axiom-ios-vision

# iOS Computer Vision Router

**You MUST use this skill for ANY computer vision work using the Vision framework.**

## When to Use

Use this router when:
- Analyzing images or video
- Detecting objects, faces, or people
- Tracking hand or body pose
- Segmenting people or subjects
- Lifting subjects from backgrounds
- Recognizing text in images (OCR)
- Detecting barcodes or QR codes
- Scanning documents
- Using VisionKit or DataScannerViewController

## Routing Logic

### Vision Work

**Implementation patterns** → `/skill axiom-vision`
- Subject segmentation (VisionKit)
- Hand pose detection (21 landmarks)
- Body pose detection (2D/3D)
- Person segmentation
- Face detection
- Isolating objects while excluding hands
- Text recognition (VNRecognizeTextRequest)
- Barcode/QR detection (VNDetectBarcodesRequest)
- Document scanning (VNDocumentCameraViewController)
- Live scanning (DataScannerViewController)
- Structured document extraction (RecognizeDocumentsRequest, iOS 26+)

**API reference** → `/skill axiom-vision-ref`
- Complete Vision framework API
- VNDetectHumanHandPoseRequest
- VNDetectHumanBodyPoseRequest
- VNGenerateForegroundInstanceMaskRequest
- VNRecognizeTextRequest (fast/accurate modes)
- VNDetectBarcodesRequest (symbologies)
- DataScannerViewController delegates
- RecognizeDocumentsRequest (iOS 26+)
- Coordinate conversion patterns

**Diagnostics** → `/skill axiom-vision-diag`
- Subject not detected
- Hand pose missing landmarks
- Low confidence observations
- Performance issues
- Coordinate conversion bugs
- Text not recognized or wrong characters
- Barcodes not detected
- DataScanner showing blank or no items
- Document edges not detected

## Decision Tree

```
User asks about computer vision
  ├─ Implementing?
  │   ├─ Pose detection (hand/body)? → vision
  │   ├─ Subject segmentation? → vision
  │   ├─ Text recognition/OCR? → vision
  │   ├─ Barcode/QR scanning? → vision
  │   ├─ Document scanning? → vision
  │   └─ Live camera scanning? → vision (DataS