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視覚認知計算特論
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# -*- coding: utf-8 -*- | |
from __future__ import print_function | |
from __future__ import division | |
import numpy as np | |
import scipy as sp | |
import scipy.misc as spmisc | |
# 普通にPNG画像を読み込むやり方. | |
img = spmisc.imread( 'blackuni3.png' ) | |
# どんな大きさでどんなデータ型の配列(NumPyのndarray)に格納されるか確認 | |
print( 'img: ', img.shape, img.dtype ) | |
# 画素値を反転して出力 | |
spmisc.imsave( 'hoge.png', 255 - img ) | |
# 左右を反転した画像と元画像の平均を出力 | |
img2 = img[:, ::-1, :] | |
spmisc.imsave( 'hoge2.png', (img + img2)/2 ) | |
# ==> 画素値がオーバーフローして化け猫化 | |
# img を浮動小数点型に変換してやり直し | |
imgF = np.asarray( img, dtype = float ) | |
print( 'imgF:', imgF.shape, imgF.dtype ) | |
img2F = imgF[:, ::-1, :] | |
spmisc.imsave( 'hoge3.png', (imgF + img2F)/2 ) | |
# ==> 今度は問題ない | |
# catg/catXYZ.png は... | |
cat = spmisc.imread( 'catg/cat000.png' ) | |
print( 'cat: ', cat.shape, cat.dtype ) | |
# ==> グレイスケール形式のPNG画像なので,2次元配列 | |
# データ行列を作る & データ型を変換する | |
X = np.empty( ( 131, 64 * 64 ) ) # デフォルトの型すなわち float64 の配列を用意 | |
for i in range( 131 ): | |
cat = spmisc.imread( 'catg/cat%03d.png' % i ) | |
X[i, :] = cat.reshape( -1 ) | |
print( 'X: ', X.shape, X.dtype ) | |
# (おまけ) PNG画像を読み込むと同時にグレイスケール化 | |
imgG = spmisc.imread( 'blackuni3.png', flatten = True ) | |
print( 'imgG:', imgG.shape, imgG.dtype ) |
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