{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:GR5KSBTRIBASWWRJWZNA7M2CQ4","short_pith_number":"pith:GR5KSBTR","canonical_record":{"source":{"id":"1505.06219","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2015-04-07T01:26:06Z","cross_cats_sorted":[],"title_canon_sha256":"35cb7aaafce560657bbf45560726334ebd1a6feb1fd41cc782550ece366deedd","abstract_canon_sha256":"07cf47ee550ac8ce55ab86fd03a79c470a1ad70c0f5177e7f6b8220d6aced428"},"schema_version":"1.0"},"canonical_sha256":"347aa9067140412b5a29b65a0fb342871c1822f5c1fda0ed2126ce90e55dae62","source":{"kind":"arxiv","id":"1505.06219","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1505.06219","created_at":"2026-05-18T02:03:47Z"},{"alias_kind":"arxiv_version","alias_value":"1505.06219v1","created_at":"2026-05-18T02:03:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1505.06219","created_at":"2026-05-18T02:03:47Z"},{"alias_kind":"pith_short_12","alias_value":"GR5KSBTRIBAS","created_at":"2026-05-18T12:29:22Z"},{"alias_kind":"pith_short_16","alias_value":"GR5KSBTRIBASWWRJ","created_at":"2026-05-18T12:29:22Z"},{"alias_kind":"pith_short_8","alias_value":"GR5KSBTR","created_at":"2026-05-18T12:29:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:GR5KSBTRIBASWWRJWZNA7M2CQ4","target":"record","payload":{"canonical_record":{"source":{"id":"1505.06219","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2015-04-07T01:26:06Z","cross_cats_sorted":[],"title_canon_sha256":"35cb7aaafce560657bbf45560726334ebd1a6feb1fd41cc782550ece366deedd","abstract_canon_sha256":"07cf47ee550ac8ce55ab86fd03a79c470a1ad70c0f5177e7f6b8220d6aced428"},"schema_version":"1.0"},"canonical_sha256":"347aa9067140412b5a29b65a0fb342871c1822f5c1fda0ed2126ce90e55dae62","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:03:47.923286Z","signature_b64":"eafr+w6RS+PCA9/+XPXqoNJIaRtwRCczqZSBGWtKiouU7D1r77FjC/vk/pUuP4H20WH3kjf8K8S0OyYOTATIDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"347aa9067140412b5a29b65a0fb342871c1822f5c1fda0ed2126ce90e55dae62","last_reissued_at":"2026-05-18T02:03:47.922856Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:03:47.922856Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1505.06219","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":"2026-05-18T02:03:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"e6Angbi0helGRh5HWJtLLNigO+K+1cGS0r3+27Yh51GouCguPpOgGw+nDJAxm01hdY5AY2Q27B4MgUCSaSr3BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T16:56:01.144676Z"},"content_sha256":"b3caa05fae68ead58ac7c1fcfb847c052b4510bda39dfd6cdd00e0c416b808e4","schema_version":"1.0","event_id":"sha256:b3caa05fae68ead58ac7c1fcfb847c052b4510bda39dfd6cdd00e0c416b808e4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:GR5KSBTRIBASWWRJWZNA7M2CQ4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A comparative study between proposed Hyper Kurtosis based Modified Duo-Histogram Equalization (HKMDHE) and Contrast Limited Adaptive Histogram Equalization (CLAHE) for Contrast Enhancement Purpose of Low Contrast Human Brain CT scan images","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.CV","authors_text":"Nirmalya Ghosh, Prasanta K. Panigrahi, Ritwik Burman, Sabyasachi Mukhopadhyay, Satyasaran Changdar, Sawon Pratiher, Soham Mandal","submitted_at":"2015-04-07T01:26:06Z","abstract_excerpt":"In this paper, a comparative study between proposed hyper kurtosis based modified duo-histogram equalization (HKMDHE) algorithm and contrast limited adaptive histogram enhancement (CLAHE) has been presented for the implementation of contrast enhancement and brightness preservation of low contrast human brain CT scan images. In HKMDHE algorithm, contrast enhancement is done on the hyper-kurtosis based application. The results are very promising of proposed HKMDHE technique with improved PSNR values and lesser AMMBE values than CLAHE technique."