{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:HGKG6TXHUHXSR4QKIWPUQ7KFQQ","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":"24a4ef7727b302aa5b4b76ecd73839edffdb844dfb8ede0cde1dcb8d5dab81dd","cross_cats_sorted":["q-bio.NC"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.stat-mech","submitted_at":"2012-09-14T18:42:31Z","title_canon_sha256":"8951e64ace88c8072109ad74b9ee95edc8a1edf9b7cfe7045369f8f16f2ccdbb"},"schema_version":"1.0","source":{"id":"1209.3277","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1209.3277","created_at":"2026-05-18T03:38:32Z"},{"alias_kind":"arxiv_version","alias_value":"1209.3277v2","created_at":"2026-05-18T03:38:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1209.3277","created_at":"2026-05-18T03:38:32Z"},{"alias_kind":"pith_short_12","alias_value":"HGKG6TXHUHXS","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_16","alias_value":"HGKG6TXHUHXSR4QK","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_8","alias_value":"HGKG6TXH","created_at":"2026-05-18T12:27:09Z"}],"graph_snapshots":[{"event_id":"sha256:2db0a8aaa8bf17f0bc4a1e7bc0764f323ac57d2c12147004824010601fb8b0f5","target":"graph","created_at":"2026-05-18T03:38:32Z","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":"The opacity of typical objects in the world results in occlusion --- an important property of natural scenes that makes inference of the full 3-dimensional structure of the world challenging. The relationship between occlusion and low-level image statistics has been hotly debated in the literature, and extensive simulations have been used to determine whether occlusion is responsible for the ubiquitously observed power-law power spectra of natural images. To deepen our understanding of this problem, we have analytically computed the 2- and 4-point functions of a generalized \"dead leaves\" model","authors_text":"David Pfau, Joel Zylberberg, Michael Robert DeWeese","cross_cats":["q-bio.NC"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.stat-mech","submitted_at":"2012-09-14T18:42:31Z","title":"Dead leaves and the dirty ground: low-level image statistics in transmissive and occlusive imaging environments"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1209.3277","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:d1c2e0d1331f8ee04bec13ba2980b6fcb6f8644d92f7fe6f87dee68fc8a498b9","target":"record","created_at":"2026-05-18T03:38:32Z","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":"24a4ef7727b302aa5b4b76ecd73839edffdb844dfb8ede0cde1dcb8d5dab81dd","cross_cats_sorted":["q-bio.NC"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.stat-mech","submitted_at":"2012-09-14T18:42:31Z","title_canon_sha256":"8951e64ace88c8072109ad74b9ee95edc8a1edf9b7cfe7045369f8f16f2ccdbb"},"schema_version":"1.0","source":{"id":"1209.3277","kind":"arxiv","version":2}},"canonical_sha256":"39946f4ee7a1ef28f20a459f487d4584295993e29d1bae31a498fa18dfd60b90","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"39946f4ee7a1ef28f20a459f487d4584295993e29d1bae31a498fa18dfd60b90","first_computed_at":"2026-05-18T03:38:32.723964Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:38:32.723964Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Vkf1FI6ITl0Hw+buuio8ErEh5AxMGbFZATDPO6zaJS/e1KU9rRaXljjpXuiaWkQ9PJLB8GAFfeMiGd52gFKyBw==","signature_status":"signed_v1","signed_at":"2026-05-18T03:38:32.724498Z","signed_message":"canonical_sha256_bytes"},"source_id":"1209.3277","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d1c2e0d1331f8ee04bec13ba2980b6fcb6f8644d92f7fe6f87dee68fc8a498b9","sha256:2db0a8aaa8bf17f0bc4a1e7bc0764f323ac57d2c12147004824010601fb8b0f5"],"state_sha256":"2ea85a6003d8d6419ad49c3b2b06574cd25aea31f01156d9ebe35c26cf246d99"}