{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:VEKUBTMNL6UVLABKL5A2ZSYPY7","short_pith_number":"pith:VEKUBTMN","canonical_record":{"source":{"id":"2110.01805","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2021-10-05T03:38:43Z","cross_cats_sorted":["cs.CV"],"title_canon_sha256":"fbd03bab059f2367269e50635e767d04012b955ab2a6b7cc051fb06f7f09515e","abstract_canon_sha256":"4c562358c10e7ee1b7f55f2e78f22b0b684f3fa8bc02595a950c1a65c748567e"},"schema_version":"1.0"},"canonical_sha256":"a91540cd8d5fa955802a5f41accb0fc7f31529e5827866641c669d4a7dd89428","source":{"kind":"arxiv","id":"2110.01805","version":4},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2110.01805","created_at":"2026-07-05T05:22:04Z"},{"alias_kind":"arxiv_version","alias_value":"2110.01805v4","created_at":"2026-07-05T05:22:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2110.01805","created_at":"2026-07-05T05:22:04Z"},{"alias_kind":"pith_short_12","alias_value":"VEKUBTMNL6UV","created_at":"2026-07-05T05:22:04Z"},{"alias_kind":"pith_short_16","alias_value":"VEKUBTMNL6UVLABK","created_at":"2026-07-05T05:22:04Z"},{"alias_kind":"pith_short_8","alias_value":"VEKUBTMN","created_at":"2026-07-05T05:22:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:VEKUBTMNL6UVLABKL5A2ZSYPY7","target":"record","payload":{"canonical_record":{"source":{"id":"2110.01805","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2021-10-05T03:38:43Z","cross_cats_sorted":["cs.CV"],"title_canon_sha256":"fbd03bab059f2367269e50635e767d04012b955ab2a6b7cc051fb06f7f09515e","abstract_canon_sha256":"4c562358c10e7ee1b7f55f2e78f22b0b684f3fa8bc02595a950c1a65c748567e"},"schema_version":"1.0"},"canonical_sha256":"a91540cd8d5fa955802a5f41accb0fc7f31529e5827866641c669d4a7dd89428","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T05:22:04.628144Z","signature_b64":"wWf0CzmY2+mMZanVwSV3E9AM28LCQs1hqqJDB0kFFyVASUTMYJI2kVfWR0useW3yU44OLXwMv9VPwJwuHJ0tBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a91540cd8d5fa955802a5f41accb0fc7f31529e5827866641c669d4a7dd89428","last_reissued_at":"2026-07-05T05:22:04.627690Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T05:22:04.627690Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2110.01805","source_version":4,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T05:22:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nuD5ePLIoDXDqe0lTwdtO2i7P7L3yTLfwZuhQnsR2ci36bCw1XQlO9ogKH/DJsptR3wYpU8BZ38nWseQHLNaDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-17T12:19:54.983627Z"},"content_sha256":"cc2510921afcbff1a3cbc9102544c98c1da60957e21a71612760efaa595afc33","schema_version":"1.0","event_id":"sha256:cc2510921afcbff1a3cbc9102544c98c1da60957e21a71612760efaa595afc33"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:VEKUBTMNL6UVLABKL5A2ZSYPY7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Self-Supervised Learning of Perceptually Optimized Block Motion Estimates for Video Compression","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.CV"],"primary_cat":"eess.IV","authors_text":"Alan C. Bovik, Andrey Norkin, Somdyuti Paul","submitted_at":"2021-10-05T03:38:43Z","abstract_excerpt":"Block based motion estimation is integral to inter prediction processes performed in hybrid video codecs. Prevalent block matching based methods that are used to compute block motion vectors (MVs) rely on computationally intensive search procedures. They also suffer from the aperture problem, which can worsen as the block size is reduced. Moreover, the block matching criteria used in typical codecs do not account for the resulting levels of perceptual quality of the motion compensated pictures that are created upon decoding. Towards achieving the elusive goal of perceptually optimized motion e"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2110.01805","kind":"arxiv","version":4},"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/2110.01805/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":"2026-07-05T05:22:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0F81x0OsYwtBHhkep19PJ4Or3NncxPmVd1KdYxNTXC/vcVd0ai7+WjFTgpNsPt8mrhLe2TbmYgqzE/PbdGDaDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-17T12:19:54.984013Z"},"content_sha256":"efc4bd15b790eb7fc4015d16f7fd7c1a00bb627e25e66a8cc3f71258c7f06e2b","schema_version":"1.0","event_id":"sha256:efc4bd15b790eb7fc4015d16f7fd7c1a00bb627e25e66a8cc3f71258c7f06e2b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VEKUBTMNL6UVLABKL5A2ZSYPY7/bundle.json","state_url":"https://pith.science