{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:VPSSSORE63YKFNU3ZY2AQOWYIT","short_pith_number":"pith:VPSSSORE","canonical_record":{"source":{"id":"1801.07023","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2018-01-22T10:16:55Z","cross_cats_sorted":["eess.SP"],"title_canon_sha256":"19b43f2affe954b7572abeb3ea08117265dd8fa387441ebb1a2cdf4b0e153257","abstract_canon_sha256":"fe55c57f613e6eb042222ef32ce6873707b34f46dbf8c5a8e845de04cee7028d"},"schema_version":"1.0"},"canonical_sha256":"abe5293a24f6f0a2b69bce34083ad844c77f5dc551f5c915d26a3693a234a1bf","source":{"kind":"arxiv","id":"1801.07023","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.07023","created_at":"2026-05-18T00:25:22Z"},{"alias_kind":"arxiv_version","alias_value":"1801.07023v1","created_at":"2026-05-18T00:25:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.07023","created_at":"2026-05-18T00:25:22Z"},{"alias_kind":"pith_short_12","alias_value":"VPSSSORE63YK","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_16","alias_value":"VPSSSORE63YKFNU3","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_8","alias_value":"VPSSSORE","created_at":"2026-05-18T12:32:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:VPSSSORE63YKFNU3ZY2AQOWYIT","target":"record","payload":{"canonical_record":{"source":{"id":"1801.07023","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2018-01-22T10:16:55Z","cross_cats_sorted":["eess.SP"],"title_canon_sha256":"19b43f2affe954b7572abeb3ea08117265dd8fa387441ebb1a2cdf4b0e153257","abstract_canon_sha256":"fe55c57f613e6eb042222ef32ce6873707b34f46dbf8c5a8e845de04cee7028d"},"schema_version":"1.0"},"canonical_sha256":"abe5293a24f6f0a2b69bce34083ad844c77f5dc551f5c915d26a3693a234a1bf","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:25:22.465686Z","signature_b64":"yMXqG2oNiiHRIKMYcBhmtSTzQBm6M3BkeZGEX7P35M42M0NhvipyHT7rog07hD9sAN5kwBZ38XhRO6l1rGm8BQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"abe5293a24f6f0a2b69bce34083ad844c77f5dc551f5c915d26a3693a234a1bf","last_reissued_at":"2026-05-18T00:25:22.465078Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:25:22.465078Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1801.07023","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":"2026-05-18T00:25:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2TFnS5p+jyJ9WYO9bOMD4+CnffX7ji/4ED90rYK+Or3m8ZB6qNv0eeGONeOej1EJH0Z6KljCpu+N8iY9raSdAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-25T00:41:35.590055Z"},"content_sha256":"e3da6b710bb225aedfac28800cddf9f405bc6f8d718d72fe0e3f291b2ad48623","schema_version":"1.0","event_id":"sha256:e3da6b710bb225aedfac28800cddf9f405bc6f8d718d72fe0e3f291b2ad48623"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:VPSSSORE63YKFNU3ZY2AQOWYIT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Novel Contourlet Domain Watermark Detector for Copyright Protection","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["eess.SP"],"primary_cat":"eess.IV","authors_text":"Maryam Amirmazlaghani","submitted_at":"2018-01-22T10:16:55Z","abstract_excerpt":"Digital media can be distributed via Internet easily, so, media owners are eagerly seeking methods to protect their rights. A typical solution is digital watermarking for copyright protection. In this paper, we propose a novel contourlet domain image watermarking scheme for copyright protection. In the embedding phase, we insert the watermark into the image using an additive contourlet domain spread spectrum approach. In the detection phase, we design a detector using likelihood ratio test (LRT). Since the performance of the LRT detector is completely dependent on the accuracy of the employed "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.07023","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":""},"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":"2026-05-18T00:25:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9gPawonCoUgh4c012RKRY26HwHXTRNjMetSCUl/KeKJ++XIuFHZNl+2eQENo7KVgMCM1CFHASLeR3Sp2txdLAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-25T00:41:35.590435Z"},"content_sha256":"8b440bfe959d97b76010974074dc1ddbeb9ebbaf90b4cbea6577159e6df77245","schema_version":"1.0","event_id":"sha256:8b440bfe959d97b76010974074dc1ddbeb9ebbaf90b4cbea6577159e6df77245"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VPSSSORE63YKFNU3ZY2AQOWYIT/bundle.json","state_url":"https