ImageProcessing examples

external_library/java/image_processing/README.md

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+The [image_processing library][image_processing] was created by [Nick 'Milchreis' Müller][Milchreis] and needs to be installed in your `~/.propane/libraries`, NB I use the convention of converting
+camelcase names to snakecase, I suggest you do the same for your propane libraries.
+
+[image_processing]:https://github.com/Milchreis/processing-imageprocessing
+[Milchreis]:https://milchreisjunkie.wordpress.com/

external_library/java/image_processing/basics.rb

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+#!/usr/bin/env jruby -v -W2
+require 'propane'
+
+# Example for basic image processing algorithms.
+# Use the mouse wheel to switch the different algorithms
+# and press the left mouse button to see the original image.
+#
+# Author: Nick 'Milchreis' Müller
+class BasicImageProcessing < Propane::App
+
+  load_library :image_processing
+
+  include_package 'milchreis.imageprocessing'
+
+  NUMBER_OF_ALGORITHMS = 11
+  attr_reader :current_algorithm, :processed_image, :my_image
+
+  def settings
+    size(550, 550)
+  end
+
+  def setup
+    sketch_title 'Image Processing'
+    @my_image = loadImage(data_path('example.jpg'))
+    @current_algorithm = 0
+  end
+
+  def draw
+    return image(my_image, 0, 0) if mouse_pressed?
+
+    # Grayscale converts the image in to 256 shades of gray
+    case current_algorithm
+    when 0
+      @processed_image = Grayscale.apply(my_image)# if current_algorithm == 0
+
+      # Threshold converts a pixel in bright or dark for a specific color value
+    when 1
+      # automatic
+      # @processed_image = Threshold.apply(my_image)
+      # by mouseX
+      @processed_image = Threshold.apply(my_image, map1d(mouse_x, 0..width, 0..255))
+    when 2, 3, 10
+      quant = map1d(mouse_x, 0..width, 1..10)
+      if current_algorithm == 10
+        @processed_image = Quantization.apply(my_image, quant)
+      else
+        @processed_image = Threshold.apply(my_image)
+        if current_algorithm == 2
+          # Dilation expands the white regions by a radius
+          # works best with threshold/binary images
+          @processed_image = Dilation.apply(processed_image, quant)
+        else
+          # Erosion expands the dark regions by a radius
+          # works best with threshold/binary images
+          @processed_image = Erosion.apply(processed_image, quant)
+        end
+      end
+      # Brightness correction
+    when 4
+      intensity = map1d(mouse_x, 0..width, -255..255)
+      @processed_image = Brightness.apply(my_image, intensity)
+      # AutoBalance for simple color correction
+    when 5
+      @processed_image = AutoBalance.apply(my_image)
+
+      # Pixelation
+    when 6
+      pixelsize = map1d(mouse_x, 0..width, 0..100)
+      @processed_image = Pixelation.apply(my_image, pixelsize)
+
+      # Gaussian for blurred images
+    when 7
+      @processed_image = Gaussian.apply(my_image, 7, 0.84089642)
+
+      # Edge detection with Canny's algorithm
+    when 8
+      @processed_image = CannyEdgeDetector.apply(my_image)
+
+      # Edge detection with Sobel's algorithm
+    when 9
+      # SobelEdgeDetector.apply(image, false) creates a colored image
+      @processed_image = SobelEdgeDetector.apply(my_image)
+    end
+    # show image
+    image(processed_image, 0, 0)
+  end
+
+  def mouseWheel(event) # keep camelcase poxy reflection
+    @current_algorithm += event.getCount
+    @current_algorithm = 0 if current_algorithm >= NUMBER_OF_ALGORITHMS
+    @current_algorithm = NUMBER_OF_ALGORITHMS - 1 if current_algorithm < 0
+  end
+end
+
+BasicImageProcessing.new

