手機閃光燈之廣角補光燈之光學設計與影像處理

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姓名

陳柏源(Po-Yuan Chen) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

手機閃光燈之廣角補光燈之光學設計與影像處理
(Optical Design and Image Processing of Wide-Angle Fill Light for Mobile Phone Flash)

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至系統瀏覽論文 (2027-6-26以後開放)

摘要(中)

本研究旨在為 iPhone 12 的閃光燈設計一款廣角補光燈，以提升拍攝照片的照明品質。透過光學設計，補光燈可提供更寬廣且均勻的光線分布，有效解決閃光燈照明範圍不足的問題。此外，本研究提出了一種影像處理方法，利用已知的照度分布，在相同拍攝條件下，透過簡單的運算即可獲得亮度均勻的照片。實驗結果顯示加入本論文所設計之廣角補光燈後，照片的灰階變化、亮度均勻性、訊雜比等影像品質指標均優於單獨使用閃光燈的情況，驗證了補光燈設計的有效性。

摘要(英)

Despite the increasingly powerful camera functions of modern smartphones, their built-in flashes still have limitations in lighting performance. Firstly, the illumination range of smartphone flashes is limited, often failing to cover the needs of wide-angle photography, resulting in insufficient brightness at the edges of the frame. Secondly, due to the concentrated light source, objects illuminated by the flash are prone to overexposure in the center and darkening at the edges, affecting the overall luminance uniformity of the photo.
To address these issues, this study focuses on developing a wide-angle auxiliary flash for the iPhone 12. Through optical design, we aim to expand the illumination range and provide a more uniform light distribution, thereby enhancing the image quality of mobile photography in low-light environments. Additionally, we will explore how to further correct the uneven illumination caused by the flash through image processing techniques, aiming to achieve more desirable photography results.

關鍵字(中)

★ 手機閃光燈
★ 補光燈
★ 光學設計
★ 影像處理

關鍵字(英)

★ Mobile Flashlight
★ Fill Light
★ Optical Design
★ Image Processing

論文目次

摘要 V
ABSTRACT VI
致謝 VII
目錄 VIII
圖目錄 XI
表目錄 XVII
第一章緒論 1
1-1 前言 1
1-2 研究動機 3
1-3 論文大綱 4
第二章基礎原理 5
2-1 光度學 5
2-2 LED基本介紹 9
2-3 中場擬合法 12
2-4 幾何光學原理 14
2-4-1 折射定律 14
2-4-2 全內反射 15
2-4-3 反射定律 17
第三章補光燈設計及結果分析 18
3-1 光源量測及模型建立 18
3-2 折射式透鏡之二次光學設計 24
3-2-1 初步設計-De0402 25
3-2-2 最終設計-De0507 28
3-3 設計結果分析 31
3-4 補光燈模型製作與驗證 33
3-5 均勻度分析 40
第四章影像處理及分析 44
4-1 相機原始資訊 45
4-1-1 影像感光元件與拜爾陣列 46
4-1-2 歸一化處理 49
4-1-3 白平衡校正 50
4-1-4 去馬賽克化 51
4-1-5 結論 53
4-2 影像處理 54
4-3 影像品質分析 57
4-3-1 訊雜比 57
4-3-2 條紋圖形拍攝 58
4-3-3 戶外場景拍攝 63
第五章結論 70
參考文獻 72
中英文名詞對照表 75
附錄A 80

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指導教授

孫慶成(Ching-Cherng Sun)

審核日期

2024-8-13

推文