顯著物件與尺度不變特徵轉換特徵包比對之影像搜尋研究

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林政威(Cheng-Wei Lin) 查詢紙本館藏

畢業系所

資訊管理學系

論文名稱

顯著物件與尺度不變特徵轉換特徵包比對之影像搜尋研究
(The Study of Salient Object and BOF with SIFT for Image Retrieval)

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摘要(中)

有效地檢索數位影像，已成為影像檢索領域的重要研究。1990年，基於內容之影像檢索主要為擷取影像低階特徵；但是低階視覺特徵和高階語意概念之間仍存在著語意差距。本研究提出以尺度不變特徵轉換(Scale Invariant Feature Transform, SIFT)之特徵包(Bag of Features, BOF)模型結合影像之顯著物件概念的影像檢索系統，以物件圖像作為查詢影像標的之影像搜尋，透過影像含有的物件進行搜尋，並實作出影像搜尋系統。
本研究透過顯著物件偵測技術辨識出影像的顯著物件，並降低背景雜訊對物件的影響。經過顯著物件偵測處理過的影像，使用SIFT擷取影像特徵，再透過K均數分群演算法對所有影像特徵向量分群，得到影像之BOF向量；另外物件圖像亦運用SIFT擷取影像特徵，再透過從資料集影像計算得到之編碼簿，統計物件圖像SIFT特徵在各視覺詞彙中的數量，得到物件圖像之BOF向量。
本研究從MSRA-A影像資料集整理出十個類型，共一千張影像進行實驗。實驗一：發現顯著物件偵測以矩形顯著影像表現較好；實驗二：探討編碼簿大小為何能影響影像搜尋準確率，實驗發現分群數目為200時，影像搜尋效果較佳；實驗三：探討物件圖像是否可以達到影像搜尋之應用，實驗結果發現以物件概念搜尋目標影像，確實可達到以物件搜尋影像之目的。從敏感度分析得知，透過變形功能提供更多樣的物件圖像，可以達到較精確的影像搜尋結果。
研究結果證實使用物件概念搜尋影像；並結合顯著物件與BOF與SIFT，確實比過去研究未結合顯著物件偵測之方法，較能夠提高影像搜尋準確率；最後，透過改良之系統搜尋方式與改善之影像搜尋準確率，實作出影像搜尋系統。

摘要(英)

To effectively search digital images has become increasingly important in image retrieval (IR) area. In 1990’s, content-based image retrieval indexes images by their low-level features, but there are existing semantic gaps between low-level features and high-level semantic concepts. The study proposes an image retrieval system based on bag-of-features (BOF) with scale invariant feature transform (SIFT) combined salient object, to search through the objects contained in the image and to implement the real image retrieval system.
This research detects a salient object in the image through salient object detection, and reduces the influence of background noise. After using salient object detection, SIFT features are extracted from each salient image in image database, and clustered using K-means clustering algorithm to form the codebook. SIFT features are extracted from object image, and found the nearest cluster center of the visual vector in codebook, and then the SIFT features of image are quantified using this visual vocabulary. Finally, an object image is presented as a set of visual words.
In the experiments, image database is subset of image dataset MSRA-A. It contained 1000 images, which were equally divided into 10 different categories. The 1st experimental results showed that rectangle salient images perform better than original salient images in terms of salient object detection. The 2nd experiment studying the influence of the codebook size on retrieval performance of the system showed that the best size is 200 for this data set. The 3rd experimental results showed that using object concept is useful to find similar images that contain objects. From sensitivity analysis, providing a variety of query images through the transformation of object image can achieve better performance in image retrieval.
In conclusion object images can improve the accuracy of image retrieval based on BOF with SIFT combined salient object. Eventually, the study is to implement an image retrieval system by changing the query method and improving the precision in image retrieval.

關鍵字(中)

★ 影像檢索
★ 基於內容之影像檢索
★ 尺度不變特徵轉換
★ 特徵包
★ K均數分群演算法

關鍵字(英)

★ Image retrieval
★ Content-Based Image Retrieval
★ Scale Invariant Feature Transform
★ Bag of Features
★ K-means clustering algorithm

論文目次

摘要 i
Abstract ii
誌謝 iii
目錄 iv
圖目錄 vii
表目錄 ix
第一章、緒論 1
1-1、研究背景 1
1-2、研究動機 1
1-3、研究目的 2
1-4、研究貢獻 3
第二章、文獻探討 4
2-1、基於內容之影像檢索 4
2-1-1、特徵包模型 5
2-1-2、尺度不變特徵轉換 6
2-2、視覺注意 9
2-2-1、顯著物件偵測 10
第三章、系統開發 14
3-1、系統架構 14
3-1-1、偵測顯著物件 14
3-1-2、特徵包轉換 15
3-1-3、相似度衡量 17
3-2、系統實作與功能 18
3-2-1、系統功能 18
第四章、實驗設計與結果 21
4-1、實驗環境 21
4-1-1、資料集 21
4-1-2、物件圖像 21
4-1-3、效能評估方法 22
4-2、實驗設計 23
4-2-1、顯著物件裁切方式 23
4-2-2、編碼簿大小 24
4-2-3、結合顯著物件與尺度不變特徵轉換特徵包之效能 24
4-2-4、影像搜尋準確率 25
4-3、實驗結果分析 25
4-3-1、顯著物件裁切方式分析 26
4-3-2、編碼簿大小分析 26
4-3-3、結合顯著物件與尺度不變特徵轉換特徵包之效能分析 28
4-3-4、影像搜尋準確率分析 28
4-4、敏感度分析 31
4-4-1、分析結果 32
4-5、小結 36
第五章、結論與未來研究方向 40
5-1、結論 40
5-2、研究限制與未來方向 42
參考文獻 44
附錄一：中英對照表 47
附錄二：系統程式碼 50

參考文獻

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指導教授

薛義誠(Yih-Chearng Shiue)

審核日期

2015-7-15

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