(PECL imagick 2, PECL imagick 3)
Imagick::getImageInterpolateMethod — Returns the interpolation method
   Returns the interpolation method for the specified image. The method is one of 
   the Imagick::INTERPOLATE_* constants.
  
此函数没有参数。
Returns the interpolate method on success.
错误时抛出 ImagickException。