Time synchronization method of video information and bus packet formation and electronic device
A time synchronization method of video information and bus packet information includes: defining a timestamp of the video information as a basic timestamp; upon starting recording, obtaining a first-frame timestamp T0 of the video information, and aligning a first-frame timestamp of the bus packets with the first-frame timestamp T0 of the video information and recording each frame timestamp Ty of the aligned bus packets; upon stopping recording, obtaining a tail-frame timestamp T1 of the video information and a tail-frame timestamp T2 of the bus packets; setting a ratio coefficient k=(T1−T0)/(T2−T0); traversing all recorded bus packets and modifying and storing each frame timestamp Ty of these bus packets as Tx, wherein Tx=T0+(Ty−T0)*k; and each frame timestamp Tx of the bus packets is recorded with a clock of the video information as basis.
1 . A time synchronization method of video information and bus packet information, comprising:
defining a timestamp of the video information as a basic timestamp;
upon starting recording, obtaining a first-frame timestamp T0 of the video information, and aligning a first-frame timestamp of bus packets with the first-frame timestamp T0 of the video information to obtain aligned bus packets and recording each frame timestamp Ty of the aligned bus packets;
upon stopping recording, obtaining a tail-frame timestamp T1 of the video information and a tail-frame timestamp T2 of the bus packets;
setting a ratio coefficient k=(T1−T0)/(T2−T0);
traversing all recorded bus packets and modifying and storing each frame timestamp Ty of the bus packets as Tx, wherein Tx=T0+(Ty−T0)*k; and each frame timestamp Tx of the bus packets is recorded with a clock of the video information as basis;
wherein the time synchronization method is applied in a vehicle advanced driving assistance system (ADAS).
2 . The time synchronization method according to claim 1 , wherein
a method of aligning the first-frame timestamp collected for the bus packets with the first-frame timestamp T0 of the video information to obtain the aligned bus packets and recording each frame timestamp Ty collected for the aligned bus packets comprises:
defining the first-frame timestamp collected for the bus packets as T3;
defining a timestamp collected for any bus packet in a recording process as T, and obtaining each frame timestamp Ty collected for the aligned bus packets as Ty=T−T3+T0.
3 . The time synchronization method according to claim 1 , wherein
the video information is transmitted in real time to a computer; and,
the bus packets are transmitted to the computer via a bus adapter.
4 . The time synchronization method according to claim 1 , wherein
a transmission frame rate of the bus packets is greater than or equal to 1000 frames/second.
5 . A computer readable storage medium, storing computer readable instructions, wherein the computer readable instructions are executed by at least one processor to perform the time synchronization method according to claim 1 .
6 . The computer readable storage medium according to claim 5 , wherein
a method of aligning the first-frame timestamp collected for the bus packets with the first-frame timestamp T0 of the video information to obtain the aligned bus packets and recording each frame timestamp Ty collected for the aligned bus packets comprises:
defining the first-frame timestamp collected for the bus packets as T3;
defining a timestamp collected for any bus packet in a recording process as T, and obtaining each frame timestamp Ty collected for the aligned bus packets as Ty=T−T3+T0.
7 . The computer readable storage medium according to claim 5 , wherein
a transmission frame rate of the bus packets is greater than or equal to 1000 frames/second.
8 . An apparatus, comprising:
at least one readable storage medium, storing instructions;
at least one processor, configured to execute the instructions to perform the operations of:
defining a timestamp of video information as a basic timestamp;
upon starting recording, obtaining a first-frame timestamp T0 of the video information, and aligning a first-frame timestamp of bus packets with the first-frame timestamp T0 of the video information to obtain aligned bus packets and recording each frame timestamp Ty of the aligned bus packets;
upon stopping recording, obtaining a tail-frame timestamp T1 of the video information and a tail-frame timestamp T2 of the bus packets;
setting a ratio coefficient k=(T1−T0)/(T2−T0);
traversing all recorded bus packets and modifying and storing each frame timestamp Ty of the bus packets as Tx, wherein Tx=T0+(Ty−T0)*k; and
each frame timestamp Tx of the bus packets is recorded with a clock of the video information as basis;
wherein the operations are performed for a time synchronization of video information and bus packet information in a vehicle ADAS.
9 . The apparatus according to claim 8 , wherein
a method of aligning the first-frame timestamp collected for the bus packets with the first-frame timestamp T0 of the video information to obtain the aligned bus packets and recording each frame timestamp Ty collected for the aligned bus packets comprises:
defining the first-frame timestamp collected for the bus packets as T3;
defining a timestamp collected for any bus packet in a recording process as T, and obtaining each frame timestamp Ty collected for the aligned bus packets as Ty=T−T3+T0.
10 . The apparatus according to claim 8 , wherein
the video information is transmitted in real time; and,
the bus packets are transmitted via a bus adapter.
11 . The apparatus according to claim 10 , wherein
a transmission frame rate of the bus packets is greater than or equal to 1000 frames/second.
12 . An electronic device, comprising a processor, a display communicating with the processor to present a graphic interface, and a readable storage medium, wherein
the readable storage medium is configured to store an instruction program;
the processor is configured to execute the instruction program to perform the operations of:
defining a timestamp of video information as a basic timestamp;
upon starting recording, obtaining a first-frame timestamp T0 of the video information, and aligning a first-frame timestamp of bus packets with the first-frame timestamp T0 of the video information to obtain aligned bus packets and recording each frame timestamp Ty of the aligned bus packets;
upon stopping recording, obtaining a tail-frame timestamp T1 of the video information and a tail-frame timestamp T2 of the bus packets;
setting a ratio coefficient k=(T1−T0)/(T2−T0);
traversing all recorded bus packets and modifying and storing each frame timestamp Ty of the bus packets as Tx, wherein Tx=T0+(Ty−T0)*k; and
each frame timestamp Tx of the bus packets is recorded with a clock of the video information as basis;
the display is configured to display the time-synchronized bus packets and video information via the graphic interface;
wherein the operations are performed for a time synchronization of video information and bus packet information in a vehicle ADAS.
13 . The electronic device according to claim 12 , wherein
a method of aligning the first-frame timestamp collected for the bus packets with the first-frame timestamp T0 of the video information to obtain the aligned bus packets and recording each frame timestamp Ty collected for the aligned bus packets comprises:
defining the first-frame timestamp collected for the bus packets as T3;
defining a timestamp collected for any bus packet in a recording process as T, and obtaining each frame timestamp Ty collected for the aligned bus packets as Ty=T−T3+T0.
14 . The electronic device according to claim 12 , wherein
the video information is transmitted in real time; and,
the bus packets are transmitted via a bus adapter.
15 . The electronic device according to claim 12 , wherein
a transmission frame rate of the bus packets is greater than or equal to 1000 frames/second.