已有认证识别基本功能，暂未支持高并发
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app/services.py
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215
app/services.py
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import cv2
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import numpy as np
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from insightface.app import FaceAnalysis
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from . import database
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import base64
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import requests
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class FaceRecognitionService:
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def __init__(self):
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# 初始化InsightFace分析器
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self.app = FaceAnalysis(name="buffalo_l", providers=['CPUExecutionProvider'])
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self.app.prepare(ctx_id=0, det_size=(640, 640))
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def _decode_image(self, image_source):
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"""从URL或Base64解码图片"""
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img = None
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if image_source.face_data:
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try:
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img_data = base64.b64decode(image_source.face_data)
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nparr = np.frombuffer(img_data, np.uint8)
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img = cv2.imdecode(nparr, cv2.IMREAD_COLOR)
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except Exception as e:
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raise ValueError(f"Base64解码失败: {e}")
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elif image_source.url:
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try:
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response = requests.get(image_source.url, timeout=10)
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response.raise_for_status()
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img_array = np.asarray(bytearray(response.content), dtype=np.uint8)
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img = cv2.imdecode(img_array, cv2.IMREAD_COLOR)
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except Exception as e:
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raise ValueError(f"从URL获取图片失败: {e}")
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if img is None:
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raise ValueError("无法加载图片")
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return img
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def register_new_face(self, user_id: int, name: str, image_source):
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"""注册新的人脸"""
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with database.get_db_connection() as conn:
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cursor = conn.cursor()
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# 1. 检查ID是否已存在
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cursor.execute("SELECT * FROM users WHERE id = ?", (user_id,))
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user = cursor.fetchone()
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if user and user['name'] != name:
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raise ValueError(f"ID {user_id} 已被 '{user['name']}' 注册，无法更改为 '{name}'。")
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# 2. 解码和处理图片
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image = self._decode_image(image_source)
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faces = self.app.get(image)
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if not faces:
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raise ValueError("图片中未检测到人脸。")
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if len(faces) > 1:
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raise ValueError("注册图片中只能包含一张人脸。")
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embedding = faces[0].embedding
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# 3. 存储到数据库
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if not user:
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# 如果是新用户，先在users表创建记录
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cursor.execute("INSERT INTO users (id, name) VALUES (?, ?)", (user_id, name))
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# 插入新的人脸特征
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cursor.execute("INSERT INTO face_features (user_id, embedding) VALUES (?, ?)", (user_id, embedding.tobytes()))
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conn.commit()
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# 4. 返回用户信息
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cursor.execute("SELECT COUNT(*) FROM face_features WHERE user_id = ?", (user_id,))
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count = cursor.fetchone()[0]
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return {"id": user_id, "name": name, "registered_faces_count": count}
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def detect_faces(self, image_source):
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"""1:N 人脸识别"""
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image = self._decode_image(image_source)
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detected_faces = self.app.get(image)
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if not detected_faces:
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return []
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with database.get_db_connection() as conn:
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cursor = conn.cursor()
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cursor.execute("SELECT user_id, embedding FROM face_features")
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db_features = cursor.fetchall()
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if not db_features:
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# 如果数据库为空，所有检测到的人脸都是未知的
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# (此处简化处理，实际可返回带位置的未知人脸列表)
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return []
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# 将数据库特征加载到Numpy数组中以便快速计算
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db_user_ids = np.array([f['user_id'] for f in db_features])
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db_embeddings = np.array([np.frombuffer(f['embedding'], dtype=np.float32) for f in db_features])
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results = []
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for face in detected_faces:
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embedding = face.embedding
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# 计算与数据库中所有特征的余弦相似度
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# (insightface的特征是归一化的，点积等价于余弦相似度)
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similarities = np.dot(db_embeddings, embedding)
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best_match_index = np.argmax(similarities)
