JP2001052264A - Image transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To optionally set the order of images sent to an image center device according to the installation state of a sensor and a camera when the sensor generates an alarm in watch mode. SOLUTION: An image transmission device is equipped with a current image memory 20 and an operation mode table 21. When the sensor generates an alarm in watch mode, the current image memory 20 transmits a still picture (current image) currently picked up by the camera corresponding to the sensor. The operation mode table 21 makes it possible to optionally set the order of images sent when the crime preventive sensor generates an alarm in watch mode and the ID numbers of sensors or cameras and the transmission order of images are registered by sensors or cameras. Then a controller 9 transmits the images in the image transmission order registered for the sensor in the operation mode table 21 when the sensor generates an alarm in watch mode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image transmission apparatus for monitoring a monitoring area with a monitoring camera and transmitting an image captured by the monitoring camera to a security center via a telephone line when an abnormality occurs in the monitoring area. About.

[0002]

2. Description of the Related Art Conventionally, as a security system, a security system in which an image transmission device installed at a security destination and an image center device installed at a security center side are connected by a public telephone line is known. Hereinafter, a configuration example of the image transmission device used in such a security system will be schematically described.

FIG. 3 shows a configuration example of an image transmission apparatus. In the figure, ₁ 1, 1 _2, 1 _3, 1 ₄ surveillance camera (hereinafter, simply referred to as camera), 2 _{1, 2} 2, 2 _3, 2 ₄ are intrusion detection sensor (hereinafter, simply referred to as a sensor), 3 Is a switch, 4 is A / D
A converter 5, a field memory, 6 a compressor, 7 an image memory, 8 a line controller, 9 a control device, 10 an image transmission device, 11 an operation device, and L a telephone line.

[0004] tenant building, the camera ₁ is in a predetermined position of the monitoring area that has been the subject of security such as office buildings,
1 _2, 1 _3, 1 ₄ is installed. In addition, sensors 2 ₁ , 2 are located at predetermined positions in the monitored area to be guarded.
_2, 2 _3, 2 ₄ are installed, these sensors 2 ₁ -
The output of the 2 ₄ is input to the control unit 9. These sensors ₂₁ to _24, a heat ray sensor for detecting a moving object, it is possible to use a magnet various sensors such as switches for detecting that the window and door is opened, in the following For the sake of convenience, it is assumed that all sensors are heat ray sensors.

[0005] Then, the camera ₁ 1 to 1 ₄ and the sensor 2 ₁ -
Associated and 2 _4. Which camera corresponds to which sensor is registered in the control device 9 in advance. This camera and the correspondence between the sensor can be determined arbitrarily, where the camera 1 ₁ for ease of understanding, 1 _2, 1 _3, 1 _4, respectively sensors 2 _1,
2 _2, 2 _3, 2 ₄ and associated to that.

[0006] The camera ₁ 1, 1 _2, 1 _3, 1 and each ID number is assigned to the _4, similarly, the sensor 2 _{1, 2} 2, 2 _3, 2 ₄ to be respectively the ID number is assigned Have been. Here, a case in which four cameras and four sensors are provided will be described, but the following description is the same in a case where five or more cameras and sensors are provided, or in a case where three or less sensors are provided.

[0007] The camera ₁ 1, 1 _2, 1 _3, 1 ₄ is operating normally, the image signals from these cameras ₁ 1 to 1 ₄ are input to each switch 3. Subsequent The switch 3 are those that are configured in the switch circuit, the control device by a control signal from the 9, is switched to always cyclically every time determined the image signals from the camera 1 ₁ to 1 ₄ in advance Output.

[0008] Now, assuming that the image signal captured by the camera 1 ₁ switch 3 is selected, the image signal output from the camera 1 ₁ during this period and the digital image data by the A / D converter 4 Then, one field is extracted and written into the field memory 5 once. Then, the image data is read from the field memory 5, compressed by the compressor 6, and written to the image memory 7.

As a method of compressing the image data in the compressor 6, any method may be used, but it is desirable to use a generally widely used method such as JPEG or MPEG. For example, application software that can handle image data compressed by JPEG or MPEG is widely distributed.

[0010] The above process is the completed switch 3 is switched to select the image signal from the camera 1 _2, the process facilities described above for the image signal from the camera 1 ₂ output from the switch 3 Is done. And so forth, by which such processing is repeated, the camera 1 ₁ to 1 ₄
The data of the image picked up in the
Will be written to.

