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研究生: 林昆賢
Lin, Kun-Hsien
論文名稱: 汽車再辨識系統
Vehicle Re-identification
指導教授: 陳世旺
Chen, Sei-Wang
學位類別: 碩士
Master
系所名稱: 資訊工程學系
Department of Computer Science and Information Engineering
論文出版年: 2015
畢業學年度: 103
語文別: 中文
論文頁數: 74
中文關鍵詞: 車輛再辨識車輛偵測車輛追蹤車輛匹配平均旅行時間估計
英文關鍵詞: Vehicle re-identification(VRI), vision based, vehicle matching, traffic parameter estimation
論文種類: 學術論文
相關次數: 點閱:158下載:6
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  • 根據統計資料顯示,目前全世界汽車約有七億輛左右,按全世界人口平均約九人就有一輛汽車。隨著汽車的普及化,各國交通運輸相關單位也開始注重交通資訊方面的蒐集及提供。本研究發展汽車的再辨識技術,此技術可以提供許多應用。在短程應用方面,可以從事車輛大範圍的追蹤,協助治安偵防、交流量監控以及號誌控制等;而在長程應用方面,可以蒐集路段的交通參數,如旅行時間、路佔率、交流量以及平均車流速度等,提供給運輸業者或是交通局做長期的規劃及決策所使用。
    本研究提出用影像來從事汽車的再辨識。而使用影像有以下好處:硬體架設方便,只需要架設路口監視器即可,並且影像可以提供非常多額外的資訊,像是車輛顏色、車輛長度或是車輛型號等。此系統軟體部份由二大步驟所組成,分別是車輛偵測及車輛匹配。
    在車輛偵測的部份是採用建立高斯混合背景模型(Gaussian Mixture Background Model)找出畫面上的前景物。再利用隨機決策森林(Random Forest)有效的將前景物進行分類,主要分成三個類別,分別為小型車(包含轎車和箱型車等)、大型車(包含公車及卡車)以及非汽車類。接著利用粒子群聚最佳化(Particle Swarm Optimization)做車輛的追蹤,目的是要確保系統不會將相同車輛重覆儲存。接著利用Time Window的限制,從上游資料庫中找出可能與下游車輛相似的候選車輛,最後透過二分圖匹配(Bipartite Matching),將下游車輛與上游的候選車輛做匹配,即可辨識出哪些車輛通過上/下游。最後統計有通過上/下游的車輛,計算這些車輛配對的相對應關係,得到此路段的交通參數。

    This paper proposed a vision-based vehicle re-identfication (VRI) system. The objective of this system is automatically get the road traffic parameters. In the short term, the proposed system can track vehicle under wide range of area, investigate and prevent security, and control traffic signal; in the long term, the proposed system can collect road traffic parameters, e.g, travel time, road accounting rate, traffic flow and average speed.
    Using gaussian mixture background model (GMBM) to get foreground and classify foreground into three groups: small car, large car and non-car by random forest (RF). Tracking vehicle using particle swarm optimization to avoid store the same vehicle in the database again. Then regarding the vehicle matching as bipartite matching, and combining time window constrant to reduce matching time. Based on matching pairs, the traffic parameters are computed. The results show that this method can perform well under different time, weather and road type.

    第一章 簡介 1 1.1、研究背景 1 1.2、文獻探討 4 1.2.1、汽車再辨識 4 1.2.2、車輛偵測 5 1.2.3、車輛追蹤 8 1.2.4、車輛的匹配 9 1.3、論文架構 9 第二章 系統架構和流程 10 2.1、系統設置 10 2.2、系統運作 13 2.2.1、車輛偵測 13 2.2.1、車輛匹配 14 第三章 汽車偵測 16 3.1、建立背景模型 17 3.1.1、高斯背景模型更新 17 3.2、前景物偵測 19 3.3、汽車偵測 19 3.3.1、隨機決策森林 20 3.3.2、汽車追蹤 25 第四章 汽車匹配 31 4.1、Time Window的選擇 32 4.2、汽車匹配 34 第五章 實驗結果 41 5.1 隨機決策森林 42 5.2 汽車偵測 43 5.2.1 快速道路 44 5.2.2 市區道路 49 5.3 汽車再辨識 56 5.3.1 快速道路 57 第六章 結論及未來方向 67 6.1 結論 67 6.2 未來方向 68 參考文獻 69

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