{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:MKFK7JBF7IZZBWVGEMLFVJM7A2","short_pith_number":"pith:MKFK7JBF","canonical_record":{"source":{"id":"2607.22793","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.IV","submitted_at":"2026-07-24T13:31:22Z","cross_cats_sorted":["cs.CV"],"title_canon_sha256":"76c87436e01979b073728294cd538b41db8237e220a0efe88489a7de74ae460f","abstract_canon_sha256":"d5d2c332f0ef37113f2dcba67b6adc8826045a67fd82370c3c95d5767aed53bf"},"schema_version":"1.0"},"canonical_sha256":"628aafa425fa3390daa623165aa59f06a5a6c1e806b7867a80dbbfb4d479d4aa","source":{"kind":"arxiv","id":"2607.22793","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.22793","created_at":"2026-07-28T00:21:54Z"},{"alias_kind":"arxiv_version","alias_value":"2607.22793v1","created_at":"2026-07-28T00:21:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.22793","created_at":"2026-07-28T00:21:54Z"},{"alias_kind":"pith_short_12","alias_value":"MKFK7JBF7IZZ","created_at":"2026-07-28T00:21:54Z"},{"alias_kind":"pith_short_16","alias_value":"MKFK7JBF7IZZBWVG","created_at":"2026-07-28T00:21:54Z"},{"alias_kind":"pith_short_8","alias_value":"MKFK7JBF","created_at":"2026-07-28T00:21:54Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:MKFK7JBF7IZZBWVGEMLFVJM7A2","target":"record","payload":{"canonical_record":{"source":{"id":"2607.22793","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.IV","submitted_at":"2026-07-24T13:31:22Z","cross_cats_sorted":["cs.CV"],"title_canon_sha256":"76c87436e01979b073728294cd538b41db8237e220a0efe88489a7de74ae460f","abstract_canon_sha256":"d5d2c332f0ef37113f2dcba67b6adc8826045a67fd82370c3c95d5767aed53bf"},"schema_version":"1.0"},"canonical_sha256":"628aafa425fa3390daa623165aa59f06a5a6c1e806b7867a80dbbfb4d479d4aa","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-28T00:21:54.595494Z","signature_b64":"lSL+sT8buYnOor3eAe+BedehuCwVk01I7tHaZU1rREWkCd47UzpNE6gMk74snSHDWGD74yhvhjoGijc4O0I2Dw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"628aafa425fa3390daa623165aa59f06a5a6c1e806b7867a80dbbfb4d479d4aa","last_reissued_at":"2026-07-28T00:21:54.594576Z","signature_status":"signed_v1","first_computed_at":"2026-07-28T00:21:54.594576Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2607.22793","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":"2026-07-28T00:21:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AKVH2yXvRiaYhiTBBj7CLRIBo0qvaPg1Nx9hPutfexb3426m4Ujp23jMzKb1tVqKE5uzXzuZrLpQD5KwIbPkBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T20:11:18.303321Z"},"content_sha256":"b6b873a0c5e09fd10b0c3ece348d42a63230c361b80a64fca37780cbcd627d74","schema_version":"1.0","event_id":"sha256:b6b873a0c5e09fd10b0c3ece348d42a63230c361b80a64fca37780cbcd627d74"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:MKFK7JBF7IZZBWVGEMLFVJM7A2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Small, Bias-Free, Blind and Convolutional Denoiser: A compact ConvNeXt U-Net for blind Gaussian color-image denoising","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cs.CV"],"primary_cat":"eess.IV","authors_text":"Nikolas Markou","submitted_at":"2026-07-24T13:31:22Z","abstract_excerpt":"We describe and evaluate BF-ConvUNeXt, a compact bias-free ConvNeXt U-Net for blind additive-white-Gaussian-noise color image denoising, combining four existing ingredients so a single property survives end to end: a frozen depthwise Gabor stem (oriented band-pass, zero trainable parameters), a Laplacian-pyramid encoder routing the high-frequency residual into each skip connection, a ConvNeXt-V1 U-Net body, and bias-free construction throughout (no additive bias, linear head, LeakyReLU, variance-only batch norm). Together these make the 0.82M-parameter network exactly degree-1 homogeneous at i"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.22793","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/2607.22793/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":"2026-07-28T00:21:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lqHNOov/avGnX1YYsIqJFeftQ0QLTVmQbEAkgbfjpBmLFUo3ia3hutk7iV/rQ8Hy++GW0049jThJ1AIxCr6/Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T20:11:18.303819Z"},"content_sha256":"452c36e0d3f0dc26ebd0e1dc8442ad24512d682e6165d9149c0d52296d745c66","schema_version":"1.0","event_id":"sha256:452c36e0d3f0dc26ebd0e1dc8442ad24512d682e6165d9149c0d52296d745c66"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MKFK7JBF7IZZBWVGEMLFVJM7A2/bundle.json","state_url":"https://pith.science/pith/MKFK