Table 6. The selected RNN architecture. 4 bidirectional layers are utilized with two operating vertically and two horizontally. Each layer contains 16 filters per pass for a total of 32 filters each.

Layer Architecture	Receptive Field	Filters (/ pass)
Vertical Bidirectional	1x1	16
Horizontal Bidirectional	1x1	16
Vertical Bidirectional	2x2	16
Horizontal Bidirectional	2x2	16