影像式輝度量測儀之特性量測與校正;Characterization and Calibration of Imaging Luminance Measurement Devices

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/80631

Title:	影像式輝度量測儀之特性量測與校正;Characterization and Calibration of Imaging Luminance Measurement Devices
Authors:	沈於成;Shen, Yu-Chen
Contributors:	光電科學與工程學系
Keywords:	影像式輝度;Imaging Luminance Measurement Devices
Date:	2019-08-22
Issue Date:	2019-09-03 14:48:54 (UTC+8)
Publisher:	國立中央大學
Abstract:	在拍攝光源時，相機之灰階(Grayscale)和輝度 (Luminance) 彼此之間的轉換關係，會因為離焦的問題而產生換算上的錯誤，針對此問題我們首先提出一套校正流程。探討方法為先利用單一具銳利邊界之光源拍攝不同離焦距離的圖片，並利用擬合曲線分析邊界變化，找出特性參數之關係趨勢，達到可以預測當光源模糊時的位置。接著分析當清楚成像之銳利邊界光源被具有銳利邊界之光源模糊影響時，藉由找出兩個邊界特性將兩個光源進行分開之動作，達到清楚成像之光源的輝度得以恢復正常，為了要驗證在真實情況下究竟是否能夠使用，因此進行實景拍攝並與之前結果進行驗證。 ;When taking a picture of a light source, the conversion relationship between the grayscale and the luminance of the camera will be interfered by those defocused light sources. To solve the de-focusing problem, we develop a novel calibration process. By exploring the dependence of the blurred edges of an object-image boundary upon the imaging distance, the distance of the projecting light source can be determined in calibrated imaging system. Then the measuring luminance of the light sources within the focusing range can be refined by removing the contaminated signals from the defocusing light sources. The calibration process has also been verified in practical measurements and analysis.
Appears in Collections:	[Graduate Institute of Optics and Photonics] Electronic Thesis & Dissertation

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