title: Wavelength-adaptive dehazing using histogram merging-based classification for UAV images.
abstract: Since incoming light to an unmanned aerial vehicle (UAV) platform can be scattered by haze and dust in the atmosphere, the acquired image loses the original color and brightness of the subject. Enhancement of hazy images is an important task in improving the visibility of various UAV images. This paper presents a spatially-adaptive dehazing algorithm that merges color histograms with consideration of the wavelength-dependent atmospheric turbidity. Based on the wavelength-adaptive hazy image acquisition model, the proposed dehazing algorithm consists of three steps: (i) image segmentation based on geometric classes; (ii) generation of the context-adaptive transmission map; and (iii) intensity transformation for enhancing a hazy UAV image. The major contribution of the research is a novel hazy UAV image degradation model by considering the wavelength of light sources. In addition, the proposed transmission map provides a theoretical basis to differentiate visually important regions from others based on the turbidity and merged classification results.
authors: Department of Image, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 156-756, Korea. inhyey@gmail.com.
authors: Inhye
authors: I
authors: Yoon
authors: Department of Image, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 156-756, Korea. sukhwa88@gmail.com.
authors: Seokhwa
authors: S
authors: Jeong
authors: Department of Satellite Data Cal/Val Team, Korea Aerospace Research Institute, 115 Gwahangbo,Yusung-Gu, Daejon 305-806, Korea. jjh583@kari.re.kr.
authors: Jaeheon
authors: J
authors: Jeong
authors: Department of Satellite Data Cal/Val Team, Korea Aerospace Research Institute, 115 Gwahangbo,Yusung-Gu, Daejon 305-806, Korea. dcivil@kari.re.kr.
authors: Doochun
authors: D
authors: Seo
authors: Department of Image, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 156-756, Korea. paikj@cau.ac.kr.
authors: Joonki
authors: J
authors: Paik