Pytesseract OCR with OpenCV & Python: Programming Tutorial

Discover the amazing world of optical character recognition (OCR) with Tesseract, OpenCV and Python! This in-depth guide takes you on a journey to understand the technology behind Tesseract, the most popular OCR engine, and how to implement it with Pytesseract and OpenCV. Learn about the different sub-processes of OCR:

  • including preprocessing
  • Text localization
  • Character segmentation
  • Character Recognition
  • Post-processing

How to convert images to text with Pytesseract

To use pytesseract to convert an image to text, you must install the pytesseract library and have Tesseract OCR installed on your computer. Here are the steps:

  1. Install the pytesseract library with the command: "pip install pytesseract".

  2. Import the pytesseract library into your Python script: "import pytesseract"

  3. Load the image with OpenCV: "img = cv2.imread("image.png")".

  4. Use the pytesseract.image_to_string() function to convert the image to text: "text = pytesseract.image_to_string(img)"

  5. The extracted text is now stored in the variable "text" and can be processed further.

Here is an example of using pytesseract to convert an image to text:

import cv2
import pytesseract
# Load image
img = cv2.imread("example_image.jpg")
# Convert image to grayscale
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
# Apply threshold to convert to binary image
threshold_img = cv2.threshold(gray, 0, 255, cv2.THRESH_BINARY + cv2.THRESH_OTSU)[1]
# Pass the image through pytesseract
text = pytesseract.image_to_string(threshold_img)
# Print the extracted text
print(text)

In this example, the image is first created with the OpenCV-function imread is loaded. Then the image is converted to grayscale with the cvtColor function. This step is important because OCR works better on grayscale images. Next, a threshold is applied to the grayscale image to convert it to a binary image. Finally, the binary image is converted by the image_to_string function of pytesseract which returns the extracted text as a string.

Python OCR Framework

The Konfuzio software offers as an alternative to the free Pytesseract solution with Tesseract a robust framework for developers to implement custom and robust document processing solutions in Python.

-> Read the documentation now

Pytesseract vs. enterprise solution - comparison of accuracy, scalability and costs

There are several reasons why someone would choose a Document AI provider decides instead of programming an OCR solution itself:

  • Time: Developing an OCR solution from scratch can take a lot of time and resources. With a Document AI provider, the process can be accelerated and time to market can be shortened.
  • Costs: Developing a custom OCR solution can be expensive, especially if you need to hire experts or buy specialized tools and software. A Document AI provider offers a cost-effective alternative with access to pre-built models and infrastructure. Konfuzio Pricing you can find here.
  • ExpertiseOCR is a complex field, and developing an accurate solution requires a deep understanding of computer vision, machine learning, and natural language processing. With a Document AI provider, you can draw on the expertise of a dedicated team of professionals so you can focus on your core business.
  • Scalability: A custom OCR solution may not be able to meet the demands of a large-scale deployment. With a Document AI provider, you have access to infrastructure and resources that can handle large volumes of data and ensure high performance.
  • Maintenance: Maintaining a custom OCR solution requires continuous effort, including software upgrades, bug fixes, and security patches. With a Document AI provider, the maintenance burden is shifted to the vendor, freeing up your internal resources to focus on other priorities.

Overall, the use of a Document AI provider a fast, cost-effective and scalable solution that allows you to focus on your business while leaving the technical details to the experts.

Stay ahead of the curve by keeping up with the latest research in the field of Deep Learning and OCR employ. Automate your workflow with Konfuzio and reduce your company's data entry costs. So, what are you waiting for? Read on and unlock the power of today with Online OCR Services!

Further contributions as a recommendation

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