Method for transmitting appropriate meta data to display device according to transmission protocol version

• US 10,291,955 B2
• Filed: 07/20/2016
• Issued: 05/14/2019
• Est. Priority Date: 08/19/2014
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Toma, Tadamasa, Yahata, Hiroshi, Ogawa, Tomoki
• Primary Examiner(s): Chowdhury, Nigar
• Application Number:
  US15/214,507
• Publication Number:
  US 20160330513A1
• Time in Patent Office: 1,028 Days
• Field of Search: 386230, 386248
• CPC Class Codes: H04N 21/4325 by playing back content from the storage medium reproduction of recorded television signals H04N5/76; reproduction of recorded television signals H04N9/79
• CPC Class Codes: H04N 21/435 Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
• CPC Class Codes: H04N 21/43615 Interfacing a Home Network, e.g. for connecting the client to a plurality of peripherals home Audio Video Interoperability [HAVI] data switching networks H04L12/2805
• CPC Class Codes: H04N 21/44008 involving operations for analysing video streams, e.g. detecting features or characteristics in the video stream arrangements characterised by components specially adapted for monitoring, identification or recognition of video in broadcast systems H04H60/59
• CPC Class Codes: H04N 21/440218 by transcoding between formats or standards, e.g. from MPEG-2 to MPEG-4 conversion of standards in analogue television systems H04N7/01
• CPC Class Codes: H04N 21/44029 for generating different versions
• CPC Class Codes: H04N 5/57 Control of contrast or brightness
• CPC Class Codes: H04N 5/77 between a recording apparatus and a television camera
• CPC Class Codes: H04N 9/8205 involving the multiplexing of an additional signal and the colour video signal

Abstract

A transmitting method according to one aspect of the present disclosure is a transmitting method of a playback device, and includes: when a version of a transmission protocol is a first version, transmitting first meta data to a display device without transmitting second meta data to the display device, the transmission protocol being used to transmit a signal between the playback device and the display device, the first meta data including information that is commonly used for a plurality of images included in a continuous playback unit of a first video signal and relates to a luminance range of the first video signal, and the second meta data including information that is commonly used for a unit subdivided compared to the continuous playback unit of the first video signal and relates to the luminance range of the first video signal; and when the version of the transmission protocol is a second version, transmitting the first meta data and the second meta data to the display device.

Claims

1. A method used by a playback device, the method comprising:

when a first version of a transmission protocol is being used to transmit a signal between the playback device and a display device, transmitting first meta data to the display device using the first version of the transmission protocol without transmitting second meta data to the display device; and

when a second version of the transmission protocol is being used to transmit the signal between the playback device and the display device, transmitting the first meta data and the second meta data to the display device using the second version of the transmission protocol, the second version of the transmission protocol being different from the first version of the transmission protocol,

wherein the first meta data including information that is commonly used for a plurality of images included in a continuous playback unit of a first video signal and relates to a luminance range of the first video signal, and

wherein the second meta data includes information that is commonly used for a unit subdivided compared to the continuous playback unit of the first video signal and relates to the luminance range of the first video signal.

2. The method according to claim 1, further comprising

when the version of the transmission protocol is the first version, (i) performing a conversion process of converting the luminance range of the first video signal by using the second meta data to obtain a second video signal and (ii) transmitting the second video signal to the display device.

3. The method according to claim 1, further comprising:

when the version of the transmission protocol is the second version and when the display device does not include a capability of performing a conversion process of converting the luminance range of the first video signal by using the second meta data, (i) performing the conversion process to obtain a second video signal and (ii) transmitting the second video signal to the display device; and

when the version of the transmission protocol is the second version and when the display device includes the capability of performing the conversion process, transmitting the first video signal to the display device without performing the conversion process.

4. The method according to claim 1, wherein

when the playback device does not include a capability of a conversion process of converting the luminance range of the first video signal by using the second meta data, the second meta data is not transmitted to the display device without performing the conversion process.

5. The method according to claim 1, wherein

a luminance value of the first video signal is encoded as a code value, and

the first meta data includes information for specifying an EOTF (Electro-Optical Transfer Function) of associating a plurality of luminance values and a plurality of code values.

6. The method according to claim 1, wherein

the second meta data indicates mastering characteristics of the first video signal.

7. The method according to claim 1, wherein

the transmission protocol is High Definition Multimedia Interface (HDMI), and

the second version of the transmission protocol is an older version of HDMI than the first version of the transmission protocol.

8. A playback device comprising one or more memories and circuitry which, in operation:

transmits, when a first version of a transmission protocol is being used to transmit a signal between the playback device and a display device, first meta data to a display device using the first version of the transmission protocol without transmitting second meta data to the display device; and

transmits, when a second version of the transmission protocol is being used to transmit a signal between the playback device and the display device, the first meta data and the second meta data to the display device using the second version of the transmission protocol,

wherein the first meta data including information that is commonly used for a plurality of images included in a continuous playback unit of a first video signal and relates to a luminance range of the first video signal, and

wherein the second meta data includes information that is commonly used for a unit subdivided compared to the continuous playback unit of the first video signal and relates to the luminance range of the first video signal.