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102 条记录 (耗时 0.037 秒)

    Chrominance resampling for color images
    51.
    发明授权
    Chrominance resampling for color images 失效
    彩色图像的色度重采样

    公开(公告)号：US5712687A

    公开(公告)日：1998-01-27

    申请号：US637517

    申请日：1996-04-25

    申请人： T. Naveen ,  Ali Tabatabai

    发明人： T. Naveen ,  Ali Tabatabai

    IPC分类号： H04N9/64 ,  H04N9/77 ,  H04N11/02

    CPC分类号： H04N9/64 ,  H04N9/77

    摘要： Chrominance resampling for color images to produce an upsampled chrominance signal from a subsampled chrominance signal uses luminance to detect edges in the color image. The detection of edges produces an Index signal which is used to select a particular one of a plurality of lowpass filters for filtering a chrominance signal expanded from the subsampled chrominance signal. For interlaced video signals a field/frame decision is made based upon relative motion between the fields of each frame, which decision is input to the filter selection process. The resulting chrominance samples in the upsampled chrominance signal are offset to co-site the samples with the corresponding luminance samples at the output.

    摘要翻译： 彩色图像的色度重采样从子采样色度信号产生上采样色度信号使用亮度来检测彩色图像中的边缘。 边缘的检测产生一个索引信号，该索引信号用于选择多个低通滤波器中的特定的一个以对从二次采样的色度信号扩展的色度信号进行滤波。 对于隔行视频信号，基于每个帧的场之间的相对运动进行场/帧决定，该决定被输入到过滤器选择过程。 上采样色度信号中得到的色度样本被偏移以在样本与在输出处的相应亮度样本共同位置。

    Codeword space reduction for intra chroma mode signaling for HEVC
    52.
    发明授权
    Codeword space reduction for intra chroma mode signaling for HEVC 有权
    用于HEVC的色度模式信号的代码字空间减少

    公开(公告)号：US09232227B2

    公开(公告)日：2016-01-05

    申请号：US13227732

    申请日：2011-09-08

    申请人： Ehsan Maani ,  Wei Liu ,  Lina Dong ,  Ali Tabatabai

    发明人： Ehsan Maani ,  Wei Liu ,  Lina Dong ,  Ali Tabatabai

    IPC分类号： H04N19/503 ,  H04N19/159 ,  H04N19/13 ,  H04N19/593 ,  H04N19/463 ,  H04N19/186

    CPC分类号： H04N19/186 ,  H04N19/13 ,  H04N19/159 ,  H04N19/463 ,  H04N19/503 ,  H04N19/593

    摘要： Intra prediction is used in state-of-the-art video coding standards such as AVC. The intra prediction modes are coded into the bitstream. Luma and chroma components could potentially have different prediction modes. For chroma components, there are 7 different modes defined in AVC: vertical, horizontal, DC, diagonal directions, and “same as luma”. Statistics show that the “same as luma” mode is frequently used, but in AVC, this mode is encoded using more bits than other modes during entropy coding, therefore the coding efficiency is decreased. Accordingly, a modified binarization/codeword assignment for chroma intra mode signaling is able to be utilized for high efficiency video coding (HEVC), the next generation video coding standard.

    摘要翻译： 帧内预测用于诸如AVC的最先进的视频编码标准。 帧内预测模式被编码到比特流中。 亮度和色度分量可能具有不同的预测模式。 对于色度分量，在AVC中定义了7种不同的模式：垂直，水平，直流，对角线方向和“与亮度相同”。 统计显示，经常使用“与亮度相同”的方式，但在AVC中，在熵编码中，该模式比其他模式更多的位进行编码，因此编码效率降低。 因此，用于色度帧内信令的修正二值化/码字分配能够用于下一代视频编码标准中的高效率视频编码（HEVC）。

    Command description scheme providing for dynamic update of instance documents and their associated schema
    56.
    发明授权
    Command description scheme providing for dynamic update of instance documents and their associated schema 失效
    提供动态更新实例文档及其关联模式的命令描述方案

    公开(公告)号：US08296805B2

    公开(公告)日：2012-10-23

    申请号：US09865030

    申请日：2001-05-24

    申请人： Ali Tabatabai ,  Hawley K. Rising

    发明人： Ali Tabatabai ,  Hawley K. Rising

    IPC分类号： H04N5/445

    CPC分类号： H04N21/4355 ,  H04N21/234318 ,  H04N21/4586 ,  H04N21/47205 ,  H04N21/6543 ,  H04N21/84 ,  H04N21/8543

    摘要： The present invention provides a method and system for dynamically updating descriptions of AV content, such as MPEG-7 content descriptions. One embodiment provides for a method in which first a server issues a command indicating the type of update to make to the description on a client computer. Specifically, the update may be to add, delete, or change a node in a tree or graph structure describing the AV content. For example, the command may specify an update to an instance document or its associated schema. The server also specifies the location in the description to perform the update, which may be at an absolute or relative address. Next, the server sends the data, if any, to be added or used for the change. Embodiments also provide for steps to check that the update is authorized.

