WO2014061181A1 - カメラシステム - Google Patents
カメラシステム Download PDFInfo
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- WO2014061181A1 WO2014061181A1 PCT/JP2013/004859 JP2013004859W WO2014061181A1 WO 2014061181 A1 WO2014061181 A1 WO 2014061181A1 JP 2013004859 W JP2013004859 W JP 2013004859W WO 2014061181 A1 WO2014061181 A1 WO 2014061181A1
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- bit rate
- camera
- variable bit
- rate encoding
- encoding method
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/917—Television signal processing therefor for bandwidth reduction
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/115—Selection of the code volume for a coding unit prior to coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- H04N19/157—Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
- H04N19/16—Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter for a given display mode, e.g. for interlaced or progressive display mode
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- H04N19/164—Feedback from the receiver or from the transmission channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/179—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a scene or a shot
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/66—Remote control of cameras or camera parts, e.g. by remote control devices
- H04N23/661—Transmitting camera control signals through networks, e.g. control via the Internet
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/90—Arrangement of cameras or camera modules, e.g. multiple cameras in TV studios or sports stadiums
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
- H04N5/77—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television camera
Definitions
- the present invention relates to a camera system, a camera system control method, a receiving apparatus, and a program including a plurality of cameras and a receiving apparatus that receives their video signals via a network.
- a first related technique related to the present invention setting the encoding bit rate of each camera so that the sum of the encoding bit rates of the video signals of all cameras does not exceed a predetermined network bandwidth. It has been proposed (see, for example, Patent Document 1).
- a provisional encoding bit rate is determined for each camera according to the display window size.
- a bit rate allocation ratio of each camera is calculated based on the determined encoding bit rate, and a predetermined network bandwidth is allocated with the calculated bit rate allocation ratio of each camera, Determine the encoding bit rate of the camera.
- the provisional encoding bit rate is determined for each camera according to the display window size, and then the total of the provisional encoding bit rates determined for the cameras with high priority is the predetermined value.
- the provisional encoding bit rate of the camera with high priority is determined as the encoding bit rate, and the encoding bit rates of the other cameras are determined from the remaining bandwidth.
- a second related technique related to the present invention is to provide an alarm function on the camera side and transmit and record the video signal of the camera to the monitoring device through the network only during the time zone when the alarm state is detected. (See, for example, Patent Document 2).
- VBR Very Bit Rate
- An object of the present invention is to solve the above-described problem, that is, a method of statically allocating a network band to each camera so that the sum of encoding bit rates of video signals of all cameras does not exceed a predetermined network band.
- the object is to provide a camera system that solves the problem that the available network bandwidth cannot be used effectively.
- a camera system includes: A plurality of cameras that encode and transmit a video signal obtained by photographing with one variable bit rate encoding method among a plurality of variable bit rate encoding methods each having a different average bit rate; A receiver connected to the plurality of cameras via a network; The receiving device is A measurement unit that periodically measures the total bandwidth of the video signal received from the plurality of cameras via the network; When the total bandwidth of the measured video signal exceeds a first threshold, the variable bit rate encoding method used by the camera is switched to a lower average bit rate, and the measured video signal And a control unit that switches the variable bit rate encoding method used in the camera to a higher average bit rate when the total bandwidth falls below a second threshold value that is equal to or less than the first threshold value.
- a receiving apparatus provides: Connected via a network to multiple cameras that encode and transmit video signals obtained by shooting using one of the variable bit rate encoding methods with different average bit rates. And A measurement unit that periodically measures the total bandwidth of the video signal received from the plurality of cameras via the network; When the total bandwidth of the measured video signal exceeds a first threshold, the variable bit rate encoding method used by the camera is switched to a lower average bit rate, and the measured video signal And a control unit that switches the variable bit rate encoding method used in the camera to a higher average bit rate when the total bandwidth falls below a second threshold value that is equal to or less than the first threshold value.
- a camera system control method is: Each of a plurality of cameras encodes a video signal obtained by photographing with one variable bit rate encoding method among a plurality of variable bit rate encoding methods having different average bit rates, and transmits the video signal via a network.
- the receiver periodically measures the total bandwidth of the video signal received from the plurality of cameras via the network, If the total bandwidth of the measured video signal exceeds the first threshold, the receiver switches the variable bit rate encoding method used by the camera to a lower average bit rate, When the total bandwidth of the measured video signal is lower than a second threshold value that is equal to or less than the first threshold value, the receiving device has a higher average bit rate than the variable bit rate encoding method used in the camera.
- a program is: Connected via a network to multiple cameras that encode and transmit video signals obtained by shooting using one of the variable bit rate encoding methods with different average bit rates.
- Computer A measurement unit that periodically measures the total bandwidth of the video signal received from the plurality of cameras via the network; When the measured total bandwidth of the video signal exceeds a first threshold, the variable bit rate encoding method used in the camera is switched to a lower average bit rate, and the measured video signal When the total bandwidth falls below a second threshold value that is equal to or less than the first threshold value, the variable bit rate encoding method used in the camera is made to function as a control unit that switches to a higher average bit rate.
- the present invention Since the present invention has the above-described configuration, it can be controlled so that the sum of the encoding bit rates of the video signals of all the cameras does not exceed a predetermined network bandwidth, and when the network bandwidth is vacant.
- the free network bandwidth can be used effectively.
- a camera system 100 includes a plurality of cameras 101 and a receiving device 103 connected to the plurality of cameras 101 via a network 102.
- the camera 101 is a network camera, and there are a total of n cameras (n is an integer of 2 or more). Each camera 101 has a function of encoding a video signal obtained by photographing using one variable bit rate encoding method among a plurality of variable bit rate encoding methods having different average bit rates. Each camera 101 has a function of transmitting the encoded video signal to the receiving device 103 via the network 102.
- variable bit rate encoding schemes having different average bit rates for example, a reference variable bit rate encoding scheme (for example, MPEG-4 AVC) and a reference variable bit rate encoding scheme can be used.
- a variable bit rate encoding method with changed parameters can be considered. For example, when the frame rate can be set by a parameter, the average bit rate is reduced in the variable bit rate encoding method in which the frame rate is halved compared to the reference variable bit rate encoding method.
- the variable bit rate encoding method in which black and white video is used when the standard variable bit rate encoding method is color video is used. The average bit rate is reduced.
- the average bit rate is reduced in the variable bit rate encoding method that performs rough quantization compared to the reference variable bit rate encoding method.
- the average bit rate can be set by a parameter, a plurality of variable bit rate encoding schemes having different average bit rates can be realized by changing the setting of the average bit rate.
- FIG. 2 is a block diagram showing an example of the hardware configuration of the camera 101.
- the camera 101 in this example includes an imaging unit 111, a preprocessing unit 112, an encoder 113, a communication interface (communication I / F) 114, an operation unit 115, a control unit 116, and a control bus 117.
- the imaging unit 111 includes an imaging lens and an imaging element such as a CCD (Charged Coupled Device) or a CMOS (Complementary Metal-Oxide Semiconductor), and outputs an analog video signal corresponding to the captured image to the preprocessing unit 112.
- CCD Charge Coupled Device
- CMOS Complementary Metal-Oxide Semiconductor
- the preprocessing unit 112 converts the analog video signal into a digital signal, performs white balance adjustment and the like, generates a video frame, and outputs the video frame to the encoder 113.
- the encoder 113 performs a data compression process on the video frame by a variable bit rate coding method, and outputs a video signal encoded to the communication I / F unit 114.
- the communication I / F unit 114 transmits the encoded video signal to the receiving device 103 and receives an encoding method switching instruction or the like from the receiving device 103.
- the operation unit 115 receives various operations from the user and transmits them to the control unit 116.
- the control unit 116 includes an MPU that controls each unit in the camera 101, a ROM and a RAM that store programs, and the like.
- control unit 116 receives an instruction to switch the encoding method from the receiving apparatus 103 received by the communication I / F unit 114 via the control bus 117, and converts the variable bit rate encoding method used by the encoder 113 to an average. Control is performed to switch to another variable bit rate encoding method having a different bit rate.
