction of pupil incidence\" (US-11268880). https://patentable.app/patents/US-11268880","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-11268880","json":"https://patentable.app/api/llm-context/US-11268880","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-30T15:31:58.304Z"}