    摘要翻译： 本发明提供一种用于动态地更新诸如MPEG-7内容描述的AV内容的描述的方法和系统。 一个实施例提供了一种方法，其中首先服务器发出指示要在客户端计算机上描述的更新类型的命令。 具体而言，更新可以是添加，删除或改变描述AV内容的树或图形结构中的节点。 例如，该命令可以指定对实例文档或其关联模式的更新。 服务器还指定描述中执行更新的位置，可能是绝对地址或相对地址。 接下来，服务器发送要添加或用于更改的数据（如果有）。 实施例还提供了检查更新被授权的步骤。

    METHOD OF COMPRESSION OF DIGITAL IMAGES USING A FIXED NUMBER OF BITS PER BLOCK
    57.
    发明申请
    METHOD OF COMPRESSION OF DIGITAL IMAGES USING A FIXED NUMBER OF BITS PER BLOCK 有权
    使用每块固定数量的数字图像压缩的方法

    公开(公告)号：US20120219231A1

    公开(公告)日：2012-08-30

    申请号：US13035060

    申请日：2011-02-25

    申请人： Mohammad Gharavi-Alkhansari ,  Ali Tabatabai ,  Yoichi Yagasaki

    发明人： Mohammad Gharavi-Alkhansari ,  Ali Tabatabai ,  Yoichi Yagasaki

    IPC分类号： G06K9/36

    CPC分类号： H04N19/34 ,  H04N19/132 ,  H04N19/152 ,  H04N19/184 ,  H04N19/593 ,  H04N19/90

    摘要： A method of compression of digital images using a fixed number of bits per block is described. Intra-coding is used for lossless compression of digital images. The image is partitioned into blocks with the same size. The encoder generates a fixed and predetermined number of bits for each block. The encoding process includes gamma conversion applied to the input image to generate data. Additional stages include prediction, quantization, DPCM, entropy coding and refinement.

    摘要翻译： 描述了使用每个块固定位数来压缩数字图像的方法。 内部编码用于数字图像的无损压缩。 图像被分割成具有相同大小的块。 编码器为每个块生成固定和预定数量的位。 编码处理包括应用于输入图像的伽马转换以产生数据。 附加阶段包括预测，量化，DPCM，熵编码和细化。

    Method of compensating the color tone differences between two images of the same scene
    58.
    发明授权
    Method of compensating the color tone differences between two images of the same scene 有权
    补偿相同场景的两幅图像之间的色调差异的方法

    公开(公告)号：US08199384B2

    公开(公告)日：2012-06-12

    申请号：US11811717

    申请日：2007-06-11

    申请人： Jaewon Shin ,  Mohammad Gharavi-Alkhansari ,  Ali Tabatabai

    发明人： Jaewon Shin ,  Mohammad Gharavi-Alkhansari ,  Ali Tabatabai

    IPC分类号： G03F3/08

    CPC分类号： G06T5/40 ,  G06T5/009 ,  G06T2207/10016 ,  G06T2207/10024

    摘要： The color tone compensation method provides a simple and efficient method to compensate the color tone differences between two different sources of images. A first image sample, such as a still image, from a first image capturing source and a second image sample, such as a video frame, from a second image capturing source are aligned, and a tone-mapping estimation routine is applied to the two aligned images. The tone-mapping estimation routine uses the pixel intensity value histograms associated with the two aligned images and generates a tone mapping table. The tone mapping table includes a conversion intensity value for each intensity value in the second image. The conversion intensity value is a statistical measure, such as the mean, calculated according to the data in the corresponding pixel intensity value histogram. The tone-mapping table is applied to any image generated by the second image capturing source, thereby generating a new image with similar color tone as the first image generated by the first image capturing source.

