JP2005094192A - Dynamic image selection output apparatus, dynamic image selection output system, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dynamic image selection output apparatus capable of properly selecting dynamic image data imaged by any of a plurality of imaging apparatuses. <P>SOLUTION: The dynamic image selection output apparatus 20 for selecting a dynamic image imaged by any of a plurality of the imaging apparatuses and outputting the selected dynamic image is provided with: a compression rate acquisition means 215 for acquiring a compression rate denoting the rate of a data size reduced by compression from a data size before the compression as to each of a plurality of the dynamic image data imaged by each of a plurality of the imaging apparatuses and compressed on the basis of inter-frame correlation; and a selection output means 240 for selecting dynamic image data whose compression rate is lower than that of the other dynamic image data for a predetermined imaging period among a plurality of the dynamic image data imaged by a plurality of the imaging apparatuses and outputting the selected dynamic image data. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a moving image selection output device, a moving image selection output system, and a program. In particular, the present invention relates to a moving image selection output device, a moving image selection output system, and a program that select and output a moving image captured by any of a plurality of imaging devices.

In recent years, imaging devices such as security cameras have become widespread for the purpose of reducing security burdens and reducing costs. A moving image captured by the imaging device has a relatively large data size when processed as a digital signal. For this reason, a technique for compressing moving image data has been proposed (refer to Patent Document 1 for a method of controlling the compression rate).
JP 2002-262273 A

  However, even when moving image data is compressed, if a large number of imaging devices are installed and managed centrally, the data transfer amount of the communication path may approach the allowable transfer amount. In this case, the quality of the moving image may be degraded, for example, a frame may be dropped. In addition, monitoring a large number of moving images in parallel is a heavy burden for the observer.

In order to solve the above problem, in the first embodiment of the present invention, a moving image selection output device that selects and outputs a moving image captured by any of a plurality of imaging devices, the plurality of imaging devices For each of a plurality of moving image data imaged and compressed based on the correlation between frames, a compression ratio acquisition is performed to obtain a compression ratio indicating a ratio of the data size reduced by the compression to the data size before the compression. And a selection output means for selecting and outputting moving image data having a compression rate lower than that of other moving image data during a predetermined imaging period among a plurality of moving image data captured by a plurality of imaging devices. Provided is a moving image selection output device.
Also, moving image receiving means for receiving moving image data compressed based on the correlation between frames from each of a plurality of imaging devices, and compression for the data size before compression in each of the received plurality of moving image data Compression ratio detecting means for detecting a compression ratio indicating a ratio of the data size reduced by the compression ratio, the compression ratio acquiring means acquires the compression ratio detected by the compression ratio detecting means, and the selection output means is a moving image. Of the plurality of moving image data received by the receiving means, moving image data having a compression rate lower than that of other moving image data during the imaging period may be selected and output.

In addition, the moving image data includes an I picture indicating data compressed in the frame, a P picture including data indicating a difference between the I picture, and B indicating data indicating a difference between the I picture or the P picture. A data size obtained by subtracting the data size of the B picture or the P picture from the data size of the I picture with respect to the data size of the I picture. May be detected as a compression rate.
The moving image is composed of a plurality of objects, the moving image receiving means receives moving image data for each object, the compression ratio detecting means detects the compression ratio for each object, and the selection output means is One moving image data may be selected when the compression rate of one object in one moving image data is lower than the compression rate of another object in the other moving image data.

In addition, the captured moving image data is transmitted to the moving image selection output device with respect to the imaging device that captured moving image data having a compression rate lower than that of the other moving image data during the imaging period among the plurality of moving image data. The transmission instruction transmission means for transmitting the transmission instruction may be further provided, and the selection output means may output the received moving image data as a response to the transmission instruction.
In addition, the selection output device may select moving image data having a compression rate significantly lower than that of other moving image data during a predetermined imaging period among the plurality of moving image data.

