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HEALPIX DCT technique for compressing PCA-based illumination adjustable images

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Abstract

An illumination adjustable image (IAI), containing a set of pre-captured reference images under various light directions, represents the appearance of a scene with adjustable illumination. One of drawbacks of using the IAI representation is that an IAI consumes a lot of memory. Although some previous works proposed to use blockwise principal component analysis for compressing IAIs, they did not consider the spherical nature of the extracted eigen-coefficients. This paper utilizes the spherical nature of the extracted eigen-coefficients to improve the compression efficiency. Our compression scheme consists of two levels. In the first level, the reference images are converted into a few eigen-images (floating point images) and a number of eigen-coefficients. In the second level, the eigen-images are compressed by a wavelet-based method. The eigen-coefficients are organized into a number of spherical functions. Those spherical coefficients are then compressed by the proposed HEALPIX discrete cosine transform technique.

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Acknowledgments

The work was supported by a research grant (CityU 116511) from General Research Fund, Hong Kong.

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Correspondence to John Sum.

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Sum, J., Leung, CS., Cheung, R.C.C. et al. HEALPIX DCT technique for compressing PCA-based illumination adjustable images. Neural Comput & Applic 22, 1291–1300 (2013). https://doi.org/10.1007/s00521-012-1003-5

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  • DOI: https://doi.org/10.1007/s00521-012-1003-5

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