    摘要翻译： 色调补偿方法提供了一种简单有效的方法来补偿两种不同图像源之间的色调差异。 将来自第一图像捕获源的第一图像样本（例如静止图像）和来自第二图像捕获源的诸如视频帧的第二图像样本对准，并且将色调映射估计例程应用于两个 对齐图像。 色调映射估计例程使用与两个对准图像相关联的像素强度值直方图，并生成色调映射表。 色调映射表包括第二图像中每个强度值的转换强度值。 转换强度值是统计度量，如平均值，根据相应像素强度值直方图中的数据计算。 色调映射表应用于由第二图像捕获源产生的任何图像，从而生成与由第一图像捕获源生成的第一图像相似的色调的新图像。

    MULTI-PARAMETER MOTION FOR EFFICIENT PREDICTION IN VIDEO COMPRESSION
    59.
    发明申请
    MULTI-PARAMETER MOTION FOR EFFICIENT PREDICTION IN VIDEO COMPRESSION 有权
    多参数运动在视频压缩中的有效预测

    公开(公告)号：US20120014452A1

    公开(公告)日：2012-01-19

    申请号：US13176124

    申请日：2011-07-05

    申请人： Ehsan Maani ,  Wei Liu ,  Ali Tabatabai

    发明人： Ehsan Maani ,  Wei Liu ,  Ali Tabatabai

    IPC分类号： H04N7/12

    CPC分类号： H04N19/52 ,  H04N19/46 ,  H04N19/547 ,  H04N19/56 ,  H04N19/70

    摘要： Motion Compensated Prediction (MCP) has been a key factor in most advanced video compression schemes. For further reduction in the residual signal energy in B-frames, bidirectional prediction where two motion-compensated signals are superimposed has also been utilized in most prior video coding standards such as MPEG-2 or MPEG-4/AVC. Syntax changes and appropriate motion vector prediction that allows efficient use of multi-parameter MCP is described. The prediction signal is constructed by linearly combining the motion-compensated signals from each parameter (or motion vector).

    摘要翻译： 运动补偿预测（MCP）一直是大多数高级视频压缩方案的关键因素。 为了进一步降低B帧中的残留信号能量，在大多数先前的视频编码标准（例如MPEG-2或MPEG-4 / AVC）中也已经使用了叠加两个运动补偿信号的双向预测。 描述了允许有效使用多参数MCP的语法改变和适当的运动矢量预测。 通过线性组合来自每个参数（或运动矢量）的运动补偿信号来构造预测信号。

    QP ADAPTIVE COEFFICIENTS SCANNING AND APPLICATION
    60.
    发明申请
    QP ADAPTIVE COEFFICIENTS SCANNING AND APPLICATION 有权
    QP自适应系统扫描和应用

    公开(公告)号：US20110249726A1

    公开(公告)日：2011-10-13

    申请号：US13078779

    申请日：2011-04-01

    申请人： Thai-Ha Nguyen ,  Yoichi Yagasaki ,  Ali Tabatabai

    发明人： Thai-Ha Nguyen ,  Yoichi Yagasaki ,  Ali Tabatabai

    IPC分类号： H04N7/32 ,  H04N7/12

    CPC分类号： H04N19/157 ,  H04N19/129 ,  H04N19/176 ,  H04N19/61

    摘要： Entropy encoding is performed in the inventive apparatus and method in response to the scanning of transform coefficients following an initial scanning pattern selected on the basis of probability statistics of non-zero coefficients for each block position. These non-zero probability statistics are ranked for a given combination of coding characteristics within the current block to arrive at an initial scanning pattern. The same initial scanning pattern selection is performed in the decoder to allow the transform coefficients to be extracted in their proper order from encoded video data. The pattern selection is applicable to both intra prediction and inter prediction. Transform coefficients are more accurately ordered in response to the invention because in adapting pattern initialization to quantization step size, high-frequency basis functions are properly taken into account.

    摘要翻译： 响应于基于对于每个块位置的非零系数的概率统计选择的初始扫描模式之后的变换系数的扫描，在本发明的装置和方法中执行熵编码。 对于当前块内的编码特性的给定组合来对这些非零概率统计进行排序，以得到初始扫描模式。 在解码器中执行相同的初始扫描模式选择，以允许以编码视频数据的正确顺序提取变换系数。 模式选择适用于帧内预测和帧间预测。 响应于本发明，变换系数被更准确地排序，因为在将模式初始化适应到量化步长时，高频基函数被适当地考虑在内。