{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:YHKOT65MSX2CG774UCNLGB672L","short_pith_number":"pith:YHKOT65M","canonical_record":{"source":{"id":"1606.06314","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2016-06-20T20:15:34Z","cross_cats_sorted":[],"title_canon_sha256":"1867a910d96a43970621036ebd383ded651a6575a1b17e7ea4cbf74622df0127","abstract_canon_sha256":"5689888ca83dbc961357189d1e33e8f81df668ce9a60b11517f91f8fabcbf04b"},"schema_version":"1.0"},"canonical_sha256":"c1d4e9fbac95f4237ffca09ab307dfd2d1f004e7e4455018072da00c88b100c0","source":{"kind":"arxiv","id":"1606.06314","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1606.06314","created_at":"2026-05-18T00:49:42Z"},{"alias_kind":"arxiv_version","alias_value":"1606.06314v3","created_at":"2026-05-18T00:49:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1606.06314","created_at":"2026-05-18T00:49:42Z"},{"alias_kind":"pith_short_12","alias_value":"YHKOT65MSX2C","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_16","alias_value":"YHKOT65MSX2CG774","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_8","alias_value":"YHKOT65M","created_at":"2026-05-18T12:30:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:YHKOT65MSX2CG774UCNLGB672L","target":"record","payload":{"canonical_record":{"source":{"id":"1606.06314","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2016-06-20T20:15:34Z","cross_cats_sorted":[],"title_canon_sha256":"1867a910d96a43970621036ebd383ded651a6575a1b17e7ea4cbf74622df0127","abstract_canon_sha256":"5689888ca83dbc961357189d1e33e8f81df668ce9a60b11517f91f8fabcbf04b"},"schema_version":"1.0"},"canonical_sha256":"c1d4e9fbac95f4237ffca09ab307dfd2d1f004e7e4455018072da00c88b100c0","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:49:42.319327Z","signature_b64":"o8YbmWPXU1g05N+wEkVdFtrDTAXPpLMWeHd5w//XVv9pWk3HSEgnVG3sQHAnzRSgfl2IpcxEbu51Slse396ZAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c1d4e9fbac95f4237ffca09ab307dfd2d1f004e7e4455018072da00c88b100c0","last_reissued_at":"2026-05-18T00:49:42.318861Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:49:42.318861Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1606.06314","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:49:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YZ76x31aPAUXwtjrqVeN8OuqugnXNdtUJpmENDf98BKRqaFJRfhU2tMgv9YgaCw2MhnhxVr7A+OnDdc6Vv9zBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T23:08:03.336954Z"},"content_sha256":"cac385dea07f6edf6b2bcd773b79f936a4171eaad0966bdef86216ac1b3e1058","schema_version":"1.0","event_id":"sha256:cac385dea07f6edf6b2bcd773b79f936a4171eaad0966bdef86216ac1b3e1058"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:YHKOT65MSX2CG774UCNLGB672L","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Multiple Hypothesis Colorization","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.CV","authors_text":"Lorenzo Torresani, Mohammad Haris Baig","submitted_at":"2016-06-20T20:15:34Z","abstract_excerpt":"In this work we focus on the problem of colorization for image compression. Since color information occupies a large proportion of the total storage size of an image, a method that can predict accurate color from its grayscale version can produce dramatic reduction in image file size. But colorization for compression poses several challenges. First, while colorization for artistic purposes simply involves predicting plausible chroma, colorization for compression requires generating output colors that are as close as possible to the ground truth. Second, many objects in the real world exhibit m"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1606.06314","kind":"arxiv","version":3},"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":"2026-05-18T00:49:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RhCt9/nGKqDn1QxzBL/UCyTGeOcGpafEGzc6KccAuIf4P2E2rYpFSagEeh0eM1L8/+UuPxmi3+w4jaw9+9HCAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T23:08:03.337291Z"},"content_sha256":"7101ec9db04a514a9fd5a230092c6f86156db092fd8f12fd861148a8c548af17","schema_version":"1.0","event_id":"sha256:7101ec9db04a514a9fd5a230092c6f86156db092fd8f12fd861148a8c548af17"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YHKOT65MSX2CG774UCNLGB672L/bundle.json","state_url":"https://pith