- the receiving apparatus 103 includes a measuring unit 104 and a control unit 105.
- the measuring unit 104 of the receiving device 103 has a function of periodically measuring the total bandwidth of video signals received from a plurality of cameras 101 via the network 102.
- the control unit 105 of the receiving apparatus 103 is determined based on the total bandwidth of the video signals of the plurality of cameras 101 measured by the measurement unit 104 and the bandwidth of the network 102 that can be used to receive the video signals from the plurality of cameras 101. Based on the threshold values (first and second threshold values), it has a function of switching the variable bit rate encoding method used by each camera 101.
- the control unit 105 determines that the total bandwidth of the video signal is below the first threshold when the total bandwidth of the measured video signal exceeds the first threshold set to a predetermined network bandwidth or less.
- the camera 101 has a function of switching the variable bit rate encoding method used by the camera 101 to one having a lower average bit rate.
- the control unit 105 preferably switches the variable bit rate encoding method used by the camera 101 to a lower average bit rate in order from the camera 101 having the lower priority.
- the priority may be determined for each camera, or may be determined for each combination of the camera and the variable bit rate encoding method. The priority may be determined statically or may be determined dynamically.
- the control unit 105 determines that the variable bit rate encoding method being used is other than the highest average bit rate.
- the function is to switch the variable bit rate encoding method used by the camera 101 to a higher average bit rate with the switched camera 101 as a switching target.
- the control unit 105 preferably switches the variable bit rate encoding method used by the camera 101 to a higher average bit rate in order from the camera 101 having the higher priority.
- FIG. 3 is a block diagram illustrating an example of a hardware configuration of the receiving apparatus 103.
- the receiving apparatus 103 in this example includes a communication I / F unit 121, a recording / playback unit 122, a storage 123, a band measurement unit 124, a display unit 125, an operation unit 126, a control unit 127, and a control bus 128.
- the communication I / F unit 121 receives video signals encoded from the plurality of cameras 101 via the network 102, outputs them to the recording / playback unit 122 and the band measurement unit 124, and receives them from the control unit 127 through the control bus 128.
- the encoding mode switching instruction is transmitted via the network 102 to the designated destination camera 101.
- the display unit 125 is configured by a liquid crystal display or the like.
- the storage 123 is composed of a magnetic disk device or the like.
- the recording / playback unit 122 records (records) the encoded video signal input from the communication I / F unit 121 in the storage 123 for each camera, and the encoded video signal input from the communication I / F unit 121.
- the signal or the video signal read from the storage 123 is decoded and displayed on the screen of the display unit 125.
- the band measurement unit 124 periodically measures the band of the encoded video signal input from the communication I / F unit 121 and notifies the control unit 127 of the measurement result through the control bus 128.
- the band measuring unit 124 corresponds to the measuring unit 104 in FIG.
- the operation unit 126 receives various operations from the user and transmits them to the control unit 127.
- the control unit 127 includes an MPU that controls each unit in the receiving apparatus 103, a ROM, a RAM, and the like that store programs, control data, and the like.
- the control unit 127 corresponds to the control unit 105 in FIG.
- the measurement unit 104 in FIG. 1 is realized by hardware.
- the measurement unit 104 in FIG. 1 can be realized by a processor such as an MPU and a program.
- FIG. 4 is a flowchart showing an example of the operation of each camera 101
- FIG. 5 is a flowchart showing an example of the operation of the receiving apparatus 103.
- Each of the cameras 101 selects a variable bit rate encoding method to be used first (S101). It is arbitrary which one of a plurality of variable bit rate coding systems having different average bit rates is selected as the first one to be used. Here, it is assumed that the variable bit rate encoding method having the highest average bit rate is selected as the first one to be used.
- the camera 101 encodes the video obtained by shooting using the currently selected variable bit rate encoding method, and transmits the encoded video to the receiving device 103 via the network 102 (S102).
- the camera 101 determines whether or not a message instructing switching of the variable bit rate encoding method has been received from the receiving apparatus 103 via the network (S103). If a message instructing switching of the variable bit rate encoding method is received, the variable bit rate encoding method that is currently used is switched to another variable bit rate encoding method in accordance with the received message (S104). Return to processing. On the other hand, if a message for instructing switching of the variable bit rate encoding method has not been received, the process of step S104 is skipped and the process returns to step S102.
- each camera 101 encodes a video signal obtained by photographing using one variable bit rate encoding method among a plurality of variable bit rate encoding methods having different average bit rates, and An operation of transmitting to the receiving apparatus 103 via 102 is performed.
- the measuring unit 104 of the receiving apparatus 103 periodically measures the total bandwidth (hereinafter referred to as total bandwidth ABW) of video signals received from the plurality of cameras 101 via the network 102.
- the period to measure is arbitrary. For example, it may be every 30 seconds, every minute, every few minutes, or the like.
- the total bandwidth ABW of the video signal measured by the measurement unit 104 is notified to the control unit 105.
- control unit 105 of the receiving apparatus 103 will be described with reference to FIG. 1 and FIG.
- the control unit 105 of the receiving apparatus 103 compares the total bandwidth ABW of the video signal measured by the measurement unit 104 with a threshold value SH1 set in advance in a memory or the like, and determines whether the total bandwidth ABW exceeds the threshold value SH1. Determination is made (S111).
- the threshold SH1 is set to a band that is the same as or slightly narrower than the band of the network 102 that can be used to receive video signals from the plurality of cameras 101.
- the control unit 105 performs the following control in order to reduce the band of the received video signal.
- the control unit 15 selects a camera 101 to be an encoding bit rate reduction target based on the priority of each camera 101 (S112).
- the control unit 105 switches the variable bit rate encoding method used by the selected camera 101 to a variable bit rate encoding method having a lower average bit rate (S113).
- the control unit 105 transmits a message instructing the selected camera 101 to switch to a variable bit rate encoding method having a lower average bit rate.
- the control unit 15 again compares the total band ABW of the video signal notified from the measurement unit 104 with the threshold value SH1 (S114).
- the control unit 115 repeats the loop processing of steps S112 to S114 until the total band ABW of the video signal measured by the measurement unit 104 falls below the threshold value SH1. Then, when detecting that the total band ABW of the video signal has fallen below the threshold value SH1, the control unit 115 returns to the process of step S111.
- the ratio of the cameras 101 operating with the variable bit rate encoding method having a lower average bit rate is increased.
- the total bandwidth ABW of the video signals transmitted from the plurality of cameras 101 is controlled to be equal to or less than the threshold value SH1.
- control unit 105 detects that the total band ABW of the video signal measured by the measurement unit 104 does not exceed the threshold value SH1, the control unit 105 compares the total band ABW of the video signal with the threshold value SH2 (S115).
- the threshold value SH2 is set to a value smaller than the threshold value SH1. If the total band ABW of the video signal is not less than the threshold value SH2, the process returns to step S111. On the other hand, if the total band ABW of the video signal is less than the threshold value SH2, the control unit 105 determines whether or not the current state is a bit rate reduction (step S116).
- bit rate being reduced means that there is one or more cameras 101 that are switched to a variable bit rate encoding method to be used other than the one having the highest average bit rate. If the bit rate is not being reduced, the control unit 115 returns to the process of step S111.
- control unit 115 performs the following control in order to effectively use the free network bandwidth.
- the control unit 115 switches from the camera 101 whose variable bit rate encoding method used is switched to one other than the one having the highest average bit rate to a variable bit rate encoding method having a higher average bit rate. 101 is selected based on the priority (S117). Next, the control unit 115 switches the variable bit rate encoding method used by the selected camera 101 to a higher average bit rate (S118). Specifically, the control unit 105 transmits a message instructing the selected camera 101 to switch to a variable bit rate encoding method having a higher average bit rate. Next, the control unit 15 again compares the total band ABW of the video signal notified from the measurement unit 104 with the threshold value SH2 (S119).
