Transmission device, transmission method, reception device, and reception method

A transmission method comprising:

• generating, by processing circuitry of a transmission device, second moving image data by processing first moving image data in units of consecutive N pictures, the second moving image data including, for each of the units of consecutive N pictures, an averaged image data item generated by averaging image data items of the respective unit of N pictures in an averaging process, in which a non-linear average of the image data items is calculated by using different gains, and an additional image data item for each of N-1 pictures of the respective unit of N pictures without any change, the N being an integer larger than or equal to two:
• generating a video stream by encoding the averaged image data items and the additional image data items of pictures in the generated second moving image data;
• and
• transmitting the generated video stream to be processed in accordance with information about a shutter aperture time ratio of the image data item of each of the pictures in the first moving image data, wherein
• the video stream includes a first sub-layer and at least one second sub-layer,
• the first sub-layer only includes the encoded averaged image data items, and
• the at least one second sub-layer only includes the encoded additional image data items.

A reception device comprising:

• processing circuitry configured to
• receive a video stream generated by encoding averaged image data items and additional image data items of pictures in second moving image data, the second moving image data being generated by processing first moving image data in units of consecutive N pictures, the second moving image data including, for each of the units of consecutive N pictures, an averaged image data item of the averaged image data items generated by averaging image data items of the respective unit of N pictures in an averaging process, in which a non-linear average of the image data items is calculated by using different gains, and the additional image data items of N-1 pictures of the respective unit of N pictures without any change, the N being an integer larger than or equal to two,
• receive information about a shutter aperture time ratio of the image data item of each of the pictures in the first moving image data, and
• process the received video stream in accordance with the information about the shutter aperture time ratio, wherein
• the video stream includes a first sub-layer and at least one second sub-layer,
• the first sub-layer only includes the encoded averaged image data items, and
• the at least one second sub-layer only includes the encoded additional image data items.

A reception method comprising:

• receiving a video stream generated by encoding averaged image data items and additional image data items of pictures in second moving image data, the second moving image data being generated by processing first moving image data in units of consecutive N pictures, the second moving image data including, for each of the units of consecutive N pictures, an averaged image data item of the averaged image data items generated by averaging image data items of the respective unit of N pictures in an averaging process, in which a non-linear average of the image data items is calculated by using different gains, and the additional image data items of N-1 pictures of the respective unit of N pictures without any change, the N being an integer larger than or equal to two;
• receiving information about a shutter aperture time ratio of the image data item of each of the pictures in the first moving image data;
• and
• processing, by processing circuitry of a reception device, the received video stream in accordance with the information about the shutter aperture time ratio, wherein
• the video stream includes a first sub-layer and at least one second sub-layer,
• the first sub-layer only includes the encoded averaged image data items, and
• the at least one second sub-layer only includes the encoded additional image data items.

A reception device comprising:

• processing circuitry configured to receive a video stream provided by encoding an image data item of each picture in moving image data;
• receive information about a shutter aperture time ratio of the image data item of each picture in the moving image data at a frame rate of the moving image data;
• provide the moving image data at the frame rate by decoding the received video stream in accordance with the information about the shutter aperture time ratio;
• and
• provide third moving image data at a frame rate higher than the frame rate of the moving image data by interpolating the moving image data in a temporal direction, wherein
• the processing circuitry is configured to switch processes for frame interpolation in accordance with the information about the shutter aperture time ratio.