The writing and reading operations of the field memory 5 and the compression operation of the compressor 6 are controlled by a control signal from a control device 9. Note that FIG.
In the above, the field memory 5 is used, but a frame memory may be used instead of the field memory 5.

The image memory 7 stores a predetermined number of images.
It has a memory capacity capable of storing data. Image memo
The image data stored in the memory 7 must be in a compressed state.
Is as described above. And the memo of the image memory 7
The region is R₁ , R_Two , R_Three, R_Four Divided into four areas
And each of these divided regions R₁ , R_Two , R
_Three , R_Four Is the camera 1₁ , 1_Two , 1_Three , 1_Four 
Set as an area to store image data from
ing. This setting is registered in the control device 9.

Therefore, the camera 1 is switched by the switch 3.₁ Imaged at
When an image signal is selected, the image signal is A
Digitized by the A / D converter 4 and one field in it
Is extracted and written into the field memory 5 once.
And read out from the field memory 5 and
The data is compressed and the R₁ Write to area
Will be. Similarly, the switch 1 switches the camera 1_Two Imaging with
If the selected image signal is selected,
The image data of one field extracted from inside is finally
R of the image memory 7_Two Is written to the area. With switch 3
Camera 1_Three , 1 _Four The image signal captured in is selected
The same applies to the case.

Each of the divided areas R ₁ , R ₂ , R ₃ ,
Capacity of R ₄ are all the same. That is, the memory area of the image memory 7 is what is equally divided into four areas of _{R 1, R 2, R 3} , R 4. Then, each divided area R ₁ , R
₂ , R ₃ and R ₄ are capacities capable of storing image data of a predetermined number of images. Here, each divided region R
_It is assumed that ₁ , R ₂ , R ₃ , and R ₄ have a capacity to store image data of m images.

The image memory 7 is as described above.
FIG. 1 conceptually shows a conventional area division of the image memory 7. Immediately
Conventionally, as shown in FIG.
Memory area is R₁ , R_Two , R_Three , R_Four Four divisions
Are divided into equal regions, and each of these divided regions R₁ , R_Two ,
R_Three , R_Four Has a camera 1₁ , 1_Two , 1_Three , 1
_Four Compressed image data of m images from
Have been.

When the image data of m images is stored in a certain divided area in the image memory 7, the control device 9 stores the next image data in the divided area. The oldest image data in the image data stored in the divided area is deleted, and the image data of the next new image is stored in the free space.

The line controller 8 bidirectionally exchanges various data with an image center device (not shown in FIG. 3) installed at a security center of a security company. . Further, the line control unit 8 is provided with an internal memory having the same capacity as the capacity of one divided area of the image memory 7.

The control device 9 controls the overall operation of the image transmission device 10 and is composed of a processing unit and its peripheral circuits. Further, as is apparent from the above description, the control device 9 manages the addresses of the divided areas R ₁ , R ₂ , R ₃ , and R ₄ of the image memory 7, and controls the addresses written in the divided areas. Manages image data addresses.

The operating device 11 is for setting the operation mode of the control device 9, and here, it is assumed that two operation modes, a warning mode and a release mode, can be set. The operation device 11 corresponds to a device usually called a remote controller or the like. Although the operation device 11 is shown as being separate from the image transmission device 10 in FIG. 3, the operation device 11 may be integrated with the image transmission device 10. Although only one operating device 11 is shown in FIG. 3, this is a convenient measure to avoid complicating the drawing and to facilitate understanding.
Actually, a plurality of operation devices 11 may be provided, specifically, for example, for each tenant, or for each security area.

Next, the image transmission apparatus 10 having the configuration shown in FIG.
The operation of will be described briefly. Now, it is controlled by the operation device 11.
It is assumed that the release mode is set in the control device 9. C
Sensor 2₁ ~ 2_Four Is constantly operating, so it detects human movement
Then, a signal indicating that a moving object has been detected (hereinafter, this signal
The signal is called the alarm signal, and the output of the alarm signal is issued.
I will call it. ) Is output, but the control device 9
Is set, the alarm signal is ignored.
In this case, the control device 9 switches the switch 3 at predetermined intervals.
It is just controlling to change. So the camera
1 ₁ ~ 1_Four The image signal from the
The digital signal is switched by the A / D converter 4
And the image data is written to the field memory 5
And read out from it, compressed by the compressor 6 and
The operation of writing to the corresponding divided area of the memory 7 is repeated.
It is done.

