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2. PDF - Wikipedia

   en.wikipedia.org/wiki/PDF

   A PDF file is organized using ASCII characters, except for certain elements that may have binary content. The file starts with a header containing a magic number (as a readable string) and the version of the format, for example %PDF-1.7. The format is a subset of a COS ("Carousel" Object Structure) format. [23]

3. hOCR - Wikipedia

   en.wikipedia.org/wiki/Hocr

   hOCR. hOCR is an open standard of data representation for formatted text obtained from optical character recognition (OCR). The definition encodes text, style, layout information, recognition confidence metrics and other information using Extensible Markup Language (XML) in the form of Hypertext Markup Language (HTML) or XHTML.

4. Reverse image search - Wikipedia

   en.wikipedia.org/wiki/Reverse_image_search

   An image search engine is a search engine that is designed to find an image. The search can be based on keywords, a picture, or a web link to a picture. The results depend on the search criterion, such as metadata, distribution of color, shape, etc., and the search technique which the browser uses.

5. AOL Search FAQs - AOL Help

   help.aol.com/articles/aol-search-faqs

   Images. Image search results are images sorted by relevance, with images of the highest relevance appearing first. A number of factors are considered when determining whether an image is relevant to your search request. Because these methods are not entirely foolproof, it's possible some inappropriate pictures may be included among the images ...

6. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   Free (Mozilla Public License) an Office suite; allows to export (and import, with accuracy limitations) PDF files. Microsoft Word 2013. Proprietary. Desktop software. The 2013 edition of Office allows PDF files to be converted into a format that can be edited. Nitro PDF Reader. Trialware.

7. Contextual searching - Wikipedia

   en.wikipedia.org/wiki/Contextual_searching

   Contextual searching. Contextual search is a form of optimizing web-based search results based on context provided by the user and the computer being used to enter the query. [1] Contextual search services differ from current search engines based on traditional information retrieval that return lists of documents based on their relevance to the ...