{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9692937","patent":{"patent_number":"US-9692937","title":"Methods and apparatus for identifying lines in an image and using identified lines","assignee":null,"inventors":[],"filing_date":"2015-02-10T00:00:00.000Z","publication_date":"2017-06-27T00:00:00.000Z","cpc_codes":["G06V","G06T","H04N","H04N","G06T","G06T","G06T","H04N"],"num_claims":16,"abstract":"Methods and apparatus for: identifying perimeter lines in an image, e.g., document border lines forming a non-rectangular quadrilateral corresponding to a scanned document, determining document corner points, and correcting the input image based on determined corner points are described. Lines are identified in the input image and a line weight is generated for each identified line. The identified lines are classified into two different groups based on direction, e.g., predominately vertical or predominately horizontal. For each group at least two, and sometimes more, candidate perimeter lines are determined to be kept, based on line weight and line length, and other lines in the group are eliminated. Two best candidate perimeter lines are identified from each group, e.g., based on distance between the remaining lines in the group. Four document corner points are determined based on the remaining lines in the two groups."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Methods and apparatus for identifying lines in an image and using identified lines","description":"Methods and apparatus for: identifying perimeter lines in an image, e.g., document border lines forming a non-rectangular quadrilateral corresponding to a scanned document, determining document corner","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9692937","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-9692937","citation_suggestion":"Patentable. \"Methods and apparatus for identifying lines in an image and using identified lines\" (US-9692937). https://patentable.app/patents/US-9692937","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9692937","json":"https://patentable.app/api/llm-context/US-9692937","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T09:54:24.727Z"}