NoisOCR

Tools to simulate post-OCR noisy texts.

Features:

• Sliding window;
• Sliding window with hyphenation;
• Simulate text errors;
• Simulate text annotations.

Install

pip install noisocr

Sliding window:

import noisocr

text = "Lorem Ipsum is simply dummy...type specimen book."
max_window_size = 50

windows = noisocr.sliding_window(text, max_window_size)

# Output:
# [
#   'Lorem Ipsum is simply dummy text of the printing', 
#   ...
#   'type and scrambled it to make a type specimen', 
#   'book.'
# ]

Sliding window with hyphenation:

• See the package https://pypi.org/project/PyHyphen to see all supported languages.

import noisocr

text = "Lorem Ipsum is simply dummy...type specimen book."
max_window_size = 50

windows = noisocr.sliding_window_with_hyphenation(text, max_window_size, 'en_US')

# Output:
# [
#   'Lorem Ipsum is simply dummy text of the printing ',        
#   'typesetting industry. Lorem Ipsum has been the in-', 
#   ...
#   'scrambled it to make a type specimen book.'
# ]

Simulate text errors:

• See the package https://pypi.org/project/typo to see all possible error types.

import noisocr

text = "Hello world."
text_with_errors = noisocr.simulate_errors(text, interactions=1)
# Output: Hello, wotrld!
text_with_errors = noisocr.simulate_errors(text, 2)
# Output: Hsllo,wlorld!
text_with_errors = noisocr.simulate_errors(text, 5)
# Output: fllo,w0rlr!

Simulate text annotations:

• By default, the annotations found in the BRESSAY dataset were used. But you can define which types of annotations you want to simulate. For annotations with internal text, use the pattern ##--text--##.

import noisocr

text = "Hello world."
text_with_annotation = noisocr.simulate_annotation(text, probability=0.5)
# Output: Hello, $$--xxx--$$
text_with_annotation = noisocr.simulate_annotation(text, probability=0.5)
# Output: Hello, ##--world!--##
text_with_annotation = noisocr.simulate_annotation(text, 0.01)
# Output: Hello world.