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公开(公告)号：US08386271B2
公开(公告)日：2013-02-26
申请号：US12055223
申请日：2008-03-25
IPC分类号： G10L21/04
CPC分类号： G10L19/24 , G10L19/0017 , G10L19/008 , G10L19/0212
摘要： A scalable audio codec encodes an input audio signal as a base layer at a high compression ratio and one or more residual signals as an enhancement layer of a compressed bitstream, which permits a lossless or near lossless reconstruction of the input audio signal at decoding. The scalable audio codec uses perceptual transform coding to encode the base layer. The residual is calculated in a transform domain, which includes a frequency and possibly also multi-channel transform of the input audio. For lossless reconstruction, the frequency and multi-channel transforms are reversible.
摘要翻译： 可扩展音频编解码器将输入音频信号编码为高压缩比的基本层和作为压缩比特流的增强层的一个或多个残留信号，其允许在解码时输入音频信号的无损或近无损重建。 可扩展音频编解码器使用感知变换编码来对基本层进行编码。 在变换域中计算残差，其包括输入音频的频率和可能的多通道变换。 对于无损重建，频率和多通道变换是可逆的。
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公开(公告)号：US20090248424A1
公开(公告)日：2009-10-01
申请号：US12055223
申请日：2008-03-25
IPC分类号： G10L21/04
CPC分类号： G10L19/24 , G10L19/0017 , G10L19/008 , G10L19/0212
摘要： A scalable audio codec encodes an input audio signal as a base layer at a high compression ratio and one or more residual signals as an enhancement layer of a compressed bitstream, which permits a lossless or near lossless reconstruction of the input audio signal at decoding. The scalable audio codec uses perceptual transform coding to encode the base layer. The residual is calculated in a transform domain, which includes a frequency and possibly also multi-channel transform of the input audio. For lossless reconstruction, the frequency and multi-channel transforms are reversible.
摘要翻译： 可扩展音频编解码器将输入音频信号编码为高压缩比的基本层和作为压缩比特流的增强层的一个或多个残留信号，其允许在解码时对输入音频信号进行无损或近无损重建。 可扩展音频编解码器使用感知变换编码来对基本层进行编码。 在变换域中计算残差，其包括输入音频的频率和可能的多通道变换。 对于无损重建，频率和多通道变换是可逆的。
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公开(公告)号：US20120218442A1
公开(公告)日：2012-08-30
申请号：US13035883
申请日：2011-02-25
申请人： Radhika Jandhyala , Yongjun Wu , Shijun Sun
发明人： Radhika Jandhyala , Yongjun Wu , Shijun Sun
IPC分类号： H04N5/262
CPC分类号： G06T5/50 , G06T7/20 , G06T2207/20208 , H04N5/2355
摘要： Techniques and tools for high dynamic range (“HDR”) image generation and rendering are described herein. In several described embodiments, images having distinct exposure levels are aligned. In particular embodiments, the alignment of a reference image to a non-reference image is based at least in part on motion vectors that are determined using covariance computations. Furthermore, in certain embodiments, saturated areas, underexposed areas, and/or moving objects are ignored or substantially ignored during the image alignment process. Moreover, in certain embodiments, a hierarchical pyramid block-based scheme is used to perform local motion estimation between the reference image and the non-reference image.
摘要翻译： 本文描述了用于高动态范围（“HDR”）图像生成和渲染的技术和工具。 在几个描述的实施例中，具有不同曝光水平的图像被对准。 在特定实施例中，参考图像与非参考图像的对准至少部分地基于使用协方差计算确定的运动矢量。 此外，在某些实施例中，饱和区域，曝光不足区域和/或运动物体在图像对准过程期间被忽略或基本上被忽略。 此外，在某些实施例中，使用基于分级金字塔块的方案来执行参考图像和非参考图像之间的局部运动估计。
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公开(公告)号：US08711248B2
公开(公告)日：2014-04-29
申请号：US13035883
申请日：2011-02-25
申请人： Radhika Jandhyala , Yongjun Wu , Shijun Sun
发明人： Radhika Jandhyala , Yongjun Wu , Shijun Sun
CPC分类号： G06T5/50 , G06T7/20 , G06T2207/20208 , H04N5/2355
摘要： Techniques and tools for high dynamic range (“HDR”) image generation and rendering are described herein. In several described embodiments, images having distinct exposure levels are aligned. In particular embodiments, the alignment of a reference image to a non-reference image is based at least in part on motion vectors that are determined using covariance computations. Furthermore, in certain embodiments, saturated areas, underexposed areas, and/or moving objects are ignored or substantially ignored during the image alignment process. Moreover, in certain embodiments, a hierarchical pyramid block-based scheme is used to perform local motion estimation between the reference image and the non-reference image.
摘要翻译： 本文描述了用于高动态范围（“HDR”）图像生成和渲染的技术和工具。 在几个描述的实施例中，具有不同曝光水平的图像被对准。 在特定实施例中，参考图像与非参考图像的对准至少部分地基于使用协方差计算确定的运动矢量。 此外，在某些实施例中，饱和区域，曝光不足区域和/或运动物体在图像对准过程期间被忽略或基本上被忽略。 此外，在某些实施例中，使用基于分级金字塔块的方案来执行参考图像和非参考图像之间的局部运动估计。
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