{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:KLXW6VNLETHNDW5VWJGUCYKXZS","short_pith_number":"pith:KLXW6VNL","canonical_record":{"source":{"id":"2505.23672","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.IV","submitted_at":"2025-05-29T17:15:34Z","cross_cats_sorted":[],"title_canon_sha256":"a8895ff704b78124039dbf98129a267224689be3e67ca5643117074ec41815cf","abstract_canon_sha256":"32a71320b3cd99d70e9ac6d6741366a3f25e1c7d0b2437a3b8649b06e5b06d6e"},"schema_version":"1.0"},"canonical_sha256":"52ef6f55ab24ced1dbb5b24d416157cc938e25ae5630cf404ebe309f05f61f31","source":{"kind":"arxiv","id":"2505.23672","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2505.23672","created_at":"2026-07-05T11:12:05Z"},{"alias_kind":"arxiv_version","alias_value":"2505.23672v1","created_at":"2026-07-05T11:12:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2505.23672","created_at":"2026-07-05T11:12:05Z"},{"alias_kind":"pith_short_12","alias_value":"KLXW6VNLETHN","created_at":"2026-07-05T11:12:05Z"},{"alias_kind":"pith_short_16","alias_value":"KLXW6VNLETHNDW5V","created_at":"2026-07-05T11:12:05Z"},{"alias_kind":"pith_short_8","alias_value":"KLXW6VNL","created_at":"2026-07-05T11:12:05Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:KLXW6VNLETHNDW5VWJGUCYKXZS","target":"record","payload":{"canonical_record":{"source":{"id":"2505.23672","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.IV","submitted_at":"2025-05-29T17:15:34Z","cross_cats_sorted":[],"title_canon_sha256":"a8895ff704b78124039dbf98129a267224689be3e67ca5643117074ec41815cf","abstract_canon_sha256":"32a71320b3cd99d70e9ac6d6741366a3f25e1c7d0b2437a3b8649b06e5b06d6e"},"schema_version":"1.0"},"canonical_sha256":"52ef6f55ab24ced1dbb5b24d416157cc938e25ae5630cf404ebe309f05f61f31","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:12:05.778878Z","signature_b64":"K1+rnwCZnxcTC+QR2R2yx4ChLW0nhmqaud1V4KE1FhltX65vi7VHQMA+mkEJ763AL7CE9+q3H9XBWUmrzZdQBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"52ef6f55ab24ced1dbb5b24d416157cc938e25ae5630cf404ebe309f05f61f31","last_reissued_at":"2026-07-05T11:12:05.778379Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:12:05.778379Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2505.23672","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":"2026-07-05T11:12:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uxfd3s2hIOuxZZ82MeWX1FArRqATCeLhtbwKwHTQ+W9o9oaIXdDr/xGuURX0AQBsYsHvJdYeCL47zyN7Oq32AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T01:44:05.854212Z"},"content_sha256":"54d05b09407561b34e612ef858fe667f4baca647f8431500065fb4e4729065fd","schema_version":"1.0","event_id":"sha256:54d05b09407561b34e612ef858fe667f4baca647f8431500065fb4e4729065fd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:KLXW6VNLETHNDW5VWJGUCYKXZS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Position Dependent Prediction Combination For Intra-Frame Video Coding","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"eess.IV","authors_text":"Amir Said, Feng Zou, Jianle Chen, Marta Karczewicz, Xin Zhao","submitted_at":"2025-05-29T17:15:34Z","abstract_excerpt":"Intra-frame prediction in the High Efficiency Video Coding (HEVC) standard can be empirically improved by applying sets of recursive two-dimensional filters to the predicted values. However, this approach does not allow (or complicates significantly) the parallel computation of pixel predictions. In this work we analyze why the recursive filters are effective, and use the results to derive sets of non-recursive predictors that have superior performance. We present an extension to HEVC intra prediction that combines values predicted using non-filtered and filtered (smoothed) reference samples, "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2505.23672","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/2505.23672/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":"2026-07-05T11:12:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OPT6gLS9mW3TC7zAQMiECKSH4qSEfvWlF64jAObtmnEAAKyenCreZrIHQ1QFm8rdts6GD87aBNq8jPyFW9VbBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T01:44:05.854701Z"},"content_sha256":"1060e6bb5b85a653603a2a1c51195a6acfdc1ea2a746f05047ba568fcf9c5e0f","schema_version":"1.0","event_id":"sha256:1060e6bb5b85a653603a2a1c51195a6acfdc1ea2a746f05047ba568fcf9c5e0f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KLXW6VNLETHNDW5VWJGUCYKXZS/bundle.json","state_url":"https://pith.science/pith