KR20080006902A - Systme and method for executiing synchronization of output data created in asynchronous dual camera - Google Patents

Abstract

A system, a method and a recording medium for performing synchronization of output data generated in an asynchronous dual camera are provided to perform synchronization by buffering the output data of the dual camera through two inner memories each assigned to the dual camera, thereby implementing a three dimensional video system even when vertical sync signals, each transmitted from two cameras of the dual camera, are inconsistent with each other. First and second cameras(301,302) respectively generate output data. Two inner memories(303,304) respectively buffer the output data. A control block(306) synchronizes the output data according to vertical sync signals each transmitted from the first and second cameras. If the number of clocks between the vertical sync signals is larger than capacity of the inner memories, an external memory(305) stores the output data. The control block synchronizes the output data by controlling the inner memories and the external memory according to whether the vertical sync signals are consistent or not.

Description

SYSTEM AND METHOD FOR SYNCHRONIZING OUTPUT DATA GENERATED BY AN Asynchronous Binocular Camera {SYSTEME AND METHOD FOR EXECUTIING SYNCHRONIZATION OF OUTPUT DATA CREATED IN ASYNCHRONOUS DUAL CAMERA}

1 is a view showing an overview of a binocular stereoscopic imaging system in the prior art.

2 is a diagram illustrating an overview of a binocular stereoscopic imaging system according to a first embodiment of the present invention.

FIG. 3 is a block diagram illustrating an internal configuration of a binocular stereoscopic image system for synchronizing output data according to the first embodiment of the present invention.

4 is a block diagram for explaining an internal configuration of an apparatus for providing synchronization between a plurality of output data according to the second embodiment of the present invention.

5 is a flowchart illustrating a method of synchronizing output data in a binocular stereoscopic image system according to a third embodiment of the present invention.

6 is a flowchart illustrating a method of providing synchronization between a plurality of output data according to the fourth embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

300: binocular stereoscopic imaging system

301: first camera

302: second camera

303, 304: internal memory

305: external memory

306: control block

The present invention relates to a system and method for performing synchronization of output data generated in an asynchronous binocular camera. More particularly, when a vertical sync signal received from the binocular camera does not coincide with each other, the binocular camera A binocular stereoscopic imaging system and method for performing synchronization of the output data by buffering the output data of the binocular camera through two internal memories or one external memory respectively allocated to.

Three-dimensional image is more realistic than two-dimensional image, and it is being used more and more as the next generation image system in the multimedia era.It is first implemented as 3DTV and stereoscopic movie, and also used for remote control image, training simulation, It is also usefully applied to stereoscopic image communication.

The most basic way to reproduce these three-dimensional stereoscopic images is to obtain images using two cameras, like our two eyes, and show each image to both eyes. This is called binocular or stereo stereoscopic image. Such a stereoscopic camera is called a binocular camera or a stereoscopic camera.

In general, a binocular camera using a CMOS metal (Complementary Metal Oxide Semiconductor camera) or a CCD (Charge-Coupled Device camera) used in a mobile phone is largely a camera whose vertical synchronization signal always has a constant period and the vertical synchronization signal is applied to the ambient brightness. There are two kinds that change.

The papers and patents published to date regarding such a binocular camera system have not considered the case where the vertical synchronization signal of the two cameras is variable.

1 is a view showing an overview of a binocular stereoscopic imaging system in the prior art. As shown in FIG. 1, when the vertical synchronization signal 103 transmitted from the first camera 101 and the second camera 102 of the binocular stereoscopic imaging system 100 is always constant, the controller 104 controls the first camera. By properly matching the initialization signals of the 101 and the second camera 102 and precisely decorating the circuit, in practice, the vertical synchronization signal 103 of the first camera 101 and the second camera 102 can be adjusted to match. have. Therefore, in this case, when the output data 105 and 106 of the first camera 101 and the second camera 102 are properly synthesized or mixed through the mixer 107, a desired stereoscopic image is always created to display a display device 108 such as an LCD. Since it can be provided through, the binocular stereoscopic imaging system 100 can be implemented without difficulty.

However, when a camera whose vertical synchronizing signal changes according to ambient brightness is used in a binocular stereoscopic imaging system, it is impossible to predict at all which vertical synchronizing signal of the camera will be received first. That is, the order of transmission of the vertical synchronization signal between the two cameras continues to change. When binocular stereoscopic image system is composed of these two cameras, the output data of the reference camera can be seen well, but for the output data of other cameras that are not synchronized, the vertical blank section appears in the middle of the image. Synthesizing or mixing the data causes a problem that the desired image cannot be obtained at all.

