{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:OX7OVBUCRZDJRXEO75HNBRNQ63","short_pith_number":"pith:OX7OVBUC","canonical_record":{"source":{"id":"1605.09249","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.NA","submitted_at":"2016-05-30T14:25:09Z","cross_cats_sorted":["physics.data-an"],"title_canon_sha256":"3631cff1582facd1412c6714f0d80f59bad24d02c08b7c38f9ff102888c5d4b8","abstract_canon_sha256":"22bbd9406d0cc3434c651a1bdf82fa4bf525fe68df287061628c0947b7de1ead"},"schema_version":"1.0"},"canonical_sha256":"75feea86828e4698dc8eff4ed0c5b0f6e7b1ac299ef8306abe1c4507b64ff9c1","source":{"kind":"arxiv","id":"1605.09249","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1605.09249","created_at":"2026-05-18T00:57:12Z"},{"alias_kind":"arxiv_version","alias_value":"1605.09249v2","created_at":"2026-05-18T00:57:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1605.09249","created_at":"2026-05-18T00:57:12Z"},{"alias_kind":"pith_short_12","alias_value":"OX7OVBUCRZDJ","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_16","alias_value":"OX7OVBUCRZDJRXEO","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_8","alias_value":"OX7OVBUC","created_at":"2026-05-18T12:30:36Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:OX7OVBUCRZDJRXEO75HNBRNQ63","target":"record","payload":{"canonical_record":{"source":{"id":"1605.09249","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.NA","submitted_at":"2016-05-30T14:25:09Z","cross_cats_sorted":["physics.data-an"],"title_canon_sha256":"3631cff1582facd1412c6714f0d80f59bad24d02c08b7c38f9ff102888c5d4b8","abstract_canon_sha256":"22bbd9406d0cc3434c651a1bdf82fa4bf525fe68df287061628c0947b7de1ead"},"schema_version":"1.0"},"canonical_sha256":"75feea86828e4698dc8eff4ed0c5b0f6e7b1ac299ef8306abe1c4507b64ff9c1","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:57:12.489487Z","signature_b64":"E6z6kEjhoR9poJKdhUuWFarJPzZC4pdhQrCnHvh1cvceS4jF6Ncp6l1T6+jCii7KbkLgieeMsp8BpyIeVL8GBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"75feea86828e4698dc8eff4ed0c5b0f6e7b1ac299ef8306abe1c4507b64ff9c1","last_reissued_at":"2026-05-18T00:57:12.488936Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:57:12.488936Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1605.09249","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:57:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TqAjjJUPcb8PiHMaf+N8v3khiEEt+v6CF7hLQV0sll3nJdOEps/jPFm3gXOKT7fSqzailOzw/hxK/U1s/p64Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T12:25:37.458847Z"},"content_sha256":"081b963ccaca1c903d39b784e0506a23a2a878698137c19d1ece25d73f85149a","schema_version":"1.0","event_id":"sha256:081b963ccaca1c903d39b784e0506a23a2a878698137c19d1ece25d73f85149a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:OX7OVBUCRZDJRXEO75HNBRNQ63","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Compressed sensing and sparsity in photoacoustic tomography","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.data-an"],"primary_cat":"math.NA","authors_text":"Markus Haltmeier, Peter Burgholzer, Sunghwan Moon, Thomas Berer","submitted_at":"2016-05-30T14:25:09Z","abstract_excerpt":"Increasing the imaging speed is a central aim in photoacoustic tomography. This issue is especially important in the case of sequential scanning approaches as applied for most existing optical detection schemes. In this work we address this issue using techniques of compressed sensing. We demonstrate, that the number of measurements can significantly be reduced by allowing general linear measurements instead of point-wise pressure values. A main requirement in compressed sensing is the sparsity of the unknowns to be recovered. For that purpose we develop the concept of sparsifying temporal tra"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1605.09249","kind":"arxiv","version":2},"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":"2026-05-18T00:57:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wuCt6EINZHtjHHIug/uMlPzj2jv3ZB51n+3f3E206xPLy7ByZBtwoyRsI9Np04ofYX8w2EKIFNOIfAlYDovTDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T12:25:37.459195Z"},"content_sha256":"677f7bc31704c1dc5c3ddfaf6ee15fc4a00db695bd076e1bdd023843cd32fc37","schema_version":"1.0","event_id":"sha256:677f7bc31704c1dc5c3ddfaf6ee15fc4a00db695bd076e1bdd023843cd32fc37"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OX7OVBUCRZDJRXEO75HNBRNQ63/bundle.json","state_url":"https://pith.science/pith/OX7OVBUCRZDJRXEO75HNBRNQ63/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OX7OVBUCRZDJRXEO75HNBRNQ63/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":"2026-06-04T12:25:37Z","links":{"resolver":"https://pith.science/pith/OX7OVBUCRZDJRXEO75HNBRNQ63","bundle":"https://pith.science/pith/OX7OVBUCRZDJRXEO75HNBRNQ63/bundle.json","state":"https://pith.science/pith/OX7OVBUCRZDJRXEO75HNBRNQ63/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OX7OVBUCRZDJRXEO75HNBRNQ63/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:OX7OVBUCRZDJRXEO75HNBRNQ63","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":"22bbd9406d0cc3434c651a1bdf82fa4bf525fe68df287061628c0947b7de1ead","cross_cats_sorted":["physics.data-an"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.NA","submitted_at":"2016-05-30T14:25:09Z","title_canon_sha256":"3631cff1582facd1412c6714f0d80f59bad24d02c08b7c38f9ff102888c5d4b8"},"schema_version":"1.0","source":{"id":"1605.09249","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1605.09249","created_at":"2026-05-18T00:57:12Z"},{"alias_kind":"arxiv_version","alias_value":"1605.09249v2","created_at":"2026-05-18T00:57:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1605.09249","created_at":"2026-05-18T00:57:12Z"},{"alias_kind":"pith_short_12","alias_value":"OX7OVBUCRZDJ","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_16","alias_value":"OX7OVBUCRZDJRXEO","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_8","alias_value":"OX7OVBUC","created_at":"2026-05-18T12:30:36Z"}],"graph_snapshots":[{"event_id":"sha256:677f7bc31704c1dc5c3ddfaf6ee15fc4a00db695bd076e1bdd023843cd32fc37","target":"graph","created_at":"2026-05-18T00:57:12Z","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":"Increasing the imaging speed is a central aim in photoacoustic tomography. This issue is especially important in the case of sequential scanning approaches as applied for most existing optical detection schemes. In this work we address this issue using techniques of compressed sensing. We demonstrate, that the number of measurements can significantly be reduced by allowing general linear measurements instead of point-wise pressure values. A main requirement in compressed sensing is the sparsity of the unknowns to be recovered. For that purpose we develop the concept of sparsifying temporal tra","authors_text":"Markus Haltmeier, Peter Burgholzer, Sunghwan Moon, Thomas Berer","cross_cats":["physics.data-an"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.NA","submitted_at":"2016-05-30T14:25:09Z","title":"Compressed sensing and sparsity in photoacoustic tomography"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1605.09249","kind":"arxiv","version":2},"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":"sha256:081b963ccaca1c903d39b784e0506a23a2a878698137c19d1ece25d73f85149a","target":"record","created_at":"2026-05-18T00:57:12Z","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":"22bbd9406d0cc3434c651a1bdf82fa4bf525fe68df287061628c0947b7de1ead","cross_cats_sorted":["physics.data-an"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.NA","submitted_at":"2016-05-30T14:25:09Z","title_canon_sha256":"3631cff1582facd1412c6714f0d80f59bad24d02c08b7c38f9ff102888c5d4b8"},"schema_version":"1.0","source":{"id":"1605.09249","kind":"arxiv","version":2}},"canonical_sha256":"75feea86828e4698dc8eff4ed0c5b0f6e7b1ac299ef8306abe1c4507b64ff9c1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"75feea86828e4698dc8eff4ed0c5b0f6e7b1ac299ef8306abe1c4507b64ff9c1","first_computed_at":"2026-05-18T00:57:12.488936Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:57:12.488936Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"E6z6kEjhoR9poJKdhUuWFarJPzZC4pdhQrCnHvh1cvceS4jF6Ncp6l1T6+jCii7KbkLgieeMsp8BpyIeVL8GBA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:57:12.489487Z","signed_message":"canonical_sha256_bytes"},"source_id":"1605.09249","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:081b963ccaca1c903d39b784e0506a23a2a878698137c19d1ece25d73f85149a","sha256:677f7bc31704c1dc5c3ddfaf6ee15fc4a00db695bd076e1bdd023843cd32fc37"],"state_sha256":"8377042ab1f9672a53b614f9aac0a7231284af89d448e53864e3fb8e529376bf"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7FElgOWZjn6V84imnZr75u2CHdw2dq5qn7jkVHNcfkQKz1rkS+vo/47RXSVJ9SXHy3TFjmjicPrUq2Wf5GUhCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T12:25:37.461110Z","bundle_sha256":"bd976cb44ebe06674699b1127246a64d011faf05ec8c6202e971a54a4006dd22"}}