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    • 3. 发明申请
    • METHODS AND SYSTEMS FOR START CODE EMULATION PREVENTION AND DATA STUFFING
    • 用于开始代码仿真预防和数据填充的方法和系统
    • WO03063499A2
    • 2003-07-31
    • PCT/US0302137
    • 2003-01-22
    • MICROSOFT CORPSULLIVAN GARY JESTROP STEPHEN J
    • SULLIVAN GARY JESTROP STEPHEN J
    • H04N7/26H03M1/22H03M7/36H04N5/76H04N7/24
    • H04N21/23424H04J3/0605H04J3/07H04N19/184H04N19/70H04N19/91H04N21/2343H04N21/44016H04N21/8455
    • Methods and systems provide approaches to start code emulation prevention at a granularity higher than the bit level. By operating at a level other than the bit level, processing capability requirements on both the encoder and decoder side can be reduced. In accordance with one or more embodiments, a start code emulation prevention method looks for data patterns relative to fixed-size data portions larger than single bits. When a particular pattern is found, start code emulation prevention data is inserted to prevent start code emulation. The inserted data is larger than a single bit and, in some embodiments, comprises a byte. When a decoder decodes data that has had start code emulation prevention data inserted, it can easily identify legitimate start codes and then can remove the start code emulation prevention data to provide the original data that was protected. In addition, a data stuffing method is described which allows payload data to be rounded up in size to an integer number of byte sizes, and then allows filler data to be added in a manner which is easily detectable by a decoder.
    • 方法和系统提供了以比位级更高的粒度开始代码仿真预防的方法。 通过以比特级别以外的级别进行操作,可以减少编码器和解码器侧的处理能力要求。 根据一个或多个实施例,起始代码仿真预防方法寻找相对于大于单个位的固定大小数据部分的数据模式。 当找到特定模式时,插入启动代码仿真预防数据以防止启动代码仿真。 插入的数据大于单个位,并且在一些实施例中包括一个字节。 当解码器解码插入了启动代码仿真阻止数据的数据时,它可以轻松识别合法的启动代码,然后可以删除启动代码仿真阻止数据,以提供受保护的原始数据。 另外,描述了一种数据填充方法,其允许有效载荷数据被四舍五入为整数个字节大小,然后允许填充数据以易于被解码器检测的方式添加。
    • 5. 发明申请
    • METHODS AND SYSTEMS FOR ENCODING AND DECODING VIDEO DATA TO ENABLE RANDOM ACCESS AND SPLICING
    • 用于编码和解码视频数据以实现随机访问和分离的方法和系统
    • WO2003063500A1
    • 2003-07-31
    • PCT/US2003/002138
    • 2003-01-22
    • MICROSOFT CORPORATIONSULLIVAN, Gary, J.
    • SULLIVAN, Gary, J.
    • H04N7/26
    • H04N21/23424H04J3/0605H04J3/07H04N19/184H04N19/70H04N19/91H04N21/2343H04N21/44016H04N21/8455
    • Various embodiments provide approaches that facilitate decoding in the context of video coding standards that allow for complicated dependencies among pictures of an encoded sequence of pictures. In some embodiments, the notion of a random access point or "RAP" is utilized. A random access point is effectively a location within a picture sequence that contains information that facilitates random access of the sequence. In some embodiments, a random access point can contain different types of data. Such data can be defined, in some embodiments, in terms of picture count and/or time. In some embodiments, a random access point's data can comprise one or more of an entry point and a recovery point. These points effectively provide measures that a decoder can use to ascertain when its decoding activities will result in accurately and suitably decoded pictures.
    • 各种实施例提供了便于在视频编码标准的上下文中进行解码的方法,其允许编码的图像序列的图像之间的复杂依赖性。 在一些实施例中,利用随机接入点或“RAP”的概念。 随机接入点实际上是图像序列内的位置,其包含促进序列随机访问的信息。 在一些实施例中,随机接入点可以包含不同类型的数据。 在一些实施例中,可以在图像数量和/或时间方面定义这样的数据。 在一些实施例中,随机接入点的数据可以包括入口点和恢复点中的一个或多个。 这些点有效地提供了解码器可以用来确定其解码活动何时将导致精确和适当地解码的图像的措施。