摘要:
A congestion control mechanism for TCP communication sessions is described. The congestion control mechanism adjusts the size of the congestion window based on a number, N, of parallel virtual connections. The number N of parallel virtual connections used to determine the congestion window is dynamically adjusted based on an estimation of the network condition.
摘要:
A method for transmitting real-time video data over a network involves a video source, a central server and a Web browser and comprises the following steps that: an applet is embedded into the Web browser to establish a peer-to-peer connection between the central server and the video source using UDP protocol. After receiving the video data transmitted using UDP protocol, the applet converts the received video data into TCP-based data to enable the various TCP-using video players built in the browser to play videos; and the applet converts client information from a TCP protocol format to a UDP protocol format and then sends the converted information directly to the video source.
摘要:
An embodiment of the invention provides a method for video predictive encoding. Firstly, extract a pixel block from current frame, divide the pixel block into a principal set of pixels and a complementary set of pixels; encode the principal set of pixels, output code stream of the principal set of pixels, obtain a reconstruction value of the principal set of pixels; interpolate to reconstructed pixel values, which include the reconstruction value of the principal set of pixels, take a result as predictive value of the complementary set of pixels, execute an intra-frame predictive encoding for the complementary set of pixels, output code stream of the complementary set of pixels, obtain a reconstruction value of the complementary set of pixels; and finally combine the reconstruction value of the principal set of pixels and the reconstruction value of the complementary set of pixels, and obtain a reconstruction value of the pixel block. Another embodiment of the invention also provides a device for video predictive encoding. By adopting implementation modes of the invention, compression efficiency of video encoding may be improved, implementation complexity may be lower, memory occupation may be saved, and cache hit rate may be improved. The implementation modes of the invention are suitable for highly parallel calculation, and may execute rapid encoding compression for a high-definition video source.
摘要:
A method, system, and program product for quantizing discrete cosine transform coefficients, e.g., for MPEG compression, with minimal bit rate overhead and without using a quantization matrix. This is done by scaling a uniform quantization parameter for the entire discrete cosine transform block, defining a variety of thresholds for the quantization of discrete cosine transform coefficients below which the corresponding coefficient will be quantized to zero, and setting different normative reconstructed values for coefficients that have not been quantized to zero as the decoder will still use the original, unmodified reconstructed values as long as the corresponding coefficient is not zero.
摘要:
Network transmission of live digital content from sources to receiving devices is enabled with real-time encoding, customization, and transmission of the live content according to user preferences, receiving device characteristics, network conditions and the like. Content, such as advertising customized to user profile and user location, may be conveniently inserted into the live content. Source-to-screen delay from sources to receiving devices is reduced and channel switching is supported.
摘要:
A novel system and method of Reduced-Temporal-Resolution Update (RTRU) and quantizing video transform coefficients is provided for use using hybrid coding standards when receiving a frame from within a group of video frames, where the amplitude of the quantization parameter is defined for the quantization of the frame according to a reduced temporal resolution update process; where the amplitude of the quantization parameter for macroblocks in the frame is defined according to a reduced temporal resolution update process; and where a bitstream is composed for transmission and subsequent decoding by a standard compliant decoder.
摘要:
A method, system, and program product for quantizing discrete cosine transform coefficients, e.g., for MPEG compression, with minimal bit rate overhead and without using a quantization matrix. This is done by scaling a uniform quantization parameter for the entire discrete cosine transform block, defining a variety of thresholds for the quantization of discrete cosine transform coefficients below which the corresponding coefficient will be quantized to zero, and setting different normative reconstructed values for coefficients that have not been quantized to zero as the decoder will still use the original, unmodified reconstructed values as long as the corresponding coefficient is not zero.
摘要:
A novel system and method of Reduced-Temporal-Resolution Update (RTRU) and quantizing video transform coefficients is provided for use using hybrid coding standards when receiving a frame from within a group of video frames, where the amplitude of the quantization parameter is defined for the quantization of the frame according to a reduced temporal resolution update process; where the amplitude of the quantization parameter for macroblocks in the frame is defined according to a reduced temporal resolution update process; and where a bitstream is composed for transmission and subsequent decoding by a standard compliant decoder.
摘要:
A congestion control mechanism for TCP communication sessions is described. The congestion control mechanism adjusts the size of the congestion window based on a number, N, of parallel virtual connections. The number N of parallel virtual connections used to determine the congestion window is dynamically adjusted based on an estimation of the network condition.