Measured product lead custody receipt.
github.com/Zer0pa/ZPE-InkRESEARCH-READY
LIVE
PyPI STALE
Ink that knows the hand that wrote.
Stylus stroke codec · ZPE-Ink · PyPI zpe-ink 0.1.1 stale · github.com/Zer0pa/ZPE-Ink
When a stylus draws, the mark carries more than its shape — it carries the pressure of the hand, the angle of the pen, the rhythm of how it moved. That information has always been in digital ink. It has never had a codec that kept it exactly.
ZPE-Ink is a Python .zpink encoder that seals the full stroke — x, y, pressure, tilt, azimuth — and returns it with 0.00 px Hausdorff error on three public handwriting corpora. The hand's rhythm, kept.
01 · THE GAPSTORED, NOT KEPT
Digital ink stores coordinates. it has never had a codec that preserved everything the hand did.
02 · MARKETSADJACENT FORECASTS
Every stylus that captures a stroke moves through these markets; ZPE-Ink is the exact-geometry record underneath them.
03 · VALUE
$6.2B
2030 digital writing instruments; ZPE-Ink is the stroke record three public corpora proved exact.
04 · INSIGHT
A signature keeps more than the mark — the hand's rhythm.
05.1 · CURRENT TECHSTORED AND FLATTENED
A stylus measures pressure and angle dozens of times a second, then a bitmap takes over and flattens the motion into pixels. The hand's rhythm exists in the device for a moment, then disappears into the file.
05.2 · OUR TECHKEEP THE FULL STROKE
ZPE-Ink keeps the full stroke. It seals x, y, pressure, tilt, and azimuth into a CRC-framed .zpink packet and returns every coordinate unchanged — 0.00 px Hausdorff error on UJI, CROHME, and DigiLeTs. Zero-channel suppression raises CROHME mean compression from 1.52× to 1.76× when a device omits tilt. The hand's motion, intact.
05.3 · BENCHMARKSPUBLIC CORPUS DATA
UJI1.61× · 1,364 samples
CROHME1.44× · 90 samples
Hausdorff0.00px
CRCPASSpublic corpus data
Scope: UJI, CROHME, DigiLeTs, MathWriting, QuickDraw. IAM/UNIPEN skipped.
06 · MEASUREMENTCORPUS CHECK SUITE
Five public corpora replay with exact geometry. CRC rejects the rest.
06.1 · COMPARATIVE PERFORMANCESTROKE BYTES PER SAMPLE
Same int32 (x, y, pressure, tilt, azimuth) buffer across every corpus. On the QuickDraw plus CROHME aggregate, .zpink compresses 3.82×, gzip 3.33×, zlib 3.73×. IAM is registration-limited; UNIPEN is host-unavailable.
07 · KEY METRICSMEASURED PUBLIC EVIDENCE
07.1 · UJI
1.61×
vs raw · 1,364 UJI samples
07.2 · CROHME
1.44×
ICFHR package · 90 CROHME samples
07.3 · DIGILETS
1.09×
real corpus · 180 DigiLeTs samples
07.4 · HAUSDORFF
0.00px
all measured corpora · exact roundtrip
07.5 · PYPI
v0.1.1
PyPI stale · next release closes the version skew
08 · STROKE FIDELITYENCODE AND DECODE
A stroke enters. The same stroke exits. 0.0 px proves it.
08.1 · WHAT THE CODEC KEEPSALL FIVE CHANNELS
Committed artifacts show bit-exact encode-decode on generated fixtures: int32 (x, y, pressure, tilt, azimuth) buffers seal into a CRC-framed .zpink packet and exit without coordinate change — 0.00 px Hausdorff error confirmed on UJI, CROHME, DigiLeTs, MathWriting, and QuickDraw. CRC rejects malformed payloads before decode. Zero-channel suppression raises CROHME mean compression from 1.52× to 1.76× without altering decoded strokes — a device that omits tilt or azimuth gets better compression, not worse. Non-Python runtime parity is not claimed beyond static bindings checked across PyO3, WASM, Swift, and C#.
08.2 · HONEST BLOCKER
Honest Blocker ·
Three checks remain open: cutting the next release, passing the harder IAM and UNIPEN corpora (IAM is registration-limited, UNIPEN is host-unavailable), and proving a clean-room rebuild from spec. Today the PyPI package at 0.1.1 sits ahead of its bindings and runtime at 0.1.0 — a version skew the next release closes.
09
INK that keeps the hand.
09.1 · THE AMBITION
The aim is a stroke record that travels — from a tablet to a server to a researcher's workstation to another device entirely — without losing the pressure, the angle, or the rhythm that made the mark a particular person's. Handwriting becomes citable data, not a frozen picture of itself, across the platforms where pens actually write.
09.2 · WHAT WORKS NOW
Working today: 0.00 px Hausdorff error on UJI, CROHME, and DigiLeTs; CRC framing confirmed.
09.3 · WHAT'S STILL OPEN
Open: PyPI 0.1.2 release, hard-corpus pass on IAM and UNIPEN, blind-clone closure, shipped runtime parity.
09.4 · EDUCATION · NEAR-TERM (12–24 MO)
Student handwriting survives the upload
An e-learning platform that stores a million pages of student maths working can keep the hand that wrote them — pressure, hesitation, retraced strokes — not a flattened image. A teacher reviewing late work sees the thinking, not the result.
09.5 · SIGNATURES · NEAR-TERM (12–24 MO)
A signature carries the hand
A bank or notary capturing a signature on a tablet can archive the full stroke dynamics, not a glyph image. Forensic comparison stops being a visual judgment about pixels and becomes a measurable comparison of pressure curves and pen angles across signings.
09.6 · STYLUS PLATFORMS · MID-TERM (24–48 MO)
One stroke packet across devices
A stylus drawing made on an iPad reaches a Windows tablet, a web canvas, and an Android phone without a conversion step that drops tilt or smooths pressure. The note-taking app stops choosing between portability and fidelity.
09.7 · RESEARCH ARCHIVES · MID-TERM (24–48 MO)
Handwriting corpora become jointly searchable
UJI, CROHME, DigiLeTs, and any future corpus on the same exact-geometry codec can be queried as one. A handwriting researcher hunting for a specific letter formation stops running three retrieval pipelines and starts asking one question of one archive.
09.8 · ARCHIVE STANDARD · PARADIGM (48 MO+)
Pen computing acquires a common record
Notes, signatures, sketches, maths, and annotations from any device resolve to the same kind of stroke record. A handwritten archive becomes a citable, retrievable substrate — the way text and code already are — instead of a folder of frozen images that lose the hand.