/KLXW6VNLETHNDW5VWJGUCYKXZS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KLXW6VNLETHNDW5VWJGUCYKXZS/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":"2026-08-10T01:44:05Z","links":{"resolver":"https://pith.science/pith/KLXW6VNLETHNDW5VWJGUCYKXZS","bundle":"https://pith.science/pith/KLXW6VNLETHNDW5VWJGUCYKXZS/bundle.json","state":"https://pith.science/pith/KLXW6VNLETHNDW5VWJGUCYKXZS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KLXW6VNLETHNDW5VWJGUCYKXZS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:KLXW6VNLETHNDW5VWJGUCYKXZS","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":"32a71320b3cd99d70e9ac6d6741366a3f25e1c7d0b2437a3b8649b06e5b06d6e","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.IV","submitted_at":"2025-05-29T17:15:34Z","title_canon_sha256":"a8895ff704b78124039dbf98129a267224689be3e67ca5643117074ec41815cf"},"schema_version":"1.0","source":{"id":"2505.23672","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2505.23672","created_at":"2026-07-05T11:12:05Z"},{"alias_kind":"arxiv_version","alias_value":"2505.23672v1","created_at":"2026-07-05T11:12:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2505.23672","created_at":"2026-07-05T11:12:05Z"},{"alias_kind":"pith_short_12","alias_value":"KLXW6VNLETHN","created_at":"2026-07-05T11:12:05Z"},{"alias_kind":"pith_short_16","alias_value":"KLXW6VNLETHNDW5V","created_at":"2026-07-05T11:12:05Z"},{"alias_kind":"pith_short_8","alias_value":"KLXW6VNL","created_at":"2026-07-05T11:12:05Z"}],"graph_snapshots":[{"event_id":"sha256:1060e6bb5b85a653603a2a1c51195a6acfdc1ea2a746f05047ba568fcf9c5e0f","target":"graph","created_at":"2026-07-05T11:12:05Z","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/2505.23672/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Intra-frame prediction in the High Efficiency Video Coding (HEVC) standard can be empirically improved by applying sets of recursive two-dimensional filters to the predicted values. However, this approach does not allow (or complicates significantly) the parallel computation of pixel predictions. In this work we analyze why the recursive filters are effective, and use the results to derive sets of non-recursive predictors that have superior performance. We present an extension to HEVC intra prediction that combines values predicted using non-filtered and filtered (smoothed) reference samples, ","authors_text":"Amir Said, Feng Zou, Jianle Chen, Marta Karczewicz, Xin Zhao","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.IV","submitted_at":"2025-05-29T17:15:34Z","title":"Position Dependent Prediction Combination For Intra-Frame Video Coding"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2505.23672","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":"sha256:54d05b09407561b34e612ef858fe667f4baca647f8431500065fb4e4729065fd","target":"record","created_at":"2026-07-05T11:12:05Z","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":"32a71320b3cd99d70e9ac6d6741366a3f25e1c7d0b2437a3b8649b06e5b06d6e","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.IV","submitted_at":"2025-05-29T17:15:34Z","title_canon_sha256":"a8895ff704b78124039dbf98129a267224689be3e67ca5643117074ec41815cf"},"schema_version":"1.0","source":{"id":"2505.23672","kind":"arxiv","version":1}},"canonical_sha256":"52ef6f55ab24ced1dbb5b24d416157cc938e25ae5630cf404ebe309f05f61f31","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"52ef6f55ab24ced1dbb5b24d416157cc938e25ae5630cf404ebe309f05f61f31","first_computed_at":"2026-07-05T11:12:05.778379Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:12:05.778379Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"K1+rnwCZnxcTC+QR2R2yx4ChLW0nhmqaud1V4KE1FhltX65vi7VHQMA+mkEJ763AL7CE9+q3H9XBWUmrzZdQBw==","signature_status":"signed_v1","signed_at":"2026-07-05T11:12:05.778878Z","signed_message":"canonical_sha256_bytes"},"source_id":"2505.23672","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:54d05b09407561b34e612ef858fe667f4baca647f8431500065fb4e4729065fd","sha256:1060e6bb5b85a653603a2a1c51195a6acfdc1ea2a746f05047ba568fcf9c5e0f"],"state_sha256":"05011c649bdeee58c4dc6981428d3d10e04b3996bd0db680ed8a146393a585a7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rUkdONGHSCTpkDwpeQ2rXgXt4WZOkUUyPbQa+hIxkKCoSEJpwrYlaLUGqlCeCxuPZ29WV1e9XUhOD2L2VKHVDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-10T01:44:05.858665Z","bundle_sha256":"e5bd38158008223fd817bad07b1efcf1cfc6c4f445ffb6866a086e75ca0d9e44"}}