- the control unit 115 repeats the loop processing of steps S117 to S119 until the total band ABW of the video signal measured by the measurement unit 104 becomes equal to or greater than the threshold value SH2. Then, when detecting that the total band ABW of the video signal is equal to or greater than the threshold value SH2, the control unit 115 returns to the process of step S111.
- FIG. 6 schematically shows an example of the transition of the operation state of the camera 101.
- the low priority is given at time t2.
- a part of the camera 101 is switched to a state in which the variable bit rate encoding method having the second highest average bit rate is used.
- all of the low priority cameras 101 are switched to a state where the variable bit rate encoding method having the lowest average bit rate is used.
- the high-priority camera 101 is still operating using the variable bit rate encoding method with the highest average bit rate. Therefore, the quality of the transmission video of the high priority camera 101 does not deteriorate.
- the measurement unit 104 of the reception device 103 periodically measures the total bandwidth of the video signals received from the plurality of cameras 101 via the network 102, and the control unit 105 of the reception device 103 performs the above measurement.
- the threshold SH1 equal to or less than the predetermined network bandwidth
- the variable bit rate encoding method used by the camera 101 has a lower average bit rate until the total bandwidth of the video signal falls below the threshold SH1. It is for switching to.
- the vacant network band when a vacant network band is generated, the vacant network band can be used effectively.
- the measurement unit 104 of the reception device 103 periodically measures the total bandwidth of the video signals received from the plurality of cameras 101 via the network 102, and the control unit 105 of the reception device 103 performs the above measurement.
- the camera 101 uses the variable bit rate encoding method used by the camera 101 as a switching target other than the one with the highest average bit rate. This is to switch the variable bit rate encoding method to a higher average bit rate.
- the present embodiment when the total bandwidth of the video signal of the entire camera is reduced, it is possible to prevent the quality of the video signal of the camera having a high priority from being deteriorated similarly to the camera having a low priority. The reason is that the cameras are switched to the variable bit rate encoding method having a lower average bit rate in order from the camera with the lower priority.
- the quality of the video signal of the high priority camera can be improved before the low priority camera.
- the reason is that the cameras are switched to the variable bit rate encoding method with the higher average bit rate in order from the camera with the higher priority.
- the video group is controlled by controlling the network camera recording method based on the video content so as not to exceed the allowable network reception. Network bandwidth can be reduced without reducing the information level obtained from the network.
- FIG. 7 is a block diagram showing the overall configuration of the camera system 200 according to the present embodiment.
- the network camera captures the video, encodes it including compression, and sends the encoded video data to the recording unit of the recording device 2.
- the recording device 2 includes a recording unit 21, a recording band measurement unit 22, a recorded video priority determination unit 23, a recording instruction unit 25, and an execution priority table 26.
- the recording band measurement unit 22 corresponds to the measurement unit 104
- the recorded video priority determination unit 23, the priority table 26, and the recording instruction unit 25 correspond to the control unit 105.
- the recording unit 21 receives and records the video data of the network cameras 11 to 1n.
- the recording bandwidth measuring unit 22 measures the bandwidth of each network camera that is recorded by the recording unit 21.
- the recorded video priority determination unit 23 uses the execution priority table 26 to determine a network camera for reducing the bandwidth and a method for reducing the bandwidth.
- the recording instruction unit 25 instructs the corresponding network camera on the method determined by the recorded video priority determination unit 23.
- the execution priority table 26 stores information for determining whether to reduce the bandwidth of the network camera.
- FIG. 8 is an example of the implementation priority table 26. It includes an ID for identifying a network camera and an execution priority for which priority is to be applied to a technique for reducing some frame rates.
- the network camera ID may be any information that can be specified, and may be a number or a unique name.
- This example describes three types: whether to implement frame rate halving, whether to implement black and white, and whether to implement image quality reduction (for example, changing the quantization step size to the extent that the bit rate is halved). However, there is no particular limitation to these methods as long as it is a means for lowering the video bit rate. It is assumed that the execution priorities are executed in descending order, and that the method is not executed when the priority is 0.
- the priority according to the importance of the video of each network camera and the characteristics of the monitoring video object and the execution priority described in the execution priority table 26 of FIG. 8 are not the same and conflict with each other. That is, the importance of the video is lower as the network camera is given a higher execution priority.
- FIG. 9 is an example of a network camera configuration that is a precondition for setting the execution priority table 26. It is assumed that the network cameras 1, 2, and 3 are installed in the same area, and the video displayed by the network camera 2 is reflected in either the network camera 1 or the network camera 3. In that case, even if the video quality of the network camera 2 is lowered, it can be interpolated with the video of the network camera 1 and the network camera 3, and therefore it is considered that there is almost no influence on the information level obtained from the entire video group. That is, the network camera 2 is less important than the network cameras 1 and 3.
- the video of the network camera 2 may be first black and white, for example, so that the maximum priority 1000 in this table is assigned, then the frame rate is lowered, and the image quality is lowered.
- the table is configured based on the judgment that it is acceptable. In consideration of the case where the bandwidth has to be further reduced, assuming that the network camera in the same area can be interpolated if one color video is available, the network camera 3 is monochrome. It is set because it can be. In addition, in consideration of lowering the worst image quality, the option of halving the bit rate is left as an example.
- FIG. 10 is an explanatory diagram of the operation of this embodiment.
- the recording unit 21 receives and records the video distributed from the network cameras 11 to 1n.
- step A2 the recording bandwidth measuring unit 22 periodically checks the bandwidths of all the network cameras 11 to 1n. For example, every other minute. While checking each band, a total band that is the sum of each band is calculated.
- a threshold value (hereinafter referred to as a first threshold value) that can ensure the bandwidth reliably is determined in advance based on the allowable amount of the network distributed from the network camera to the recording device 2.
- the first threshold value may be fixed, for example, when a predetermined bandwidth is assumed in the intranet.
- the recorded video priority determination unit 23 extracts a bit rate reduction method to be performed next from the network cameras currently recorded based on the execution priority.
- the execution priority is defined in advance for each network camera and for each bit rate reduction method, and is provided as the execution priority table 26.
- the recorded video priority determination unit 23 looks at the execution priority of this table, and lowers the bit rate in order from the highest execution priority. In practice, the recorded video priority determination unit 23 stores which execution priority method is currently being executed by itself, and the network camera with the next highest execution priority (hereinafter referred to as network camera X). ) And extract methods. If a large number of network cameras are being implemented, the size of the implementation priority table 26 increases. However, since this is not large compared to the processing amount of video data, this table is also considered to function. However, in order to further increase the speed, it is possible to sort the network camera IDs in the table and improve the searchability with a hash using the network camera ID as a key.
- step A5 the network camera X is instructed to the method determined in step A4, and the network camera X follows it.
- the bit rate can be reduced according to the characteristics of the video, and the reduction of the information level obtained from the video group as a whole can be suppressed.
- a threshold for determining that the total bandwidth received from the network camera has a sufficient margin and the distribution bandwidth (hereinafter referred to as a second threshold). For example) is specified in advance.
- Step A11 it is determined whether or not the total bandwidth is below the second threshold value, that is, whether or not there is room in the bandwidth. If it is below the second threshold, as a step A12, contrary to step A4, the recorded video priority determination unit 23 has a higher priority network camera among the cameras whose video quality has already been lowered (hereinafter referred to as the step A4). 8), the recording instruction unit 25 returns the network camera Y to a better video quality state as step A13.
- the total bandwidth of network camera recording can be suppressed, and it is not necessary to construct a network in consideration of the case where all network cameras use the maximum bandwidth, and the network construction cost can be reduced.
- the present embodiment in order to suppress the bandwidth of some network cameras according to the importance of the network cameras and the video content, the number of network cameras that affect the video and the information level quality obtained from the video group Reduction can be reduced.
- the band limiting method is instructed on the recording apparatus side, but in this embodiment, it is determined on the network camera side.
- FIG. 11 is a block diagram of the camera system 300 according to the present embodiment.
