{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:6XPIJUH44GGCVF4XHPGDXLRF4W","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":"2bcf06225109cfd0298d5d6773cef87a54093dd0fbb95dd9c850e630fabdc144","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2016-12-21T23:09:01Z","title_canon_sha256":"374f6475e9acf54e75f977b069f262134b17fe330830fe2514b8855ece9d17a8"},"schema_version":"1.0","source":{"id":"1612.07379","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1612.07379","created_at":"2026-05-18T00:32:20Z"},{"alias_kind":"arxiv_version","alias_value":"1612.07379v2","created_at":"2026-05-18T00:32:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1612.07379","created_at":"2026-05-18T00:32:20Z"},{"alias_kind":"pith_short_12","alias_value":"6XPIJUH44GGC","created_at":"2026-05-18T12:30:04Z"},{"alias_kind":"pith_short_16","alias_value":"6XPIJUH44GGCVF4X","created_at":"2026-05-18T12:30:04Z"},{"alias_kind":"pith_short_8","alias_value":"6XPIJUH4","created_at":"2026-05-18T12:30:04Z"}],"graph_snapshots":[{"event_id":"sha256:2ef05599243839f538ed9c9cf9c88bcfbf9c7938eddda2fdbd7acf9b34e24ea1","target":"graph","created_at":"2026-05-18T00:32:20Z","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":"Microalgae counting is used to measure biomass quantity. Usually, it is performed in a manual way using a Neubauer chamber and expert criterion, with the risk of a high error rate. This paper addresses the methodology for automatic identification of Scenedesmus microalgae (used in the methane production and food industry) and applies it to images captured by a digital microscope. The use of contrast adaptive histogram equalization for pre-processing, and active contours for segmentation are presented. The calculation of statistical features (Histogram of Oriented Gradients, Hu and Zernike mome","authors_text":"Alexander Gomez, Augusto Salazar, Geman Diez, Jesus Francisco Vargas Bonilla, Jhony-Heriberto Giraldo-Zuluaga, Mariana Pe\\~nuela Vasquez, Tatiana Martinez","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2016-12-21T23:09:01Z","title":"Automatic Identification of Scenedesmus Polymorphic Microalgae from Microscopic Images"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1612.07379","kind":"arxiv","version":2},"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":"sha256:914649aff95de129861e59687377f959d86152dbb96b773858baf56e71396736","target":"record","created_at":"2026-05-18T00:32:20Z","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":"2bcf06225109cfd0298d5d6773cef87a54093dd0fbb95dd9c850e630fabdc144","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2016-12-21T23:09:01Z","title_canon_sha256":"374f6475e9acf54e75f977b069f262134b17fe330830fe2514b8855ece9d17a8"},"schema_version":"1.0","source":{"id":"1612.07379","kind":"arxiv","version":2}},"canonical_sha256":"f5de84d0fce18c2a97973bcc3bae25e5a0d71f3aa03ac3202fb8f6e61ffde3be","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f5de84d0fce18c2a97973bcc3bae25e5a0d71f3aa03ac3202fb8f6e61ffde3be","first_computed_at":"2026-05-18T00:32:20.971611Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:32:20.971611Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"murVEOZV1dAIYk0SDx9oBvjG2pFAYTkZ52aTuEUXDx41dyl+/+e2sUzkygi5BsneN53u2BCd09x6kIbggMU5DA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:32:20.972250Z","signed_message":"canonical_sha256_bytes"},"source_id":"1612.07379","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:914649aff95de129861e59687377f959d86152dbb96b773858baf56e71396736","sha256:2ef05599243839f538ed9c9cf9c88bcfbf9c7938eddda2fdbd7acf9b34e24ea1"],"state_sha256":"fa3800f851b434e6519bd651b62e91804dabbbcfcb42eeac5da8bfe35a8c2679"}