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    • 102. 发明授权
    • Byte-based prefix encoding
    • 基于字节的前缀编码
    • US5973626A
    • 1999-10-26
    • US42509
    • 1998-03-17
    • Toby BergerYi-Jen ChiuMikio Kawahara
    • Toby BergerYi-Jen ChiuMikio Kawahara
    • H03M7/42H03M7/40H03M7/00
    • H03M7/42
    • Two software-only prefix encoding techniques employ encoding look-up tables to produce contributions to the encoded bit stream that are incremented in integral numbers of bytes to facilitate accelerated encoding rates at the expense of an acceptable trade-off in increased memory size requirements. The first technique, referred to as offset-based encoding, employs encoding tables which eliminate most of the bit-based operations that need to be performed by a prefix encoder without inordinately expanding memory requirements. In offset-based encoding, a Huffman table is employed which contains information for each number of bits by which the length of a Huffman word is offset from an integral number of bytes. The encoding method generates bytes of encoded data, even though the Huffman code has variable length code words for each symbol to be encoded. The second technique, referred to as byte-based encoding, employs a byte-based Huffman encoding table which operates even faster than the offset-based encoding scheme because it does not employ any bit-based operations at all; however, this is achieved at the expense of a considerable expansion in memory requirements.
    • 两个仅软件前缀编码技术采用编码查找表来产生对以字节为单位递增的编码比特流的贡献,以便以增加的存储器大小要求的可接受的折衷为代价来加速编码速率。 称为基于偏移的编码的第一种技术使用编码表,其消除了需要由前缀编码器执行的大部分基于位的操作,而不会不断扩大存储器需求。 在基于偏移的编码中,使用霍夫曼表,其包含每个比特数的信息,通过该信息,霍夫曼字的长度与整数字节偏移。 编码方法生成编码数据的字节,即使霍夫曼代码对于要编码的每个符号具有可变长度代码字。 被称为基于字节的编码的第二种技术采用基于字节的霍夫曼编码表,其基于偏移的编码方案运行甚至更快,因为它完全不采用任何基于位的操作; 然而,这是以大量的内存需求扩张为代价的。
    • 106. 发明授权
    • History-based spatio-temporal noise reduction
    • 基于历史的时空噪声降低
    • US08447130B2
    • 2013-05-21
    • US11967754
    • 2007-12-31
    • Yi-Jen Chiu
    • Yi-Jen Chiu
    • G06K9/62H04N5/00
    • H04N5/21G06T5/002G06T2207/10016G06T2207/20012G06T2207/20182G06T2207/20192H04N5/144H04N19/117H04N19/86
    • Implementations of a history-based temporal motion noise filtering technique that considers the temporal smooth among multiple pictures as well as the block-based technique to estimate the noise/motion history to better reflect the spatial/temporal smoothness in the local neighborhood are provided. In particular, implementations of the per-pixel blending technique in the block-based noise measurement may be used to better manipulate pixels in both the spatial and temporal domains. A global noise detection technique may be used to estimate the occurrence and/or strength of the noise. A content adaptive spatial filtering content adaptive spatial filter based on a local edge measurement may be used to reduce picture noise as well as preserve edge sharpness. Implementations may be configured for various applications. In particular, programmability options allow users to specify the filter parameters for singularity detection, spatial-only, temporal-only and spatial-temporal filters to achieve user desirable viewing experience.
    • 提供了基于历史的时间运动噪声滤波技术的实现,其考虑多个图像之间的时间平滑以及基于块的技术来估计噪声/运动历史以更好地反映局部邻域中的空间/时间平滑度。 特别地,基于块的噪声测量中的每像素混合技术的实现可以用于更好地操纵空间和时域的像素。 可以使用全局噪声检测技术来估计噪声的发生和/或强度。 可以使用基于局部边缘测量的内容自适应空间滤波内容自适应空间滤波器来降低图像噪声以及保持边缘清晰度。 实现可以被配置用于各种应用。 特别地,可编程选项允许用户指定用于奇异性检测的过滤器参数,仅空间,仅时间和空间 - 时间过滤器,以实现用户期望的观看体验。