{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:GJI2ZJRNDQMV5JXOBIZV3WVFYR","short_pith_number":"pith:GJI2ZJRN","canonical_record":{"source":{"id":"1508.05879","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2015-08-24T16:49:30Z","cross_cats_sorted":[],"title_canon_sha256":"ac627f10e3579f2837d5893f6713321533d722349c3364b823f08ad1d1d4a168","abstract_canon_sha256":"5407edf01dc9ccf3647d68995c40443a189e1050bc1c97079f875db17f6716f3"},"schema_version":"1.0"},"canonical_sha256":"3251aca62d1c195ea6ee0a335ddaa5c46f92a725e30dab5bb40336874f736087","source":{"kind":"arxiv","id":"1508.05879","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1508.05879","created_at":"2026-05-18T01:34:51Z"},{"alias_kind":"arxiv_version","alias_value":"1508.05879v1","created_at":"2026-05-18T01:34:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1508.05879","created_at":"2026-05-18T01:34:51Z"},{"alias_kind":"pith_short_12","alias_value":"GJI2ZJRNDQMV","created_at":"2026-05-18T12:29:22Z"},{"alias_kind":"pith_short_16","alias_value":"GJI2ZJRNDQMV5JXO","created_at":"2026-05-18T12:29:22Z"},{"alias_kind":"pith_short_8","alias_value":"GJI2ZJRN","created_at":"2026-05-18T12:29:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:GJI2ZJRNDQMV5JXOBIZV3WVFYR","target":"record","payload":{"canonical_record":{"source":{"id":"1508.05879","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2015-08-24T16:49:30Z","cross_cats_sorted":[],"title_canon_sha256":"ac627f10e3579f2837d5893f6713321533d722349c3364b823f08ad1d1d4a168","abstract_canon_sha256":"5407edf01dc9ccf3647d68995c40443a189e1050bc1c97079f875db17f6716f3"},"schema_version":"1.0"},"canonical_sha256":"3251aca62d1c195ea6ee0a335ddaa5c46f92a725e30dab5bb40336874f736087","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:34:51.495839Z","signature_b64":"0SqL4smMrk8ymG/AtM2zebOu0Y5j8EXtYcLGKsEJKyzLPOtQi5f0ZlIPDgyKu4rnu967gOcCxBJpQz2A1wFkDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3251aca62d1c195ea6ee0a335ddaa5c46f92a725e30dab5bb40336874f736087","last_reissued_at":"2026-05-18T01:34:51.495230Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:34:51.495230Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1508.05879","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":"2026-05-18T01:34:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+L35slfeN768qqZ30BFqU8rZh6L4Y7KJKcBd77VPc/WrNm77nXOKHE6C7YhL5KWmP8kRYvw/JDddADFkXzuyAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T06:55:27.810547Z"},"content_sha256":"4bf6981bbc1a82874c69115e16683921f33e6b614b7a1a13b755bf68180a12d9","schema_version":"1.0","event_id":"sha256:4bf6981bbc1a82874c69115e16683921f33e6b614b7a1a13b755bf68180a12d9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:GJI2ZJRNDQMV5JXOBIZV3WVFYR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Optical images-based edge detection in Synthetic Aperture Radar images","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.CV","authors_text":"Alejandro C. Frery, C\\'edric Marco-Detchart, Edurne Barrenechea, Gilberto P. Silva Junior, Humberto Bustince, Sandra Sandri","submitted_at":"2015-08-24T16:49:30Z","abstract_excerpt":"We address the issue of adapting optical images-based edge detection techniques for use in Polarimetric Synthetic Aperture Radar (PolSAR) imagery. We modify the gravitational edge detection technique (inspired by the Law of Universal Gravity) proposed by Lopez-Molina et al, using the non-standard neighbourhood configuration proposed by Fu et al, to reduce the speckle noise in polarimetric SAR imagery. We compare the modified and unmodified versions of the gravitational edge detection technique with the well-established one proposed by Canny, as well as with a recent multiscale fuzzy-based tech"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1508.05879","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":"2026-05-18T01:34:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"h8bSXuyrsBS/emvSjeaz4ehO2Jj4f7IU7ug7rJ+rbjdelczXGBCm3x3vY+3zpD/M3Hk8Q8aJuxtAWnncu+tMDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T06:55:27.810897Z"},"content_sha256":"4a0ae06b2bb1317a8b76d3e1ba7722e14c5d446eb21210be858619a599edd89a","schema_version":"1.0","event_id":"sha256:4a0ae06b2bb1317a8b76d3e1ba7722e14c5d446eb21210be858619a599edd89a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GJI2ZJRNDQMV5JXOBIZV3WVFYR/bundle.json","state_url":"https://pith