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1. 发明授权

US07680285B2 Adaptive estimation and compensation of clock drift in acoustic echo cancellers 有权
标题翻译：声回波消除器中时钟漂移的自适应估计和补偿
公开(公告)号：US07680285B2
公开(公告)日：2010-03-16
申请号：US11465098
申请日：2006-08-16
申请人： Joseph Cox Ballantyne , Jack Wilson Stokes, III , Henrique Malvar
发明人： Joseph Cox Ballantyne , Jack Wilson Stokes, III , Henrique Malvar
IPC分类号： A61F11/06
CPC分类号： H04B3/493 , H04M9/082
摘要： A system and method for adaptive estimation and compensation of clock drift in echo cancellers is provided. The invention includes an acoustic echo cancellation system with a built in adaptive clock drift compensation system. The acoustic echo cancellation system has an AEC component that performs acoustic echo cancellation on data from a capture buffer, by also using information derived from a render buffer. The clock drift compensation system has access to this capture buffer and render buffer. The clock drift compensation system includes a clock drift compensator that calculates, based on the current location of the capture data being processed by the AEC component as well as additional information, the ideal location in the render buffer from which the AEC component should process data. The clock drift compensator further adjusts the current location in the render buffer from which the AEC component processes data based, at least in part, upon this ideal location. The clock drift compensator can further detect and correct for glitches in the hardware positions received from the render and capture devices.
摘要翻译：提供了一种用于回波消除器中的时钟漂移的自适应估计和补偿的系统和方法。本发明包括具有内置自适应时钟漂移补偿系统的声学回波消除系统。声学回声消除系统具有通过也使用从渲染缓冲器导出的信息来执行来自捕获缓冲器的数据的声学回声消除的AEC分量。时钟漂移补偿系统可以访问此捕获缓冲区和渲染缓冲区。时钟漂移补偿系统包括时钟漂移补偿器，其基于由AEC组件处理的捕获数据的当前位置以及附加信息计算AEC组件应从其处理数据的渲染缓冲区中的理想位置。时钟漂移补偿器进一步调整渲染缓冲器中的当前位置，AEC组件至少部分地基于该理想位置处理数据。时钟漂移补偿器可以进一步检测和纠正从渲染和捕获设备接收的硬件位置的毛刺。

2. 发明授权

US07382820B2 Spread spectrum modulation system and method for embedding digital information into digital or analog media 有权
标题翻译：扩频调制系统和数字信息嵌入数字或模拟媒体的方法
公开(公告)号：US07382820B2
公开(公告)日：2008-06-03
申请号：US10865690
申请日：2004-06-10
申请人： Henrique Malvar , Dinei Florencio
发明人： Henrique Malvar , Dinei Florencio
IPC分类号： H04B1/69
CPC分类号： G06T1/005 , G06T2201/0063 , G06T2201/0065 , G06T2201/0083 , G11B20/00086 , G11B20/00913 , H04B1/69
摘要： A system and method for embedding information into digital media and later detecting the embedded information using a unique spread spectrum modulation technique. In general, the present invention removes interference caused by an original signal from the detection process thereby eliminating a major source of detection error. The interference caused by the original signal is removed by using the encoder knowledge about the original signal and modulating the energy of the embedded mark to compensate for the original signal interference. The present invention also includes a novel redundant bit representation technique causes a resulting average over a large sample to tend to zero, thereby reducing the vulnerability of the present invention to malicious collusion attacks.
摘要翻译：一种用于将信息嵌入数字媒体并随后使用独特的扩频调制技术检测嵌入信息的系统和方法。通常，本发明从检测处理中去除由原始信号引起的干扰，从而消除了主要的检测误差。通过使用关于原始信号的编码器知识和调制嵌入标记的能量来补偿原始信号干扰来消除由原始信号引起的干扰。本发明还包括一种新颖的冗余比特表示技术使得大样本上的平均结果趋于零，从而将本发明的脆弱性降低到恶意串通攻击。

