支持局域网 GPU OCR 服务，配置方式类似 Ollama。

backend/app/core/config.py

@@ -25,6 +25,9 @@ class Settings(BaseSettings):
     OCR_MAX_SIDE: int = 1280
     UPLOAD_MAX_SIDE: int = 2048
     OCR_WARMUP: bool = True
+    OCR_SERVICE_URL: str = ""
+    OCR_API_KEY: str = ""
+    OCR_USE_GPU: bool = False
 
     class Config:
         env_file = ".env"

backend/app/models/user.py

@@ -159,6 +159,7 @@ class SystemSettings(Base):
     openai_base_url: Mapped[str | None] = mapped_column(String(256), nullable=True)
     openai_model: Mapped[str | None] = mapped_column(String(128), nullable=True)
     openai_api_key: Mapped[str | None] = mapped_column(String(512), nullable=True)
+    ocr_service_url: Mapped[str | None] = mapped_column(String(256), nullable=True)
     updated_at: Mapped[datetime] = mapped_column(
         DateTime(timezone=True), default=lambda: datetime.now(timezone.utc)
     )

backend/app/routers/admin.py

@@ -31,6 +31,7 @@ def settings_to_out(row: SystemSettings) -> SystemSettingsOut:
         openai_base_url=row.openai_base_url,
         openai_model=row.openai_model,
         openai_api_key_set=bool(row.openai_api_key),
+        ocr_service_url=row.ocr_service_url,
         updated_at=row.updated_at,
     )
 
@@ -74,6 +75,8 @@ def update_settings(
         row.openai_model = data.openai_model or None
     if data.openai_api_key is not None and data.openai_api_key.strip():
         row.openai_api_key = data.openai_api_key.strip()
+    if data.ocr_service_url is not None:
+        row.ocr_service_url = data.ocr_service_url.strip() or None
     row.updated_at = datetime.now(timezone.utc)
     db.commit()
     db.refresh(row)

backend/app/routers/wrong_questions.py

@@ -11,7 +11,7 @@ from sqlalchemy.orm import Session, joinedload
 from app.core.config import settings
 from app.core.database import SessionLocal, get_db
 from app.core.deps import get_current_user
-from app.models.user import Subject, User, WrongQuestion, WrongQuestionCategory, WrongQuestionStatus
+from app.models.user import Subject, SystemSettings, User, WrongQuestion, WrongQuestionCategory, WrongQuestionStatus
 from app.schemas import WrongQuestionCategoryEnum, WrongQuestionOut, WrongQuestionUpdate
 from app.services import annotation as annotation_service
 from app.services import llm as llm_service
@@ -50,6 +50,13 @@ def _expire_stale_processing(wq: WrongQuestion, db: Session) -> None:
     db.commit()
 
 
+def _ocr_service_url(db: Session) -> str | None:
+    row = db.get(SystemSettings, 1)
+    if row and row.ocr_service_url:
+        return row.ocr_service_url.strip() or None
+    return ocr_service.resolve_ocr_service_url()
+
+
 def _parse_mark_regions(raw: str | None) -> list[dict] | None:
     if not raw:
         return None
@@ -140,9 +147,12 @@ def _process_wrong_question(question_id: uuid.UUID):
 
         wq.error_message = None
         image_full = Path(settings.UPLOAD_DIR) / wq.image_path
+        ocr_url = _ocr_service_url(db)
         try:
             with ThreadPoolExecutor(max_workers=1) as pool:
-                future = pool.submit(ocr_service.run_ocr_with_regions, str(image_full))
+                future = pool.submit(
+                    ocr_service.run_ocr_with_regions, str(image_full), ocr_url
+                )
                 ocr_result = future.result(timeout=settings.OCR_TIMEOUT_SECONDS)
             ocr_text = ocr_result["text"]
             ocr_lines = ocr_result["lines"]
@@ -166,6 +176,8 @@ def _process_wrong_question(question_id: uuid.UUID):
             msg = _short_error(exc, "OCR 识别失败：")
             if "libGL" in str(exc):
                 msg += " 请在服务器执行: sudo bash deploy/install-ocr-deps.sh && systemctl restart grade-archive"
+            elif ocr_url:
+                msg += f" 请检查 OCR 服务是否可达: {ocr_url} （可浏览器访问 {ocr_url.rstrip('/')}/health）"
             wq.error_message = msg
             db.commit()
             return

