JP5005607B2 - Monitoring system and event recording method - Google Patents

Description

  The present invention relates to an event recording method for recording image information including image data obtained by imaging a predetermined area, and a monitoring system for recording image information using the event recording method.

In recent years, a monitoring system for recording image information including image data obtained by imaging a predetermined area is provided in various places such as a company, a store, and an elevator.
For example, in a conventional monitoring system, image information including image data captured at a predetermined time interval (for example, every 2 seconds) is recorded, and a period until the storage means is used up is relatively short, and storage by an operator is performed. It takes a lot of time to change the means.
In addition, as an example of a monitoring system that appropriately determines image information to be recorded and realizes a longer recording time, image information from a monitoring camera is buffered in a ring memory, and a predetermined area of the screen is used as a motion detection area. A monitoring system for setting a motion detection area is known. In this monitoring system, a pre-recording that records image information for n seconds before the occurrence of the trigger and a post that records image information for m seconds after the occurrence of the trigger is triggered by the time point when the motion in the motion detection area is detected. Recording is performed and the amount of image information to be recorded is reduced.

In addition, in order to record more information at the time of abnormality detection (at the time of motion detection), the conventional technique described in Patent Document 1 uses a moving image coding method including a motion compensation circuit to detect abnormality (motion detection). ), And a time lapse recorder having an abnormality detection function is disclosed in which the recording interval (imaging interval) is changed short when an abnormality is detected, or the recorded image quality is changed to a high quality.
Moreover, in the prior art described in Patent Document 2, in order to efficiently record a broadcast program or the like (record with a smaller amount of data), two screens of a parent screen and a child screen are displayed during playback, Image information for the main screen and image information for the sub screen are recorded. The image information for the main screen has a large amount of information as a still image, and in order to reduce the amount of data, the frame information is reduced based on the motion detection result of the original image information without reducing the number of pixels. The number of drops is increased to increase the recording interval (for example, recording at 0.5 frame / second). In addition, the image information for the child screen has a large amount of information as a moving image, and the number of pixels is greatly reduced in order to reduce the data amount, but frame dropping is performed based on the motion detection result of the original image information. The image data of a small screen is reduced and recorded (for example, the number of pixels is set to 1/16). Thereby, the amount of data to be recorded is reduced.
JP 2000-013744 A JP-A-10-155134

In the prior art described in Patent Document 1, when applied to a monitoring system that records image information in which changes have occurred (motion is detected), there is a lot of wasteful image information that does not need to be recorded without detecting motion. Since the amount of data to be recorded is not reduced, the recordable time is short.
In the prior art described in Patent Document 2, image information for a main screen that emphasizes recording as a still image and image information for a sub-screen that emphasizes recording as a moving image are recorded. There are cases where two pieces of image information are recorded with respect to time, and there is a possibility that waste will occur in the recording of image information.
In addition, a conventional monitoring system that performs pre-recording and post-recording by detecting a motion in a specific area records the amount of data to be recorded by recording only image information within a certain period before and after the motion is detected. Although it is reduced, image information that does not need to be recorded without being detected even during this fixed period may be recorded, and therefore wasteful image information is recorded.
The present invention was devised in view of the above points, and can more appropriately determine image information to be recorded and image information that does not need to be recorded, thereby reducing the amount of data. Thus, it is an object to provide a monitoring system and an event recording method in which an operation time for recording image information is longer.

As means for solving the above-mentioned problems, the first invention of the present invention is a monitoring system as described in claim 1.
The monitoring system according to claim 1, an imaging unit that sequentially generates image information including field-unit or frame-unit image data obtained by imaging a predetermined area at predetermined timing and header information related to the image data; and the image When the information is sequentially input and the movement of the object is detected in the first motion detection area set in an arbitrary area of the screen based on the image data included in the input image information, the first trigger information The first motion detection means to be added to the header information of the information, and the image information is sequentially input, and in an arbitrary area different from the first motion detection area on the screen by the image data included in the input image information When the movement of the object is detected within the set second motion detection area, the second trigger information is input to the image information. The second motion detection means to be added to the image information, the storage means capable of recording the image information, and the image information processed by the first motion detection means and the second motion detection means are inputted and inputted. Control means for recording image information in a storage means, and the header information is provided with date and time information relating to the date and time at the time of imaging.
Then, the control means sets a post-trigger period until the first predetermined time elapses from the imaging time point of the image information to which the first trigger information is given, as the recording period, and the image information corresponding to the recording period In the monitoring system, a predetermined number of pieces of image information after the image information to which the second trigger information is added is recorded in the storage unit.

