CN110971818A - Time calibration method and device, auxiliary slave equipment and auxiliary master equipment - Google Patents
Time calibration method and device, auxiliary slave equipment and auxiliary master equipment Download PDFInfo
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- CN110971818A CN110971818A CN201911137384.0A CN201911137384A CN110971818A CN 110971818 A CN110971818 A CN 110971818A CN 201911137384 A CN201911137384 A CN 201911137384A CN 110971818 A CN110971818 A CN 110971818A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/665—Control of cameras or camera modules involving internal camera communication with the image sensor, e.g. synchronising or multiplexing SSIS control signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0644—External master-clock
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/90—Arrangement of cameras or camera modules, e.g. multiple cameras in TV studios or sports stadiums
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/04—Synchronising
- H04N5/06—Generation of synchronising signals
- H04N5/067—Arrangements or circuits at the transmitter end
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Abstract
The embodiment of the invention provides a time calibration method, a device, an auxiliary slave device and an auxiliary master device, which are applied to a camera auxiliary device divided into auxiliary slave devices in a camera auxiliary system.
Description
Technical Field
The invention relates to the technical field of cameras, in particular to a time calibration method and device, auxiliary slave equipment and auxiliary master equipment.
Background
In the process of recording a movie program, a plurality of cameras are often required to shoot programs at different positions and different scenes, for example, when recording a variety, a first camera is responsible for shooting facing to a stage, the whole process of the program can be shot, a second camera is responsible for shooting facing to a designated star, and a third camera is responsible for capturing a wonderful moment. However, since the time for each camera to start shooting may be different and some cameras may pause shooting midway, a large amount of videos generated by these cameras do not have uniform time information, and during post-editing program production, the videos need to be synchronized in time manually.
In the prior art, there is a camera auxiliary device, which can be installed on a camera, and during a shooting process of the camera, it can input an audio signal containing time information to the camera through an audio input interface of the camera, so that when a video recorded by the camera is processed in a later period, the time information can be read from audio data of the video, thereby further determining a recording time of the video.
In order to ensure time synchronization of the cameras in one shooting scene, camera auxiliary equipment needs to be installed on each camera, and when time synchronization is needed, shooting time of each video can be determined through audio data in the video shot by each camera, and then the videos shot by each camera can be synchronized.
The inventor finds that the prior art at least has the following problems in the process of implementing the invention:
in order to ensure accurate time synchronization of video captured by each camera, the time of each camera-attached auxiliary device needs to be kept consistent, and a time synchronization method applied to each camera-attached auxiliary device is lacking in the prior art.
Disclosure of Invention
The embodiment of the invention aims to provide a time calibration method, a time calibration device, auxiliary slave equipment and auxiliary master equipment so as to ensure the time consistency of a plurality of camera auxiliary equipment. The specific technical scheme is as follows:
the embodiment of the invention provides a time calibration method for a camera auxiliary device which is divided into auxiliary slave devices in a camera auxiliary system, wherein the camera auxiliary system also comprises a camera auxiliary device which is divided into auxiliary main devices, and the auxiliary main devices calibrate the device time in advance through a global positioning system GPS module/network time protocol NTP service, and the method comprises the following steps:
sending a calibration grant request to the secondary master device;
when receiving calibration permission information returned by the auxiliary main equipment aiming at the calibration permission request, sending a time calibration request to the auxiliary main equipment, and recording the request sending time of the time calibration request;
receiving time calibration response information sent by the auxiliary main equipment, and recording response receiving time of the time calibration response information, wherein the time calibration response information comprises request receiving time when the auxiliary main equipment receives the time calibration request and response sending time when the time calibration response information is sent;
calculating a time difference value with the auxiliary main equipment according to the request sending time, the request receiving time, the response sending time and the response receiving time;
and calibrating the current time based on the time difference.
Further, before the sending of the permission calibration request to the secondary master device, the method further includes:
sending a registration request to the secondary primary device;
and after receiving a registration success message returned by the auxiliary main equipment for the registration request, executing the step of sending a permission calibration request to the auxiliary main equipment.
Further, the calculating a time difference value with the auxiliary main device according to the request sending time, the request receiving time, the response sending time and the response receiving time includes:
calculating a difference value between the request receiving time and the request sending time as a first difference value, and a difference value between the response sending time and the response receiving time as a second difference value;
determining the time difference with the auxiliary main device based on the first difference and the second difference.
Further, the determining a time difference value with the auxiliary main device based on the first difference value and the second difference value includes:
and calculating the average value of the first difference value and the second difference value as the time difference value with the auxiliary main equipment.
Further, the calibrating the current time based on the time difference value includes:
and adding the current time and the time difference value to obtain the calibrated current time.
Further, after the sending of the request for permission to calibrate to the secondary master device, the method further includes:
and when receiving the delay calibration information returned by the auxiliary main equipment aiming at the calibration request, delaying for a preset time length, and executing the step of sending the calibration request to the auxiliary main equipment.
