utils.py 文件源码

def box_to_affine(xc, yc, angle, scalex, aspect):

  m = np.zeros((2, 3), np.double )

  m[0,0] = scalex * math.cos(angle)
  m[1,0] = scalex * math.sin(angle) 
  m[0,1] = - scalex * math.sin(angle) * aspect
  m[1,1] = scalex * math.cos(angle) * aspect
  m[0,2] = xc 
  m[1,2] = yc 

  return m