School Nail Rules

Next Experiment: Real Measurement

Right now AI is making a visual judgement. Later we will add a known-size reference beside the finger, calculate pixels per millimetre, locate the fingertip and nail edges, and compare a calibrated free-edge measurement with the school rule.

IMAGE → REFERENCE SCALE → PIXELS PER MM → FINGERTIP EDGE → NAIL EDGE → FREE EDGE PIXELS → MILLIMETRES → COMPARE WITH SCHOOL RULE

Gemini Vision Experiments

API mode: Interactions
Model: gemini-3.6-flash
Gemini configured: Yes
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Developer vision image:

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Developer / Parent View

Development mode: analysis images are currently being stored on this server for detector improvement. Oldest attempts are automatically removed after 300 records.

Student STEM Lab · Experimental Detectors / Full Hand Detector · Teacher / Presentation Mode · Export Training Dataset

Why doesn't Student Mode automatically find the nail?

Student Mode is collecting the examples that will teach a future AI what a nail looks like. The student's marking is the correct answer, called ground truth.

Ground Truth: The correct answer provided by a person for an AI training example.

20260903_053452_f8d17cb55d2e

Reprocess Original ROI with OpenCV Detector — creates a new linked attempt and preserves this record.

Detector Summary

Attempt ID: 20260903_053452_f8d17cb55d2e

Detector version: 1.1.3-anatomical-nail

Result: Nail candidate detected

Overall confidence: 91

Processing time: 130.3 ms

Finger orientation: 0.17100362741253°

Fingertip confidence: 100

Nail-search dimensions: {"x":81,"y":73,"width":186,"height":87}

Candidates: 8

Best candidate: 82.306937799875

Second candidate: 55.790628364496

Score margin: 26.516309435379

Representation agreement: N/A

Ensemble agreement: N/A

Final nail confidence: 91

Visual Detection Pipeline

Click an image for full-size inspection. Missing stages remain visible so detector versions can be compared.