An embodiment of the present invention further provides a time calibration method applied to a camera auxiliary device divided into auxiliary master devices in a camera auxiliary system, where the camera auxiliary system further includes a camera auxiliary device divided into auxiliary slave devices, and the method includes:
acquiring a timestamp of a global positioning system GPS module/network time protocol NTP service so as to calibrate the current moment;
when receiving a calibration permission request sent by the auxiliary slave device, sending calibration permission information to the auxiliary slave device so that the auxiliary slave device sends a time of day calibration request;
when the time calibration request sent by the auxiliary slave equipment is received, determining the time when the time calibration request is received as a request receiving time;
and sending a time calibration response to the auxiliary slave device, wherein the time calibration response comprises the request receiving time and the response sending time of the time calibration response, so that the auxiliary slave device records the response receiving time of the time calibration response when receiving the time calibration response information, calculates a time difference value according to the request sending time, the request receiving time, the response sending time and the response receiving time, and calibrates the time of the auxiliary slave device based on the time difference value.
An embodiment of the present invention further provides a time calibration apparatus for a camera auxiliary device divided into auxiliary slave devices in a camera auxiliary system, where the camera auxiliary system further includes a camera auxiliary device divided into auxiliary master devices, and the auxiliary master devices calibrate device time in advance through a global positioning system GPS module/network time protocol NTP service, including:
a request sending module, configured to send a calibration permission request to the auxiliary master device;
the first processing module is used for sending a time calibration request to the auxiliary main equipment and recording the request sending time of the time calibration request when receiving calibration permission information returned by the auxiliary main equipment aiming at the calibration permission request;
a second processing module, configured to receive time calibration response information sent by the auxiliary master device, and record a response receiving time at which the time calibration response information is received, where the time calibration response information includes a request receiving time at which the auxiliary master device receives the time calibration request and a response sending time at which the time calibration response information is sent;
a time difference value calculating module, configured to calculate a time difference value between the auxiliary main device and the request sending time, the request receiving time, the response sending time, and the response receiving time;
and the time calibration module is used for calibrating the current time based on the time difference.
Further, the method also comprises the following steps:
a registration request sending module, configured to send a registration request to the auxiliary main device;
and the first execution module is used for calling the request sending module after receiving a registration success message returned by the auxiliary main equipment aiming at the registration request.
Further, the time difference calculation module is specifically configured to calculate a difference between the request receiving time and the request sending time as a first difference, and a difference between the response sending time and the response receiving time as a second difference, and determine the time difference with the auxiliary main device based on the first difference and the second difference.
Further, the time difference calculation module is specifically configured to calculate an average value of the first difference and the second difference, as a time difference with the auxiliary main device.
Further, the time calibration module is specifically configured to add the current time and the time difference to obtain a calibrated current time.
Further, the request sending module is further configured to, after the calibration permission request is sent to the auxiliary main device, delay for a preset duration when receiving the delay calibration information returned by the auxiliary main device for the calibration permission request, and resend the calibration permission request to the auxiliary main device.
An embodiment of the present invention further provides a time calibration apparatus applied to a camera auxiliary device divided into auxiliary master devices in a camera auxiliary system, where the camera auxiliary system further includes a camera auxiliary device divided into auxiliary slave devices, and the time calibration apparatus includes:
the time stamp acquisition module is used for acquiring a time stamp of a global positioning system GPS module/network time protocol NTP service so as to calibrate the current time;
a calibration information sending module, configured to send calibration permission information to the auxiliary slave device when receiving a calibration permission request sent by the auxiliary slave device, so that the auxiliary slave device sends a time-of-day calibration request;
the time determining module is used for determining the time when the time calibration request sent by the auxiliary slave equipment is received as the request receiving time;
and the response sending module is used for sending a time calibration response to the auxiliary slave device, wherein the time calibration response comprises the request receiving time and the response sending time of the time calibration response, so that when the auxiliary slave device receives the time calibration response information, the response receiving time of the time calibration response information is recorded, a time difference value is calculated according to the request sending time, the request receiving time, the response sending time and the response receiving time, and the time of the auxiliary slave device is calibrated based on the time difference value.
The embodiment of the invention also provides auxiliary slave equipment, which comprises a processor and a memory;
a memory for storing a computer program;
and a processor for implementing any of the above-described steps of the time alignment method applied to a camera support device divided into support slave devices in a camera support system when executing the program stored in the memory.
The embodiment of the invention also provides auxiliary main equipment, which comprises a processor and a memory;
a memory for storing a computer program;
and a processor for implementing any of the above-described steps of the time alignment method applied to the camera auxiliary device divided into the auxiliary main device in the camera auxiliary system when executing the program stored in the memory.
The present invention also provides a computer-readable storage medium, in which a computer program is stored, which, when being executed by a processor, implements any of the above-mentioned steps of the method for time alignment applied to a camera auxiliary device divided into auxiliary slave devices in a camera auxiliary system.
The present invention further provides a computer-readable storage medium, in which a computer program is stored, and the computer program, when executed by a processor, implements any of the above steps of the method for calibrating a time of day applied to a camera auxiliary device divided into auxiliary main devices in a camera auxiliary system.
Embodiments of the present invention also provide a computer program product containing instructions that, when run on a computer, cause the computer to perform any of the above-described time-of-day calibration methods applied to a camera auxiliary device divided into auxiliary slave devices in a camera auxiliary system.
