利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

251 条记录 (耗时 0.019 秒)

    Apparatus for securing the integrity of a functioning system
    1.
    发明公开
    Apparatus for securing the integrity of a functioning system 失效
    在操作固定的系统的完整性的装置。

    公开(公告)号：EP0681294A3

    公开(公告)日：1999-09-15

    申请号：EP95201242.5

    申请日：1995-04-24

    申请人： GENERAL INSTRUMENT CORPORATION OF DELAWARE

    发明人： Sprunk, Eric

    IPC分类号： G11C7/00

    CPC分类号： G11C7/24

    摘要： Apparatus is provided for securing the integrity of a functioning system. The apparatus comprises a primary device for performing a function having a first vulnerability and a secondary device having a second vulnerability which is identical to the first vulnerability of the primary device. The secondary device is adapted to secure the function performed by the primary device in response to activity breaching the second vulnerability.

    Syntax parser for a video decompression processor
    2.
    发明公开
    Syntax parser for a video decompression processor 失效
    语法分析器用于视频解压缩处理器

    公开(公告)号：EP0710027A3

    公开(公告)日：1999-06-23

    申请号：EP95116143.9

    申请日：1995-10-13

    申请人： GENERAL INSTRUMENT CORPORATION OF DELAWARE

    发明人： Hoogenboom, Chris

    IPC分类号： H04N7/24

    CPC分类号： C04B41/52 ,  H04N19/00 ,  H04N19/42 ,  H04N19/61 ,  H04N19/70

    摘要： A video syntax parser (40) is provided for a video decompression processor (20). A compressed bitstream (106) is examined until a start code (100) is located. The start code (100) is decoded to enable a particular parser state corresponding thereto to be initiated. The parser state is communicated to a plurality of subsystems (36, 42, 44, 46, 48, 52, 54, 56) of the video decompression processor (20). Each subsystem monitors the parser state to determine which parsed data following the start code, if any, is intended for that subsystem. The subsystem then retrieves the parsed data it requires via a data bus (58) which receives the parsed data from the parser (40).

    Dram mapping for a digital video data decompression processor
    5.
    发明公开
    Dram mapping for a digital video data decompression processor 失效
    图DRAM用于数字Bilddatendekomprimierungsprozessor

    公开(公告)号：EP0696874A3

    公开(公告)日：1998-04-29

    申请号：EP95111989.0

    申请日：1995-07-31

    申请人： GENERAL INSTRUMENT CORPORATION OF DELAWARE

    发明人： Hoogenboom, Chris

    IPC分类号： H04N7/50

    CPC分类号： H04N19/427 ,  H04N19/423 ,  H04N19/61

    摘要： A random access memory (22) of a digital video decompression processor (20) is mapped to enable the reconstruction of successive video frames of pixel data represented by a compressed video bitstream. A FIFO buffer (86) is provided in the RAM for the compressed video bitstream. A first luminance anchor frame buffer (70) and a first chrominance anchor frame buffer (74) are provided for storing a full frame of luminance data and a full frame of chrominance data for a first anchor frame used to predict B-frames. A second luminance anchor frame buffer (76) and second chrominance anchor frame buffer (78) are provided for storing a full frame of luminance data and a full frame of chrominance data for a second anchor frame used to predict the B-frames. A first B-frame luminance buffer (80) is provided in the RAM and sized to store less than 100% of the amount of luminance data in a first B-frame field. A second B-frame luminance buffer (82) is provided in the RAM and sized to store at least 100% of the amount of luminance data in a second B-frame field. A B-frame chrominance buffer (84) is provided in the RAM to store at least 100% of the amount of chrominance data in a B-frame. The anchor frames and B-frames are read from the RAM (22) to enable the reconstruction of successive video frames. The memory mapping is particularly well suited for the decompression of PAL formatted video in an MPEG-2 decoder.

    Cancellation of distortion components in a fiber optic link with feed-forward linearization
    6.
    发明公开
    Cancellation of distortion components in a fiber optic link with feed-forward linearization 失效
    与前馈的线性化的光纤连接失真分量的抑制

    公开(公告)号：EP0792069A3

    公开(公告)日：1998-04-15

    申请号：EP97100325.6

    申请日：1997-01-10

    申请人： GENERAL INSTRUMENT CORPORATION OF DELAWARE

    发明人： Gopalakrishnan, Ganesh K.

    IPC分类号： H04N7/22

    CPC分类号： H04N7/22

    摘要： A phase modulator is provided in an externally modulated, feed-forward linearized, analog cable television (CATV) link for reducing fiber-induced composite second order (CSO) distortion components. The system is compatible with existing commercially available modulators. CSO distortion is caused, in part, by self-phase modulation of the transmitted signal in the fiber optic link. The problem is particularly prevalent when data is transmitted at a wavelength other than the minimum dispersion wavelength of the fiber. Moreover, CSO distortion increases with the length of the fiber optic link and with the optical intensity modulation index of the primary modulator of the link. The phase modulator modulates an optical signal which is provided to the primary modulator in accordance with an optical phase modulation index k of an RF data signal to be transmitted. The phase modulator is effective with fiber optic links of varying lengths which carry amplitude-modulated vestigial sideband (AM-VSB) data signals such as cable television (CATV) signals.

