Deepselect

require 'rmagick'
require "deepselect"

# 5 coffeeshop logo images (famous in Japan)
image_list = [
	"logo_doutor.jpg", "logo_stmarc.png",
	"logo_komeda.jpeg", "logo_starbucks.png",
	"logo_tully's.jpg"
]

# Read Image
images = image_list.map do |name|
	image_dir = "./images/"+name
	image = Magick::Image.read(image_dir).first
end

# Read another Starbucks Image
starbucks_image = Magick::Image.read("./images/image_starbucks.png").first
puts "input: #{"./images/image_starbucks.png"} " # => ".images/image_starbucks.png"

# Search the array for the image most similar to the given image
selected_image = images.dselect{|dimage| dimage == starbucks_image}
puts "most similar image: #{selected_image.filename}" # => ".images/logo_starbucks.png"

stmark_photo_image = Magick::Image.read("./images/photo_stmarc.jpg").first
selected_image = images.dselect(take: 2, with: "similarity"){|dimage| dimage == stmark_photo_image}
p selected_image
# => [
#       [./images/logo_stmarc.png PNG 542x542 542x542+0+0 DirectClass 8-bit 372kb,  0.9097266348649801],
#       [./images/logo_tully's.jpg JPEG 667x666 667x666+0+0 DirectClass 8-bit 72kb, 0.6602779726625289]
# ]

images.dinit # calc feature vector

selected_image = images.dselect{|dimage| dimage == compare_image}