Detect and fix text rotation(90 degree)

Question

I just found the solution to Detect and fix text skew and related article OpenCV - Rotation (Deskewing). But the solution is not work for some text rotated 90 degree.

I want to fix text rotated 90 degree like images below, Detect and fix text skew solution works for second image but first image is not work.

What is the rotation angle that you get when you run the code?? — Mayank, Jun 27 '17 at 05:10
@Mayank -89, I updated my question, the solution is not work for first image. — tomfriwel, Jun 27 '17 at 05:31
Possible duplicate of [Detect text orientation](https://stackoverflow.com/questions/23783061/detect-text-orientation) — snoob dogg, May 01 '18 at 22:01

score 1 · Answer 1 · answered May 03 '18 at 08:33

You can use the Python OCR (pytesseract) to read the text from image, once you extracted the string, then search for some specific keywords/Stopwords in the text. If they not exist rotate for 90 degree and run OCR again. If they exist stop rotation.

This can rotate 90,270,180 degree shifted images.

Note: This is only applicable for text images.

score 0 · Answer 2 · answered Jun 24 '21 at 17:02

0

use the following code to determine the angle

import pytesseract
cv2_imshow(img)
osd = pytesseract.image_to_osd(img)
angle = re.search('(?<=Rotate: )\d+', osd).group(0)
print("angle: ", angle)

answered Jun 24 '21 at 17:02

DimNsk

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Detect and fix text rotation(90 degree)

2 Answers2