Moreover, the 2nd invention of this invention is the monitoring system as described in Claim 2.
The monitoring system according to claim 2, imaging means for sequentially generating image information including field-unit or frame-unit image data obtained by imaging a predetermined area at a predetermined timing and header information related to the image data, and the image When the information is sequentially input and the movement of the object is detected in the first motion detection area set in an arbitrary area of the screen based on the image data included in the input image information, the first trigger information The first motion detection means to be added to the header information of the information, and the image information is sequentially input, and in an arbitrary area different from the first motion detection area on the screen by the image data included in the input image information When the movement of the object is detected within the set second motion detection area, the second trigger information is input to the image information. Second motion detecting means for adding to the image information, storage means for recording the image information, temporary storage means for temporarily storing image information for a second predetermined time in the past from the present time, and the first motion Control means for inputting image information processed by the detection means and the second motion detection means, and storing the input image information in the storage means, and the header information includes a date and time related to the date and time at the time of imaging. Information is given.
The control means includes a post-trigger period until the first predetermined time elapses from the imaging time point of the image information to which the first trigger information is assigned, and the image information to which the first trigger information is assigned. A pre-trigger period that is traced back by a second predetermined time from the imaging time point is set as a recording period, and the image information corresponding to the recording period is near the image information to which the second trigger information is assigned. The monitoring system records a predetermined number of image information in the storage means.

A third aspect of the present invention is an event recording method as set forth in the third aspect.
In the event recording method according to claim 3, image information including image data in a field unit or a frame unit in which a predetermined area is imaged at a predetermined timing is sequentially generated, and is included in the sequentially generated image information. An arbitrary area of the screen based on image data is set as a first motion detection area that generates a first trigger when an object motion is detected in the area, and the first motion detection area on the screen based on the image data A region different from the region is set as a second motion detection region that generates a second trigger when the movement of an object is detected in the region.
Then, a post-trigger period from when the first trigger occurs until the first predetermined time elapses is set as a recording period, and after the second trigger is generated from the image information captured during the recording period This is an event recording method for recording a predetermined number of pieces of image information.

According to a fourth aspect of the present invention, there is provided the event recording method according to the fourth aspect.
5. The event recording method according to claim 4, wherein image information including field-unit or frame-unit image data obtained by imaging a predetermined area at a predetermined timing is sequentially generated, and is included in the sequentially generated image information. An arbitrary area of the screen based on image data is set as a first motion detection area that generates a first trigger when an object motion is detected in the area, and the first motion detection area on the screen based on the image data Is set as a second motion detection area that generates a second trigger when a motion of an object is detected in the area, and image information for a second predetermined time in the past from the current time is temporarily stored. Remember me.
A post-trigger period from when the first trigger occurs until a first predetermined time elapses and a pre-trigger period that goes back by a second predetermined time from the time when the first trigger occurs And recording a predetermined number of pieces of image information in the vicinity of the image information where the occurrence of the second trigger is detected from the image information captured during the recording period.

A fifth aspect of the present invention is an event recording method as set forth in the fifth aspect.
The event recording method according to claim 5 is the event recording method according to claim 3 or 4, wherein when the second trigger does not occur in the recording period, the event recording method is selected from the image information of the recording period. This is an event recording method for recording a predetermined number of pieces of image information.

A sixth aspect of the present invention is an event recording method as set forth in the sixth aspect.
The event recording method according to claim 6 is the event recording method according to any one of claims 3 to 5, and further, the generation of the first trigger from the image information captured during the recording period. This is an event recording method in which a predetermined number of image information is recorded later, or a predetermined number of image information in the vicinity of the image information where the occurrence of the first trigger is detected is recorded.