Embodiments of the present invention also provide a computer program product containing instructions, which when run on a computer, cause the computer to perform any of the above-described time calibration methods applied to a camera auxiliary device divided into auxiliary main devices in a camera auxiliary system.
The invention provides a time calibration method, which is applied to camera auxiliary equipment divided into auxiliary slave equipment in a camera auxiliary system, wherein the camera auxiliary system also comprises the camera auxiliary equipment divided into auxiliary master equipment, the auxiliary master equipment calibrates the equipment time in advance through a Global Positioning System (GPS) module/Network Time Protocol (NTP), a calibration permission request is sent to the auxiliary master equipment in the scheme, when the calibration permission information returned by the auxiliary master equipment for the calibration permission request is received, the time calibration request is sent to the auxiliary master equipment, the request sending time of the time calibration request is recorded, time calibration response information sent by the auxiliary master equipment is received, and the response receiving time of the time calibration response information is recorded, wherein the time calibration response information comprises the request receiving time when the auxiliary master equipment receives the time calibration request and the response receiving time of the time calibration response information sent by the auxiliary master equipment The method comprises the steps of sending time, calculating a time difference value between the auxiliary main equipment and the camera auxiliary equipment according to the request sending time, the request receiving time, the response sending time and the response receiving time, and calibrating the current time based on the time difference value.
Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
Fig. 1 is a flowchart of a time calibration method applied to an auxiliary slave device according to an embodiment of the present invention;
FIG. 2 is a flow chart of a time alignment method applied to an auxiliary slave device according to another embodiment of the present invention;
fig. 3 is a flowchart of a time calibration method applied to an auxiliary master device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a time alignment apparatus applied to an auxiliary slave device according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a time calibration apparatus applied to an auxiliary main device according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an auxiliary slave device according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an auxiliary slave device according to an embodiment of the present invention.
Detailed Description
In order to provide an implementation scheme for keeping time consistency of camera auxiliary equipment installed on a camera, the embodiment of the invention provides a time calibration method, a time calibration device, auxiliary slave equipment and auxiliary master equipment, and the embodiment of the invention is described below with reference to the attached drawings of the specification. And the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
For ease of understanding, application scenarios of the present invention are briefly described:
in one shooting scene of the embodiment of the invention, a plurality of cameras are included, each camera shoots a stage scene through different angles, and each camera is provided with a camera auxiliary device, wherein the camera auxiliary devices can input audio signals containing time information to the cameras through audio input interfaces of the cameras in the shooting process of the cameras, so that the time information can be read from audio data of videos when the videos recorded by the cameras are processed at a later stage, and the recording time of the videos is further determined.
In order to ensure accurate time synchronization of videos captured by the cameras, the time of each camera-mounted camera auxiliary device needs to be kept consistent, so that each camera auxiliary device mounted on the camera needs to be time-calibrated before each camera mounted with the camera auxiliary device starts capturing, so as to ensure that the time information included in the audio signals output by each camera auxiliary device at the same time is the same.
When the time calibration is performed for each camera auxiliary device mounted on the camera, it is necessary to designate at least one auxiliary master device, which is mainly used to provide a reference time, among the camera auxiliary devices, and the remaining camera auxiliary devices are auxiliary slave devices, which can ensure the time consistency among the camera auxiliary devices by performing communication calibration for the auxiliary master device.
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
In one embodiment of the present invention, there is provided a time-of-day calibration method applied to a camera assistance device divided into auxiliary slave devices in a camera assistance system, as shown in fig. 1, the method including the steps of:
s101: a permission calibration request is sent to the secondary master device.
In this step, the auxiliary main device included in the camera auxiliary system may be divided in advance among the camera auxiliary devices.
The auxiliary main device may calibrate its own time in advance, and optionally, calibrate the device time through a global positioning system GPS module/network time protocol NTP service.
Illustratively, in one shooting scene, there are 3 cameras with camera auxiliary devices installed, denoted by F1, F2, and F3, respectively, F1 is divided into auxiliary master devices in advance, and F2 and F3 are divided into auxiliary slave devices before time calibration is performed.
Optionally, the auxiliary master device and the auxiliary slave device have been connected in advance, and the connection manner may include multiple manners, for example, the auxiliary master device establishes a WIFI (WIreless-Fidelity, WIreless connection) encrypted hotspot, the auxiliary slave device joins the hotspot established by the auxiliary master device, and the device-to-device connection may also be performed through a bluetooth technology.
The grant alignment request is used to request time alignment from the secondary master device, which may be a string with a specific rule agreed in advance, for example, 0x 0001.
In an embodiment, if the delayed calibration information returned by the secondary master device for the calibration request grant is received, the step S101 may be executed again after delaying for a preset time.
S102: and when receiving the calibration permission information returned by the auxiliary main equipment for the calibration permission request, sending a time calibration request to the auxiliary main equipment, and recording the request sending time of the time calibration request.
In this step, the calibration permission information returned by the auxiliary master device is received, which indicates that the auxiliary master device is currently available for time service calibration, and at this time, a time calibration request is sent to the auxiliary master device to start time calibration.