Next, the alert mode is set by the operating device 11.
The operation when the setting is performed will be briefly described. I
A warning mode is set in the control device 9 by the operation device 11.
Sensor 2 when set₁ Is issued. Above
As described above, the switching device 3 is always cyclically switched.
Switch 3, the camera 3_Two , 1_Three , 1_Four From
When the image signal is selected, the control device 9
These cameras 1 _Two , 1_Three , 1_Four Or
These image data are stored in the corresponding divided areas of the image memory 7.
Each of them is stored.

[0022] However, when the switch 3 selects the image signal from the camera 1 _1, the control unit 9, the sensor 2
After receiving the alarm signal from the _1, predetermined processing for writing the image data of one image each time the image signal from the camera 1 ₁ by switch 3 is selected in the divided region R ₁ of the image memory 7 Is repeated n (≦ m) times. This value of n is registered in the control device 9 in advance. Thus, after the alarm of the sensor 2 _1, and writes the image data of one image each time the image signal from the camera 1 ₁ by switch 3 is selected in the divided region R ₁ of the image memory 7 processing n times in repeated state, the image memory 7 to the dividing regions R _1, the sensor 2 ₁ image data of n images captured by the camera 1 ₁ is written after the alarm, the sensor 2 ₁ of alarm before This means that (mn) image data of the image has been written.

[0023] Then, the control unit 9, as described above, after the alarm of the sensor 2 _1, camera 1 ₁ by switch 3
Image signals from the writing image data of one image each time the chosen divided region R ₁ of the image memory 7 processes the n
Repeated times, written by reading the order that stores image data written in the divided region R ₁ to the internal memory of the line control unit 8. During this period, i.e., between the divided regions R ₁ to read the image data to the internal memory of the line control unit 8 finishes, the controller 9 stops the writing of image data into the divided regions R _1. Therefore,
Controller 9 is also an image signal is selected from the camera 1 ₁ by during which switch 3 is not write image data into the divided region R ₁ of the image memory 7. Readout of all image data stored in the divided region R _1,
Then, when the writing of the image data into the internal memory of the line control unit 8 is completed, the control device 9 sets the divided area R ₁
Resume writing of image data to.

Then, the control unit 9 generates security data indicating that an abnormality has occurred, passes the security data to the line control unit 8, and instructs transmission of image data and security data. As a result, the line control unit 8 transmits the security data and the image data to the image center device via the telephone line L. This is the processing of the abnormality notification.

At this time, when transmitting the image data, the line controller 8 transmits the image data in the order in which the image data is written in the internal memory. Therefore, for example, if it is assumed that image data of a total of four images are stored in each divided area of the image memory 7 and image data of two images are stored after the sensor is alerted, the line control Part 8 includes these 4
The image data of the images is transmitted in the order shown in FIG. In FIG. 5, the pre-alarm image 1 is the image data of the oldest image data among the image data stored in the divided area of the image memory 7. The pre-alarm image 2 is the image data of the image stored next to the pre-alarm image 1 and is the image data of the image immediately before the sensor issues the alarm. The post-warning image 1 is the image data of the image stored immediately after the sensor has fired. The post-warning image 2 is image data of an image stored next to the post-warning image 1, and is the newest image data among the images stored in the divided area.

The image data and security data transmitted from the line control unit 8 are received by the image center device and further expanded and displayed on the monitor. You can grasp the situation.

Here, what kind of information is transmitted as security data is arbitrary. For example, the ID number assigned to the image transmission apparatus 10, the ID number of the sensor that detected the abnormality, and the The information may include information such as information shown, the number of images to be transmitted, and the like.

[0028] Although the sensor 2 ₁ has been described as being alarm is the same even when the other sensor has alarm.

[0029]

However, in the conventional image transmission apparatus, as described above, the order of images transmitted when the sensor issues a warning in the alert mode is determined by the order of the image memory 7 for all cameras. Since the order is fixedly set in the order stored in the divided areas, there is a problem that it is not possible to flexibly cope with the situation of the place where the sensor and the camera are installed.

That is, depending on the place where the sensor and the camera are installed, as before, the image stored first is transmitted before the sensor emits, and then the image stored after the sensor is emitted is transmitted. In some cases, it is only necessary to transmit in the order stored, but the image before the sensor is alerted,
The image after the alarm may be issued later, and the user may want to transmit the current image first to confirm the current situation. In some cases, first, the image after the alert of the sensor is transmitted, and the image before the alert of the sensor is sufficient.