external_library/java/image_processing/dithering.rb

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+#!/usr/bin/env jruby -v -W2
+require 'propane'
+
+# Example for dithering an image to get a retro look.
+#
+# Use the mouse wheel to change the dithering algorithm
+# and press spacebar to show it in gray scale for the perfect
+# retro look.
+#
+# Author: Nick 'Milchreis' Müller
+class DitheringSketch < Propane::App
+  load_library :image_processing
+  java_import 'milchreis.imageprocessing.Dithering'
+  java_import 'milchreis.imageprocessing.Grayscale'
+  attr_reader :my_image, :processed, :label, :index
+
+  def settings
+    size(550, 550)
+  end
+
+  def setup
+    sketch_title 'Dithering'
+    @index = 0
+    @my_image = load_image(data_path('example.jpg'))
+  end
+
+  def draw
+    @processed = my_image
+    @label = ''
+    if key_pressed? && key == ' '
+      @processed = Grayscale.apply(processed)
+    end
+    return image(my_image, 0, 0) if mouse_pressed?
+    case index
+    when -1
+      @processed = Dithering.apply(processed)
+      @label = 'BAYER_4x4 on default'
+    when 0
+      @processed = Dithering.apply(processed, Dithering::Algorithm::BAYER_2x2)
+      @label = 'BAYER_2x2'
+    when 1
+      @processed = Dithering.apply(processed, Dithering::Algorithm::BAYER_4x4)
+      @label = 'BAYER_4x4'
+    when 2
+      @processed = Dithering.apply(processed, Dithering::Algorithm::BAYER_8x8)
+      @label = 'BAYER_8x8'
+    end
+    image(processed, 0, 0)
+    fill(0)
+    text(label, width / 2 - text_width(label) / 2, 30)
+  end
+
+  def mouseWheel(event)
+    @index += event.get_count
+
+    if index >= Dithering::Algorithm.values.length
+      @index = -1
+    end
+  end
+end
+
+DitheringSketch.new

external_library/java/image_processing/glitch_example.rb

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+#!/usr/bin/env jruby -v -W2
+require 'propane'
+
+# Example for an artificial glitch effect.
+# Move the mouse from left to right to see different intensity
+# or press the left mouse button to see the original image.
+#
+# Author: Nick 'Milchreis' Müller
+# Translated to JRubyArt by Martin Prout
+class GlitchExample < Propane::App
+  load_library :image_processing
+  java_import 'milchreis.imageprocessing.Glitch'
+
+  attr_reader :my_image
+
+  def setup
+    sketch_title 'Glitch'
+    # Load image
+    @my_image = load_image(data_path('example.jpg'))
+  end
+
+  def draw
+    return image(my_image, 0, 0) if mouse_pressed?
+    intensity = map1d(mouseX, 0..width, 0..4)
+    image(Glitch.apply(my_image, intensity), 0, 0)
+    # You can also use:
+    # Glitch.apply(image)
+    # Glitch.apply(image, intensity, scanlineHeight)
+  end
+
+  def settings
+    size(550, 550)
+  end
+end
+
+GlitchExample.new

external_library/java/image_processing/halftone_example.rb

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+#!/usr/bin/env jruby -v -W2
+require 'propane'
+
+# Example for halftone an image to get a old school print look.
+#
+# The dot size can be changed by moving the mouse left and right.
+# The spacing between the dots can be changed by moving the mouse up and down.
+# If you press the mouse button the dots will be shown in a grid.
+#
+# Author: Nick 'Milchreis' Müller
+class HalfTone < Propane::App
+  load_library :image_processing
+  java_import 'milchreis.imageprocessing.Halftone'
+  attr_reader :my_image
+
+  def settings
+    size(550, 550)
+  end
+
+  def setup
+    sketch_title 'Half Tone'
+    # Load image
+    @my_image = load_image(data_path('example.jpg'))
+  end
+
+  def draw
+    # Simple usage:
+    # image = Halftone.apply(image, dotsize)
+
+    # dotsize by mouseX
+    dotsize = map1d(mouseX, 0..width, 3..10)
+
+    # dots in grid or honeycomb style by mousePressed
+    inGrid = mouse_pressed?
+
+    # Foreground color
+    foreground = '#335764'
+
+    # Space between dots by mouseY
+    space = map1d(mouseY, 0..height, 1..3)
+
+    # Draw image
+    image(Halftone.apply(my_image, dotsize, color(foreground), 255, space, inGrid), 0, 0)
+  end
+end
+
+HalfTone.new