/pith/VEKUBTMNL6UVLABKL5A2ZSYPY7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VEKUBTMNL6UVLABKL5A2ZSYPY7/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":"2026-08-17T12:19:54Z","links":{"resolver":"https://pith.science/pith/VEKUBTMNL6UVLABKL5A2ZSYPY7","bundle":"https://pith.science/pith/VEKUBTMNL6UVLABKL5A2ZSYPY7/bundle.json","state":"https://pith.science/pith/VEKUBTMNL6UVLABKL5A2ZSYPY7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VEKUBTMNL6UVLABKL5A2ZSYPY7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:VEKUBTMNL6UVLABKL5A2ZSYPY7","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":"4c562358c10e7ee1b7f55f2e78f22b0b684f3fa8bc02595a950c1a65c748567e","cross_cats_sorted":["cs.CV"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2021-10-05T03:38:43Z","title_canon_sha256":"fbd03bab059f2367269e50635e767d04012b955ab2a6b7cc051fb06f7f09515e"},"schema_version":"1.0","source":{"id":"2110.01805","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2110.01805","created_at":"2026-07-05T05:22:04Z"},{"alias_kind":"arxiv_version","alias_value":"2110.01805v4","created_at":"2026-07-05T05:22:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2110.01805","created_at":"2026-07-05T05:22:04Z"},{"alias_kind":"pith_short_12","alias_value":"VEKUBTMNL6UV","created_at":"2026-07-05T05:22:04Z"},{"alias_kind":"pith_short_16","alias_value":"VEKUBTMNL6UVLABK","created_at":"2026-07-05T05:22:04Z"},{"alias_kind":"pith_short_8","alias_value":"VEKUBTMN","created_at":"2026-07-05T05:22:04Z"}],"graph_snapshots":[{"event_id":"sha256:efc4bd15b790eb7fc4015d16f7fd7c1a00bb627e25e66a8cc3f71258c7f06e2b","target":"graph","created_at":"2026-07-05T05:22:04Z","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/2110.01805/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Block based motion estimation is integral to inter prediction processes performed in hybrid video codecs. Prevalent block matching based methods that are used to compute block motion vectors (MVs) rely on computationally intensive search procedures. They also suffer from the aperture problem, which can worsen as the block size is reduced. Moreover, the block matching criteria used in typical codecs do not account for the resulting levels of perceptual quality of the motion compensated pictures that are created upon decoding. Towards achieving the elusive goal of perceptually optimized motion e","authors_text":"Alan C. Bovik, Andrey Norkin, Somdyuti Paul","cross_cats":["cs.CV"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2021-10-05T03:38:43Z","title":"Self-Supervised Learning of Perceptually Optimized Block Motion Estimates for Video Compression"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2110.01805","kind":"arxiv","version":4},"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:cc2510921afcbff1a3cbc9102544c98c1da60957e21a71612760efaa595afc33","target":"record","created_at":"2026-07-05T05:22:04Z","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":"4c562358c10e7ee1b7f55f2e78f22b0b684f3fa8bc02595a950c1a65c748567e","cross_cats_sorted":["cs.CV"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2021-10-05T03:38:43Z","title_canon_sha256":"fbd03bab059f2367269e50635e767d04012b955ab2a6b7cc051fb06f7f09515e"},"schema_version":"1.0","source":{"id":"2110.01805","kind":"arxiv","version":4}},"canonical_sha256":"a91540cd8d5fa955802a5f41accb0fc7f31529e5827866641c669d4a7dd89428","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a91540cd8d5fa955802a5f41accb0fc7f31529e5827866641c669d4a7dd89428","first_computed_at":"2026-07-05T05:22:04.627690Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T05:22:04.627690Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wWf0CzmY2+mMZanVwSV3E9AM28LCQs1hqqJDB0kFFyVASUTMYJI2kVfWR0useW3yU44OLXwMv9VPwJwuHJ0tBA==","signature_status":"signed_v1","signed_at":"2026-07-05T05:22:04.628144Z","signed_message":"canonical_sha256_bytes"},"source_id":"2110.01805","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cc2510921afcbff1a3cbc9102544c98c1da60957e21a71612760efaa595afc33","sha256:efc4bd15b790eb7fc4015d16f7fd7c1a00bb627e25e66a8cc3f71258c7f06e2b"],"state_sha256":"1825c95efb2c2f01ccf8774568f468b9d1cb52dcdcda7ac2429fb5129a5e47a9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2f5oFn6cPKg2rlWtYKXP38JvHmkhFgl6Mn3prGQagnALelG2REwXIyOBaDZxrUdbu/dI6NpNba4DO2k2RApTDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-17T12:19:54.986463Z","bundle_sha256":"098b958314cabd8ca96ef17294cf095c6d618aa8bf08047dfac041106f96435b"}}