PDFlib TET – Unique Advantages


TET detects hyphenated words which span multiple lines, removes the hyphen, and combines the individual parts to form a complete word. This is important to make sure that searches for the full word will be successful although only hyphenated parts are present in the document. Dashes (different from hyphens) will be treated separately since they must not be removed.


TET correctly removes the hyphen, but keeps the dash

Shadow and artifical bold Text Detection

Digital documents often contain shadowed text where the shadow effect is achieved by placing the text multiply on the page, using a small offset between the instances of text. Similarly, bold text is often simulated by overprinting the same text multiply. As a result, the document contains the characters in the shadowed or bold word more than once. TET’s patented shadow detection algorithm identifies and removes redundant instances of text to avoid excess text extraction. While other software will extract the shadowed or bold text multiply, TET correctly removes the redundant copies. While extra instances of a word will still result in a search engine hit, no more hits would be found if the text is duplicated character by character as in the example.

Other products extract »Inttrroduccttiion«

TET extracts »Introduction«

Accented Characters

In many languages accents and other diacritical marks are placed close to other characters to form combined characters. Some typesetting programs, most notably TeX, emit two characters (base character and accent) separately to create a combined character. For example, to create the character ä first the letter a is placed on the page, and then the dieresis character ¨ is placed on top of it. TET detects this situation and recombines both characters to form the appropriate combined character.

Other products extract »Midi-Pyr´en´ees«

TET extracts »Midi-Pyrénées«


Ligatures combine two or more characters in a single glyph. When extracting text from digital documents, ligatures must be analyzed and separated to the constituent characters to allow proper text processing. TET detects ligatures based on many properties and delivers two or more characters as appropriate

Other products extract » e rst photographs«

TET extracts »The first photographs«

Image Merging

The images in many PDF documents are broken into smaller pieces by the software producing the PDF. What appears as a single image on the page may actually consist of hundreds or thousands of small fragments. Among others, Microsoft Office applications and TeX are known to produce such documents. TET detects fragmented images and merges the pieces to form a usable larger image. Only with image merging such images can be repurposed in any way.

Other products extract 133 tiny little strips

TET extracts a single large image