In one embodiment, when sending a time of day calibration request to the secondary master device, it is necessary to record the request sending time of the time of day calibration request currently sent to the secondary master device at the same time.
Illustratively, the current time is 12:30, and when the time calibration request is sent to the auxiliary master device, the request sending time is 12:30, which may be denoted as T1.
In one embodiment, the current Time may be obtained by a RTC (Real Time Clock) in the camera auxiliary device, and at this Time, when the Time calibration request is sent to the auxiliary main device, the Time is obtained by the RTC and recorded as the request sending Time.
S103: and receiving time calibration response information sent by the auxiliary main equipment, and recording the response receiving time of the received time calibration response information, wherein the time calibration response information comprises the request receiving time when the auxiliary main equipment receives the time calibration request and the response sending time when the time calibration response information is sent.
In this step, for convenience of understanding, the operation performed by the auxiliary master device when receiving the time alignment request transmitted in step S102 will be described first.
The auxiliary master device records the time of the currently received time calibration request as the request receiving time after receiving the time calibration request, and then the auxiliary master device needs to send time calibration response information to the auxiliary slave device, wherein the time calibration response information comprises the request receiving time and the response sending time of the current time calibration response message.
When a time calibration response message sent by the auxiliary main equipment is received, the time of currently receiving the time calibration response message is recorded as the response receiving time.
In one embodiment, as in the step S102, the time of sending the acquisition request, the auxiliary master device and the auxiliary slave device may acquire each time through an internal RTC.
Illustratively, when the auxiliary master device receives the time calibration request, the RTC inside the device is read, the time at which the time calibration request is currently received is acquired and recorded as the request receiving time T2, after a period of time, the auxiliary master device needs to transmit time calibration response information, read the RTC time, recorded as the response transmitting time T3, write the time calibration response information into T2 and T3 and transmit the time calibration response information, and when the auxiliary slave device receives the time calibration response message, the RTC time of the device content is read and recorded as the response receiving time T4.
S104: and calculating the time difference value with the auxiliary main equipment according to the request sending time, the request receiving time, the response sending time and the response receiving time.
In this step, because of the time required for communication between the auxiliary master device and the auxiliary slave device and the short duration, it does not affect the accuracy of the video time synchronization in the later period, therefore, the real time corresponding to the request sending time and the request receiving time can be the same, i.e. the time calibration request is sent and the time calibration request is received, at the same time, the sending time of the request is the time recorded by the auxiliary slave device at the time, and the request reception time is the time size of the auxiliary master at that time, therefore, the time difference between the request transmission time and the request reception time, i.e. the difference in recording time between the auxiliary master and the auxiliary slave, and similarly, the difference between the response sending time and the response receiving time is also the difference in recording time between the auxiliary master and the auxiliary slave.
In one embodiment, any one of the difference between the request transmission timing and the request reception timing and the difference between the reply transmission timing and the reply reception timing may be used as the timing difference with the auxiliary main device.
In one embodiment, the difference with the auxiliary main device may be further reduced by integrating the difference between the request transmission time and the request reception time and the difference between the response transmission time and the response reception time to determine the difference with the auxiliary main device.
Optionally, when it is required to integrate the difference between the request sending time and the request receiving time and the difference between the response sending time and the response receiving time, step S104 includes:
s1041: a difference between the request reception time and the request transmission time is calculated as a first difference, and a difference between the response transmission time and the response reception time is calculated as a second difference.
Alternatively, the first difference may be calculated according to a formula Δ T1 ═ T2-T1, where Δ T1 is the first difference, T2 is the request receiving time, and T1 is the request sending time.
Alternatively, the second difference may be calculated according to a formula Δ T2 ═ T3-T4, where Δ T2 is the second difference, T3 is the response transmission time, and T4 is the response reception time.
S1042: and determining a time difference value with the auxiliary main device based on the first difference value and the second difference value.
Optionally, the time difference with the auxiliary main device may be determined in different manners according to different usage scenarios, for example, the larger one of the first difference and the second difference may be used as the time difference with the auxiliary main device, or the smaller one may be used as the time difference with the auxiliary main device.
In one embodiment, an average of the first difference and the second difference may also be calculated as a time difference with the secondary master.
S105: and calibrating the current time based on the time difference.
In this step, the current time is calibrated in different ways according to the difference of the time difference calculation ways.
In one embodiment, when the time difference is determined by subtracting the time of the auxiliary slave device from the time of the auxiliary master device, the time difference may be added to the current time as the calibrated current time, that is, the current time is added to the time difference as the calibrated current time, for example, the embodiments provided in steps S1041 and S1042.
In one embodiment, when the time difference is determined by the secondary slave subtracting the time of the secondary master, the time difference may be subtracted on the basis of the current time as the calibrated current time.
In one embodiment, the above steps S102 to S104 may be performed multiple times, so as to obtain multiple time difference values, and then the average value is taken, so as to further precisely calibrate the current time.
