docs: def integrate(ii, r0, c0, r1, c1):
      """
      Use an integral image to integrate over a given window.
  
      Parameters
      ----------
      ii : ndarray
          Integral image.
      r0, c0 : int
          Top-left corner of block to be summed.
      r1, c1 : int
          Bottom-right corner of block to be summed.
  
      Returns
      -------
      S : int
          Integral (sum) over the given window.
  
      """
      # This line is modified
      S = np.zeros(ii.shape[-1])
  
      S += ii[r1, c1]
  
      if (r0 - 1 >= 0) and (c0 - 1 >= 0):
          S += ii[r0 - 1, c0 - 1]
  
      if (r0 - 1 >= 0):
          S -= ii[r0 - 1, c1]
  
      if (c0 - 1 >= 0):
          S -= ii[r1, c0 - 1]
  
      return S