Error concealment apparatus for video signal processors
    81.
    发明授权
    Error concealment apparatus for video signal processors 失效
    视频信号处理器的错误隐藏装置

    公开(公告)号:US5365604A

    公开(公告)日:1994-11-15

    申请号:US4358

    申请日:1993-01-14

    CPC分类号: H04N19/895

    摘要: Error concealment apparatus for correcting errors in signals representing video images includes means for detecting image gradients in an area surrounding a lost block of image data. Circuitry responsive to these image gradients generates a plurality of blocks of directionally interpolated pixel values. The pixel values in the respective blocks of directionally interpolated pixel values are sorted according to amplitude, and then pixel values from mutually exclusive positions in the respective blocks are selected to form a block of pixel values for error concealment.

    摘要翻译: 用于校正表示视频图像的信号中的错误的错误隐藏装置包括用于检测围绕丢失的图像数据块的区域中的图像梯度的装置。 响应于这些图像梯度的电路产生多个定向内插像素值的块。 根据幅度对定向插值像素值的各个块中的像素值进行排序,然后选择各个块中来自互斥位置的像素值,以形成用于错误隐藏的像素值块。

    Error concealment apparatus for HDTV receivers
    82.
    发明授权
    Error concealment apparatus for HDTV receivers 失效
    高清电视接收机的错误隐藏设备

    公开(公告)号:US5247363A

    公开(公告)日:1993-09-21

    申请号:US844322

    申请日:1992-03-02

    摘要: Image reproduction is improved in an MPEG-like television receiver by inclusion of post-processing adaptive error concealment. Compressed video signal is examined to determine blocks of video signal containing errors, and error tokens are generated for identifying corresponding blocks of decompressed pixel values. Pixel values adjacent the decompressed blocks of pixel values containing errors are examined to generate estimates of the relative image motion and image detail in the area of such blocks. The block of pixel values is replaced with temporally displaced co-located blocks of pixel values or interpolated data depending upon whether the estimate of image motion is lesser or greater than the estimate of image detail.

    摘要翻译: 通过包含后处理自适应错误隐藏,在类似MPEG的电视接收机中图像再现得到改善。 检查压缩视频信号以确定包含错误的视频信号的块,并且生成用于识别解压缩像素值的对应块的错误令牌。 检查与包含错误的像素值的解压缩块相邻的像素值,以在这些块的区域中产生相对图像运动和图像细节的估计。 根据图像运动的估计是否小于或大于图像细节的估计,像素值的块被替换为时间上移位的像素值或内插数据的同位置块。

    System for encoding and decoding layered compressed video data
    83.
    发明授权
    System for encoding and decoding layered compressed video data 失效
    分层压缩视频数据的编码和解码系统

    公开(公告)号:US06553072B1

    公开(公告)日:2003-04-22

    申请号:US08890192

    申请日:1997-07-09

    IPC分类号: H04N712

    CPC分类号: H04N19/37 H04N19/30

    摘要: A dynamically configurable video signal processing system including an encoder and decoder processes data in the form of hierarchical layers. The system partitions data between hierarchical layers and allows variation in the number of layers employed. Data is automatically partitioned into one or more hierarchical layers as a function of one or more parameters selected from available system bandwidth, input data rate, and output signal quality. In addition, the image resolution and corresponding number of pixels per image of the data may be varied as a function of system parameters.

    摘要翻译: 包括编码器和解码器的可动态配置的视频信号处理系统以层级的形式处理数据。 系统在层次层之间划分数据,并允许使用层数的变化。 根据从可用系统带宽,输入数据速率和输出信号质量中选择的一个或多个参数,数据被自动分割成一个或多个分级层。 此外,数据图像的图像分辨率和相应的像素数可以作为系统参数的函数而变化。

    Apparatus and method for selecting a coding mode in a block-based coding system
    84.
    发明授权
    Apparatus and method for selecting a coding mode in a block-based coding system 失效
    用于在基于块的编码系统中选择编码模式的装置和方法

    公开(公告)号:US06192081B1

    公开(公告)日:2001-02-20

    申请号:US09549244

    申请日:1995-10-26

    IPC分类号: H04N736

    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。

    Method and apparatus for down-converting a digital signal
    86.
    发明授权
    Method and apparatus for down-converting a digital signal 失效
    用于下变频数字信号的方法和装置

    公开(公告)号:US5835151A

    公开(公告)日:1998-11-10

    申请号:US648358

    申请日:1996-05-15

    IPC分类号: H04N7/01 H04N7/26

    摘要: A method and apparatus for down-converting a digital video signal includes a synthesizer and a converter. The synthesizer receives a digital video signal including at least first and second DCT blocks of DCT coefficients, and synthesizes the first and second DCT blocks into a single synthesized DCT block having dimensions equal to the first and second DCT blocks. The converter converts the synthesized DCT block from the DCT domain to the spatial domain to produce an output digital video signal.

    摘要翻译: 用于下变频数字视频信号的方法和装置包括合成器和转换器。 合成器接收包括DCT系数的至少第一和第二DCT块的数字视频信号,并将第一和第二DCT块合成为具有等于第一和第二DCT块的尺寸的单个合成DCT块。 转换器将合成DCT块从DCT域转换为空间域,以产生输出数字视频信号。

    Apparatus for concealing errors in a digital video processing system
    87.
    发明授权
    Apparatus for concealing errors in a digital video processing system 失效
    用于隐藏数字视频处理系统中的错误的装置

    公开(公告)号:US5455629A

    公开(公告)日:1995-10-03

    申请号:US17455

    申请日:1993-02-12

    摘要: A digital video signal processing system includes apparatus for concealing errors which might occur in reproduced images due to image data lost during signal transmission. The system includes circuitry for detecting transmitted video data, generating error signals if errors are present in segments (transport blocks) of the received data, and excising segments having errors from the data stream. The received data is applied to a decoder/decompressor system which decodes and decompresses the transmitted video data according to a predetermined sequence and applies the decompressed video data to a memory (for subsequent display or recording, etc.). The decompressor is responsive to the error signals for altering the predetermined sequence.

    摘要翻译: 数字视频信号处理系统包括用于在信号传输期间由于图像数据丢失而隐藏在再现图像中可能发生的错误的装置。 该系统包括用于检测传输的视频数据的电路,如果在接收到的数据的段(传输块)中存在错误,则产生误差信号,以及从数据流切除具有错误的段。 所接收的数据被应用于解码器/解压缩器系统,该解码器/解压缩器系统根据预定的顺序解码和解压缩传输的视频数据,并将解压缩的视频数据应用于存储器(用于随后的显示或记录等)。 解压缩器响应于错误信号来改变预定的顺序。