Table 2.

Comparison of the number of images and classes used in previous studies with that of our study.

Method	The Number of Images	The Number of Classes (Including Two Sides and Two Directions)
[10]	65,700	48
[11]	140	28
[12]	15,000	24
[13,16]	2400	24
[14,15]	3600	24
[17]	3570	24
Our study	61,240	64