def TaylorSubpixel(params):
    a,b,c,_,e,f,g,_ = params
    s = -e/(2*a)
    x = -f/(2*b)
    y = -g/(2*c)
    return s,x,y
a*s*s + b*x*x + c*y*y + d*x*y + e*s + f*x + g*y + h
dataset/ETHPy150Open bolme/pyvision/src/pyvision/point/DetectorDOG.py/TaylorSubpixel