Log In

Npm Ocr Libraries

Most Popular Npm Ocr Libraries

NameSizeLicenseAgeLast Published
node-tesseract6.84 kBMIT11 Years6 Jun 2015
ocrad.js589.64 kBGPL-3.09 Years6 May 2014
nodecr16.23 kBMIT11 Years5 Feb 2013
dv4.17 MBMIT11 Years4 Dec 2019
ocr6.96 MBSEE LICENSE IN licensing/AccusoftLicenseAgreement.txt9 Years6 Dec 2019
tesseract.js-core5.91 MBApache License 2.08 Years1 May 2023
tesseract_native31.46 kBMIT10 Years28 Jan 2016
ndv3.87 MBMIT7 Years20 Jan 2017
pdf-textstring4.46 kBISC8 Years24 Mar 2015
fv31.81 kBMIT9 Years4 Dec 2019
node-tesseract-ocr3.62 kBMIT5 Years11 May 2021
tesseractocr5.35 kBMIT6 Years3 Apr 2022
cordova-plugin-scanbot-sdk421.54 kBCommercial6 Years26 Apr 2023
tesseract9.11 kBMIT11 Years12 Mar 2015
ocrservice61.3 kBGPL v38 Years29 Feb 2016

When are OCR Libraries Useful

OCR (Optical Character Recognition) libraries are useful in a multitude of scenarios where it's necessary to convert various types of images of typed, handwritten, or printed text into machine-readable text. Here are a few scenarios where they really shine:

  • Document Digitization: OCR libraries are primarily used in digitizing printed texts so they can be edited, searched, and stored compactly.
  • Data Extraction: When you have documents such as invoices or bank statements, OCR can be used to extract important information.
  • Automated Form Processing: OCR libraries allow for the automation of processing insurance claims, mail, and other form-based data intake.
  • License Plate Recognition: They can be used in systems where license plate numbers need to be recognized such as in traffic violation systems.

In the context of JavaScript and npm, OCR libraries can be incorporated into Node.js applications that need these capabilities.

Functionality of OCR libraries

Many OCR libraries, regardless of programming language, offer a similar suite of functionalities. This often includes, but is not limited to:

  • Text Recognition: The ability to identify and extract text from images or PDF documents.
  • Handwriting Recognition: The capability to interpret and parse handwritten texts from scanned documents or photos.
  • Language Support: Most OCR libraries provide support for a variety of languages including Latin-based languages and often non-Latin ones as well.
  • Image Pre-processing: Many libraries offer abilities to clean or enhance images for better text recognition, like noise reduction, skew correction, or binarization.
  • Layout Analysis: This is the capability to manage and recognize text layout in documents. This may include recognizing blocks of text, columns, or identifying tables.

With npm, you can leverage many JavaScript OCR libraries that provide these functionalities.

Gotchas/Pitfalls to Look Out For

Despite the robustness and utility of OCR libraries, they have their pitfalls as well. Here are a few to keep an eye on:

  • Image Quality: Poor image quality can significantly impede the library's ability to accurately recognize text. Noise, skew, low resolution, or poor lighting can all negatively affect the performance.
  • Font Dependability: OCR libraries usually have a harder time recognizing texts written in uncommon fonts or handwriting.
  • Accuracy: No OCR library guarantees 100% accuracy. There will always be some degree of error and it might be substantial if above conditions are not met.
  • Processing Time: OCR operations, especially on large documents or images, can be quite slow. You should be aware of this if considering using OCR for real-time applications.
  • Library Maintenance: When choosing an OCR library from npm, be wary of the library's maintenance and support. Libraries that are not actively maintained might pose a dependency risk in the future.

In conclusion, when using npm to bring in an OCR library to your JavaScript project, be aware of when such libraries are beneficial, what functionalities they usually provide, and what complications that can potentially arise.