The selection output means selects moving image data having the smallest compression rate from among the plurality of moving image data, and moving image data obtained by imaging a predetermined range centering on an imaging range of the moving image data. May be.
The image processing apparatus further includes a moving direction detecting unit that detects a moving direction in which the imaging target moves based on at least one of the plurality of moving image data, and the selection output unit has the smallest compression rate among the plurality of moving image data. You may select and output moving image data and the moving image data of the imaging device which images the imaging range adjacent to a moving direction from the imaging range of the imaging device which imaged the said moving image data.

  In the second embodiment of the present invention, a moving image selection output system including a plurality of moving image selection output devices that select and output moving image data indicating a moving image captured by any of a plurality of imaging devices. Each of the first moving image selection output device and the second moving image selection output device is a plurality of moving image data captured by each of the plurality of imaging devices and compressed based on the correlation between frames. A compression rate acquisition means for acquiring a compression rate indicating a ratio of a data size reduced by compression with respect to a data size before compression, and a compression rate other than a plurality of moving image data in a predetermined period. Selection output means for selecting and outputting moving image data lower than the moving image data, and the third moving image selection output device includes the first moving image selection output device and the second moving image selection output device. For each of the moving image data selected by each of the image selection output devices, the compression rate acquisition means for acquiring the compression rate, and each of the first moving image selection output device and the second moving image selection output device select There is provided a moving image selection / output system having selection output means for selecting and outputting moving image data having a compression rate lower than that of other moving image data in a predetermined period of the moving image data.

  According to a third aspect of the present invention, there is provided a moving image selection output system that includes a plurality of imaging devices and selects and outputs a moving image captured by any of the plurality of imaging devices. Each of the devices has reduced compression data for moving image data indicating a captured moving image based on the correlation between frames, and moving image data compressed by the compression device by compression with respect to the data size before compression. A compression rate detection unit that detects a compression rate indicating a data size ratio, a transmission unit that transmits the compression rate to another imaging device, and a compression rate of moving image data in another imaging device in the moving image selection output system When the compression rate receiving unit to receive and the detected compression rate is lower than the compression rate of another imaging device in the moving image selection output system, the compression unit receives Ri to provide a moving picture selection output system and a moving picture output means for outputting the compressed the moving image data.

According to a fourth aspect of the present invention, there is provided a program for causing a computer to function as a moving image selection output device that selects and outputs a moving image captured by any one of a plurality of imaging devices. A compression ratio indicating a ratio of a data size reduced by compression with respect to a data size before compression is acquired for each of a plurality of moving image data captured by each of the imaging devices and compressed based on a correlation between frames. A compression rate acquisition unit and a program that functions as a selection output unit that selects and outputs moving image data having a compression rate lower than that of other moving image data in a predetermined imaging period among a plurality of moving image data are provided. .
The above summary of the invention does not enumerate all the necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

  According to the present invention, it is possible to appropriately select moving image data.

  Hereinafter, the present invention will be described through embodiments of the invention. However, the following embodiments do not limit the invention according to the scope of claims, and all combinations of features described in the embodiments are included. It is not necessarily essential for the solution of the invention.

  FIG. 1 is a block diagram of a moving image selection / output system 10. FIG. 2 is a block diagram of the moving image selection / output device 20. The moving image selection output system 10 is a device that monitors a room and a passage of a building for the purpose of crime prevention and the like, and a moving image picked up by any of a plurality of imaging devices, for example, the imaging devices 50-1 to 50-9. Among them, an object is to select and output an appropriate moving image as a monitoring target.

  The moving image selection output system 10 includes a moving image selection output device 20 that is an example of a first moving image selection output device, a moving image selection output device 30 that is an example of a second moving image selection output device, and a third A moving image selection output device 40 which is an example of the moving image selection output device, and imaging devices 50-1 to 50-9. The moving image selection output device 20 includes a moving image receiving unit 200, a compression rate detection unit 210, a compression rate acquisition unit 215, an imaging range information storage unit 220, a moving direction detection unit 230, and a selection output unit 240. Have.

