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        <identifier>oai:ipsj.ixsq.nii.ac.jp:00174412</identifier>
        <datestamp>2025-01-20T06:41:30Z</datestamp>
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          <dc:title>P2-invariant を用いた文書画像検索</dc:title>
          <dc:title>Document image retrieval using P2-invariant</dc:title>
          <dc:creator>大西, 友貴</dc:creator>
          <dc:creator>小山田, 雄仁</dc:creator>
          <dc:creator>三柴, 数</dc:creator>
          <dc:creator>近藤, 克哉</dc:creator>
          <dc:creator>Tomotaka, Ohnishi</dc:creator>
          <dc:creator>Yuji, Oyamada</dc:creator>
          <dc:creator>Kazu, Mishiba</dc:creator>
          <dc:creator>Katsuya, Kondo</dc:creator>
          <dc:description>文書画像検索とはカメラで撮影した文書画像を事前に用意したデータベース中から見つける手法を指す．従来法では，射影不変だが点の順列に対して暖昧性を持つ特徴量を用いていた．そのため順列に対し暖昧性を解決する工夫が行われてきたが，特徴量に冗長性を持たせるため本質的な解決策とは言えなかった．本論文では射影不変かつ置換不変な特徴量を用いることで，冗長性を解消した文書画像検索を提案する．実験では，シミュレーション・実画像実験を行い，本手法の性能を検証した．</dc:description>
          <dc:description>Given an image capturing a document, document image retrieval finds the closest image from a document image database. Typical solutions regard each word as a point and solve the retrieval as points-to-points matching. Locally Likely Arrangement Hashing (LLAH) uses affine/perspective invariants as feature and achieves real-time retrieval system based on hashing. LLAH contains a redundancy to solve the permutation ambiguity of points detected from an image. In this paper, we propose to introduce P2-invariant, perspective and permutation invariant, as feature for document image retrieval. Contrast to the existing methods, the proposed method solves the retrieval problem by 5-tuple-to-5-tuple matching technique. The experimental result shows the performance of the proposed method.</dc:description>
          <dc:description>technical report</dc:description>
          <dc:publisher>情報処理学会</dc:publisher>
          <dc:date>2016-08-29</dc:date>
          <dc:format>application/pdf</dc:format>
          <dc:identifier>研究報告コンピュータビジョンとイメージメディア（CVIM）</dc:identifier>
          <dc:identifier>3</dc:identifier>
          <dc:identifier>2016-CVIM-203</dc:identifier>
          <dc:identifier>1</dc:identifier>
          <dc:identifier>6</dc:identifier>
          <dc:identifier>2188-8701</dc:identifier>
          <dc:identifier>AA11131797</dc:identifier>
          <dc:identifier>https://ipsj.ixsq.nii.ac.jp/record/174412/files/IPSJ-CVIM16203003.pdf</dc:identifier>
          <dc:language>jpn</dc:language>
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