- 23A is a recorded video priority determining unit
- 26A is an implementation priority table
- 241 is a recorded video determining unit. It is.
- a recorded video determination unit 241 is newly provided on the network camera side.
- the recorded video priority determination unit 23A of the recording device 2 does not manage a method for reducing the bandwidth, selects a network camera for reducing the bandwidth with reference to the implementation priority table 26A, and the recording instruction unit 25 is selected. Instruct the network camera to lower the bandwidth.
- the execution priority table 26A describes the execution priority for each network camera as shown in FIG.
- the bandwidth reduction method is left to the recorded video determination unit 241 in the network camera.
- the recorded video determination unit 241 determines that the video has poor motion when the difference for each video frame (for example, simply digitizing the color of each point and summing up the differences) does not exceed a specified value. Then, bandwidth control is performed based on a rule that can be determined by the camera such as lowering the frame rate.
- the priority of the camera or the implementation priority of the bandwidth reduction is determined in advance.
- the priority of the camera or the implementation priority of the bandwidth reduction is not set in advance and is recorded. Dynamically determined from the characteristics of the video.
- FIG. 13 is a block diagram of the camera system 400 according to the present embodiment.
- the same reference numerals as those in FIG. 7 denote the same parts, and 24 denotes a recorded video determination unit.
- the recorded video determination unit 24 dynamically determines the priority of each network camera or the priority for bandwidth reduction by analyzing the video recorded by each network camera. For example, when there is no motion in the video encoded by the network camera, even if the frame rate is lowered, there is almost no influence on the actual viewing. Therefore, the recorded video determination unit 24 determines that the video is not moving when the difference for each video frame (for example, simply digitizing the color of each point and summing up the differences) does not exceed the specified value.
- the network camera transmitting the video frame is determined to be a network camera with a low priority, and an instruction to lower the frame rate is given to the network camera through the recording instruction unit 25.
- the network camera bandwidth reduction priority is determined as fixed in advance, but in the present embodiment, it is dynamically changed.
- FIG. 14 is a block diagram of the camera system 500 according to the present embodiment.
- the video priority determination unit 28 refers to the information in the priority determination information table 27 and dynamically changes the execution priority table 26.
- FIG. 15 is an example of the priority determination information table 27.
- a priority time zone is recorded for each network camera.
- the video priority determination unit 28 checks the time, and when the priority time is exceeded, for example, the video priority determination unit 28 equals each execution priority in the execution priority table 26 of the network camera. Conversely, when the priority time is reached, the execution priority is returned to the original state. In this way, for example, it is possible to cope with, for example, reducing the bit rate of the video of the camera in a time zone that does not need to be monitored, and the information level obtained from the entire video group can be maintained.
- the method of dynamically changing the execution priority is not limited to the above.
- the video priority determination unit 28 moves the execution priority table 26 based on the result of analyzing the video signal recorded in the recording unit 21 or based on the result and information in the priority determination information table 27. You may make it change automatically.
- the first threshold value for starting band limitation and the second threshold value for determining whether or not to cancel the band are set. Dynamically determined according to fluctuations in the usable bandwidth of the network.
- FIG. 16 is a block diagram of the camera system 600 according to the present embodiment, where the same reference numerals as those in FIG. 7 denote the same parts, and reference numeral 3 denotes a band threshold value judging device.
- the bandwidth threshold determination device 3 measures the allowable communication bandwidth of the network every minute, for example, and 80% of the bandwidth is used as the first threshold used in step A3 of FIG. 10, and 50% of the bandwidth is determined as the step of FIG.
- the second threshold used in A11 the recorded video priority determination unit 23 of the recording device 2 is notified. As a result, it is possible to cope with a case where the usable bandwidth of the network fluctuates.
- each of the above embodiments may have a mechanism for recording normal quality video on the network camera side so that normal quality video can be obtained even when the bandwidth is reduced.
- the present invention can be used for video surveillance and the like for recording or displaying a plurality of camera videos simultaneously.
- a part or all of the above embodiments can be described as in the following supplementary notes, but is not limited thereto.
- Appendix 1 A plurality of cameras that encode and transmit a video signal obtained by photographing with one variable bit rate encoding method among a plurality of variable bit rate encoding methods each having a different average bit rate;
- a receiving device connected to the plurality of cameras via a network;
- the receiving device is: A measurement unit that periodically measures the total bandwidth of the video signal received from the plurality of cameras via the network; If the measured total bandwidth of the video signal exceeds a first threshold, the variable bit rate encoding method used by the camera is averaged until the total bandwidth of the video signal falls below the first threshold.
- variable bit rate encoding method used by the camera is changed to the average bit.
- the plurality of variable bit rate encoding schemes having different average bit rates include a first variable bit rate encoding scheme and a second variable bit rate encoding scheme that reduces the frame rate by half compared to the first variable bit rate encoding scheme.
- the camera system according to appendix 1 or 2 including any two of the first variable bit rate encoding scheme and a fourth variable bit rate encoding scheme having a different quantization step size.
- [Appendix 4] The camera system according to supplementary note 2, wherein the priority is set in advance for a combination of the camera and the variable bit rate encoding method.
- [Appendix 5] The camera system according to attachment 2 or 4, wherein the control unit changes the priority according to information on a priority time zone for each camera.
- [Appendix 6] The camera system according to appendix 2 or 4, wherein the control unit determines the priority according to a degree of change in a video signal received from the camera.
- [Appendix 7] The bandwidth threshold determination device for measuring the usable bandwidth of the network and determining the first threshold and the second threshold according to the measurement result, The bandwidth threshold determination device according to any one of appendices 1 to 6 Camera system.
- Appendix 8 The camera system according to any one of appendices 1 to 7, wherein the receiving device further includes a recording unit that records the video signal received from the camera.
- Appendix 9 Connected via a network to multiple cameras that encode and transmit video signals obtained by shooting using one of the variable bit rate encoding methods with different average bit rates. And A measurement unit that periodically measures the total bandwidth of the video signal received from the plurality of cameras via the network; If the measured total bandwidth of the video signal exceeds a first threshold, the variable bit rate encoding method used by the camera is averaged until the total bandwidth of the video signal falls below the first threshold.
- variable bit rate encoding method used by the camera is changed to the average bit.
- a control unit configured to switch the variable bit rate encoding method used by the camera to a higher average bit rate for the camera that has been switched to other than the highest rate.
- the plurality of variable bit rate encoding schemes having different average bit rates include a first variable bit rate encoding scheme and a second variable bit rate encoding scheme that reduces the frame rate by half compared to the first variable bit rate encoding scheme.
- the receiving apparatus according to appendix 9 or 10 including any two of the first variable bit rate encoding scheme and a fourth variable bit rate encoding scheme having a different quantization step size.
- [Appendix 12] The receiving apparatus according to appendix 10, wherein the priority is set in advance for a combination of the camera and the variable bit rate encoding method.
- Appendix 13 The receiving device according to attachment 10 or 12, wherein the control unit changes the priority according to information on a priority time zone for each camera.
- Appendix 14 The receiving device according to appendix 10 or 12, wherein the control unit determines the priority according to a degree of change in a video signal received from the camera.
- Any one of appendices 9 to 14, further connected to a bandwidth threshold determination device that measures the usable bandwidth of the network and determines the first threshold and the second threshold according to the measurement result The receiving device described in 1.
- the receiver periodically measures the total bandwidth of the video signal received from the plurality of cameras via the network,
- the variable bit rate encoding used by the camera until the total bandwidth of the video signal falls below the first threshold when the total bandwidth of the measured video signal exceeds the first threshold Switch the method to one with a lower average bit rate, When the total bandwidth of the measured video signal is less than a second threshold value equal to or less than the first threshold value, the variable bit rate encoding method used by the camera has the highest average bit rate.
