Algorithm 1 Adaptive image scaling.

Input: $W$ and $H$ are the width and height of the input image.

$T_W$ and $T_H$ are the width and height of the object image of standard size.

Begin

$scaling\_ratio\leftarrow \min \{T_W/W,T_H/H\}$  $new\_w\leftarrow W\times scaling\_ratio$  $new\_h\leftarrow H\times scaling\_ratio$  $d_w\leftarrow T_W-new\_w$  $d_h\leftarrow T_H-new\_h$  $d\leftarrow \mathrm{mod}(\max (d_w,d_h),64)$  $padding\leftarrow d/2$

if $(W,H)\ne (neww\_,new\_h)$: $image\leftarrow resize(input\_image,(new\_w,new\_h))$  $new\_image\leftarrow add\_border(image,(padding,padding))$

End Output: $new\_image$