3. 发明授权

US07376266B2 Segmented layered image system 有权
标题翻译：分段分层图像系统
公开(公告)号：US07376266B2
公开(公告)日：2008-05-20
申请号：US11465087
申请日：2006-08-16
申请人： Patrice Y. Simard, III , Erin L. Renshaw , James Russell Rinker , Henrique Malvar
发明人： Patrice Y. Simard, III , Erin L. Renshaw , James Russell Rinker , Henrique Malvar
IPC分类号： G06K9/00 , G06K9/36
CPC分类号： H04N1/403 , G06K9/00456
摘要： Systems and methods for encoding and decoding document images are disclosed. Document images are segmented into multiple layers according to a mask. The multiple layers are non-binary. The respective layers can then be processed and compressed separately in order to achieve better compression of the document image overall. A mask is generated from a document image. The mask is generated so as to reduce an estimate of compression for the combined size of the mask and multiple layers of the document image. The mask is then employed to segment the document image into the multiple layers. The mask determines or allocates pixels of the document image into respective layers. The mask and the multiple layers are processed and encoded separately so as to improve compression of the document image overall and to improve the speed of so doing. The multiple layers are non-binary images and can, for example, comprise a foreground image and a background image.
摘要翻译：公开了用于编码和解码文档图像的系统和方法。根据掩码将文档图像分割成多个图层。多层是非二进制的。然后可以分别对各个层进行处理和压缩，以便对整个文件图像实现更好的压缩。从文档图像生成蒙版。生成掩模，以减少对于掩模和文档图像的多个层的组合大小的压缩估计。然后使用掩模将文档图像分割成多个层。掩模将文档图像的像素确定或分配到各个图层中。掩模和多层被单独处理和编码，以便整体上改善文档图像的压缩并提高这样做的速度。多层是非二进制图像，并且可以例如包括前景图像和背景图像。

4. 发明授权

US07139435B2 Adaptive encoding and decoding of bi-level images 有权
公开(公告)号：US07139435B2
公开(公告)日：2006-11-21
申请号：US11297629
申请日：2005-12-07
申请人： Henrique Malvar
发明人： Henrique Malvar
IPC分类号： G06K9/36
CPC分类号： H04N1/417 , G06T9/004 , G06T9/005
摘要： A system and process for encoding and later decoding of bi-level images that does not use arithmetic coding, but whose performance is close to that of state-of-the-art coders such as JBIG, JBIG-2, and JB2. In general, the present bi-level coder (BLC) uses two context-based adaptive modules: 1) an adaptive predictor controlled by low-resolution probability estimates that is used to map the original pixels explicitly into prediction error pixels, and 2) a backward-adaptive Run-Length-Rice (RLR) coder that encodes the prediction error pixels. That's contrary to the usual approach where the context-dependent probability estimate controls both pixel prediction and adaptive entropy coding. Due to its simplicity, in many applications BLC may be a better choice other current coders.

5. 发明申请

US20060147029A1 System and method facilitating acoustic echo cancellation convergence detection 有权
公开(公告)号：US20060147029A1
公开(公告)日：2006-07-06
申请号：US11367293
申请日：2006-03-02
申请人： Jack Stokes , Henrique Malvar
发明人： Jack Stokes , Henrique Malvar
IPC分类号： H04M9/00 , H04M9/08 , H04M1/00
CPC分类号： H04M9/082
摘要： A system and method facilitating acoustic echo cancellation convergence detection is provided. The invention includes an acoustic echo cancellation convergence detector having a center clipping component, a convergence calculator, a convergence filter and a convergence statistic component. The invention provides for the acoustic echo cancellation convergence detector to provide an output regarding convergence of an adaptive filter based, at least in part, upon a filtered convergence statistic. Optionally, the acoustic echo cancellation convergence detector can provide an output associated with convergence history.

6. 发明申请

US20060083436A1 Adaptive encoding and decoding of bi-level images 有权
公开(公告)号：US20060083436A1
公开(公告)日：2006-04-20
申请号：US11297629
申请日：2005-12-07
申请人： Henrique Malvar
发明人： Henrique Malvar
IPC分类号： G06K9/36
CPC分类号： H04N1/417 , G06T9/004 , G06T9/005
摘要： A system and process for encoding and later decoding of bi-level images that does not use arithmetic coding, but whose performance is close to that of state-of-the-art coders such as JBIG, JBIG-2, and JB2. In general, the present bi-level coder (BLC) uses two context-based adaptive modules: 1) an adaptive predictor controlled by low-resolution probability estimates that is used to map the original pixels explicitly into prediction error pixels, and 2) a backward-adaptive Run-Length-Rice (RLR) coder that encodes the prediction error pixels. That's contrary to the usual approach where the context-dependent probability estimate controls both pixel prediction and adaptive entropy coding. Due to its simplicity, in many applications BLC may be a better choice other current coders.

7. 发明申请

US20060083432A1 System and method for encoding mosaiced image data employing a reversible color transform 有权
公开(公告)号：US20060083432A1
公开(公告)日：2006-04-20
申请号：US10968236
申请日：2004-10-19
申请人： Henrique Malvar
发明人： Henrique Malvar
IPC分类号： G06K9/36
CPC分类号： H04N9/045 , H04N1/64 , H04N2209/045
摘要： A new color space that maps image pixel values in a mosaiced sampling pattern (such as that generated by a Bayer color filter array) into four color channels that correspond to rectangular sampling patterns. Because these new channels correspond to a rectangular sampling grid, they are much more amenable to processing steps such as compression. In one embodiment, the transformation from the original mosaic-patterned pixels into the new four-channel color space can be made reversible in integer arithmetic. That allows for the implementation of efficient lossless image compression systems for mosaiced (e.g., raw, or raw Charged Couple Device (CCD)) images.

