Detect Text direction

[tuan-nng]

I have an image which is rotated 90 degrees. The program rotates it back 90 degrees but in wrong direction - text is on reverse direction.

Do you have any idea how to fix this?

[apdullahyayik]

Angle is correct but with 50 percent. It should be fixed

[sbrunner]

Can you provide the failing image?

[kbrajwani]

@sbrunner
in my case if image angle is 80 it will rotate more 10 so angle will become 90. same for 180 and 270 degrees.
image

import numpy as np
from skimage import io
from skimage.transform import rotate
from skimage.color import rgb2gray
import cv2
from deskew import determine_skew

filename = 'Acord25.png'
image_orig = cv2.imread(filename)
image_orig = rgb2gray(image_orig)
image_orig1 = rotate(image_orig, 90,resize = True,cval=1)*255  ## i have done custom rotation for check code
image_orig1 = image_orig1.astype(np.uint8)
image_orig1.shape

image = rgb2gray(image_orig1)
angle = determine_skew(image)
print(angle)
if angle != 0:
  image_orig1 = rotate(image_orig1, angle, resize=True,cval=1) * 255

actual angle is 90 but it gives me 0.0 .
if my actual angle is 80 then it gives me 10.0 which will make my image rotation at 90 degree .

[kbrajwani]

hey @sbrunner can you help me in this.

@sbrunner
in my case if image angle is 80 it will rotate more 10 so angle will become 90. same for 180 and 270 degrees.
image

import numpy as np
from skimage import io
from skimage.transform import rotate
from skimage.color import rgb2gray
import cv2
from deskew import determine_skew

filename = 'Acord25.png'
image_orig = cv2.imread(filename)
image_orig = rgb2gray(image_orig)
image_orig1 = rotate(image_orig, 90,resize = True,cval=1)*255  ## i have done custom rotation for check code
image_orig1 = image_orig1.astype(np.uint8)
image_orig1.shape

image = rgb2gray(image_orig1)
angle = determine_skew(image)
print(angle)
if angle != 0:
  image_orig1 = rotate(image_orig1, angle, resize=True,cval=1) * 255

actual angle is 90 but it gives me 0.0 .
if my actual angle is 80 then it gives me 10.0 which will make my image rotation at 90 degree .

[Jovi-droid]

angle += 90 if angle < -88 else 0

[llermaly]

Same problem here. I'm trying with ID's

if the text is facing to the right (rotated 90°) then works good, but if its facing to the left then it rotates upside down.

[sbrunner]

deskew didn't detect the text direction, you can use tesseract --psm 0 to get the right orientation :-)

[shubham303]

angle += 90 if angle < -88 else 0

I used this condition before rotating, now it works fine. all the images are correctly rotated. But I did not understand the logic behind it.

[varun-affinsys]

angle += 90 if angle < -88 else 0

I used this condition before rotating, now it works fine. all the images are correctly rotated. But I did not understand the logic behind it.

Can u send ur final code.

[flash0729]

        start = time.time()
        filePath = path + '/' + str(f)
        image = cv2.imread(filePath)
        grayscale = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
        angle = determine_skew(grayscale)
        angle += 90 if angle < -88 else 0
        print('calculated=' + str(angle) + ', file=' + str(f))
        rotated = rotate(image, angle, (0, 0, 0))
        end = time.time()
        print('time' + str(end - start))
        cv2.imwrite('res/rotated-' + str(f), rotated)