US20170201558A1 - Method of managing a network and image obtaining apparatus - Google Patents
Method of managing a network and image obtaining apparatus Download PDFInfo
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- US20170201558A1 US20170201558A1 US15/398,205 US201715398205A US2017201558A1 US 20170201558 A1 US20170201558 A1 US 20170201558A1 US 201715398205 A US201715398205 A US 201715398205A US 2017201558 A1 US2017201558 A1 US 2017201558A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
- H04L65/611—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for multicast or broadcast
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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- H04L65/4076—
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- H04L65/607—
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/70—Media network packetisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
Definitions
- Exemplary embodiments of the present invention relate to a method of managing a network and an image obtaining apparatus.
- Image obtaining apparatuses are currently being installed in many locations, and technologies of recording, storing, and transmitting images obtained by the image obtaining apparatuses are under constant development.
- multi-channel monitors that monitor observation target regions by receiving images from a plurality of cameras are being actively developed. Monitoring cameras included in such multi-channel monitors are connected to the same network to transmit an image obtained by each image obtaining apparatus.
- Exemplary embodiments of the invention include a method of managing a network that enables efficient use of a network by distributing points of time when a plurality of image obtaining apparatuses transmit I-frames.
- Exemplary embodiments of the invention also include a method of managing a network and an image obtaining apparatus enabling a network to be managed through only the image obtaining apparatus without a separate managing subject.
- Exemplary embodiments invention also include a method of managing a network and an image obtaining apparatus capable of preventing deterioration of a certain image obtaining apparatus by continuously updating a managing subject.
- An exemplary embodiment of the invention discloses a method of managing a network performed by a first terminal, the method including: broadcasting a first packet to a network; receiving at least one second packet transmitted by at least one second terminal on the network in response to the first packet; updating a master terminal in the network and the first packet based on the at least one second packet; and broadcasting the updated first packet to the network.
- the updating of the master terminal and the first packet may include: setting the first terminal as the master terminal; and initializing the first packet based on information of the first terminal.
- the updating of the master terminal and the first packet includes: setting the first terminal as the master terminal; and updating the first packet based on at least one of information of the first terminal and the at least one second packet.
- the first terminal and the at least one second terminal may each be an image obtaining apparatus.
- the first packet may include a channel of the first terminal, a channel of each of the at least one second terminal, and a time slot
- the updating of the first packet may include: determining the channel of each of the at least one second terminal based on the at least one second packet; assigning the channel of the first terminal based on the at least one second packet; and updating the time slot, in which an image transmitting point of time of the at least one second terminal that transmitted the at least one second packet and an image transmitting point of time of the first terminal are assigned according to a pre-set method, based on the at least one second packet.
- the pre-set method may include setting the image transmitting points of time such that time intervals of transmitting I-frames of images obtained by the first terminal and the at least one second terminal are largest.
- the method may further include, after the broadcasting of the updated first packet to the network: receiving at least one third packet transmitted by the at least one second terminal on the network in response to the updated first packet; and determining a malfunction of the at least one second terminal based on the at least one third packet.
- the first packet may include at least one of a channel of the first terminal, a channel of each of the at least one second terminal, a time slot in which an image transmitting point of time of the at least one second terminal and an image transmitting point of time of the first terminal are assigned according to a pre-set method, and a point of time when the master terminal is updated to the first terminal.
- the at least one second packet may include a channel of each of the at least one second terminal and a time slot in which an image transmitting point of time of the at least one second terminal and an image transmitting point of time of the first terminal are assigned according to a pre-set method.
- An exemplary embodiment of the invention also discloses a method of managing a network performed by a second terminal including: receiving a first packet broadcast by a first terminal through a network; updating a time slot based on the received first packet; and transmitting, to the first terminal, a second packet including at least one of the updated time slot and a channel of the second terminal.
- the updating of the time slot may include, when a time slot included in the first packet is different from a current time slot of the second terminal, updating the current time slot of the second terminal to the time slot included in the first packet.
- the method may further include: determining whether a master terminal satisfies a master terminal changing condition; when it is determined that the master terminal satisfies the master terminal changing condition, transmitting a fourth packet to the master terminal; updating the master terminal to the second terminal; updating the first packet based on information of the second terminal; and broadcasting the updated first packet to the network.
- An exemplary embodiment of the invention also discloses a first image obtaining apparatus including a controller configured to: broadcast a first packet to a network; receive at least one second packet transmitted by at least one second image obtaining apparatus on the network in response to the first packet; update a master terminal in the network and the first packet based on the at least one second packet; and broadcast the updated first packet to the network.
- the controller may be further configured to, when the at least one second packet is not received within a pre-set time interval after the first packet was broadcast: set the first image obtaining apparatus as the master terminal; and initialize the first packet based on information of the first image obtaining apparatus.
- the controller may be further configured to, when the at least one second packet is received: set the first image obtaining apparatus as the master terminal; and update the first packet based on at least one of information of the first image obtaining apparatus and the at least one second packet.
- the first packet may include a channel of the first image obtaining apparatus, a channel of each of the at least one second image obtaining apparatus, and a time slot
- the controller may be further configured to: determine a channel of each of the at least one second image obtaining apparatus based on the at least one second packet; assign the channel of the first image obtaining apparatus based on the at least one second packet; and updating the time slot in which an image transmitting point of time of the at least one second image obtaining apparatus that transmitted the at least one second packet and an image transmitting point of time of the first image obtaining apparatus are assigned according to a pre-set method, based on the at least one second packet.
- the pre-set method may include assigning the image transmitting points of time such that time intervals of transmitting I-frames of images obtained by the first image obtaining apparatus and the at least one second image obtaining apparatus are largest.
- the controller may be further configured to: receive at least one third packet transmitted by the at least one second image obtaining apparatus on the network in response to the updated first packet; and determine a malfunction of the at least one second image obtaining apparatus based on the at least one third packet.
- An exemplary embodiment of the invention also discloses a second image obtaining apparatus including a controller configured to: receive a first packet broadcast by a first image obtaining apparatus through a network; update a time slot based on the received first packet; and transmit a second packet including at least one of the updated time slot and a channel of the second image obtaining apparatus to the first image obtaining apparatus.
- the controller may be further configured to, when a time slot included in the first packet is different from a current time slot of the second image obtaining apparatus, updating the current time slot of the second image obtaining apparatus to the time slot included in the first packet.
- the controller may be further configured to: determine whether a master terminal satisfies a master terminal changing condition; when it is determined that the master terminal satisfies the master terminal changing condition, transmit a fourth packet to the master terminal; update the master terminal to the second image obtaining apparatus; update the first packet based on information of the second image obtaining apparatus; and broadcast the updated first packet to the network.
- FIG. 1 is a schematic diagram of a network management system according to an exemplary embodiment of the invention.
- FIG. 2 is a block diagram of a terminal according to an exemplary embodiment of the invention.
- FIG. 3A is a diagram for describing operations of a first terminal when the first terminal is a terminal initially connected to a network, according to an exemplary embodiment of the invention.
- FIG. 3B is a diagram for describing operations of a first terminal when the first terminal is not a terminal initially connected to a network, according to an exemplary embodiment of the invention.
- FIG. 4 is a diagram for describing a method of assigning, by a controller, a channel of a first terminal, according to an exemplary embodiment of the invention.
- FIG. 5 is a diagram for describing a method of updating, by a controller, a time slot, according to an exemplary embodiment of the invention.
- FIG. 6 and FIG. 7 are flowcharts of a network managing method performed by a controller, according to an exemplary embodiment of the invention.
- FIG. 8 is a flowchart of a network managing method performed by a controller of a second terminal, according to an exemplary embodiment of the invention.
- the term “and/or” includes any and all combinations of one or more of the associated listed items. Expressions such as “at least one of,” when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list.
- the present disclosure may be described in terms of functional block components and various processing steps. Such functional blocks may be realized by any number of hardware and/or software components configured to perform the specified functions. For example, the present disclosure may employ various integrated circuit components, e.g., memory elements, processing elements, logic elements, look-up tables, and the like, which may carry out a variety of functions under the control of one or more microprocessors or other control devices. Similarly, where the elements of the present disclosure are implemented using software programming or software elements the disclosure may be implemented with any programming or scripting language such as C, C++, Java, assembler, or the like, with the various algorithms being implemented with any combination of data structures, objects, processes, routines or other programming elements. Functional aspects may be implemented in algorithms that execute on one or more processors.
- FIG. 1 is a schematic diagram of a network management system according to an exemplary embodiment of the invention.
- the network management system may include at least one terminal, for example, second terminals 100 A and 100 B, and an external apparatus 200 .
- the external apparatus 200 may receive multimedia objects, such as images or sound, from the second terminals 100 A and 100 B through a network, and store and/or display the multimedia object.
