Reception device, broadcast system, reception method, and program

A broadcast system including a transmission device and a reception device, wherein

• the transmission device transmits content and service information of the content that includes current information that indicates luminance information of a video at a current time point and preannouncement information that indicates luminance information of the video after a given time from the current time point, and
• the reception device includes:
• a service information processing unit that acquires the current information and the preannouncement information from the service information;
• a level control unit that, in a case that a preannouncement luminance range indicated by the preannouncement information changes from a current luminance range of the video at the current time point, changes the current luminance range over a given luminance transition time;
• and
• a display unit that displays the video in the current luminance range defined by the level control unit;
• the level control unit:
• determines whether the preannouncement luminance range is expanded or reduced from the current luminance range,
• changes, over a first time, the current luminance range to the preannouncement luminance range in a case that the preannouncement luminance range is expanded from the current luminance range, and
• changes, over a second time shorter than the first time, the current luminance range to the preannouncement luminance range in a case that the preannouncement luminance range is reduced from the current luminance range.

A reception method in a reception device, the reception method comprising:

• acquiring, from service information of content, current information that indicates luminance information of a video at a current time point and preannouncement information that indicates luminance information of the video after a given time from the current time point;
• in a case that a preannouncement luminance range indicated by the preannouncement information changes from a current luminance range of the video at the current time point, changing the current luminance range, in which the video is displayed, over a given luminance transition time;
• and
• determining whether the preannouncement luminance range is expanded or reduced from the current luminance range, wherein
• the current luminance range to the preannouncement luminance range is changed over a first time in a case that the preannouncement luminance range is expanded from the current luminance range, and
• the current luminance range to the preannouncement luminance range is changed over a second time shorter than the first time in a case that the preannouncement luminance range is reduced from the current luminance range.

A non-transitory computer readable recording medium storing a program causing a computer of a reception device to execute:

• acquiring, from service information of content, current information that indicates luminance information of a video at a current time point and preannouncement information that indicates luminance information of the video after a given time from the current time point;
• in a case that a preannouncement luminance range indicated by the preannouncement information changes from a current luminance range of the video at the current time point, changing the current luminance range, in which the video is displayed, over a given luminance transition time;
• and
• determining whether the preannouncement luminance range is expanded or reduced from the current luminance range, wherein
• the current luminance range to the preannouncement luminance range is changed over a first time in a case that the preannouncement luminance range is expanded from the current luminance range, and
• the current luminance range to the preannouncement luminance range is changed over a second time shorter than the first time in a case that the preannouncement luminance range is reduced from the current luminance range.