code: def process_image(self, padded_src, dpi):
      ox, oy = self.offsets
      a1 = np.roll(padded_src, int(ox / 72 * dpi), axis=1)
      a2 = np.roll(a1, -int(oy / 72 * dpi), axis=0)
      return a2
  
imports: import matplotlib.pyplot
  import numpy
  from matplotlib.artist import Artist
  import matplotlib.cm
  from matplotlib.colors import LightSource
  import matplotlib.transforms
label_desc: Use image node_id 3 for calling the OffsetFilter obj's underlying member method code with example usage: obj.process_image(padded_src, dpi) and returns: a2