Figure 7From: SWT voting-based color reduction for text detection in natural scene images Examples of SWT sub-blocks with and without upper SWT boundary. Examples of (a) SWT SB + and (b) SWT SB + sub-blocks without upper SWT boundary and (c) SWT SB + and (d) SWT SB − sub-blocks with upper SWT boundary, where α=0.33. Corresponding SWT histograms are depicted in the bottom row: (e) f=263.2, (f) f=119.1, (g) f=85.9, (h) f=133.1.Back to article page