As described above, there is a request to change the order of images to be transmitted to the image center device according to the situation where sensors and cameras are installed, when a sensor issues a warning in the alert mode. The conventional one cannot meet such a demand.

Therefore, according to the present invention, according to the situation of the place where the sensor and the camera are installed, the alert is sent to the image center device when the sensor is issued in the alert mode, but the order of the images is set as desired. It is an object of the present invention to provide a possible image transmission device.

[0033]

In order to achieve the above object, an image transmission apparatus according to the present invention is connected to a security sensor and a surveillance camera associated with the security sensor. An image transmission device that transmits an image captured by a surveillance camera corresponding to the security sensor when an alarm is issued, wherein the order of images transmitted when the security sensor is issued in the alert mode is determined by the security sensor or the monitor. It can be set arbitrarily for each camera.

[0034]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an embodiment of an image transmission apparatus according to the present invention. In the figure, reference numeral 20 denotes a current image memory, and reference numeral 21 denotes an operation mode table. In FIG. 1, the same components as those shown in FIG. 3 are denoted by the same reference numerals.

The current image memory 20 is for transmitting image data of a still image (hereinafter, referred to as a current image) which is currently taken by a camera corresponding to the sensor when the sensor issues an alert in the alert mode. The storage of image data in the current image memory 20 and the reading of image data from the current image memory 20 are controlled by the control device 9. This current image memory 20
May be sufficient if image data of at least one image can be stored in a data compressed state. Here, it is assumed that image data of one image can be stored in a data compressed state. The usage of the current image memory 20 will be described later.

In this image transmission apparatus, the order of images transmitted when the security sensor issues a warning in the alert mode can be set arbitrarily. The operation mode table 21 is provided for this purpose. It is.

The operation mode table 21 includes at least
The sensor ID number or camera ID number and the image transmission order are registered for each sensor or each camera. An example is shown in FIG. In FIG. 2, the transmission order for the sensor with the ID number 1 is “image before alarm → image after alarm”.
Is registered. This is because, in the alert mode, when a sensor whose ID number is 1 issues an alert, first, the sensor in the image data stored in the divided area of the camera corresponding to the sensor in the image memory 7 issues an alert. Transmitting the image data of the image stored before performing the processing, and then transmitting the image data of the image stored after the sensor has been issued among the image data stored in the divided area, and terminating the processing. Means. This is the same as the conventional transmission order described above. In FIG. 2, the same transmission order is set even when a sensor whose ID number is 3 issues an alarm.

It is registered that the transmission order for the sensor having the ID number 2 is “post-report image → current image → pre-report image”. This is because, in the alert mode, when the sensor whose ID number is 2 issues an alert, first, the sensor in the image data stored in the divided area of the camera corresponding to the sensor in the image memory 7 emits the alert. After transmitting the stored image, the current image captured by the camera associated with the sensor is transmitted, and after the transmission of the current image is completed, the image stored before the sensor is notified is transmitted. This means that image data is transmitted and the process ends. The transmission of the current image may be terminated by transmitting a command for instructing the termination of the transmission of the current image from the image center device. That is, the current image transmitted from the image transmission device is received by the image center device and displayed on the monitor, but when the operator of the image center device observes the current image and determines that the current image is no longer needed. By operating the input means of the image center apparatus, a command instructing the end of transmission of the current image is transmitted.

Further, in FIG. 2, it is registered that the transmission order for the sensor having the ID number 4 is “current image → image before alarm → image after alarm”. This is because when the sensor whose ID number is 4 issues an alert in the alert mode,
First, the current image currently captured by the camera associated with the sensor is transmitted, and when the transmission of the current image is completed, the image memory 7 in the image data stored in the divided area of the camera corresponding to the sensor in the image memory 7 is transmitted. This means that the image data of the image stored before the sensor is issued is transmitted, and then the image data of the image stored after the sensor is issued in the divided area of the image memory 7 is transmitted, and the process ends. ing.

In the example of the operation mode table shown in FIG.
The image transmission order is determined for the sensor ID number.
However, the order of transmitting images is determined for the camera ID number.
It is natural that they may be used. Because the above
As mentioned above, sensors and cameras are associated
is there. Note that, also in this case, the camera 1₁ , 1_Two , 1_Three , 1 _Four 
Is the sensor 2₁ , 2_Two , 2_Three , 2_Four And map
It will be described as having been performed.