- Computer A measurement unit that periodically measures the total bandwidth of the video signal received from the plurality of cameras via the network; If the measured total bandwidth of the video signal exceeds a first threshold, the variable bit rate encoding method used by the camera is averaged until the total bandwidth of the video signal falls below the first threshold. When the total bandwidth of the measured video signal is lower than a second threshold value less than or equal to the first threshold value, the variable bit rate encoding method used by the camera is changed to the average bit.
- Appendix 19 The camera system according to any one of appendices 1 to 18, further comprising a bandwidth threshold value determination device that measures a communication bandwidth of the network and determines the first threshold value and the second threshold value based on the measurement result.
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Abstract
Description
撮影して得た映像信号を、平均ビットレートのそれぞれ相違する複数の可変ビットレート符号化方式のうちの一の可変ビットレート符号化方式で符号化して送信する複数のカメラと、
上記複数のカメラにネットワークを介して接続される受信装置と
を有し、
上記受信装置は、
上記複数のカメラから上記ネットワークを介して受信する上記映像信号の総帯域を定期的に測定する測定部と、
上記測定された上記映像信号の総帯域が第1の閾値を上回る場合、上記カメラで使用する上記可変ビットレート符号化方式をより平均ビットレートの低いものに切替え、上記測定された上記映像信号の総帯域が上記第1の閾値以下の第2の閾値を下回る場合、上記カメラで使用する上記可変ビットレート符号化方式をより平均ビットレートの高いものに切替える制御部と
を有する。
また本発明の第2の観点にかかる受信装置は、
撮影して得た映像信号を、平均ビットレートのそれぞれ相違する複数の可変ビットレート符号化方式のうちの一の可変ビットレート符号化方式で符号化して送信する複数のカメラにネットワークを介して接続され、
上記複数のカメラから上記ネットワークを介して受信する上記映像信号の総帯域を定期的に測定する測定部と、
上記測定された上記映像信号の総帯域が第1の閾値を上回る場合、上記カメラで使用する上記可変ビットレート符号化方式をより平均ビットレートの低いものに切替え、上記測定された上記映像信号の総帯域が上記第1の閾値以下の第2の閾値を下回る場合、上記カメラで使用する上記可変ビットレート符号化方式をより平均ビットレートの高いものに切替える制御部と
を有する。
また本発明の第3の観点にかかるカメラシステム制御方法は、
複数のカメラのそれぞれが、撮影して得た映像信号を、平均ビットレートのそれぞれ相違する複数の可変ビットレート符号化方式のうちの一の可変ビットレート符号化方式で符号化して、ネットワークを介して受信装置へ送信し、
上記受信装置が、上記複数のカメラから上記ネットワークを介して受信する上記映像信号の総帯域を定期的に測定し、
上記受信装置が、上記測定した上記映像信号の総帯域が第1の閾値を上回る場合、上記カメラで使用する上記可変ビットレート符号化方式をより平均ビットレートの低いものに切替え、
上記受信装置が、上記測定した上記映像信号の総帯域が上記第1の閾値以下の第2の閾値を下回る場合、上記カメラで使用する上記可変ビットレート符号化方式をより平均ビットレートの高いものに切替える。
また本発明の第4の観点にかかるプログラムは、
撮影して得た映像信号を、平均ビットレートのそれぞれ相違する複数の可変ビットレート符号化方式のうちの一の可変ビットレート符号化方式で符号化して送信する複数のカメラにネットワークを介して接続されるコンピュータを、
前記複数のカメラから前記ネットワークを介して受信する前記映像信号の総帯域を定期的に測定する測定部と、
前記測定された前記映像信号の総帯域が第1の閾値を上回る場合、前記カメラで使用する前記可変ビットレート符号化方式をより平均ビットレートの低いものに切替え、前記測定された前記映像信号の総帯域が前記第1の閾値以下の第2の閾値を下回る場合、前記カメラで使用する前記可変ビットレート符号化方式をより平均ビットレートの高いものに切替える制御部と
して機能させる。
[第1の実施形態]
図1を参照すると、本発明の第1の実施形態にかかるカメラシステム100は、複数のカメラ101と、この複数のカメラ101にネットワーク102を通じて接続された受信装置103とを有する。
[本実施形態の特徴]
複数のネットワークカメラから、1箇所にネットワーク経由で映像データを配信し録画する場合、ネットワーク受信の許容量を超えないように、映像内容に基づいてネットワークカメラの録画方式を制御することで、映像群から得られる情報レベルを低下させずにネットワーク帯域を抑えることができる。
映像監視をはじめとして、複数のネットワークカメラを同時に1箇所に録画しようとする場合、複数のネットワークカメラの同時受信に耐えられるネットワーク帯域を設ける必要がある。可変ビットレート符号化方式を採用するネットワークカメラは、映像を符号化する際、複雑な映像、例えば動きが激しい映像や色のバリエーションが多い映像の場合、録画映像品質を保つために、映像の帯域を高くすることがよく行われるが、これらは1つのカメラ内での判断で行われており、他のカメラの状況を踏まえた考慮がされていない。従って、これらのネットワークカメラの全ての映像を確実に1箇所で録画できるようにするためには、全てのネットワークカメラの録画が最大帯域で配信する場合を踏まえた、大きなネットワーク帯域を受信可能な環境を構築する必要があった。
複数のネットワークカメラ映像データを同時に1箇所に録画しようとする時に、受信の総帯域がネットワークの許容量を超えることが予想される場合に、多数の映像を録画するという用途で、同じエリアに複数カメラがある、ほとんど動かない映像がある、色情報が重要ではない可能性があるという特性を利用して、各ネットワークカメラに映像の重要度や監視映像対象の特性に応じた優先度を定めて、優先度を元に個別にネットワークカメラの録画される映像の色階調、フレームレート、解像度などを制御することによって、映像群から得られる情報レベル品質の低下を最小限にして、総帯域を抑える。
図7は本実施形態にかかるカメラシステム200の全体構成を示すブロック図である。本実施形態では、ネットワークカメラ11~1nは、2個以上のn個存在する。ネットワークカメラは、映像を取り込み、圧縮を含めて符号化して録画装置2の録画部へ符号化した映像データを送る。
図10は本実施形態の動作の説明図である。まずステップA1にて、録画部21ではネットワークカメラ11~1nから配信されている映像を受信、録画している。
本実施形態によれば、ネットワークカメラ録画の総帯域を抑えられ、全てのネットワークカメラが最大の帯域を使った場合を考慮したネットワークの構築の必要がなくなり、ネットワーク構築費用を削減できる。
上述した実施形態では、帯域制限の手法は録画装置側で指示しているが、本実施形態では、ネットワークカメラ側で判断する。
上述した実施形態では、カメラの優先度或いは帯域低減の実施優先度をあらかじめ決めておいたが、本実施形態では、カメラの優先度あるいは帯域低減の実施優先度をあらかじめ設定せず、録画されている映像の特性から動的に決定する。
図7に示した実施形態では、ネットワークカメラの帯域低減の実施優先度は予め固定として定めておいたが、本実施形態では、動的に変更する。
本実施形態では、ネットワークカメラと録画装置とがインターネット等のネットワークを通じて接続される場合を想定し、帯域制限を開始する第1の閾値、帯域解除を行うか否かを判断する第2の閾値をネットワークの使用可能帯域の変動にあわせて動的に決定する。
以上、本発明を幾つかの実施形態を挙げて説明したが、本発明は以上の実施形態にのみ限定されず、その他各種の付加変更が可能である。例えば、それぞれの上記実施形態において、帯域を落とした場合でも、通常品質の映像が得られるように、ネットワークカメラ側で通常品質映像を録画する仕組みを持っていてもよい。その場合、総帯域に余裕が出た場合に、ネットワークカメラ側から受信装置103や録画装置2に通常品質映像を配信する仕組みを持つことも考えられる。
[付記1]
撮影して得た映像信号を、平均ビットレートのそれぞれ相違する複数の可変ビットレート符号化方式のうちの一の可変ビットレート符号化方式で符号化して送信する複数のカメラと、
前記複数のカメラにネットワークを介して接続される受信装置と
を有し、
前記受信装置は、
前記複数のカメラから前記ネットワークを介して受信する前記映像信号の総帯域を定期的に測定する測定部と、
