Canon Kabushiki Kaisha

Toru Suneya

Akiyoshi Hamanaka

Masahiko Takaku

Takeshi Ozawa

A transmission apparatus that transmits media data to a reception apparatus generates segments each corresponding to a predetermined time length portion of the media data, the segments including a first segment including predetermined reference data serving as a reference for play of the media data, and a second segment not including the predetermined reference data; and transmits the generated segment to the reception apparatus in response to a request for a segment from the reception apparatus. In the transmitting, based on that the segment requested by the reception apparatus is the second segment, the second segment is changed to the first segment and transmitted to the reception apparatus.

Transmission apparatus, transmission method, and non-transitory computer-readable storage medium

A providing apparatus includes a generation unit configured to generate description data describing address information to request one or more of a plurality of first segments acquired by spatially and timely segmenting a moving image, and address information to request a second segment corresponding to a spatial region broader than the first segment and a providing unit configured to provide the description data generated by the generation unit to a client apparatus.

Providing apparatus, data providing method, and storage medium

A transmission apparatus for transmitting packets through a plurality of transmission channels includes: an identifying unit configured to identify, as a candidate, one or more sets each including one or more transmission channels for use in transmitting a plurality of transmission target data packets, based on transmission speed of the plurality of transmission channels; and a determining unit configured to determine, among the one or more sets identified as the candidate by the identifying unit, a set including less number of transmission channels than another set, as a set of the transmission channel for use in transmitting the transmission target data packets.

Transmission apparatus, method for controlling transmission, and recording medium

A communication unit and a controller are included, the communication unit being configured to communicate with a communication apparatus using a first communication procedure in which authentication of the communication apparatus is performed in order to retain a communication session with the communication apparatus and using a second communication procedure that does not require authentication of the communication apparatus in order to communicate with the communication apparatus, the controller being configured to perform, using the first communication procedure and the second communication procedure, control under which it is determined whether a communication session with the communication apparatus is to be retained and perform control under which a limit is put on retaining of the communication session with the communication apparatus through the second communication procedure in a case where the communication apparatus is not authenticated as a certain communication apparatus through the first communication procedure.

Communication control apparatus, communication control method, and recording medium

A control apparatus reproducing second moving image data of which at least one of a bit rate, a frame rate, and resolution has been converted from that of first moving image data and generating an instruction to reproduce the first moving image data to synchronously reproduce control of a plurality of pieces of moving image data having different physical characteristics.

Control apparatus, reproduction control method, and recording medium

A transmission apparatus for transmitting content data to a receiving apparatus includes an establishing unit configured to establish a state where the content data can be transmitted to the receiving apparatus, a reception unit configured to receive a transmission request of the content data from the receiving apparatus in the established state where the content data can be transmitted, and a control unit configured to perform control such that, while a number of transmissions of the content data is equal to or greater than a predetermined number, the control unit does not transmit the content data to the receiving apparatus having issued the transmission request but keeps the state where the content data can be transmitted to the receiving apparatus and, when the number of transmissions of the content data becomes less than the predetermined number, the control unit permits the content data to be transmitted to the receiving apparatus.

Transmission apparatus and transmission method

A distribution apparatus for distributing content data items via multicast includes a transmitting and receiving unit and an error correction encoding unit. The transmitting and receiving unit receives reception status information regarding a reception status of the content data items in a receiving apparatus that receives the content data items. The error correction encoding unit generates recovery data used by the receiving apparatus to recover a content data item that is not successfully received among the content data items on the basis of reception status information received from the receiving apparatus that receives the content data items distributed via multicast. Subsequently, the transmitting and receiving unit distributes the generated recovery data together with the content data items via multicast.

Distribution apparatus and distribution method

A moving image reproducing apparatus which receives moving image data transmitted through a network and reproduces the moving image data includes an analysis unit adapted to analyze first moving image data stored in a storage unit and additional information of the first moving image data, a determination unit adapted to determine a storage destination on the network which is configured to acquire second moving image data following the first moving image data on the basis of the analysis result on the additional information, an acquisition unit adapted to acquire the second moving image data from the storage destination of the second moving image data, and a reproducing unit adapted to reproduce the second moving image data acquired by the acquisition unit concurrently with finishing reproduction of the first moving image data.

Moving image reproducing apparatus and method

An error pattern analysis unit specifies positions of discarded packets in continuously transmitted groups of packets. A QoS control unit estimates the cause of a communication error based on the specified positions of discarded packets, and performs QoS control based on the estimated cause of the communication error.

Transmission apparatus, receiving apparatus, and method

A transmission apparatus is provided, including a combination determination unit configured to determine combinations of data packets so that when a data packet in a first frame is missed in transmission, a recover packet (FEC packet) for recovering the missing data packet is generated based on data packets in the first frame and data packets in a second frame, and an error correction coding unit configured to generate a recover packet based on the determination made by the combination determination unit.

Transmission device, transmission method, and program for the same

A data playback device comprising a data reader which reads out moving image data from a storage device that stores the moving image data, a speed detector which detects a reading speed of the moving image data from the storage device, a data rate detector which detects a data rate of the moving image data in playback, a playback speed designation acceptance unit which accepts designation of a playback speed of the moving image data and a controller which controls reading of the moving image data by the data reader on the basis of the reading speed, the data rate, and the designated playback speed.

Data playback device, control method therefor, computer program, and recording medium

A method for transmitting moving image data that includes a plurality of frames each divided into a plurality of pieces of data includes setting a priority to each of the plurality of pieces of data based on a characteristic thereof, determining a transmission order of the plurality of pieces of data to transmit the plurality of pieces of data according to the set priority, wherein a transmission order of the plurality of pieces of data having a same priority is determined not to transmit data which is displayed at a same position in successive frames in a same transmission order, and transmitting the plurality of pieces of data in the determined transmission order.

Method for transmitting moving image data and communication apparatus

A communication apparatus which can communicate a data packet, a recovery packet used to recover a data packet that failed to be communicated, and a retransmit packet for the data packet that failed to be communicated, the communication apparatus includes a determining unit configured to determine, when a first packet of a plurality of packets that failed to be communicated is normally communicated, a packet that can be recovered, from among the plurality of the packets that failed to be communicated based on the first packet and the normally communicated recovery packet, and a retransmit determination unit configured to determine not to retransmit at least a part of the plurality of packets that can be recovered, when the first data packet is retransmitted which is determined to recover a plurality of data packets if it is normally communicated.

Communication apparatus and communication method

A communication control apparatus includes a data acquiring unit configured to acquire data to be transmitted to a receiving apparatus, a packetizing unit configured to generate packets using the data acquired by the data acquiring unit, a determining unit configured to compute a possible data transmission delay time of the data packetized by the packetizing unit and determine a transmission interval of the packets based on a result of the computation, and a transmission unit configured to transmit the packets generated by the packetizing unit at intervals that are each within the transmission interval determined by the determining unit.

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Tokyo, Japan

Toru Suneya