.science/pith/GJI2ZJRNDQMV5JXOBIZV3WVFYR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GJI2ZJRNDQMV5JXOBIZV3WVFYR/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":"2026-06-23T06:55:27Z","links":{"resolver":"https://pith.science/pith/GJI2ZJRNDQMV5JXOBIZV3WVFYR","bundle":"https://pith.science/pith/GJI2ZJRNDQMV5JXOBIZV3WVFYR/bundle.json","state":"https://pith.science/pith/GJI2ZJRNDQMV5JXOBIZV3WVFYR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GJI2ZJRNDQMV5JXOBIZV3WVFYR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:GJI2ZJRNDQMV5JXOBIZV3WVFYR","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":"5407edf01dc9ccf3647d68995c40443a189e1050bc1c97079f875db17f6716f3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2015-08-24T16:49:30Z","title_canon_sha256":"ac627f10e3579f2837d5893f6713321533d722349c3364b823f08ad1d1d4a168"},"schema_version":"1.0","source":{"id":"1508.05879","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1508.05879","created_at":"2026-05-18T01:34:51Z"},{"alias_kind":"arxiv_version","alias_value":"1508.05879v1","created_at":"2026-05-18T01:34:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1508.05879","created_at":"2026-05-18T01:34:51Z"},{"alias_kind":"pith_short_12","alias_value":"GJI2ZJRNDQMV","created_at":"2026-05-18T12:29:22Z"},{"alias_kind":"pith_short_16","alias_value":"GJI2ZJRNDQMV5JXO","created_at":"2026-05-18T12:29:22Z"},{"alias_kind":"pith_short_8","alias_value":"GJI2ZJRN","created_at":"2026-05-18T12:29:22Z"}],"graph_snapshots":[{"event_id":"sha256:4a0ae06b2bb1317a8b76d3e1ba7722e14c5d446eb21210be858619a599edd89a","target":"graph","created_at":"2026-05-18T01:34:51Z","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":"We address the issue of adapting optical images-based edge detection techniques for use in Polarimetric Synthetic Aperture Radar (PolSAR) imagery. We modify the gravitational edge detection technique (inspired by the Law of Universal Gravity) proposed by Lopez-Molina et al, using the non-standard neighbourhood configuration proposed by Fu et al, to reduce the speckle noise in polarimetric SAR imagery. We compare the modified and unmodified versions of the gravitational edge detection technique with the well-established one proposed by Canny, as well as with a recent multiscale fuzzy-based tech","authors_text":"Alejandro C. Frery, C\\'edric Marco-Detchart, Edurne Barrenechea, Gilberto P. Silva Junior, Humberto Bustince, Sandra Sandri","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2015-08-24T16:49:30Z","title":"Optical images-based edge detection in Synthetic Aperture Radar images"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1508.05879","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":"sha256:4bf6981bbc1a82874c69115e16683921f33e6b614b7a1a13b755bf68180a12d9","target":"record","created_at":"2026-05-18T01:34:51Z","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":"5407edf01dc9ccf3647d68995c40443a189e1050bc1c97079f875db17f6716f3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2015-08-24T16:49:30Z","title_canon_sha256":"ac627f10e3579f2837d5893f6713321533d722349c3364b823f08ad1d1d4a168"},"schema_version":"1.0","source":{"id":"1508.05879","kind":"arxiv","version":1}},"canonical_sha256":"3251aca62d1c195ea6ee0a335ddaa5c46f92a725e30dab5bb40336874f736087","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3251aca62d1c195ea6ee0a335ddaa5c46f92a725e30dab5bb40336874f736087","first_computed_at":"2026-05-18T01:34:51.495230Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:34:51.495230Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0SqL4smMrk8ymG/AtM2zebOu0Y5j8EXtYcLGKsEJKyzLPOtQi5f0ZlIPDgyKu4rnu967gOcCxBJpQz2A1wFkDA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:34:51.495839Z","signed_message":"canonical_sha256_bytes"},"source_id":"1508.05879","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4bf6981bbc1a82874c69115e16683921f33e6b614b7a1a13b755bf68180a12d9","sha256:4a0ae06b2bb1317a8b76d3e1ba7722e14c5d446eb21210be858619a599edd89a"],"state_sha256":"b6827a9bb61f829e88e3b52f857033cc0236e17869185e4ded8d316afa2e3286"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"F6p+2Q46A0iQvieaL5XBJDFbdIeFWK3nQ4O1tU5GIBUkJEgBkI+BzKg0NGhcsOKar8eYJ57s+ueRJuyeait3Aw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-23T06:55:27.812838Z","bundle_sha256":"6c3236c793e6acbbb6ad9945884527370a9a284e5b1b20fffa721396fedd3176"}}