前記測定された前記映像信号の総帯域が第1の閾値を上回る場合、前記映像信号の総帯域が前記第1の閾値を下回るまで、前記カメラで使用する前記可変ビットレート符号化方式をより平均ビットレートの低いものに切替え、前記測定された前記映像信号の総帯域が前記第1の閾値以下の第2の閾値を下回る場合、前記カメラで使用する前記可変ビットレート符号化方式が前記平均ビットレートの最も高いもの以外に切り替わっている前記カメラを切替え対象として、前記カメラで使用する前記可変ビットレート符号化方式をより平均ビットレートの高いものに切替える制御部と
を有する
カメラシステム。
[付記2]
前記受信装置の前記制御部は、前記カメラで使用する前記可変ビットレート符号化方式をより平均ビットレートの低いものに切替える際には、より優先度の低い前記カメラから順に切替えを行い、前記カメラで使用する前記可変ビットレート符号化方式をより平均ビットレートの高いものに切替える際には、より優先度の高い前記カメラから順に切替えを行う
付記1に記載のカメラシステム。
[付記3]
前記平均ビットレートのそれぞれ相違する複数の可変ビットレート符号化方式は、第1の可変ビットレート符号化方式と、前記第1の可変ビットレート符号化方式に比べてフレームレートを半減した第2の可変ビットレート符号化方式と、カラー映像に符号化するか、白黒映像に符号化するかの観点において前記第1の可変ビットレート符号化方式と相違する第3の可変ビットレート符号化方式と、前記第1の可変ビットレート符号化方式と量子化ステップサイズが相違する第4の可変ビットレート符号化方式とのうちの何れか2つを含む
付記1または2に記載のカメラシステム。
[付記4]
前記優先度は、前記カメラと前記可変ビットレート符号化方式との組み合わせに対して事前に設定されている
付記2に記載のカメラシステム。
[付記5]
前記制御部は、前記カメラ毎の優先時間帯の情報に応じて、前記優先度を変更する
付記2または4に記載のカメラシステム。
[付記6]
前記制御部は、前記カメラから受信した映像信号の変化の程度に応じて前記優先度を決定する
付記2または4に記載のカメラシステム。
[付記7]
前記ネットワークの使用可能帯域を測定し、該測定した結果に応じて前記第1の閾値と前記第2の閾値とを決定する帯域閾値判定装置を、さらに有する
付記1乃至6の何れかに記載のカメラシステム。
[付記8]
前記受信装置は、前記カメラから受信した前記映像信号を記録する録画部を、さらに有する
付記1乃至7の何れかに記載のカメラシステム。
[付記9]
撮影して得た映像信号を、平均ビットレートのそれぞれ相違する複数の可変ビットレート符号化方式のうちの一の可変ビットレート符号化方式で符号化して送信する複数のカメラにネットワークを介して接続され、
前記複数のカメラから前記ネットワークを介して受信する前記映像信号の総帯域を定期的に測定する測定部と、
前記測定された前記映像信号の総帯域が第1の閾値を上回る場合、前記映像信号の総帯域が前記第1の閾値を下回るまで、前記カメラで使用する前記可変ビットレート符号化方式をより平均ビットレートの低いものに切替え、前記測定された前記映像信号の総帯域が前記第1の閾値以下の第2の閾値を下回る場合、前記カメラで使用する前記可変ビットレート符号化方式が前記平均ビットレートの最も高いもの以外に切り替わっている前記カメラを切替え対象として、前記カメラで使用する前記可変ビットレート符号化方式をより平均ビットレートの高いものに切替える制御部と
を有する
受信装置。
[付記10]
前記制御部は、前記カメラで使用する前記可変ビットレート符号化方式をより平均ビットレートの低いものに切替える際には、より優先度の低い前記カメラから順に切替えを行い、前記カメラで使用する前記可変ビットレート符号化方式をより平均ビットレートの高いものに切替える際には、より優先度の高い前記カメラから順に切替えを行う
付記9に記載の受信装置。
[付記11]
前記平均ビットレートのそれぞれ相違する複数の可変ビットレート符号化方式は、第1の可変ビットレート符号化方式と、前記第1の可変ビットレート符号化方式に比べてフレームレートを半減した第2の可変ビットレート符号化方式と、カラー映像に符号化するか、白黒映像に符号化するかの観点において前記第1の可変ビットレート符号化方式と相違する第3の可変ビットレート符号化方式と、前記第1の可変ビットレート符号化方式と量子化ステップサイズが相違する第4の可変ビットレート符号化方式とのうちの何れか2つを含む
付記9または10に記載の受信装置。
[付記12]
前記優先度は、前記カメラと前記可変ビットレート符号化方式との組み合わせに対して事前に設定されている
付記10に記載の受信装置。
[付記13]
前記制御部は、前記カメラ毎の優先時間帯の情報に応じて、前記優先度を変更する
付記10または12に記載の受信装置。
[付記14]
前記制御部は、前記カメラから受信した映像信号の変化の程度に応じて前記優先度を決定する
付記10または12に記載の受信装置。
[付記15]
前記ネットワークの使用可能帯域を測定し、該測定した結果に応じて前記第1の閾値と前記第2の閾値とを決定する帯域閾値判定装置に、さらに接続されている
付記9乃至14の何れかに記載の受信装置。
[付記16]
前記カメラから受信した前記映像信号を記録する録画部を、さらに有する
付記9乃至15の何れかに記載の受信装置。
[付記17]
複数のカメラのそれぞれが、撮影して得た映像信号を、平均ビットレートのそれぞれ相違する複数の可変ビットレート符号化方式のうちの一の可変ビットレート符号化方式で符号化して、ネットワークを介して受信装置へ送信し、
前記受信装置が、前記複数のカメラから前記ネットワークを介して受信する前記映像信号の総帯域を定期的に測定し、
前記受信装置が、前記測定した前記映像信号の総帯域が第1の閾値を上回る場合、前記映像信号の総帯域が前記第1の閾値を下回るまで、前記カメラで使用する前記可変ビットレート符号化方式をより平均ビットレートの低いものに切替え、
前記受信装置が、前記測定した前記映像信号の総帯域が前記第1の閾値以下の第2の閾値を下回る場合、前記カメラで使用する前記可変ビットレート符号化方式が前記平均ビットレートの最も高いもの以外に切り替わっている前記カメラを切替え対象として、前記カメラで使用する前記可変ビットレート符号化方式をより平均ビットレートの高いものに切替える
カメラシステム制御方法。
[付記18]
撮影して得た映像信号を、平均ビットレートのそれぞれ相違する複数の可変ビットレート符号化方式のうちの一の可変ビットレート符号化方式で符号化して送信する複数のカメラにネットワークを介して接続されるコンピュータを、
前記複数のカメラから前記ネットワークを介して受信する前記映像信号の総帯域を定期的に測定する測定部と、
前記測定された前記映像信号の総帯域が第1の閾値を上回る場合、前記映像信号の総帯域が前記第1の閾値を下回るまで、前記カメラで使用する前記可変ビットレート符号化方式をより平均ビットレートの低いものに切替え、前記測定された前記映像信号の総帯域が前記第1の閾値以下の第2の閾値を下回る場合、前記カメラで使用する前記可変ビットレート符号化方式が前記平均ビットレートの最も高いもの以外に切り替わっている前記カメラを切替え対象として、前記カメラで使用する前記可変ビットレート符号化方式をより平均ビットレートの高いものに切替える制御部と
して機能させるためのプログラム。
[付記19]
前記ネットワークの通信帯域を測定し、該測定した結果に基づいて前記第1の閾値および前記第2の閾値を決定する帯域閾値判定装置を有する付記1乃至18の何れかに記載のカメラシステム、受信装置、カメラシステム制御方法、プログラム。
101…カメラ
102…ネットワーク
103…受信装置
104…測定部
105…制御部
Claims (10)
- 撮影して得た映像信号を、平均ビットレートのそれぞれ相違する複数の可変ビットレート符号化方式のうちの一の可変ビットレート符号化方式で符号化して送信する複数のカメラと、
前記複数のカメラにネットワークを介して接続される受信装置と
を有し、
前記受信装置は、
前記複数のカメラから前記ネットワークを介して受信する前記映像信号の総帯域を定期的に測定する測定部と、
前記測定された前記映像信号の総帯域が第1の閾値を上回る場合、前記カメラで使用する前記可変ビットレート符号化方式をより平均ビットレートの低いものに切替え、前記測定された前記映像信号の総帯域が前記第1の閾値以下の第2の閾値を下回る場合、前記カメラで使用する前記可変ビットレート符号化方式をより平均ビットレートの高いものに切替える制御部と
を有する
カメラシステム。 - 前記受信装置の前記制御部は、前記カメラで使用する前記可変ビットレート符号化方式をより平均ビットレートの低いものに切替える際には、より優先度の低い前記カメラから順に切替えを行い、前記カメラで使用する前記可変ビットレート符号化方式をより平均ビットレートの高いものに切替える際には、より優先度の高い前記カメラから順に切替えを行う
請求項1に記載のカメラシステム。 - 前記平均ビットレートのそれぞれ相違する複数の可変ビットレート符号化方式は、第1の可変ビットレート符号化方式と、前記第1の可変ビットレート符号化方式に比べてフレームレートを半減した第2の可変ビットレート符号化方式と、カラー映像に符号化するか、白黒映像に符号化するかの観点において前記第1の可変ビットレート符号化方式と相違する第3の可変ビットレート符号化方式と、前記第1の可変ビットレート符号化方式と量子化ステップサイズが相違する第4の可変ビットレート符号化方式とのうちの少なくとも何れか2つを含む
請求項1または2に記載のカメラシステム。 - 撮影して得た映像信号を、平均ビットレートのそれぞれ相違する複数の可変ビットレート符号化方式のうちの一の可変ビットレート符号化方式で符号化して送信する複数のカメラにネットワークを介して接続され、
前記複数のカメラから前記ネットワークを介して受信する前記映像信号の総帯域を定期的に測定する測定部と、
