docstr: A sixteenth-sized version of the frame (quarter-width, quarter-height)
docstr_tok: ["A","sixteenth-sized","version","of","the","frame","(","quarter-width",",","quarter-height",")"]
code: def quarter_resolution_frame(self):
      """A sixteenth-sized version of the frame (quarter-width, quarter-height)"""
  
      if "quarter" not in self.frame_variants:
          self.frame_variants["quarter"] = self._to_quarter_resolution()
  
      return self.frame_variants["quarter"]
  
imports: import skimage.color
  import skimage.measure
  import skimage.transform
  import skimage.filters
  import skimage.morphology
  import numpy
  import io
  from PIL import Image
label_desc: Use image node_id 4 for calling the GameFrame obj's underlying member method code with example usage: obj.quarter_resolution_frame() and returns: self