Technical Specification

What is OCR? Optical Character Recognition Explained

Optical Character Recognition (OCR) technology analyzes patterns of dark and light pixels in document images to recognize letters, numbers, and punctuation marks.

Key Takeaways & Technical Standards

  • OCR turns static bitmap images into editable ASCII/Unicode text streams.
  • Modern OCR uses deep learning character shape matrices and dictionary language modeling.
  • Enables Ctrl+F text search across millions of scanned historical pages.

The 3 Stages of Modern OCR Processing

1. Pre-Processing: The document image is binarized, deskewed, and cleaned of background noise using Otsu thresholding.

2. Feature Extraction: Contours and character curves are compared against glyph vector libraries.

3. Post-Processing: Language models correct common optical typos.

Related PDF Tools

PDFBolt Full Platform Directory

Core PDF Tools (25+)

How-To Guides (12+)

Encyclopedia & Hubs