TECHNICAL FIELD

The present technology relates to a transmission device, a transmission method, a reception device, a reception method, a display device, and a display method, and more particularly, for example, to a transmission device capable of performing photoelectric conversion on video data of a high dynamic range, compressing a level range, and transmitting resulting data.

BACKGROUND ART

In the past, gamma correction of correcting a gamma characteristic of a monitor by receiving data having an opposite characteristic to a characteristic of a monitor is known. For example, Non-Patent Document 1 discloses a technique of transmitting a video stream generated by encoding transmission video data obtained by applying photoelectric conversion on high dynamic range (HDR) video data having a level of 0 to 100%*N (N is larger than 1).

CITATION LIST

Non-Patent Document

Non-Patent Document 1: High Efficiency Video Coding (HEVC) text specification draft 10 (for FDIS & Last Call)

SUMMARY OF THE INVENTION

Problems to be Solved by the Invention

If a range having compatibility with a photoelectric conversion characteristic of the related art is increased, a range in which HDR effects are obtained is reduced. On the other hand, in photoelectric conversion characteristic applied to the HDR video data, if the range in which HDR effects are obtained is increased, the range having compatibility with a photoelectric conversion characteristic of the related art is reduced. As described above, in the single photoelectric conversion characteristic, it is hard to satisfy compatibility with the related art and abundant expression performance of the HDR at the same time. Meanwhile, generally, a demand for a gradation of an HDR image differs according to each image.

It is an object of the present technology to provide a technique capable of performing appropriate photoelectric conversion on HDR video data according to image content and transmitting resulting data.

Solutions to Problems

A concept of the present technology lies in

a transmission device, including:

a processing unit that performs photoelectric conversion on input video data having a level range of 0% to 100%*N (N is a number larger than 1), and obtains transmission video data;

a transmission unit that transmits a container including a video stream obtained by encoding the transmission video data; and

an information insertion unit that inserts information of an electro-optical conversion characteristic of each predetermined unit of the transmission video data into a layer of the video stream and/or a layer of the container.

In the present technology, a processing unit performs photoelectric conversion on input video data having a level range of 0% to 100%*N (N is a number larger than 1), and obtains transmission video data. A transmission unit transmits a container including a video stream obtained by encoding the transmission video data. For example, the container may be a transport stream (MPEG-2 TS) employed by a digital broadcasting standard. Further, for example, the container may be an MP4 used in delivery via the Internet or the like or a container of any other format.

An information insertion unit inserts information of an electro-optical conversion characteristic of each predetermined unit of the transmission video data into a layer of the video stream and/or a layer of the container. For example, a predetermined unit may be a scene unit or a program unit. Further, for example, the electro-optical conversion characteristic information may be type information designating a type of electro-optical conversion characteristic. Further, for example, the electro-optical conversion characteristic information may be a parameter for obtaining a curve of the electro-optical conversion characteristic.

As described above, in the present technology, the information of the electro-optical conversion characteristic of each predetermined unit of the transmission video data is inserted into the layer of the video stream and/or the layer of the container. Thus, it is possible to perform the photoelectric conversion on the HDR video data in predetermined units by selectively applying the appropriate photoelectric conversion characteristic according to the image content and transmit the resulting data.

Further, another concept of the present technology lies in

a reception device, including:

a reception unit that receives a container of a predetermined format including a video stream obtained by encoding transmission video data,

the transmission video data being obtained by performing photoelectric conversion on input video data having a level range of 0% to 100%*N (N is a number larger than 1),

information of an electro-optical conversion characteristic of each predetermined unit of the transmission video data being inserted into a layer of the video stream and/or a layer of the container; and

a processing unit that processes the video stream included in the container received by the reception unit.

In the present technology, a reception unit receives a container of a predetermined format including a video stream obtained by encoding transmission video data. The transmission video data is obtained by performing photoelectric conversion on input video data having a level range of 0% to 100%*N (N is a number larger than 1). Further, information of an electro-optical conversion characteristic of each predetermined unit of the transmission video data is inserted into a layer of the video stream and/or a layer of the container. A processing unit processes the video stream included in the container received by the reception unit.

For example, the processing unit may include a decoding unit that decodes the video stream and obtains the transmission video data and an electro-optical conversion unit that performs electro-optical conversion on the transmission video data obtained by the decoding unit based on information of the electro-optical conversion characteristic of each predetermined unit, and obtains output video data. Thus, it is possible to reproduce the HDR video data that does not undergo the photoelectric conversion at the transmission side and display the HDR image excellently.

