Class: Eikon::ImageProcessor

Inherits:
Object
  • Object
show all
Extended by:
T::Sig
Defined in:
lib/eikon/image_processor.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(filename) ⇒ ImageProcessor

Returns a new instance of ImageProcessor.



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# File 'lib/eikon/image_processor.rb', line 18

def initialize(filename)
  @filename = filename
  @image = T.let(Vips::Image.new_from_file(filename), Vips::Image)
  @byte_array = T.let("", String)
end

Instance Attribute Details

#byte_array ⇒ Object (readonly)

Returns the value of attribute byte_array.



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# File 'lib/eikon/image_processor.rb', line 12

def byte_array
  @byte_array
end

#filename ⇒ Object (readonly)

Returns the value of attribute filename.



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# File 'lib/eikon/image_processor.rb', line 15

def filename
  @filename
end

Instance Method Details

#generate_byte_array ⇒ Object 



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# File 'lib/eikon/image_processor.rb', line 39

def generate_byte_array
  for y in  0..7 do
    for x in 0..7 do
      @byte_array += T.unsafe(@image).getpoint(x, y)[0] < T.unsafe(@image).getpoint((x + 1), y)[0] ? "1" : "0"
    end
  end

  nil
end

#preprocess_image ⇒ Object 



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# File 'lib/eikon/image_processor.rb', line 25

def preprocess_image
  # Black and white
  @image = T.unsafe(@image).colourspace "b-w"
  # For some reason thumbnail is only created via a buffer, so we save one quick
  image_buffer = @image.write_to_buffer ".tiff"
  # shrink image
  @image = T.unsafe(Vips::Image).thumbnail_buffer(image_buffer, 9, height: 8, size: :force)
  image_buffer = @image.write_to_buffer ".tiff"
  @image = Vips::Image.new_from_buffer(image_buffer, "")

  nil
end