Class: Ocarina::LetterpressCropper

Inherits:
Object
  • Object
show all
Includes:
Util
Defined in:
lib/ocarina/letterpress_cropper.rb

Overview

creates tiles of character images from letterpress game boards

Instance Method Summary collapse

Methods included from Util

#char_to_binary_string, #filename_for_noise_image, #filename_for_quantized_image, #filename_for_training_image, #int_to_binary_string, #is_lower?, #is_upper?, #noise_image_for_char, #pixel_number_to_col, #pixel_number_to_row, #pixel_to_bit, #quantize_image, #reference_image_for_char, #sigma

Constructor Details

#initialize(config) ⇒ LetterpressCropper

Returns a new instance of LetterpressCropper.



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# File 'lib/ocarina/letterpress_cropper.rb', line 17

def initialize(config)
  @config = config
end

Instance Method Details

#crop(image) ⇒ Object

returns an N by N array of image tiles



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# File 'lib/ocarina/letterpress_cropper.rb', line 44

def crop(image)
  if image.columns != LETTERPRESS_EXPECTED_WIDTH || image.rows != LETTERPRESS_EXPECTED_HEIGHT
    image = image.resize(LETTERPRESS_EXPECTED_WIDTH, LETTERPRESS_EXPECTED_HEIGHT)
  end

  image = quantize_image(image)

  y_offset = LETTERPRESS_HEIGHT_OFFSET

  rows = [ ]

  border = 1

  0.upto(LETTERPRESS_TILES_DOWN - 1) do
    x_offset = 0
    row = [ ]

    0.upto(LETTERPRESS_TILES_ACROSS - 1) do

      tile = image.crop(x_offset - border, y_offset + border, LETTERPRESS_TILE_PIXELS - border, LETTERPRESS_TILE_PIXELS - border, true)
      box = tile.bounding_box
      min_bound_width = 0.75 * @config.char_width
      if box.width > min_bound_width
        tile = tile.crop(box.x - border, box.y - border, box.width + 2 * border, box.height + 2 * border, true)
      end

      tile.resize!(@config.char_width, @config.char_height)
      row << tile
      x_offset += LETTERPRESS_TILE_PIXELS

    end
    rows << row

    y_offset += LETTERPRESS_TILE_PIXELS
  end

  rows
end

#decipher_board(network, board_image) ⇒ Object

crops the board into tiles, runs recognizer on each of the tiles, and returns resulting array of array of chars



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# File 'lib/ocarina/letterpress_cropper.rb', line 24

def decipher_board(network, board_image)
  tile_rows = crop board_image

  result = [ ]

  tile_rows.each do |tile_row|
    row = [ ]
    tile_row.each do |tile|
      row << network.recognize(tile).chr
    end

    result << row
  end

  result
end