Pith Number

pith:VMYVR744

pith:2026:VMYVR744XHUKTXFTIFKKEWFVT7

not attested not anchored not stored refs pending

ICDAR 2026 Competition on Writer Identification and Pen Classification from Hand-Drawn Circles

Fei Wu, Janne van der Loop, Linda-Sophie Schneider, Lukas H\"uttner, Mathias Seuret, Thomas Gorges, Vincent Christlein

Hand-drawn circles contain identifiable traces of both the writer and the pen used.

arxiv:2605.07816 v2 · 2026-05-08 · 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{VMYVR744XHUKTXFTIFKKEWFVT7}

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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

In this large-scale competition, CircleID establishes a new baseline for minimal-trace analysis.

C2weakest assumption

That biometric writer characteristics and physical pen features naturally entangle within minimal, static traces of hand-drawn circles in a way that permits meaningful disentanglement and generalization to unseen writers.

C3one line summary

A new dataset of hand-drawn circles from 66 writers and 8 pens yields competition results of 64.8% top-1 accuracy for open-set writer identification and 92.7% for pen classification.

Receipt and verification

First computed	2026-05-21T02:05:04.672035Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ab3158ff9cb9e8a9dcb34154a258b59fdb96222b56c4d84d6031ba98a7b80aca

Aliases

arxiv: 2605.07816 · arxiv_version: 2605.07816v2 · doi: 10.48550/arxiv.2605.07816 · pith_short_12: VMYVR744XHUK · pith_short_16: VMYVR744XHUKTXFT · pith_short_8: VMYVR744

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/VMYVR744XHUKTXFTIFKKEWFVT7 \
  | 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: ab3158ff9cb9e8a9dcb34154a258b59fdb96222b56c4d84d6031ba98a7b80aca

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6e518a24fe48dd1e4cc31ec8d0b38c2766bbaeb343bc1b9390d518a33dec965d",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CV",
    "submitted_at": "2026-05-08T14:48:57Z",
    "title_canon_sha256": "2ed599984eb3fe3497a01e0122a8c2da0c312f2463fc9595f5c909825ba6d307"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.07816",
    "kind": "arxiv",
    "version": 2
  }
}