前記測定された前記映像信号の総帯域が第1の閾値を上回る場合、前記カメラで使用する前記可変ビットレート符号化方式をより平均ビットレートの低いものに切替え、前記測定された前記映像信号の総帯域が前記第1の閾値以下の第2の閾値を下回る場合、前記カメラで使用する前記可変ビットレート符号化方式をより平均ビットレートの高いものに切替える制御部と
を有する
受信装置。 - 前記制御部は、前記カメラで使用する前記可変ビットレート符号化方式をより平均ビットレートの低いものに切替える際には、より優先度の低い前記カメラから順に切替えを行い、前記カメラで使用する前記可変ビットレート符号化方式をより平均ビットレートの高いものに切替える際には、より優先度の高い前記カメラから順に切替えを行う
請求項4に記載の受信装置。 - 前記平均ビットレートのそれぞれ相違する複数の可変ビットレート符号化方式は、第1の可変ビットレート符号化方式と、前記第1の可変ビットレート符号化方式に比べてフレームレートを半減した第2の可変ビットレート符号化方式と、カラー映像に符号化するか、白黒映像に符号化するかの観点において前記第1の可変ビットレート符号化方式と相違する第3の可変ビットレート符号化方式と、前記第1の可変ビットレート符号化方式と量子化ステップサイズが相違する第4の可変ビットレート符号化方式とのうちの少なくとも何れか2つを含む
請求項4または5に記載の受信装置。 - 前記優先度は、前記カメラと前記可変ビットレート符号化方式との組み合わせに対して事前に設定されている
請求項5に記載の受信装置。 - 前記制御部は、前記カメラから受信した映像信号の変化の程度に応じて前記優先度を決定する
請求項5または7に記載の受信装置。 - 複数のカメラのそれぞれが、撮影して得た映像信号を、平均ビットレートのそれぞれ相違する複数の可変ビットレート符号化方式のうちの一の可変ビットレート符号化方式で符号化して、ネットワークを介して受信装置へ送信し、
前記受信装置が、前記複数のカメラから前記ネットワークを介して受信する前記映像信号の総帯域を定期的に測定し、
前記受信装置が、前記測定した前記映像信号の総帯域が第1の閾値を上回る場合、前記カメラで使用する前記可変ビットレート符号化方式をより平均ビットレートの低いものに切替え、
前記受信装置が、前記測定した前記映像信号の総帯域が前記第1の閾値以下の第2の閾値を下回る場合、前記カメラで使用する前記可変ビットレート符号化方式をより平均ビットレートの高いものに切替える
カメラシステム制御方法。 - 撮影して得た映像信号を、平均ビットレートのそれぞれ相違する複数の可変ビットレート符号化方式のうちの一の可変ビットレート符号化方式で符号化して送信する複数のカメラにネットワークを介して接続されるコンピュータを、
前記複数のカメラから前記ネットワークを介して受信する前記映像信号の総帯域を定期的に測定する測定部と、
前記測定された前記映像信号の総帯域が第1の閾値を上回る場合、前記カメラで使用する前記可変ビットレート符号化方式をより平均ビットレートの低いものに切替え、前記測定された前記映像信号の総帯域が前記第1の閾値以下の第2の閾値を下回る場合、前記カメラで使用する前記可変ビットレート符号化方式をより平均ビットレートの高いものに切替える制御部と
して機能させるためのプログラム。
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017535172A (ja) * | 2014-10-08 | 2017-11-24 | フラウンホファー ゲセルシャフト ツール フェールデルンク ダー アンゲヴァンテン フォルシュンク エー.ファオ. | ビデオカメラシステムにおけるデータレートの設定 |
WO2019082864A1 (ja) * | 2017-10-23 | 2019-05-02 | 日本電気株式会社 | 映像配信システム、映像配信方法、及び、映像配信プログラムを格納する記録媒体 |
JP2021534679A (ja) * | 2018-08-16 | 2021-12-09 | 北京七▲しん▼易維信息技術有限公司Beijing 7Invensun Technology Co., Ltd. | 画像取得装置の制御方法及び装置 |
WO2022070333A1 (ja) * | 2020-09-30 | 2022-04-07 | 日本電気株式会社 | 通信制御装置、通信制御システム、通信制御方法、及び、プログラムが格納された非一時的なコンピュータ可読媒体 |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5864876B2 (ja) * | 2011-03-25 | 2016-02-17 | オリンパス株式会社 | 画像処理装置及び画像処理方法 |
WO2014061181A1 (ja) * | 2012-10-18 | 2014-04-24 | 日本電気株式会社 | カメラシステム |
DE102013224539A1 (de) * | 2013-11-29 | 2015-06-03 | Bayerische Motoren Werke Aktiengesellschaft | Verfahren, Vorrichtung, Computerprogramm und Computerprogrammprodukt zur Bilddatenübertragung |
KR102104410B1 (ko) * | 2014-01-20 | 2020-04-27 | 한화테크윈 주식회사 | 카메라 프로파일 설정 방법 및 영상 수신 장치 |
JP6364838B2 (ja) * | 2014-03-14 | 2018-08-01 | 日本電気株式会社 | 映像処理装置および映像処理方法 |
US10298854B2 (en) * | 2014-05-30 | 2019-05-21 | Apple Inc. | High dynamic range video capture control for video transmission |
WO2016203584A1 (ja) * | 2015-06-17 | 2016-12-22 | オリンパス株式会社 | 撮像制御装置、撮像システム、撮像制御方法、およびプログラム |
US10873726B1 (en) * | 2015-06-29 | 2020-12-22 | Amazon Technologies, Inc. | Management of sensor failure in a facility |
US10993069B2 (en) * | 2015-07-16 | 2021-04-27 | Snap Inc. | Dynamically adaptive media content delivery |
CN108024088B (zh) * | 2016-10-31 | 2020-07-03 | 杭州海康威视系统技术有限公司 | 一种视频轮巡方法及装置 |
US10623791B2 (en) | 2018-06-01 | 2020-04-14 | At&T Intellectual Property I, L.P. | Field of view prediction in live panoramic video streaming |
US10812774B2 (en) | 2018-06-06 | 2020-10-20 | At&T Intellectual Property I, L.P. | Methods and devices for adapting the rate of video content streaming |
US10616621B2 (en) | 2018-06-29 | 2020-04-07 | At&T Intellectual Property I, L.P. | Methods and devices for determining multipath routing for panoramic video content |
CN108966008B (zh) * | 2018-08-02 | 2020-08-11 | 腾讯科技(深圳)有限公司 | 直播视频回放方法及装置 |
US11019361B2 (en) | 2018-08-13 | 2021-05-25 | At&T Intellectual Property I, L.P. | Methods, systems and devices for adjusting panoramic view of a camera for capturing video content |
US10887169B2 (en) * | 2018-12-21 | 2021-01-05 | Here Global B.V. | Method and apparatus for regulating resource consumption by one or more sensors of a sensor array |
US11343531B2 (en) | 2020-06-17 | 2022-05-24 | Western Digital Technologies, Inc. | Storage system and method for object monitoring |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002351438A (ja) * | 2001-05-25 | 2002-12-06 | Mitsubishi Electric Corp | 映像監視システム |
JP2006345208A (ja) * | 2005-06-08 | 2006-12-21 | Oki Electric Ind Co Ltd | 映像監視システム、監視映像管理装置及び監視映像提供装置 |
JP2011139200A (ja) * | 2009-12-28 | 2011-07-14 | Sony Corp | 受信装置、受信方法およびプログラム |