external_library/java/image_processing/lut_example.rb

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+#!/usr/bin/env jruby -v -W2
+require 'propane'
+
+# Example for lookup tables (LUT).
+# Use the mouse wheel to switch the different tables/styles
+# and press the left mouse button to see the original image.
+#
+# Author: Nick 'Milchreis' Müller
+# Translated to JRubyArt by Martin Prout
+class LUTExample < Propane::App
+  load_library :image_processing
+  java_import 'milchreis.imageprocessing.LUT'
+
+  attr_reader :my_image, :lookuptables, :current_index, :enums
+
+  def settings
+    size(550, 550)
+  end
+
+  def setup
+    sketch_title 'LUT Example'
+    @current_index = 0
+    # Load image
+    @my_image = load_image(data_path('example.jpg'))
+    # Create an array with all lookup-tables
+    # LUT Styles:
+    # RETRO, CONTRAST, CONTRAST_STRONG, ANALOG1, WINTER, SPRING, SUMMER, AUTUMN
+    @enums = LUT::STYLE.values
+    @lookuptables = enums.map do |enum|
+      LUT.load_lut(enum.java_object)
+    end
+    # Load one style:
+    # LUT style = LUT.loadLut(LUT.STYLE.ANALOG1)
+  end
+
+  def draw
+    return image(my_image, 0, 0) if mouse_pressed?
+    image(LUT.apply(my_image, lookuptables[current_index]), 0, 0)
+    fill(0)
+    stylename = enums[current_index].name
+    text(stylename, width / 2 - textWidth(stylename) / 2, 30)
+  end
+
+  def mouseWheel(event) # keep camelcase for poxy java reflection
+    @current_index += 1
+    @current_index = 0 if current_index >= lookuptables.length
+  end
+end
+
+LUTExample.new

external_library/java/image_processing/sharpen.rb

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+#!/usr/bin/env jruby -v -W2
+require 'propane'
+
+# Example for sharpening an image to get a crunchy look.
+# The intensity of this effect increases slowly.
+# Press the left mouse button to see the original image.
+#
+# Author: Nick 'Milchreis' Müller
+class Sharpening < Propane::App
+  load_library :image_processing
+
+  java_import 'milchreis.imageprocessing.Sharpen'
+
+  attr_reader :my_image, :sharp_intensity
+
+  def settings
+    size(550, 550)
+  end
+
+  def setup
+    sketch_title 'Sharpen'
+    @sharp_intensity = 0
+    @my_image = load_image(data_path('example.jpg'))
+  end
+
+  def draw
+    return image(my_image, 0, 0) if mouse_pressed?
+    image(Sharpen.apply(my_image, sharp_intensity), 0, 0)
+    # Reset the intensity or increase it
+    @sharp_intensity = (sharp_intensity > 6) ? 0 : sharp_intensity + 0.05
+  end
+end
+
+Sharpening.new

external_library/java/image_processing/stacker.rb

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+#!/usr/bin/env jruby -v -W2
+require 'propane'
+
+# Example for stacking images.
+# Generates an average face by 10 example faces.
+# Normally the median pixel is selected.
+# Use the mouse button to see the average mode.
+#
+# Author: Nick 'Milchreis' Müller
+class Stacking < Propane::App
+
+  load_library :image_processing
+  java_import 'milchreis.imageprocessing.Stacker'
+
+  # Dimensions for each face
+  GRID_WIDTH = 128
+  GRID_HEIGHT = 155
+  attr_reader :faces
+
+  def settings
+    size(128, 155)
+  end
+
+  def setup
+    sketch_title 'Stacker'
+    # Load faces grid
+    yale_faces = load_image(data_path('yaleBfaces.jpg'))
+    @faces = []
+    grid(yale_faces.width, yale_faces.height, GRID_WIDTH, GRID_HEIGHT) do |x, y|
+      faces << yale_faces.get(x, y, GRID_WIDTH, GRID_HEIGHT)
+    end
+  end
+
+  def draw
+    faces_java = faces.to_java(Java::ProcessingCore::PImage)
+    # Alternative algorithm is average
+    return image(Stacker.apply(Stacker::ALGORITHM::AVERAGE, faces_java), 0, 0) if mouse_pressed?
+    # Default algorithm is median
+    image(Stacker.apply(faces_java), 0, 0)
+    # The array is not essential. If you save your images in different variables use this:
+    # Stacker.apply(image1, image2, image3) # works also
+  end
+end
+
+Stacking.new