The present invention proposes a new technique relating to a system and method for performing synchronization of output data generated in an asynchronous binocular camera to solve the problems of the prior art as described above.

The present invention provides a vertical sync signal transmitted from two cameras of the binocular camera by providing synchronization by buffering output data of the binocular camera through two internal memories or one external memory respectively allocated to the binocular camera. ) Is to implement a stereoscopic image system even if the () does not coincide with each other.

Another object of the present invention is to implement the stereoscopic image system even when the vertical synchronization signal between the two cameras do not match, the overall product development through the implementation of the stereoscopic image system using a more diverse and inexpensive CMOS and CCD camera Lower cost and apply to more diverse applications.

Still another object of the present invention is to perform synchronization of the output data even through an asynchronous signal in a device requiring synchronization of the output data.

In order to achieve the above object and to solve the above-mentioned problems of the prior art, a binocular stereoscopic image system for synchronizing the output data according to an embodiment of the present invention, the first camera for generating the output data and each; A second camera, two internal memories buffering the output data, and a control block for synchronizing the output data according to a vertical sync signal transmitted from the first camera and the second camera, respectively. .

According to one aspect of the invention, the binocular stereoscopic image system further comprises an external memory for storing the output data when the number of clocks between the vertical synchronization signal is greater than the capacity of the internal memory, the control block is the vertical The output data may be synchronized by controlling the internal memory and the external memory according to whether the synchronization signal matches.

According to another aspect of the present invention, when the vertical synchronization signal matches, the control block may output the output data through each output port without passing through the internal memory and the external memory.

According to still another aspect of the present invention, the control block outputs each of the output data by synchronizing the output data using an internal memory or an external memory according to the number of clocks between the vertical synchronization signals when the vertical synchronization signals do not match. You can output through the port.

According to another embodiment of the present invention, an apparatus for providing synchronization between a plurality of output data, the receiving unit for receiving the asynchronous signal and the output data from a plurality of output data generating device and the output data based on the asynchronous signal An output data processor for processing storage and output.

According to another embodiment of the present invention, the method for synchronizing the output data in the binocular stereoscopic imaging system, generating the output data in the first camera and the second camera, the output using two internal memories Buffering data, respectively, and synchronizing the output data according to a vertical synchronization signal transmitted from the first camera and the second camera, respectively, in a control block.

Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

2 is a diagram illustrating an overview of a binocular stereoscopic imaging system according to a first embodiment of the present invention.

In the binocular stereoscopic imaging system 200 capable of generating a desired stereoscopic image even with the variable vertical synchronizing signals 201 and 202, as shown in FIG. 2, the vertical synchronizing signal 201 is first performed by the first camera 203. When sent and reached, the output data 205 of the first camera 203 is stored in the internal memory 206 allocated to the first camera 203 through the control block 204.

At this time, when the number of clocks between the vertical synchronization signal 201 of the first camera 203 and the vertical synchronization signal 202 of the second camera 208 exceeds the capacity of the internal memory 206, output data 205. ) May be stored in the external memory 207 without being stored in the internal memory 206.

In order for a computer's CPU or digital circuit to operate at a constant speed, electrical pulses must be supplied at regular intervals. In other words, all parts of the computer, including the CPU, operate on a specific signal, which is the clock.

The interval between one signal and the next is usually measured in one unit, and the clock speed is usually expressed in units of Hz, which indicates how many signals per second. At this time, one operation per second is called 1Hz. For example, 75 MHz means that it generates 0 and 1 digital signals in 75 million cycles per second.

That is, when the number of clocks between the vertical synchronization signals 202 exceeds the capacity of the internal memory 206, the output data 205 generated for a predetermined time through the number of digital signals generated for one second through the number of clocks. 208 may be determined, and the capacity may exceed the capacity of the internal memory 206 during the predetermined time.

In this case, the external memory 207 may have a size capable of storing all the entire frames of either the output data 205 generated by the first camera 203 or the output data 209 generated by the second camera 208. It can be designed to have.

