多重曝光影像與多重焦距之影像拍攝與合成技術

在目前多媒體技術發達加上網路傳輸的普及化，越來越多人開始追求照片的效果與美感，一般的普通生活照片已經無法滿足使用者需求，因此越來越多消費性電子產品，如相機、手機、攝影機與平板等，利用計算攝影學來對影像進行後製合成。然而要拍攝一張好的照片是需要一些基本攝影知識，但並非所有使用者都具有攝影相關的知識，若要使用者根據不同場景，調整相機參數是相當不便利。例如使用者在拍攝生活場景中可能會想拍攝出主題清楚且背景模糊的專業照片，但一旦攝影技巧不夠熟悉很容易拍攝出失敗的照片，再加上生活中常常會遇到高反差的場景，如日出、日落等，僅拍攝單張影像很容易拍攝出過曝或者過暗的影像。因此本論文提出一套系統可以拍攝較少張數來提供重新對焦以及具有高動態範圍影像，此系統可以分成兩大部分，為前端智慧型拍攝以及後端影像合成。在前端智慧型拍攝中，會對場景進行人眼感興趣物體分析(ROI, Region of Interest)並配合相機本身的對焦系統來得到最佳的相機參數以及所需拍攝張數並判斷其動態範圍進行分析；而後端影像合成則是會將前端智慧型拍攝所得到的不同焦聚以及不同曝光時間的影像，經由亮度轉換後根據使用者的需求來合成出可以重新對焦以及具有高動態範圍的影像。最後影像品質量測分為主觀和客觀兩部分，從主觀的來看本論文所合成的高動態範圍影像皆可看出亮部及暗部細節；然而客觀品質量測結果也顯示出本系統使用較少張的影像進行合成，影像品質不會輸給使用大量張數進行的合成結果。本論文提供一套低消耗、方便以及高品質的系統，並且使用者不需要有太多攝影專業知識即可拍攝出理想照片。關鍵詞：高動態範圍影像、多重聚焦影像、曝光參數、影像合成

關鍵字

高動態範圍影像合成；多重聚焦影像合成；曝光參數；影像合成

並列摘要

Nowadays, the popularization of Internet transmission and well-developed multimedia technology result in people tend to pursue higher quality photos. The quality of photo depends on the camera parameters. Therefore, knowledge related to photography is required to take high quality photo. In this paper we propose a novel Multi-focus and High Dynamic Range Imaging (HDR) System. The system divided into two parts, Camera Capture System and Images Fusion System. According to the characteristics of the scene to be captured, the Capture System will analyze which objects are human eye interested, then decide the objects camera parameters and amount of photos; consequently, ensuring the dynamic range will cover the scene. Images fusion system will provide HDR of one in focus images and HDR of all clear images to satisfy the needs of users. Experimental results show that the proposed Multi-focus and High Dynamic Range Imaging System is capable of generating HDR images with fewer images than normal method. At the same time, the image’s quality is preserved. Keywords: HDR imaging, image capture, multi-focus fusion, exposure fusion.

並列關鍵字

HDR imaging ； image capture ； multi-focus fusion

參考文獻

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多重曝光影像與多重焦距之影像拍攝與合成技術

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