In this case, for example, the electro-optical conversion characteristic information may be type information designating a type of the electro-optical conversion characteristic, and the electro-optical conversion unit may perform electro-optical conversion on the transmission video data based on a curve of the electro-optical conversion characteristic of the type designated by the type information. Further, in this case, for example, the electro-optical conversion characteristic information may be a parameter for obtaining a curve of the electro-optical conversion characteristic, and the electro-optical conversion unit may perform electro-optical conversion on the transmission video data based on the curve of the electro-optical conversion characteristic obtained by the parameter.

In this case, for example, the curve of the electro-optical conversion characteristic used by the electro-optical conversion unit may be obtained based on the parameter and maximum display level information, and a maximum level of the output video data may be limited to the maximum display level information. Thus, it is possible to display the HDR image excellently without incurring white collapse and the like in the display unit (display).

Further, the processing unit may include a decoding unit that decodes the video stream included in the container, and obtains the transmission video data and a transmission unit that transmits the transmission video data obtained by the decoding unit and the electro-optical conversion characteristic information of each predetermined unit of the transmission video data to an external device in association with each other. Thus, the external device can perform the electro-optical conversion on the transmission video data based on the information of the electro-optical conversion characteristic of each predetermined unit, reproduce the HDR video data that does not undergo the electro-optical conversion at the transmission side, and excellently display the HDR image.

In this case, for example, the transmission unit may transmit the transmission video data to the external device through a differential signal using a predetermined number of channels, and may insert information of the electro-optical conversion characteristic into a blanking period of the transmission video data and may transmit the electro-optical conversion characteristic information to the external device.

Further, another concept of the present technology lies in

a display device, including:

a reception unit that receives transmission video data and information of an electro-optical conversion characteristic of each predetermined unit of the transmission video data associated with the transmission video data from an external device; and

an electro-optical conversion unit that performs electro-optical conversion on the transmission video data received by the reception unit based on the information of the electro-optical conversion characteristic of each predetermined unit, and obtains output video data.

In the present technology, a reception unit receives transmission video data and information of an electro-optical conversion characteristic of each predetermined unit of the transmission video data associated with the transmission video data from an external device. An electro-optical conversion unit performs electro-optical conversion on the transmission video data received by the reception unit based on the information of the electro-optical conversion characteristic of each predetermined unit, and obtains output video data. Thus, it is possible to reproduce the HDR video data that does not undergo the electro-optical conversion and excellently display the HDR image.

In this case, for example, the electro-optical conversion characteristic information may be type information designating a type of the electro-optical conversion characteristic, and the electro-optical conversion unit may perform electro-optical conversion on the transmission video data based on a curve of the electro-optical conversion characteristic of the type designated by the type information. Further, in this case, for example, the electro-optical conversion characteristic information may be a parameter for obtaining a curve of the electro-optical conversion characteristic, and the electro-optical conversion unit may perform electro-optical conversion on the transmission video data based on the curve of the electro-optical conversion characteristic obtained by the parameter.

In this case, for example, the curve of the electro-optical conversion characteristic used by the electro-optical conversion unit may be obtained based on the parameter and maximum display level information, and a maximum level of the output video data may be limited to the maximum display level information. Thus, it is possible to display the HDR image excellently without incurring white collapse and the like in the display unit (display).

Further, another concept of the present technology lies in

a transmission device, including:

a first transmission unit that transmits a container including a video stream including encoded data of transmission video data obtained by performing photoelectric conversion on input video data having a level range of 0% to 100%*N (N is a number larger than 1); and

a second transmission unit that transmits a metafile including information for enabling a reception side to acquire the video stream,

wherein information of an electro-optical conversion characteristic of each predetermined unit of the transmission video data is inserted into the video stream and/or the metafile.

In the present technology, a first transmission unit transmits a container including a video stream including encoded data of transmission video data obtained by performing photoelectric conversion on input video data having a level range of 0% to 100%*N (N is a number larger than 1). A second transmission unit transmits a metafile including information for enabling a reception side to acquire the video stream. Further, information of an electro-optical conversion characteristic of each predetermined unit of the transmission video data is inserted into the video stream and/or the metafile.

As described above, in the present technology, the information of the electro-optical conversion characteristic of each predetermined unit of the transmission video data is inserted into the video stream and/or the metafile. Thus, it is possible to perform the photoelectric conversion on the HDR video data in predetermined units by selectively applying the appropriate photoelectric conversion characteristic according to the image content and transmit the resulting data.

Further, another concept of the present technology lies in

a transmission device, including:

a transmission unit that transmits a container including a video stream including encoded data of transmission video data obtained by performing photoelectric conversion on input video data having a level range of 0% to 100%*N (N is a number larger than 1),

wherein information of an electro-optical conversion characteristic of each predetermined unit of the transmission video data is inserted into a layer of the video stream and/or a layer of the container.

Effects of the Invention

According to the present technology, it is possible to perform appropriate photoelectric conversion on HDR video data according to image content and transmit resulting data. The effect described herein is merely an example and not limited, and an additional effect may be included.

