bag-of-words bag-of-keypoints Web bagof-keypoints Nearest Neighbor SVM Nearest Neighbor SIFT Nearest Neighbor bag-of-keypoints Nearest Neighbor SVM 84
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1 Bag-of-Keypoints Web G.Csurka bag-of-keypoints Web Bag-of-keypoints SVM 5.% Web Image Classification with Bag-of-Keypoints Taichi joutou and Keiji yanai Recently, need for generic image recognition is getting larger due to the explosive increase of digital images. Then, we have performed classification expreiments for general images gathered from Web employing the bag-of-keypoints method proposed by G.Csurka et al. In the experiments, we have obtained the 5.% classification rate for object classes... World Wide Web Flickr ) Web Web Department of Computer Science, The University of Electro-Communications Corel Corel Image Gallery. G. Csurka bag-of-keypoints ) Web.3
2 bag-of-words bag-of-keypoints Web bagof-keypoints Nearest Neighbor SVM Nearest Neighbor SIFT Nearest Neighbor bag-of-keypoints Nearest Neighbor SVM 84% 5%. SIFT SIFT David Lowe 3) 4) SIFT Sivic, J. 5) 4) G. Csurka ) bag-of-keypoints SIFT Naive Bayes SVM 7 SIFT bag-of-keypoints Sivic, J. G. Csurka SIFT bag-of-keypoints 3. Web SIFT bag-of-keypoints ) ( ) k-means visual words Nearest Neighbor SVM Nearest Neighbor SIFT Nearest Neighbor bag-of-keypoints Nearest Neighbor SVM 5 bag-of-keypoints Web
3 (SIFT) SIFT(Scale Invariant Feature Transformation) 3) David Lowe SIFT DOG(Difference of Gaussian) 8 SIFT SIFT ( ) 8 (4 4 8) 3D SIFT C++ SIFT++ 6) pgm SIFT (8 ) SIFT++ C++ 4. Bag-of-keypoints Bag-of-keypoints ) visual words code book visual word (bag) Bag-of-keypoints ( ) ( ) codebook ( 3 ) codebook ( 4 ) 4.. Visual words visual word SIFT (4.. ) code book visual words( ) visual words visual words visual words 4... k-means kmeans k k code book k Code book code book (bag-of-keypoints) code book () ( 3) code book visual word code 3
4 book k k / SVM multiclass (Multi-Class Support Vector Machine) 7) M.J.Swain 8) I j j M j j S IM n S IM = min(i j, M j) j= (Nearest Neighbor) () 4.3. SVM(Support Vector Machine) SVM 9) 96 Vapnik Optimal Separating Hyperplane SVM SVM SVM light) SVM multiclass (Multi-Class support Vector Machine) 7) SVM Φ (Φ(x) Φ(x )) K(x, x ) linear radial basis function linear( ) y = sign(w T x h) radial basis function() K(x, x ) = exp( x x ) σ radial basis function SVM Radial Basis Function(RBF) ( ) Web ( ) ( ) ( ) 5 ) ( 4) 4
5 5 5 ) ( ) () () 5. ( 4) Nearest Neighbor bag-of-keypoints Nearest Neighbor 3 bag-of-keypoints SVM( linear) 4 bag-of-keypoints SVM( radial basis function) bag-of-keypoints code book fold cross validation 5 (( )/( )) (( )/( )) F- (F-measure) (confusion matrix) 5.3. F- (F-measure) F- (recall) (precision) () F = + recall precision 5.3. (confusion matrix) M ij M ij = {I k C j : h(i k ) = i} C j i, j {,..., N c}(n c ) C j j h(i k ) I k