  The moving image receiving unit 200 receives moving image data compressed based on the correlation between frames from each of the imaging devices 50-1 to 50-3, and compresses the compression rate detecting unit 210, the moving direction detecting unit 230, and the selection output. Send to means 240. The compression rate detection unit 210 detects a compression rate indicating the ratio of the data size reduced by the compression to the data size before compression in each of the plurality of received moving image data, and sends it to the compression rate acquisition unit 215. The compression rate acquisition unit 215 obtains the compression rate for each of a plurality of moving image data captured by each of the imaging devices 50-1 to 50-3 and compressed based on the correlation between frames from the compression rate detection unit 210. Obtain it and send it to the selection output means 240. The imaging range information storage unit 220 stores imaging range information indicating the imaging range for each imaging device.

  The movement direction detection unit 230 detects the movement direction in which the imaging target moves based on at least one of the plurality of moving image data and the imaging range information acquired from the imaging range information storage unit 220, and sends it to the selection output unit 240. . The selection output means 240 is a moving image data having a compression rate lower than that of other moving image data in a predetermined imaging period among a plurality of moving image data, for example, a moving image having the lowest compression rate among a plurality of moving image data. Image data is selected and output to the moving image selection output device 40. Instead of this, the selection output means 240 may select moving image data whose compression rate is significantly lower than that of other moving image data during a predetermined imaging period among a plurality of moving image data. .

  Further, the selection output means 240 is an imaging range adjacent to the moving direction detected by the moving direction detection means 230 from the imaging range of the imaging device that has captured the moving image data having the lowest compression rate among the plurality of moving image data. An imaging device that captures images may be selected based on imaging range information. Then, the selection output unit 240 further selects the moving image data of the selected imaging device and outputs it to the moving image selection output device 40.

  The moving image selection / output device 30 has substantially the same configuration as the moving image selection / output device 20 except that it receives moving image data from each of the imaging devices 50-4 to 6, and thus detailed description thereof is omitted. The moving image selection output device 40 receives moving image data from each or any of the moving image selection output device 20, the moving image selection output device 30, and the imaging devices 50-7 to 9, and the moving image data Other than the matter of outputting either one to the outside, the configuration is substantially the same as that of the moving image selecting / outputting device 20, and thus detailed description thereof is omitted.

  Each of the imaging devices 50-1 to 50-3 compresses the captured moving image data based on the correlation between frames and sends the compressed data to the moving image selection output device 20. Each of the imaging devices 50-4 to 6-6 compresses the captured moving image data based on the correlation between frames, and sends the compressed data to the moving image selection output device 30.

  As described above, the moving image selection output device 20 has a lower compression rate in the compression processing based on the correlation between frames among the plurality of moving image data captured by the plurality of imaging devices. Select and output data. As a result, it is possible to easily detect that the imaging target has moved, so that the burden on the supervisor can be reduced and the load on the network can be reduced.

  FIG. 3 is a block diagram of the imaging device 50-7. The imaging device 50-7 includes an imaging unit 300, a compression unit 310, a compression rate detection unit 320, a transmission unit 330, a compression rate reception unit 340, and a moving image output unit 350. Note that each of the imaging device 50-8 and the imaging device 50-9 has substantially the same configuration as the imaging device 50-7, and therefore only the differences will be described. The imaging unit 300 captures a moving image and sends moving image data indicating the captured moving image to the compression unit 310.

  The compression unit 310 compresses the received moving image data based on the correlation between frames, and sends the compressed data to the compression rate detection unit 320 and the moving image output unit 350. The compression rate detection unit 320 detects a compression rate indicating a ratio of the data size reduced by the compression to the data size before compression in the moving image data compressed by the compression unit 310, and transmits the transmission unit 330 and the moving image output unit 350. Send to.

  The transmission unit 330 transmits the detected compression rate to another imaging device, for example, the imaging device 50-8 and the imaging device 50-9. The compression rate receiving unit 340 receives the compression rate of moving image data in another imaging device such as the imaging device 50-8 and the imaging device 50-9 and sends it to the moving image output unit 350.

