{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:5FUV3Z3JNZK2RWFNBF5ECTXTZ6","short_pith_number":"pith:5FUV3Z3J","canonical_record":{"source":{"id":"1908.09007","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2019-08-16T12:05:14Z","cross_cats_sorted":["cs.LG"],"title_canon_sha256":"afdffbc03789e9bf1f71146585dad4305dc04c51dd6d79fe67e144fa065540bf","abstract_canon_sha256":"5544078c2d56bc9f418d2f8e1647999f40cbff2bae017dd91573d31c85e6de80"},"schema_version":"1.0"},"canonical_sha256":"e9695de7696e55a8d8ad097a414ef3cf843f2e1552f61e2ead3edfe3340c90fb","source":{"kind":"arxiv","id":"1908.09007","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.09007","created_at":"2026-07-04T23:59:35Z"},{"alias_kind":"arxiv_version","alias_value":"1908.09007v1","created_at":"2026-07-04T23:59:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.09007","created_at":"2026-07-04T23:59:35Z"},{"alias_kind":"pith_short_12","alias_value":"5FUV3Z3JNZK2","created_at":"2026-07-04T23:59:35Z"},{"alias_kind":"pith_short_16","alias_value":"5FUV3Z3JNZK2RWFN","created_at":"2026-07-04T23:59:35Z"},{"alias_kind":"pith_short_8","alias_value":"5FUV3Z3J","created_at":"2026-07-04T23:59:35Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:5FUV3Z3JNZK2RWFNBF5ECTXTZ6","target":"record","payload":{"canonical_record":{"source":{"id":"1908.09007","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2019-08-16T12:05:14Z","cross_cats_sorted":["cs.LG"],"title_canon_sha256":"afdffbc03789e9bf1f71146585dad4305dc04c51dd6d79fe67e144fa065540bf","abstract_canon_sha256":"5544078c2d56bc9f418d2f8e1647999f40cbff2bae017dd91573d31c85e6de80"},"schema_version":"1.0"},"canonical_sha256":"e9695de7696e55a8d8ad097a414ef3cf843f2e1552f61e2ead3edfe3340c90fb","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T23:59:35.908543Z","signature_b64":"vPNI1GInXrFRPy109nhoHfnsY1aSW8ug4VX+ryNc3ti6X1LMHQLXbnuGX9GEJyUjxNe3Tn70bG6t0xcpPOOwAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e9695de7696e55a8d8ad097a414ef3cf843f2e1552f61e2ead3edfe3340c90fb","last_reissued_at":"2026-07-04T23:59:35.908083Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T23:59:35.908083Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1908.09007","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":"2026-07-04T23:59:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"o3zNmnOze01GoujQrBqbez7MVvKcE117M+kjMpUdJfn6MGR5wDpcud6IucPTG6fVJ2fALXgoV+5mRcCxn6CAAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T22:21:44.565576Z"},"content_sha256":"ce399674273d2b46e4738eed4575245008eef1970dfb33793cd3108457cb36d5","schema_version":"1.0","event_id":"sha256:ce399674273d2b46e4738eed4575245008eef1970dfb33793cd3108457cb36d5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:5FUV3Z3JNZK2RWFNBF5ECTXTZ6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Comparative Study of Filtering Approaches Applied to Color Archival Document Images","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.LG"],"primary_cat":"cs.CV","authors_text":"Maroua Mehri, Mohamed Ali Mahjoub, Walid Elhedda","submitted_at":"2019-08-16T12:05:14Z","abstract_excerpt":"Current systems used by the Tunisian national archives for the automatic transcription of archival documents are hindered by many issues related to the performance of the optical character recognition (OCR) tools. Indeed, using a classical OCR system to transcribe and index ancient Arabic documents is not a straightforward task due to the idiosyncrasies of this category of documents, such as noise and degradation. Thus, applying an enhancement method or a denoising technique remains an essential prerequisite step to ease the archival document image analysis task. The state-of-the-art methods a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.09007","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1908.09007/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-04T23:59:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"shWVb0x6XRXS/X1NSUcOfc1chbm7sLBJbx7kOVECc9R0oNBzFe8LQ/1gm8FKJK3TZxNc+nL6HJcPkhYck9hIBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T22:21:44.566090Z"},"content_sha256":"04625346054c7902e5b3c29056558cf8fd1c989caf220950f799310d04f20186","schema_version":"1.0","event_id":"sha256:04625346054c7902e5b3c29056558cf8fd1c989caf220950f799310d04f20186"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5FUV3Z3JNZK2RWFNBF5ECTXTZ6/bundle.json","state_url":"https://pith.science/pith