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best_similarity = similarities[best_match_index]
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# 设置一个阈值来判断是否为已知人脸
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# ArcFace 官方建议的阈值通常在 0.4 到 0.6 之间，这里我们用0.5
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RECOGNITION_THRESHOLD = 0.5
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if best_similarity > RECOGNITION_THRESHOLD:
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matched_user_id = db_user_ids[best_match_index]
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# 查询用户信息
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cursor.execute("SELECT name, (SELECT COUNT(*) FROM face_features WHERE user_id=?) FROM users WHERE id=?", (matched_user_id, matched_user_id))
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user_info = cursor.fetchone()
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x1, y1, x2, y2 = face.bbox.astype(int)
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results.append({
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"id": matched_user_id,
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"name": user_info['name'],
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"registered_faces_count": user_info[2],
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"confidence": float(best_similarity),
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"location": {"x": x1, "y": y1, "width": x2 - x1, "height": y2 - y1}
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})
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return results
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def verify_face(self, user_id: int, image_source):
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"""1:1 人脸认证"""
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# 1. 解码图片并检测人脸
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image = self._decode_image(image_source)
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detected_faces = self.app.get(image)
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if not detected_faces:
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raise ValueError("图片中未检测到人脸。")
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if len(detected_faces) > 1:
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raise ValueError("用于认证的图片中只能包含一张人脸。")
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embedding = detected_faces[0].embedding
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# 2. 从数据库获取该ID对应的所有人脸特征
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with database.get_db_connection() as conn:
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cursor = conn.cursor()
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cursor.execute("SELECT embedding FROM face_features WHERE user_id = ?", (user_id,))
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db_features = cursor.fetchall()
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if not db_features:
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raise ValueError(f"数据库中不存在ID为 {user_id} 的用户，或该用户未注册任何人脸。")
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db_embeddings = np.array([np.frombuffer(f['embedding'], dtype=np.float32) for f in db_features])
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# 3. 计算与该ID所有特征的相似度，取最高值
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similarities = np.dot(db_embeddings, embedding)
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best_similarity = np.max(similarities)
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# 1:1 认证通常使用比 1:N 更严格的阈值
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VERIFICATION_THRESHOLD = 0.6
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match = bool(best_similarity > VERIFICATION_THRESHOLD)
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return {"match": match, "confidence": float(best_similarity)}
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def delete_user(self, user_id: int):
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"""根据ID删除用户及其所有的人脸数据"""
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with database.get_db_connection() as conn:
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cursor = conn.cursor()
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cursor.execute("SELECT name FROM users WHERE id = ?", (user_id,))
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user = cursor.fetchone()
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if not user:
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raise ValueError(f"ID为 {user_id} 的用户不存在。")
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# 使用了外键的 ON DELETE CASCADE，删除users表中的记录会自动删除face_features中的相关记录
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cursor.execute("DELETE FROM users WHERE id = ?", (user_id,))
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conn.commit()
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# cursor.rowcount 在 SQLite 中可能不总是可靠，我们确认用户存在即认为删除成功
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return {"id": user_id, "name": user['name']}
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def get_user(self, user_id: int):
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"""根据ID获取用户信息"""
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with database.get_db_connection() as conn:
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cursor = conn.cursor()
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cursor.execute("SELECT id, name, (SELECT COUNT(*) FROM face_features WHERE user_id=?) FROM users WHERE id=?", (user_id, user_id))
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user = cursor.fetchone()
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if not user:
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return None
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return {"id": user['id'], "name": user['name'], "registered_faces_count": user[2]}
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def list_all_users(self, skip: int = 0, limit: int = 100):
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"""列出所有已注册的用户，支持分页"""
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with database.get_db_connection() as conn:
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cursor = conn.cursor()
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cursor.execute("""
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SELECT u.id, u.name, COUNT(f.feature_id) as face_count
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FROM users u
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LEFT JOIN face_features f ON u.id = f.user_id
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GROUP BY u.id, u.name
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ORDER BY u.id
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LIMIT ? OFFSET ?
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""", (limit, skip))
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users = cursor.fetchall()
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return [{"id": u['id'], "name": u['name'], "registered_faces_count": u['face_count']} for u in users]
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# 在文件末尾实例化服务，方便API层调用
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face_service = FaceRecognitionService()
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