Capitalization and punctuation restoration: a survey

Ensuring proper punctuation and letter casing is a key pre-processing step towards applying complex natural language processing algorithms. This especially significant for textual sources where are missing, such as the raw output of automatic speech recognition systems. Additionally, short text messages micro-blogging platforms offer unreliable often wrong casing. survey offers an overview both historical state-of-the-art techniques restoring correcting word Furthermore, current challenges research directions highlighted.