「霧」や「もや」などをクリアにする高速画像処理技術

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1 Fas Single-Image Defogging 谭志明白向晖王炳融東明浩あらまし CPU GPU fps Absrac Bad weaher condiions such as fog, haze, and dus ofen reduce he performance of oudoor cameras. In order o improve he visibiliy of surveillance and on-vehicle cameras, we propose a fas image-defogging mehod based on a dark channel prior. I firs esimaes he amospheric ligh by searching he sky area in he foggy image. Then i esimaes he ransmission map by refining a coarse map from a fine map. Finally, i produces a clear image from he foggy image by using he amospheric ligh and he ransmission map. We achieved a run speed of , wih a sofware implemenaion on a cenral processing uni (CPU) wih a graphics processing uni (GPU). This fas image-defogging mehod can be used in surveillance and driving sysems in real ime. FUJITSU. 64, 5, p ,

2 まえがき 2.5 m PM 従来技術画像霧除去モデル x I J x x 1 A x x I xj x x A J x x A 1 x 図 -1 x I x A x J x I x I xa J x x e d x d x 霧除去の方法 Tan 7 Faal FUJITSU. 64, 5 09, 2013

3 霧画像 I x 明画像 J x x A I xj xxa 1x x 画 I xax を J x を画に霧をする -1 Kraz 9 He 10 Tarel 11 x I He 3.0 GHz Inel Penium 4 PC ダークチャネル処理 He I dark x min c {r,g,b} min y x I y c I c I x x He 開発アルゴリズム概要 I dark x J dark x x A 1 c x I dark x J dark xa c 0 I dark x A 1 c x x 1 I dark x /A c x 0 A FUJITSU. 64, 5 09,

4 図 -2 I x AA I x x 環境光の推定 A I dark x 0.1 I x 図 -3 透過マップの推定 x 図 -4 x M coarse x min c {r,g,b} min y x I y c R G B x 図 R G B M fine x min c {r,g,b} I x c I x J x FUJITSU. 64, 5 09, 2013

5 霧画像 CPU リ GPU リ明画像を画像 CPU GPU -6 a b c d -7 x x x M x min max y x M coarse ym fine x x x 1M x /A 画像の復元 x J I x A /max x 0 A 0 0 実装 x GPUCPU GPU GPU GPU CPU GPU 図 GHz Inel i5 CPU NVIDIA GeForce 310M GPUPC fps 図 -7bd むすび FUJITSU. 64, 5 09,

100 参考文献 1 Y. Y. Schechner e al. Insan Dehazing of Images Using Polarizaion Compuer Vision and Paern Recogniion, Proceeding of he 2001 IEEE Compuer Sociey Conference Vol.1 p.325-332 2001 2 S.

Deep Phoo Model-Based Phoograph Enhancemen and Viewing SIGGRAPH Asia 2008 4 S. G. Narasimhan e al.

Chromaic Framework for Vision in Bad Weaher Compuer Vision and Paern Recogniion, Proceeding of he 2000 IEEE Conference Vol.1 p.598-605 2000 6 S. G. Narasimhan e al.

Tan Visibiliy in Bad Weaher from a Single Image Compuer Vision and Paern Recogniion Proceeding of he 2008 IEEE Conference p.1-8 2008 8 R. Faal Single Image Dehazing. Proceeding of SIGGRAPH 2008 p.

6 100 参考文献 1 Y. Y. Schechner e al. Insan Dehazing of Images Using Polarizaion Compuer Vision and Paern Recogniion, Proceeding of he 2001 IEEE Compuer Sociey Conference Vol.1 p S. Shwarz e al. Blind Haze Separaion Compuer Vision and Paern Recogniion, Proceeding of he 2006 IEEE Compuer Sociey Conference Vol.2 p J. Kopf e al. Deep Phoo Model-Based Phoograph Enhancemen and Viewing SIGGRAPH Asia S. G. Narasimhan e al. Ineracive De Weahering of an Image Using Physical Models Workshop on Color and Phoomeric Mehods in Compuer Vision S. G. Narasimhan e al. Chromaic Framework for Vision in Bad Weaher Compuer Vision and Paern Recogniion, Proceeding of he 2000 IEEE Conference Vol.1 p S. G. Narasimhan e al. Conras Resoraion of Weaher Degraded Images The IEEE Transacions on Paern Analysis and Machine Inelligence Vol.25 No.6 p R. Tan Visibiliy in Bad Weaher from a Single Image Compuer Vision and Paern Recogniion Proceeding of he 2008 IEEE Conference p R. Faal Single Image Dehazing. Proceeding of SIGGRAPH 2008 p L. Kraz e al. Facorizing Scene Albedo and Deph from a Single Foggy Image Compuer Vision, Proceeding of he 2009 IEEE 12h Inernaional Conference p K. He e al. Single Image Haze Removal Using Dark Channel Prior Compuer Vision and Paern Recogniion Proceeding of he 2009 IEEE Conference p J. P. Tarel e al. Fas Visibiliy Resoraion from a Single Color or Gray LevelIimage Compuer Vision, Proceedings of he 12h IEEE Inernaional Conference p X. Lv e al. Real-ime Dehazing for Image and Video 18h Pacific Conference on Compuer Graphics and Applicaions p K. He e al. Guided Image Filering Compuer Vision, Proceedings of he 11h European conference p 著者紹介谭志明 (Tan Zhiming) 王炳融 (Wang Bingrong) 白向晖 (Bai Xianghui) 東明浩 ( ひがしあきひろ ) 528 FUJITSU. 64, 5 09, 2013

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