Here are the steps to extract text from the image in Google Colab Notebook for OCR using Pytesseract:

Step1. Install Pytesseract and tesseract-OCR in Google Colab.

!sudo apt install tesseract-ocr
!pip install pytesseract

Step2. import libraries

import pytesseract
import shutil
import os
import random
try:
 from PIL import Image
except ImportError:
 import Image

Step3. Upload Image to the Colab

We can manually upload the image by clicking on file- upload but we can also use the following code for uploading the image to Colab.

from google.colab import files
uploaded = files.upload()

Step4. Text Extraction

The image_to_string function will take an image as an argument and returns an extracted text from the image. We can either directly print it or store this string in one variable.

image_path_in_colab='image.jpg'
extractedInformation = pytesseract.image_to_string(
  Image.open(image_path_in_colab)
)
print(extractedInformation)

Step5. Detect Langauge other than English:

Specifying language in the above function by lang argument we can change the language text to be detected.

# French text image to string
extractedInformation = pytesseract.image_to_string(
  Image.open('test-european.jpg'), lang='fra'
)
print(extractedInformation

Step6. Get Bounding Boxes for Text

To get bounding box coordinates for the text we use the image_to_boxes function will the same image path argument as the earlier function.

# Get bounding box estimates
print(pytesseract.image_to_boxes(Image.open(image_path_in_colab)))

Feel free to check this Colab Notebook Implementation of the above method.

Pros:

• Easy to use
• Fast Detection
• Most Popular
• Most efficient
• Support 100+ Language
• Oldest OCR Library
• Command-line support

Cons:

• Only works on CPU
• Doesn’t perform well on Blur, Noisy and colorful image
• Performance decrease for lower font size in low-resolution images
• Doesn’t work well on complex Forms

If you want to have text detection and recognition using a single function, check out this AI-based Opensource Easy OCR. It supports 70+ languages and faster GPU Inference.

Note: For Blur, Noisy and colorful image we need to follow some image-processing steps like making image black and white, remove salt and pepper noise using lowpass filters such as averaging filters or Gaussian Filter, We can also make blur image sharpen by using Highpass filter such as Sobel filters. This Image Processing operation can also be implemented by the OpenCV library in python.

IronOCR for .NET

For those working in .NET rather than Python, IronOCR offers a similar experience with built-in image preprocessing.

It handles blur, noise, and color correction automatically, so you don’t need to manually apply filters before OCR. It supports 127+ languages and works directly with NuGet installation. If your project stack is C# or VB.NET, it’s worth exploring as an alternative approach.

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