Two-layer Lossless HDR Coding considering Histogram Sparseness with Backward Compatibility to JPEG

2018 Picture Coding Symposium (PCS) Pub Date : 2018-06-01 DOI:10.1109/PCS.2018.8456254

Osamu Watanabe, H. Kobayashi, H. Kiya

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引用次数: 6

Abstract

An efficient two-layer coding method using the histogram packing technique with the backward compatibility to the legacy JPEG is proposed in this paper. The JPEG XT, which is the international standard to compress HDR images, adopts two-layer coding scheme for backward compatibility to the legacy JPEG. However, this two-layer coding structure does not give better lossless performance than the other existing single-layer coding methods for HDR images. Moreover, the JPEG XT has problems on determination of the lossless coding parameters; Finding appropriate combination of the parameter values is necessary to achieve good lossless performance. The histogram sparseness of HDR images is discussed and it is pointed out that the histogram packing technique considering the sparseness is able to improve the performance of lossless compression for HDR images and a novel two-layer coding with the histogram packing technique is proposed. The experimental results demonstrate that not only the proposed method has a better lossless compression performance than that of the JPEG XT, but also there is no need to determine image-dependent parameter values for good compression performance in spite of having the backward compatibility to the well known legacy JPEG standard.

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考虑直方图稀疏性且向后兼容JPEG的双层无损HDR编码

本文提出了一种有效的双层编码方法，该方法采用直方图填充技术，并具有向后兼容传统JPEG格式的特点。JPEG XT是压缩HDR图像的国际标准，为了向后兼容传统JPEG，它采用了两层编码方案。然而，这种双层编码结构对于HDR图像的无损性能并不比现有的其他单层编码方法更好。此外，JPEG XT在无损编码参数的确定上存在问题;找到合适的参数值组合是实现良好无损性能的必要条件。讨论了HDR图像的直方图稀疏性，指出考虑稀疏性的直方图填充技术能够提高HDR图像的无损压缩性能，并提出了一种新的基于直方图填充技术的二层编码方法。实验结果表明，该方法不仅具有比JPEG XT更好的无损压缩性能，而且不需要确定与图像相关的参数值以获得良好的压缩性能，尽管它具有向后兼容众所周知的传统JPEG标准。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2018 Picture Coding Symposium (PCS)

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