The vertical synchronization signal 202 stored in the internal memory 206 or the external memory 207 and then transmitted by the second camera 208 is first output data 205 for the vertical synchronization signal 201 received. Is received, the control block 204 extracts the output data 205 stored in the internal memory 206 or the external memory 207 and synchronizes with the output data 209 of the second camera 208, respectively. By outputting through the output port, the synchronized output data 205 and 209 can be obtained even when the vertical synchronization signals 201 and 202 vary.

In addition, even when the vertical synchronization signal 202 of the second camera 208 is transmitted first, the output data 209 is stored in the internal memory 210 or the external memory 207 and the vertical direction of the first camera 207 is maintained. By outputting the output data 205 and 209 together when the synchronization signal 201 is received, synchronization between the output data 205 and 209 can be performed.

FIG. 3 is a block diagram illustrating an internal configuration of a binocular stereoscopic image system for synchronizing output data according to the first embodiment of the present invention. As shown in FIG. 3, the binocular stereoscopic imaging system 300 includes a first camera 301 and a second camera 302 which respectively generate output data based on the input image, and two buffering the output data. Clocks between the two internal memories 303 and 304, the vertical synchronizing signal 201 of the first camera 203 and the vertical synchronizing signal 202 of the second camera 208, and the capacity of the internal memory 303 and 304. If larger, the control block 306 for synchronizing the output data according to the external memory 305 storing the output data and the vertical synchronization signal transmitted from the first camera 301 and the second camera 302, respectively. It may include.

In this case, the control block 306 may control the internal memory 303 and 304 and the external memory 305 to synchronize the output data according to whether the vertical synchronization signal matches.

That is, the control block 306 receives the vertical synchronizing signal transmitted from the first camera 301 and the second camera 302, and checks whether the vertical synchronizing signal is matched. Since it is already synchronized, the output data can be output directly through each output port.

In addition, when the vertical synchronization signal does not match, the output data of the vertical synchronization signal received first is stored in the internal memory 303 or 304 or the external memory 305 according to the number of clocks between the vertical synchronization signals, and the second When the vertical synchronization signal is received, the output data of the first camera 301 and the second camera 302 may be simultaneously output through the respective output ports to perform synchronization between the output data.

In this case, the control block 306 may determine the capacity of the output data through the number of clocks, and when the number of clocks is less than or equal to the capacity of the internal memories 303 and 304, the first camera which first transmits the vertical synchronization signal. The output data of the 301 may be stored in the internal memory 303, and when the number of clocks exceeds the capacity of the internal memory 303, output data of the first camera 301 that first transmits the vertical synchronization signal may be output. It may be stored in the external memory 305.

In this case, when the vertical synchronization signal of the second camera 302 is transmitted, the synchronization between the output data is performed by extracting output data of the first camera 301 from the internal memory 303 or the external memory 305 to the second camera. It is provided by synchronizing with the output data of 302 and outputting it together.

If the vertical synchronizing signal transmitted from the second camera 302 is received before the vertical synchronizing signal transmitted from the first camera 301, output data of the second camera 302 may be output to the internal memory 304 or the external memory. 305 and when the vertical synchronization signal of the first camera 301 is received, the output data is extracted from the internal memory 304 or the external memory 305 and synchronized with the output data of the first camera 301. You can print

When the vertical sync signals transmitted from the two cameras of the binocular camera do not coincide with each other by buffering the output data of the binocular camera through the two internal memories allocated to the binocular camera as described above. Even stereoscopic image system can be implemented.

In addition, even when the vertical synchronization signal between the two cameras do not match, it is possible to implement the three-dimensional image system to lower the overall product development cost through the implementation of the three-dimensional image system using a variety of cheaper CMOS and CCD cameras, It can be applied to more various applications.

4 is a block diagram for explaining an internal configuration of an apparatus for providing synchronization between a plurality of output data according to the second embodiment of the present invention. As shown in FIG. 4, the synchronization providing apparatus 400 may include a receiver 410 and an output data processor 420.

The receiver 410 receives the asynchronous signal and the output data from a plurality of output data generating apparatus. In this case, the asynchronous signal may be received by the synchronization providing device 400 at different points in time for each output data generating device, which may mean that the output data is received by the synchronization providing device 400 at different points in time. .

The output data processor 420 processes the storage and output of the output data based on the asynchronous signal. In this case, the output data processor 420 may include a match check unit 421, an output data storage unit 422, and a data synchronization unit 423.

