Efficient Character Skew Rectification in Scene Text Images

We present an efficient method for character skew rectification in scene text images. The method is based on a novel skew estimators, which exploit intuitive glyph properties and which can be efficiently computed in a linear time. The estimators are evaluated on a synthetically generated data (including Latin, Cyrillic, Greek, Runic scripts) and real scene text images, where the skew rectification by the proposed method improves the accuracy of a state-of-the-art scene text recognition pipeline.

[1]  Andreas Dengel,et al.  ICDAR 2011 Robust Reading Competition Challenge 2: Reading Text in Scene Images , 2011, 2011 International Conference on Document Analysis and Recognition.

[2]  A. Papandreou,et al.  A Novel Skew Detection Technique Based on Vertical Projections , 2011, 2011 International Conference on Document Analysis and Recognition.

[3]  Its'hak Dinstein,et al.  Fast and Accurate Skew Estimation Based on Distance Transform , 2008, 2008 The Eighth IAPR International Workshop on Document Analysis Systems.

[4]  Urs Ramer,et al.  An iterative procedure for the polygonal approximation of plane curves , 1972, Comput. Graph. Image Process..

[5]  G. Toussaint Solving geometric problems with the rotating calipers , 1983 .

[6]  Jiri Matas,et al.  On Combining Multiple Segmentations in Scene Text Recognition , 2013, 2013 12th International Conference on Document Analysis and Recognition.

[7]  Venu Govindaraju,et al.  Analysis of textual images using the Hough transform , 1989, Machine Vision and Applications.

[8]  Boris Epshtein Determining Document Skew Using Inter-line Spaces , 2011, 2011 International Conference on Document Analysis and Recognition.

[9]  Horst Bunke,et al.  Document Image Analysis , 1994, Series in Machine Perception and Artificial Intelligence.

[10]  Jiri Matas,et al.  Text Localization in Real-World Images Using Efficiently Pruned Exhaustive Search , 2011, 2011 International Conference on Document Analysis and Recognition.

[11]  Jack Sklansky,et al.  Finding the convex hull of a simple polygon , 1982, Pattern Recognit. Lett..

[12]  Lawrence O'Gorman,et al.  Document Image Analysis , 1996 .

[13]  Changming Sun,et al.  Skew and slant correction for document images using gradient direction , 1997, Proceedings of the Fourth International Conference on Document Analysis and Recognition.