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Proceedings Paper

Infrared image synthesis for the wind-ruffled sea
Author(s): Xun Wang; Zhaoyi Jiang; Yun Ling; Jianqiu Jin
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Paper 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.

Paper Details

Date Published: 3 November 2005
PDF: 9 pages
Proc. SPIE 6043, MIPPR 2005: SAR and Multispectral Image Processing, 604306 (3 November 2005); doi: 10.1117/12.652382
Show Author Affiliations
Xun Wang, Zhejiang Gongshang Univ. (China)
Zhaoyi Jiang, Zhejiang Gongshang Univ. (China)
Yun Ling, Zhejiang Gongshang Univ. (China)
Jianqiu Jin, Zhejiang Gongshang Univ. (China)

Published in SPIE Proceedings Vol. 6043:
MIPPR 2005: SAR and Multispectral Image Processing
Liangpei Zhang; Jianqing Zhang; Mingsheng Liao, Editor(s)

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