    Optimal disparity estimation for stereoscopic video coding
    7.
    发明公开
    Optimal disparity estimation for stereoscopic video coding 失效
    最优偏移编码立体影像信号

    公开(公告)号：EP0823826A2

    公开(公告)日：1998-02-11

    申请号：EP97113439.0

    申请日：1997-08-04

    申请人： GENERAL INSTRUMENT CORPORATION OF DELAWARE

    发明人： Chen, Xuemin ,  Liu, Vincent

    IPC分类号： H04N13/00

    CPC分类号： H04N19/597 ,  G06T7/593 ,  G06T7/97 ,  G06T9/004 ,  G06T2207/10012 ,  H04N13/133 ,  H04N13/161 ,  H04N13/189 ,  H04N13/194 ,  H04N13/218 ,  H04N13/239 ,  H04N13/296 ,  H04N2013/0081

    摘要： Disparity estimation between the right and left view pixel luminance values in a stereoscopic video signal is optimized by determining the minimum least-square-error between macroblocks of the right and left view pictures. Affine transform coefficients and disparity vectors which correspond to the minimum error are also determined and transmitted in the data stream for use by a decoder in reconstructing the right view picture. The scheme can be implemented either locally, at the macroblock level, or globally, at the picture level. At the macroblock level, least-square-error optimization may occur for each individual macroblock in the right view picture. In this case, affine transform coefficients are provided for each macroblock. At the picture level, the sum of the least-square-errors is minimized after the blocks of the right view picture are matched to the left view picture. In this case, only one set of affine transform coefficients are required for the entire right view picture. Or, block matching between an affinely transformed left view picture and the right view picture may be performed after minimizing the sum of the least-square-errors. The scheme is particularly useful in minimizing the effects of cross-channel luminance imbalances due to camera variations and scenes with significant changes in brightness or contrast, and is compatible with stereoscopic video systems such as the MPEG Multi-view Profile (MVP) system.

    Rate control for stereoscopic digital video encoding
    9.
    发明公开
    Rate control for stereoscopic digital video encoding 失效
    Ratenregelungfürstereoskopische digitale Videokodierung

    公开(公告)号：EP0817493A2

    公开(公告)日：1998-01-07

    申请号：EP97110904.6

    申请日：1997-07-02

    申请人： GENERAL INSTRUMENT CORPORATION OF DELAWARE

    发明人： Chen, Xuemin

    IPC分类号： H04N7/26

    CPC分类号： H04N19/177 ,  H04N13/15 ,  H04N13/167 ,  H04N13/189 ,  H04N13/194 ,  H04N13/218 ,  H04N13/239 ,  H04N13/296 ,  H04N19/114 ,  H04N19/115 ,  H04N19/126 ,  H04N19/149 ,  H04N19/15 ,  H04N19/152 ,  H04N19/159 ,  H04N19/172 ,  H04N19/176 ,  H04N19/30 ,  H04N19/597 ,  H04N19/60 ,  H04N2013/0085

    摘要： Rate control in a stereoscopic digital video communication system is accomplished by modifying the quantization level of P or B-frame data in the enhancement layer depending on whether the frame is temporally predicted (from the same layer) or disparity predicted (from the opposite layer). The invention can maintain a consistent image quality by providing additional quantization bits for disparity-predicted P-pictures, for example, where a P-frame may be encoded from a B-frame in the enhancement layer. The selected quantization level corresponds to an overall bit rate requirement of the enhancement layer. For disparity predicted P-frames, the quantization step size is modified according to the activity level of the frame being encoded in the enhancement layer, or of the reference frame, whichever is greater. Also, image quality is improved and frame freeze up is prevented during editing modes such as fast forward and fast rewind which require random access to the picture data. When the reference frame in the base layer is the first frame of a group of pictures (GOP), the corresponding enhancement layer frame will be encoded as an I or P frame instead of as a B frame to improve image quality and eliminate or reduce error propagation during random access.

    摘要翻译： 立体数字视频通信系统中的速率控制是通过根据帧是从时间上预测的（来自相同的层）还是视差（从相对层）来修改增强层中的P帧或B帧数据的量化级来实现的， 。 本发明可以通过为视差预测的P图像提供附加量化比特来保持一致的图像质量，例如，其中可以从增强层中的B帧对P帧进行编码。 选择的量化级别对应于增强层的总比特率要求。 对于视差预测的P帧，量化步长根据在增强层或参考帧中编码的帧的活动级别（以较高者为准）进行修改。 此外，图像质量得到改善，并且在诸如需要随机访问图像数据的快进和快退之类的编辑模式期间防止帧冻结。 当基本层中的参考帧是一组图像（GOP）的第一帧时，相应的增强层帧将被编码为I帧或P帧而不是B帧，以提高图像质量并消除或减少误差 随机访问期间的传播。