- multimedia objects such as images or sound
- the external apparatus 200 may be any one of various units for storing and then re-providing information handled by an electronic communication device.
- the external apparatus 200 may be one of a video management system (VMS), a central management system (CMS), a network video recorder (NVR), and a digital video recorder (DVR).
- the external apparatus 200 may be a personal computer (PC) or a portable terminal.
- the external apparatus 200 is not limited thereto, and may be any apparatus as long as it receives multimedia objects from the second terminals 100 A and 100 B through the network, and displays and/or stores the multimedia objects.
- the external apparatus 200 may have an intrinsic identifier for identifying the external apparatus 200 on the network.
- an identifier of the external apparatus 200 may be any one of an internet protocol (IP) address, and a MAC address of the external apparatus 200 .
- IP internet protocol
- MAC MAC address
- Examples of the network described herein may include a wireless network, a wired network, a public network such as the Internet, a private network, a global system for mobile communication network (GSM), a general packet radio network (GPRS), a local area network (LAN), a wide area network (WAN), a metropolitan area network (MAN), a cellular network, a public switched telephone network (PSTN), a personal area network, Bluetooth, Wi-Fi direct, a near field communication, an ultra wide band, combinations thereof, and other arbitrary networks, but are not limited thereto.
- GSM global system for mobile communication network
- GPRS general packet radio network
- LAN local area network
- WAN wide area network
- MAN metropolitan area network
- PSTN public switched telephone network
- Bluetooth Wi-Fi direct
- a near field communication an ultra wide band, combinations thereof, and other arbitrary networks, but are not limited thereto.
- the second terminals 100 A and 100 B may be any one of various apparatuses transmitting a multimedia object, such as an image or sound, to the external apparatus 200 .
- the second terminals 100 A and 100 B may each be an image obtaining apparatus.
- an ‘image obtaining apparatus’ and a ‘terminal’ have the same meaning, but the present disclosure is not limited thereto.
- An image obtaining apparatus described herein may be an apparatus including a lens and an image sensor.
- the lens may denote a lens group including at least one lens.
- the image sensor may convert an image input from the lens into an electric signal.
- the image sensor may be a semiconductor device capable of converting an optical signal into an electric signal (hereinafter, described as an image), such as a charge-coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).
- CCD charge-coupled device
- CMOS complementary metal oxide semiconductor
- the image obtaining apparatus may be a camera that provides an RGB image with respect to a target space, an infrared image, or a distance image including distance information.
- the image obtaining apparatus may encode an obtained image via any one of various methods, and transmit the encoded image.
- the encoding may be performed by the image obtaining apparatus by encoding and compressing the obtained image.
- the encoded image may include an infra frame (I-frame), a predicted frame (P-frame), and a bidirectional frame (B-frame).
- I-frame is a key frame and is an independent frame that is not depending from another frame, and may be a relatively high frame capacity.
- the P-frame and the B-frame refer to an existing I-frame or a P-frame such that the P-frame only includes data regarding a region where motion is generated and the B-frame only includes data regarding a region having a difference, and thus may be relatively low frame capacity.
- the image obtaining apparatus may generate and transmit, to the external apparatus 200 , an I-frame through a network according to a pre-set condition, for example, at regular time intervals.
- the number of terminals may be determined according to an environment and/or conditions for installing the network management system.
- a terminal may be a first terminal or a second terminal.
- the first terminal may be a terminal newly connected to a network.
- the second terminal may be a terminal pre-connected to the network.
- the first and second terminals are classified according to functions for convenience of description, and thus, may have the same structure as each other.
- FIG. 2 is a block diagram of a terminal 100 according to an exemplary embodiment of the invention.
- the terminal 100 may be any one of the second terminals 100 A and 100 B of FIG. 1 and first terminals 100 C and 100 D, which will be described later. Accordingly, components included in the terminal 100 are also included in the second terminals 100 A and 100 B and the first terminals 100 C and 100 D.
- the terminal 100 may include a communication unit 110 , a controller 120 , and a memory 130 .
- the communication unit 110 may be an apparatus including hardware or software required for the terminal 100 to transmit a control signal and/or an image to another terminal and/or the external apparatus 200 on a network through a wired or wireless connection.
- the controller 120 may be any type of apparatus capable of processing data, such as a processor.
- the ‘processor’ may be, for example, a hardware-embedded data processing apparatus having a physically structured circuit so as to perform a function expressed in a code or command included in a program.
- the hardware-embedded data processing apparatus include processing apparatuses, such as a microprocessor, a central processing unit (CPU), a processor core, a multiprocessor, an application-specific integrated circuit (ASIC), and a field programmable gate array (FPGA), but are not limited thereto.
- the memory 130 performs a function of temporarily or permanently storing data processed by the terminal 100 .
- Examples of the memory 130 may include a magnetic storage medium and a flash storage medium, but are not limited thereto.
- the controller 120 of the terminal 100 may broadcast a first packet to the network.
- the broadcasting of the first packet may mean that the terminal 100 transmits the first packet to other at least one terminal connected to the network.
- the terminal 100 may transmit the first packet to the other at least one terminal on the network to provide notification that the terminal 100 has been newly added to the network.
- the first packet may be a packet requesting the other at least one terminal on the network for a response packet (a second packet or a third packet described later).
- the first packet may include at least one of a channel of the terminal 100 , a channel of the other at least one terminal on the network, a time slot in which image transmitting points of time of terminals on the network are assigned, and an updating point of time of a master terminal.
- the first packet that is initially transmitted by the terminal 100 when the terminal 100 is newly added to the network may not include information about some of the above items.
- Information about items, which is not included in the first packet may be updated based on a second packet received from another terminal on the network later, as will be described below.
- the controller 120 may receive a second packet transmitted by another terminal on the network in response to the first packet.
- the second packet is a response packet of the first packet described above, and may include a channel of a terminal that received the first packet (i.e., a terminal that transmitted the second packet) and a time slot in which image transmitting points of time of the terminals on the network are assigned.
- FIG. 3A is a diagram for describing operations of a first terminal 100 C when the first terminal 100 C is a terminal initially connected to a network, according to an exemplary embodiment of the invention.
- the first terminal 100 C is a terminal initially connected to the network.
- the controller 120 of the first terminal 100 C may broadcast a first packet to the network as described above. Also, the controller 120 of the first terminal 100 C may wait for a second packet transmitted by a second terminal in response to the first packet.
- the controller 120 of the first terminal 100 C is unable to receive a second packet from a second terminal.
- the controller 120 of the first terminal 100 C may set the first terminal 100 C to be a master terminal when a second packet is not received within a pre-set time interval after the first packet was broadcast.
- a ‘master terminal’ may be a subject of managing a channel of at least one terminal connected to a network, and a time slot in which an image transmitting point of time of the at least one terminal on the network is assigned.
- the controller 120 may initialize the first packet based on information of the first terminal 100 C.
- the controller 120 may initialize each item of the first packet to a blank and/or a very first setting value based on a premise that the first terminal 100 C is the only terminal existing in the network. For example, the controller 120 may set a first channel as a channel of the first terminal 100 C and initialize other channels to blanks by referring to channel information included in the first packet. Also, the controller 120 may assign a first slot of the time slot included in the first packet to an image transmitting point of time of the first terminal 100 C.
- FIG. 3B is a diagram for describing operations of a first terminal 100 D when the first terminal is not a terminal initially connected to a network, according to an exemplary embodiment of the invention.
- the controller 120 of the first terminal 100 D may broadcast a first packet to the network. Also, the controller 120 of the first terminal 100 D may receive at least one second packet transmitted by at least one of the second terminals 100 A and 100 B in response to the first packet.
- the controller 120 of the first terminal 100 D may set the first terminal 100 D to a master terminal. In other words, when the at least one second packet is received, the controller 120 of the first terminal 100 D may set the first terminal 100 D to the master terminal.
- a ‘master terminal’ may be a subject of managing a channel of at least one terminal connected to a network, and a time slot in which an image transmitting point of time of the at least one terminal on the network is assigned.
- the controller 120 of the first terminal 100 D may update the first packet based on at least one of information of the first terminal 100 D and the at least one second packet. For example, the controller 120 of the first terminal 100 D may assign a channel of the first terminal 100 D based on the at least one second packet. Also, the controller 120 of the first terminal 100 D may update a time slot in which image transmitting points of time of the second terminals 100 A and 100 B and an image transmitting point of time of the first terminal 100 D are assigned according to a pre-set method, based on the at least one second packet. Here, the controller 120 of the first terminal 100 D may assign a channel of each of the second terminals 100 A and 100 B based on the at least one second packet.
