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Dimensionality reduction with side information for image classification
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Dimensionality reduction with side information for image classification
1.
Dimensionality Reduction with
Side Information for Image Classification の紹介 西村仁志 2013/9/3
2.
論文について "Dimensionality reduction with
side information for image classification“ Alejandro Marcos Alvarez, Makoto Yamada, Akisato Kimura 画像の認識・理解シンポジウム (MIRU2013)
3.
1. Introduction ・画像の見え方のみで画像識別するのは難しい ・画像に付与されたタグや,Webのリンク構造を考慮し た手法が出てきている 問題:画像識別にしか使えない 提案:次元削減を通じて画像の付加情報を利用する, 一般的なアプローチ. LFDA(Local Fisher
Discriminant Analysis)を改良 利点:・次元削減しても精度が落ちない ・画像識別以外でも使える
4.
2. Problem Formulation 次元削減 画像
付加情報 ラベル 従来: と のみを用いる 提案:付加情報 も用いる
5.
3. LFDA with
Side Information 従来手法 LFDA(Local Fisher discriminant Analysis) 判別分析:クラス内分散小+クラス間分散大 相関行列によって,データの局所構造をみる クラス1 クラス1 距離は同じ? 距離小のはず 距離大のはず
6.
相関行列あり→LFDA 従来手法LFDA クラス間分散→大 クラス内分散→小 cn n :クラスc内のデータ数 :全データ数 いつもの判別分析の式の書き直し + + - クラス1 クラス2 bS wS
7.
相関行列 jiA, 従来: で決めていた(局所の密度を考慮) 提案:付加情報
で決める ・付加情報は相関行列を通じて次元削減に影響する ・次元削減する際 は不要 にはノイズが多い )exp( x x 大→ 大 jiA, 小→ 小jiA, クラス1 クラス1
8.
1,Users information リピンされたユーザには1を 2,Boards information リピンされたボードには1を 3,Clusters
information Boardsをクラスタリング. 所属するクラスタには1を 5. Experimental results ・他手法に勝る ・clusters informationを用いたときが最も良い 付加情報(1枚の画像に対して) 4. Pinterest Dataset
9.
参考文献[3]
10.
参考文献[3]
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