Image photographing method performed with terminal device having camera function
In a photographing method in which a terminal device performs photographing, a clock of the terminal device is synchronized with a clock of a server that is a reference, photographing clock time information indicating a photographing clock time based on the clock is acquired through a network, and the photographing is performed at the photographing clock time indicated by the photographing clock time information based on the clock of the terminal device already synchronized with the clock.
1. A photographing method comprising:
synchronizing a clock of a first terminal device with a reference clock;
acquiring photographing clock time information indicating a photographing clock time which is based on the reference clock through a communication network;
photographing a subject at the photographing clock time indicated by the photographing clock time information, the photographing clock time being based on the clock of the first terminal device already synchronized with the reference clock; and
specifying a photographing delay time until the photographing is performed since photographing start in the first terminal device,
wherein, in the photographing, the photographing is started at a clock time earlier than the photographing clock time indicated by the photographing clock time information by the photographing delay time.
2. The photographing method according to claim 1 , further comprising:
acquiring the photographing clock time information through the communication network with a second terminal device; and
photographing with the second terminal device at the photographing clock time indicated by the photographing clock time information, the photographing clock time being based on the reference clock.
3. The photographing method according to claim 2 , wherein
the reference clock is a clock included in a server,
the second terminal device synchronizes a clock of the second terminal device with the reference clock, and
each of the first and second terminal devices acquires the photographing clock time information from the server.
4. The photographing method according to claim 2 , wherein
the reference clock is a clock of the second terminal device, and
each of the first and second terminal devices acquires the photographing clock time information from a server.
5. The photographing method according to claim 1 , wherein
in the synchronizing, the first terminal device synchronizes a photographing clock, as the clock of the first terminal device, managed based on a system clock of the first terminal device with the reference clock.
6. The photographing method according to claim 1 , further comprising:
adding a time stamp to an image acquired by the photographing, the time stamp indicating a clock time at which the photographing is performed based on the clock of the first terminal device already synchronized with the reference clock; and
sending the image to a server.
7. The photographing method according to claim 1 , wherein, in the specifying,
every time a clock time based on the reference clock is updated, the first terminal device photographs a subject displaying the updated clock time, and
a difference between a clock time based on the clock of the first terminal device at which the photographing of the subject is started and a clock time shown in a subject image acquired by the photographing is specified as the photographing delay time.
8. The photographing method according to claim 1 , wherein
in the synchronizing,
the first terminal device sends a first packet to a server to receive a second packet indicating a clock time based on the reference clock from the server, and
the clock of the first terminal device is adjusted and synchronized with the reference clock such that a difference between the clock time indicated by the second packet and a clock time based on the clock of the first terminal device in sending the first packet to the server becomes zero.
9. The photographing method according to claim 1 , wherein
in the synchronizing,
every time a clock time based on the reference clock is updated, the first terminal device photographs a subject displaying the updated clock time, and
the clock of the first terminal device is adjusted and synchronized with the reference clock such that a difference between a clock time based on the clock of the first terminal device and a clock time shown in a subject image acquired by the photographing becomes zero.
10. The photographing method according to claim 9 , wherein
the subject displays a clock time updated based on the reference clock as a one-dimensional code or a two-dimensional code.
11. The photographing method according to claim 10 , further comprising:
coding individually a numerical value of each place expressing a clock time based on the reference clock; and
displaying the coded numerical value of each place in the subject.
12. The photographing method according to claim 11 , wherein
in the numerical value of each place,
the numerical value of a first place is updated, coded, and displayed every time the clock time based on the reference clock is updated, and
the numerical value of a second place is updated, coded, and displayed every time the clock time is updated N times, the N being an integer of 2 or more.
13. The photographing method according to claim 10 , wherein
the one-dimensional code or the two-dimensional code is a rectangle in which a horizontal width is longer than a vertical width.
14. The photographing method according to claim 1 , wherein
in the photographing, the photographing starts to photograph a moving subject from the photographing clock time indicated by the photographing clock time information, and
the first terminal device sends only a picture acquired in each second period longer than a first period in pictures acquired in each first period by the photographing of the moving image to a server.
15. The photographing method according to claim 14 , further comprising:
acquiring period information indicating the second period from the server with the first terminal device,
wherein only a picture acquired in each second period indicated by the acquired period information is selected from the pictures acquired in each first period, and the selected picture is sent to the server.
16. A photographing system comprising:
a server; and
a plurality of terminal devices connected to the server through a communication network,
wherein the server includes:
a processor; and
a memory having a computer program and a reference clock stored thereon, the computer program causing the processor to execute operations including:
synchronizing a clock of each of the plurality of terminal devices with the reference clock of the server; and
sending photographing clock time information indicating a photographing clock time which is based on the reference clock of the server to each of the plurality of terminal devices through the communication network,
each of the plurality of terminal devices includes:
a processor; and
a memory having a computer program and a clock stored thereon, the computer program causing the processor to execute operations including:
synchronizing the clock with the reference clock of the server according to synchronization processing of the server;
acquiring the photographing clock time information sent from the server through the communication network;
photographing a subject at a photographing clock time indicated by the photographing clock time information, the photographing clock time being based on the clock already synchronized with the reference clock of the server, and
specifying a photographing delay time until the photographing is performed since photographing start in each of the plurality of terminal devices,
wherein, in the photographing, the photographing is started at a clock time earlier than the photographing clock time indicated by the photographing clock time information by the photographing delay time.
17. A terminal device comprising:
a processor; and
a memory having a computer program and a clock stored thereon, the computer program causing the processor to execute operations including:
synchronizing the clock with a reference clock;
acquiring photographing clock time information indicating a photographing clock time which is based on the reference clock through a communication network; and
photographing a subject at the photographing clock time indicated by the photographing clock time information, the photographing clock time being based on the clock already synchronized with the reference clock; and
specifying a photographing delay time until the photographing is performed since photographing start in the terminal device,
wherein, in the photographing, the photographing is started at a clock time earlier than the photographing clock time indicated by the photographing clock time information by the photographing delay time.
18. A server comprising:
a processor; and
a memory having a computer program and a reference clock stored thereon, the computer program causing the processor to execute operations including:
synchronizing a clock of each of a plurality of terminal devices with the reference clock; and
sending photographing clock time information indicating a photographing clock time which is based on the reference clock to each of the plurality of terminal devices through a communication network; and
sending a specified photographing delay time until photographing is performed since photographing start in each of the plurality of terminal devices,
wherein, in the photographing, the photographing is started at a clock time earlier than the photographing clock time indicated by the photographing clock time information by the photographing delay time.
19. A non-transitory recording medium having a computer program stored and a clock thereon, the computer program causing a processor to execute operations comprising:
synchronizing the clock with a reference clock;
acquiring photographing clock time information indicating a photographing clock time which is based on the reference clock through a communication network;
causing a camera to photograph a subject at the photographing clock time indicated by the photographing clock time information, the photographing clock time being based on the clock already synchronized with the reference clock; and
specifying a photographing delay time until the photographing is performed since photographing start in the camera,
wherein, in the photographing, the photographing is started at a clock time earlier than the photographing clock time indicated by the photographing clock time information by the photographing delay time.