In the time calibration method applied to the camera auxiliary device divided into auxiliary slave devices in the camera auxiliary system, provided by the embodiment of the invention, the time calibration request is sent to the auxiliary master device, and when the calibration permission information returned by the auxiliary master device for the calibration permission request is received, the time calibration request is sent to the auxiliary master device, the request sending time of the time calibration request is recorded, the time calibration response information sent by the auxiliary master device is received, and the response receiving time of the time calibration response information is recorded, wherein the time calibration response information comprises the request receiving time when the auxiliary master device receives the time calibration request and the response sending time when the time calibration response information is sent, and the time difference value between the time calibration response information and the auxiliary master device is calculated according to the request sending time, the request receiving time, the response sending time and the response receiving time, and calibrating the current time based on the time difference, wherein the camera auxiliary equipment serving as the auxiliary slave equipment can adjust the time of the camera auxiliary equipment serving as the auxiliary master equipment by sending a time calibration request to the camera auxiliary equipment and recording the receiving and sending time, so that the time consistency of the auxiliary slave equipment and the auxiliary master equipment is ensured, and the accuracy of time synchronization of videos shot by all cameras is ensured.
On the basis of the above embodiment, before executing step S101, as shown in fig. 2, the method may further include:
s106: a registration request is sent to the secondary primary device.
In this step, a registration request may be sent to the secondary master device in order to enable communication with the secondary master device.
In one embodiment, the registration request may include information about the auxiliary slave device and a registration key, including an auxiliary slave device IP (Internet Protocol Address), a machine number of the auxiliary slave device, a cameraman and a machine position number of the auxiliary slave device, and the like.
The auxiliary master device may determine whether the received registration key is correct, and if so, write the relevant information of the auxiliary slave device into the device table, complete registration of the auxiliary slave device, and send a registration success message to the auxiliary slave device.
In one embodiment, before the secondary master device receives the registration request, the secondary master device may perform initialization, where the initialization process may determine the relevant information of the current shooting scene through a usb disk or a manual setting, for example: date, camera number, scene number, etc.
In one embodiment, in order to ensure that each camera auxiliary device is consistent with the actual time, the auxiliary main device may obtain the current actual time through a GPS (Global Positioning System) module/NTP (network time Protocol) service in the device, so as to determine the RTC time of the auxiliary main device.
S107: after receiving the registration success message returned by the secondary master device for the registration request, step S101 is executed.
In another embodiment of the present invention, there is also provided a camera auxiliary device time calibration method divided into auxiliary main devices in a camera auxiliary system, as shown in fig. 3, the method including the steps of:
s301: and acquiring a time stamp of a global positioning system GPS module/network time protocol NTP service so as to calibrate the current moment.
In this step, in order to ensure the time accuracy of the auxiliary main device and eliminate the error of long-time operation of the RTC, the timestamp of the actual time may be acquired through the GPS module/network time protocol NTP service, and the error between the time of the auxiliary main device and the actual time may be determined based on the timestamp, so as to calibrate the current time.
S302: when receiving a calibration permission request sent by the auxiliary slave device, sending calibration permission information to the auxiliary slave device so that the auxiliary slave device sends a time of day calibration request.
In this step, the implementation steps are similar to those described in relation to steps S101 and S102, and are not described again here.
S303: when a time alignment request transmitted by the auxiliary slave device is received, the time at which the time alignment request is received is determined as a request reception time.
In this step, the implementation steps are similar to those described in step S103, and are not described again here.
S304: and sending a time calibration response to the auxiliary slave device, wherein the time calibration response comprises a request receiving time and a response sending time of the time calibration response, so that the auxiliary slave device records the response receiving time of the received time calibration response when receiving the time calibration response information, calculates a time difference value according to the request sending time, the request receiving time, the response sending time and the response receiving time, and calibrates the time of the auxiliary slave device based on the time difference value.
In this step, the implementation steps are similar to those described in relation to steps S104 and S105, and are not described again here.
In the time calibration method applied to the camera auxiliary device divided into the auxiliary master device in the camera auxiliary system, provided by the embodiment of the invention, the timestamp of the global positioning system GPS module/network time protocol NTP service is acquired to calibrate the current time, when the calibration permission request sent by the auxiliary slave device is received, the calibration permission information is sent to the auxiliary slave device so that the auxiliary slave device sends the time calibration request, and when the time calibration request sent by the auxiliary slave device is received, the time when the time calibration request is received is determined as the request receiving time, and the time calibration response is sent to the auxiliary slave device, wherein the time calibration response comprises the request receiving time and the response sending time of the time calibration response, so that the auxiliary slave device records the response receiving time when the time calibration response information is received, the camera auxiliary equipment serving as the auxiliary slave equipment can send a time calibration request to the camera auxiliary equipment serving as the auxiliary master equipment and adjust the time of the camera auxiliary equipment by the recorded receiving and sending times, so that the time consistency of the auxiliary slave equipment and the auxiliary master equipment is ensured, and the accuracy of time synchronization of videos shot by all cameras is ensured.
In one embodiment, in the above embodiments, the types of communication information between the auxiliary master device and the auxiliary slave device may include information header, type bit, data information bit, data bit, and check code bit.
The header of the communication information may indicate the task type of the information, and for example, the header is set to 0x000F to indicate that the communication is a communication information of a time synchronization task.