  The transmission unit 330 in the imaging device 50-8 transmits the detected compression rate to the imaging device 50-7 and the imaging device 50-9. Similarly, the transmission means 330 in the imaging device 50-9 transmits the detected compression rate to the imaging device 50-7 and the imaging device 50-8. Further, the compression rate receiving unit 340 in the imaging device 50-8 receives the compression rate of the moving image data in the imaging device 50-7 and the imaging device 50-9. Similarly, the compression rate receiving means 340 in the imaging device 50-9 receives the compression rate of the moving image data in the imaging device 50-7 and the imaging device 50-8.

When the compression rate detected by the compression rate detection unit 320 is lower than the compression rate in the imaging device 50-8 and the imaging device 50-9, the moving image output unit 350 outputs the moving image data compressed by the compression unit 310. It outputs to the moving image selection output device 40.
As described above, according to the example of this figure, it is possible to appropriately select and output moving image data without providing a device such as the moving image selection output device 20 in addition to the imaging device.

  FIG. 4 shows an operation flow of the moving image selecting / outputting device 20. The moving image receiving means 200 receives moving image data compressed based on the correlation between frames from each of the imaging devices 50-1 to 50-3 (S400). For example, the moving image receiving unit 200 may receive data indicating a difference between frames as moving image data compressed based on the correlation between frames. As an example, the moving image data compressed based on the correlation between frames is data compressed based on a predetermined standard, for example, compressed by the MPEG-1, MPEG-2, or MPEG-4 system. Moving image data. The predetermined standard is not limited to the MPEG standard, and may be another standard that defines a method for compressing moving image data.

  The compression rate detection unit 210 detects the compression rate in each of the received plurality of moving image data (S410). The compression rate acquisition unit 215 obtains the compression rate for each of a plurality of moving image data captured by each of the imaging devices 50-1 to 50-3 and compressed based on the correlation between frames from the compression rate detection unit 210. Obtain (S415). The moving direction detection unit 230 detects the moving direction in which the imaging target moves based on at least one of the plurality of moving image data and the imaging range information (S420).

  For example, the moving direction detection unit 230 determines that the compression rate of the moving image data in the imaging device 50-2 is within a predetermined time after the compression rate of the moving image data in the imaging device 50-1 is lower than the other moving image data. When it is detected that it is lower than the other moving image data, the direction from the imaging range of the imaging device 50-1 toward the imaging range of the imaging device 50-2 is detected as the moving direction of the imaging target. Thereby, when an imaging target passes through the imaging ranges of a plurality of imaging devices, it is possible to appropriately detect the moving direction of the imaging target.

  Instead, when the moving image data is compressed by the compression method using the motion prediction function for predicting the motion of the imaging target, the moving direction detection unit 230 uses the motion calculated by the motion prediction function. May be detected as the moving direction of the imaging target. Thereby, even when the imaging target moves within the imaging range of a single imaging device, the moving direction of the imaging target can be appropriately detected.

  The selection output unit 240 captures an imaging range adjacent to the detected moving direction from the moving image data having the lowest compression rate among the plurality of received moving image data and the imaging range of the imaging device that captured the moving image data. The selected moving image data is selected (S430).

  Instead, the selection output unit 240 captures moving image data having the lowest compression rate among the plurality of received moving image data and a moving image obtained by capturing a predetermined range centered on the imaging range of the moving image data. The image data may be selected regardless of the moving direction. In this case, even when the detected movement direction is different from the actual movement direction of the imaging target, the possibility of appropriately selecting moving image data obtained by imaging the imaging target after movement can be increased.

  As yet another example, the selection output unit 240 may select and output a plurality of moving image data whose compression rate is lower than a predetermined threshold. In this case, the selection output unit 240 may not select the moving image data if any moving image data has a compression rate higher than the threshold value.

  FIG. 5 shows an operation flow of the imaging device 50-7. The compression unit 310 compresses the moving image data indicating the moving image captured by the imaging unit 300 based on the correlation between the frames (S500). The compression rate detection unit 320 detects a compression rate indicating the ratio of the data size reduced by the compression to the data size before compression in the moving image data compressed by the compression unit 310 (S510).

