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Tesseract.js vs Tesseract OCR: What are the differences?
What is Tesseract.js? Pure JavaScript OCR for 60 Languages. This library supports over 60 languages, automatic text orientation and script detection, a simple interface for reading paragraph, word, and character bounding boxes. Tesseract.js can run either in a browser and on a server with NodeJS.
What is Tesseract OCR? Tesseract Open Source OCR Engine. Tesseract was originally developed at Hewlett-Packard Laboratories Bristol and at Hewlett-Packard Co, Greeley Colorado between 1985 and 1994, with some more changes made in 1996 to port to Windows, and some C++izing in 1998. In 2005 Tesseract was open sourced by HP. Since 2006 it is developed by Google.
Tesseract.js and Tesseract OCR can be primarily classified as "Image Analysis API" tools.
Tesseract.js and Tesseract OCR are both open source tools. It seems that Tesseract OCR with 27.8K GitHub stars and 5.31K forks on GitHub has more adoption than Tesseract.js with 16K GitHub stars and 1.09K GitHub forks.
AWS Rekognition has an OCR feature but can recognize only up to 50 words per image, which is a deal-breaker for us. (see my tweet).
Also, we discovered fantastic speed and quality improvements in the 4.x versions of Tesseract. Meanwhile, the quality of AWS Rekognition's OCR remains to be mediocre in comparison.
We run Tesseract serverlessly in AWS Lambda via aws-lambda-tesseract library that we made open-source.
Pros of Tesseract.js
- Graph Recognization2
Pros of Tesseract OCR
- Building training set is easy4
- Very lightweight library1
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Cons of Tesseract.js
Cons of Tesseract OCR
- Works best with white background and black text1