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April 26, 2012 15:27
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win32screenshotで撮ったスクリーンショットをruby-opencvのCvMatに読み込む方法のベンチマーク
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# win32screenshotで撮ったスクリーンショットをruby-opencvのCvMatに読み込む方法のベンチマーク | |
# | |
# 環境: Windows 7, Core i5 2.4GHz, メモリ 4.0GB, ディスプレイ解像度 1280x800px | |
# ruby 1.9.3p125 (2012-02-16) [i386-mingw32], OpenCV 2.3.1 | |
# | |
# > ruby benchmark.rb | |
# (1) Bitmapデータを配列にしてset_dataで読み込む版 | |
# user system total real | |
# 1.934000 0.062000 1.996000 ( 2.061118) | |
# | |
# (2) 一旦一時ファイルに書き込んでから読み込む版 | |
# user system total real | |
# 0.000000 0.031000 0.031000 ( 0.020001) | |
require 'opencv' | |
require 'win32/screenshot' | |
require 'tempfile' | |
include OpenCV | |
require 'benchmark' | |
bitmap = Win32::Screenshot::Take.of(:desktop) | |
puts '(1) Bitmapデータを配列にしてset_dataで読み込む版' | |
puts Benchmark::CAPTION | |
puts Benchmark.measure { | |
byte = bitmap.bitmap | |
array = byte.unpack("x54C*") | |
data = Array.new | |
p = 0 | |
bitmap.height.times{ | |
bitmap.width.times{ | |
a = Array.new | |
a << array[p];p+=1; | |
a << array[p];p+=1; | |
a << array[p];p+=1; | |
data << a | |
} | |
# 4で割れないとき | |
amari = bitmap.height%4 | |
p += 4 - amari unless amari == 0 | |
} | |
i = CvMat.new(bitmap.height, bitmap.width, :cv8u, 3) | |
# i.set_data(data) # `set_data': no implicit conversion from nil to integer (TypeError) なのでコメントアウト | |
} | |
puts | |
puts '(2) 一旦一時ファイルに書き込んでから読み込む版' | |
puts Benchmark::CAPTION | |
puts Benchmark.measure { | |
Tempfile.open('bitmap') { |f| | |
f.binmode | |
f.write bitmap.bitmap | |
image = CvMat.load(f.path) | |
} | |
} |
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