Class: Percept::FieldDetector

Inherits:
Object
  • Object
show all
Defined in:
lib/percept/field_detector.rb

Instance Method Summary collapse

Instance Method Details

#detect_field(line, image) ⇒ Object 



16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
 
# File 'lib/percept/field_detector.rb', line 16

def detect_field(line, image)
  stopping_point = [0, line.start_y - Percept.config.max_field_height].max
  starting_point = line.start_y - 2
  min_index = line.start_y - Percept.config.min_field_height

  return nil unless min_index >= 0

  buffered_start  = line.start_x + Percept.config.field_edge_buffer
  buffered_length = line.length - 2 * Percept.config.field_edge_buffer

  starting_point.downto(stopping_point) do |index|
    pixels = image.get_pixels(buffered_start, index, buffered_length, 1)
    blackish_pixel = pixels.any?(&:blackish?)

    if index >= min_index && blackish_pixel
      return nil
    elsif blackish_pixel
      return Percept::Field.new(
        start_x: line.start_x,
        end_x: line.end_x,
        start_y: index + 1,
        end_y: line.start_y,
        line: line,
        image: image,
      )
    end
  end

  Percept::Field.new(
    start_x: line.start_x,
    end_x: line.end_x,
    start_y: stopping_point,
    end_y: line.start_y,
    line: line,
    image: image,
  )
end

#detect_fields(image) ⇒ Object 



5
6
7
8
9
10
11
12
13
14
 
# File 'lib/percept/field_detector.rb', line 5

def detect_fields(image)
  field_collection = FieldCollection.new

  image.filtered_lines.map do |line|
    field = detect_field(line, image)
    field_collection << field if field
  end

  field_collection
end