- FIG. 4 is a diagram for describing a method of assigning, by the controller 120 of the first terminal 100 D, a channel of the first terminal 100 D, according to an exemplary embodiment of the invention.
- the first terminal 100 D is connected to a network while the second terminals 100 A and 100 B are connected to the network.
- the controller 120 may assign an empty channel as the channel of the first terminal 100 by referring to second packets transmitted by the second terminals 100 A and 100 B.
- the second packets are response packets with respect to the first packet, and may include channels of the second terminals 100 A and 100 B that transmitted the second packets. Accordingly, the controller 120 may collect at least one second packet to find an empty channel, and assign the empty channel as the channel of the first terminal 100 D.
- assigning of a certain channel as the channel of the first terminal 100 D may mean that the certain channel and identification (ID) information of the first terminal 100 D are mapped to each other.
- the ID information of the first terminal 100 D may include any one of an internet protocol (IP) address, a MAC address, and a name of the first terminal 100 D.
- IP internet protocol
- the controller 120 may assign a channel of the existing terminal as the channel of the first terminal 100 D.
- the ID information of the first terminal 100 D and ID information of the existing terminal may be matched.
- the controller 120 may assign an empty channel that has not been assigned as the channel of the first terminal 100 D.
- the first terminal 100 D is added to expand a channel
- the controller 120 may determine, based on the second packet received from the second terminal 100 A, that a first channel 401 is assigned to the second terminal 100 A. Also, the controller 120 may determine, based on the second packet received from the second terminal 100 B, that a second channel 402 is assigned to the second terminal 100 B. Accordingly, the controller 120 may set a third channel 403 , which is an empty channel, as the channel of the first terminal 100 D. In other words, the controller 120 may map the third channel 403 and the ID information of the first terminal 100 D.
- the first packet may be updated by adding the mapped ID information.
- the controller 120 may update the first packet by adding mapping information of the first channel 401 and ID information of the second terminal 100 A and mapping information of the second channel 402 and ID information of the second terminal 100 B.
- a subject managing channels of terminals and a time slot may be set to be any one of the terminals such that a network is managed without a separate managing subject.
- deterioration of a certain terminal may be prevented and a load may be distributed.
- channel information is used such that a new terminal is easily added when an existing terminal malfunctions.
- FIG. 5 is a diagram for describing a method of updating, by the controller 120 , a time slot, according to an exemplary embodiment of the invention.
- the first terminal 100 D is connected to a network while the second terminals 100 A and 100 B are connected to the network.
- the controller 120 may update a time slot in which image transmitting points of time of the second terminals 100 A and 100 B and an image transmitting point of time of the first terminal 100 D are assigned according to a pre-set method, based on at least one second packet.
- the pre-set method may be assigning of the image transmitting points of time such that time intervals of transmitting I-frames of images obtained by the first terminal 100 D and the second terminals 100 A and 100 B are largest.
- a time interval of transmitting such I-frames may be set to be largest such that a network is not rapidly loaded beyond a design capacity.
- a time interval of transmitting I-frames of the second terminals 100 A and 100 B may consist of 6 slots.
- the second terminal 100 A may transmit the I-frame at a point of time corresponding to a slot 1 in one period T
- the second terminal 100 B may transmit the I-frame at a point of time corresponding to a slot 7 in the period T.
- time intervals of transmitting I-frames of the first terminal 100 D and the second terminals 100 A and 100 B may be 4 slots.
- the second terminal 100 A may transmit the I-frame at the point of time corresponding to the slot 1 in the period T
- the second terminal 100 B may transmit the I-frame at a point of time corresponding to a slot 5 in the period T
- the first terminal 100 D may transmit the I-frame at a point of time corresponding to a slot 9 in the period T.
- the first terminal 100 D and the second terminals 100 A and 100 B generate and transmit an image including an I-frame, a P-frame, and a B-frame according to uniform periods T to the external apparatus 200 through a network, and at this time, the period T may include 12 slots. Accordingly, the time intervals described above may vary according to a length of the period T and/or the number of terminals on the network.
- the first terminal 100 D and the second terminals 100 A and 100 B may transmit an image in its slot according to an updated time slot, to the external apparatus 200 through the network.
- the controller 120 may broadcast a first packet, updated according to the above processes, to the network.
- the updated first packet may include information about all items of a first packet, unlike in a first packet that is broadcast initially when the first terminal 100 D is initially connected to the network.
- the updated first packet may include channels and updated time slots of the first terminal 100 D and the second terminals 100 A and 100 B.
- the second terminals 100 A and 100 B may update its setting information based on the updated first packet, as will be described later.
- the updated first packet may be a packet requesting at least one terminal for a response packet (a second packet or a third packet as described below)
- the second terminals 100 A and 100 B may transmit a third packet to the first terminal 100 D in response to the updated first packet.
- the controller 120 of the first terminal 100 D may receive at least one third packet transmitted from at least one of the second terminals 100 A and 100 B on the network in response to the updated first packet.
- the controller 120 may determine a malfunction of the at least one of the second terminals 100 A and 100 B based on the received at least one third packet. For example, the controller 120 may determine that a certain terminal malfunctions when a third packet is not received from the certain terminal. Also, the controller 120 may determine that a certain terminal malfunctions when a time slot included in a third packet received from the certain terminal is different from a time slot included in the updated first packet.
- the controller 120 may repeatedly broadcast an updated first packet and receive a third packet as such, thereby periodically determining a malfunction of the second terminals 100 A and 100 B.
- FIGS. 6 and 7 are flowcharts of a network managing method performed by the controller 120 , according to an exemplary embodiment of the invention. Hereinafter, details overlapping those described with reference to FIGS. 1 through 5 will not be repeated.
- the controller 120 of the first terminal 100 C may broadcast a first packet to the network, in operation S 61 .
- the broadcasting of the first packet may mean that the first terminal 100 C transmits the first packet to at least one terminal connected to the network.
- the first terminal 100 C may transmit the first packet to the at least one terminal on the network to notify the at least one terminal that the first terminal 100 C has been newly added.
- the first packet may be a packet requesting another at least one terminal on the network for a response packet (a second packet or a third packet described below).
- the first packet may include at least one of a channel of the first terminal 100 C that has been newly added, a channel of the other at least one terminal on the network, a time slot in which image transmitting points of time of terminals on the terminal are assigned, and an updating point of time of a master terminal.
- the first packet that is initially transmitted by the first terminal 100 C when the first terminal 100 C is newly added to the network may not include information about some of the above items.
- Information about items, which is not included in the first packet may be updated based on a second packet received from another terminal on the network later, as will be described below.
- the controller 120 may receive a second packet in operation S 62 , which is transmitted by another terminal on the network in response to the first packet. Also, the controller 120 may update a master terminal and the first packet in operation S 63 , based on at least one of whether a second packet is received, information of the first terminal 100 C, and at least one second packet.
- the controller 120 may determine whether a second packet is received within a pre-set time interval in operation S 621 , and when it is determined that the second packet is not received within the pre-set time interval, set the first terminal 100 C as a master terminal in operation S 634 .
- the first terminal 100 C may be an initial terminal connected to the network.
- the controller 120 may initialize the first packet based on information of the first terminal 100 C. In other words, the controller 120 may assign a channel of the first terminal 100 C in operation S 635 and update a time slot in operation S 636 .
- the controller 120 may initialize each item of the first packet to a blank and/or a very first setting value based on a premise that the first terminal 100 C is one and only terminal existing on the network. For example, the controller 120 may set a first channel as a channel of the first terminal 100 C by referring to channel information included in the first packet, and initialize remaining channels to blanks. Also, the controller 120 may assign a very first slot of the time slot included in the first packet to an image transmitting point of time of the first terminal 100 C.
- the controller 120 may set the first terminal 100 D as a master terminal in operation S 631 . In other words, the controller 120 may set the first terminal 100 D as a master terminal when at least one second packet is received.
- the controller 120 may update the first packet based on information of the first terminal 100 D and at least one second packet. For example, in operation S 632 , the controller 120 may assign a channel of the first terminal 100 D based on the second packet. Here, the controller 120 may assign a channel of the other at least one terminal based on the second packet.
- the controller 120 of the first terminal 100 D may assign an empty channel as the channel of the first terminal 100 D by referring to the second packets transmitted by the second terminals 100 A and 100 B.
- the second packets are response packets with respect to the first packet, and may include the channels of the second terminals 100 A and 100 B that transmitted the second packets. Accordingly, the controller 120 of the first terminal 100 D may determine an empty channel by collecting at least one second packet and assign the empty channel as a channel of the first terminal 100 D.
- the controller 120 may assign a channel of the existing terminal as the channel of the first terminal 100 D.
- the ID information of the first terminal 100 D may be identical to ID information of the existing terminal.
- the controller 120 may assign an empty channel that has not been assigned as the channel of the first terminal 100 D.
