{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9628730","patent":{"patent_number":"US-9628730","title":"Dark current gradient estimation using optically black pixels","assignee":null,"inventors":[],"filing_date":"2015-01-27T00:00:00.000Z","publication_date":"2017-04-18T00:00:00.000Z","cpc_codes":["H04N","H04N","H04N","H04N"],"num_claims":18,"abstract":"A method for removing background signal values from readout signal values generated by image pixels in a pixel array may include generating background signal values using optically black pixels formed around a border of the pixel array. The background signal values may be separated into blocks. Block average values may be calculated based on the background signal values included in each of the blocks. Corner regions of the pixel array may be free of image pixels and optically black pixels. Corner background signal values may be extrapolated based on the block average values. Image pixel background signal values may be interpolated based on the block average values and the corner background signal values. The image pixel background signal values may be subtracted from the readout values."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Dark current gradient estimation using optically black pixels","description":"A method for removing background signal values from readout signal values generated by image pixels in a pixel array may include generating background signal values using optically black pixels formed","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9628730","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-9628730","citation_suggestion":"Patentable. \"Dark current gradient estimation using optically black pixels\" (US-9628730). https://patentable.app/patents/US-9628730","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9628730","json":"https://patentable.app/api/llm-context/US-9628730","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T09:21:32.218Z"}