Infrared image synthesis for the wind-ruffled sea

Xun Wang; Zhaoyi Jiang; Yun Ling; Jianqiu Jin

doi:10.1117/12.652382

3 November 2005 Infrared image synthesis for the wind-ruffled sea

Xun Wang, Zhaoyi Jiang, Yun Ling, Jianqiu Jin

Proceedings Volume 6043, MIPPR 2005: SAR and Multispectral Image Processing; 604306 (2005) https://doi.org/10.1117/12.652382
Event: MIPPR 2005 SAR and Multispectral Image Processing, 2005, Wuhan, China

Abstract

The sea surface as an important form of background usually plays a decisive role in sea applications. Real backgrounds are expensive while sea simulation can generate realistic images under various conditions. In this paper, a physics based model of infrared image synthesis for wind-ruffled sea is proposed. It consists of an integrated process based on oceanographic models of sea waves and radiometric properties of sky and sea. First, an analytical, semi-empirical model is introduced to construct height fields as an approximation of the sea surface based on Gaussian random numbers with spatial spectra of a prescribed form. Then, an improved model is constructed to calculate the radiance of the water surface. Infrared sea radiance is therefore composed of thermal self-emission of the sea surface, reflected radiance of the sun (moon), sky and clouds, and radiance of the atmospheric path between the sensor and the sea surface. An infrared imaging illumination model is proposed to render the sea surface based on Torrance-Sparrow reflectance model. The radiance is calculated by ray tracing. Additionally, infrared effective emissivity of sea surface is incorporated to enhance the phenomenal realism. Finally, some results of real-time animation of wind-ruffled sea surface in atmospheric window are shown. The generating images of the sea surface are in good accordance with real images.

Citation Download Citation

Xun Wang, Zhaoyi Jiang, Yun Ling, and Jianqiu Jin "Infrared image synthesis for the wind-ruffled sea", Proc. SPIE 6043, MIPPR 2005: SAR and Multispectral Image Processing, 604306 (3 November 2005); https://doi.org/10.1117/12.652382

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