1. Postl, W.: Detection of linear oblique structures and skew scan in digitized documents. In: Conference on Pattern Recognition, pp. 687–689 (1986)
2. Alireza, A., et al.: A painting based technique for skew estimation of scanned documents. In: Conference on Document Analysis and Recognition, pp. 299–303 (2011)
3. Aradhya, V.N.M., Kumar, G.H.: An accurate and efficient skew estimation technique for South Indian documents: a new boundary growing and nearest neighbor clustering based approach. Int. J. Robot. Autom. 22(4), 272–280 (2007)
4. Fabrizio, J.: A Precise Skew Estimation Algorithm for Document Images Using KNN Clustering and Fourier Transform. ICIP, Paris (2014)
5. Stahlberg, F., Vogel, S.: Document Skew Detection Based on Hough Space Derivations. ICDAR, Nancy (2015)