{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:PPCJTI56UUFRRCBQRYE2VUQCMF","short_pith_number":"pith:PPCJTI56","canonical_record":{"source":{"id":"1505.07672","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2015-05-28T12:37:15Z","cross_cats_sorted":[],"title_canon_sha256":"2206e5b18e37ca87e07543243b1d6bfd82f191b849311e580c3260ce664cb81d","abstract_canon_sha256":"921b4e3e2828b2621c89f332f2b20b056c22dbe79f709eb398667cb70c516f86"},"schema_version":"1.0"},"canonical_sha256":"7bc499a3bea50b1888308e09aad20261696ae91c1d358d2075ef576816196102","source":{"kind":"arxiv","id":"1505.07672","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1505.07672","created_at":"2026-05-18T02:00:56Z"},{"alias_kind":"arxiv_version","alias_value":"1505.07672v1","created_at":"2026-05-18T02:00:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1505.07672","created_at":"2026-05-18T02:00:56Z"},{"alias_kind":"pith_short_12","alias_value":"PPCJTI56UUFR","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_16","alias_value":"PPCJTI56UUFRRCBQ","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_8","alias_value":"PPCJTI56","created_at":"2026-05-18T12:29:37Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:PPCJTI56UUFRRCBQRYE2VUQCMF","target":"record","payload":{"canonical_record":{"source":{"id":"1505.07672","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2015-05-28T12:37:15Z","cross_cats_sorted":[],"title_canon_sha256":"2206e5b18e37ca87e07543243b1d6bfd82f191b849311e580c3260ce664cb81d","abstract_canon_sha256":"921b4e3e2828b2621c89f332f2b20b056c22dbe79f709eb398667cb70c516f86"},"schema_version":"1.0"},"canonical_sha256":"7bc499a3bea50b1888308e09aad20261696ae91c1d358d2075ef576816196102","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:00:56.179924Z","signature_b64":"hm87PqVROOtOFKKJWXA3HYYhpZEXpUZ9IV9Jk8VWHuijjEtqK8U48paI1EL01fFq2AqSsmFQ9wdJdOuMT13BCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7bc499a3bea50b1888308e09aad20261696ae91c1d358d2075ef576816196102","last_reissued_at":"2026-05-18T02:00:56.179194Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:00:56.179194Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1505.07672","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":"2026-05-18T02:00:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BljpPPRrMuwuzPJB2AePjNZMNokZzFcMt+uKt/sCNQ1dzH1yO9kNUmAnl2QRDx6loxe4LQ+pkbLm5NeKs3PMBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-24T18:09:43.092939Z"},"content_sha256":"fe02d8bd832c948d451199f6b2c3ef39120f72fcca9427c7aaa0422324d94802","schema_version":"1.0","event_id":"sha256:fe02d8bd832c948d451199f6b2c3ef39120f72fcca9427c7aaa0422324d94802"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:PPCJTI56UUFRRCBQRYE2VUQCMF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Generative Model of Natural Texture Surrogates","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.CV","authors_text":"Debapriya Das, Lucas Theis, Matthias Bethge, Niklas Ludtke","submitted_at":"2015-05-28T12:37:15Z","abstract_excerpt":"Natural images can be viewed as patchworks of different textures, where the local image statistics is roughly stationary within a small neighborhood but otherwise varies from region to region. In order to model this variability, we first applied the parametric texture algorithm of Portilla and Simoncelli to image patches of 64X64 pixels in a large database of natural images such that each image patch is then described by 655 texture parameters which specify certain statistics, such as variances and covariances of wavelet coefficients or coefficient magnitudes within that patch.\n  To model the "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.07672","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":"2026-05-18T02:00:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"x80RQZwuyxvvtuKQ2t27V0Y1kQBz6fyQzaYjXeX0WGr9GWquxVYG7UyK3kBQfs/TNxcZv73TpSrtOCu4q4OSAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-24T18:09:43.093273Z"},"content_sha256":"6c3e2f9f065888d035ed6e25f620bdc9646fae96191f660405a347f7303f9746","schema_version":"1.0","event_id":"sha256:6c3e2f9f065888d035ed6e25f620bdc9646fae96191f660405a347f7303f9746"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PPCJTI56UUFRRCBQRYE2VUQCMF/bundle.json","state_url":"https://