{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2006:PIKM747X5UH7A3UBVUOG4EJWEE","short_pith_number":"pith:PIKM747X","canonical_record":{"source":{"id":"cs/0606073","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"cs.IR","submitted_at":"2006-06-15T13:13:30Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"75bedf7c537bf3969332499e98d454b5dd54ac7a469696db049a83e1f22d8577","abstract_canon_sha256":"7cf997a2e131a7835c874bea2fe69ef1c6c2bc507ed61eca0b6348c03af411ce"},"schema_version":"1.0"},"canonical_sha256":"7a14cff3f7ed0ff06e81ad1c6e11362136a8f81244fee30a385d51c854def4ee","source":{"kind":"arxiv","id":"cs/0606073","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"cs/0606073","created_at":"2026-05-18T01:08:54Z"},{"alias_kind":"arxiv_version","alias_value":"cs/0606073v1","created_at":"2026-05-18T01:08:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.cs/0606073","created_at":"2026-05-18T01:08:54Z"},{"alias_kind":"pith_short_12","alias_value":"PIKM747X5UH7","created_at":"2026-05-18T12:25:54Z"},{"alias_kind":"pith_short_16","alias_value":"PIKM747X5UH7A3UB","created_at":"2026-05-18T12:25:54Z"},{"alias_kind":"pith_short_8","alias_value":"PIKM747X","created_at":"2026-05-18T12:25:54Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2006:PIKM747X5UH7A3UBVUOG4EJWEE","target":"record","payload":{"canonical_record":{"source":{"id":"cs/0606073","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"cs.IR","submitted_at":"2006-06-15T13:13:30Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"75bedf7c537bf3969332499e98d454b5dd54ac7a469696db049a83e1f22d8577","abstract_canon_sha256":"7cf997a2e131a7835c874bea2fe69ef1c6c2bc507ed61eca0b6348c03af411ce"},"schema_version":"1.0"},"canonical_sha256":"7a14cff3f7ed0ff06e81ad1c6e11362136a8f81244fee30a385d51c854def4ee","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:08:54.672053Z","signature_b64":"B2wTE0XvuIPwCLyJ53V7GzpoDSBNCYVJ7toD9GQDxIOUvG0XKmrMsGDFaVrxiPDiQt0nB8OvP48xjNnbwb6kBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7a14cff3f7ed0ff06e81ad1c6e11362136a8f81244fee30a385d51c854def4ee","last_reissued_at":"2026-05-18T01:08:54.671576Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:08:54.671576Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"cs/0606073","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:08:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CtGOJtMwv36J7NPOeKDNWc1UZcsa65tlV27p10jgrflJoSUG9dTuJI/Ojcc+GQ7huEmQTVUFUBVz2b9r5NyrDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T13:26:06.618392Z"},"content_sha256":"e49f01b093625f595275faab6760b9c98bc81b67b136021f6948da92334ca5ac","schema_version":"1.0","event_id":"sha256:e49f01b093625f595275faab6760b9c98bc81b67b136021f6948da92334ca5ac"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2006:PIKM747X5UH7A3UBVUOG4EJWEE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Comparison of the estimation of the degree of polarization from four or two intensity images degraded by speckle noise","license":"","headline":"","cross_cats":["physics.optics"],"primary_cat":"cs.IR","authors_text":"Muriel Roche (IF), Philippe R\\'efr\\'egier (IF)","submitted_at":"2006-06-15T13:13:30Z","abstract_excerpt":"Active polarimetric imagery is a powerful tool for accessing the information present in a scene. Indeed, the polarimetric images obtained can reveal polarizing properties of the objects that are not avalaible using conventional imaging systems. However, when coherent light is used to illuminate the scene, the images are degraded by speckle noise. The polarization properties of a scene are characterized by the degree of polarization. In standard polarimetric imagery system, four intensity images are needed to estimate this degree . If we assume the uncorrelation of the measurements, this number"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"cs/0606073","kind":"arxiv","version":1},"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:08:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cQQr8Er121mfP3uBK5CnLNn3e6s2y2yyygtKEpm5M++S7rqJVR3t08mdkQeXPAdc1YuVyUg5umO3GkGGAVNKBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T13:26:06.618807Z"},"content_sha256":"cc9b2c9930cb7bc4e97195f703494125f0de79042de39eebd28f996776ef8f6b","schema_version":"1.0","event_id":"sha256:cc9b2c9930cb7bc4e97195f703494125f0de79042de39eebd28f996776ef8f6b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PIKM747X5UH7A3UBVUOG4EJWEE/bundle.json","state_url":"https://