Table 1. Image data sets [1], [3], [4].

Data sets	Number of images	sizes (pixel)
Face	435	Different sizes
Face-easy	435	Different sizes
Car-side	123	300*190
Airplane	800	Different sizes
Motorcycle	800	Different sizes
Car (rear)	526	360*240
Leaf	186	896*592
Leopard	200	Different sizes