{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2022:3YLAJ64YOT4A5ONDDYZDV37CUP","short_pith_number":"pith:3YLAJ64Y","canonical_record":{"source":{"id":"2202.00172","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.IV","submitted_at":"2022-02-01T01:00:28Z","cross_cats_sorted":["cs.CV"],"title_canon_sha256":"b96af774fa6b04c0ceee908e629e812f821685aec3c79dce676e01ed49a17873","abstract_canon_sha256":"b91b6c6bc40c6f69cf877bccc5b2f4c19ca9e1ec25e40cdd61e556919fa67f0c"},"schema_version":"1.0"},"canonical_sha256":"de1604fb9874f80eb9a31e323aefe2a3da83eb4d70a6fe1fe30908e7d63eb2b6","source":{"kind":"arxiv","id":"2202.00172","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2202.00172","created_at":"2026-07-05T03:53:19Z"},{"alias_kind":"arxiv_version","alias_value":"2202.00172v1","created_at":"2026-07-05T03:53:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2202.00172","created_at":"2026-07-05T03:53:19Z"},{"alias_kind":"pith_short_12","alias_value":"3YLAJ64YOT4A","created_at":"2026-07-05T03:53:19Z"},{"alias_kind":"pith_short_16","alias_value":"3YLAJ64YOT4A5OND","created_at":"2026-07-05T03:53:19Z"},{"alias_kind":"pith_short_8","alias_value":"3YLAJ64Y","created_at":"2026-07-05T03:53:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2022:3YLAJ64YOT4A5ONDDYZDV37CUP","target":"record","payload":{"canonical_record":{"source":{"id":"2202.00172","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.IV","submitted_at":"2022-02-01T01:00:28Z","cross_cats_sorted":["cs.CV"],"title_canon_sha256":"b96af774fa6b04c0ceee908e629e812f821685aec3c79dce676e01ed49a17873","abstract_canon_sha256":"b91b6c6bc40c6f69cf877bccc5b2f4c19ca9e1ec25e40cdd61e556919fa67f0c"},"schema_version":"1.0"},"canonical_sha256":"de1604fb9874f80eb9a31e323aefe2a3da83eb4d70a6fe1fe30908e7d63eb2b6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:53:19.337475Z","signature_b64":"4jCpG+qY0aWX6JfxLnAwHFPWrot86OwI9PZ33OUsXBdQThjILsrsKzcvumTbTl2D1K/bl9OTwjObrvMuKdI8AA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"de1604fb9874f80eb9a31e323aefe2a3da83eb4d70a6fe1fe30908e7d63eb2b6","last_reissued_at":"2026-07-05T03:53:19.336740Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:53:19.336740Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2202.00172","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":"2026-07-05T03:53:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9Bd7tj3Kd6VLdphOaXTwS8qQgEjuABSkogc8VGEXOmkhRB66wL2gZHc8upIq3tNwbHZ6TePigbGHUZX1QwZECg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T04:59:49.825688Z"},"content_sha256":"bcb77d70c8b69dfcca860a1db7906dd125d620a39cef46a9732841b8f56967f7","schema_version":"1.0","event_id":"sha256:bcb77d70c8b69dfcca860a1db7906dd125d620a39cef46a9732841b8f56967f7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2022:3YLAJ64YOT4A5ONDDYZDV37CUP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Fractional Motion Estimation for Point Cloud Compression","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cs.CV"],"primary_cat":"eess.IV","authors_text":"Antonio Ortega, Eduardo Pavez, Haoran Hong, Keisuke Nonaka, Ryosuke Watanabe","submitted_at":"2022-02-01T01:00:28Z","abstract_excerpt":"Motivated by the success of fractional pixel motion in video coding, we explore the design of motion estimation with fractional-voxel resolution for compression of color attributes of dynamic 3D point clouds. Our proposed block-based fractional-voxel motion estimation scheme takes into account the fundamental differences between point clouds and videos, i.e., the irregularity of the distribution of voxels within a frame and across frames. We show that motion compensation can benefit from the higher resolution reference and more accurate displacements provided by fractional precision. Our propo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2202.00172","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/2202.00172/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":"2026-07-05T03:53:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jTS1L45qnlhLn1RWkrsNC/9QPMAEJcQyTaKx99tah7xbyklFJuGsvftztP76l/BcM6KUyBlJjaNItKu8D+FjDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T04:59:49.826189Z"},"content_sha256":"1b9066921fffa6c747990b7d1c38a3a511f37322a1d7beeefd42b739a286fd54","schema_version":"1.0","event_id":"sha256:1b9066921fffa6c747990b7d1c38a3a511f37322a1d7beeefd42b739a286fd54"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3YLAJ64YOT4A5ONDDYZDV37CUP/bundle.json","state_url":"https://pith.science/pith/3YLAJ64