- the first terminal 100 D is added to expand a channel
- the controller 120 may determine, based on the second packet received from the second terminal 100 A, that the first channel 401 is assigned to the second terminal 100 A. Also, the controller 120 may determine, based on the second packet received from the second terminal 100 B, that the second channel 402 is assigned to the second terminal 100 B. Accordingly, the controller 120 may set the third channel 403 that is an empty channel as the channel of the first terminal 100 D. In other words, the controller 120 may map the third channel 403 and the ID information of the first terminal 100 D.
- the first packet may be updated by adding the mapped ID information.
- the controller 120 may update the first packet by adding mapping information of the first channel 401 and ID information of the second terminal 100 A and mapping information of the second channel 402 and ID information of the second terminal 100 B.
- a subject managing channels of terminals and a time slot may be set to be any one of the terminals such that a network is managed without a separate managing subject.
- deterioration of a certain terminal may be prevented and a load may be distributed.
- channel information is used such that a new terminal is easily added when an existing terminal malfunctions.
- the controller 120 may update a time slot in which an image transmitting point of time of the other at least one terminal and an image transmitting point of time of the first terminal 100 D are assigned according to a pre-set method, based on the at least one second packet, in operation S 633 .
- the controller 120 may update the time slot in which the image transmitting points of time of the second terminals 100 A and 100 B and the image transmitting point of time of the first terminal 100 D are assigned according to the pre-set method, based on the at least one second packet.
- the pre-set method may include assigning of the image transmitting points of time such that time intervals of transmitting I-frames of images obtained by the first terminal 100 D and the second terminals 100 A and 100 B are largest.
- a time interval of transmitting such I-frames may be set to be largest such that a network is not rapidly loaded beyond a design capacity.
- the time interval of transmitting the I-frames of the second terminals 100 A and 100 B may be 6 slots.
- the second terminal 100 A may transmit the I-frame at a point of time corresponding to the slot 1 in the period T
- the second terminal 100 B may transmit the I-frame at a point of time corresponding to the slot 7 in the period T.
- the time intervals of transmitting the I-frames of the first terminal 100 D and the second terminals 100 A and 100 B may be 4 slots.
- the second terminal 100 A may transmit the I-frame at the point of time corresponding to the slot 1 in the period T
- the second terminal 100 B may transmit the I-frame at a point of time corresponding to the slot 5 in the period T
- the first terminal 100 D may transmit the I-frame at a point of time corresponding to the slot 9 in the period T.
- the first terminal 100 D and the second terminals 100 A and 100 B generate and transmit an image including an I-frame, a P-frame, and a B-frame according to uniform periods T to the external apparatus 200 through a network, and at this time, the period T may include 12 slots. Accordingly, the time intervals described above may vary according to a length of the period T and/or the number of terminals on the network.
- the first terminal 100 D and the second terminals 100 A and 100 B may transmit an image in its slot according to an updated time slot, to the external apparatus 200 through the network.
- the controller 120 may broadcast the first packet updated according to above processes, to the network, in operation S 64 .
- the updated first packet may include information about all items of a first packet, unlike in a first packet that is broadcast initially when the first terminal 100 D is initially connected to the network.
- the second terminal 100 A or 100 B that received the updated first packet may update its setting information based on the updated first packet, as will be described later.
- the updated first packet may be a packet requesting at least one terminal for a response packet (a second packet or a third packet as described below)
- the second terminal 100 A or 100 B that received the updated first packet may transmit a third packet to the first terminal 100 D in response to the updated first packet.
- the controller 120 of the first terminal 100 D may receive at least one third packet transmitted from at least one of terminals on the network in response to the updated first packet, in operation S 65 .
- the controller 120 may determine malfunction of the at least one of the terminals that transmitted the at least one third packet based on the received at least one third packet. For example, the controller 120 may determine that a certain terminal malfunctions when a third packet is not received from the certain terminal. Also, the controller 120 may determine that a certain terminal malfunctions when a time slot included in a third packet received from the certain terminal is different from a time slot included in the updated first packet.
- the controller 120 may repeatedly broadcast an updated first packet and receive a third packet as such, thereby periodically determining malfunction of another terminal.
- the first terminal may be a terminal newly added to the network
- the second terminal may be a terminal pre-existing in the network.
- the first and second terminals are classified according to functions for convenience of description, and thus, may have the same structure as each other.
- FIG. 8 is a flowchart of a network managing method performed by a controller of a second terminal, according to an exemplary embodiment of the invention.
- the controller of the second terminal may receive a first packet broadcast by a first terminal through a network, in operation S 81 . Also, the controller may update a time slot based on the received first packet in operation S 82 .
- the first terminal updates the first packet and broadcasts the updated first packet to the network, and thus the controller may receive such an updated first packet and update the time slot of the second terminal by referring to a time slot in the received first packet.
- the controller may update the current time slot of the second terminal to the time slot in the received first packet.
- the controller of the second terminal may update its time slot by referring to the time slot of the first terminal, which has been newly assigned according to the addition of the first terminal to the network.
- the time slots of the second terminals 100 A and 100 B are as shown in the time line 501 before the first terminal 100 D is newly added.
- the time interval of transmitting the I-frames of the second terminals 100 A and 100 B is 6 slots.
- the second terminals 100 A and 100 B may receive an updated first packet from the first terminal 100 D, and update the time slot by referring to the updated first packet.
- the time slot of the second terminals 100 A and 100 B may be updated to 4 slots that is a time interval of transmitting the I-frames of the first terminal 100 D and the second terminals 100 A and 100 B.
- the controller of the second terminal may transmit, to the first terminal, a second packet including at least one of the updated time slot and a channel of the second terminal, in operation S 83 .
- the transmitted second packet may be used by the first terminal to determine malfunction of the second terminal.
- the controller of the second terminal may determine whether a master terminal satisfies a master terminal changing condition. For example, when a master terminal is changed at regular time periods according to an order of channels, the master terminal changing condition may be a lapse of a certain period of time.
- the controller of the second terminal may transmit a fourth packet to the master terminal.
- the fourth packet may include at least one of a channel of the second terminal and information about changing of a master terminal.
- the controller of the second terminal may update the master terminal to the second terminal, update the first packet based on information of the second terminal, and broadcast the updated first packet to the network.
- the updating of the master terminal, the updating of the first packet, and the broadcasting of the updated first packet, which are performed by the controller, have been described above, and thus details thereof are not provided again.
- a network managing method and an image obtaining apparatus which efficiently use a network, may be realized.
- a network managing method and an image obtaining apparatus which manage a network by only using an image obtaining apparatus without a separate managing subject, may be realized.
- a network managing method and an image obtaining apparatus which prevent deterioration of a certain image obtaining apparatus by continuously updating a managing subject, may be realized.
- the network managing method according to the inventive concepts may also be embodied as computer-readable codes on a non-transitory computer-readable recording medium.
- the non-transitory computer-readable recording medium is any data storage device that can store data which can be thereafter read by a computer system. Examples of the non-transitory computer-readable recording medium include read-only memory (ROM), random-access memory (RAM), CD-ROMs, magnetic tapes, floppy disks, optical data storage devices, etc.
- the non-transitory computer-readable recording medium can also be distributed over network coupled computer systems so that the computer-readable code is stored and executed in a distributed fashion. Also, functional programs, codes, and code segments for accomplishing the present disclosure can be easily construed by programmers skilled in the art to which the present disclosure pertains.
Abstract
Description
- This application claims priority from and the benefit of Korean Patent Application No. 10-2016-0003306, filed on Jan. 11, 2016, and Korean Patent Application No. 10-2016-0152972, filed on Nov. 16, 2016, in the Korean Intellectual Property Office, both of which are hereby incorporated by reference for all purposes as if fully set forth herein.
- Field
- Exemplary embodiments of the present invention relate to a method of managing a network and an image obtaining apparatus.
- Discussion of the Background
- Image obtaining apparatuses are currently being installed in many locations, and technologies of recording, storing, and transmitting images obtained by the image obtaining apparatuses are under constant development.
- In particular, according to the increased number of installed image obtaining apparatuses, multi-channel monitors that monitor observation target regions by receiving images from a plurality of cameras are being actively developed. Monitoring cameras included in such multi-channel monitors are connected to the same network to transmit an image obtained by each image obtaining apparatus.
- Situations in which points of time when the image obtaining apparatuses generate and transmit I-frames coincide frequently occur for various reasons, such as power being applied to the image obtaining apparatuses at the same time. In this case, when the plurality of image obtaining apparatuses simultaneously transmit the I-frames, the load on the network instantaneously increases, and thus, some image data transmitted by the image obtaining apparatuses may be lost.
