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@abuisman
Created November 3, 2011 22:39
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#Inside Photo model
has_attached_file :file,
:processors => [ :blurplates, :thumbnail ],
:styles => { :frontpage => "460x100000", :view => "740x100000", :medium => '300x300', :thumb => "100x100>" }
#blurplates.rb
# Load libs
require 'camellia'
require 'RMagick'
#include RMagick
#include Camellia
module Paperclip
# Handles thumbnailing images that are uploaded.
class Blurplates < Processor
def initialize(file, options = {}, attachment = nil)
# Make the file available to this class
@file = file
# Make an instance of the attachment available
@attachment = attachment.instance
# Make the basename of the file available
@basename = File.basename(file.path, File.extname(file.path))
end
# Make will actually work on the file and then return it
def make
logger.debug "The wheels on the bus go round and round"
# Create a new temporary file to work with
dst = Tempfile.new([@basename, 'bmp'].compact.join("."))
dst.binmode
# Open up the image in ImageMagick to convert it to a bmp.
image = Magick::Image.read(File.expand_path(file.path))
image.format = "BMP"
image.write(File.expand_path(dst.path))
# Load image into Camellia
carmage = CamImage.new
carmage.load_bmp(File.expand_path(dst.path))
yuv = image.to_yuv
# consider only the V plane (red)
yuv.set_roi(CamROI.new(3,0,0,yuv.width,yuv.height))
# threshold and encode
thr=yuv.encode_threshold(150)
# labeling
blobs=thr.labeling!
#puts "#{blobs.nb_blobs} blobs detected"
# draw rectangle on all detected blobs
blobs.each {|b| carmage.draw_rectangle(b.left,b.top,b.left+b.width-1,b.top+b.height-1,cam_rgb(255,0,0))}
# save the resulting picture
carmage.save_bmp(File.expand_path(dst.path))
# find out the biggest blob
sorted=blobs.sort {|a,b| b.surface<=>a.surface}
#puts "The bigger blob is at position (#{sorted[0].cx},#{sorted[0].cy}) and its surface is #{sorted[0].surface}"
# Load the image into ImageMagick again in order to convert it to a jpeg.
lastImage = Magick::Image.read(File.expand_path(dst.path))
lastImage.format = "JPG"
lastImage.write(File.expand_path(dst.path))
dst
end
end
end
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