mirror of
https://github.com/yakhyo/uniface.git
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299 lines
7.0 KiB
Markdown
299 lines
7.0 KiB
Markdown
# Recognition
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Face recognition extracts embeddings for identity verification and face search.
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---
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## Available Models
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| Model | Backbone | Size | Embedding Dim |
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|-------|----------|------|---------------|
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| **AdaFace** | IR-18/IR-101 | 92-249 MB | 512 |
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| **ArcFace** | MobileNet/ResNet | 8-166 MB | 512 |
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| **MobileFace** | MobileNet V2/V3 | 1-10 MB | 512 |
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| **SphereFace** | Sphere20/36 | 50-92 MB | 512 |
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---
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## AdaFace
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Face recognition using adaptive margin based on image quality.
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### Basic Usage
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```python
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from uniface import RetinaFace, AdaFace
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detector = RetinaFace()
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recognizer = AdaFace()
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# Detect face
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faces = detector.detect(image)
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# Extract embedding
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if faces:
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embedding = recognizer.get_normalized_embedding(image, faces[0].landmarks)
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print(f"Embedding shape: {embedding.shape}") # (1, 512)
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```
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### Model Variants
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```python
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from uniface import AdaFace
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from uniface.constants import AdaFaceWeights
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# Lightweight (default)
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recognizer = AdaFace(model_name=AdaFaceWeights.IR_18)
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# High accuracy
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recognizer = AdaFace(model_name=AdaFaceWeights.IR_101)
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# Force CPU execution
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recognizer = AdaFace(providers=['CPUExecutionProvider'])
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```
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| Variant | Dataset | Size | IJB-B | IJB-C |
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|---------|---------|------|-------|-------|
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| **IR_18** :material-check-circle: | WebFace4M | 92 MB | 93.03% | 94.99% |
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| IR_101 | WebFace12M | 249 MB | - | 97.66% |
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!!! info "Benchmark Metrics"
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IJB-B and IJB-C accuracy reported as TAR@FAR=0.01%
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---
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## ArcFace
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Face recognition using additive angular margin loss.
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### Basic Usage
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```python
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from uniface import RetinaFace, ArcFace
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detector = RetinaFace()
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recognizer = ArcFace()
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# Detect face
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faces = detector.detect(image)
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# Extract embedding
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if faces:
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embedding = recognizer.get_normalized_embedding(image, faces[0].landmarks)
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print(f"Embedding shape: {embedding.shape}") # (1, 512)
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```
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### Model Variants
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```python
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from uniface import ArcFace
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from uniface.constants import ArcFaceWeights
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# Lightweight (default)
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recognizer = ArcFace(model_name=ArcFaceWeights.MNET)
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# High accuracy
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recognizer = ArcFace(model_name=ArcFaceWeights.RESNET)
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# Force CPU execution
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recognizer = ArcFace(providers=['CPUExecutionProvider'])
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```
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| Variant | Backbone | Size | LFW | CFP-FP | AgeDB-30 | IJB-C |
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|---------|----------|------|-----|--------|----------|-------|
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| **MNET** :material-check-circle: | MobileNet | 8 MB | 99.70% | 98.00% | 96.58% | 95.02% |
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| RESNET | ResNet50 | 166 MB | 99.83% | 99.33% | 98.23% | 97.25% |
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!!! info "Training Data & Metrics"
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**Dataset**: Trained on WebFace600K (600K images)
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**Accuracy**: IJB-C reported as TAR@FAR=1e-4
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---
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## MobileFace
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Lightweight face recognition models with MobileNet backbones.
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### Basic Usage
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```python
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from uniface import MobileFace
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recognizer = MobileFace()
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embedding = recognizer.get_normalized_embedding(image, landmarks)
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```
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### Model Variants
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```python
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from uniface import MobileFace
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from uniface.constants import MobileFaceWeights
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# Ultra-lightweight
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recognizer = MobileFace(model_name=MobileFaceWeights.MNET_025)
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# Balanced (default)
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recognizer = MobileFace(model_name=MobileFaceWeights.MNET_V2)
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# Higher accuracy
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recognizer = MobileFace(model_name=MobileFaceWeights.MNET_V3_LARGE)
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```
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| Variant | Params | Size | LFW | CALFW | CPLFW | AgeDB-30 |
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|---------|--------|------|-----|-------|-------|----------|
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| MNET_025 | 0.36M | 1 MB | 98.76% | 92.02% | 82.37% | 90.02% |
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| **MNET_V2** :material-check-circle: | 2.29M | 4 MB | 99.55% | 94.87% | 86.89% | 95.16% |
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| MNET_V3_SMALL | 1.25M | 3 MB | 99.30% | 93.77% | 85.29% | 92.79% |
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| MNET_V3_LARGE | 3.52M | 10 MB | 99.53% | 94.56% | 86.79% | 95.13% |
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---
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## SphereFace
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Face recognition using angular softmax loss (A-Softmax).
