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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/65860| Title: | 監視攝影機的失焦偵測 Out-of-focus Detection on Surveillance Camera |
| Authors: | Cheng-Wei Hsu 許承偉 |
| Advisor: | 傅楸善 |
| Keyword: | 監視攝影機,焦點特徵值,DM368, surveillance camera,focus value,DM368, |
| Publication Year : | 2012 |
| Degree: | 碩士 |
| Abstract: | 本論文提出一個應用在TI DM368系統上的監視攝影機對於當前影像是否在適當的焦距上的方法。現今許多攝影機都有自動對焦的功能,可以利用硬體的協助達成主動自動對焦,或者在軟體影像處理的部分計算焦點特徵值,配合搜尋演算法來達成被動自動對焦,這些方法通常需要馬達來調整鏡頭的焦距來達成自動對焦的目的。而本論文所提供的方法,是希望不使用搜尋演算法去比對前後焦點特徵值,而是藉由當前影像焦點特徵值間的相對關係,來達成判定當前影像是否在適當焦距上的功能。 Nowadays most of surveillance cameras have autofocus functionality. It can be classified into two types of methods: active autofocus with auxiliary hardware device and passive autofocus with image processing by calculating focus value and searching algorithm. Both of these methods need a motor on camera to control the focal length. In this thesis, we propose a new method applying to TI DM368 to detect out-of-focus situation without searching algorithm but only using some mathematical features on focus values. |
| URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/65860 |
| Fulltext Rights: | 有償授權 |
| Appears in Collections: | 資訊工程學系 |
Files in This Item:
| File | Size | Format | |
|---|---|---|---|
| ntu-101-1.pdf Restricted Access | 3.59 MB | Adobe PDF |
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