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นายธเนศ เกษศลป์ รหั�ส 51312306

ภาควิชานติวิทยาศาสติร�คณะวิทยาศาสติร� มหัาวิทยาล�ยศลป์ากร

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Reconstructing shredded documents through feature

matching

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Introduction

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4

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1. Introduction

2.presents an overview of the proposed methodology.

4.shows how we compute the similarity between the polygons as well as the global search algorithm. Finally

3.describes the feature set we have used to carry out the local matching.

5. reports the experimental results and Section

6. present some perspectives of future works and concludes this work.

Different kinds of shredding.

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The block diagram of the proposed methodology

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Inner and outer boundaries produced by shredding

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Inner and outer boundaries produced by shredding.

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Angle features extracted from the polygon.

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Description of the feature vector

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Similarity between angles.

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Distance features extracted from the polygon.

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Best matching (a) fragments i and j and (b) new fragment Fij

where three vertices were removed.

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Steps of the document reconstruction.

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Examples of the documents in the database.

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Examples of a document totally reconstructed: (a) fragments and (b) document reconstructed.

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Performance of the proposed methodology in reconstructing

documents shredded by hand.

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3–16 fragments

1 cm x 1 cm to 5 cm x 5 cm

สวิ�สดี� 20