Media data processing method, apparatus and system
Several embodiments of the present invention are described for a media data processing method, apparatus and system. An example method comprises: obtaining an optical signal of a sampling point by a collection device at the source end in an acquisition of media data; according to an opto-electronic transfer control parameter, performing opto-electronic transfer for the optical signal of the sampling point to obtain a transferred electrical signal, wherein the opto-electronic transfer control parameter is determined on the basis of an optical signal intensity of the optical signal of the sampling point; and encoding the electrical signal and opto-electronic transfer control parameter to obtain a bitstream. According to the embodiment of the present invention, the problem of the lower accuracy in the media data processing is solved, thereby obtaining the effect of improving the accuracy in the media data processing.
1. A method for processing media data, comprising:
parsing a bitstream, and acquiring an electrical signal to be processed and an electro-optical transfer control parameter;
performing electro-optical transfer on the electrical signal according to the electro-optical transfer control parameter, to obtain an optical signal intensity of the transferred optical signal; and
controlling a display device at destination end to display according to the optical signal intensity of the optical signal;
wherein acquiring the electro-optical transfer control parameter comprises: acquiring an optical signal intensity of the optical signal carried in the electrical signal and a display brightness of the display device at destination end; and determining the electro-optical transfer control parameter according to the optical signal intensity of the optical signal carried in the electrical signal and the display brightness of the display device at destination end;
wherein acquiring the optical signal intensity of the optical signal carried in the electrical signal and the display brightness of the display device at destination end comprises: acquiring a maximum optical signal intensity and a minimum optical signal intensity carried in the electrical signal; and acquiring a maximum brightness and a minimum brightness of the display device at destination end; and
wherein determining the electro-optical transfer control parameter according to the optical signal intensity of the optical signal carried in the electrical signal and the display brightness of the display device at destination end comprises:
p
=
M
N
·
H
L
wherein, p denotes the electro-optical transfer control parameter; M denotes the maximum brightness of the display device at destination end; N denotes the minimum brightness of the display device at destination end; H denotes the maximum optical signal intensity; and L denotes the minimum optical signal intensity.
2. The method according to claim 1 , wherein performing electro-optical transfer on the electrical signal according to the electro-optical transfer control parameter, to obtain an optical signal intensity of the transferred optical signal comprises:
determining that the electrical signal intensity of the electrical signal is greater than a predetermined threshold; and
in response to determining that the electrical signal intensity of the electrical signal is greater than the predetermined threshold, performing electro-optical transfer on the electrical signal intensity of the electrical signal with the electro-optical transfer control parameter to obtain an optical signal intensity of the optical signal corresponding to the electrical signal intensity of the electrical signal.
3. The method according to claim 1 , wherein acquiring the electro-optical transfer control parameter further comprises:
acquiring the electro-optical transfer control parameter signalled in the bitstream.
4. The method according to claim 3 , wherein acquiring the electro-optical transfer control parameter signalled in the bitstream comprises at least one of:
acquiring the electro-optical transfer control parameter signalled in a parameter set data unit in the bitstream;
acquiring the electro-optical transfer control parameter signalled in a supplementary enhancement information data unit in the bitstream; and
acquiring the electro-optical transfer control parameter signalled in a system layer data unit in the bitstream.
5. The method according to claim 4 , wherein the electro-optical transfer control parameter signalled in the supplementary enhancement information data unit overwrites the electro-optical transfer control parameter signalled in the parameter set data unit and/or the electro-optical transfer control parameter signalled in the system layer data unit, and wherein the electro-optical transfer control parameter signalled in the parameter set data unit overwrites the electro-optical transfer control parameter signalled in the system layer data unit.
6. The method according to claim 1 , wherein before controlling the display device at destination end to display according to the optical signal intensity of the optical signal, the method further comprises:
performing gamma correction on the optical signal.
7. A media data processing apparatus, comprising:
a processor; and
a non-transitory computer-readable storage medium for storing instructions which, when executed by the processor, cause the processor to perform a method comprising:
parsing a bitstream, and acquire an electrical signal to be processed and an electro-optical transfer control parameter;
performing electro-optical transfer on the electrical signal according to the electro-optical transfer control parameter, to obtain an optical signal intensity of the transferred optical signal; and
controlling a display device at destination end to display according to the optical signal intensity of the optical signal;
wherein acquiring the electro-optical transfer control parameter comprises: acquiring an optical signal intensity of the optical signal carried in the electrical signal and a display brightness of the display device at destination end; and determining the electro-optical transfer control parameter according to the optical signal intensity of the optical signal carried in the electrical signal and the display brightness of the display device at destination end;
wherein acquiring the optical signal intensity of the optical signal carried in the electrical signal and the display brightness of the display device at destination end comprises: acquiring a maximum optical signal intensity and a minimum optical signal intensity carried in the electrical signal; and acquiring a maximum brightness and a minimum brightness of the display device at destination end; and
wherein determining the electro-optical transfer control parameter according to the optical signal intensity of the optical signal carried in the electrical signal and the display brightness of the display device at destination end comprises:
p
=
M
N
·
H
L
wherein, p denotes the electro-optical transfer control parameter; M denotes the maximum brightness of the display device at destination end; N denotes the minimum brightness of the display device at destination end; H denotes the maximum optical signal intensity; and L denotes the minimum optical signal intensity.
8. The apparatus according to claim 7 , wherein the method performed by the processor further comprises:
determining that the electrical signal intensity of the electrical signal is greater than a predetermined threshold; and
in response to determining that the electrical signal intensity of the electrical signal is greater than the predetermined threshold, performing electro-optical transfer on the electrical signal intensity of the electrical signal with the electro-optical transfer control parameter to obtain an optical signal intensity of the optical signal corresponding to the electrical signal intensity of the electrical signal.
9. The apparatus according to claim 7 , wherein the method performed by the processor further:
acquiring the electro-optical transfer control parameter signalled in the bitstream.
10. The apparatus according to claim 9 , wherein the method performed by the processor further comprises at least one of:
acquiring the electro-optical transfer control parameter signalled in a parameter set data unit in the bitstream;
acquiring the electro-optical transfer control parameter signalled in a supplementary enhancement information data unit in the bitstream; and
acquiring the electro-optical transfer control parameter signalled in a system layer data unit in the bitstream.
11. The apparatus according to claim 10 , wherein the electro-optical transfer control parameter signalled in the supplementary enhancement information data unit overwrites the electro-optical transfer control parameter signalled in the parameter set data unit and/or the electro-optical transfer control parameter signalled in the system layer data unit.