Computer vision · checklist · HITL

field-inspection-report

Synthetic site photos become annotated evidence and PASS / REVIEW / FAIL checklist verdicts, with uncertain detections routed to a person.

Public · synthetic demo

The problem

Bounding boxes are not a signed-off inspection.

An inspection team needs required items checked, hazards stated in plain language, and borderline calls isolated for review—not a detector's raw box dump.

Input

Six fictional safety scenes

Required: hardhat · safety vest · fire extinguisher · safety cone
Forbidden: spill / hazard
Confidence gate: 0.55
Offline detector: HSV threshold + connected components

The money shot

Visual evidence with fail-safe routing

Verdicts2 PASS · 1 REVIEW · 3 FAIL

Missing / hazard2 violations · 1 defect

Synthetic detector F11.0

Annotated synthetic compliant scene — scene_01 · PASS — all required items detected confidently.

Annotated synthetic scene missing a hardhat — scene_02 · FAIL — hardhat missing.

Annotated synthetic spill-hazard scene — scene_03 · FAIL — hazard_spill detected at 1.00.

Annotated synthetic low-confidence faded vest scene — scene_05 · REVIEW — safety vest confidence 0.45 is below the 0.55 gate.

Scene	Signal	Route
01 compliant	All four required items	PASS
02 missing hardhat	Required item absent	FAIL
03 spill hazard	hazard_spill 1.00	FAIL
05 faded vest	safety_vest 0.45 < 0.55	HUMAN REVIEW

How it's verified

The detector is replaceable; the checklist is stable.

Detected objects are matched against required and forbidden classes, low-confidence calls enter review_queue.csv, and every scene receives one verdict. The same interface can swap the synthetic color detector for YOLO or a hosted vision model without changing the gate.

Honest limitations

Scenes are fictional colored shapes, not real construction photos.
Precision, recall, and F1 equal 1.0 only on these clean synthetic scenes; real lighting, occlusion, and look-alikes are harder.
The confidence threshold is a business dial and must be calibrated on representative data.
A production inspector remains responsible for consequential safety decisions.