Vision Framework API Reference

Comprehensive reference for Vision framework computer vision: subject segmentation, hand/body pose detection, person detection, face analysis, text recognition (OCR), barcode detection, and document scanning.

When to Use This Reference

• Implementing subject lifting using VisionKit or Vision
• Detecting hand/body poses for gesture recognition or fitness apps
• Segmenting people from backgrounds or separating multiple individuals
• Face detection and landmarks for AR effects or authentication
• Combining Vision APIs to solve complex computer vision problems
• Looking up specific API signatures and parameter meanings
• Recognizing text in images (OCR) with VNRecognizeTextRequest
• Detecting barcodes and QR codes with VNDetectBarcodesRequest
• Building live scanners with DataScannerViewController
• Scanning documents with VNDocumentCameraViewController
• Extracting structured document data with RecognizeDocumentsRequest (iOS 26+)

Related skills: See axiom-vision for decision trees and patterns, axiom-vision-diag for troubleshooting