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 (DataScannerViewController) ├─ Need API reference? → vision-ref └─ Debugging issues? → vision-diag

Critical Patterns

vision:

• Subject segmentation with VisionKit

• Hand pose detection (21 landmarks)

• Body pose detection (2D/3D, up to 4 people)

• Isolating objects while excluding hands

• CoreImage HDR compositing

• Text recognition (fast vs accurate modes)

• Barcode detection (symbology selection)

• Document scanning with perspective correction

• Live scanning with DataScannerViewController

• Structured document extraction (iOS 26+)

vision-diag:

• Subject detection failures

• Landmark tracking issues

• Performance optimization

• Observation confidence thresholds

• Text recognition failures (language, contrast)

• Barcode detection issues (symbology, distance)

• DataScanner troubleshooting

• Document edge detection problems

Example Invocations

User: "How do I detect hand pose in an image?" → Invoke: /skill axiom-vision

User: "Isolate a subject but exclude the user's hands" → Invoke: /skill axiom-vision

User: "How do I read text from an image?" → Invoke: /skill axiom-vision

User: "Scan QR codes with the camera" → Invoke: /skill axiom-vision

User: "How do I implement document scanning?" → Invoke: /skill axiom-vision

User: "Use DataScannerViewController for live text" → Invoke: /skill axiom-vision

User: "Subject detection isn't working" → Invoke: /skill axiom-vision-diag

User: "Text recognition returns wrong characters" → Invoke: /skill axiom-vision-diag

User: "Barcode not being detected" → Invoke: /skill axiom-vision-diag

User: "Show me VNDetectHumanBodyPoseRequest examples" → Invoke: /skill axiom-vision-ref

User: "What symbologies does VNDetectBarcodesRequest support?" → Invoke: /skill axiom-vision-ref

User: "RecognizeDocumentsRequest API reference" → Invoke: /skill axiom-vision-ref