  The transmission unit 330 transmits the detected compression rate to other imaging devices, for example, the imaging device 50-8 and the imaging device 50-9 (S520). The compression rate receiving unit 340 receives the compression rate of the moving image data in the other imaging device of the imaging device 50-7, for example, the imaging device 50-8 and the imaging device 50-9 (S530).

  When the compression rate detected by the compression rate detection unit 320 is lower than the compression rate received from the imaging device 50-8 and the imaging device 50-9 (S540: YES), the moving image output unit 350 performs compression by the compression unit 310. The obtained moving image data is output to the moving image selection / output device 40 (S550).

  FIG. 6 shows an example of moving image data. The moving image data shown in the figure conforms to, for example, the MPEG standard, and may include a header portion indicating the start of a data group and a GOP (Group of Picture) portion indicating a predetermined number of frames. .

  The GOP unit includes an I picture indicating data compressed in a frame without using a correlation between frames, a P picture indicating a difference between the I picture, and a B picture indicating a difference between the I picture or the P picture. Including.

  In this example, the compression rate detection means 210 uses the data size of the I picture relative to the data size of the I picture as the compression rate indicating the data size reduced by compression with respect to the data size before compression based on the correlation between frames. The ratio of the data size obtained by subtracting the data size of the B picture or the P picture is detected. Thereby, the compression rate detection means 210 can easily reduce the compression rate of the compression processing based on the correlation between frames by regarding that the compression rate by intra-frame compression is the same for the I picture and the B picture or P picture. Can be calculated.

  Alternatively, the compression rate detection unit 210 may calculate the data size before compression based on the resolution of the moving image and the number of frames. In this case, the compression rate detection unit 210 may calculate the data size of the received moving image data with respect to the calculated data size before compression as the compression rate. Thereby, the compression rate can be calculated more accurately.

  FIG. 7 shows an example of a moving image captured by the imaging device 50-1. (A) shows the frame which imaged before the movement of the imaging object, (b) shows the frame which imaged after the imaging object moved. The imaging device 50-1 may capture a moving image as a plurality of objects, for example, an object 700 indicating a person, an object 710 indicating a background, and an object 720 indicating a background. In this case, the moving image receiving unit 200 receives moving image data for each object. Then, the compression rate detection unit 210 detects the compression rate for each object.

  The selection output unit 240 includes the one object including the object 700 when the compression ratio of one object in one moving image, for example, the compression ratio of the object 700 is lower than the compression ratio of another object in another moving image. Select moving image data. That is, when the imaging apparatus 50-1 captures an image of a person whose posture has been changed due to movement or a person whose distance from the imaging apparatus has changed as the object 700, the selection output unit 240 has a compression rate of the object 700. Since it falls, the moving image data imaged by the imaging device 50-1 can be selected.

The selection output unit 240 may select the moving image data including the object 710 when the compression rate of the object 710 is lower than the compression rate of the object in other moving images. That is, when the imaging device 50-1 images a portion of the object 710 that is concealed by the object 700, the selection output means 240 is imaged by the imaging device 50-1 because the compression rate of the object 710 decreases. Selected moving image data can be selected.
Thereby, the moving image selection output device 20 can appropriately select moving image data that is highly necessary to be monitored, such as moving image data obtained by imaging the movement of a person.

  FIG. 8 is a block diagram showing a modification of the moving image selecting / outputting device 20. The moving image selection output device 20 in this example further includes a transmission instruction transmission unit 250, compared to the moving image selection output device 20 shown in FIG. Further, unlike the moving image selection output device 20 shown in FIG. 2, the moving image selection output device 20 may not include the compression rate detection unit 210, the imaging range information storage unit 220, and the movement direction detection unit 230. . In addition, the modification shown in this figure can also comprise the modification of the moving image selection output device 30 and the moving image selection output device 40. That is, each of the moving image selection output device 30 and the moving image selection output device 40 may have substantially the same configuration as the moving image selection output device 20 shown in the present modification.

  The compression rate acquisition means 215 is reduced by compression with respect to the data size before compression for each of a plurality of moving image data captured by each of the imaging devices 50-1 to 50-3 and compressed based on the correlation between frames. The compression ratio indicating the data size ratio is acquired and sent to the transmission instruction transmission means 250.