A seventh aspect of the present invention is an event recording method as set forth in the seventh aspect.
The event recording method according to claim 7 is the event recording method according to any one of claims 3 to 6, wherein the first motion detection area is smaller than an entire area of the screen based on the image data. And the second motion detection area is an entire area of the screen based on the image data, or the first motion detection area is an entire area of the screen based on the image data, and the second The motion detection area is an event recording method that is a specific area smaller than the entire area of the screen based on the image data.

According to the monitoring system of claim 1, the recording period should be set by the first trigger information, and a predetermined number of image information after the second trigger information should be recorded within the recording period. Image information and image information that does not need to be recorded are determined more appropriately. In particular, even during the recording period, image information in which no movement of the object is detected in the second motion detection area is not recorded.
As a result, the amount of data to be recorded can be reduced, and a monitoring system with a longer operation time can be realized.

  Further, according to the monitoring system of the second aspect, the image information captured before the first trigger and before the second trigger can be recorded in the monitoring system according to the first aspect. Therefore, it is possible to realize a monitoring system that can more appropriately record the monitoring area as image information and has a longer operation time.

According to the event recording method of claim 3, a recording period is set by the occurrence of the first trigger, and a predetermined number of pieces of image information after the occurrence of the second trigger are recorded within the recording period. Image information to be determined and image information that does not need to be recorded are more appropriately determined. In particular, even during the recording period, image information in which no movement of the object is detected in the second motion detection area is not recorded.
Thereby, the data amount recorded when the event occurs (when the first and second triggers occur) can be made smaller.

Further, in the event recording method according to claim 4, the image information captured before the occurrence of the event (occurrence of the first and second triggers) is recorded as compared with the event recording method according to claim 3. It is possible to record the state before the event occurs.
Thereby, the state at the time of event occurrence can be recorded more appropriately as image information.

According to the event recording method of the fifth aspect, the first trigger is generated, but the image information can be appropriately recorded even when the second trigger is not generated.
Thereby, it is possible to avoid a state in which the first trigger is generated but no image information is recorded.

  According to the event recording method of the sixth aspect, by reliably recording the image information in which the first trigger has occurred, even when the second trigger has not occurred when the first trigger occurs, This is convenient because the state in which the first trigger is generated can be confirmed without fail.

  According to the event recording method of the seventh aspect, it is possible to appropriately set the first motion detection area and the second motion detection area in accordance with the status of the area to be monitored.

The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 shows an example of a schematic block diagram of a monitoring system 1 using the event recording method of the present invention.
● [Configuration of monitoring system 1 (Fig. 1)]
As shown in FIG. 1, the monitoring system 1 includes an imaging unit 10, a first motion detection unit 21, a second motion detection unit 22, and a storage unit 30. The storage unit 30 includes control means 40, temporary storage means 50, storage means 60, and input means 70. The display unit 80 is used to display a screen on which the image information recorded in the storage unit 30 is reproduced, and is connected when necessary.
The imaging means 10 is, for example, a CCD camera, images a monitored area at predetermined time intervals, and sequentially generates and outputs image information including field-unit or frame-unit image data and a header that is information related to the image data. . The header information is provided with date / time information regarding the date / time at the time of imaging.

When the first motion detection means 21 detects the movement of an object in the first motion detection area set in an arbitrary area of the screen based on the image data included in the input image information, the first motion detection means 21 First trigger information is assigned to corresponding header information. An operator or the like can set a first motion detection area in the first motion detection means 21 via the control means 40 by inputting an arbitrary area from the input means 70. Further, the operator or the like can also set a threshold (sensitivity) or the like for detecting a motion in the first motion detection area from the input unit 70.
In the second motion detection area set in an arbitrary area of the screen based on the image data included in the input image information (set in an area different from the first motion detection area), the second motion detection means 22 When the movement of the object is detected, the second trigger information is added to the header information corresponding to the image data. An operator or the like can set a second motion detection area in the second motion detection means 22 via the control means 40 by inputting an arbitrary area from the input means 70. Further, the operator or the like can also set a threshold (sensitivity) or the like for detecting a motion in the second motion detection area from the input unit 70.
The worker or the like sets the first motion detection area and the detection sensitivity of the first motion detection means 21 and the second motion detection area and the detection sensitivity of the second motion detection means 22 separately. Can do.