7JBF7IZZBWVGEMLFVJM7A2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MKFK7JBF7IZZBWVGEMLFVJM7A2/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":"2026-08-03T20:11:18Z","links":{"resolver":"https://pith.science/pith/MKFK7JBF7IZZBWVGEMLFVJM7A2","bundle":"https://pith.science/pith/MKFK7JBF7IZZBWVGEMLFVJM7A2/bundle.json","state":"https://pith.science/pith/MKFK7JBF7IZZBWVGEMLFVJM7A2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MKFK7JBF7IZZBWVGEMLFVJM7A2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:MKFK7JBF7IZZBWVGEMLFVJM7A2","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":"d5d2c332f0ef37113f2dcba67b6adc8826045a67fd82370c3c95d5767aed53bf","cross_cats_sorted":["cs.CV"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.IV","submitted_at":"2026-07-24T13:31:22Z","title_canon_sha256":"76c87436e01979b073728294cd538b41db8237e220a0efe88489a7de74ae460f"},"schema_version":"1.0","source":{"id":"2607.22793","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.22793","created_at":"2026-07-28T00:21:54Z"},{"alias_kind":"arxiv_version","alias_value":"2607.22793v1","created_at":"2026-07-28T00:21:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.22793","created_at":"2026-07-28T00:21:54Z"},{"alias_kind":"pith_short_12","alias_value":"MKFK7JBF7IZZ","created_at":"2026-07-28T00:21:54Z"},{"alias_kind":"pith_short_16","alias_value":"MKFK7JBF7IZZBWVG","created_at":"2026-07-28T00:21:54Z"},{"alias_kind":"pith_short_8","alias_value":"MKFK7JBF","created_at":"2026-07-28T00:21:54Z"}],"graph_snapshots":[{"event_id":"sha256:452c36e0d3f0dc26ebd0e1dc8442ad24512d682e6165d9149c0d52296d745c66","target":"graph","created_at":"2026-07-28T00:21:54Z","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/2607.22793/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We describe and evaluate BF-ConvUNeXt, a compact bias-free ConvNeXt U-Net for blind additive-white-Gaussian-noise color image denoising, combining four existing ingredients so a single property survives end to end: a frozen depthwise Gabor stem (oriented band-pass, zero trainable parameters), a Laplacian-pyramid encoder routing the high-frequency residual into each skip connection, a ConvNeXt-V1 U-Net body, and bias-free construction throughout (no additive bias, linear head, LeakyReLU, variance-only batch norm). Together these make the 0.82M-parameter network exactly degree-1 homogeneous at i","authors_text":"Nikolas Markou","cross_cats":["cs.CV"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.IV","submitted_at":"2026-07-24T13:31:22Z","title":"Small, Bias-Free, Blind and Convolutional Denoiser: A compact ConvNeXt U-Net for blind Gaussian color-image denoising"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.22793","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:b6b873a0c5e09fd10b0c3ece348d42a63230c361b80a64fca37780cbcd627d74","target":"record","created_at":"2026-07-28T00:21:54Z","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":"d5d2c332f0ef37113f2dcba67b6adc8826045a67fd82370c3c95d5767aed53bf","cross_cats_sorted":["cs.CV"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.IV","submitted_at":"2026-07-24T13:31:22Z","title_canon_sha256":"76c87436e01979b073728294cd538b41db8237e220a0efe88489a7de74ae460f"},"schema_version":"1.0","source":{"id":"2607.22793","kind":"arxiv","version":1}},"canonical_sha256":"628aafa425fa3390daa623165aa59f06a5a6c1e806b7867a80dbbfb4d479d4aa","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"628aafa425fa3390daa623165aa59f06a5a6c1e806b7867a80dbbfb4d479d4aa","first_computed_at":"2026-07-28T00:21:54.594576Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-28T00:21:54.594576Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"lSL+sT8buYnOor3eAe+BedehuCwVk01I7tHaZU1rREWkCd47UzpNE6gMk74snSHDWGD74yhvhjoGijc4O0I2Dw==","signature_status":"signed_v1","signed_at":"2026-07-28T00:21:54.595494Z","signed_message":"canonical_sha256_bytes"},"source_id":"2607.22793","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b6b873a0c5e09fd10b0c3ece348d42a63230c361b80a64fca37780cbcd627d74","sha256:452c36e0d3f0dc26ebd0e1dc8442ad24512d682e6165d9149c0d52296d745c66"],"state_sha256":"0a353999a957a27ee61dd35d26a1c49519848b75a0513920d1c8dcda0067e8cf"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RCzR80jKeKTB61sfFHMB77H9ZhI5YqqNOPg2lBeNYTv0+3FBaoeruOK/W4hBOsavocyl4Fc50DiikqHzg5xWBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-03T20:11:18.307607Z","bundle_sha256":"069fdcd889b98e11fcbff421f5ed47ec4e44f8906fa16619d523968476d892a3"}}