  The transmission instruction transmission unit 250 transmits the captured moving image data to an imaging apparatus that has captured moving image data having a compression rate lower than that of the other moving image data in a predetermined imaging period among the plurality of moving image data. A transmission instruction to transmit to the moving image selection output device 20 is transmitted. The moving image receiving unit 200 receives moving image data from the imaging device as a response to the transmission instruction. Then, the selection output unit 240 transmits the moving image data received by the moving image reception unit 200 to the moving image selection output device 40 as a response to the transmission instruction.

  FIG. 9 shows an operation flow in a modified example of the moving image selecting / outputting device 20. The compression rate acquisition means 215 is reduced by compression with respect to the data size before compression for each of a plurality of moving image data captured by each of the imaging devices 50-1 to 50-3 and compressed based on the correlation between frames. A compression rate indicating a data size ratio is acquired (S900). The transmission instruction transmission unit 250 transmits the captured moving image data to an imaging apparatus that has captured moving image data having a compression rate lower than that of the other moving image data in a predetermined imaging period among the plurality of moving image data. A transmission instruction to transmit to the moving image selection output device is transmitted (S910).

  The moving image receiving unit 200 receives moving image data as a response to the transmission instruction from any of the imaging devices 50-1 to 50-3 (S920). Then, the selection output unit 240 outputs the moving image data received as a response to the transmission instruction to the moving image selection output device 40 (S930).

  As described above, the moving image selection output device 20 according to the present modification acquires the compression rate from the imaging devices 50-1 to 50-3 prior to the acquisition of moving image data. Then, the moving image selection output device 20 acquires only necessary moving image data from any of the imaging devices 50-1 to 50-3. Thereby, compared with the Example demonstrated in FIGS. 1-7, the traffic of a network can further be reduced.

  FIG. 10 shows an example of a hardware configuration of a computer 400 that functions as the moving image selection output device 20 according to a program. The computer 400 includes a CPU peripheral unit having a CPU 1000, a RAM 1020, a graphic controller 1075, and a display device 1080 connected to each other by a host controller 1082, a communication interface 1030 connected to the host controller 1082 by an input / output controller 1084, a hard disk drive 1040 and an input / output unit having a CD-ROM drive 1060, and a legacy input / output unit having a ROM 1010, a flexible disk drive 1050 and an input / output chip 1070 connected to the input / output controller 1084.

  The host controller 1082 connects the RAM 1020 to the CPU 1000 and the graphic controller 1075 that access the RAM 1020 at a high transfer rate. The CPU 1000 operates based on programs stored in the ROM 1010 and the RAM 1020, and controls each unit. The graphic controller 1075 acquires image data generated by the CPU 1000 or the like on a frame buffer provided in the RAM 1020 and displays it on the display device 1080. Alternatively, the graphic controller 1075 may include a frame buffer that stores image data generated by the CPU 1000 or the like.

  The input / output controller 1084 connects the host controller 1082 to the communication interface 1030, the hard disk drive 1040, and the CD-ROM drive 1060, which are relatively high-speed input / output devices. The communication interface 1030 communicates with an external device via a network such as a fiber channel. The hard disk drive 1040 stores programs and data used by the computer 400. The CD-ROM drive 1060 reads a program or data from the CD-ROM 1095 and provides it to the input / output chip 1070 via the RAM 1020.

  The input / output controller 1084 is connected to the ROM 1010 and relatively low-speed input / output devices such as the flexible disk drive 1050 and the input / output chip 1070. The ROM 1010 stores a boot program executed by the CPU 1000 when the computer 400 is started up, a program depending on the hardware of the computer 400, and the like. The flexible disk drive 1050 reads a program or data from the flexible disk 1090 and provides it to the input / output chip 1070 via the RAM 1020. The input / output chip 1070 connects various input / output devices via a flexible disk 1090 and, for example, a parallel port, a serial port, a keyboard port, a mouse port, and the like.