pith.science/pith/PPCJTI56UUFRRCBQRYE2VUQCMF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PPCJTI56UUFRRCBQRYE2VUQCMF/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":"2026-06-24T18:09:43Z","links":{"resolver":"https://pith.science/pith/PPCJTI56UUFRRCBQRYE2VUQCMF","bundle":"https://pith.science/pith/PPCJTI56UUFRRCBQRYE2VUQCMF/bundle.json","state":"https://pith.science/pith/PPCJTI56UUFRRCBQRYE2VUQCMF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PPCJTI56UUFRRCBQRYE2VUQCMF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:PPCJTI56UUFRRCBQRYE2VUQCMF","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":"921b4e3e2828b2621c89f332f2b20b056c22dbe79f709eb398667cb70c516f86","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2015-05-28T12:37:15Z","title_canon_sha256":"2206e5b18e37ca87e07543243b1d6bfd82f191b849311e580c3260ce664cb81d"},"schema_version":"1.0","source":{"id":"1505.07672","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1505.07672","created_at":"2026-05-18T02:00:56Z"},{"alias_kind":"arxiv_version","alias_value":"1505.07672v1","created_at":"2026-05-18T02:00:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1505.07672","created_at":"2026-05-18T02:00:56Z"},{"alias_kind":"pith_short_12","alias_value":"PPCJTI56UUFR","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_16","alias_value":"PPCJTI56UUFRRCBQ","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_8","alias_value":"PPCJTI56","created_at":"2026-05-18T12:29:37Z"}],"graph_snapshots":[{"event_id":"sha256:6c3e2f9f065888d035ed6e25f620bdc9646fae96191f660405a347f7303f9746","target":"graph","created_at":"2026-05-18T02:00:56Z","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":"Natural images can be viewed as patchworks of different textures, where the local image statistics is roughly stationary within a small neighborhood but otherwise varies from region to region. In order to model this variability, we first applied the parametric texture algorithm of Portilla and Simoncelli to image patches of 64X64 pixels in a large database of natural images such that each image patch is then described by 655 texture parameters which specify certain statistics, such as variances and covariances of wavelet coefficients or coefficient magnitudes within that patch.\n  To model the ","authors_text":"Debapriya Das, Lucas Theis, Matthias Bethge, Niklas Ludtke","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2015-05-28T12:37:15Z","title":"A Generative Model of Natural Texture Surrogates"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.07672","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:fe02d8bd832c948d451199f6b2c3ef39120f72fcca9427c7aaa0422324d94802","target":"record","created_at":"2026-05-18T02:00:56Z","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":"921b4e3e2828b2621c89f332f2b20b056c22dbe79f709eb398667cb70c516f86","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2015-05-28T12:37:15Z","title_canon_sha256":"2206e5b18e37ca87e07543243b1d6bfd82f191b849311e580c3260ce664cb81d"},"schema_version":"1.0","source":{"id":"1505.07672","kind":"arxiv","version":1}},"canonical_sha256":"7bc499a3bea50b1888308e09aad20261696ae91c1d358d2075ef576816196102","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7bc499a3bea50b1888308e09aad20261696ae91c1d358d2075ef576816196102","first_computed_at":"2026-05-18T02:00:56.179194Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:00:56.179194Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"hm87PqVROOtOFKKJWXA3HYYhpZEXpUZ9IV9Jk8VWHuijjEtqK8U48paI1EL01fFq2AqSsmFQ9wdJdOuMT13BCg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:00:56.179924Z","signed_message":"canonical_sha256_bytes"},"source_id":"1505.07672","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fe02d8bd832c948d451199f6b2c3ef39120f72fcca9427c7aaa0422324d94802","sha256:6c3e2f9f065888d035ed6e25f620bdc9646fae96191f660405a347f7303f9746"],"state_sha256":"ace2aa972847a23884aaa4bf010d8b16f46d84a39bac9ef657b6e2ccc6465589"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rkffj2Gy3H0c1qdylbhglUIL9yIyVYwBBGzqarVxcbM8xC+YJyy5wO0oiuEKHTfUXC2s3nTr0x3x0X4ZC9p1Cg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-24T18:09:43.095284Z","bundle_sha256":"d105cbef3a0325ccddecbb341af9c894cf8445694da5ca674197c6f43c261d8e"}}