- Exemplary embodiments of the invention include a method of managing a network that enables efficient use of a network by distributing points of time when a plurality of image obtaining apparatuses transmit I-frames.
- Exemplary embodiments of the invention also include a method of managing a network and an image obtaining apparatus enabling a network to be managed through only the image obtaining apparatus without a separate managing subject.
- Exemplary embodiments invention also include a method of managing a network and an image obtaining apparatus capable of preventing deterioration of a certain image obtaining apparatus by continuously updating a managing subject.
- Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments.
- An exemplary embodiment of the invention discloses a method of managing a network performed by a first terminal, the method including: broadcasting a first packet to a network; receiving at least one second packet transmitted by at least one second terminal on the network in response to the first packet; updating a master terminal in the network and the first packet based on the at least one second packet; and broadcasting the updated first packet to the network.
- When the at least one second packet is not received within a pre-set time interval from a point of time when the first packet was broadcast, the updating of the master terminal and the first packet may include: setting the first terminal as the master terminal; and initializing the first packet based on information of the first terminal.
- When the at least one second packet is received, the updating of the master terminal and the first packet includes: setting the first terminal as the master terminal; and updating the first packet based on at least one of information of the first terminal and the at least one second packet.
- The first terminal and the at least one second terminal may each be an image obtaining apparatus.
- The first packet may include a channel of the first terminal, a channel of each of the at least one second terminal, and a time slot, and the updating of the first packet may include: determining the channel of each of the at least one second terminal based on the at least one second packet; assigning the channel of the first terminal based on the at least one second packet; and updating the time slot, in which an image transmitting point of time of the at least one second terminal that transmitted the at least one second packet and an image transmitting point of time of the first terminal are assigned according to a pre-set method, based on the at least one second packet.
- The pre-set method may include setting the image transmitting points of time such that time intervals of transmitting I-frames of images obtained by the first terminal and the at least one second terminal are largest.
- The method may further include, after the broadcasting of the updated first packet to the network: receiving at least one third packet transmitted by the at least one second terminal on the network in response to the updated first packet; and determining a malfunction of the at least one second terminal based on the at least one third packet.
- The first packet may include at least one of a channel of the first terminal, a channel of each of the at least one second terminal, a time slot in which an image transmitting point of time of the at least one second terminal and an image transmitting point of time of the first terminal are assigned according to a pre-set method, and a point of time when the master terminal is updated to the first terminal.
- The at least one second packet may include a channel of each of the at least one second terminal and a time slot in which an image transmitting point of time of the at least one second terminal and an image transmitting point of time of the first terminal are assigned according to a pre-set method.
- An exemplary embodiment of the invention also discloses a method of managing a network performed by a second terminal including: receiving a first packet broadcast by a first terminal through a network; updating a time slot based on the received first packet; and transmitting, to the first terminal, a second packet including at least one of the updated time slot and a channel of the second terminal.
- The updating of the time slot may include, when a time slot included in the first packet is different from a current time slot of the second terminal, updating the current time slot of the second terminal to the time slot included in the first packet.
- The method may further include: determining whether a master terminal satisfies a master terminal changing condition; when it is determined that the master terminal satisfies the master terminal changing condition, transmitting a fourth packet to the master terminal; updating the master terminal to the second terminal; updating the first packet based on information of the second terminal; and broadcasting the updated first packet to the network.
- An exemplary embodiment of the invention also discloses a first image obtaining apparatus including a controller configured to: broadcast a first packet to a network; receive at least one second packet transmitted by at least one second image obtaining apparatus on the network in response to the first packet; update a master terminal in the network and the first packet based on the at least one second packet; and broadcast the updated first packet to the network.
- The controller may be further configured to, when the at least one second packet is not received within a pre-set time interval after the first packet was broadcast: set the first image obtaining apparatus as the master terminal; and initialize the first packet based on information of the first image obtaining apparatus.
- The controller may be further configured to, when the at least one second packet is received: set the first image obtaining apparatus as the master terminal; and update the first packet based on at least one of information of the first image obtaining apparatus and the at least one second packet.
- The first packet may include a channel of the first image obtaining apparatus, a channel of each of the at least one second image obtaining apparatus, and a time slot, and the controller may be further configured to: determine a channel of each of the at least one second image obtaining apparatus based on the at least one second packet; assign the channel of the first image obtaining apparatus based on the at least one second packet; and updating the time slot in which an image transmitting point of time of the at least one second image obtaining apparatus that transmitted the at least one second packet and an image transmitting point of time of the first image obtaining apparatus are assigned according to a pre-set method, based on the at least one second packet.
- The pre-set method may include assigning the image transmitting points of time such that time intervals of transmitting I-frames of images obtained by the first image obtaining apparatus and the at least one second image obtaining apparatus are largest.
- The controller may be further configured to: receive at least one third packet transmitted by the at least one second image obtaining apparatus on the network in response to the updated first packet; and determine a malfunction of the at least one second image obtaining apparatus based on the at least one third packet.
- An exemplary embodiment of the invention also discloses a second image obtaining apparatus including a controller configured to: receive a first packet broadcast by a first image obtaining apparatus through a network; update a time slot based on the received first packet; and transmit a second packet including at least one of the updated time slot and a channel of the second image obtaining apparatus to the first image obtaining apparatus.
- The controller may be further configured to, when a time slot included in the first packet is different from a current time slot of the second image obtaining apparatus, updating the current time slot of the second image obtaining apparatus to the time slot included in the first packet.
- The controller may be further configured to: determine whether a master terminal satisfies a master terminal changing condition; when it is determined that the master terminal satisfies the master terminal changing condition, transmit a fourth packet to the master terminal; update the master terminal to the second image obtaining apparatus; update the first packet based on information of the second image obtaining apparatus; and broadcast the updated first packet to the network.
- These and/or other aspects will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings in which:
-
FIG. 1 is a schematic diagram of a network management system according to an exemplary embodiment of the invention. -
FIG. 2 is a block diagram of a terminal according to an exemplary embodiment of the invention. -
FIG. 3A is a diagram for describing operations of a first terminal when the first terminal is a terminal initially connected to a network, according to an exemplary embodiment of the invention. -
FIG. 3B is a diagram for describing operations of a first terminal when the first terminal is not a terminal initially connected to a network, according to an exemplary embodiment of the invention. -
FIG. 4 is a diagram for describing a method of assigning, by a controller, a channel of a first terminal, according to an exemplary embodiment of the invention. -
FIG. 5 is a diagram for describing a method of updating, by a controller, a time slot, according to an exemplary embodiment of the invention. -
FIG. 6 andFIG. 7 are flowcharts of a network managing method performed by a controller, according to an exemplary embodiment of the invention. -
FIG. 8 is a flowchart of a network managing method performed by a controller of a second terminal, according to an exemplary embodiment of the invention. - As the disclosure allows for various changes and numerous exemplary embodiments of the invention, particular exemplary embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present disclosure to particular modes of practice, and it will to be appreciated that all changes, equivalents, and substitutes that do not depart from the spirit and technical scope of the present disclosure are encompassed in the present disclosure. In the description of the present disclosure, certain detailed explanations of related art are omitted when it is deemed that they may unnecessarily obscure the essence of the disclosure.
- While such terms as “first”, “second”, etc., may be used to describe various components, such components must not be limited to the above terms. The above terms are used only to distinguish one component from another.
- The terms used in one or more exemplary embodiments below are merely used to describe particular embodiments, and are not intended to limit the present disclosure. An expression used in the singular encompasses the expression in the plural, unless it has a clearly different meaning in the context. In the present specification, it is to be understood that terms such as “including” or “having”, etc., are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof disclosed in the specification, and are not intended to preclude the possibility that one or more other features, numbers, steps, actions, components, parts, or combinations thereof may exist or may be added.
- As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. Expressions such as “at least one of,” when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list.
- The present disclosure may be described in terms of functional block components and various processing steps. Such functional blocks may be realized by any number of hardware and/or software components configured to perform the specified functions. For example, the present disclosure may employ various integrated circuit components, e.g., memory elements, processing elements, logic elements, look-up tables, and the like, which may carry out a variety of functions under the control of one or more microprocessors or other control devices. Similarly, where the elements of the present disclosure are implemented using software programming or software elements the disclosure may be implemented with any programming or scripting language such as C, C++, Java, assembler, or the like, with the various algorithms being implemented with any combination of data structures, objects, processes, routines or other programming elements. Functional aspects may be implemented in algorithms that execute on one or more processors. Furthermore, the present disclosure could employ any number of conventional techniques for electronics configuration, signal processing and/or control, data processing and the like. The words “mechanism” and “element” are used broadly and are not limited to mechanical or physical embodiments, but can include software routines in conjunction with processors, etc.