The temporary storage means 50 is, for example, a ring buffer (RAM or the like), and the control means 40 writes the first input image information at the head of the temporary storage means 50. Then, the control means 40 recognizes the position where the next image information is to be written, and the control means 40 sequentially writes the inputted image information toward the end of the temporary storage means 50, and when the end is reached, The next image information is overwritten at the top and written, and the image information is written one after another in a ring shape. Thereby, the temporary storage means 50 can temporarily store a certain amount of image information in the past from the current time (for example, image information for a second predetermined time or more).
The storage means 60 is, for example, an HDD (Hard Disk Drive), and image information is written and read from the control means 40. The storage unit 60 has a larger capacity than the temporary storage unit 50 and stores image information to be recorded. However, no matter how large the storage means 60 is, image information is recorded one after another in the monitoring system. Therefore, after several days, the storage means 60 has no free capacity and image information cannot be recorded. Before that happens, the operator replaces the storage means 60 and continues monitoring, but it is preferable that the storage means 60 be replaced less frequently.
As will be described later, the monitoring system 1 described in the present embodiment appropriately selects image information to be recorded and image information that does not need to be recorded, and reduces the amount (number) of image information to be recorded. Thus, continuous operation for a longer time is possible.

● [Method for reducing the amount of image information to be recorded (FIGS. 2 to 4)]
Next, a method for reducing image information to be recorded will be described with reference to FIGS.
In the present embodiment described below, a description will be given by taking as an example a monitoring system in which the imaging means 10 is provided on the ceiling in the elevator and the person in the elevator is monitored.
In this case, when the image information from the imaging unit 10 is reproduced on the display unit 80, the screen G shown in the example of FIG. 3 is displayed. Here, for example, an area that becomes a part of the elevator door DR is set as the first motion detection area A1, and an entire area of the image in the elevator EV is set as the second motion detection area A2. In the example of FIG. 3, H1 and H2 are persons who are on the elevator.
Then, a predetermined period including the time point when the motion is detected in the first motion detection area A1 is set as the recording period, and a predetermined number of pieces of image information in the vicinity of the time point when the movement is detected in the second motion detection area A2 in the recording period. Record in the storage means 60.
When the control unit 40 detects that the first trigger information is added to the header information included in the image information, the control unit 40 confirms that the motion is detected in the first motion detection area A1 when the image information is captured. recognize. When it is detected that the second trigger information is added to the header information, it is recognized that a motion is detected in the second motion detection area A2 when the image information is captured. Further, the date and time at which the image information is captured can be recognized from the date and time information included in the header information.

(1) Operation when there is no elevator user and the elevator is stopped The imaging means 10 images the EV in the elevator at a predetermined timing (for example, at a predetermined time interval), sequentially generates image information, and generates the generated image information. The data are sequentially output to the first motion detection means 21.
The first motion detection means 21 determines whether or not there is an object motion in the first motion detection area A1 of the screen based on the image data included in each sequentially input image information (for example, the previous image). It is determined whether there is a change from the information (object movement)). In this case, since the door DR is not moving, the image information is sequentially output to the second motion detection unit 22 without adding the first trigger information to the header information of the image information.
The second motion detection means 22 determines whether or not there is an object movement in the second motion detection area A2 of the screen based on the image data included in each sequentially input image information (for example, the previous image). It is determined whether there is a change from the information (object movement)). In this case, since there is no moving object in the elevator EV, the image information is sequentially output to the control unit 40 without adding the second trigger information to the header information of the image information.
The control unit 40 sequentially stores the sequentially input image information in the temporary storage unit 50 and determines whether or not the first trigger information is added to the header information of each image information. In this case, since the first trigger information is not given, the control unit 40 does not record the image information in the storage unit 60.

