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Noise-resistant hemispherical basis for image-based relighting

机译:基于图像的补光的抗噪半球基础

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摘要

The spherical harmonic (SH) basis has been widely used for representing relighting data. However, under some situations, the magnitudes of the estimated SH coefficients could be very large. Hence, relit images are very sensitive to quantisation (or compression) noise of these estimated SH coefficients. To tackle this issue, this study proposes a new spherical basis, namely eigen hemispherical harmonic (EHSH) basis. Its approximation ability is the same as that of the SH basis. With this new basis, the magnitudes of the estimated coefficients are controllable. Hence, the artefacts in the relit images can be suppressed. Besides, the transform from the classical hemispherical SH coefficients to the EHSH coefficients is discussed. Finally, the authors present the way to relight images based on the EHSH basis.
机译:球形谐波(SH)基础已广泛用于表示重新照明数据。但是,在某些情况下,估计的SH系数的大小可能会很大。因此,补光图像对这些估计的SH系数的量化(或压缩)噪声非常敏感。为了解决这个问题,本研究提出了一种新的球形基础,即本征半球谐波(EHSH)基础。它的近似能力与SH基的近似能力相同。在这个新的基础上,估计系数的大小是可控的。因此,可以抑制补光图像中的伪像。此外,还讨论了从经典的半球SH系数到EHSH系数的转换。最后,作者提出了基于EHSH的图像重新照明方式。

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  • 来源
    《Image Processing, IET》 |2012年第1期|p.72-86|共15页
  • 作者单位

    Department of Electronic Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, People's Republic of China;

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  • 正文语种 eng
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