JPEG XT图像压缩与色调补偿的两层HDR编码

H. Kobayashi, H. Kiya
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引用次数: 5

摘要

针对两层HDR编码,提出了一种新的带有色调补偿的JPEG XT图像压缩方法。由于色调映射操作,由JPEG XT比特流生成的LDR图像在色调上有一些失真。为了抑制色彩失真,提出了一种基于最大饱和色的色彩补偿方法。此外,该方法生成的比特流与JPEG XT标准完全兼容。在实验中,根据TMQI、CIEDE2000中的色相值和恒色相平面上的最大饱和色这三种判据,证明了该方法不仅能产生色相退化较小的图像,而且能保持良好的亮度映射。
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JPEG XT Image Compression with Hue Compensation for Two-Layer HDR Coding
We propose a novel JPEG XT image compression with hue compensation for two-layer HDR coding. LDR images produced from JPEG XT bitstreams have some distortion in hue due to tone mapping operations. In order to suppress the color distortion, we apply a novel hue compensation method based on the maximally saturated colors. Moreover, the bitstreams generated by using the proposed method are fully compatible with the JPEG XT standard. In an experiment, the proposed method is demonstrated not only to produce images with small hue degradation but also to maintain well-mapped luminance, in terms of three kinds of criterion: TMQI, hue value in CIEDE2000, and the maximally saturated color on the constant-hue plane.
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