8. 发明申请

US20060078210A1 Tarp filter 有权
标题翻译：篷布过滤器
公开(公告)号：US20060078210A1
公开(公告)日：2006-04-13
申请号：US11287671
申请日：2005-11-28
申请人： Patrice Simard , Henrique Malvar , Dinei Florencio , David Steinkraus
发明人： Patrice Simard , Henrique Malvar , Dinei Florencio , David Steinkraus
IPC分类号： G06K9/36
CPC分类号： G06T9/004 , G06T9/007
摘要： Systems and methods for performing adaptive filtering are disclosed. The present invention generates probabilities that can be used in an encoder, such as an arithmetic encoder and generates those probabilities in a computationally efficient manner. Probabilities of previously encoded coefficients are employed, effectively, in generating probabilities of the coefficients without regard to directional information. Thus, a large amount of information is adaptively and efficiently used in generating the probabilities. For the coefficients, the probability is computed based at least partly on at least one probability of a previously computed probability of a neighboring coefficient. Then, the coefficients are encoded using those computed probabilities.
摘要翻译：公开了用于执行自适应滤波的系统和方法。本发明产生可以在诸如算术编码器的编码器中使用的概率，并以计算有效的方式生成这些概率。先前编码的系数的概率被有效地用于在不考虑方向信息的情况下生成系数的概率。因此，在生成概率时自适应地有效地使用大量的信息。对于系数，概率至少部分地基于先前计算的相邻系数的概率的至少一个概率来计算。然后，使用那些计算的概率对系数进行编码。

9. 发明申请

US20050276472A1 System and method for progressively transforming and coding digital data 有权
公开(公告)号：US20050276472A1
公开(公告)日：2005-12-15
申请号：US11206390
申请日：2005-08-18
申请人： Henrique Malvar
发明人： Henrique Malvar
IPC分类号： H04N11/04 , H03M7/30 , H03M7/40 , H04N1/41 , H04N1/64 , H04N19/60 , G06K9/00 , G06K9/36
CPC分类号： H04N1/646 , H04N1/41 , H04N19/60 , H04N19/635 , H04N19/91 , H04N19/93
摘要： A system and method facilitating progressively transforming and coding digital pictures is provided. The present invention via employment of a multi-resolution lapped transform provides for progressive rendering as well as mitigation of blocking artifacts and ringing artifacts as compared to many conventional compression systems. The invention includes a color space mapper, a multi-resolution lapped transform, a quantizer, a scanner and an entropy encoder. The multi-resolution lapped transform outputs transform coefficients, for example, first transform coefficients and second transform coefficients. A multi-resolution representation can be obtained utilizing second transform coefficients of the multi-resolution lapped transform. The color space mapper maps an input image to a color space representation of the input image. The color space representation of the input image is then provided to the multi-resolution lapped transform. The quantizer receives the first transform coefficients and/or the second transform coefficients and provides an output of quantized coefficients for use by the scanner and/or the entropy encoder. The scanner scans the quantized coefficients in order to produce a one-dimensional vector for use by the entropy encoder. The entropy encoder encodes the quantized coefficients received from the quantizer and/or the scanner resulting in data compression.

10. 发明申请

US20050244065A1 Adaptive compression of multi-level images 有权
标题翻译：多级图像的自适应压缩
公开(公告)号：US20050244065A1
公开(公告)日：2005-11-03
申请号：US10916721
申请日：2004-08-12
申请人： Henrique Malvar , Erin Renshaw
发明人： Henrique Malvar , Erin Renshaw
IPC分类号： H04N1/41 , G06T9/00 , H04N7/26 , H04N7/28 , G06K9/36
CPC分类号： G06K9/36 , H04N19/12 , H04N19/30 , H04N19/94
摘要： The invention facilitates adaptive compression of multi-level images, such as captured digital images of a whiteboard, etc., encoding a bitstream comprising a color image component and a black-and-white image component. Either or both of a color and a black-and-white image can be output to a user based on user desires, receiving device capabilities, etc.
摘要翻译：本发明有助于对包括彩色图像分量和黑白图像分量的比特流进行编码的诸如捕获的白板等的数字图像的多级图像的自适应压缩。可以基于用户期望，接收设备能力等向用户输出颜色和黑白图像中的一个或两者。

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