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  4. 中科院安徽光学精密机械研究所
Image quality analysis method under background radiation in turbid atmosphere

文献类型：期刊论文

作者Zheng Xin1,2; Wu Peng-Fei1; Rao Rui-Zhong1,2
刊名ACTA PHYSICA SINICA
出版日期2018-04-20
卷号67期号:8页码:10
关键词image quality analysis turbid medium modulation transfer function background radiation
ISSN号1000-3290
DOI10.7498/aps.67.20172625
通讯作者Wu Peng-Fei(wupengfei@aiofm.ac.cn)
英文摘要Image quality is seriously degraded when propagating through the turbid atmosphere. It is practical to characterize the degradation process in terms of modulation transfer function (MTF). The MTF can describe the effect of the turbid medium on imaging quantitatively in spatial frequency domain, including attenuation and multiple scattering. It is inherent property of the turbid medium. The whole spatial frequency characteristic of the turbid atmosphere MTF can be acquired through the equivalence principle, i, e., the equivalence between the MTF of a turbid medium and the transmitted radiance from the medium under isotropic diffuse illumination. In practice, the image quality is not only affected by the turbid medium MTF but also related tightly to the background radiation. The influence of scattered background radiation on imaging was almost not considered in the past when dealing with the imaging problem in the turbid atmosphere. In this paper, this issue is considered in detail. The analysis results demonstrate that the scattered background radiation increases the zero frequency component of image in spatial frequency domain. As a result, it degrades the image contrast seriously in spatial domain. Based on the optical model of image degradation in the atmosphere, the theoretical analysis is carried out to study the image quality degradation process in spatial frequency domain. The formalized MTF is proposed, which considers the effects of attenuation, multiple scattering and scattered background radiation by the turbid medium on image quality. The quantitative relation among the formalized MTF, turbid medium MTF and background radiation is confirmed. Image blur simulations show that the results from the formalized MTF are more consistent with actual scenes than results only from turbid medium MTF. Thus, the formalized MTF can describe the image degradation process through atmosphere comprehensively. The image restoration results indicate that the formalized MTF method performs better than dark channel prior method. In order to evaluate different image restoration methods effectively in spatial frequency domain, spectrum area (A(S)) is proposed. The A(S) is the area of middle-high frequency information of the region of interest in restored image. So A(S) can represent the scene details in the restored image. The higher the A(S), the better the image quality is, which is demonstrated in this paper. In conclusion, the formalized MTF provides a more effective method for image quality analysis and assessment. Additionally, it also supplies a new standpoint for researching atmospheric degradation mechanism and correction method for imaging in turbid atmosphere. Then, A(S) can be an effective reference for correction to the method evaluation.
WOS关键词MODULATION TRANSFER-FUNCTION
资助项目National Natural Science Foundation of China[41505023]
WOS研究方向Physics
语种英语
WOS记录号WOS:000443194600028
出版者CHINESE PHYSICAL SOC
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.hfcas.ac.cn:8080/handle/334002/38055]  
专题合肥物质科学研究院_中科院安徽光学精密机械研究所
通讯作者Wu Peng-Fei
作者单位1.Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Atmospher Opt, Hefei 230031, Anhui, Peoples R China
2.Univ Sci & Technol China, Sch Environm Sci & Optoelect Technol, Hefei 230022, Anhui, Peoples R China
推荐引用方式
GB/T 7714		 Zheng Xin,Wu Peng-Fei,Rao Rui-Zhong. Image quality analysis method under background radiation in turbid atmosphere[J]. ACTA PHYSICA SINICA,2018,67(8):10.
APA Zheng Xin,Wu Peng-Fei,&Rao Rui-Zhong.(2018).Image quality analysis method under background radiation in turbid atmosphere.ACTA PHYSICA SINICA,67(8),10.
MLA Zheng Xin,et al."Image quality analysis method under background radiation in turbid atmosphere".ACTA PHYSICA SINICA 67.8(2018):10.

入库方式： OAI收割

来源：合肥物质科学研究院

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