pith.science/pith/PIKM747X5UH7A3UBVUOG4EJWEE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PIKM747X5UH7A3UBVUOG4EJWEE/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-01T13:26:06Z","links":{"resolver":"https://pith.science/pith/PIKM747X5UH7A3UBVUOG4EJWEE","bundle":"https://pith.science/pith/PIKM747X5UH7A3UBVUOG4EJWEE/bundle.json","state":"https://pith.science/pith/PIKM747X5UH7A3UBVUOG4EJWEE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PIKM747X5UH7A3UBVUOG4EJWEE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2006:PIKM747X5UH7A3UBVUOG4EJWEE","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"7cf997a2e131a7835c874bea2fe69ef1c6c2bc507ed61eca0b6348c03af411ce","cross_cats_sorted":["physics.optics"],"license":"","primary_cat":"cs.IR","submitted_at":"2006-06-15T13:13:30Z","title_canon_sha256":"75bedf7c537bf3969332499e98d454b5dd54ac7a469696db049a83e1f22d8577"},"schema_version":"1.0","source":{"id":"cs/0606073","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"cs/0606073","created_at":"2026-05-18T01:08:54Z"},{"alias_kind":"arxiv_version","alias_value":"cs/0606073v1","created_at":"2026-05-18T01:08:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.cs/0606073","created_at":"2026-05-18T01:08:54Z"},{"alias_kind":"pith_short_12","alias_value":"PIKM747X5UH7","created_at":"2026-05-18T12:25:54Z"},{"alias_kind":"pith_short_16","alias_value":"PIKM747X5UH7A3UB","created_at":"2026-05-18T12:25:54Z"},{"alias_kind":"pith_short_8","alias_value":"PIKM747X","created_at":"2026-05-18T12:25:54Z"}],"graph_snapshots":[{"event_id":"sha256:cc9b2c9930cb7bc4e97195f703494125f0de79042de39eebd28f996776ef8f6b","target":"graph","created_at":"2026-05-18T01:08:54Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"Active polarimetric imagery is a powerful tool for accessing the information present in a scene. Indeed, the polarimetric images obtained can reveal polarizing properties of the objects that are not avalaible using conventional imaging systems. However, when coherent light is used to illuminate the scene, the images are degraded by speckle noise. The polarization properties of a scene are characterized by the degree of polarization. In standard polarimetric imagery system, four intensity images are needed to estimate this degree . If we assume the uncorrelation of the measurements, this number","authors_text":"Muriel Roche (IF), Philippe R\\'efr\\'egier (IF)","cross_cats":["physics.optics"],"headline":"","license":"","primary_cat":"cs.IR","submitted_at":"2006-06-15T13:13:30Z","title":"Comparison of the estimation of the degree of polarization from four or two intensity images degraded by speckle noise"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"cs/0606073","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:e49f01b093625f595275faab6760b9c98bc81b67b136021f6948da92334ca5ac","target":"record","created_at":"2026-05-18T01:08:54Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"7cf997a2e131a7835c874bea2fe69ef1c6c2bc507ed61eca0b6348c03af411ce","cross_cats_sorted":["physics.optics"],"license":"","primary_cat":"cs.IR","submitted_at":"2006-06-15T13:13:30Z","title_canon_sha256":"75bedf7c537bf3969332499e98d454b5dd54ac7a469696db049a83e1f22d8577"},"schema_version":"1.0","source":{"id":"cs/0606073","kind":"arxiv","version":1}},"canonical_sha256":"7a14cff3f7ed0ff06e81ad1c6e11362136a8f81244fee30a385d51c854def4ee","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7a14cff3f7ed0ff06e81ad1c6e11362136a8f81244fee30a385d51c854def4ee","first_computed_at":"2026-05-18T01:08:54.671576Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:08:54.671576Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"B2wTE0XvuIPwCLyJ53V7GzpoDSBNCYVJ7toD9GQDxIOUvG0XKmrMsGDFaVrxiPDiQt0nB8OvP48xjNnbwb6kBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:08:54.672053Z","signed_message":"canonical_sha256_bytes"},"source_id":"cs/0606073","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e49f01b093625f595275faab6760b9c98bc81b67b136021f6948da92334ca5ac","sha256:cc9b2c9930cb7bc4e97195f703494125f0de79042de39eebd28f996776ef8f6b"],"state_sha256":"d13a0b1777d050913ca720ac42763f7a21f8159645717cedb40dbcfa9a00c444"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EwzCLa2ahOByvRrs/jj5X7rNo5CvAm65MjCjAYAcLY7nzaySSGX23iWRbJiglTmC4msRO/CKZxMkq+GAUjsFBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T13:26:06.620749Z","bundle_sha256":"7f522ca9886ee81678773d4c1af4ec3755e9f49e874d3aa3631ff4a9d9aeafaf"}}