{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:2JB4LGFFY2A2SDZO6IYMTLIIPL","short_pith_number":"pith:2JB4LGFF","canonical_record":{"source":{"id":"1908.07932","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/publicdomain/zero/1.0/","primary_cat":"physics.pop-ph","submitted_at":"2019-08-08T02:23:55Z","cross_cats_sorted":["physics.ed-ph"],"title_canon_sha256":"1aa0b9558148b31372da4ddc971ef155639adf1bf67cd7951bafdccd381e8c3b","abstract_canon_sha256":"601acae206aa03515b173618794f1defeab9b017843509797a48b9fb5baf08ca"},"schema_version":"1.0"},"canonical_sha256":"d243c598a5c681a90f2ef230c9ad087aed25825e15d69b1b8e551cffc3fc0cdc","source":{"kind":"arxiv","id":"1908.07932","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.07932","created_at":"2026-07-04T23:59:02Z"},{"alias_kind":"arxiv_version","alias_value":"1908.07932v1","created_at":"2026-07-04T23:59:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.07932","created_at":"2026-07-04T23:59:02Z"},{"alias_kind":"pith_short_12","alias_value":"2JB4LGFFY2A2","created_at":"2026-07-04T23:59:02Z"},{"alias_kind":"pith_short_16","alias_value":"2JB4LGFFY2A2SDZO","created_at":"2026-07-04T23:59:02Z"},{"alias_kind":"pith_short_8","alias_value":"2JB4LGFF","created_at":"2026-07-04T23:59:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:2JB4LGFFY2A2SDZO6IYMTLIIPL","target":"record","payload":{"canonical_record":{"source":{"id":"1908.07932","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/publicdomain/zero/1.0/","primary_cat":"physics.pop-ph","submitted_at":"2019-08-08T02:23:55Z","cross_cats_sorted":["physics.ed-ph"],"title_canon_sha256":"1aa0b9558148b31372da4ddc971ef155639adf1bf67cd7951bafdccd381e8c3b","abstract_canon_sha256":"601acae206aa03515b173618794f1defeab9b017843509797a48b9fb5baf08ca"},"schema_version":"1.0"},"canonical_sha256":"d243c598a5c681a90f2ef230c9ad087aed25825e15d69b1b8e551cffc3fc0cdc","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T23:59:02.602309Z","signature_b64":"8XhxAYCsaNJuQjtbX1IANd22DzzxEW5MyJgGn/5PDQKTMoPYdphCo6W/Lt0zrQXvEucUGdnzZjFdNG0bZ5ulCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d243c598a5c681a90f2ef230c9ad087aed25825e15d69b1b8e551cffc3fc0cdc","last_reissued_at":"2026-07-04T23:59:02.601851Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T23:59:02.601851Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1908.07932","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":"2026-07-04T23:59:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XIGJk/wJ3XHsJn1uK6vrluEXO4/TSt9L2GKSZovZl2uCyxN72CRSZ0OUM0FTJipeZUWtqZQ1GooQBH78wIR4Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T04:40:23.122679Z"},"content_sha256":"1e84498046fce6683d5d371131e9fb7d7c4cec2b92564442616ba9977a5e2cf9","schema_version":"1.0","event_id":"sha256:1e84498046fce6683d5d371131e9fb7d7c4cec2b92564442616ba9977a5e2cf9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:2JB4LGFFY2A2SDZO6IYMTLIIPL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Detection of symmetry using a crystallographic image processing algorithm","license":"http://creativecommons.org/publicdomain/zero/1.0/","headline":"","cross_cats":["physics.ed-ph"],"primary_cat":"physics.pop-ph","authors_text":"Paul Plachinda","submitted_at":"2019-08-08T02:23:55Z","abstract_excerpt":"This article presents an automated method to quantify and detect symmetry elements in 2D patterns by means of image processing. Escher's woodcuts, a widely recognized didactic tool for crystallographic education of students, were used to demonstrate this approach. We also discuss peculiarities in the detection of black and white symmetry, color symmetry, and detection of the \"hidden\" and \"broken\" symmetry elements by means of the phase origin map approach."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.07932","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/1908.07932/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":"2026-07-04T23:59:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oGHnVNUIbwOE7ybx8fe9gCYKQhJnJJU5WHlU9nemGrzjwphL4cOfVZGTsyOeHVcpDW5Oui4q+4TNxJTiNWquAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T04:40:23.123207Z"},"content_sha256":"00fd655ee15ba6701cb201135904281e98bfeac0131b43d3c4f9d83b49964a1b","schema_version":"1.0","event_id":"sha256:00fd655ee15ba6701cb201135904281e98bfeac0131b43d3c4f9d83b49964a1b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2JB4LGFFY2A2SDZO6IYMTLIIPL/bundle.json","state_url":"https://pith.science/pith/