OCR PDF file is an output file in the Portable Document Format (PDF) of Optical character recognition, which is basically electro-mechanical format of images of typewritten, handwritten, or printed text, that are usually gathered by a scanner input device into an editable format.
Considering the historical overview of the OCR PDF file, a mechanical device used to be utilized as a template via means of a photo detector in the initial days. Shepard founded intelligent machines Research Corporation to deliver the worlds first several OCR systems for the development of OCR PDF file online.
The OCR PDF File can be formed with the help of various new versions of adobe acrobat released. There are eight versions of PDF file with corresponding acrobat releases. Starting from 1993 up to 2008 acrobat 1.0 – 9.0 have been released however in early years the file was mainly popular in desktop publishing work-flow.
For creation of OCR PDF File there is no need to pay royalties to Adobe Systems though it holds the patents to release the PDF file format. The OCR PDF F file format combines mainly 3 technologies such as the post script page description programming language, which is used for the generation of the layout and graphics, font embedding or replacement system to allow fonts for the traveling with the files, a structure storage system with data compression used to bundle the contents into a single file. Then you can easily use these free OCR PDF files online.
The OCR PDF File primarily consists of 8 types of objects like Boolean values, the null objects, streams that generally contain massive amounts of data, names, numbers, arrays that are basically an ordered group of objects, strings, and the dictionaries, which are the collections of objects, listed alphabetically depending upon nomenclature.
These objects may be either direct or indirect. In this type of file there may be 2 layouts like linear and non linear. The non-linear OCR PDF file consumes less disk space than its linear counter part.
As a whole, these OCR PDF files are indeed very handy in many respects, especially when you run OCR on PDF file, or use OCR PDF files online. Lastly, you should also remember that you find other software to run OCR on a PDF document, other than Adobe Systems.
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January 4, 2011 at 2:20 am
I nearly tried all free online OCR services. All of them give more or less the same quality. I recently came across Sciweavers’ ree-online-ocr, which provides a good balance between high accuracy and very clean user interface. The service does not imply any restrictions so far, no ads, 33+ languages, multiple image formats.