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### Basic Usage
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```python
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from uniface import SphereFace
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from uniface.constants import SphereFaceWeights
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recognizer = SphereFace(model_name=SphereFaceWeights.SPHERE20)
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embedding = recognizer.get_normalized_embedding(image, landmarks)
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```
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| Variant | Params | Size | LFW | CALFW | CPLFW | AgeDB-30 |
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|---------|--------|------|-----|-------|-------|----------|
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| SPHERE20 | 24.5M | 50 MB | 99.67% | 95.61% | 88.75% | 96.58% |
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| SPHERE36 | 34.6M | 92 MB | 99.72% | 95.64% | 89.92% | 96.83% |
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---
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## Face Comparison
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### Compute Similarity
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```python
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from uniface import compute_similarity
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import numpy as np
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# Extract embeddings
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emb1 = recognizer.get_normalized_embedding(image1, landmarks1)
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emb2 = recognizer.get_normalized_embedding(image2, landmarks2)
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# Method 1: Using utility function
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similarity = compute_similarity(emb1, emb2)
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# Method 2: Direct computation
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similarity = np.dot(emb1, emb2.T)[0][0]
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print(f"Similarity: {similarity:.4f}")
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```
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### Threshold Guidelines
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| Threshold | Decision | Use Case |
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|-----------|----------|----------|
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| > 0.7 | Very high confidence | Security-critical |
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| > 0.6 | Same person | General verification |
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| 0.4 - 0.6 | Uncertain | Manual review needed |
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| < 0.4 | Different people | Rejection |
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---
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## Face Alignment
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Recognition models require aligned faces. UniFace handles this internally:
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```python
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# Alignment is done automatically
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embedding = recognizer.get_normalized_embedding(image, landmarks)
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# Or manually align
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from uniface import face_alignment
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aligned_face = face_alignment(image, landmarks)
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# Returns: 112x112 aligned face image
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```
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---
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## Building a Face Database
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```python
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import numpy as np
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from uniface import RetinaFace, ArcFace
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detector = RetinaFace()
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recognizer = ArcFace()
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# Build database
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database = {}
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for person_id, image_path in person_images.items():
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image = cv2.imread(image_path)
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faces = detector.detect(image)
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if faces:
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embedding = recognizer.get_normalized_embedding(image, faces[0].landmarks)
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database[person_id] = embedding
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# Save for later use
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np.savez('face_database.npz', **database)
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# Load database
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data = np.load('face_database.npz')
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database = {key: data[key] for key in data.files}
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```
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---
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## Face Search
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Find a person in a database:
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```python
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def search_face(query_embedding, database, threshold=0.6):
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"""Find best match in database."""
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best_match = None
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best_similarity = -1
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for person_id, db_embedding in database.items():
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similarity = np.dot(query_embedding, db_embedding.T)[0][0]
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if similarity > best_similarity and similarity > threshold:
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best_similarity = similarity
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best_match = person_id
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return best_match, best_similarity
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# Usage
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query_embedding = recognizer.get_normalized_embedding(query_image, landmarks)
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match, similarity = search_face(query_embedding, database)
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if match:
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print(f"Found: {match} (similarity: {similarity:.4f})")
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else:
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print("No match found")
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```
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---
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## Factory Function
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```python
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from uniface import create_recognizer
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# Available methods: 'arcface', 'adaface', 'mobileface', 'sphereface'
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recognizer = create_recognizer('arcface')
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recognizer = create_recognizer('adaface')
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```
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---
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## See Also
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- [Detection Module](detection.md) - Detect faces first
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- [Face Search Recipe](../recipes/face-search.md) - Complete search system
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- [Thresholds](../concepts/thresholds-calibration.md) - Calibration guide
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