Class: KvgCharacterRecognition::HeatmapFeature

Inherits:
Object
  • Object
show all
Includes:
NonStructuralFeature
Defined in:
lib/kvg_character_recognition/heatmap_feature.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from NonStructuralFeature

#smooth

Constructor Details

#initialize(bi_normed, ld_normed, pd_normed, size, number_of_grids, weights = [1/9.0, 1/9.0, 1/9.0, 1/9.0, 1/9.0, 1/9.0, 1/9.0, 1/9.0, 1/9.0]) ⇒ HeatmapFeature

Returns a new instance of HeatmapFeature.



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# File 'lib/kvg_character_recognition/heatmap_feature.rb', line 5

def initialize bi_normed, ld_normed, pd_normed, size, number_of_grids, weights=[1/9.0, 1/9.0, 1/9.0, 1/9.0, 1/9.0, 1/9.0, 1/9.0, 1/9.0, 1/9.0]
  @size = size
  @number_of_grids = number_of_grids
  @number_of_points = bi_normed.flatten(1).count
  @weights = weights
  @heatmaps = smooth(generate_heatmaps(bi_normed, ld_normed, pd_normed))
end

Instance Attribute Details

#heatmaps ⇒ Object

Returns the value of attribute heatmaps.



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# File 'lib/kvg_character_recognition/heatmap_feature.rb', line 4

def heatmaps
  @heatmaps
end

#number_of_grids ⇒ Object

Returns the value of attribute number_of_grids.



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# File 'lib/kvg_character_recognition/heatmap_feature.rb', line 4

def number_of_grids
  @number_of_grids
end

#size ⇒ Object

Returns the value of attribute size.



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# File 'lib/kvg_character_recognition/heatmap_feature.rb', line 4

def size
  @size
end

#weights ⇒ Object

Returns the value of attribute weights.



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# File 'lib/kvg_character_recognition/heatmap_feature.rb', line 4

def weights
  @weights
end

Instance Method Details

#generate_heatmaps(bi_normed, ld_normed, pd_normed) ⇒ Object 



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# File 'lib/kvg_character_recognition/heatmap_feature.rb', line 13

def generate_heatmaps bi_normed, ld_normed, pd_normed

  grid_size = size / @number_of_grids.to_f

  map = Map.new @number_of_grids, @number_of_grids, [0, 0, 0]

  #fill the heatmap
  bi_normed.each do |stroke|
    stroke.each do |point|
      grid1 = [(point[0] / grid_size).floor, (point[1] / grid_size).floor]

      map[grid1[0], grid1[1]] = [map[grid1[0], grid1[1]][0] + (1 / @number_of_points.to_f).round(4),
                                 map[grid1[0], grid1[1]][1],
                                 map[grid1[0], grid1[1]][2]] if grid1[0] < @number_of_grids && grid1[1] < @number_of_grids
    end
  end
  ld_normed.each do |stroke|
    stroke.each do |point|
      grid2 = [(point[0] / grid_size).floor, (point[1] / grid_size).floor]

      map[grid2[0], grid2[1]] = [map[grid2[0], grid2[1]][0],
                                 map[grid2[0], grid2[1]][1] + (1 / @number_of_points.to_f).round(4),
                                 map[grid2[0], grid2[1]][2]] if grid2[0] < @number_of_grids && grid2[1] < @number_of_grids
    end
  end
  pd_normed.each do |stroke|
    stroke.each do |point|
      grid4 = [(point[0] / grid_size).floor, (point[1] / grid_size).floor]

      map[grid4[0], grid4[1]] = [map[grid4[0], grid4[1]][0],
                                 map[grid4[0], grid4[1]][1],
                                 map[grid4[0], grid4[1]][2] + (1 / @number_of_points.to_f).round(4)] if grid4[0] < @number_of_grids && grid4[1] < @number_of_grids
    end
  end
  map
end