-
FIG. 1 is a schematic diagram of a network management system according to an exemplary embodiment of the invention. - Referring to
FIG. 1 , the network management system may include at least one terminal, for example,second terminals external apparatus 200. - The
external apparatus 200 may receive multimedia objects, such as images or sound, from thesecond terminals - Accordingly, the
external apparatus 200 may be any one of various units for storing and then re-providing information handled by an electronic communication device. For example, theexternal apparatus 200 may be one of a video management system (VMS), a central management system (CMS), a network video recorder (NVR), and a digital video recorder (DVR). Alternatively, theexternal apparatus 200 may be a personal computer (PC) or a portable terminal. However, theexternal apparatus 200 is not limited thereto, and may be any apparatus as long as it receives multimedia objects from thesecond terminals - The
external apparatus 200 may have an intrinsic identifier for identifying theexternal apparatus 200 on the network. Here, an identifier of theexternal apparatus 200 may be any one of an internet protocol (IP) address, and a MAC address of theexternal apparatus 200. At least oneexternal apparatus 200 is included in the present disclosure. - Examples of the network described herein may include a wireless network, a wired network, a public network such as the Internet, a private network, a global system for mobile communication network (GSM), a general packet radio network (GPRS), a local area network (LAN), a wide area network (WAN), a metropolitan area network (MAN), a cellular network, a public switched telephone network (PSTN), a personal area network, Bluetooth, Wi-Fi direct, a near field communication, an ultra wide band, combinations thereof, and other arbitrary networks, but are not limited thereto.
- The
second terminals external apparatus 200. For example, thesecond terminals - Hereinafter, for convenience of description, an ‘image obtaining apparatus’ and a ‘terminal’ have the same meaning, but the present disclosure is not limited thereto.
- An image obtaining apparatus described herein may be an apparatus including a lens and an image sensor. The lens may denote a lens group including at least one lens. The image sensor may convert an image input from the lens into an electric signal. For example, the image sensor may be a semiconductor device capable of converting an optical signal into an electric signal (hereinafter, described as an image), such as a charge-coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).
- The image obtaining apparatus may be a camera that provides an RGB image with respect to a target space, an infrared image, or a distance image including distance information.
- The image obtaining apparatus may encode an obtained image via any one of various methods, and transmit the encoded image. Herein, the encoding may be performed by the image obtaining apparatus by encoding and compressing the obtained image. The encoded image may include an infra frame (I-frame), a predicted frame (P-frame), and a bidirectional frame (B-frame). The I-frame is a key frame and is an independent frame that is not depending from another frame, and may be a relatively high frame capacity. However, the P-frame and the B-frame refer to an existing I-frame or a P-frame such that the P-frame only includes data regarding a region where motion is generated and the B-frame only includes data regarding a region having a difference, and thus may be relatively low frame capacity.
- The image obtaining apparatus may generate and transmit, to the
external apparatus 200, an I-frame through a network according to a pre-set condition, for example, at regular time intervals. - There may be at least one terminal in the network management system, according to an exemplary embodiment of the invention. For example, there may be two terminals, i.e., the
second terminals FIG. 1 , or there may be only one terminal or a plurality of terminals. The number of terminals may be determined according to an environment and/or conditions for installing the network management system. - Hereinafter, for convenience of description, a terminal may be a first terminal or a second terminal. The first terminal may be a terminal newly connected to a network. The second terminal may be a terminal pre-connected to the network. However, herein, the first and second terminals are classified according to functions for convenience of description, and thus, may have the same structure as each other.
-
FIG. 2 is a block diagram of a terminal 100 according to an exemplary embodiment of the invention. Here, the terminal 100 may be any one of thesecond terminals FIG. 1 andfirst terminals second terminals first terminals - Referring to
FIG. 2 , the terminal 100 may include acommunication unit 110, acontroller 120, and amemory 130. - The
communication unit 110, according to an exemplary embodiment of the invention, may be an apparatus including hardware or software required for the terminal 100 to transmit a control signal and/or an image to another terminal and/or theexternal apparatus 200 on a network through a wired or wireless connection. - The
controller 120, according to an exemplary embodiment of the invention, may be any type of apparatus capable of processing data, such as a processor. Here, the ‘processor’ may be, for example, a hardware-embedded data processing apparatus having a physically structured circuit so as to perform a function expressed in a code or command included in a program. As such, examples of the hardware-embedded data processing apparatus include processing apparatuses, such as a microprocessor, a central processing unit (CPU), a processor core, a multiprocessor, an application-specific integrated circuit (ASIC), and a field programmable gate array (FPGA), but are not limited thereto. - The
memory 130 performs a function of temporarily or permanently storing data processed by theterminal 100. Examples of thememory 130 may include a magnetic storage medium and a flash storage medium, but are not limited thereto. - Hereinafter, operations of a newly connected terminal (a first terminal) when the terminal 100 is newly connected to a network will be described first, and then operations of an existing terminal (a second terminal) when the terminal 100 is newly connected to a network will be described later.
- <First Terminal>
- When the terminal 100 is connected to a network, the
controller 120 of the terminal 100 may broadcast a first packet to the network. - Herein, the broadcasting of the first packet may mean that the terminal 100 transmits the first packet to other at least one terminal connected to the network. In other words, the terminal 100 may transmit the first packet to the other at least one terminal on the network to provide notification that the terminal 100 has been newly added to the network.
- Here, the first packet may be a packet requesting the other at least one terminal on the network for a response packet (a second packet or a third packet described later). The first packet may include at least one of a channel of the terminal 100, a channel of the other at least one terminal on the network, a time slot in which image transmitting points of time of terminals on the network are assigned, and an updating point of time of a master terminal. However, the first packet that is initially transmitted by the terminal 100 when the terminal 100 is newly added to the network may not include information about some of the above items. Information about items, which is not included in the first packet, may be updated based on a second packet received from another terminal on the network later, as will be described below.
- The
controller 120 may receive a second packet transmitted by another terminal on the network in response to the first packet. - The second packet is a response packet of the first packet described above, and may include a channel of a terminal that received the first packet (i.e., a terminal that transmitted the second packet) and a time slot in which image transmitting points of time of the terminals on the network are assigned.
-
FIG. 3A is a diagram for describing operations of afirst terminal 100C when thefirst terminal 100C is a terminal initially connected to a network, according to an exemplary embodiment of the invention. - Referring to
FIG. 3A , assume that thefirst terminal 100C is a terminal initially connected to the network. - First, the
controller 120 of thefirst terminal 100C may broadcast a first packet to the network as described above. Also, thecontroller 120 of thefirst terminal 100C may wait for a second packet transmitted by a second terminal in response to the first packet. - However, in
FIG. 3A , since thefirst terminal 100C is a terminal initially connected to the network, thecontroller 120 of thefirst terminal 100C is unable to receive a second packet from a second terminal. - The
controller 120 of thefirst terminal 100C may set the first terminal 100C to be a master terminal when a second packet is not received within a pre-set time interval after the first packet was broadcast. - Herein, a ‘master terminal’ may be a subject of managing a channel of at least one terminal connected to a network, and a time slot in which an image transmitting point of time of the at least one terminal on the network is assigned.
- The
controller 120 may initialize the first packet based on information of thefirst terminal 100C. In detail, thecontroller 120 may initialize each item of the first packet to a blank and/or a very first setting value based on a premise that thefirst terminal 100C is the only terminal existing in the network. For example, thecontroller 120 may set a first channel as a channel of thefirst terminal 100C and initialize other channels to blanks by referring to channel information included in the first packet. Also, thecontroller 120 may assign a first slot of the time slot included in the first packet to an image transmitting point of time of thefirst terminal 100C. -
FIG. 3B is a diagram for describing operations of afirst terminal 100D when the first terminal is not a terminal initially connected to a network, according to an exemplary embodiment of the invention. - Referring to
FIG. 3B , assume that the twosecond terminals - As described above, the
controller 120 of thefirst terminal 100D may broadcast a first packet to the network. Also, thecontroller 120 of thefirst terminal 100D may receive at least one second packet transmitted by at least one of thesecond terminals - In this case, the
controller 120 of thefirst terminal 100D may set the first terminal 100D to a master terminal. In other words, when the at least one second packet is received, thecontroller 120 of thefirst terminal 100D may set the first terminal 100D to the master terminal. - Herein, a ‘master terminal’ may be a subject of managing a channel of at least one terminal connected to a network, and a time slot in which an image transmitting point of time of the at least one terminal on the network is assigned.
