{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2018:4KGB73ZKCGHL3R6K3D2LTNUGQG","short_pith_number":"pith:4KGB73ZK","schema_version":"1.0","canonical_sha256":"e28c1fef2a118ebdc7cad8f4b9b6868187cfef0b419f3c343ee1d9f6bcb2bc52","source":{"kind":"arxiv","id":"1806.11468","version":2},"attestation_state":"computed","paper":{"title":"Simplified Active Calibration","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.CV","authors_text":"Anup Basu, Mehdi Faraji","submitted_at":"2018-06-29T15:17:32Z","abstract_excerpt":"We present a new mathematical formulation to estimate the intrinsic parameters of a camera in active or robotic platforms. We show that the focal lengths can be estimated using only one point correspondence that relates images taken before and after a degenerate rotation of the camera. The estimated focal lengths are then treated as known parameters to obtain a linear set of equations to calculate the principal point. Assuming that the principal point is close to the image center, the accuracy of the linear equations are increased by integrating the image center into the formulation. We extens"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1806.11468","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2018-06-29T15:17:32Z","cross_cats_sorted":[],"title_canon_sha256":"b46eb5f4530dff00b7b1928b23997eaee460bcc547c9f2a5b8ce44026adc849f","abstract_canon_sha256":"7de325b201cced26e3744f87e8b7edeba6aa0ca54c56d0e95c431840ddd5b81c"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:09:46.871711Z","signature_b64":"L64QT0v9ntp/DhfOZxQfV+a8VXt4GTKDriOWt38hZPID2fIReCyi1JJEjV1sAbqFOpNp6GG9D8ZTZ66nXGwoAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e28c1fef2a118ebdc7cad8f4b9b6868187cfef0b419f3c343ee1d9f6bcb2bc52","last_reissued_at":"2026-05-18T00:09:46.870958Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:09:46.870958Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Simplified Active Calibration","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.CV","authors_text":"Anup Basu, Mehdi Faraji","submitted_at":"2018-06-29T15:17:32Z","abstract_excerpt":"We present a new mathematical formulation to estimate the intrinsic parameters of a camera in active or robotic platforms. We show that the focal lengths can be estimated using only one point correspondence that relates images taken before and after a degenerate rotation of the camera. The estimated focal lengths are then treated as known parameters to obtain a linear set of equations to calculate the principal point. Assuming that the principal point is close to the image center, the accuracy of the linear equations are increased by integrating the image center into the formulation. We extens"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1806.11468","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"1806.11468","created_at":"2026-05-18T00:09:46.871081+00:00"},{"alias_kind":"arxiv_version","alias_value":"1806.11468v2","created_at":"2026-05-18T00:09:46.871081+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1806.11468","created_at":"2026-05-18T00:09:46.871081+00:00"},{"alias_kind":"pith_short_12","alias_value":"4KGB73ZKCGHL","created_at":"2026-05-18T12:32:05.422762+00:00"},{"alias_kind":"pith_short_16","alias_value":"4KGB73ZKCGHL3R6K","created_at":"2026-05-18T12:32:05.422762+00:00"},{"alias_kind":"pith_short_8","alias_value":"4KGB73ZK","created_at":"2026-05-18T12:32:05.422762+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/4KGB73ZKCGHL3R6K3D2LTNUGQG","json":"https://pith.science/pith/4KGB73ZKCGHL3R6K3D2LTNUGQG.json","graph_json":"https://pith.science/api/pith-number/4KGB73ZKCGHL3R6K3D2LTNUGQG/graph.json","events_json":"https://pith.science/api/pith-number/4KGB73ZKCGHL3R6K3D2LTNUGQG/events.json","paper":"https://pith.science/paper/4KGB73ZK"},"agent_actions":{"view_html":"https://pith.science/pith/4KGB73ZKCGHL3R6K3D2LTNUGQG","download_json":"https://pith.science/pith/4KGB73ZKCGHL3R6K3D2LTNUGQG.json","view_paper":"https://pith.science/paper/4KGB73ZK","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1806.11468&json=true","fetch_graph":"https://pith.science/api/pith-number/4KGB73ZKCGHL3R6K3D2LTNUGQG/graph.json","fetch_events":"https://pith.science/api/pith-number/4KGB73ZKCGHL3R6K3D2LTNUGQG/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/4KGB73ZKCGHL3R6K3D2LTNUGQG/action/timestamp_anchor","attest_storage":"https://pith.science/pith/4KGB73ZKCGHL3R6K3D2LTNUGQG/action/storage_attestation","attest_author":"https://pith.science/pith/4KGB73ZKCGHL3R6K3D2LTNUGQG/action/author_attestation","sign_citation":"https://pith.science/pith/4KGB73ZKCGHL3R6K3D2LTNUGQG/action/citation_signature","submit_replication":"https://pith.science/pith/4KGB73ZKCGHL3R6K3D2LTNUGQG/action/replication_record"}},"created_at":"2026-05-18T00:09:46.871081+00:00","updated_at":"2026-05-18T00:09:46.871081+00:00"}