  The program provided to the computer 400 is stored in a recording medium such as the flexible disk 1090, the CD-ROM 1095, or an IC card and provided by the user. The program is read from the recording medium via the input / output chip 1070 and / or the input / output controller 1084, installed in the computer 400, and executed. The program may be installed and executed in the moving image selection output device 30, the moving image selection output device 40, or the imaging devices 50-7 to 9 through the communication interface 1030.

  For example, a program that causes the computer 400 to function as the moving image selection / output device 20 uses the moving image receiving unit 200 described with reference to FIGS. 1, 2, 4, 6, 7, 8, and 9. , Compression ratio detection means 210, compression ratio acquisition means 215, movement direction detection means 230, selection output means 240, and transmission instruction transmission means 250. The program may cause the hard disk drive 1040 to function as the imaging range information storage unit 220. The program that causes the imaging device 50-7 to function as the imaging device 50-7 described with reference to FIGS. 3 and 5 includes a CPU provided in the imaging device 50-7, the imaging unit 300, the compression unit 310, and the compression rate detection. Means 320, transmission means 330, compression rate reception means 340, and moving image output means 350 function.

  The program shown above may be stored in an external storage medium. As the storage medium, in addition to the flexible disk 1090 and the CD-ROM 1095, an optical recording medium such as a DVD or PD, a magneto-optical recording medium such as an MD, a tape medium, a semiconductor memory such as an IC card, or the like can be used. Further, a storage device such as a hard disk or a RAM provided in a server system connected to a dedicated communication network or the Internet may be used as a recording medium, and the program may be provided to the computer 400 via the network.

  As described above, the moving image selection output device 20 selects moving image data having a lower compression rate in the compression processing based on the correlation between frames among the plurality of moving image data captured by the plurality of imaging devices. Select and output. As a result, it is possible to easily detect that there is a movement in the imaging target, so that the burden on the supervisor can be reduced and the amount of data transmitted to the network can be reduced.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

FIG. 1 is a block diagram of a moving image selection / output system 10. FIG. 2 is a block diagram of the moving image selection / output device 20. FIG. 3 is a block diagram of the imaging device 50-7. FIG. 4 shows an operation flow of the moving image selecting / outputting device 20. FIG. 5 shows an operation flow of the imaging device 50-7. FIG. 6 shows an example of moving image data. FIG. 7 shows an example of a moving image captured by the imaging device 50-1. FIG. 8 is a block diagram showing a modification of the moving image selecting / outputting device 20. FIG. 9 shows an operation flow in a modified example of the moving image selecting / outputting device 20. FIG. 10 illustrates an example of a hardware configuration of a computer 400 that functions as the moving image selection output device 20.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Moving image selection output system 20 Moving image selection output device 30 Moving image selection output device 40 Moving image selection output device 50 Imaging device 200 Moving image receiving means 210 Compression rate detection means 215 Compression rate acquisition means 220 Imaging range information storage means 230 Movement Direction detection means 240 Selection output means 250 Transmission instruction transmission means 300 Imaging means 310 Compression means 320 Compression rate detection means 330 Transmission means 340 Compression rate reception means 350 Movie output means 400 Computer 700 Object 710 Object 720 Object

Claims (11)