The type bit of the communication information may be used to indicate a specific type of the communication information, for example, the type is four bytes, the upper two bytes indicate a type of a machine to be transmitted, and the lower two bytes indicate the type, where the upper two bits are FF to indicate transmission by the auxiliary master device and 00 to indicate transmission by the auxiliary slave device.
Illustratively, 0x0001 represents a registration request sent by the secondary slave to the secondary master, and 0xFF02 represents a registration reply message returned by the secondary master to the secondary slave.
The data information bits of the communication information can represent the data size of the communication information and can also represent the data size of the data bits in the communication information;
the data bits of the communication information can be used for carrying data to be communicated.
Illustratively, when the type bit of the communication information is 0x0001, which indicates a registration request sent by the secondary slave to the secondary master, the data information bit thereof may be 512 bits, and the data bit may include: 256-bit registration key, 32-bit equipment number, 32-bit camera number, 32-bit type, 32-bit serial number, 32-bit photographer number and 96-bit reserved bit.
When the type is 0xFF02, it indicates that the auxiliary master device returns a registration reply message to the auxiliary slave device, the data information bit is indefinite length, the data is registration data including 32-bit registration status and indefinite length, when the registration is successful, i.e. the registration reply message is a registration success message, the type bit is 0xFFFF, the data bit includes UID (User Identification) temporarily allocated by the 32-bit auxiliary master device to the auxiliary slave device and a 32-bit scene number, if the auxiliary slave device fails to register, the type bit is 0x0000, and the data is data.
When the type is 0x0003, the time alignment request sent by the auxiliary slave device to the auxiliary master device is represented, and the data information bit is 32 bits and the data bit is 32-bit UID.
When the type is 0xFF04, it indicates that the auxiliary time alignment response message sent by the auxiliary master device to the slave device has 32 bits of data information and 32 bits of data information, where if the response message is 0xFFFF, it indicates that the subsequent operation can be performed, and if the response message is 0x0000, it indicates that the operation is rejected at the current time.
Based on the same inventive concept, according to the time calibration method applied to the camera auxiliary device divided into auxiliary slave devices in the camera auxiliary system provided by the embodiment of the present invention, the embodiment of the present invention also provides a time calibration apparatus applied to the camera auxiliary device divided into auxiliary slave devices in the camera auxiliary system, as shown in fig. 4, the apparatus includes:
a request sending module 401, configured to send a calibration permission request to the secondary master device;
a first processing module 402, configured to, when receiving calibration permission information returned by the auxiliary main device for the calibration permission request, send a time calibration request to the auxiliary main device, and record a request sending time of the time calibration request;
a second processing module 403, configured to receive time calibration response information sent by the auxiliary master device, and record a response receiving time at which the time calibration response information is received, where the time calibration response information includes a request receiving time at which the auxiliary master device receives the time calibration request and a response sending time at which the time calibration response information is sent;
a time difference calculation module 404, configured to calculate a time difference with the auxiliary main device according to the request sending time, the request receiving time, the response sending time, and the response receiving time;
and a time calibration module 405, configured to calibrate the current time based on the time difference.
Further, the method also comprises the following steps:
a registration request sending module 406, configured to send a registration request to the secondary main device;
the first executing module 407 is configured to invoke the request sending module after receiving a registration success message returned by the auxiliary main device for the registration request.
Further, the time difference calculation module 405 is specifically configured to calculate a difference between the request receiving time and the request sending time as a first difference, and a difference between the response sending time and the response receiving time as a second difference, and determine a time difference with the auxiliary main device based on the first difference and the second difference.
Further, the time difference calculation module 405 is specifically configured to calculate an average value of the first difference and the second difference, as the time difference with the auxiliary main device.
Further, the time calibration module 405 is specifically configured to add the current time and the time difference to obtain a calibrated current time.
Further, the method also comprises the following steps:
the request sending module 401 is further configured to, after performing sending of the calibration permission request to the auxiliary main device, delay by a preset time length when receiving the delay calibration information returned by the auxiliary main device for the calibration permission request, and resend the calibration permission request to the auxiliary main device.
Based on the same inventive concept, according to the time calibration method applied to the camera auxiliary device divided into the auxiliary main device in the camera auxiliary system provided by the embodiment of the present invention, the embodiment of the present invention also provides a time calibration apparatus applied to the camera auxiliary device divided into the auxiliary main device in the camera auxiliary system, as shown in fig. 5, the apparatus includes:
a timestamp acquiring module 501, configured to acquire a timestamp of a global positioning system GPS module/network time protocol NTP service, so as to calibrate a current time;
a calibration information sending module 502, configured to, when receiving a calibration permission request sent by an auxiliary slave device, send calibration permission information to the auxiliary slave device, so that the auxiliary slave device sends a time-of-day calibration request;
a time determination module 503, configured to determine, when receiving a time calibration request sent by an auxiliary slave device, a time at which the time calibration request is received as a request receiving time;
a response sending module 504, configured to send a time calibration response to the auxiliary slave device, where the time calibration response includes a request receiving time and a response sending time of the time calibration response, so that when the auxiliary slave device receives the time calibration response information, the auxiliary slave device records a response receiving time of the received time calibration response information, calculates a time difference according to the request sending time, the request receiving time, the response sending time, and the response receiving time, and calibrates its own time based on the time difference.