The coincidence checker 421 determines whether the asynchronous signals match. Such agreement between the asynchronous signals may be a criterion for determining whether the reception time of the output data matches.

If the asynchronous signals do not coincide with each other, the output data storage unit 422 stores the output data in an internal memory allocated for each output data generating device. In this case, the output data storage unit 422 may determine the capacity of the output data based on the number of clocks between the asynchronous signals, and if the capacity of the output data exceeds the capacity of the internal memory, The output data may be stored and output in an external memory designed to accommodate all of the capacities.

The data synchronizer 423 simultaneously outputs the output data. In this case, when the asynchronous signals coincide with each other, the output data can be directly output through the respective output ports because the output data is already synchronized.

When the asynchronous signals do not coincide with each other, the output data of the asynchronous signal is stored in the internal memory allocated for each output data generating device, and the output data stored in the internal memory after the last asynchronous signal is received. Can be output through the respective output port at the same time to provide synchronization between the output data.

As such, the output data may be synchronized through an asynchronous signal in a device requiring synchronization of the output data.

5 is a flowchart illustrating a method of synchronizing output data in a binocular stereoscopic image system according to a third embodiment of the present invention.

In step S510, the binocular stereoscopic imaging system generates output data through the first camera and the second camera. The output data may be transmitted to a control block along with a variable vertical synchronization signal in the binocular stereoscopic imaging system using an asynchronous binocular camera.

In step S520, the binocular stereoscopic imaging system buffers the output data using two internal memories. The internal memory is allocated to the first camera and the second camera, respectively, and may temporarily buffer the output data.

In step S530, the binocular stereoscopic image system synchronizes the output data according to a vertical synchronization signal transmitted from the first camera and the second camera, respectively, in a control block. In this case, as shown in FIG. 5, step S530 may include steps S531 to S538.

In operation S531, the binocular stereoscopic image system determines whether the vertical synchronization signals match, and performs the operation S532 when the vertical synchronization signals do not coincide with each other, and performs the operation S536 when they coincide with each other. Perform.

In step S532, the binocular stereoscopic image system performs step S533 when the capacity of the output data is less than or equal to the capacity of the internal memory, and if the capacity of the output data exceeds the capacity of the internal memory (step S532). S537) is performed.

In operation S533, when the capacity of the output data is less than or equal to the capacity of the internal memory, the binocular stereoscopic image system stores output data of the first camera that first transmits the vertical synchronization signal in the internal memory.

In step S534, the binocular stereoscopic image system checks whether a vertical synchronization signal is transmitted from the second camera, and performs step S535 when the vertical synchronization signal is transmitted, and waits when the vertical synchronization signal is not transmitted.

In operation S535, when the vertical synchronization signal of the second camera is transmitted, the binocular stereoscopic imaging system extracts output data of the first camera from the internal memory and simultaneously outputs the output data of the second camera. Output through the output port. That is, by first storing output data associated with the vertical synchronization signal received in the internal memory, and then receiving the vertical synchronization signal, the output data is extracted from the internal memory and output together with the output data associated with the vertical synchronization signal. Synchronization between the output data may be performed.

In step S536, when the vertical synchronization signal matches, the binocular stereoscopic imaging system simultaneously outputs the output data through the respective output ports because the output data of the first camera and the second camera are already synchronized. Output

In step S537, the binocular stereoscopic image system stores the output data of the first camera that first transmits the vertical synchronization signal in the external memory when the capacity of the output data exceeds the capacity of the internal memory. .

In operation S538, when the vertical synchronization signal of the second camera is transmitted, the binocular stereoscopic imaging system extracts output data of the first camera from the external memory and simultaneously outputs the output data of the second camera. Output through the output port.

The synchronized and simultaneously output data may be synthesized or mixed through a mixer to generate a desired stereoscopic image.

That is, the vertical sync signals transmitted from the two cameras of the binocular camera do not coincide with each other by buffering the output data of the binocular camera through the two internal memories allocated to the binocular camera. If not, the stereoscopic image system can be implemented.

In addition, even when the vertical synchronization signal between the two cameras do not match, it is possible to implement the three-dimensional image system to lower the overall product development cost through the implementation of the three-dimensional image system using a variety of cheaper CMOS and CCD cameras, It can be applied to more various applications.

6 is a flowchart illustrating a method of providing synchronization between a plurality of output data according to the fourth embodiment of the present invention.

In operation S610, the synchronization providing device that provides synchronization between the plurality of output data receives the asynchronous signal and the output data from the plurality of output data generating devices. In this case, the asynchronous signal may be a signal transmitted to the synchronization providing device for each of a plurality of output data generating devices for generating the output data.

In operation S620, the synchronization providing apparatus processes the storage and output of the output data based on the asynchronous signal. In this case, as shown in FIG. 6, step S620 may include steps S621 to S625.

In operation S621, the synchronization providing apparatus may determine whether the asynchronous signals match and perform a step S622 when they do not match, and perform a step S625 when they match. In this case, whether or not the asynchronous signal coincides may be a criterion for determining whether or not the output time points coincide.

In operation S622, when the asynchronous signals do not coincide with each other, the synchronization providing apparatus stores the output data of the asynchronous signal in an internal memory allocated to each output data generating apparatus.

In step S623, the synchronization providing apparatus checks whether the last asynchronous signal has been received, and if so, performs step S624, and if not, waits. That is, the synchronization providing apparatus stores the output data in the internal memory until the output data is received from all the output data generating apparatuses, and performs the step S624 after the last output data is received.

In step S624, the synchronization providing device outputs the output data stored in the internal memory and the output data associated with the asynchronous signal through the respective output port at the same time after the last asynchronous signal is received. As shown in steps S623 and S624, when the output data is received together with the asynchronous signal by the output data generating device, the output data is stored in the internal memory allocated for each output data and the last output data is received. By outputting all output data together with, it is possible to provide synchronization between the output data.

In this case, the output timing of the output data and the last received output data stored in the internal memory may be determined by the asynchronous signal.

As such, by using the internal memory appropriately according to the form of the vertical synchronization signal between the two cameras even through an asynchronous signal in a device requiring output data synchronization, and by determining the output time of the data buffered in the internal memory by itself. Synchronization of the output data may be performed.

In step S625, the synchronization providing device outputs the output data through each output port when the asynchronous signals coincide with each other.

Embodiments according to the present invention can be implemented in the form of program instructions that can be executed by various computer means can be recorded on a computer readable medium. The computer readable medium may include a program command, an output data file, an output data structure, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. The medium may be a transmission medium such as an optical or metal wire, a waveguide, or the like including a carrier wave for transmitting a signal specifying a program command, an output data structure, or the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

In the present invention as described above has been described by the specific embodiments, such as specific components and limited embodiments and drawings, but this is provided to help a more general understanding of the present invention, the present invention is not limited to the above embodiments. For those skilled in the art, various modifications and variations are possible from these descriptions.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and all the things that are equivalent to or equivalent to the claims as well as the following claims will belong to the scope of the present invention. .

According to the present invention, the vertical sync signals transmitted from the two cameras of the binocular camera coincide with each other by providing synchronization by buffering the output data of the binocular camera through two internal memories respectively allocated to the binocular camera. If not, a stereoscopic imaging system can be implemented.

According to the present invention, it is possible to implement the stereoscopic image system even when the vertical synchronization signals between the two cameras do not coincide, and thus the overall product development cost through the implementation of the stereoscopic image system using more diverse and inexpensive CMOS and CCD cameras. Can be applied to more diverse applications.

According to the present invention, the synchronization of the output data can be performed through an asynchronous signal in a device requiring synchronization of the output data.

Claims (21)

