Mechanic's work place

app/services/ocr_provider.py

@@ -50,17 +50,35 @@ class TesseractOCRProvider:
     def _recognize_sync(self, content: bytes) -> str:
         try:
             import pytesseract
-            from PIL import Image
+            from PIL import Image, ImageEnhance, ImageOps
         except ImportError:
             return ""
         try:
             image = Image.open(BytesIO(content))
         except Exception:
             return ""
+        candidates = [image]
         try:
-            return pytesseract.image_to_string(image, lang=settings.ocr_languages)
+            grayscale = ImageOps.grayscale(image)
+            resized = grayscale.resize((grayscale.width * 2, grayscale.height * 2))
+            contrast = ImageEnhance.Contrast(resized).enhance(1.8)
+            threshold = contrast.point(lambda pixel: 255 if pixel > 165 else 0)
+            candidates.extend([grayscale, contrast, threshold])
         except Exception:
-            return pytesseract.image_to_string(image)
+            candidates = [image]
+        recognized: list[str] = []
+        for candidate in candidates:
+            for config in ("--psm 6", "--psm 11"):
+                try:
+                    text = pytesseract.image_to_string(candidate, lang=settings.ocr_languages, config=config)
+                except Exception:
+                    try:
+                        text = pytesseract.image_to_string(candidate, config=config)
+                    except Exception:
+                        text = ""
+                if text.strip():
+                    recognized.append(text)
+        return "\n".join(recognized)
 
 
 class CompositeOCRProvider: