Other

Sony Corporation

Sony Electronics Inc

Pattabiraman Subramanian

Taner E Ozcelik

Ikuo Tsukagoshi

Shirish C Gadre

Yoshinori Shimizu

Takayuki Ishida

Ibrahim Cem Duruoz

Cem I Duru&ouml;z

Chem I Duruoz

Chungkuang P Chu

An apparatus and method of detecting scene changes within a video frame sequence. A video data frame pixel array is partitioned into pixel groups within a frame difference engine. Video data matching of each pixel group is compared between a preceding and following video frame. By way of example pixel group matching can be determined in response to comparing the sums of absolute pixel luminance and/or chrominance differences between corresponding pixels in corresponding pixel groups within the sequential frames against a threshold value. If an insufficient number of pixel groups match, then a scene change signal is output, such as to the encoder which decides whether to encode the entire frame or changes from prior frames. A media communication system is also described, preferably implemented within an SoC, which wirelessly communicates encoded video data for substantially simultaneous viewing by a receiver.

Video content scene change determination

A single-chip application specific integrated circuit provides autonomous management of playback of digital video and audio. The chip includes a digital video decoder and output system, and a central processing unit controlling said digital video decoder and output system. The central processing unit receives commands to establish a current playback state for management of playback of digital video and audio by said digital video decoder and output system, and responds to a video field synchronization signal and a current playback state, without external instruction, to determine whether to display digital video, whether to decode digital video for display, whether to repeat display of previously decoded digital video, and whether to skip over digital video prior to decoding digital video for output. By delivering commands to the central processing unit, the application specific integrated circuit can be caused to transition between playback states to provide desired playback of said digital video and audio.

Trick playback of digital video data

A method for operating a digital video processor including a CPU and a memory to control the presentation of demultiplexed subpicture unit (&ldquo;SPU&rdquo;) data. The play back of the subpicture is synchronized with a system clock having a clock rate varying as a function of a desired play back speed selected by a user. The method first tests during a vertical blanking period, consecutive ones of the SPU's to identify a first SPU including a PTS value having a desired relationship with respect to a value of the system clock. Next, the video processor tests during the vertical blanking period, consecutive ones of the DCSQ commands in the first SPU to identify one or more DCSQ commands with a start time value having a desired relationship with respect to the value of the system clock. Thereafter, the one or more of the DCSQ commands associated with the first SPU are parsed, and subpicture data associated with one of the parsed DCSQ commands is displayed.

Subpicture master control

A method of operating a digital video processor to continuously demultiplex, store and decode audio and video data streams and play back corresponding frames of audio and video. The processor further continuously demultiplexes, stores and decodes a first subpicture data stream and plays back first subpicture data in synchronization with the playback of frames of video data. PTS values associated with SPU's in the first subpicture data stream are continuously stored. The processor then detects a command instructing a transition from a first subpicture data stream to a second subpicture data stream and stores a PTS value associated with a first complete SPU of the second subpicture data stream so that it follows a PTS value associated with a last complete SPU in the first subpicture data stream. The processor then continuously stores PTS values associated with the SPU's in the second subpicture data stream. The first subpicture data stream is played back in synchronization with corresponding frames of video according to the stored PTS values associated with the SPU's of the first subpicture data stream; and the second subpicture data stream is played back in synchronization with corresponding frames of video according to the stored PTS values associated with the SPU's of the second subpicture data stream. The above process is executed without interrupting the continuous decoding and playback of the audio and video data streams.

Subpicture stream change control

This command manager is an Application Programming Interface (API) which provides a method for receiving and buffering commands from the host so that the host need not wait for the command to be executed, sorting these commands so that time-critical commands are executed appropriately, scheduling nonexclusive commands to the appropriate time, allowing for the prioritization of nonexclusive commands, providing macro command algorithms to allow for simplified interface with the host, providing micro command pass-through to provide an API with flexibility, and provide acknowledgment capability to the host when the command is executed.

Growing community of inventors

Santa Clara, CA, United States of America

Pattabiraman Subramanian