(2) Operation when at least one person gets on and off The imaging unit 10 images the EV in the elevator at a predetermined timing to sequentially generate image information, and sequentially outputs the generated image information to the first motion detection unit 21.
The first motion detection means 21 determines whether or not there is an object motion within the first motion detection area A1 of the screen based on the image data included in the input image information. Here, as shown in the example of FIG. 2, the door DR opens and closes in the image information with the date and time information T [i], and the movement of the object is detected in the first motion detection area A1, and the date and time information is T [i. The first trigger information is added to the header information of the image information. Each piece of image information is sequentially output to the second motion detector 22.
The second motion detection means 22 determines whether or not there is a movement of an object in the second motion detection area A2 of the screen based on the image data included in each sequentially input image information. Here, as shown in the example of FIG. 2, there is a movement of the users in the elevator in the image information whose date and time information is T [i−3], T [i + 2], T [i + 7], and T [i + 11] The movement of the object is detected in the second motion detection area A2, and the second trigger is set in the header information of each image information of the date and time information T [i-3], T [i + 2], T [i + 7], T [i + 11]. Information shall be given. Each image information is sequentially output to the control means 40.

When the image information whose date information is T [i] is input, the control means 40 determines that the first trigger information is added to the header information of the image information. And the control means 40 is provided with the first trigger information and the post-trigger period until the first predetermined time elapses from T [i] that is the imaging time point of the image information to which the first trigger information is assigned. A pre-trigger period that is traced back by a second predetermined time from T [i], which is the image information capturing time, is set as a recording period. In the example of FIG. 2, the past period from T [i−5] to T [i] is set to the first trigger period, and the future period from T [i] to T [i + 10] is set to the post-trigger period. An example is shown.
Then, the control means 40 reads the image information from T [i-5] to T [i] from the temporary storage means 50, and determines whether or not the second trigger information is given. In the case of the example in FIG. 2, it is determined that the second trigger information is assigned to T [i-3]. Then, the control unit 40 records a predetermined number of pieces of image information in the vicinity of the image information to which the second trigger information is assigned in the storage unit 60. In the case of the example in FIG. 2, three pieces of image information before and after the image information to which the second trigger information is added (in this case, T [i-4], T [i-3], T [i-2 ] Is recorded.

Note that the image information from T [i + 1] to T [i + 10] is image information that does not yet exist at the time of T [i], and therefore second trigger information is added each time image information is input. If the second trigger information is given, a predetermined number of pieces of image information in the vicinity of the image information to which the second trigger information is given is recorded in the storage unit 60. In this case, when the image information of T [i + 2] is input, it is determined that the second trigger information is added, and the image information of T [i + 1] and T [i + 2] is recorded in the storage unit 60. [I + 3] image information is recorded in the storage means 60 when T [i + 3] image information is input. The image information of T [i + 7] is recorded in the same manner. Since the image information of T [i + 11] is not within the recording period, it is not recorded in the storage means 60 even if the second trigger information is given.
In this way, not all the image information within the recording period is recorded, but the image information in which no motion is detected even within the recording period is not recorded as “image information that does not need to be recorded”. The amount (number) of image information can be reduced, and the continuous operation time of the monitoring system 1 can be made longer.
In the example of FIG. 2, the first trigger information is added to the image information of T [i], but the second trigger information is not added, so the image information of T [i] is recorded. Absent. However, T [i] image information to which the first trigger information is attached or a predetermined number of image information in the vicinity of the T [i] image information may also be recorded.

In the above description, an example in which there is image information in which the second trigger information is added to the image information in the recording period has been described. However, image information in which the second trigger information is added to the image information in the recording period is described. There may be no case. In this case, as shown in FIG. 4, it is determined that the first trigger information is assigned at T [i], but the second period is between the recording periods (T [i−5] to T [i + 10]). There is no image information to which trigger information is attached. In such a case, when the image information of T [i + 10] is input, the control unit 40 receives the image information to which the second trigger information is added during the recording period (T [i-5] to T [i + 10]). If it is determined that there is no image information, a predetermined number of pieces of image information are extracted from the image information within the recording period (temporarily stored in the temporary storage unit 50) and recorded in the storage unit 60 (the input image information is recorded). (Thin out (drop frame) and remember). 4 shows an example in which four pieces of image information T [i−5], T [i], T [i + 5], and T [i + 10] are extracted and recorded in the storage unit 60.
Thereby, it is possible to avoid a state in which the first trigger is generated but no image information is recorded.

