International Journal of Emerging Trends in Engineering and Development Issue 4, Vol.2 (March 2014) Available online on http://www.rspublication.com/ijeted/ijeted_index.htm ISSN 2249-6149

Skew refers to the text which is neither parallel nor at right angles to a specified or implied line.Even a smallest skew occurring in a document image results in the failure of segmentation of characters from words or text lines.It is therefore essential to detect and correct the skew at the preprocessing stage so that the perturbation of skew can be avoided for further processing. In this paper,a brief overview of document skew, types of skew and skew detection is presented. It also highlights the key problems associated with skew detection. Several approaches concerned with skew detection that have already been developed are discussed in this paper.