.science/pith/YHKOT65MSX2CG774UCNLGB672L/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YHKOT65MSX2CG774UCNLGB672L/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":"2026-06-02T23:08:03Z","links":{"resolver":"https://pith.science/pith/YHKOT65MSX2CG774UCNLGB672L","bundle":"https://pith.science/pith/YHKOT65MSX2CG774UCNLGB672L/bundle.json","state":"https://pith.science/pith/YHKOT65MSX2CG774UCNLGB672L/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YHKOT65MSX2CG774UCNLGB672L/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:YHKOT65MSX2CG774UCNLGB672L","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":"5689888ca83dbc961357189d1e33e8f81df668ce9a60b11517f91f8fabcbf04b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2016-06-20T20:15:34Z","title_canon_sha256":"1867a910d96a43970621036ebd383ded651a6575a1b17e7ea4cbf74622df0127"},"schema_version":"1.0","source":{"id":"1606.06314","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1606.06314","created_at":"2026-05-18T00:49:42Z"},{"alias_kind":"arxiv_version","alias_value":"1606.06314v3","created_at":"2026-05-18T00:49:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1606.06314","created_at":"2026-05-18T00:49:42Z"},{"alias_kind":"pith_short_12","alias_value":"YHKOT65MSX2C","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_16","alias_value":"YHKOT65MSX2CG774","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_8","alias_value":"YHKOT65M","created_at":"2026-05-18T12:30:53Z"}],"graph_snapshots":[{"event_id":"sha256:7101ec9db04a514a9fd5a230092c6f86156db092fd8f12fd861148a8c548af17","target":"graph","created_at":"2026-05-18T00:49:42Z","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":"In this work we focus on the problem of colorization for image compression. Since color information occupies a large proportion of the total storage size of an image, a method that can predict accurate color from its grayscale version can produce dramatic reduction in image file size. But colorization for compression poses several challenges. First, while colorization for artistic purposes simply involves predicting plausible chroma, colorization for compression requires generating output colors that are as close as possible to the ground truth. Second, many objects in the real world exhibit m","authors_text":"Lorenzo Torresani, Mohammad Haris Baig","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2016-06-20T20:15:34Z","title":"Multiple Hypothesis Colorization"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1606.06314","kind":"arxiv","version":3},"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:cac385dea07f6edf6b2bcd773b79f936a4171eaad0966bdef86216ac1b3e1058","target":"record","created_at":"2026-05-18T00:49:42Z","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":"5689888ca83dbc961357189d1e33e8f81df668ce9a60b11517f91f8fabcbf04b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2016-06-20T20:15:34Z","title_canon_sha256":"1867a910d96a43970621036ebd383ded651a6575a1b17e7ea4cbf74622df0127"},"schema_version":"1.0","source":{"id":"1606.06314","kind":"arxiv","version":3}},"canonical_sha256":"c1d4e9fbac95f4237ffca09ab307dfd2d1f004e7e4455018072da00c88b100c0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c1d4e9fbac95f4237ffca09ab307dfd2d1f004e7e4455018072da00c88b100c0","first_computed_at":"2026-05-18T00:49:42.318861Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:49:42.318861Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"o8YbmWPXU1g05N+wEkVdFtrDTAXPpLMWeHd5w//XVv9pWk3HSEgnVG3sQHAnzRSgfl2IpcxEbu51Slse396ZAA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:49:42.319327Z","signed_message":"canonical_sha256_bytes"},"source_id":"1606.06314","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cac385dea07f6edf6b2bcd773b79f936a4171eaad0966bdef86216ac1b3e1058","sha256:7101ec9db04a514a9fd5a230092c6f86156db092fd8f12fd861148a8c548af17"],"state_sha256":"bfd7f25c3397c9823a52f552c5a7729d093cdee59ab60b8eef1e3a6739db80cf"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XeUzqkE3s0uMqUfgjJWioCUkA15UTz1FtFPKMLjdpXMYrzs9Qzt5TI29p5YwcHqElSExAlo60+VjwQRlV66NBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T23:08:03.339186Z","bundle_sha256":"efec0ad32b8888409529b1233da8930bb0f9ca1bec1ea30a16725e3efbffc0dc"}}