How to Compare OCR Tools: Tesseract OCR vs Amazon Textract vs Azure OCR vs Google OCR

Optical Character Recognition (OCR) tools are software able to detect and extract texts from images. They are used in the early steps of the analysis of scanned documents to recognize and automatically process the information that the documents contain. Depending on the complexity of the documents to be analyzed, OCR tools can be used to both detect and extract the texts from them or, in some pipelines, they are used only to extract the text from previously identified regions of interest, e.g. Paragraphs, Tables, Titles,… The latter case is of my particular interest. For these reasons the article will be focused on the extraction task.