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【Python】複数の画像の代表値をとる【Numpy】

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目的

複数の画像の各ピクセルの代表値を使って画像を生成する。
例えば10枚の画像の平均画像を作りたい。

準備

ライブラリのImport

import numpy as np
from scipy import stats

画像

10枚のRGB画像。
10枚の平均画像、中央値画像、最頻値画像をそれぞれ生成する。

imgs.shape    # (10, 128, 128, 3)

平均

x.shapeでaxisに設定したい軸を確認できる。

img_mean = np.mean(imgs, axis=0)
img_mean.shape    # (128, 128, 3)

中央値

img_median = np.median(imgs, axis=0)
img_median.shape    # (128, 128, 3)

最頻値

numpyに最頻値を求めるライブラリがないのでscipy。
他にいい方法あるかも。

# 返値がmodeとcountの2つあるのでmodeだけ拾う
img_mode = stats.mode(imgs, axis=0)[0]

# 形を他の代表値画像と合わせる
img_mode.shape    # (1, 128, 128, 3)
img_mode = img_mode.reshape(128, 128, 3)

img_mode.shape    # (128, 128, 3)
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