[0041] Next, the operation of the image transmission apparatus shown in FIG. 1, the operation mode table 21 is as shown in FIG. 2, IDN number 1 of the sensor 2 _1, sensor 2
₂ of ID number 2, the ID number of the sensor 2 ₃ 3, ID number of the sensor 2 ₄ is assumed to be 4. The image memory 7
Is divided into regions as shown in FIG. 4, and as described above,
After the sensor issues a warning in the alert mode, image data of n images is written.

[0042] First, since the operation during release mode is the same as the conventional description will be omitted, but the operation of the time alert mode, if the operation mode table 21 is as shown in FIG. 2, the sensor 2 ₁ operation when the alarm, and operation when the sensor 2 ₃ is the alarm will be omitted the description is the same as the prior art, the operation when the sensor 2 ₂ was alarm in the following, the sensor 2 ₄ alarm Only the operation when this is done will be described.

Now, the control device 9 is operated by the operation device 11.
Sensor 2 when alert mode is set_Two Fired
Suppose. As described above, the switch 3 is always cycled.
Switch 3 is connected to the camera 1₁ ,
1_Three , 1_Four If an image signal from
The control device 9 controls these cameras 1 in the same manner as described above.
₁ , 1_Three , 1_Four Image data from image memory 7
A process is performed to store the data in each of the divided areas.

[0044] However, when the switch 3 selects the image signal from the camera 1 _2, the control unit 9, the sensor 2
After receiving the alarm signal from the _2, predetermined processing for writing the image data of one image each time the image signal from the camera 1 ₂ by switch 3 is selected in the divided region R ₂ of the image memory 7 Is repeated n times. When finished writing to the divided region R ₂ of the image data of n images after alarm sensors 2 _2, the controller 9 temporarily suspends the writing of image data into the divided regions. Note that the corresponding divided area interruption of the writing of image data to the R ₂ is continued from the image center device until it receives a command indicating the end of transmission of the current image.

Then, the control device 9 determines that the divided area R ₂
Of the n images after the sensor alert is read out from the image data written in the order in which they are stored and written into the internal memory of the line control unit 8, and security data indicating that an abnormality has occurred is output. The security data is generated and passed to the line control unit 8 to instruct transmission of image data and security data. As a result, the line control unit 8 transmits the security data and the image data to the image center device via the telephone line L. The image data and security data are received by the image center device, further expanded and displayed on the monitor, so that the operator of the image center device can grasp the situation after the occurrence of the abnormality.

[0046] After completion of the transmission of the image data of the image after the sensor onset report, the control unit 9, when time is selected image signal from the camera 1 ₂ switch 3, the image data current Write to the image memory 20. Therefore, the image signal from the camera 1 ₂ this time is digitized by the A / D converter 4, once written in the field memory 5 one field therein is extracted, and is read out from the field memory 5 The data is compressed by the compressor 6 and written into the current image memory 20. When the writing of the image data of one current image to the current image memory 20 is completed, the control device 9 reads the image data of the current image from the current image memory 20 and stores the read image data in the internal memory of the line control unit 8. Instructs writing and transmission. As a result, the image data of the current image is transmitted from the line control unit 8 to the image center device.

This operation is repeated until a command indicating the end of transmission of the current image is received from the image center device.

Thereafter, when a command indicating the end of transmission of the current image is transmitted from the image center device, the command is received by the line control unit 8 and passed to the control device 9. The control device 9 ends the above operation by the command,
Internal memory of the divided region R in the image data written in the _2, sensor alarm prior to (m-n) pieces of read to the order storing image data of an image line control unit 8 of the image memory 7 And instruct transmission. As a result, the line control unit 8 transmits the image data of the image before the sensor is issued to the image center device via the telephone line L.

When the transmission of the image data is completed, the control device 9 ends the abnormality notification processing.

The above is the operation in the case where the sensor 2 ₂ to the warning mode has been alarm, Next, the sensor 2 to the warning mode
The operation when the alarm ₄ is issued will be described.

In this case, the switch 3 is connected to the camera 1₁ , 1_Two ,
1_Three If you have selected the image signal from the
Reference numeral 9 denotes these cameras 1 in the same manner as described above.₁ , 1
_Two , 1 _Three Image data from the image memory 7
A process for storing the information in each of the divided areas is performed.

