高動態範圍影像式照度即時檢測系統;High-dynamic-range Imaging System for Real-time Detection of Illuminance

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/86009

Title:	高動態範圍影像式照度即時檢測系統;High-dynamic-range Imaging System for Real-time Detection of Illuminance
Authors:	蕭力瑋;Hsiao, Li-Wei
Contributors:	光電科學與工程學系
Keywords:	單眼數位相機;原始圖檔;影像處理;高動態範圍;近光燈;遠光燈;K-mark;E-mark;DSLR;Raw data;Image processing;HDR;Low beam;High beam;K-mark;E-mark
Date:	2021-08-25
Issue Date:	2021-12-07 11:51:55 (UTC+8)
Publisher:	國立中央大學
Abstract:	擁有優良設計的車頭燈不僅能夠為駕駛者提供良好的駕駛體驗，更能確保駕駛在夜間行車的安全。因此各國政府會建立一套有系統的法規去對車前燈進行規範。傳統的車前燈量測使用配光曲線儀逐點量測，藉以獲得全場域的光場分佈。本論文使用單眼數位相機拍攝後所生成的原始圖檔，經由影像處理以及整體系統響應補償後，讓我們可精準獲得量測面的照度值。並藉由不同的曝光時間來擴大系統量測的動態範圍。最後，判斷車前燈的是否通過德國法規(K-mark)或歐盟ECE R113 Class B 法規(E-mark)。由實驗結果可以得知，在低於2 lx的部份，我們的計算值與實際量測值誤差在0.1 lx以下，而在高於2 ?lx的部份，我們的計算值與實際量測值誤差小於 5 %。;A well-designed headlamp provides the automobile drivers with not only an excellent driving experience but also the high degree of safety for night driving. Therefore, all the governments in the world have established the systematic regulations for headlamps. Conventional time-consuming measurement on the light field distribution of headlamps utilizes the point scanning method in the goniophotometer. In this thesis, the raw codec file captured by a DSLR (digital single-lens reflex) camera on the screen illuminated by the headlamp is accurately converted into the illuminance distribution to greatly saving the measurement time. Several image processing and calibration procedures on system responses are executed in the study. Moreover, the dynamic range of the measurement is also expanded by tuning the exposure dime. Finally, the headlamp can be quickly evaluated for the K-mark regulation and/or E-mark regulation. The accuracy is less than 0.1 lx as the illuminance is lower than 2 lx, while less than 5 % as the illuminance is higher than 2lx.
Appears in Collections:	[Graduate Institute of Optics and Photonics] Electronic Thesis & Dissertation

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