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.06219","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":"2026-05-18T02:03:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZrNavoGoVA/rG6QzHWmnNzuHRiplnrGF7wo5VOtRKEy7lxAWSpM6s8hXy/epS3osPBpd4J3gLTLqr3s0qEwSBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T16:56:01.145302Z"},"content_sha256":"28d68907e3934c9c393a300091e71ac6dca2aef03d2a1fe899aea493ce20aec6","schema_version":"1.0","event_id":"sha256:28d68907e3934c9c393a300091e71ac6dca2aef03d2a1fe899aea493ce20aec6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GR5KSBTRIBASWWRJWZNA7M2CQ4/bundle.json","state_url":"https://pith.science/pith/GR5KSBTRIBASWWRJWZNA7M2CQ4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GR5KSBTRIBASWWRJWZNA7M2CQ4/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":"2026-05-26T16:56:01Z","links":{"resolver":"https://pith.science/pith/GR5KSBTRIBASWWRJWZNA7M2CQ4","bundle":"https://pith.science/pith/GR5KSBTRIBASWWRJWZNA7M2CQ4/bundle.json","state":"https://pith.science/pith/GR5KSBTRIBASWWRJWZNA7M2CQ4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GR5KSBTRIBASWWRJWZNA7M2CQ4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:GR5KSBTRIBASWWRJWZNA7M2CQ4","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":"07cf47ee550ac8ce55ab86fd03a79c470a1ad70c0f5177e7f6b8220d6aced428","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2015-04-07T01:26:06Z","title_canon_sha256":"35cb7aaafce560657bbf45560726334ebd1a6feb1fd41cc782550ece366deedd"},"schema_version":"1.0","source":{"id":"1505.06219","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1505.06219","created_at":"2026-05-18T02:03:47Z"},{"alias_kind":"arxiv_version","alias_value":"1505.06219v1","created_at":"2026-05-18T02:03:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1505.06219","created_at":"2026-05-18T02:03:47Z"},{"alias_kind":"pith_short_12","alias_value":"GR5KSBTRIBAS","created_at":"2026-05-18T12:29:22Z"},{"alias_kind":"pith_short_16","alias_value":"GR5KSBTRIBASWWRJ","created_at":"2026-05-18T12:29:22Z"},{"alias_kind":"pith_short_8","alias_value":"GR5KSBTR","created_at":"2026-05-18T12:29:22Z"}],"graph_snapshots":[{"event_id":"sha256:28d68907e3934c9c393a300091e71ac6dca2aef03d2a1fe899aea493ce20aec6","target":"graph","created_at":"2026-05-18T02:03:47Z","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":"In this paper, a comparative study between proposed hyper kurtosis based modified duo-histogram equalization (HKMDHE) algorithm and contrast limited adaptive histogram enhancement (CLAHE) has been presented for the implementation of contrast enhancement and brightness preservation of low contrast human brain CT scan images. In HKMDHE algorithm, contrast enhancement is done on the hyper-kurtosis based application. The results are very promising of proposed HKMDHE technique with improved PSNR values and lesser AMMBE values than CLAHE technique.","authors_text":"Nirmalya Ghosh, Prasanta K. Panigrahi, Ritwik Burman, Sabyasachi Mukhopadhyay, Satyasaran Changdar, Sawon Pratiher, Soham Mandal","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2015-04-07T01:26:06Z","title":"A comparative study between proposed Hyper Kurtosis based Modified Duo-Histogram Equalization (HKMDHE) and Contrast Limited Adaptive Histogram Equalization (CLAHE) for Contrast Enhancement Purpose of Low Contrast Human Brain CT scan images"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.06219","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:b3caa05fae68ead58ac7c1fcfb847c052b4510bda39dfd6cdd00e0c416b808e4","target":"record","created_at":"2026-05-18T02:03:47Z","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":"07cf47ee550ac8ce55ab86fd03a79c470a1ad70c0f5177e7f6b8220d6aced428","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2015-04-07T01:26:06Z","title_canon_sha256":"35cb7aaafce560657bbf45560726334ebd1a6feb1fd41cc782550ece366deedd"},"schema_version":"1.0","source":{"id":"1505.06219","kind":"arxiv","version":1}},"canonical_sha256":"347aa9067140412b5a29b65a0fb342871c1822f5c1fda0ed2126ce90e55dae62","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"347aa9067140412b5a29b65a0fb342871c1822f5c1fda0ed2126ce90e55dae62","first_computed_at":"2026-05-18T02:03:47.922856Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:03:47.922856Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"eafr+w6RS+PCA9/+XPXqoNJIaRtwRCczqZSBGWtKiouU7D1r77FjC/vk/pUuP4H20WH3kjf8K8S0OyYOTATIDw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:03:47.923286Z","signed_message":"canonical_sha256_bytes"},"source_id":"1505.06219","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b3caa05fae68ead58ac7c1fcfb847c052b4510bda39dfd6cdd00e0c416b808e4","sha256:28d68907e3934c9c393a300091e71ac6dca2aef03d2a1fe899aea493ce20aec6"],"state_sha256":"0c7e98313ecfca5ba0ff614a5eddc5a67716decc4cafcc6fec328e7cf1edfb46"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jFVbqvyAVh4GBYKuAxFYAEkvWVOcTsTFYubHRDtkJ2ROeKvUgdt6mDxnxPkCqj9sRh4eiciIEDrzSAc/ifIKDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T16:56:01.148703Z","bundle_sha256":"0970f9e0cbb654eb121652588bd33d357f33715e48356b9554ac5d056d029aa0"}}