YOT4A5ONDDYZDV37CUP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3YLAJ64YOT4A5ONDDYZDV37CUP/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":"2026-08-23T04:59:49Z","links":{"resolver":"https://pith.science/pith/3YLAJ64YOT4A5ONDDYZDV37CUP","bundle":"https://pith.science/pith/3YLAJ64YOT4A5ONDDYZDV37CUP/bundle.json","state":"https://pith.science/pith/3YLAJ64YOT4A5ONDDYZDV37CUP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3YLAJ64YOT4A5ONDDYZDV37CUP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:3YLAJ64YOT4A5ONDDYZDV37CUP","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":"b91b6c6bc40c6f69cf877bccc5b2f4c19ca9e1ec25e40cdd61e556919fa67f0c","cross_cats_sorted":["cs.CV"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.IV","submitted_at":"2022-02-01T01:00:28Z","title_canon_sha256":"b96af774fa6b04c0ceee908e629e812f821685aec3c79dce676e01ed49a17873"},"schema_version":"1.0","source":{"id":"2202.00172","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2202.00172","created_at":"2026-07-05T03:53:19Z"},{"alias_kind":"arxiv_version","alias_value":"2202.00172v1","created_at":"2026-07-05T03:53:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2202.00172","created_at":"2026-07-05T03:53:19Z"},{"alias_kind":"pith_short_12","alias_value":"3YLAJ64YOT4A","created_at":"2026-07-05T03:53:19Z"},{"alias_kind":"pith_short_16","alias_value":"3YLAJ64YOT4A5OND","created_at":"2026-07-05T03:53:19Z"},{"alias_kind":"pith_short_8","alias_value":"3YLAJ64Y","created_at":"2026-07-05T03:53:19Z"}],"graph_snapshots":[{"event_id":"sha256:1b9066921fffa6c747990b7d1c38a3a511f37322a1d7beeefd42b739a286fd54","target":"graph","created_at":"2026-07-05T03:53:19Z","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/2202.00172/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Motivated by the success of fractional pixel motion in video coding, we explore the design of motion estimation with fractional-voxel resolution for compression of color attributes of dynamic 3D point clouds. Our proposed block-based fractional-voxel motion estimation scheme takes into account the fundamental differences between point clouds and videos, i.e., the irregularity of the distribution of voxels within a frame and across frames. We show that motion compensation can benefit from the higher resolution reference and more accurate displacements provided by fractional precision. Our propo","authors_text":"Antonio Ortega, Eduardo Pavez, Haoran Hong, Keisuke Nonaka, Ryosuke Watanabe","cross_cats":["cs.CV"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.IV","submitted_at":"2022-02-01T01:00:28Z","title":"Fractional Motion Estimation for Point Cloud Compression"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2202.00172","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:bcb77d70c8b69dfcca860a1db7906dd125d620a39cef46a9732841b8f56967f7","target":"record","created_at":"2026-07-05T03:53:19Z","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":"b91b6c6bc40c6f69cf877bccc5b2f4c19ca9e1ec25e40cdd61e556919fa67f0c","cross_cats_sorted":["cs.CV"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.IV","submitted_at":"2022-02-01T01:00:28Z","title_canon_sha256":"b96af774fa6b04c0ceee908e629e812f821685aec3c79dce676e01ed49a17873"},"schema_version":"1.0","source":{"id":"2202.00172","kind":"arxiv","version":1}},"canonical_sha256":"de1604fb9874f80eb9a31e323aefe2a3da83eb4d70a6fe1fe30908e7d63eb2b6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"de1604fb9874f80eb9a31e323aefe2a3da83eb4d70a6fe1fe30908e7d63eb2b6","first_computed_at":"2026-07-05T03:53:19.336740Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:53:19.336740Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4jCpG+qY0aWX6JfxLnAwHFPWrot86OwI9PZ33OUsXBdQThjILsrsKzcvumTbTl2D1K/bl9OTwjObrvMuKdI8AA==","signature_status":"signed_v1","signed_at":"2026-07-05T03:53:19.337475Z","signed_message":"canonical_sha256_bytes"},"source_id":"2202.00172","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bcb77d70c8b69dfcca860a1db7906dd125d620a39cef46a9732841b8f56967f7","sha256:1b9066921fffa6c747990b7d1c38a3a511f37322a1d7beeefd42b739a286fd54"],"state_sha256":"c7742f15b5cb3a936dc7ccf129a55cdb8919473b2029b7c23c814ad3c6413dda"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9xdgOHgAPoJ3mvUxaY8eGa7jJG1wVwYLlOdX/cOzoIryreimfYRXmiJy7AIEWgbKZHHp0Bfhb13kGN93DV+HAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-23T04:59:49.831359Z","bundle_sha256":"9c7dba0d5e10c644f12777c7f8e65bd3e3fae0e2858027c50a61133514b7c65e"}}