6 図4 種類の画像のサンプル (左上から グ ローブ ) す 手法 では code book のサイズ別に表記した 次に 手法 の分類器を Nearest Neighbor から SVM に変えて分類実験した結果を表 5 と表 6 で示す SVM はカーネルを 通り試したため カーネル別に 分けてから code book サイズで分けて表記した また クラス別にそれぞれの手法の F-値を計算し たものを表 5 で示す ただし bag-of-keypoints を用 いた手法においては 結果がよかった code book サ イズの実験結果のみを示す 最後に 種類の F-値の平均が最も良かった カーネルに radial basis function を用いた bag-ofkeypoints+svm の手法 (手法 4) で code book サイ ズを 8 としたときの結果を混合行列にして表 7 で 示す 図 5 種類の F-値とその平均 5.4. 種類分類実験の結果 種類分類の結果より SVM を用いた手法におい てカーネルの違いによる大きな結果の違いがなかった ため 学習時間が圧倒的に短い線形 (linear) カーネル による SVM を 種類分類において採用する 種類分類の結果を 種類の平均再現率と平均 適合率を用いて表 8 で示す さらに F-値で評価した 結果の上位 種類と 下位 種類を表 9 で示す 結 果が特に良かったもの 悪かったものを図 6 で示す 表 3 カラー+NN と bag-of-keypoints+nn の再現率 平均 カラー ヒストグラム bag-of-keypoints(code book size(c)) 表8 種類の分類結果 平均再現率.5 平均適合率.489 表 4 カラー+NN と bag-of-keypoints+nn の適合率 平均 カラー ヒストグラム 表9 bag-of-keypoints(code book size(c)) 種類の F-値の TOP と WORST 自転車 ネックレス 阿波踊り 花火大会 スパゲッティ 温泉 剣道 ねぶた 石垣 スーツ 6 TOP 橋 港 神社 猫 相撲 アスパラガス 川 うなぎ トカゲ ツツジ WORST
7 表 5 bag-of-keypoints+svm での再現率 カーネル 平均 linear code book size radial basis function code book size 表 6 bag-of-keypoints+svm での適合率 カーネル 平均 linear code book size radial basis function code book size 表 7 手法 4(code book size=8) の混合行列 True class 図 6 左図が結果がよかった例 右図が結果が悪かった例 5.5 考 察 5.5. 種類の分類 まず 手法 と手法 の結果より カラーヒストグ ラムと SIFT 特徴 (bag-of-keypoints) の特徴量につい て考察してみる 表 3 表 4 を見ると 再現率 適合率 とも SIFT 特徴の方が 圧倒的に認識率が優れている 特に の画像は図 4 を見るとわかるように には 角や丸みを帯びたものなど他の種類にない物体 の形状の特徴を持っている 逆に 色の視点から見て みると 背景に建物や空が写っていて 色だけでは判 断しにくいことがわかる このことにより カラーヒ ストグラムより SIFT 特徴の方が特徴量として有効だ と示される 次に 手法 と手法 3 の結果より Nearest Neighbor と SVM の分類器について考察してみる 表 3 表 4 より 手法 の再現率と適合率の平均は.76 と.77 であり 手法 3 は表 5 表 6 より 線形カーネルを用 いた SVM のものは.76 と.73 で若干手法 の方 7
8 SVM F- ( 5) SVM bag-of-keypoints ( 8) 5% % Web 84% 5% Nearest Neighbor visual words bag-of-keypoints O.Maron ) Multiple Instance Learning(MIL) MIL () O.Maron Diverse Density MIL () Chen, Y. ) MIL Chen, Y. ) Flickr: ) Csurka, G., Bray, C., Dance, C. and Fan, L.: Visual categorization with bags of keypoints, Workshop on Statistical Learning in Computer Vision,European Conference on Computer Vision, pp. (4). 3) Lowe, D.: Distinctive Image Features from Scale-Invariant Keypoints, International Journal of Computer Vision, Vol.6, No., pp.9 (4). 4) Brown, M. and Lowe, D.: Recognising panoramas, Proc. The International Conference on Computer Vision, pp.8 5 (3). 5) Sivic, J. and Zisserman, A.: Video Google: A Text Retrieval Approach to Object Matching in Videos, Proceedings of the International Conference on Computer Vision, Vol., pp (3). 6) Vedaldi, A.: SIFT++, edu/ vedaldi/code/siftpp/siftpp.html. 7) Joachims, T.: SVM multiclass, cornell.edu/people/tj/svm light/svm multiclass. html. 8) M.J.Swain and D.H.Ballard: Color Indexing, International Journal of Computer Vision, Vol.7, No., pp. 3 (99). 9) (3). ) Joachims, T.: SVM light, cornell.edu/people/tj/svm light/index.html. ) Maron, O. and Ratan, A.: Multiple-instance learning for natural scene classification, The Fifteenth International Conference on Machine Learning, pp (998). ) Chen, Y., Bi, J. and Wang, J.: MILES: Multiple-Instance Learning via Embedded Instance Selection, IEEE Transaction on Pattern Analalysis and Machine Intelligence, Vol. 8, No., pp (6). 8
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