Figure 12
From: SWT voting-based color reduction for text detection in natural scene images
SWT direction determination examples. (a, b, c) Original images. (d, e, f) SWT directions obtained using the upper SWT boundary. Note how the method correctly determines the SWT direction of images (a) and (b) even when both dark text on light background and light text on dark background appear simultaneously. The method is unable to detect the ‘www.mservis.si’ part of image (c) since it lies inside the rectangular area with SWT rays bumping into it thus creating a character-like structures.