In the binocular stereoscopic imaging system for synchronizing output data, A first camera and a second camera respectively generating output data; Two internal memories each buffering the output data; And A control block for synchronizing the output data according to a vertical sync signal transmitted from the first camera and the second camera, respectively A binocular stereoscopic imaging system comprising a. The method of claim 1, If the number of clocks between the vertical synchronization signal is larger than the capacity of the internal memory, further comprising an external memory for storing the output data, And the control block controls the internal memory and the external memory to synchronize the output data according to whether the vertical synchronization signal matches. The method of claim 2, And the control block outputs the output data through the respective output ports without passing through the internal memory and the external memory when the vertical synchronization signals coincide with each other. The method of claim 2, The control block, when the vertical synchronizing signal does not match, according to the number of clocks between the vertical synchronizing signal using the internal memory or an external memory to synchronize the output data and output through each output port, characterized in that Binocular stereoscopic imaging system. The method of claim 4, wherein The control block, when the number of clocks between the vertical synchronization signal is less than the capacity of the internal memory, binocular stereoscopic image, characterized in that for storing the output data of the first camera that sends the vertical synchronization signal first to the internal memory system. The method of claim 5, The control block extracts output data of the first camera from the internal memory when the vertical synchronization signal of the second camera is transmitted, and outputs the same together with the output data of the second camera. Stereoscopic imaging system. The method of claim 4, wherein And the control block stores output data of the first camera, which first transmits the vertical synchronization signal, in the external memory when the number of clocks between the vertical synchronization signals exceeds the capacity of the internal memory. Stereoscopic imaging system. The method of claim 7, wherein The control block extracts the output data of the first camera from the external memory when the vertical synchronization signal of the second camera is transmitted, and outputs the synchronized data with the output data of the second camera in synchronization. Imaging system. An apparatus for providing synchronization between a plurality of output data, A receiver which receives the asynchronous signal and the output data from a plurality of output data generating devices; And An output data processing unit for storing and outputting the output data based on the asynchronous signal Synchronization providing apparatus comprising a. The method of claim 9, The output data processing unit, A match check unit for checking whether the asynchronous signals match each other; An output data storage unit for storing the output data in an internal memory allocated to each output data generating device when the asynchronous signals do not coincide with each other; And A data synchronization unit for simultaneously outputting the output data Synchronization providing apparatus comprising a. The method of claim 10, And the data synchronization unit simultaneously outputs the output data through each output port when the asynchronous signals coincide with each other. The method of claim 10, The data synchronization unit stores the output data of the asynchronous signal in an internal memory allocated to each output data generating device when the asynchronous signals do not coincide with each other, and the output stored in the internal memory after the last asynchronous signal is received. And outputting data through each output port at the same time to provide synchronization between the output data. The method of claim 10, The output data storage unit may determine the capacity of the output data based on the number of clocks between the asynchronous signals, and if the capacity of the output data exceeds the capacity of the internal memory, the output data storage unit may accommodate all of the capacity of the output data. And store the output data in an external memory designed to be output. A method for synchronizing output data in a binocular stereoscopic imaging system, Generating output data at the first camera and the second camera; Buffering the output data using two internal memories, respectively; And Synchronizing the output data according to a vertical synchronization signal transmitted from each of the first camera and the second camera in a control block; Synchronization performing method comprising a. The method of claim 14, Synchronizing the output data, Determining whether the vertical synchronization signal matches; Determining the capacity of the output data through the number of clocks between the vertical synchronization signals when the vertical synchronization signals do not match; If the capacity of the output data is less than or equal to the capacity of the internal memory, storing output data of the first camera that first transmits the vertical synchronization signal in the internal memory; And When the vertical synchronizing signal of the second camera is transmitted, extracting output data of the first camera from the internal memory and outputting the output data through the respective output ports simultaneously with the output data of the second camera Synchronization performing method comprising a. The method of claim 15, Synchronizing the output data, If the capacity of the output data exceeds the capacity of the internal memory, storing output data of the first camera that first transmits the vertical synchronization signal in the external memory; And When the vertical synchronization signal of the second camera is transmitted, extracting output data of the first camera from the external memory and outputting the output data through the respective output ports simultaneously with the output data of the second camera; The method of performing synchronization, further comprising. The method of claim 15, Synchronizing the output data, Determining whether the vertical synchronization signal matches; And Simultaneously outputting the output data through each output port when the vertical synchronization signals match Synchronization performing method comprising a. A method of providing synchronization between a plurality of output data, the method comprising: Receiving the asynchronous signal and the output data from a plurality of output data generating devices; And Processing the storage and output of the output data based on the asynchronous signal Synchronization providing method comprising a. The method of claim 18, The step of processing the storage and output of the output data based on the asynchronous signal, Determining whether the asynchronous signals match each other; If the asynchronous signals do not coincide with each other, storing the output data of the asynchronous signal in an internal memory allocated for each output data generating device; And  Outputting through the respective output ports the output data associated with the asynchronous signal and the output data stored in the internal memory after the last asynchronous signal has been received Synchronization providing method comprising a. The method of claim 18, The step of processing the storage and output of the output data based on the asynchronous signal, Determining whether the asynchronous signals match each other; And If the asynchronous signals coincide with each other, outputting the output data through each output port Synchronization providing method comprising a. A computer-readable recording medium in which a program for executing the method of any one of claims 14 to 20 is recorded.

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