backend/app/schemas/__init__.py

@@ -74,6 +74,7 @@ class SystemSettingsOut(BaseModel):
     openai_base_url: str | None = None
     openai_model: str | None = None
     openai_api_key_set: bool = False
+    ocr_service_url: str | None = None
     updated_at: datetime
 
     model_config = {"from_attributes": True}
@@ -87,6 +88,7 @@ class SystemSettingsUpdate(BaseModel):
     openai_base_url: str | None = None
     openai_model: str | None = None
     openai_api_key: str | None = None
+    ocr_service_url: str | None = None
 
 
 class AdminProfileUpdate(BaseModel):

backend/app/services/migrate.py

@@ -61,6 +61,8 @@ def run_migrations() -> None:
             alters.append("ADD COLUMN openai_model VARCHAR(128)")
         if "openai_api_key" not in ss_columns:
             alters.append("ADD COLUMN openai_api_key VARCHAR(512)")
+        if "ocr_service_url" not in ss_columns:
+            alters.append("ADD COLUMN ocr_service_url VARCHAR(256)")
         if alters:
             with engine.begin() as conn:
                 for clause in alters:

backend/app/services/ocr.py

@@ -5,6 +5,7 @@ import threading
 from io import BytesIO
 from pathlib import Path
 
+import httpx
 from PIL import Image
 
 from app.core.config import settings
@@ -23,22 +24,32 @@ def get_ocr_engine():
     if _ocr_engine is None:
         from paddleocr import PaddleOCR
 
+        use_gpu = settings.OCR_USE_GPU
         _ocr_engine = PaddleOCR(
             use_angle_cls=False,
             lang="ch",
             show_log=False,
-            use_gpu=False,
-            enable_mkldnn=True,
+            use_gpu=use_gpu,
+            enable_mkldnn=not use_gpu,
             det_limit_side_len=min(settings.OCR_MAX_SIDE, 1280),
             rec_batch_num=8,
         )
     return _ocr_engine
 
 
+def resolve_ocr_service_url(service_url: str | None = None) -> str | None:
+    url = (service_url or settings.OCR_SERVICE_URL or "").strip()
+    return url or None
+
+
+def uses_remote_ocr(service_url: str | None = None) -> bool:
+    return resolve_ocr_service_url(service_url) is not None
+
+
 def warmup_ocr_engine() -> None:
     """后台预加载 OCR 模型，避免首张图片等待数分钟。"""
     global _ocr_warmup_started
-    if _ocr_warmup_started or not settings.OCR_WARMUP:
+    if _ocr_warmup_started or not settings.OCR_WARMUP or uses_remote_ocr():
         return
     _ocr_warmup_started = True
 
@@ -110,8 +121,20 @@ def _prepare_ocr_image(image_path: str) -> tuple[str, float, float, int, int, Pa
     return str(tmp), scale_x, scale_y, orig_w, orig_h, tmp
 
 
-def run_ocr_with_regions(image_path: str) -> dict:
-    """Return OCR text plus line-level bounding boxes for annotation."""
+def _run_remote_ocr(service_url: str, image_path: str) -> dict:
+    url = f"{service_url.rstrip('/')}/api/ocr/regions"
+    headers: dict[str, str] = {}
+    if settings.OCR_API_KEY:
+        headers["X-OCR-Key"] = settings.OCR_API_KEY
+    with open(image_path, "rb") as handle:
+        files = {"file": (Path(image_path).name, handle, "image/jpeg")}
+        with httpx.Client(timeout=settings.OCR_TIMEOUT_SECONDS) as client:
+            resp = client.post(url, files=files, headers=headers)
+            resp.raise_for_status()
+            return resp.json()
+
+
+def _run_local_ocr(image_path: str) -> dict:
     engine = get_ocr_engine()
     ocr_path, scale_x, scale_y, orig_w, orig_h, tmp_path = _prepare_ocr_image(image_path)
     try:
@@ -150,6 +173,14 @@ def run_ocr_with_regions(image_path: str) -> dict:
     }
 
 
+def run_ocr_with_regions(image_path: str, service_url: str | None = None) -> dict:
+    """Return OCR text plus line-level bounding boxes for annotation."""
+    remote = resolve_ocr_service_url(service_url)
+    if remote:
+        return _run_remote_ocr(remote, image_path)
+    return _run_local_ocr(image_path)
+
+
 def run_ocr(image_path: str) -> str:
     return run_ocr_with_regions(image_path)["text"]