/5FUV3Z3JNZK2RWFNBF5ECTXTZ6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5FUV3Z3JNZK2RWFNBF5ECTXTZ6/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":"2026-08-16T22:21:44Z","links":{"resolver":"https://pith.science/pith/5FUV3Z3JNZK2RWFNBF5ECTXTZ6","bundle":"https://pith.science/pith/5FUV3Z3JNZK2RWFNBF5ECTXTZ6/bundle.json","state":"https://pith.science/pith/5FUV3Z3JNZK2RWFNBF5ECTXTZ6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5FUV3Z3JNZK2RWFNBF5ECTXTZ6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:5FUV3Z3JNZK2RWFNBF5ECTXTZ6","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":"5544078c2d56bc9f418d2f8e1647999f40cbff2bae017dd91573d31c85e6de80","cross_cats_sorted":["cs.LG"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2019-08-16T12:05:14Z","title_canon_sha256":"afdffbc03789e9bf1f71146585dad4305dc04c51dd6d79fe67e144fa065540bf"},"schema_version":"1.0","source":{"id":"1908.09007","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.09007","created_at":"2026-07-04T23:59:35Z"},{"alias_kind":"arxiv_version","alias_value":"1908.09007v1","created_at":"2026-07-04T23:59:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.09007","created_at":"2026-07-04T23:59:35Z"},{"alias_kind":"pith_short_12","alias_value":"5FUV3Z3JNZK2","created_at":"2026-07-04T23:59:35Z"},{"alias_kind":"pith_short_16","alias_value":"5FUV3Z3JNZK2RWFN","created_at":"2026-07-04T23:59:35Z"},{"alias_kind":"pith_short_8","alias_value":"5FUV3Z3J","created_at":"2026-07-04T23:59:35Z"}],"graph_snapshots":[{"event_id":"sha256:04625346054c7902e5b3c29056558cf8fd1c989caf220950f799310d04f20186","target":"graph","created_at":"2026-07-04T23:59:35Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1908.09007/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Current systems used by the Tunisian national archives for the automatic transcription of archival documents are hindered by many issues related to the performance of the optical character recognition (OCR) tools. Indeed, using a classical OCR system to transcribe and index ancient Arabic documents is not a straightforward task due to the idiosyncrasies of this category of documents, such as noise and degradation. Thus, applying an enhancement method or a denoising technique remains an essential prerequisite step to ease the archival document image analysis task. The state-of-the-art methods a","authors_text":"Maroua Mehri, Mohamed Ali Mahjoub, Walid Elhedda","cross_cats":["cs.LG"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2019-08-16T12:05:14Z","title":"A Comparative Study of Filtering Approaches Applied to Color Archival Document Images"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.09007","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:ce399674273d2b46e4738eed4575245008eef1970dfb33793cd3108457cb36d5","target":"record","created_at":"2026-07-04T23:59:35Z","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":"5544078c2d56bc9f418d2f8e1647999f40cbff2bae017dd91573d31c85e6de80","cross_cats_sorted":["cs.LG"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2019-08-16T12:05:14Z","title_canon_sha256":"afdffbc03789e9bf1f71146585dad4305dc04c51dd6d79fe67e144fa065540bf"},"schema_version":"1.0","source":{"id":"1908.09007","kind":"arxiv","version":1}},"canonical_sha256":"e9695de7696e55a8d8ad097a414ef3cf843f2e1552f61e2ead3edfe3340c90fb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e9695de7696e55a8d8ad097a414ef3cf843f2e1552f61e2ead3edfe3340c90fb","first_computed_at":"2026-07-04T23:59:35.908083Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T23:59:35.908083Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"vPNI1GInXrFRPy109nhoHfnsY1aSW8ug4VX+ryNc3ti6X1LMHQLXbnuGX9GEJyUjxNe3Tn70bG6t0xcpPOOwAw==","signature_status":"signed_v1","signed_at":"2026-07-04T23:59:35.908543Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.09007","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ce399674273d2b46e4738eed4575245008eef1970dfb33793cd3108457cb36d5","sha256:04625346054c7902e5b3c29056558cf8fd1c989caf220950f799310d04f20186"],"state_sha256":"40165a5bbb822f2ae254940943f0f16ce8c70f4a9a07af4f996b69edf084d7be"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AyE1G3GI7iSdSk7XbD1WcGwEOE1q2ygzUSHsUv21zTAtaVFnoJTlRNnmM6sAcvwrEUW4VBdGGidM/xaZm/+9DA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T22:21:44.569290Z","bundle_sha256":"9366f3c7caa75b8e7b812726ad8c468bce48b67c404db975b8fe7b05b7441dcd"}}