187 lines
5.6 KiB
Python
187 lines
5.6 KiB
Python
import os
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import cv2
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import gc
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import time
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import threading
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from rapidocr import RapidOCR
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from service.sensitive_service import get_all_sensitive_words
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# 全局变量
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_ocr_engine = None
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_forbidden_words = set()
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_conf_threshold = 0.5
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ocr_config_path = os.path.join(os.path.dirname(__file__), "config", "config.yaml")
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# 资源管理变量
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_ref_count = 0
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_last_used_time = 0
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_lock = threading.Lock()
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_release_timeout = 5 # 30秒无使用则释放
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_is_releasing = False # 标记是否正在释放
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# 调试用计数器
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_debug_counter = {
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"created": 0,
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"released": 0,
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"detected": 0
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}
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def _release_engine():
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"""释放OCR引擎资源"""
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global _ocr_engine, _is_releasing
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if not _ocr_engine or _is_releasing:
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return
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try:
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_is_releasing = True
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# 如果有释放方法则调用
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if hasattr(_ocr_engine, 'release'):
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_ocr_engine.release()
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_ocr_engine = None
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_debug_counter["released"] += 1
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print(f"OCR engine released. Stats: {_debug_counter}")
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# 清理GPU缓存
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gc.collect()
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try:
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import torch
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if torch.cuda.is_available():
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torch.cuda.empty_cache()
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torch.cuda.ipc_collect()
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except ImportError:
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pass
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try:
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import tensorflow as tf
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tf.keras.backend.clear_session()
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except ImportError:
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pass
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finally:
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_is_releasing = False
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def _monitor_thread():
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"""监控线程，优化检查逻辑"""
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global _ref_count, _last_used_time, _ocr_engine
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while True:
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time.sleep(5) # 每5秒检查一次
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with _lock:
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# 只有当引擎存在、没有引用且超时，才释放
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if _ocr_engine and _ref_count == 0 and not _is_releasing:
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elapsed = time.time() - _last_used_time
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if elapsed > _release_timeout:
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print(f"Idle timeout ({elapsed:.1f}s > {_release_timeout}s), releasing engine")
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_release_engine()
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def load_model():
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"""加载违禁词列表和初始化监控线程"""
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global _forbidden_words
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# 确保监控线程只启动一次
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if not any(t.name == "OCRMonitor" for t in threading.enumerate()):
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threading.Thread(target=_monitor_thread, daemon=True, name="OCRMonitor").start()
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print("OCR monitor thread started")
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# 加载违禁词
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try:
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_forbidden_words = get_all_sensitive_words()
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print(f"Loaded {len(_forbidden_words)} forbidden words")
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except Exception as e:
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print(f"Forbidden words load error: {e}")
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return False
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# 验证配置文件
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if not os.path.exists(ocr_config_path):
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print(f"OCR config not found: {ocr_config_path}")
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return False
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return True
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def detect(frame):
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"""OCR检测，优化引用计数管理"""
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global _ocr_engine, _forbidden_words, _conf_threshold, _ref_count, _last_used_time
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# 验证前置条件
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if not _forbidden_words:
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return (False, "违禁词未初始化")
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if frame is None or frame.size == 0:
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return (False, "无效帧数据")
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if not os.path.exists(ocr_config_path):
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return (False, f"OCR配置文件不存在: {ocr_config_path}")
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# 增加引用计数并获取引擎实例
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engine = None
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with _lock:
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_ref_count += 1
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_last_used_time = time.time()
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_debug_counter["detected"] += 1
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# 初始化引擎（如果未初始化且不在释放中）
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if not _ocr_engine and not _is_releasing:
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try:
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_ocr_engine = RapidOCR(config_path=ocr_config_path)
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_debug_counter["created"] += 1
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print(f"OCR engine initialized. Stats: {_debug_counter}")
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except Exception as e:
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print(f"OCR model load failed: {e}")
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_ref_count -= 1 # 恢复引用计数
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return (False, f"引擎初始化失败: {str(e)}")
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# 获取当前引擎引用
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engine = _ocr_engine
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# 检查引擎是否可用
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if not engine:
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with _lock:
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_ref_count -= 1
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return (False, "OCR引擎不可用")
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try:
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# 执行OCR检测
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ocr_res = engine(frame)
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# 验证OCR结果格式
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if not ocr_res or not hasattr(ocr_res, 'txts') or not hasattr(ocr_res, 'scores'):
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return (False, "无OCR结果")
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# 处理OCR结果
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texts = [t.strip() for t in ocr_res.txts if t and isinstance(t, str)]
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confs = [c for c in ocr_res.scores if c and isinstance(c, (int, float))]
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if len(texts) != len(confs):
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return (False, "OCR结果格式异常")
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# 筛选违禁词
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vio_info = []
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for txt, conf in zip(texts, confs):
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if conf < _conf_threshold:
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continue
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matched = [w for w in _forbidden_words if w in txt]
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if matched:
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vio_info.append(f"文本: '{txt}' 包含违禁词: {', '.join(matched)} (置信度: {conf:.2f})")
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# 构建结果
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has_text = len(texts) > 0
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has_violation = len(vio_info) > 0
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if not has_text:
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return (False, "未识别到文本")
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elif has_violation:
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return (True, "; ".join(vio_info))
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else:
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return (False, "未检测到违禁词")
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except Exception as e:
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print(f"OCR detect error: {e}")
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return (False, f"检测错误: {str(e)}")
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finally:
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# 减少引用计数，确保线程安全
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with _lock:
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_ref_count = max(0, _ref_count - 1)
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# 持续使用时更新最后使用时间
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if _ref_count > 0:
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_last_used_time = time.time()
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