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fix: swap 90°/270° rotation direction in orientation detection
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Browse Source 
Tesseract OSD 'rotate' returns the clockwise correction needed,
but the code was applying counterclockwise for 90° and clockwise
for 270° — exactly reversed. This caused pages scanned sideways
to be flipped upside down instead of corrected.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Benjamin Admin
2026-03-17 16:39:15 +01:00
parent 902de027f4
commit 438a4495c7
1 changed files with 3 additions and 3 deletions
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6
klausur-service/backend/cv_preprocessing.py
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@@ -113,13 +113,13 @@ def detect_and_fix_orientation(img_bgr: np.ndarray) -> Tuple[np.ndarray, int]:
if rotate == 0 or confidence < 1.0: if rotate == 0 or confidence < 1.0:
return img_bgr, 0 return img_bgr, 0
# Apply rotation # Apply rotation — OSD rotate is the clockwise correction needed
if rotate == 180: if rotate == 180:
corrected = cv2.rotate(img_bgr, cv2.ROTATE_180) corrected = cv2.rotate(img_bgr, cv2.ROTATE_180)
elif rotate == 90: elif rotate == 90:
corrected = cv2.rotate(img_bgr, cv2.ROTATE_90_COUNTERCLOCKWISE)
elif rotate == 270:
corrected = cv2.rotate(img_bgr, cv2.ROTATE_90_CLOCKWISE) corrected = cv2.rotate(img_bgr, cv2.ROTATE_90_CLOCKWISE)
elif rotate == 270:
corrected = cv2.rotate(img_bgr, cv2.ROTATE_90_COUNTERCLOCKWISE)
else: else:
return img_bgr, 0 return img_bgr, 0