- The
controller 120 of thefirst terminal 100D may update the first packet based on at least one of information of thefirst terminal 100D and the at least one second packet. For example, thecontroller 120 of thefirst terminal 100D may assign a channel of thefirst terminal 100D based on the at least one second packet. Also, thecontroller 120 of thefirst terminal 100D may update a time slot in which image transmitting points of time of thesecond terminals first terminal 100D are assigned according to a pre-set method, based on the at least one second packet. Here, thecontroller 120 of thefirst terminal 100D may assign a channel of each of thesecond terminals -
FIG. 4 is a diagram for describing a method of assigning, by thecontroller 120 of thefirst terminal 100D, a channel of thefirst terminal 100D, according to an exemplary embodiment of the invention. For convenience of description, as described above inFIG. 3B , it is assumed that thefirst terminal 100D is connected to a network while thesecond terminals - The
controller 120 may assign an empty channel as the channel of thefirst terminal 100 by referring to second packets transmitted by thesecond terminals second terminals controller 120 may collect at least one second packet to find an empty channel, and assign the empty channel as the channel of thefirst terminal 100D. - Here, assigning of a certain channel as the channel of the
first terminal 100D may mean that the certain channel and identification (ID) information of thefirst terminal 100D are mapped to each other. The ID information of thefirst terminal 100D may include any one of an internet protocol (IP) address, a MAC address, and a name of thefirst terminal 100D. - When the
first terminal 100D is added so as to replace an existing terminal due to malfunction of the existing terminal, thecontroller 120 may assign a channel of the existing terminal as the channel of thefirst terminal 100D. In this case, the ID information of thefirst terminal 100D and ID information of the existing terminal may be matched. When thefirst terminal 100D is added to expand a channel, thecontroller 120 may assign an empty channel that has not been assigned as the channel of thefirst terminal 100D. - In
FIG. 4 , thefirst terminal 100D is added to expand a channel, and thecontroller 120 may determine, based on the second packet received from thesecond terminal 100A, that afirst channel 401 is assigned to thesecond terminal 100A. Also, thecontroller 120 may determine, based on the second packet received from thesecond terminal 100B, that asecond channel 402 is assigned to thesecond terminal 100B. Accordingly, thecontroller 120 may set athird channel 403, which is an empty channel, as the channel of thefirst terminal 100D. In other words, thecontroller 120 may map thethird channel 403 and the ID information of thefirst terminal 100D. - The first packet may be updated by adding the mapped ID information. Here, the
controller 120 may update the first packet by adding mapping information of thefirst channel 401 and ID information of thesecond terminal 100A and mapping information of thesecond channel 402 and ID information of thesecond terminal 100B. - As such, according to an exemplary embodiment of the invention, a subject managing channels of terminals and a time slot may be set to be any one of the terminals such that a network is managed without a separate managing subject.
- In addition, according to an exemplary embodiment of the invention, by continuously updating a managing subject, deterioration of a certain terminal may be prevented and a load may be distributed.
- Also, according to an exemplary embodiment of the invention, channel information is used such that a new terminal is easily added when an existing terminal malfunctions.
-
FIG. 5 is a diagram for describing a method of updating, by thecontroller 120, a time slot, according to an exemplary embodiment of the invention. For convenience of description, as described above inFIG. 3B , it is assumed that thefirst terminal 100D is connected to a network while thesecond terminals - The
controller 120 may update a time slot in which image transmitting points of time of thesecond terminals first terminal 100D are assigned according to a pre-set method, based on at least one second packet. Here, the pre-set method may be assigning of the image transmitting points of time such that time intervals of transmitting I-frames of images obtained by thefirst terminal 100D and thesecond terminals - As described above, since capacity of an I-frame may be relatively large, a time interval of transmitting such I-frames may be set to be largest such that a network is not rapidly loaded beyond a design capacity.
- In
FIG. 5 , before thefirst terminal 100D is newly added as in atime line 501, a time interval of transmitting I-frames of thesecond terminals second terminal 100A may transmit the I-frame at a point of time corresponding to a slot 1 in one period T, and thesecond terminal 100B may transmit the I-frame at a point of time corresponding to a slot 7 in the period T. - However, when the
first terminal 100D is newly added, as in atime line 502, time intervals of transmitting I-frames of thefirst terminal 100D and thesecond terminals second terminal 100A may transmit the I-frame at the point of time corresponding to the slot 1 in the period T, thesecond terminal 100B may transmit the I-frame at a point of time corresponding to a slot 5 in the period T, and thefirst terminal 100D may transmit the I-frame at a point of time corresponding to a slot 9 in the period T. - According to such a structure, the
first terminal 100D and thesecond terminals external apparatus 200 through a network, and at this time, the period T may include 12 slots. Accordingly, the time intervals described above may vary according to a length of the period T and/or the number of terminals on the network. - The
first terminal 100D and thesecond terminals external apparatus 200 through the network. - The
controller 120 may broadcast a first packet, updated according to the above processes, to the network. Here, the updated first packet may include information about all items of a first packet, unlike in a first packet that is broadcast initially when thefirst terminal 100D is initially connected to the network. In other words, the updated first packet may include channels and updated time slots of thefirst terminal 100D and thesecond terminals - Upon receiving the updated first packet, the
second terminals - Since the updated first packet may be a packet requesting at least one terminal for a response packet (a second packet or a third packet as described below), the
second terminals controller 120 of thefirst terminal 100D may receive at least one third packet transmitted from at least one of thesecond terminals - The
controller 120 may determine a malfunction of the at least one of thesecond terminals controller 120 may determine that a certain terminal malfunctions when a third packet is not received from the certain terminal. Also, thecontroller 120 may determine that a certain terminal malfunctions when a time slot included in a third packet received from the certain terminal is different from a time slot included in the updated first packet. - The
controller 120 may repeatedly broadcast an updated first packet and receive a third packet as such, thereby periodically determining a malfunction of thesecond terminals -
FIGS. 6 and 7 are flowcharts of a network managing method performed by thecontroller 120, according to an exemplary embodiment of the invention. Hereinafter, details overlapping those described with reference toFIGS. 1 through 5 will not be repeated. - When the
first terminal 100C is connected to a network, thecontroller 120 of thefirst terminal 100C may broadcast a first packet to the network, in operation S61. - Herein, the broadcasting of the first packet may mean that the
first terminal 100C transmits the first packet to at least one terminal connected to the network. In other words, thefirst terminal 100C may transmit the first packet to the at least one terminal on the network to notify the at least one terminal that thefirst terminal 100C has been newly added. - Here, the first packet may be a packet requesting another at least one terminal on the network for a response packet (a second packet or a third packet described below). The first packet may include at least one of a channel of the
first terminal 100C that has been newly added, a channel of the other at least one terminal on the network, a time slot in which image transmitting points of time of terminals on the terminal are assigned, and an updating point of time of a master terminal. However, the first packet that is initially transmitted by thefirst terminal 100C when thefirst terminal 100C is newly added to the network may not include information about some of the above items. Information about items, which is not included in the first packet, may be updated based on a second packet received from another terminal on the network later, as will be described below. - The
controller 120 may receive a second packet in operation S62, which is transmitted by another terminal on the network in response to the first packet. Also, thecontroller 120 may update a master terminal and the first packet in operation S63, based on at least one of whether a second packet is received, information of thefirst terminal 100 C, and at least one second packet. - For example, the
controller 120 may determine whether a second packet is received within a pre-set time interval in operation S621, and when it is determined that the second packet is not received within the pre-set time interval, set thefirst terminal 100C as a master terminal in operation S634. As described above, when a second packet is not received within the pre-set time interval, thefirst terminal 100C may be an initial terminal connected to the network. - The
controller 120 may initialize the first packet based on information of thefirst terminal 100C. In other words, thecontroller 120 may assign a channel of thefirst terminal 100C in operation S635 and update a time slot in operation S636. - For example, the
controller 120 may initialize each item of the first packet to a blank and/or a very first setting value based on a premise that thefirst terminal 100C is one and only terminal existing on the network. For example, thecontroller 120 may set a first channel as a channel of thefirst terminal 100C by referring to channel information included in the first packet, and initialize remaining channels to blanks. Also, thecontroller 120 may assign a very first slot of the time slot included in the first packet to an image transmitting point of time of thefirst terminal 100C. - When it is determined that the second packet is received within the pre-set time interval in operation S621, the
controller 120 may set the first terminal 100D as a master terminal in operation S631. In other words, thecontroller 120 may set the first terminal 100D as a master terminal when at least one second packet is received. - Also, the
controller 120 may update the first packet based on information of thefirst terminal 100D and at least one second packet. For example, in operation S632, thecontroller 120 may assign a channel of thefirst terminal 100D based on the second packet. Here, thecontroller 120 may assign a channel of the other at least one terminal based on the second packet. - For example, referring to
FIG. 4 , thecontroller 120 of thefirst terminal 100D may assign an empty channel as the channel of thefirst terminal 100D by referring to the second packets transmitted by thesecond terminals second terminals controller 120 of thefirst terminal 100D may determine an empty channel by collecting at least one second packet and assign the empty channel as a channel of thefirst terminal 100D. - When the
first terminal 100D is added to replace an existing terminal due to malfunction of the existing terminal, thecontroller 120 may assign a channel of the existing terminal as the channel of thefirst terminal 100D. In this case, the ID information of thefirst terminal 100D may be identical to ID information of the existing terminal. When thefirst terminal 100D is added to expand a channel, thecontroller 120 may assign an empty channel that has not been assigned as the channel of thefirst terminal 100D. - In
FIG. 4 , thefirst terminal 100D is added to expand a channel, and thecontroller 120 may determine, based on the second packet received from thesecond terminal 100A, that thefirst channel 401 is assigned to thesecond terminal 100A. Also, thecontroller 120 may determine, based on the second packet received from thesecond terminal 100B, that thesecond channel 402 is assigned to thesecond terminal 100B. Accordingly, thecontroller 120 may set thethird channel 403 that is an empty channel as the channel of thefirst terminal 100D. In other words, thecontroller 120 may map thethird channel 403 and the ID information of thefirst terminal 100D. - The first packet may be updated by adding the mapped ID information. Here, the
controller 120 may update the first packet by adding mapping information of thefirst channel 401 and ID information of thesecond terminal 100A and mapping information of thesecond channel 402 and ID information of thesecond terminal 100B. - As such, according to an exemplary embodiment of the invention, a subject managing channels of terminals and a time slot may be set to be any one of the terminals such that a network is managed without a separate managing subject.
