公开(公告)号：US6160846A

公开(公告)日：2000-12-12

申请号：US738228

申请日：1996-10-23

申请人： Tihao Chiang ,  Huifang Sun ,  Wilson Kwok ,  Max Chien ,  Ya-Qin Zhang

发明人： Tihao Chiang ,  Huifang Sun ,  Wilson Kwok ,  Max Chien ,  Ya-Qin Zhang

IPC分类号： H04N7/30 ,  G06T9/00 ,  H04N7/26 ,  H04N7/50

CPC分类号： H04N19/517 ,  H04N19/10 ,  H04N19/115 ,  H04N19/124 ,  H04N19/126 ,  H04N19/14 ,  H04N19/146 ,  H04N19/147 ,  H04N19/152 ,  H04N19/176 ,  H04N19/186 ,  H04N19/192 ,  H04N19/61 ,  H04N19/63 ,  H04N19/64

摘要： A method and apparatus for selecting a quantizer scale for each macroblock to maintain the overall quality of the video image while optimizing the coding rate. A quantizer scale is selected for each macroblock such that target bit rate for the picture is achieved while an optimal quantization scale ratio is maintained for successive macroblocks to produce a uniform visual quality over the entire picture. One embodiment applies the method to the frame level while another embodiment applies the method in conjunction with a wavelet transform.

摘要翻译： 一种用于为每个宏块选择量化器尺度以在优化编码率的同时维持视频图像的整体质量的方法和装置。 为每个宏块选择一个量化器标尺，以便实现图像的目标比特率，同时为连续的宏块保持最佳量化比例比，以在整个图像上产生均匀的视觉质量。 一个实施例将该方法应用于帧级，而另一实施例将该方法应用于小波变换。

公开(公告)号：US06192081B1

公开(公告)日：2001-02-20

申请号：US09549244

申请日：1995-10-26

申请人： Tihao Chiang ,  Max Chien ,  Wilson Kwok ,  Huifang Sun

发明人： Tihao Chiang ,  Max Chien ,  Wilson Kwok ,  Huifang Sun

IPC分类号： H04N736

CPC分类号： H04N19/567 ,  H04N19/107 ,  H04N19/124 ,  H04N19/14 ,  H04N19/149 ,  H04N19/15 ,  H04N19/152 ,  H04N19/176 ,  H04N19/192 ,  H04N19/51 ,  H04N19/61

摘要： An apparatus and concomitant method for selecting a macroblock coding mode based upon the quantization scale selected for the macroblock. The total number of bits needed to code each macroblock consists of two parts, bits needed for coding motion vectors and bits for coding the predictive residual. The number of bits for coding the motion vectors is generally obtained from a look-up table. The number of bits for coding the predictive residual is obtained by an estimation which assumes that the number of bits for encoding the predictive residuals is directly proportional to the value of its variance and inversely proportional to the value of quantizer steps (quantizer scale). Using this estimation, the total number of bits necessary to code a macroblock is calculated and compared for each coding mode. By selecting the coding mode with the least number of bits, a near-optimal solution of low complexity for practical implementation is acquired.

摘要翻译： 一种用于基于为宏块选择的量化尺度来选择宏块编码模式的装置和并发方法。 编码每个宏块所需的总位数由两部分组成：编码运动矢量所需的位和用于编码预测残差的位。 用于编码运动矢量的比特数通常从查找表中获得。 用于对预测残差进行编码的比特数是通过估计假定用于编码预测残差的比特数与其方差的值成正比并与量化器步长（量化比例）成反比的方式获得的。 使用该估计，对于每个编码模式，计算并比较对宏块进行编码所需的总位数。 通过选择具有最少位数的编码模式，获得了用于实际实现的低复杂度的近似最优解。

