Created
June 17, 2014 10:37
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画像が白系かどうかを判定。
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| require 'RMagick' | |
| NUM_COLORS = 16 | |
| HIST_HEIGHT = 200 | |
| img = Magick::Image.read('public/upload_images/d1/a5/d1a50562ce7d25930bc5d4b527aec38b.png').first | |
| img = img.quantize(NUM_COLORS, Magick::GRAYColorspace) | |
| #img = img.quantize(NUM_COLORS) | |
| hist = img.color_histogram | |
| # sort pixels by increasing count | |
| pixels = hist.keys {|pixel| hist[pixel] } | |
| pixels.each { |pixel| | |
| puts pixel, hist[pixel] | |
| } | |
| puts "last v" | |
| puts hist[pixels.last] | |
| total = 0 | |
| hist.values.each { |v| total += v } | |
| puts "total", total | |
| r = hist[pixels.last].to_f / total.to_f | |
| puts r | |
| if r > 0.2 | |
| puts "white base" | |
| else | |
| puts "not white base" | |
| end | |
| scale = HIST_HEIGHT / (hist.values.max*1.025) # put 2.5% air at the top | |
| gc = Magick::Draw.new | |
| gc.stroke_width(1) | |
| gc.affine(1, 0, 0, -scale, 0, HIST_HEIGHT) | |
| # handle images with fewer than NUM_COLORS colors | |
| start = NUM_COLORS - img.number_colors | |
| pixels.each { |pixel| | |
| gc.stroke(pixel.to_color) | |
| gc.line(start, 0, start, hist[pixel]) | |
| start = start.succ | |
| } | |
| hatch = Magick::HatchFill.new("white", "gray95") | |
| canvas = Magick::Image.new(NUM_COLORS, HIST_HEIGHT, hatch) | |
| gc.draw(canvas) | |
| text = Magick::Draw.new | |
| #text.annotate(canvas, 0, 0, 0, 20, "Color Frequency\nHistogram") { | |
| # self.pointsize = 10 | |
| # self.gravity = Magick::NorthGravity | |
| # self.stroke = 'transparent' | |
| # } | |
| canvas.border!(1, 1, "white") | |
| canvas.border!(1, 1, "black") | |
| canvas.border!(3, 3, "white") | |
| canvas.write("color_histogram.gif") | |
| exit |
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