Video reception method, video transmission method, video reception apparatus, and video transmission apparatus

#The present disclosure relates to a video reception method, a video transmission method, a video reception apparatus, and a video transmission apparatus.

#The high dynamic range (HDR) has been drawing attention as a scheme covering a luminance range with an increased maximum luminance value in order to represent bright light such as mirror-reflected light that cannot be represented using current TV signals, with brightness closer to the actual brightness while maintaining dark grayscale values of existing video. Specifically, the scheme covering the luminance range supported by the existing TV signals is called the standard dynamic range (SDR) and has the maximum luminance value of 100 nits. In contrast, the HDR is expected to have an increased maximum luminance value of at least 1000 nits (see ARIB STANDARD ARIB STD-B67 Version 1.0 Jul. 3, 2015 (Non-Patent Literature (NPL) 1)).

#In transmission or reception of video signals supporting a plurality of luminance dynamic ranges as described above, it is desired that a reception apparatus be capable of displaying more appropriate video.

#These and other objects, advantages and features of the disclosure will become apparent from the following description thereof taken in conjunction with the accompanying drawings that illustrate a specific embodiment of the present disclosure.

#FIG. 1 is a block diagram of a video reception apparatus according to Embodiment 1;

#FIG. 2 is a flow chart of processing performed by a display controller according to Embodiment 1;

#(Underlying Knowledge Forming Basis of the Present Disclosure)

#According to, for example, a video coding standard known as ITU-T H.265|ISO/IEC 23008-2 HEVC, the optical-electro transfer function (OETF) or electro-optical transfer function (EOTF) of a video signal is notified of using a syntax known as transfer characteristics in video usability information (VUI) included in a sequence parameter set (SPS). Use of the transfer characteristics in the SPS enables notification of switching of transfer characteristics (transfer function) at frame accuracy. A video reception apparatus determines a method of controlling a video display, based on the transfer characteristics.

#According to the MPEG-2 transport stream (TS) standard, which is used for transmitting a video signal and an audio signal in a multiplexed manner as in the case of TV broadcast etc., there is a known method of including, in a descriptor of program-specific information (PSI), a parameter included in the aforementioned SPS and information related to the parameter, and transmitting information related to an operation of the video reception apparatus in an upper layer. By using the descriptor of the PSI for the transfer characteristics as well, the video reception apparatus can more easily determine a method of controlling the video display. Since the PSI is generally inserted into a multiplexed stream at a constant cycle, the PSI is not synchronized with frames of a video signal. Note that according to the MPEG-H MPEG media transport (MMT) standard, a structure similar to the PSI is defined as MMT-SI.