2JB4LGFFY2A2SDZO6IYMTLIIPL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2JB4LGFFY2A2SDZO6IYMTLIIPL/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":"2026-08-16T04:40:23Z","links":{"resolver":"https://pith.science/pith/2JB4LGFFY2A2SDZO6IYMTLIIPL","bundle":"https://pith.science/pith/2JB4LGFFY2A2SDZO6IYMTLIIPL/bundle.json","state":"https://pith.science/pith/2JB4LGFFY2A2SDZO6IYMTLIIPL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2JB4LGFFY2A2SDZO6IYMTLIIPL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:2JB4LGFFY2A2SDZO6IYMTLIIPL","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":"601acae206aa03515b173618794f1defeab9b017843509797a48b9fb5baf08ca","cross_cats_sorted":["physics.ed-ph"],"license":"http://creativecommons.org/publicdomain/zero/1.0/","primary_cat":"physics.pop-ph","submitted_at":"2019-08-08T02:23:55Z","title_canon_sha256":"1aa0b9558148b31372da4ddc971ef155639adf1bf67cd7951bafdccd381e8c3b"},"schema_version":"1.0","source":{"id":"1908.07932","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.07932","created_at":"2026-07-04T23:59:02Z"},{"alias_kind":"arxiv_version","alias_value":"1908.07932v1","created_at":"2026-07-04T23:59:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.07932","created_at":"2026-07-04T23:59:02Z"},{"alias_kind":"pith_short_12","alias_value":"2JB4LGFFY2A2","created_at":"2026-07-04T23:59:02Z"},{"alias_kind":"pith_short_16","alias_value":"2JB4LGFFY2A2SDZO","created_at":"2026-07-04T23:59:02Z"},{"alias_kind":"pith_short_8","alias_value":"2JB4LGFF","created_at":"2026-07-04T23:59:02Z"}],"graph_snapshots":[{"event_id":"sha256:00fd655ee15ba6701cb201135904281e98bfeac0131b43d3c4f9d83b49964a1b","target":"graph","created_at":"2026-07-04T23:59:02Z","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/1908.07932/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"This article presents an automated method to quantify and detect symmetry elements in 2D patterns by means of image processing. Escher's woodcuts, a widely recognized didactic tool for crystallographic education of students, were used to demonstrate this approach. We also discuss peculiarities in the detection of black and white symmetry, color symmetry, and detection of the \"hidden\" and \"broken\" symmetry elements by means of the phase origin map approach.","authors_text":"Paul Plachinda","cross_cats":["physics.ed-ph"],"headline":"","license":"http://creativecommons.org/publicdomain/zero/1.0/","primary_cat":"physics.pop-ph","submitted_at":"2019-08-08T02:23:55Z","title":"Detection of symmetry using a crystallographic image processing algorithm"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.07932","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":"sha256:1e84498046fce6683d5d371131e9fb7d7c4cec2b92564442616ba9977a5e2cf9","target":"record","created_at":"2026-07-04T23:59:02Z","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":"601acae206aa03515b173618794f1defeab9b017843509797a48b9fb5baf08ca","cross_cats_sorted":["physics.ed-ph"],"license":"http://creativecommons.org/publicdomain/zero/1.0/","primary_cat":"physics.pop-ph","submitted_at":"2019-08-08T02:23:55Z","title_canon_sha256":"1aa0b9558148b31372da4ddc971ef155639adf1bf67cd7951bafdccd381e8c3b"},"schema_version":"1.0","source":{"id":"1908.07932","kind":"arxiv","version":1}},"canonical_sha256":"d243c598a5c681a90f2ef230c9ad087aed25825e15d69b1b8e551cffc3fc0cdc","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d243c598a5c681a90f2ef230c9ad087aed25825e15d69b1b8e551cffc3fc0cdc","first_computed_at":"2026-07-04T23:59:02.601851Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T23:59:02.601851Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8XhxAYCsaNJuQjtbX1IANd22DzzxEW5MyJgGn/5PDQKTMoPYdphCo6W/Lt0zrQXvEucUGdnzZjFdNG0bZ5ulCQ==","signature_status":"signed_v1","signed_at":"2026-07-04T23:59:02.602309Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.07932","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1e84498046fce6683d5d371131e9fb7d7c4cec2b92564442616ba9977a5e2cf9","sha256:00fd655ee15ba6701cb201135904281e98bfeac0131b43d3c4f9d83b49964a1b"],"state_sha256":"739a94116aedbdb77a7bdcb946b6adb1bcfc2b62d16005b6c061de2952b4fcc9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UfozUotI7mnOEupHWgE1B4WRmVZbESYCjbWpU2RS0czKHir2ZI3SQ84nsVQp1CBOCaSnKrrjGhg0tUoM0oy6DQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T04:40:23.127963Z","bundle_sha256":"fca61d3416ada86aadcf462181273afd861e6934b6dfb7a54a61faeb67ec1920"}}