Video transmission system, video transmission device, video reception device, and video transmission method

Abstract

There are provided a video transmission system, a video transmission device, a video reception device, and a video transmission method in which each terminal can receive video of quality appropriate for the terminal when video is received simultaneously by a plurality of terminals having different characteristics. In the system, a transmission terminal (100) performs channel division of hierarchically encoded data according to its quality and band in a channel division section (106), adds to the data, the priority calculated in a priority calculation section (112) by using terminal information, and transmits the data from a video transmission section (108) via a separate channel. Moreover, a group list calculation section (114) calculates a group list in which channels are grouped according to the quality and transmits it from a group list transmission section (116). On the other hand, a reception terminal (150) decides the reception channel in a reception channel decision section (158) by using the priority quality and the group list which have been input and receives the video in a video reception section (160).

Description

technical field [0001] The invention relates to a video sending system for sending video through a network. Background technique [0002] Video data transmitted by a conventional video transmission system is generally compressed-encoded to a fixed bit rate or below by a method such as H.261 or MPEG (Motion Picture Experts Group), so that the video data can be transmitted at a fixed transmission bit rate, and Once the video data has been encoded, the video quality cannot be changed even if the transmission bit rate is changed. [0003] However, with the diversification of networks in recent years, transmission path bit rate fluctuations have increased, and video data capable of performing video transmission of quality equivalent to multiple bit rates has become necessary. In response to this need, a layered encoding method that has a layered structure and can handle multiple bit rates has been standardized. Among such layered encoding methods, specifically, recently standar...

AI Technical Summary

Problems solved by technology

[0005] However, when a plurality of terminals receive video at the same time, since the capability of the terminal receiving the video and the characteristics (reception area) of the network used by each terminal are different, there is a problem that each terminal is considered necessary different quality

[0009] However, with the above-mentioned conventional technology, although it is possible to receive video whose image quality coincides with the transmission bit rate, a plurality of terminals cannot individually freely select the type of quality to be given priority (for example, image quality as described above, motion smoothness, error resilience, spatial resolution, or processing complexity)

[0010] For example, within a limited transmission bit rate, a terminal with a large display screen is better off receiving a video with high image quality in which priority is given to consecutive images, rather than a video with smooth motion but low image quality, even if the motion is not smooth

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