后端:稳定租户链路与 VLM 图片质量检测 #9

Merged
TanWenyan merged 4 commits from wren-dev into main 2026-05-22 16:05:07 +08:00
3 changed files with 159 additions and 7 deletions
Showing only changes of commit 9434f2b22b - Show all commits
@@ -239,7 +239,7 @@ class ResilientQwenVLMClient(QwenVLMClient):
body = response.json()
text = (body.get("choices") or [{}])[0].get("message", {}).get("content", "")
parsed = _parse_json_loose(text)
return parsed if isinstance(parsed, dict) else {}
return parsed if isinstance(parsed, dict) else {"result": text, "reason": text}
class ResilientChandraOCRClient(ChandraOCRClient):
@@ -6,6 +6,7 @@ from typing import Any
from pathlib import Path
import tempfile
import logging
import json
import fitz
from leaudit.converters import doc2pdf
@@ -30,9 +31,11 @@ _PAGE_QUALITY_VLM_PROMPT = """
你是文档扫描图片质量检测员。请判断这 1 页文档图片是否适合继续做 OCR 与合同/公文评查。
判定标准:
1. pass:文字主体清晰、方向正常、没有明显截断,能稳定阅读
2. review:存在轻微模糊、倾斜、阴影、低对比度、局部遮挡、轻微截断,建议人工确认但仍可能可读
3. reject:严重模糊、重影、过曝/过暗、页面大面积缺失、关键文字不可辨认、方向严重错误、空白页或非文档页,建议重拍
1. 必须同时检查整页扫描质量,以及页面内所有内嵌照片、证据照片、现场照片、截图、印章和签名图片的清晰度
2. pass:文字主体清晰、方向正常、没有明显截断;页面内嵌照片/证据照片也能辨认关键视觉信息
3. review:存在轻微模糊、倾斜、阴影、低对比度、局部遮挡、轻微截断;或内嵌照片/证据照片主体明显发虚、牌匾/场所/人物/关键物证不易辨认,建议人工确认但仍可能可用
4. reject:严重模糊、重影、过曝/过暗、页面大面积缺失、关键文字不可辨认、方向严重错误、空白页或非文档页;或内嵌证据照片主体无法辨认、关键证据信息不可用,建议重拍。
5. 即使页面周边文字清楚,只要内嵌证据照片明显模糊,也不能判 pass,至少判 review,严重时判 reject。
只输出 JSON,不要输出 Markdown,不要解释额外文本:
{"status":"pass|review|reject","score":0.0到1.0,"reason":"20字以内中文原因"}
@@ -495,12 +498,28 @@ class PageQualityServiceImpl(IPageQualityService):
logger.warning("VLM page quality detection failed: %s", exc)
return "review", 0.5, "VLM图片质量检测失败,需人工确认"
status = str((result or {}).get("status") or "").strip().lower()
result_dict = self._coerce_vlm_result(result)
status = self._normalize_quality_status(
self._first_non_empty(
result_dict,
("status", "quality_status", "qualityStatus", "result", "label", "decision", "conclusion"),
)
)
reason = self._normalize_quality_reason(
self._first_non_empty(
result_dict,
("reason", "quality_reason", "qualityReason", "message", "msg", "detail", "explanation", "description"),
)
)
if status is None and reason:
status = self._normalize_quality_status(reason)
if status not in {"pass", "review", "reject"}:
return "review", 0.5, "VLM返回结果不可用,需人工确认"
score = self._normalize_quality_score((result or {}).get("score"), status)
reason = str((result or {}).get("reason") or "").strip() or None
score = self._normalize_quality_score(
self._first_non_empty(result_dict, ("score", "quality_score", "qualityScore", "confidence")),
status,
)
if status != "pass" and not reason:
reason = "页面图片质量需人工确认"
return status, score, reason
@@ -526,6 +545,56 @@ class PageQualityServiceImpl(IPageQualityService):
return defaults[status]
return max(0.0, min(1.0, score))
def _coerce_vlm_result(self, result: Any) -> dict[str, Any]:
if isinstance(result, dict):
return result
if isinstance(result, str):
text_result = result.strip()
if not text_result:
return {}
try:
parsed = json.loads(text_result)
except json.JSONDecodeError:
return {"result": text_result, "reason": text_result}
return parsed if isinstance(parsed, dict) else {"result": text_result}
return {}
def _first_non_empty(self, payload: dict[str, Any], keys: tuple[str, ...]) -> Any:
for key in keys:
value = payload.get(key)
if value is not None and str(value).strip():
return value
return None
def _normalize_quality_status(self, raw_status: Any) -> str | None:
text_status = str(raw_status or "").strip().lower()
if not text_status:
return None
compact_status = text_status.replace(" ", "").replace("_", "").replace("-", "")