A moving image selection output device that selects and outputs a moving image captured by any of a plurality of imaging devices,
A compression ratio indicating a ratio of a data size reduced by compression with respect to a data size before compression for each of a plurality of moving image data captured by each of the plurality of imaging devices and compressed based on a correlation between frames. Compression rate acquisition means for acquiring;
Selection output means for selecting and outputting moving image data having a lower compression rate than other moving image data during a predetermined imaging period among the plurality of moving image data captured by the plurality of imaging devices; A moving image selection output device. Moving image receiving means for receiving the moving image data compressed based on the correlation between frames from each of the plurality of imaging devices;
Compression ratio detecting means for detecting a compression ratio indicating a ratio of the data size reduced by compression with respect to the data size before compression in each of the plurality of moving image data received;
The compression rate acquisition unit acquires the compression rate detected by the compression rate detection unit,
The selection output unit selects and outputs moving image data having a lower compression rate than other moving image data during the imaging period among the plurality of moving image data received by the moving image receiving unit. The moving image selection output device according to 1. The moving image data includes an I picture indicating data compressed in a frame, a P picture including data indicating a difference between the I picture, and a B picture including data indicating a difference between the I picture or the P picture. And compressed data based on a predetermined standard,
The compression rate detection unit detects a ratio of a data size obtained by subtracting a data size of the B picture or the P picture from a data size of the I picture to a data size of the I picture as the compression rate. The moving image selection output device described. The moving image is composed of a plurality of objects,
The moving image receiving means receives the moving image data for each object,
The compression rate detection means detects the compression rate for each object,
The selection output means selects the one moving image data when the compression rate of one object in one moving image data is lower than the compression rate of another object in other moving image data. Video selection output device. The captured moving image data is transmitted to the moving image selection output device with respect to the imaging device that captured the moving image data having a lower compression rate than the other moving image data during the imaging period among the plurality of moving image data. A transmission instruction transmission means for transmitting a transmission instruction to that effect,
The moving image selection output device according to claim 1, wherein the selection output means outputs the moving image data received as a response to the transmission instruction. 2. The moving image according to claim 1, wherein the selection output device selects moving image data having a compression rate significantly lower than that of other moving image data during a predetermined imaging period among the plurality of moving image data. Selective output device. The selection output means selects moving image data having the smallest compression rate from among the plurality of moving image data and moving image data obtained by imaging a predetermined range centered on an imaging range of the moving image data The moving image selection output device according to claim 1. A moving direction detecting means for detecting a moving direction in which the imaging target moves based on at least one of the plurality of moving image data;
The selection output means captures moving image data having the smallest compression ratio among the plurality of moving image data and an imaging range adjacent to the moving direction from an imaging range of an imaging apparatus that captured the moving image data. The moving image selection output device according to claim 5, wherein the moving image data of the device is selected and output. A moving image selection output system including a plurality of moving image selection output devices that select and output moving image data indicating a moving image captured by any of a plurality of imaging devices,
Each of the first moving image selection output device and the second moving image selection output device,
For each of a plurality of moving image data captured by each of a plurality of imaging devices and compressed based on a correlation between frames, a compression ratio indicating a ratio of a data size reduced by compression to a data size before compression is acquired. Compression rate acquisition means for
Selection output means for selecting and outputting moving image data whose compression rate is lower than other moving image data in a predetermined period of the plurality of moving image data;
The third moving image selection / output device comprises:
Moving image receiving means for receiving moving image data from each of the first moving image selection output device and the second moving image selection output device;
Compression rate acquisition means for acquiring the compression rate for each of the moving image data selected by each of the first moving image selection output device and the second moving image selection output device; and the first moving image. Of the moving image data selected by each of the image selection output device and the second moving image selection output device, moving image data having a lower compression rate than other moving image data in a predetermined period is selected. And a selection output means for outputting. A moving image selection output system comprising a plurality of imaging devices and selecting and outputting a moving image captured by any of the plurality of imaging devices,
Each of the plurality of imaging devices is
Compression means for compressing moving image data indicating a captured moving image based on a correlation between frames;
Compression rate detection means for detecting a compression ratio indicating a ratio of the data size reduced by the compression to the data size before compression in the moving image data compressed by the compression means;
Transmitting means for transmitting the compression rate to another imaging device;
Compression rate receiving means for receiving a compression rate of moving image data in another imaging device in the moving image selection output system;
A moving image selection unit that outputs the moving image data compressed by the compression unit when the detected compression rate is lower than the compression rate of another imaging device in the moving image selection output system; Output system. A program that causes a computer to function as a moving image selection output device that selects and outputs a moving image captured by any of a plurality of imaging devices,
The computer,
A compression ratio indicating a ratio of a data size reduced by compression with respect to a data size before compression for each of a plurality of moving image data captured by each of the plurality of imaging devices and compressed based on a correlation between frames. Compression rate acquisition means for acquiring;
A program that functions as selection output means for selecting and outputting moving image data having a lower compression rate than other moving image data during a predetermined imaging period among the plurality of moving image data.

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