  In the above description, the temporary storage unit 50 is provided and the past image information traced back for the second predetermined time from the time of occurrence of the first trigger can be recorded. However, the temporary storage unit 50 is omitted, Only future image information from the time of occurrence of the first trigger may be recorded. In this case, in FIG. 2 and FIG. 4, the recording period is only the first predetermined time (post-trigger period), and image information that can be recorded can be recorded only after the second trigger. In the case of the timing of the first trigger and the timing of the second trigger in the example of FIG. 2, the image information of T [i + 2], T [i + 3], T [i + 7], T [i + 8] is recorded in the storage unit 60, and T Image information of [i-4], T [i-3], T [i-2], T [i + 1], and T [i + 6] is not recorded in the storage unit 60.

● [Apply to event recording method]
As described above, the image information reduction method used in the monitoring system 1 described in the present embodiment can be applied to various systems that are not limited to the monitoring system by using the event recording method described below. is there.
Image information including image data in field units or frame units in which a predetermined area is imaged at a predetermined timing is sequentially generated using an imaging unit or the like.
An arbitrary area of the screen based on the image data included in the sequentially generated image information is set as a first motion detection area that generates a first trigger when the movement of an object is detected in the area.
In addition, in an arbitrary area of the screen, an area different from the first motion detection area is set as a second motion detection area that generates a second trigger when a motion of an object is detected in the area.
A post-trigger period from when the first trigger occurs until the first predetermined period elapses is set as the recording period.
An event recording method for recording a predetermined number of pieces of image information after the occurrence of the second trigger from image information captured during the recording period can be applied to various systems.

If temporary storage means is used, image information before the occurrence of a trigger can also be recorded.
In the event recording method described above, temporary storage means capable of temporarily storing image information for a second predetermined time in the past from the present time is used.
In addition, a pre-trigger period that is traced back for a second predetermined time from the time when the first trigger occurs is added to the recording period.
An event recording method for recording a predetermined number of pieces of image information in the vicinity of the image information in which the occurrence of the second trigger is detected from the image information captured during the recording period, and is applied to various systems. Can do.

In the example described with reference to FIGS. 2 to 4, the first motion detection area A1 is an area smaller than the entire screen area, and the second motion detection area A2 is the entire screen. Or vice versa. Further, both may be set to the same entire screen or the same region and set to different detection sensitivities. In addition, both may be set to different small areas, and the detection area and the detection sensitivity may be appropriately set according to the monitoring target, the monitoring level, and the like.
Also, the image information within the recording period, the image information that is determined not to be recorded is not recorded, but the header information is left, and the image data is the information that “no data” is left. May be recorded. In this case, the amount of data increases slightly (although only image information having a very small size than normal image information increases), but “no data” is recognized when reproducing the image information during the recording period. By performing reproduction so as not to update the image data, it is possible to easily perform reproduction without feeling uncomfortable with the passage of time.

The monitoring system 1 of the present invention is not limited to the configuration, operation, etc. described in the present embodiment, and various changes, additions, and deletions can be made without changing the gist of the present invention.
In the description of the example of FIG. 2, the example in which three pieces of image information including the immediately preceding image information and the immediately following image information including the image information to which the second trigger information is added has been described, but the number is limited to three. Is not to be done. Further, only n pieces of image information before the second trigger information may be recorded, or only m pieces of image information after the second trigger information may be recorded.
The numerical values used in the description of the present embodiment are examples, and are not limited to these numerical values.

It is a schematic block diagram explaining one embodiment of monitoring system 1 of the present invention. It is a figure explaining the method to reduce the quantity of the image information to record. It is a figure explaining the example of a monitoring area, 1st motion detection area | region A1, and 2nd motion detection area | region A2. It is a figure explaining the example when the 2nd trigger does not generate | occur | produce within a recording period.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Monitoring system 10 Imaging means 21 1st motion detection means 22 2nd motion detection means 30 Storage unit 40 Control means 50 Temporary storage means 60 Storage means 70 Input means 80 Display means

Claims (7)

