{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:R3OU2AH3A37AI3P2JC75MA3SBN","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":"ff8830b3922574033df251914167746c0148b71daf7b4717466b24556684a98e","cross_cats_sorted":["cs.CR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.MM","submitted_at":"2015-01-08T08:02:01Z","title_canon_sha256":"23bcd4d340148202cee33e7a5cf06133bc3e61b5020bb11f20f7066e4ab41f4c"},"schema_version":"1.0","source":{"id":"1501.01755","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1501.01755","created_at":"2026-05-18T02:29:46Z"},{"alias_kind":"arxiv_version","alias_value":"1501.01755v1","created_at":"2026-05-18T02:29:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1501.01755","created_at":"2026-05-18T02:29:46Z"},{"alias_kind":"pith_short_12","alias_value":"R3OU2AH3A37A","created_at":"2026-05-18T12:29:39Z"},{"alias_kind":"pith_short_16","alias_value":"R3OU2AH3A37AI3P2","created_at":"2026-05-18T12:29:39Z"},{"alias_kind":"pith_short_8","alias_value":"R3OU2AH3","created_at":"2026-05-18T12:29:39Z"}],"graph_snapshots":[{"event_id":"sha256:44e625ec3757ea567195be987fe5ea7aeff8dd17d03f7a90c3f610b4f8cdebfa","target":"graph","created_at":"2026-05-18T02:29:46Z","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":"This paper investigates the use of Structural Similaritys (SSIM) index on the minimized side effect to image watermarking. For fast implementation and more compatibility with the standard DCT based codecs, watermark insertion is carried out on the DCT coefficients and hence a SSIM model for DCT based watermarking is developed. For faster implementation, the SSIM index is maximized over independent 4x4 non-overlapped blocks but the disparity between the adjacent blocks reduces the overall image quality. This problem is resolved through optimization of overlapped blocks, but, the higher image qu","authors_text":"Hossein Bakhshi Golestani, Mohammed Ghanbari","cross_cats":["cs.CR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.MM","submitted_at":"2015-01-08T08:02:01Z","title":"Minimization of image watermarking side effects through subjective optimization"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1501.01755","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":"sha256:53addadc2044b073bc6f9a79e188e741c3b0d1fdaab67d7ee4d6165c2191532a","target":"record","created_at":"2026-05-18T02:29:46Z","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":"ff8830b3922574033df251914167746c0148b71daf7b4717466b24556684a98e","cross_cats_sorted":["cs.CR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.MM","submitted_at":"2015-01-08T08:02:01Z","title_canon_sha256":"23bcd4d340148202cee33e7a5cf06133bc3e61b5020bb11f20f7066e4ab41f4c"},"schema_version":"1.0","source":{"id":"1501.01755","kind":"arxiv","version":1}},"canonical_sha256":"8edd4d00fb06fe046dfa48bfd603720b63429065ea78bf18c3079744cd1ab25e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8edd4d00fb06fe046dfa48bfd603720b63429065ea78bf18c3079744cd1ab25e","first_computed_at":"2026-05-18T02:29:46.454580Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:29:46.454580Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"TahB+jXCpfIAZRAFu+GuS4rR/NC42CREWwnKlzZhuXgnIG1dFP4R8r35FnacH+VNCdbdFJ1teNQc2UXMTr2pAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:29:46.455163Z","signed_message":"canonical_sha256_bytes"},"source_id":"1501.01755","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:53addadc2044b073bc6f9a79e188e741c3b0d1fdaab67d7ee4d6165c2191532a","sha256:44e625ec3757ea567195be987fe5ea7aeff8dd17d03f7a90c3f610b4f8cdebfa"],"state_sha256":"6a312169e2ebfbfe6e2e565740bb1ef1b417019ac043bab70184ab3fef9de86e"}