政大機構典藏-National Chengchi University Institutional Repository(NCCUR):Item 140.119/134204

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Title:	基於深度學習框架之夜晚霧霾圖像模擬與復原方法評估 Nighttime Haze Images Simulation and Restoration Using Deep Learning Frameworks
Authors:	鄭可昕 Cheng, Ko-Hsin
Contributors:	廖文宏 Liao, Wen-Hung 鄭可昕 Cheng, Ko-Hsin
Keywords:	深度學習夜晚圖像霧霾模擬圖像去霧圖像復原 Deep learning Nighttime images Fog simulation Haze removal Image restoration
Date:	2021
Issue Date:	2021-03-02 14:57:22 (UTC+8)
Abstract:	近年來氣候異常、空氣污染問題日漸嚴重，使得日常中發生霧霾現象的次數越來越多，在霧霾環境中拍攝的圖像，會使得圖像的清晰度與對比度大幅降低，當霧霾現象發生在夜晚，伴隨燈光的干擾，其圖像品質更差。隨著深度學習在圖像領域研究成果的突破，如何將深度學習方法應用於霧霾圖像的復原與去霧，逐漸成為研究者感興趣的主題之一。本研究以霧霾圖像形成原理與圖像深度為概念，結合生成對抗網路、大氣散射模型與圖像深度估計等方法，在清晰的夜晚圖像上，疊加霧霾效果，模擬出夜晚霧霾圖像，並透過深度學習方法，將模擬的圖像作為訓練資料，訓練一組模型能夠應用在復原模擬的夜晚霧霾圖像。為了對模型進一步評估與分析，本研究亦使用真實夜晚霧霾圖像做測試，檢驗模型的泛化能力。此外，為能更客觀地確認去霧成效，我們計算並比較復原前與復原後圖像之圖像品質指標，以及使用YOLOv5目標偵測方法，以所得之mAP作為衡量基準，均可觀察到處理前後的明顯差異。 In recent years, extreme weather and air pollution problems have become serious, causing the frequent formation of haze in our daily life. Images taken in a haze environment will significantly lose sharpness and contrast. When haze occurs at nighttime, the image quality worsens due to the interference of light. With the rapid progress of deep learning in the field of computer vision, applying deep neural networks to the restoration of images degraded by haze has become one of the topics of interest to researchers. This research employs the concept of fog and haze image formation and image depth, in combination with generative adversarial network, atmospheric scattering model, and image depth estimation, to simulate nighttime haze images by superimposing the haze on clear nighttime images. Based on deep learning methods, the simulated images are used as training data to build a model that can successfully restore the simulated nighttime haze images. To evaluate the effectiveness of the proposed approach, we also use real nighttime haze images to observe the generalization ability of the model. To examine the effect of dehazing in an objective manner, several image quality indices have been computed and compared. Additionally, the YOLOv5 object detection method has been utilized to calculate the mAP of the detection before and after restoration. All results indicate improved performance after image dehazing.
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Description:	碩士國立政治大學資訊科學系碩士在職專班 107971017
Source URI:	http://thesis.lib.nccu.edu.tw/record/#G0107971017
Data Type:	thesis
DOI:	10.6814/NCCU202100281
Appears in Collections:	[Executive Master Program of Computer Science of NCCU] Theses

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