Family Cites Families (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6292098B1 (en) * | 1998-08-31 | 2001-09-18 | Hitachi, Ltd. | Surveillance system and network system |
US20070053428A1 (en) * | 2001-03-30 | 2007-03-08 | Vixs Systems, Inc. | Managed degradation of a video stream |
JP2003071181A (ja) * | 2001-09-05 | 2003-03-11 | Toshiba Corp | 洗濯機 |
IL162879A0 (en) * | 2002-07-05 | 2005-11-20 | Dmatek Ltd | A method and system for effectively performing event detection in a large number of concurrent imagesequences |
JP2005136596A (ja) | 2003-10-29 | 2005-05-26 | Ricoh Co Ltd | 動画像処理システム、動画像処理方法、プログラム及び情報記録媒体 |
JP2005292879A (ja) * | 2004-03-31 | 2005-10-20 | Fujitsu Ltd | 撮影情報サーバおよび撮影情報送信システム |
JP4432660B2 (ja) | 2004-07-30 | 2010-03-17 | 日本ビクター株式会社 | 監視システム及び監視システムの制御方法 |
JP2008533853A (ja) * | 2005-03-10 | 2008-08-21 | クゥアルコム・インコーポレイテッド | 先読みを伴う準一定品質のレート制御 |
US20070024706A1 (en) * | 2005-08-01 | 2007-02-01 | Brannon Robert H Jr | Systems and methods for providing high-resolution regions-of-interest |
JP4947936B2 (ja) * | 2005-08-11 | 2012-06-06 | ソニー株式会社 | モニタリングシステムおよび管理装置 |
WO2008035745A1 (en) * | 2006-09-20 | 2008-03-27 | Panasonic Corporation | Monitor system, camera and video image coding method |
US9300923B2 (en) * | 2007-03-26 | 2016-03-29 | Pelco, Inc. | Method and apparatus for improving video performance in a wireless surveillance system |
WO2009012412A1 (en) * | 2007-07-17 | 2009-01-22 | Carnegie Mellon University | Multiple resolution video network with context based control |
JP4893649B2 (ja) * | 2008-02-08 | 2012-03-07 | 富士通株式会社 | 帯域制御サーバ及び帯域制御プログラム並びに監視システム |
TWI362888B (en) * | 2008-12-24 | 2012-04-21 | Acer Inc | Encoding and decoding method for video screen layout, encoding device, decoding device, and data structure |
JPWO2010113671A1 (ja) * | 2009-03-30 | 2012-10-11 | 日本電気株式会社 | ネットワークカメラ装置、動作制御方法及びプログラム |
JP5359536B2 (ja) | 2009-05-07 | 2013-12-04 | 富士通モバイルコミュニケーションズ株式会社 | 携帯電話機、及び携帯電話機の表示方向制御プログラム |
WO2011068784A1 (en) * | 2009-12-01 | 2011-06-09 | Azuki Systems, Inc. | Method and system for secure and reliable video streaming with rate adaptation |
KR20110114957A (ko) * | 2010-04-14 | 2011-10-20 | 삼성전기주식회사 | 데이터 송신 장치와 방법, 이를 이용한 네트워크 데이터 전송 시스템 및 방법 |
US8970701B2 (en) * | 2011-10-21 | 2015-03-03 | Mesa Engineering, Inc. | System and method for predicting vehicle location |
US8918474B2 (en) * | 2012-03-26 | 2014-12-23 | International Business Machines Corporation | Determining priorities for cached objects to order the transfer of modifications of cached objects based on measured network bandwidth |
WO2014061181A1 (ja) * | 2012-10-18 | 2014-04-24 | 日本電気株式会社 | カメラシステム |
-
2013
- 2013-08-14 WO PCT/JP2013/004859 patent/WO2014061181A1/ja active Application Filing
- 2013-08-14 US US14/435,214 patent/US9503731B2/en active Active
- 2013-08-14 JP JP2014541908A patent/JP5979241B2/ja active Active
-
2016
- 2016-10-06 US US15/286,862 patent/US10623690B2/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002351438A (ja) * | 2001-05-25 | 2002-12-06 | Mitsubishi Electric Corp | 映像監視システム |
JP2006345208A (ja) * | 2005-06-08 | 2006-12-21 | Oki Electric Ind Co Ltd | 映像監視システム、監視映像管理装置及び監視映像提供装置 |
JP2011139200A (ja) * | 2009-12-28 | 2011-07-14 | Sony Corp | 受信装置、受信方法およびプログラム |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017535172A (ja) * | 2014-10-08 | 2017-11-24 | フラウンホファー ゲセルシャフト ツール フェールデルンク ダー アンゲヴァンテン フォルシュンク エー.ファオ. | ビデオカメラシステムにおけるデータレートの設定 |
WO2019082864A1 (ja) * | 2017-10-23 | 2019-05-02 | 日本電気株式会社 | 映像配信システム、映像配信方法、及び、映像配信プログラムを格納する記録媒体 |
JPWO2019082864A1 (ja) * | 2017-10-23 | 2020-11-19 | 日本電気株式会社 | 映像配信システム、映像配信方法、及び、映像配信プログラム |
US11172166B2 (en) | 2017-10-23 | 2021-11-09 | Nec Corporation | Video distribution system, video distribution method, and recording medium storing video distribution program |
JP2021534679A (ja) * | 2018-08-16 | 2021-12-09 | 北京七▲しん▼易維信息技術有限公司Beijing 7Invensun Technology Co., Ltd. | 画像取得装置の制御方法及び装置 |
JP7305749B2 (ja) | 2018-08-16 | 2023-07-10 | 北京七▲しん▼易維信息技術有限公司 | 画像取得装置の制御方法及び装置 |
US11853471B2 (en) | 2018-08-16 | 2023-12-26 | Beijing 7Invensun Technology Co., Ltd. | Method and apparatus for controlling image acquisition device |
WO2022070333A1 (ja) * | 2020-09-30 | 2022-04-07 | 日本電気株式会社 | 通信制御装置、通信制御システム、通信制御方法、及び、プログラムが格納された非一時的なコンピュータ可読媒体 |
JP7459958B2 (ja) | 2020-09-30 | 2024-04-02 | 日本電気株式会社 | 通信制御システム |
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