Text recognition - Generate directional feature vectors for ERs

[ddetone]

Generate the 200-dimensional feature vector for each ER to prepare the ER for character classification.

1.) Normalize to 35 x 35, preserving aspect ratio and centroid
2.) Split into 8 bit maps where each bit map corresponds to orientations of boundary pixels
3.) Apply Gaussian blurring
4.) Vectorize

From "A Method for Text Localization and Recognition in Real-World Images", Section 3.5.