An embodiment of the present invention further provides an auxiliary slave device, as shown in fig. 6, including a processor 601 and a memory 602, where:
a memory 602 for storing a computer program;
the processor 601, when executing the program stored in the memory 602, implements the following steps:
sending a calibration grant request to the secondary master device;
when receiving calibration permission information returned by the auxiliary main equipment aiming at the calibration permission request, sending a time calibration request to the auxiliary main equipment, and recording the request sending time of the time calibration request;
receiving time calibration response information sent by the auxiliary main equipment, and recording response receiving time of the time calibration response information, wherein the time calibration response information comprises request receiving time when the auxiliary main equipment receives the time calibration request and response sending time when the time calibration response information is sent;
calculating a time difference value with the auxiliary main equipment according to the request sending time, the request receiving time, the response sending time and the response receiving time;
and calibrating the current time based on the time difference.
An embodiment of the present invention further provides an auxiliary slave device, as shown in fig. 7, including a processor 701 and a memory 702, where:
a memory 702 for storing a computer program;
the processor 701 is configured to implement the following steps when executing the program stored in the memory 702:
acquiring a timestamp of a global positioning system GPS module/network time protocol NTP service so as to calibrate the current moment;
when receiving a calibration permission request sent by the auxiliary slave device, sending calibration permission information to the auxiliary slave device so that the auxiliary slave device sends a time of day calibration request;
when the time calibration request sent by the auxiliary slave equipment is received, determining the time when the time calibration request is received as a request receiving time;
and sending a time calibration response to the auxiliary slave device, wherein the time calibration response comprises the request receiving time and the response sending time of the time calibration response, so that the auxiliary slave device records the response receiving time of the time calibration response when receiving the time calibration response information, calculates a time difference value according to the request sending time, the request receiving time, the response sending time and the response receiving time, and calibrates the time of the auxiliary slave device based on the time difference value.
The Memory may include a Random Access Memory (RAM) or a Non-Volatile Memory (NVM), such as at least one disk Memory. Optionally, the memory may also be at least one memory device located remotely from the processor.
The Processor may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component.
In a further embodiment of the present invention, a computer-readable storage medium is also provided, in which a computer program is stored, which, when being executed by a processor, carries out any of the above-mentioned steps of the time-of-day calibration method applied to a camera auxiliary device divided into auxiliary slave devices in a camera auxiliary system.
In yet another embodiment of the present invention, a computer-readable storage medium is further provided, in which a computer program is stored, which, when being executed by a processor, implements any of the above-mentioned steps of the time-of-day calibration method applied to a camera auxiliary device divided into auxiliary main devices in a camera auxiliary system.
In a further embodiment provided by the present invention, there is also provided a computer program product containing instructions which, when run on a computer, cause the computer to perform any of the above-described embodiments of the time-of-day calibration method applied to a camera assistance device divided into auxiliary slave devices in a camera assistance system.
In a further embodiment provided by the present invention, there is also provided a computer program product containing instructions which, when run on a computer, cause the computer to perform any of the above-described embodiments of the time-of-day calibration method applied to a camera auxiliary device divided into auxiliary main devices in a camera auxiliary system.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the apparatus, the auxiliary master device, the auxiliary slave device, the computer readable storage medium, and the computer program product, since they are substantially similar to the method embodiments, the description is simple, and the relevant points can be referred to the partial description of the method embodiments.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (16)
1. A time-of-day calibration method, applied to a camera auxiliary device divided into auxiliary slave devices in a camera auxiliary system, the camera auxiliary system further including a camera auxiliary device divided into auxiliary master devices, the auxiliary master devices calibrating device time in advance through a global positioning system GPS module/network time protocol NTP service, comprising:
sending a calibration grant request to the secondary master device;
when receiving calibration permission information returned by the auxiliary main equipment aiming at the calibration permission request, sending a time calibration request to the auxiliary main equipment, and recording the request sending time of the time calibration request;
receiving time calibration response information sent by the auxiliary main equipment, and recording response receiving time of the time calibration response information, wherein the time calibration response information comprises request receiving time when the auxiliary main equipment receives the time calibration request and response sending time when the time calibration response information is sent;
calculating a time difference value with the auxiliary main equipment according to the request sending time, the request receiving time, the response sending time and the response receiving time;
and calibrating the current time based on the time difference.
2. The method of claim 1, further comprising, prior to said sending a permit calibration request to said secondary master device:
sending a registration request to the secondary primary device;
and after receiving a registration success message returned by the auxiliary main equipment for the registration request, executing the step of sending a permission calibration request to the auxiliary main equipment.
3. The method according to claim 1 or 2, wherein said calculating a time difference with the secondary master device based on the request transmission time, the request reception time, the response transmission time and the response reception time comprises:
calculating a difference value between the request receiving time and the request sending time as a first difference value, and a difference value between the response sending time and the response receiving time as a second difference value;
determining the time difference with the auxiliary main device based on the first difference and the second difference.
