Pith Number

pith:K73YQH2L

pith:2026:K73YQH2L2YHUMZFSXGOOWPHQQR

not attested not anchored not stored refs pending

Semantic Foam: Unifying Spatial and Semantic Scene Decomposition

Amr Sharafeldin, Andrea Tagliasacchi, Aryan Mikaeili, Daniel Rebain, Kwang Moo Yi, Shrisudhan Govindarajan, Thomas Walker

Semantic Foam attaches semantic features to Voronoi cells for consistent object segmentation in reconstructed scenes.

arxiv:2604.26262 v3 · 2026-04-29 · cs.CV

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{K73YQH2L2YHUMZFSXGOOWPHQQR}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Claims

C1strongest claim

Our approach integrates the natural spatial volumetric decomposition of Radiant Foam's Voronoi mesh with an explicit semantic feature field parameterized at the cell level. This explicit structure enables direct spatial regularization, which prevents artifacts caused by occlusion or inconsistent supervision across views - common pitfalls for other point-based representations.

C2weakest assumption

That attaching semantic features to the Voronoi cells of Radiant Foam will preserve rendering quality while delivering consistent segmentation without new artifacts or loss of detail from the underlying spatial decomposition.

C3one line summary

Semantic Foam unifies spatial Voronoi decomposition with cell-level semantic features to achieve superior object segmentation by enabling direct spatial regularization that avoids occlusion and view-inconsistency artifacts.

Receipt and verification

First computed	2026-06-01T01:02:40.750959Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

57f7881f4bd60f4664b2b99ceb3cf08451a8f0deb167451c905fee63e28fd617

Aliases

arxiv: 2604.26262 · arxiv_version: 2604.26262v3 · doi: 10.48550/arxiv.2604.26262 · pith_short_12: K73YQH2L2YHU · pith_short_16: K73YQH2L2YHUMZFS · pith_short_8: K73YQH2L

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/K73YQH2L2YHUMZFSXGOOWPHQQR \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 57f7881f4bd60f4664b2b99ceb3cf08451a8f0deb167451c905fee63e28fd617

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b70b2e6766b4dd7c53e17c7bc5189ff7d08ffc07a3026230793c67baa8b3515a",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CV",
    "submitted_at": "2026-04-29T03:40:13Z",
    "title_canon_sha256": "f3987ec03f1b2fb87735c133d9d34e6ff4a698502207a833a50af612de4bc058"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.26262",
    "kind": "arxiv",
    "version": 3
  }
}