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What are the common expectations from an OCR Software?
Document images come in different shapes and qualities. Sometimes they are scanned, other times they are captured by handheld devices. Apart from the printed text these might also contain handwriting and structural elements such as boxes and tables. Thus the ideal OCR Software should :
- recognize well-scanned text reliably,
- be robust towards bad image quality and handwriting,
- output information on the formatting and structure of the document.
Top 5 OCR Software in 2023
There are various OCR software available in the market that help converting unstructured and semi-structured documents into digital format, but which one to choose that will best-suit for your business requirements.
In this article, we will compare and shed some light on the 5 best OCR software available in the market in 2023.
1. Tesseract OCR
AWS Tesseract is one of the best OCR software in the market. The best thing about Tesseract is in that it is free and easy to use. It is a command-line OCR engine tool developed by Hewlett-Packard, but its utilisation is simplified significantly with a Python wrapper called pytesseract. Also, there is a GUI frontend gImageReader, so you can choose the one that best fits your purposes.
However, we noticed that Tesseract’s image processing is very rudimentary. In order to get the most out of it, you need to use an image pre-processor or use an image that’s already been processed (This is also a major reason why KlearStack OCR comes handy since it has the built-in capability of pre-processing of the images before extracting the text through Tesseract).
2. ABBY FineReader
ABBYY is comparatively versatile at extracting text from scanned files and images of well-scanned documents. This application can extract the text from some of the most popular image formats, like PNG, JPG, BMP, and TIFF and can also extra text from file formats like PDFs and files. All you have to do is upload a high-resolution image or file for the program to analyze, and then select which portions of extractable text you want to be saved.
However, the quality of OCR output degrades significantly when the scans are of poor quality and contain handwritten text. Besides, the text extracted from ABBBY needs further post-processing for domain-specific keywords, when complex financial documents are handled.
3. Google Cloud Vision API
Next in line is the Google Cloud Vision which is available to use via the API. Just like ABBBY FineReader, it is also a paid service (pricing).
Google Vision API does well on the scanned email and recognizes the text in the smartphone-captured document similarly well as ABBYY. However, it is much better than Tesseract or ABBYY in recognizing handwriting. On the other hand, Google Cloud Vision doesn’t handle tables very well: It extracts the text, but that’s about it.
Another major limitation that users face is that the Google vision OCR does not support document size of more than 10 MB, which can be a common use-case.
In fact, the original Cloud Vision output is a JSON file containing information about character positions. Just as for Tesseract, based on this information one could try to detect structural elements But again, this functionality is not built-in.
4. OmniPage Nuance
OmniPage SDK is another easy to use OCR SDK and can handle more complex document layouts, such as tables, columns, lists, and even graphics. Additionally, there are image editing tools that allow you to edit an image for clarity, to ensure optimal extraction.
But the major drawback is most of these features are Windows OS limited and need tedious configuration to accommodate into Linux based environments. Also, the output accuracy falls when the documents contain colored or highlighted text/ background.
5. KlearStack AI-driven OCR
KlearStack’s OCR which was built over Tesseract uses a HYBRID TECHNIQUE, which is the combination of the two techniques. First, using the deep learning algorithms, the region-based approach is used to detect a ‘text-containing’ zone. Then, with the usage of the Tesseract OCR, all the features are extracted from the text region.
To apprehend better, let us dig a bit deeper. Relying upon recent work in object detection, our Deep learning algorithm is able to simultaneously localize and recognize text blocks in arbitrarily complex documents. In order to train the model described here, we needed a large number of labeled images. Instead of generating and tagging these manually, we instead chose to develop our own synthetic training documents.
With enough variability in document layouts, fonts, sizes, highlighted colors, brand logos, and so on, our synthetic data was used to train models that are now able to perform well on real-world images of documents. We generated around ten thousand such images which led to a strong performance in the real world cases during the predictions. This was indeed a promising approach for increasing the efficiency of document processing pipelines.
Additionally, KlearStack’s OCR Software has also been customized to identify the currency symbols in the financial documents which even the best OCR software fail to identify. KlearStack OCR also leverages Natural Language Processing models for post-processing the raw OCR data. That ensures the domain-specific text is auto-corrected when the scan quality is below par.
Although KlearStack OCR Software performs versatile OCR over images and PDF documents, it was primarily developed and integrated to be a part of an AI-based software called KlearStack. Organizations across all industries have adopted KlearStack, owing to its template-less data extraction from financial documents.
It has been adopted to achieve end-to-end automation of a wide range of Accounting operations such as Invoice processing automation, Straight-through Receipt Processing, Fraud detection in Employee expense claims, Bank statement & Foreign Currency Reconciliations and much more!