Pith Number

pith:VKSSRJO2

pith:2020:VKSSRJO22KK7G7SGCMTXXWI3X3

not attested not anchored not stored refs pending

A Robust Color Edge Detection Algorithm Based on Quaternion Hardy Filter

Dong Cheng, Kit Ian Kou, Wenshan Bi

arxiv:2001.01800 v2 · 2020-01-06 · eess.SP · math.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{VKSSRJO22KK7G7SGCMTXXWI3X3}

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.

Receipt and verification

First computed	2026-07-05T01:26:08.011534Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

aaa528a5dad295f37e4613277bd91bbec52f22dcc0d64945b76b3e8d1891eecb

Aliases

arxiv: 2001.01800 · arxiv_version: 2001.01800v2 · doi: 10.48550/arxiv.2001.01800 · pith_short_12: VKSSRJO22KK7 · pith_short_16: VKSSRJO22KK7G7SG · pith_short_8: VKSSRJO2

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/VKSSRJO22KK7G7SGCMTXXWI3X3 \
  | 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: aaa528a5dad295f37e4613277bd91bbec52f22dcc0d64945b76b3e8d1891eecb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9e718d8cf9112100d7ddfe85c8b6249fc0e976a39818a3198320100f42448789",
    "cross_cats_sorted": [
      "math.CV"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "eess.SP",
    "submitted_at": "2020-01-06T22:35:42Z",
    "title_canon_sha256": "d6f7effe59b09b9c4793b32c63068e1bd27ccb501cd93dab60011557f80d58e4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2001.01800",
    "kind": "arxiv",
    "version": 2
  }
}