Class: SigFil::VoxelGrid

Inherits:
Object
  • Object
show all
Defined in:
lib/sigfil/voxel_grid.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(dataset, leaf_size) ⇒ VoxelGrid

Returns a new instance of VoxelGrid.



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# File 'lib/sigfil/voxel_grid.rb', line 9

def initialize dataset, leaf_size
  @dataset   = dataset
  @leaf_size = leaf_size
  get_inverse_leaf_size
  
end

Instance Attribute Details

#dataset ⇒ Object

Returns the value of attribute dataset.



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# File 'lib/sigfil/voxel_grid.rb', line 6

def dataset
  @dataset
end

#leaf_size ⇒ Object

Returns the value of attribute leaf_size.



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# File 'lib/sigfil/voxel_grid.rb', line 7

def leaf_size
  @leaf_size
end

Instance Method Details

#apply_filter ⇒ Object 



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# File 'lib/sigfil/voxel_grid.rb', line 16

def apply_filter
  min, max = get_min_max

  bb_min, bb_max = get_bb(min, max)

  #div_b = bb_max.zip(bb_min).map {|x| x[0] - x[1] + 1}

  index = []
  @dataset.each_row do |pt|
    id = (pt*@inverse_leaf_size - bb_min).floor
    index << id.to_a
  end

  grid_idx = {}
  df = Daru::DataFrame.rows(index)
  #df.sort!(df.vectors)
  df.each_row_with_index do |row, id|
    grid_idx[row.to_a] ||= []
    grid_idx[row.to_a] << id
  end

  voxel_ary = []
  grid_idx.each do |g_id, d_id|
    ary = d_id.map {|i| @dataset.row(i).to_a}
    nm = NMatrix[*ary]
    voxel_ary << nm.mean(0).to_a
  end

  return NMatrix[*voxel_ary]
end

#get_bb(min, max) ⇒ Object

Get bounding box



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# File 'lib/sigfil/voxel_grid.rb', line 56

def get_bb min, max
  bb_min = (min*@inverse_leaf_size).floor
  bb_max = (max*@inverse_leaf_size).floor

  return bb_min, bb_max
end

#get_inverse_leaf_size ⇒ Object 



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# File 'lib/sigfil/voxel_grid.rb', line 67

def get_inverse_leaf_size
  @inverse_leaf_size = NMatrix[@leaf_size.map {|x| 1.0/x}]
end

#get_min_max ⇒ Object 



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# File 'lib/sigfil/voxel_grid.rb', line 47

def get_min_max
  min = @dataset.min(0)
  max = @dataset.max(0)

  return min, max
end