Table 3. Comparison of class-level accuracy with object detection methods (STD = standard deviation).

Method	Class-level accuracy	5-fold CV STD	# of failures with no class
SSD	33.98%	0.1351	23 images
Faster R-CNN with ResNet50	68.96%	0.0923	9 images
Our CNN model	94.55%	0.0104	-