SlideShare a Scribd company logo
June 2
Yamamoto laboratory
M1 SHIDOYusuke
1
Cinderella GAN
2
• 背景と目的
– 現在のキャラデザイン:デザイナー
• 人件費,完成までの時間 がかかる
→ 才能がいらない・時間がかからないキャラデザイン
• 手段と結果
– DCGAN(Deep ConvolutionalGAN) [Radford+, 2015]
によりキャラクターを自動生成
– それらしい画像の生成に成功
概要
3
1. 現存するキャラクターのセットからそれらしい
画像を生成する
1. 入力:
1. ランダムノイズ
2. 現存のキャラクター画像
2. 出力:
1. それらしい画像
2. 生成したキャラクターを調節する
目標
4
• 「アイドルマスターシンデレラガールズ」
に登場するアイドル203名
4500枚 × (回転・拡大縮小) = 27000枚
データセット
5
GAN [Goodfellow+, 2014]
• 概念図 教師データ
ランダムノイズ
• Generator
入力: ランダムノイズ
出力: 画像
• Discriminator
入力: 画像
出力: 画像がX,Zに
よるものである確率
相互学習
6
Generator
Network
Discriminator
• 各層にbatch-normalization
• average-pooling
• Discriminatorにleaky-LeRU
• 各層係数0.0001でL2正規化
7
• Discriminatorの予測:
– 本物 → 1
– 偽物 → 0
• DiscriminatorのLoss: −log 𝐷 𝑥 − log(1 − 𝐷(𝐺 𝑧 ))
• GeneratorのLoss: − log(𝐺 𝑧 )
• Adam optimizer 学習率0.0002で学習
• バッチサイズ 128
学習
8
• Epoch1
学習
9
• Epoch10
学習
10
• Epoch50
学習
11
• Epoch50
学習
12
• Epoch200
学習
13
• Epoch2000
学習
14
• Lossが小さかった生成画像
結果
15
• ノイズを内分
生成画像の調節
→ 中間の画像を作ることができる
16
• 画像の特徴を作るノイズの特定
– 例: 金髪の画像を集めてノイズの平均を取る → 金髪成分
生成画像の調節
17
• 画像の特徴を作るノイズの特定
– 例: 金髪の画像を集めてノイズの平均を取る → 金髪成分
– 金髪成分を足して正規化
生成画像の調節
元 →
+金髪→
-金髪→
18
• 画像の特徴を作るノイズの特定
– 例: 金髪の画像を集めてノイズの平均を取る → 金髪成分
– 金髪成分を足して正規化
• なぜ正規化するのか
– ノイズの角から生成される画像は見た目が良くない
• 良い画像2枚の内分は良い画像→中心に近いと◎
• 元の論文では引き算を挟んでいた
生成画像の調節
19
1. 現存するキャラクターのセットからそれらしい
画像を生成する
→ それらしいものを大量に生成できるようになった
2. 生成したキャラクターを調節する
→ 人力で成分を特定すれば調節ができるようになった
結果

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Idolmaster with DCGAN