公开(公告)号：US5621467A

公开(公告)日：1997-04-15

申请号：US389524

申请日：1995-02-16

申请人： Max Chien ,  HuiFang Sun ,  Wilson Kwok

发明人： Max Chien ,  HuiFang Sun ,  Wilson Kwok

IPC分类号： H04N5/94 ,  H03M13/00 ,  H04N9/88 ,  H04N19/895 ,  H04N7/68

CPC分类号： H04N19/895

摘要： A video decompression system includes block error concealment means for generating substitute data for lost blocks of pixel data. An interpolator generates both spatially and temporally interpolated or predicted blocks of data for concealing a lost block. Pixel data in the respective blocks of spatially and interpolated data are transformed to coefficients representing frequency spectra. A substitute block of coefficients is assembled from coefficients from both the transformed blocks, according to a predetermined criteria. The substitute block is transformed back to the spatial domain for substitution of lost pixel values.

摘要翻译： 视频解压缩系统包括块错误隐藏装置，用于生成丢失的像素数据块的替代数据。 内插器生成用于隐藏丢失块的空间和时间内插或预测数据块。 空间和内插数据的相应块中的像素数据被变换成表示频谱的系数。 系数的替代块根据预定标准从来自两个变换块的系数组装。 替代块被转换回空间域以替代丢失的像素值。

公开(公告)号：US07076002B1

公开(公告)日：2006-07-11

申请号：US10117823

申请日：2002-04-05

申请人： Fernando Ramirez-Mireles ,  Robert Ayrapetian ,  Dale Smith ,  Max Chien ,  Sam Heidari

发明人： Fernando Ramirez-Mireles ,  Robert Ayrapetian ,  Dale Smith ,  Max Chien ,  Sam Heidari

IPC分类号： H04L27/14 ,  H04L7/00 ,  H04J3/06 ,  H04J3/12

CPC分类号： H04L27/2662 ,  H04L27/2675

摘要： The apparatus for symbol boundary synchronization in one embodiment includes on the receive path of a multi-tone modem a window synchronizer, a converter and a symbol boundary component. The window synchronizer obtains windowed portions of the received datastream which includes symbols each expressed with a corresponding set of tones in a time domain. The windowed portions obtained in the training phase exhibit varying degrees of misalignment with the corresponding symbol boundaries. The window synchronizer is responsive to an alignment signal to obtain succeeding windowed portions of the incoming datastream aligned with the corresponding symbol boundaries therein. The converter couples to the window synchronizer to convert the set of tones from each windowed portion from the time domain to a frequency domain. The symbol boundary module couples to the converter to evaluate a phasor angle characteristic of selected tones from each windowed portion converted by the converter and to convert the phasor angle characteristic of the selected tones from a selected one of the windowed portions to the alignment signal to align the window synchronizer with the symbol boundaries in the received datastream. In an alternate embodiment of the invention the symbol boundary component couples to the window synchronizer to correlate sign values of the selected tones with a reference set and to output the alignment signal identifying the corresponding windowed portion which exhibits maximum correlation with the reference set to align the window synchronizer.

摘要翻译： 在一个实施例中，用于符号边界同步的装置在多音调制解调器的接收路径上包括窗口同步器，转换器和符号边界部件。 窗口同步器获得接收到的数据流的窗口化部分，其包括在时域中用相应的一组音调表示的符号。 在训练阶段获得的窗口部分与相应的符号边界呈现不同程度的不对准。 窗口同步器响应于对准信号以获得与其中的对应符号边界对准的输入数据流的后续窗口部分。 转换器耦合到窗口同步器，以将来自每个窗口部分的音调集从时域转换到频域。 符号边界模块耦合到转换器以评估来自由转换器转换的每个窗口部分的所选音调的相量角特性，并将所选择的音调的相量角特性从所选择的一个窗口部分转换为对准信号以对准 窗口同步器与接收到的数据流中的符号边界。 在本发明的替代实施例中，符号边界分量耦合到窗口同步器以将所选择的音调的符号值与参考集相关联，并输出识别与参考集合具有最大相关性的对应窗口部分的对准信号，以对准 窗口同步器