Character Enhancement for Historical Newspapers Printed Using Hot Metal Typesetting

—We propose a new method for an effective removal of the printing artifacts occurring in historical newspapers which are caused by problems in the hot metal typesetting, a widely used printing technique in the late 19th and early 20th century. Such artifacts typically appear as thin lines between single characters or glyphs and are in most cases connected to one of the neighboring characters. The quality of the optical character recognition (OCR) is heavily influenced by this type of printing artifacts. The proposed method is based on the detection of (near) vertical segments by means of directional single-connected chains (DSCC). In order to allow the robust processing of complex decorative fonts such as Fraktur, a set of rules is introduced. This allows us to successfully process prints exhibiting artifacts with a stroke width even higher than that of most thin characters stems. We evaluate our approach on a dataset consisting of old newspaper excerpts printed using Fraktur fonts....

• Type: Journal
• Year: 2011
• Where: ICDAR
• Authors: Iuliu Vasile Konya, Stefan Eickeler, Christoph Seibert
• Keywords: Document Analysis, ICDAR 2011, OCR Engines, Optical Character Recognition, Optical Character Recognition Ocr