4. The method of claim 3, wherein determining the difference in time to the secondary master device based on the first difference and the second difference comprises:
and calculating the average value of the first difference value and the second difference value as the time difference value with the auxiliary main equipment.
5. The method of claim 4, wherein calibrating the current time based on the time difference comprises:
and adding the current time and the time difference value to obtain the calibrated current time.
6. The method of claim 1, further comprising, after said sending a permit calibration request to the secondary master device:
and when receiving the delay calibration information returned by the auxiliary main equipment aiming at the calibration request, delaying for a preset time length, and executing the step of sending the calibration request to the auxiliary main equipment.
7. A time-of-day calibration method, applied to a camera auxiliary device divided into auxiliary master devices in a camera auxiliary system, the camera auxiliary system further including a camera auxiliary device divided into auxiliary slave devices, comprising:
acquiring a timestamp of a global positioning system GPS module/network time protocol NTP service so as to calibrate the current moment;
when receiving a calibration permission request sent by the auxiliary slave device, sending calibration permission information to the auxiliary slave device so that the auxiliary slave device sends a time of day calibration request;
when the time calibration request sent by the auxiliary slave equipment is received, determining the time when the time calibration request is received as a request receiving time;
and sending a time calibration response to the auxiliary slave device, wherein the time calibration response comprises the request receiving time and the response sending time of the time calibration response, so that the auxiliary slave device records the response receiving time of the time calibration response when receiving the time calibration response information, calculates a time difference value according to the request sending time, the request receiving time, the response sending time and the response receiving time, and calibrates the time of the auxiliary slave device based on the time difference value.
8. A time calibration apparatus, applied to a camera auxiliary device divided into auxiliary slave devices in a camera auxiliary system, the camera auxiliary system further including a camera auxiliary device divided into auxiliary master devices, the auxiliary master devices calibrating device time in advance through a global positioning system GPS module/network time protocol NTP service, comprising:
a request sending module, configured to send a calibration permission request to the auxiliary master device;
the first processing module is used for sending a time calibration request to the auxiliary main equipment and recording the request sending time of the time calibration request when receiving calibration permission information returned by the auxiliary main equipment aiming at the calibration permission request;
a second processing module, configured to receive time calibration response information sent by the auxiliary master device, and record a response receiving time at which the time calibration response information is received, where the time calibration response information includes a request receiving time at which the auxiliary master device receives the time calibration request and a response sending time at which the time calibration response information is sent;
a time difference value calculating module, configured to calculate a time difference value between the auxiliary main device and the request sending time, the request receiving time, the response sending time, and the response receiving time;
and the time calibration module is used for calibrating the current time based on the time difference.
9. The apparatus of claim 8, further comprising:
a registration request sending module, configured to send a registration request to the auxiliary main device;
and the first execution module is used for calling the request sending module after receiving a registration success message returned by the auxiliary main equipment aiming at the registration request.
10. The apparatus according to claim 8 or 9, wherein the time difference calculation module is specifically configured to calculate a difference between the request receiving time and the request sending time as a first difference, and a difference between the response sending time and the response receiving time as a second difference, and determine the time difference with the auxiliary master device based on the first difference and the second difference.
11. The apparatus according to claim 10, wherein the time difference calculation module is specifically configured to calculate an average of the first difference and the second difference as the time difference with the auxiliary main device.
12. The apparatus according to claim 11, wherein the time calibration module is specifically configured to add a current time to the time difference as the calibrated current time.
13. The apparatus of claim 8, wherein the request sending module is further configured to, after sending the calibration grant request to the secondary master device is executed, delay, by a preset time length, the sending of the calibration grant request to the secondary master device again when receiving the delayed calibration information returned by the secondary master device for the calibration grant request.
14. A time adjustment apparatus, applied to a camera auxiliary device divided into auxiliary master devices in a camera auxiliary system, the camera auxiliary system further including a camera auxiliary device divided into auxiliary slave devices, comprising:
the time stamp acquisition module is used for acquiring a time stamp of a global positioning system GPS module/network time protocol NTP service so as to calibrate the current time;
a calibration information sending module, configured to send calibration permission information to the auxiliary slave device when receiving a calibration permission request sent by the auxiliary slave device, so that the auxiliary slave device sends a time-of-day calibration request;
the time determining module is used for determining the time when the time calibration request sent by the auxiliary slave equipment is received as the request receiving time;
and the response sending module is used for sending a time calibration response to the auxiliary slave device, wherein the time calibration response comprises the request receiving time and the response sending time of the time calibration response, so that when the auxiliary slave device receives the time calibration response information, the response receiving time of the time calibration response information is recorded, a time difference value is calculated according to the request sending time, the request receiving time, the response sending time and the response receiving time, and the time of the auxiliary slave device is calibrated based on the time difference value.
15. An auxiliary slave device comprising a processor and a memory;
a memory for storing a computer program;
a processor for implementing the method steps of any of claims 1-6 when executing a program stored in the memory.
16. A secondary master device comprising a processor and a memory;
a memory for storing a computer program;
a processor for implementing the method steps of claim 7 when executing a program stored in the memory.
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