{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:CAPNO4DJNLGU4MQKA5XPP3YDWJ","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":"2e316a8904dbf300a4b69ca49534f13644a2afc254ef61616cb8fec3d9edd111","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2017-01-17T03:27:56Z","title_canon_sha256":"46cef9428a4cdf8198f12317ea77e920cd2c84cdcef037965d08553b8fdcc100"},"schema_version":"1.0","source":{"id":"1701.04520","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1701.04520","created_at":"2026-05-18T00:52:43Z"},{"alias_kind":"arxiv_version","alias_value":"1701.04520v1","created_at":"2026-05-18T00:52:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1701.04520","created_at":"2026-05-18T00:52:43Z"},{"alias_kind":"pith_short_12","alias_value":"CAPNO4DJNLGU","created_at":"2026-05-18T12:31:10Z"},{"alias_kind":"pith_short_16","alias_value":"CAPNO4DJNLGU4MQK","created_at":"2026-05-18T12:31:10Z"},{"alias_kind":"pith_short_8","alias_value":"CAPNO4DJ","created_at":"2026-05-18T12:31:10Z"}],"graph_snapshots":[{"event_id":"sha256:e799bc1a5b1c0b09c1dfe8b373658c9e16eecf48a388682dbe8fb581b7384f57","target":"graph","created_at":"2026-05-18T00:52:43Z","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":"Sky/cloud imaging using ground-based Whole Sky Imagers (WSI) is a cost-effective means to understanding cloud cover and weather patterns. The accurate segmentation of clouds in these images is a challenging task, as clouds do not possess any clear structure. Several algorithms using different color models have been proposed in the literature. This paper presents a systematic approach for the selection of color spaces and components for optimal segmentation of sky/cloud images. Using mainly principal component analysis (PCA) and fuzzy clustering for evaluation, we identify the most suitable col","authors_text":"Soumyabrata Dev, Stefan Winkler, Yee Hui Lee","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2017-01-17T03:27:56Z","title":"Systematic study of color spaces and components for the segmentation of sky/cloud images"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1701.04520","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:d195de2774444ddbf8a87c63f86571d70d16560c506e2ccd78d2e0ba71c3c226","target":"record","created_at":"2026-05-18T00:52:43Z","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":"2e316a8904dbf300a4b69ca49534f13644a2afc254ef61616cb8fec3d9edd111","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2017-01-17T03:27:56Z","title_canon_sha256":"46cef9428a4cdf8198f12317ea77e920cd2c84cdcef037965d08553b8fdcc100"},"schema_version":"1.0","source":{"id":"1701.04520","kind":"arxiv","version":1}},"canonical_sha256":"101ed770696acd4e320a076ef7ef03b25e1ff31df9e66ecd7e1cd459225ca1b5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"101ed770696acd4e320a076ef7ef03b25e1ff31df9e66ecd7e1cd459225ca1b5","first_computed_at":"2026-05-18T00:52:43.449326Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:52:43.449326Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tLUHko+6DrMgc8kJWTQ6Jke/hK3t/y55MlmoppUWN1jdDBpwDo8SsDTqzyZ4Y27BzNIHRqgdtyEyqdYkGHGwAg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:52:43.449849Z","signed_message":"canonical_sha256_bytes"},"source_id":"1701.04520","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d195de2774444ddbf8a87c63f86571d70d16560c506e2ccd78d2e0ba71c3c226","sha256:e799bc1a5b1c0b09c1dfe8b373658c9e16eecf48a388682dbe8fb581b7384f57"],"state_sha256":"e34ceae58694004193e38355ea69095b590ca297375585f06d51ebc2306766a3"}