基於HEVC畫面內編碼特徵之 影像內容檢索技術

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徐歆茹(Hsin-Ju Hsu) 查詢紙本館藏

畢業系所

通訊工程學系

論文名稱

基於HEVC畫面內編碼特徵之影像內容檢索技術
(Content Based Image Retrieval Utilizing HEVC Intra Coding Features)

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摘要(中)

隨著網路的蓬勃發展以及行動裝置的進步，使用者隨手可得影音資訊，這些多媒體資訊不斷地朝向高品質、高解析度發展，使得影音資料量成指數型成長，因此如何管理龐大的資料庫，並根據使用者的需求取得所需之影像便是一個重要的課題。基於影像內容之檢索技術，雖然發展歷史悠久且被廣泛的討論與研究，但多數的研究皆在原始像素域擷取特徵，必須將影像完全解壓縮後再進行處理，會增加許多計算複雜度以及儲存特徵空間。
本論文針對最新一代視訊壓縮標準HEVC，提出HEVC壓縮域之影像檢索技術，利用HEVC解碼器部分解碼所得之畫面內編碼資訊進行影像檢索。相較於直接使用解碼資訊作直方圖來比對，我們研究HEVC畫面內編碼之特性，將預測模式(intra prediction mode)作濾波處理，並將原本五種不同尺寸的預測單位(Prediction Unit, PU)分為兩組，再搭配其殘餘值(residual)能量之分布，萃取出有效的影像特徵以利檢索。實驗結果顯示，所提出之方法可大幅減少影像特徵的儲存空間，加速系統處理效率，而檢索效能平均準確率(Mean Average Precision, MAP)值為0.247。

摘要(英)

With the rapid development of Internet and mobile devices, how to efficiently retrieve multimedia information from huge databases becomes an important issue. In the past decade, numerous algorithms were extensively studied for content based image retrieval. However, most existing works retrieve features in the pixel domain, which requires fully decoding images. It is time consuming and memory wasting to retrieve features in the pixel domain.
This thesis focuses on the content-based image retrieval in compression domain for the new standard, high efficiency video coding (HEVC). The features are extracted from partially decoded intra frames. Instead of directly taking histogram from the decoded information, the directions of intra mode are filtered and the sizes of prediction unit are grouped into two types. And the histogram of residual power is also adopted as a feature. The retrieval efficiency can greatly benefit by the proposed features.
The experimental results show that the proposed method can reduce the resource consumption and achieve a good retrieval performance, i.e. Mean Average Precision (MAP) 0.247 in Oxford 5K dataset.

關鍵字(中)

★ 壓縮域
★ 基於內容影像檢索
★ 畫面內預測
★ HEVC

關鍵字(英)

★ Compression domain
★ Content-based image retrieval
★ Intra prediction
★ HEVC

論文目次

摘要 I
Abstract II
致謝 III
目錄 IV
圖目錄 VI
表目錄 VII
第一章緒論 1
1.1　研究背景 1
1.2　研究動機與目的 2
1.3　論文架構 3
第二章　基於內容檢索之相關研究介紹 4
2.1　基於內容之影像檢索簡介 4
2.2　基於內容檢索特徵概述 4
2.2.1　基於色彩特徵之檢索技術 5
2.2.2　基於紋理特徵之檢索技術 6
2.2.3　基於形狀特徵之檢索技術 7
2.3 壓縮域特徵擷取之文獻 8
2.3.1 基於DCT係數為特徵之檢索技術 9
2.3.2　基於霍夫曼表為特徵之檢索技術 11
2.3.3　基於向量量化為特徵之檢索技術 12
2.3.4　基於H.264壓縮域之檢索技術 13
第三章　HEVC視訊編碼介紹 16
3.1　HEVC視訊壓縮標準介紹 16
3.2 HEVC編碼架構 17
3.2.1　編碼單位 (Coding Unit, CU) 18
3.2.2　預測單位 (Predition Unit, PU) 19
3.2.3　轉換單位 (Transform Unit, TU) 20
3.3 畫面內預測 (Intra Prediction) 21
3.4 畫面內預測模式選擇 25
第四章提出之壓縮域檢索技術 28
4.1 利用預測模式建立區域直方圖之分析 28
4.1.1評比標準MAP 31
4.1.2 HEVC之PU尺寸分析 31
4.1.2 HEVC預測模式之分析 34
4.2 以殘餘值構成之特徵向量 38
4.3 所提出之演算法架構 39
第五章實驗結果與分析討論 40
5.1　實驗參數與模擬環境 40
5.2 評分機制 42
5.2.1 MAP 42
5.2.2 ANMRR 44
5.3 提出之壓縮域內容檢索技術之結果與分析 45
5.4 HEVC解碼端複雜度分析與資料量評比 50
第六章　結論與未來展望 52
參考文獻 53

參考文獻

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指導教授

張寶基(Pao-Chi Chang)

審核日期

2014-7-31

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