Imaging means for sequentially generating image information including field unit or frame unit image data obtained by imaging a predetermined area at a predetermined timing and header information related to the image data;
When the image information is sequentially input and the motion of the object is detected in the first motion detection area set in an arbitrary area of the screen based on the image data included in the input image information, the first trigger information is First motion detection means to be added to the header information of the image information;
The image information is sequentially input, and the movement of the object is detected in the second motion detection area set in an arbitrary area different from the first motion detection area on the screen based on the image data included in the input image information. Second motion detection means for providing second trigger information to the header information of the image information when detected;
Storage means capable of recording the image information;
Control means for inputting image information processed by the first motion detection means and the second motion detection means and recording the input image information in a storage means;
The header information is provided with date and time information regarding the date and time at the time of imaging,
The control means includes
Setting a post-trigger period until a first predetermined time elapses from the imaging time of the image information to which the first trigger information is given, as a recording period;
From the image information corresponding to the recording period, a predetermined number of image information after the image information to which the second trigger information is given is recorded in the storage unit.
Monitoring system. Imaging means for sequentially generating image information including field unit or frame unit image data obtained by imaging a predetermined area at a predetermined timing and header information related to the image data;
When the image information is sequentially input and the motion of the object is detected in the first motion detection area set in an arbitrary area of the screen based on the image data included in the input image information, the first trigger information is First motion detection means to be added to the header information of the image information;
The image information is sequentially input, and the movement of the object is detected in the second motion detection area set in an arbitrary area different from the first motion detection area on the screen based on the image data included in the input image information. Second motion detection means for providing second trigger information to the header information of the image information when detected;
Storage means capable of recording the image information;
Temporary storage means for temporarily storing image information for a second predetermined time in the past from the present time;
Control means for inputting image information that has been processed by the first motion detection means and the second motion detection means, and storing the input image information in a storage means;
The header information is provided with date and time information regarding the date and time at the time of imaging,
The control means includes
A post-trigger period until the first predetermined time elapses from the imaging time point of the image information to which the first trigger information is given, and a second predetermined time period from the imaging time point of the image information to which the first trigger information is given. Set the recording period to minutes and the trigger pre-trigger period.
Recording a predetermined number of pieces of image information in the vicinity of the image information to which the second trigger information is given from the image information corresponding to the recording period in the storage unit;
Monitoring system. Sequentially generate image information including image data in field units or frame units in which a predetermined area is imaged at a predetermined timing;
An arbitrary area of the screen based on the image data included in the sequentially generated image information is set as a first motion detection area that generates a first trigger when movement of an object is detected in the area,
A region different from the first motion detection region on the screen based on the image data is set as a second motion detection region that generates a second trigger when an object motion is detected in the region,
A post-trigger period from when the first trigger occurs until the first predetermined time elapses is set as a recording period;
A predetermined number of pieces of image information after the occurrence of the second trigger is recorded from the image information captured during the recording period;
Event recording method. Sequentially generate image information including image data in field units or frame units in which a predetermined area is imaged at a predetermined timing;
An arbitrary area of the screen based on the image data included in the sequentially generated image information is set as a first motion detection area that generates a first trigger when movement of an object is detected in the area,
A region different from the first motion detection region on the screen based on the image data is set as a second motion detection region that generates a second trigger when an object motion is detected in the region,
Furthermore, the image information for the second predetermined time in the past from the present time is temporarily stored,
A post-trigger period from when the first trigger occurs until a first predetermined time elapses and a pre-trigger period that is traced back by a second predetermined time from the time when the first trigger occurs are set as recording periods And
Recording a predetermined number of pieces of image information in the vicinity of the image information in which the occurrence of the second trigger is detected from the image information captured during the recording period;
Event recording method. The event recording method according to claim 3 or 4, wherein
If the second trigger does not occur during the recording period,
A predetermined number of image information is recorded from the image information of the recording period.
Event recording method. The event recording method according to any one of claims 3 to 5,
Furthermore, a predetermined number of image information after the occurrence of the first trigger is recorded from among the image information captured during the recording period, or a predetermined number near the image information where the occurrence of the first trigger is detected. Record image information,
Event recording method. The event recording method according to any one of claims 3 to 6,
The first motion detection area is a specific area smaller than an entire area of the screen based on the image data, and the second motion detection area is an entire area of the screen based on the image data.
Alternatively, the first motion detection area is an entire area of the screen based on the image data, and the second motion detection area is a specific area smaller than the entire area of the screen based on the image data.
Event recording method.

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