Vision Tagger

Tag and annotate images using Apple Vision framework (macOS only). Detects faces, bodies, hands, text (OCR), barcodes, objects, scene labels, and saliency regions. Use for image analysis, photo tagging, posture monitoring, or any task requiring computer vision on images.

macOS-native image analysis using Apple's Vision framework. All processing is local — no cloud APIs, no API keys needed.

Requirements

• macOS 12+ (Monterey or later)
• Xcode Command Line Tools
• Python 3 with Pillow

Setup (one-time)

bash

# Install Xcode CLI tools if needed
xcode-select --install

# Install Pillow
pip3 install Pillow

# Compile the Swift binary
cd scripts/
swiftc -O -o image_tagger image_tagger.swift

Usage

Analyze image → JSON

bash

./scripts/image_tagger /path/to/photo.jpg

Output includes:

• faces — bounding boxes, roll/yaw/pitch, landmarks (eyes, nose, mouth)
• bodies — 18 skeleton joints with confidence scores
• hands — 21 joints per hand (left/right)
• text — OCR results with bounding boxes
• labels — scene classification (desk, outdoor, clothing, etc.)
• barcodes — QR codes, UPC, etc.
• saliency — attention and objectness regions

Annotate image with boxes

bash

python3 scripts/annotate_image.py photo.jpg output.jpg

Draws colored boxes:

• 🟢 Green: faces
• 🟠 Orange: body skeleton
• 🟣 Magenta: hands
• 🔵 Cyan: text regions
• 🟡 Yellow: rectangles/objects
• Scene labels at bottom

Python integration

python

import subprocess, json

def analyze(path):
    r = subprocess.run(['./scripts/image_tagger', path], capture_output=True, text=True)
    return json.loads(r.stdout[r.stdout.find('{'):])

tags = analyze('photo.jpg')
print(tags['labels'])  # [{'label': 'desk', 'confidence': 0.85}, ...]
print(tags['faces'])   # [{'bbox': {...}, 'confidence': 0.99, 'yaw': 5.2}]

Example JSON Output

json

{
  "dimensions": {"width": 1920, "height": 1080},
  "faces": [{"bbox": {"x": 0.3, "y": 0.4, "width": 0.15, "height": 0.2}, "confidence": 0.99, "roll": -2, "yaw": 5}],
  "bodies": [{"joints": {"head_joint": {"x": 0.5, "y": 0.7, "confidence": 0.9}, "left_shoulder": {...}}, "confidence": 1}],
  "hands": [{"chirality": "left", "joints": {"VNHLKWRI": {"x": 0.4, "y": 0.3, "confidence": 0.85}}}],
  "text": [{"text": "HELLO", "confidence": 0.95, "bbox": {...}}],
  "labels": [{"label": "outdoor", "confidence": 0.88}, {"label": "sky", "confidence": 0.75}],
  "saliency": {"attentionBased": [{"x": 0.2, "y": 0.1, "width": 0.6, "height": 0.8}]}
}

Detection Capabilities

Feature	Details
Faces	Bounding box, confidence, roll/yaw/pitch angles, 76-point landmarks
Bodies	18 joints: head, neck, shoulders, elbows, wrists, hips, knees, ankles
Hands	21 joints per hand, left/right chirality
Text (OCR)	Recognized text with confidence and bounding boxes
Labels	1000+ scene/object categories (clothing, furniture, outdoor, etc.)
Barcodes	QR, UPC, EAN, Code128, PDF417, Aztec, DataMatrix
Saliency	Attention-based and objectness-based regions

Use Cases

• Photo tagging — Auto-tag photos with detected objects/scenes
• Posture monitoring — Track face/body position for ergonomics
• Document scanning — Extract text from images
• Security — Detect people in camera feeds
• Accessibility — Describe image contents