if compact_status in {"pass", "passed", "ok", "good", "clear", "readable"}:
return "pass"
if compact_status in {"review", "warn", "warning", "manual", "uncertain", "suspect", "suspicious"}:
return "review"
if compact_status in {"reject", "rejected", "fail", "failed", "bad", "unreadable", "retake"}:
return "reject"
reject_keywords = ("不通过", "拒绝", "重拍", "不可读", "无法辨认", "无法识别", "严重", "大面积缺失", "空白页")
review_keywords = ("复核", "人工", "疑似", "轻微", "建议确认", "建议人工", "模糊", "不清晰", "低对比", "发虚")
pass_keywords = ("通过", "合格", "清晰", "可读")
if any(keyword in text_status for keyword in reject_keywords):
return "reject"
if any(keyword in text_status for keyword in review_keywords):
return "review"
if any(keyword in text_status for keyword in pass_keywords):
return "pass"
return None
def _normalize_quality_reason(self, raw_reason: Any) -> str | None:
reason = str(raw_reason or "").strip()
if not reason:
return None
return reason[:80]
def _document_service(self):
if self.DocumentService is None:
from fastapi_modules.fastapi_leaudit.services.impl.documentServiceImpl import DocumentServiceImpl
+83
View File
@@ -1,5 +1,7 @@
import pytest
import httpx
from fastapi_modules.fastapi_leaudit.leaudit_bridge.resilient_clients import ResilientQwenVLMClient
from fastapi_modules.fastapi_leaudit.services.impl.pageQualityServiceImpl import PageQualityServiceImpl
@@ -32,6 +34,58 @@ async def test_vlm_page_quality_reject_result_is_used():
assert score == 0.18
assert "严重模糊" in reason
assert "只输出 JSON" in service.VlmClient.prompts[0][0]
assert "内嵌照片" in service.VlmClient.prompts[0][0]
assert "即使页面周边文字清楚" in service.VlmClient.prompts[0][0]
@pytest.mark.asyncio
async def test_vlm_page_quality_embedded_evidence_blur_cannot_pass():
service = PageQualityServiceImpl()
service.VlmClient = _FakeVlmClient(
{
"quality_status": "疑似模糊",
"quality_score": "0.42",
"message": "内嵌证据照片主体发虚,门头文字不易辨认",
}
)
status, score, reason = await service._classify_page_image_by_vlm(b"image-bytes")
assert status == "review"
assert score == 0.42
assert "内嵌证据照片" in reason
@pytest.mark.asyncio
async def test_vlm_page_quality_chinese_reject_status_is_supported():
service = PageQualityServiceImpl()
service.VlmClient = _FakeVlmClient(
{
"result": "不通过",
"confidence": 0.1,
"detail": "证据照片严重模糊,关键场所无法辨认",
}
)
status, score, reason = await service._classify_page_image_by_vlm(b"image-bytes")
assert status == "reject"
assert score == 0.1
assert "严重模糊" in reason
@pytest.mark.asyncio
async def test_vlm_page_quality_json_string_result_is_supported():
service = PageQualityServiceImpl()
service.VlmClient = _FakeVlmClient(
'{"status":"review","score":0.33,"reason":"页面内照片模糊"}'
)
status, score, reason = await service._classify_page_image_by_vlm(b"image-bytes")
assert status == "review"
assert score == 0.33
assert reason == "页面内照片模糊"
@pytest.mark.asyncio
@@ -56,3 +110,32 @@ async def test_vlm_page_quality_error_falls_back_to_review_not_pass():
assert status == "review"
assert score == 0.5
assert "VLM图片质量检测失败" in reason
@pytest.mark.asyncio
async def test_resilient_vlm_extract_multifield_keeps_raw_text_when_json_parse_fails(monkeypatch):
client = ResilientQwenVLMClient(base_url="http://example.test", api_key="x", model="vlm-test")
async def fake_post_with_retry(payload):
return httpx.Response(
200,
json={
"choices": [
{
"message": {
"content": "疑似模糊:内嵌证据照片主体发虚,建议人工复核",
}
}
]
},
)
monkeypatch.setattr(client, "_post_with_retry", fake_post_with_retry)
result = await client.extract_multifield(
prompt="图片质量检测",
images_data_urls=["data:image/png;base64,xxx"],
)
assert result["result"].startswith("疑似模糊")
assert "内嵌证据照片" in result["reason"]