- In addition, according to an exemplary embodiment of the invention, by continuously updating a managing subject, deterioration of a certain terminal may be prevented and a load may be distributed.
- Also, according to an exemplary embodiment of the invention, channel information is used such that a new terminal is easily added when an existing terminal malfunctions.
- Referring to
FIG. 7 , thecontroller 120 may update a time slot in which an image transmitting point of time of the other at least one terminal and an image transmitting point of time of thefirst terminal 100D are assigned according to a pre-set method, based on the at least one second packet, in operation S633. - For example, referring to
FIG. 5 , thecontroller 120 may update the time slot in which the image transmitting points of time of thesecond terminals first terminal 100D are assigned according to the pre-set method, based on the at least one second packet. Here, the pre-set method may include assigning of the image transmitting points of time such that time intervals of transmitting I-frames of images obtained by thefirst terminal 100D and thesecond terminals - As described above, since the capacity of an I-frame may be relatively large, a time interval of transmitting such I-frames may be set to be largest such that a network is not rapidly loaded beyond a design capacity.
- In
FIG. 5 , before thefirst terminal 100D is newly added as in thetime line 501, the time interval of transmitting the I-frames of thesecond terminals second terminal 100A may transmit the I-frame at a point of time corresponding to the slot 1 in the period T, and thesecond terminal 100B may transmit the I-frame at a point of time corresponding to the slot 7 in the period T. - However, when the
first terminal 100D is newly added as in thetime line 502, the time intervals of transmitting the I-frames of thefirst terminal 100D and thesecond terminals second terminal 100A may transmit the I-frame at the point of time corresponding to the slot 1 in the period T, thesecond terminal 100B may transmit the I-frame at a point of time corresponding to the slot 5 in the period T, and thefirst terminal 100D may transmit the I-frame at a point of time corresponding to the slot 9 in the period T. - According to such a structure, the
first terminal 100D and thesecond terminals external apparatus 200 through a network, and at this time, the period T may include 12 slots. Accordingly, the time intervals described above may vary according to a length of the period T and/or the number of terminals on the network. - The
first terminal 100D and thesecond terminals external apparatus 200 through the network. - The
controller 120 may broadcast the first packet updated according to above processes, to the network, in operation S64. Here, the updated first packet may include information about all items of a first packet, unlike in a first packet that is broadcast initially when thefirst terminal 100D is initially connected to the network. - The
second terminal - Since the updated first packet may be a packet requesting at least one terminal for a response packet (a second packet or a third packet as described below), the
second terminal - In other words, the
controller 120 of thefirst terminal 100D may receive at least one third packet transmitted from at least one of terminals on the network in response to the updated first packet, in operation S65. - The
controller 120 may determine malfunction of the at least one of the terminals that transmitted the at least one third packet based on the received at least one third packet. For example, thecontroller 120 may determine that a certain terminal malfunctions when a third packet is not received from the certain terminal. Also, thecontroller 120 may determine that a certain terminal malfunctions when a time slot included in a third packet received from the certain terminal is different from a time slot included in the updated first packet. - The
controller 120 may repeatedly broadcast an updated first packet and receive a third packet as such, thereby periodically determining malfunction of another terminal. - <Second Terminal>
- Hereinabove, a first terminal that broadcasts a first packet to a network has been described. Now, a second terminal that receives the first packet broadcast by the first terminal and transmits a second packet to the first terminal in response to the first packet will be described.
- As described above, the first terminal may be a terminal newly added to the network, and the second terminal may be a terminal pre-existing in the network. However, herein, the first and second terminals are classified according to functions for convenience of description, and thus, may have the same structure as each other.
-
FIG. 8 is a flowchart of a network managing method performed by a controller of a second terminal, according to an exemplary embodiment of the invention. - The controller of the second terminal may receive a first packet broadcast by a first terminal through a network, in operation S81. Also, the controller may update a time slot based on the received first packet in operation S82.
- As described above, the first terminal updates the first packet and broadcasts the updated first packet to the network, and thus the controller may receive such an updated first packet and update the time slot of the second terminal by referring to a time slot in the received first packet.
- For example, when a current time slot of the second terminal and the times slot in the received first packet are different from each other, the controller may update the current time slot of the second terminal to the time slot in the received first packet. In other words, when the first terminal is added to the network, the controller of the second terminal may update its time slot by referring to the time slot of the first terminal, which has been newly assigned according to the addition of the first terminal to the network.
- For example, as shown in
FIG. 5 , assume that the time slots of thesecond terminals time line 501 before thefirst terminal 100D is newly added. In other words, the time interval of transmitting the I-frames of thesecond terminals - Here, when the
first terminal 100D is newly added, as shown in thetime line 502, thesecond terminals first terminal 100D, and update the time slot by referring to the updated first packet. In other words, the time slot of thesecond terminals first terminal 100D and thesecond terminals - Then, the controller of the second terminal may transmit, to the first terminal, a second packet including at least one of the updated time slot and a channel of the second terminal, in operation S83. The transmitted second packet may be used by the first terminal to determine malfunction of the second terminal.
- The controller of the second terminal may determine whether a master terminal satisfies a master terminal changing condition. For example, when a master terminal is changed at regular time periods according to an order of channels, the master terminal changing condition may be a lapse of a certain period of time.
- When the master terminal satisfies the master terminal changing condition, the controller of the second terminal may transmit a fourth packet to the master terminal. Here, the fourth packet may include at least one of a channel of the second terminal and information about changing of a master terminal.
- Then, the controller of the second terminal may update the master terminal to the second terminal, update the first packet based on information of the second terminal, and broadcast the updated first packet to the network. The updating of the master terminal, the updating of the first packet, and the broadcasting of the updated first packet, which are performed by the controller, have been described above, and thus details thereof are not provided again.
- According to exemplary embodiments of the invention, by distributing points of time when a plurality of image obtaining apparatuses transmit I-frames, a network managing method and an image obtaining apparatus, which efficiently use a network, may be realized.
- Also, a network managing method and an image obtaining apparatus, which manage a network by only using an image obtaining apparatus without a separate managing subject, may be realized.
- Also, a network managing method and an image obtaining apparatus, which prevent deterioration of a certain image obtaining apparatus by continuously updating a managing subject, may be realized.
- The network managing method according to the inventive concepts may also be embodied as computer-readable codes on a non-transitory computer-readable recording medium. The non-transitory computer-readable recording medium is any data storage device that can store data which can be thereafter read by a computer system. Examples of the non-transitory computer-readable recording medium include read-only memory (ROM), random-access memory (RAM), CD-ROMs, magnetic tapes, floppy disks, optical data storage devices, etc. The non-transitory computer-readable recording medium can also be distributed over network coupled computer systems so that the computer-readable code is stored and executed in a distributed fashion. Also, functional programs, codes, and code segments for accomplishing the present disclosure can be easily construed by programmers skilled in the art to which the present disclosure pertains.
- It should be understood that exemplary embodiments of the invention described herein should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each embodiment should typically be considered as available for other similar features or aspects in other embodiments.
- While one or more exemplary embodiments of the invention have been described with reference to the figures, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the following claims.
Claims (20)
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US20220417307A1 (en) | 2022-12-29 |
US11595455B2 (en) | 2023-02-28 |
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