A Real-Time Photo-Realistic Rendering Algorithm of Ocean Color Based on Bio-Optical Model  

作　　者：MA Chunyong XU Shu WANG Hongsong TIAN Fenglin CHEN Ge MA Chunyong;XU Shu;WANG Hongsong;TIAN Fenglin;CHEN Ge(College of Information Science and Engineering, Ocean University of China;Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology)

机构地区：[1]College of Information Science and Engineering, Ocean University of China [2]Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology

出　　处：《Journal of Ocean University of China》2016年第6期996-1006,共11页中国海洋大学学报（英文版）

基　　金：jointly supported by the International Cooperation and Exchange Projects of the National Natural Science Foundation of China (No.61361163001);the National Key Scientific Instrument and Equipment Development Projects of National Natural Science Foundation of China (No.41527901);the National High-Tech R&D Program (863 Program) (No.2013AA09A505)

摘　　要：Abstract A real-time photo-realistic rendering algorithm of ocean color is introduced in the paper, which considers the impact of ocean bio-optical model. The ocean bio-optical model mainly involves the phytoplankton, colored dissolved organic material （CDOM）, inorganic suspended particle, etc., which have different contributionsto absorption and scattering of light. We decompose the emergent light of the ocean surface into the reflected light from the sun and the sky, and the subsurface scattering light. We estab- lish an ocean surface transmission model based on ocean bidirectional reflectance distribution function （BRDF） and the Fresnel law, and this model＇s outputs would be the incident light parameters of subsurface scattering. Using ocean subsurface scattering algorithm combined with bio-optical model, we compute the scattering light emergent radiation in different directions. Then, we blend the re- flection of sunlight and sky light to implement the real-time ocean color rendering in graphics processing unit （GPU）. Finally, we use two kinds of radiance reflectance calculated by Hydrolight radiative transfer model and our algorithm to validate the physical reality of our method, and the results show that our algorithm can achieve real-time highly realistic ocean color scenes.A real-time photo-realistic rendering algorithm of ocean color is introduced in the paper, which considers the impact of ocean bio-optical model. The ocean bio-optical model mainly involves the phytoplankton, colored dissolved organic material(CDOM), inorganic suspended particle, etc., which have different contributions to absorption and scattering of light. We decompose the emergent light of the ocean surface into the reflected light from the sun and the sky, and the subsurface scattering light. We establish an ocean surface transmission model based on ocean bidirectional reflectance distribution function(BRDF) and the Fresnel law, and this model's outputs would be the incident light parameters of subsurface scattering. Using ocean subsurface scattering algorithm combined with bio-optical model, we compute the scattering light emergent radiation in different directions. Then, we blend the reflection of sunlight and sky light to implement the real-time ocean color rendering in graphics processing unit(GPU). Finally, we use two kinds of radiance reflectance calculated by Hydrolight radiative transfer model and our algorithm to validate the physical reality of our method, and the results show that our algorithm can achieve real-time highly realistic ocean color scenes.

关 键 词：ocean color BRDF subsurface scattering bio-optical model 

分 类 号：P731.14[天文地球—海洋科学]