快速影像式自動對焦技術研究

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Title:	快速影像式自動對焦技術研究
Authors:	鄭芳炫 Cheng, Fang Hsuan
Contributors:	資訊工程學系 Computer Science & Information Engineering
Keywords:	鏡頭解像力;自動對焦;調制轉換方法;景深;清晰度;對比度 Lens Resolution;Auto Focus;Modulation Transfer Method;Depth of Field;Clarity;Contrast
Date:	2009
Issue Date:	2014-06-27 01:35:50 (UTC+8)
Abstract:	本論文提出一個快速影像式自動對焦演算法，主要是應用鏡頭架構特性，尋找出鏡頭景深(Depth of field)，再利用鏡頭解像力(Resolution)概念，以調制轉換方法(Modulation Transfer Method,MTF)做為影像清晰度演算法。經由粗略搜尋，算出影像對比度(Contrast)和銳利度(Sharpness)數值，利用焦距搜尋法，尋找出鏡頭的景深範圍，再由細部搜尋景深範圍內的清晰度數值，進而找出鏡頭成像最清楚的對焦點位置。以調制轉換方法做清晰度演算法可以避免以影像差異值和影像梯度 The paper proposes a fast image based auto focus technique. By applying the lens‟ architecture, depth of field can be estimated by computing the image clarity based on modulation transfer method. Based on coarse to fine strategy, we first compute the imag
Appears in Collections:	[Department of Computer Science and Information Engineering] Journal Articles

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