[0052] However, when the switch 3 selects the image signal from the camera 1 _4, the control unit 9, the sensor 2
After receiving the alarm signal from the _4, predetermined processing for writing the image data of one image each time the image signal from the camera 1 ₄ by switch 3 is selected in the divided region R ₄ of the image memory 7 Is repeated n times. When finished writing to the divided region R ₄ of the image data of n images after the alarm of the sensor 2 _4, the controller 9 temporarily suspends the writing of image data into the divided regions. This divided area R ₄
The interruption of the writing of the image data to the CPU is continued until a command indicating the end of the transmission of the current image is received from the image center device.

[0053] Then, the control unit 9, after the alarm of the sensor 2 _4, the writing of n pieces of image data of the image into the divided regions R ₄ is completed, first, the transmission of the current picture. At this time, the controller 9, when time is selected image signal from the camera 1 ₄ switch 3 and writes the image data in the current image memory 20. Therefore, the image signal from the camera 1 ₄ this time is digitized by the A / D converter 4, once written in the field memory 5 one field therein is extracted, and is read out from the field memory 5 The data is compressed by the compressor 6 and written into the current image memory 20. When the writing of the image data of one current image to the current image memory 20 is completed, the control device 9 reads the image data of the current image from the current image memory 20 and stores the read image data in the internal memory of the line control unit 8. At the same time, security data indicating that an abnormality has occurred is generated, and the security data is passed to the line control unit 8 to instruct transmission of image data and security data. Thus, the image data of the current image and the security data are transmitted from the line control unit 8 to the image center device.

This operation is repeated until a command indicating the end of transmission of the current image is received from the image center device.

Thereafter, when a command indicating the end of transmission of the current image is transmitted from the image center device, the command is received by the line control unit 8 and passed to the control device 9. The control device 9 ends the above operation by the command,
All of the image data written in the divided region R ₂ of the image memory 7, i.e., the sensor alarm prior to (m-n) pieces of image data, and the image of the n images after sensor onset report image The data is read out in the stored order, written to the internal memory of the line control unit 8, and transmitted. As a result, the line control unit 8 transmits the image data of the image before the sensor issuance and the image data of the image after the sensor is issued to the telephone line L.
To the image center device via the.

Then, when the transmission of the image data is completed, the control device 9 ends the processing of the abnormality notification.

As described above, according to this image transmission apparatus, the order of images to be transmitted to the image center apparatus when a sensor issues a warning in the alert mode can be arbitrarily set for each sensor or camera. Therefore, it is possible to flexibly cope with a situation where sensors and cameras are installed.

As described above, one embodiment of the present invention has been described, but the present invention is not limited to the above embodiment, and various modifications are possible.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an embodiment of an image transmission device according to the present invention.

FIG. 2 is a diagram illustrating a configuration example of an operation mode table illustrated in FIG. 1;

FIG. 3 is a diagram illustrating a conventional configuration example of an image transmission device.

FIG. 4 is a diagram conceptually illustrating an example of area division of an image memory in a conventional image transmission device.

FIG. 5 is a diagram for explaining the order of images transmitted to the image center device when a sensor issues a warning in the alert mode in the conventional image transmission device.

[Explanation of symbols]

1 ₁ , 1 ₂ , 1 ₃ , 1 ₄ … surveillance camera 2 ₁ , 2 ₂ , 2
₃ , 2, ₄ ... security sensor, 3 ... switcher, 4 ... A / D converter, 5 ... field memory, 6 ... compressor, 7 ... image memory, 8 ... line controller, 9 ... controller, 10 ... image Transmission device, 11: operation device, 20: current image memory, 21: operation mode table, L: telephone line.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H04N 7/18 H04N 7/18 DF term (reference) 5C054 AA01 DA09 EA01 FE01 FE22 GA04 GB02 GD06 GD09 HA18 5C084 AA02 AA07 AA08 AA16 BB01 BB31 CC02 CC08 CC16 CC19 DD12 DD22 DD42 EE04 FF04 FF27 GG07 GG09 GG13 GG18 GG39 GG42 GG52 GG78 HH12 5C087 AA02 AA04 AA09 BB12 BB74 DD05 DD23 EE06 FF01 FF04 FF23 GG13 GG13 GG13 GG13 GG13 GG03 GG23 GG03 GG03 GG02 GG03 GG03 GG02 GG03 GG03 GG03 NN18 NN21 PP03 RR12

Claims (1)

[Claims] A security sensor and a monitoring camera associated with the security sensor are connected, and when the security sensor issues an alert in the alert mode, an image captured by the monitoring camera corresponding to the security sensor is transmitted. An image transmission device, wherein the order of images transmitted when a security sensor emits an alert in a security mode can be arbitrarily set for each security sensor or surveillance camera.