Throwaway spike

Air-written digit recognition — feasibility test

Measurement only. No game, no art. One question: can it read the digit?
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Write the answer in the air

A maths question appears. Solve it, then write the answer with your finger — the camera follows your hand.

☝️PointWrite with your index finger
✌️Two fingersLift the pen — move without drawing
✊FistRub it out, like an eraser
🖐️Open palmHold it to check your answer

This is an early test version. Nothing you write leaves your device.

Round

Write this:
—
Read as:
—
Score 0 / 0
☝️Index — write
✌️Two — pen up
✊Fist — erase
🖐️Palm — check
No timer any more. Nothing is submitted until you show an open palm.

Accuracy

Attempts0
Correct0
Wrong0
Unsure (asked to retry)0
Accuracy when it answered—
Accuracy strict (unsure = wrong)—
Strokes last attempt—
Go/no-go for the full product: ≥90%
Higher = more cautious, asks to retry more often instead of guessing wrong.

Teach mode

Record how you write each digit. Biggest accuracy lever there is.
Walks you through 0–9 three times. Fastest way to teach it your handwriting.
Your templates0

Confusion matrix

Rows = what you wrote. Columns = what it read.

How to test

  1. Write a 4 or a 5 — lift the pen with ✌️ between strokes. Does the ink look clean now?
  2. Check each gesture switches reliably. Watch the four chips above.
  3. 30–50 attempts. Note the accuracy.
  4. If low, turn Teach ON, record 5 samples per digit, reset stats, 50 more.
  5. Test with a real 6–8 year old if you can.
  6. Export the JSON and show me the numbers.