://pith.science/pith/VPSSSORE63YKFNU3ZY2AQOWYIT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VPSSSORE63YKFNU3ZY2AQOWYIT/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":"2026-07-25T00:41:35Z","links":{"resolver":"https://pith.science/pith/VPSSSORE63YKFNU3ZY2AQOWYIT","bundle":"https://pith.science/pith/VPSSSORE63YKFNU3ZY2AQOWYIT/bundle.json","state":"https://pith.science/pith/VPSSSORE63YKFNU3ZY2AQOWYIT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VPSSSORE63YKFNU3ZY2AQOWYIT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:VPSSSORE63YKFNU3ZY2AQOWYIT","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":"fe55c57f613e6eb042222ef32ce6873707b34f46dbf8c5a8e845de04cee7028d","cross_cats_sorted":["eess.SP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2018-01-22T10:16:55Z","title_canon_sha256":"19b43f2affe954b7572abeb3ea08117265dd8fa387441ebb1a2cdf4b0e153257"},"schema_version":"1.0","source":{"id":"1801.07023","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.07023","created_at":"2026-05-18T00:25:22Z"},{"alias_kind":"arxiv_version","alias_value":"1801.07023v1","created_at":"2026-05-18T00:25:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.07023","created_at":"2026-05-18T00:25:22Z"},{"alias_kind":"pith_short_12","alias_value":"VPSSSORE63YK","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_16","alias_value":"VPSSSORE63YKFNU3","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_8","alias_value":"VPSSSORE","created_at":"2026-05-18T12:32:59Z"}],"graph_snapshots":[{"event_id":"sha256:8b440bfe959d97b76010974074dc1ddbeb9ebbaf90b4cbea6577159e6df77245","target":"graph","created_at":"2026-05-18T00:25:22Z","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":"Digital media can be distributed via Internet easily, so, media owners are eagerly seeking methods to protect their rights. A typical solution is digital watermarking for copyright protection. In this paper, we propose a novel contourlet domain image watermarking scheme for copyright protection. In the embedding phase, we insert the watermark into the image using an additive contourlet domain spread spectrum approach. In the detection phase, we design a detector using likelihood ratio test (LRT). Since the performance of the LRT detector is completely dependent on the accuracy of the employed ","authors_text":"Maryam Amirmazlaghani","cross_cats":["eess.SP"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2018-01-22T10:16:55Z","title":"A Novel Contourlet Domain Watermark Detector for Copyright Protection"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.07023","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:e3da6b710bb225aedfac28800cddf9f405bc6f8d718d72fe0e3f291b2ad48623","target":"record","created_at":"2026-05-18T00:25:22Z","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":"fe55c57f613e6eb042222ef32ce6873707b34f46dbf8c5a8e845de04cee7028d","cross_cats_sorted":["eess.SP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.IV","submitted_at":"2018-01-22T10:16:55Z","title_canon_sha256":"19b43f2affe954b7572abeb3ea08117265dd8fa387441ebb1a2cdf4b0e153257"},"schema_version":"1.0","source":{"id":"1801.07023","kind":"arxiv","version":1}},"canonical_sha256":"abe5293a24f6f0a2b69bce34083ad844c77f5dc551f5c915d26a3693a234a1bf","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"abe5293a24f6f0a2b69bce34083ad844c77f5dc551f5c915d26a3693a234a1bf","first_computed_at":"2026-05-18T00:25:22.465078Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:25:22.465078Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"yMXqG2oNiiHRIKMYcBhmtSTzQBm6M3BkeZGEX7P35M42M0NhvipyHT7rog07hD9sAN5kwBZ38XhRO6l1rGm8BQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:25:22.465686Z","signed_message":"canonical_sha256_bytes"},"source_id":"1801.07023","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e3da6b710bb225aedfac28800cddf9f405bc6f8d718d72fe0e3f291b2ad48623","sha256:8b440bfe959d97b76010974074dc1ddbeb9ebbaf90b4cbea6577159e6df77245"],"state_sha256":"0b7fd865c218b7c49f664f400b50e9050892f6001ca43374096c14abf5303f71"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"doa5YeHkQ+g+Lk//lYQCAcoCJ5bAdaFfU4jyLXDeo/lDbUEt9GzQqk2JpdEC3VrUNVTFB0p5f8geyizBQaq8Bw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-25T00:41:35.592421Z","bundle_sha256":"ff649f9ebda8b9f96712af7789cd95770178899b87495d447d083c6a163c080a"}}