TW201635248A - Method for processing image signals in response to security event and related security system - Google Patents

Abstract

The disclosure is related to a method for processing image signals in response to security event, and a security system implementing the method. The system exemplarily includes a security host and a connected digital video recorder, hereinafter DVR. As the DVR is in operation, the DVR dynamically adjusts encoding parameters for recording the video according to security event signals sent by the security host. The security event signals indicate a specific event class. Then the instant video is recorded with the adjusted encoding parameters. For example, the DVR records video with lower-quality encoding parameters before receiving the security event signals. When the DVR acknowledges the security event, the DVR records the video with better quality by adjusting the encoding parameters to higher level. Therefore, the recording time can be extended with the limited storage space.

Description

Preservation event video signal processing method and its security system

The invention relates to a security event image signal processing method and a security system thereof, in particular to an image signal processing method and a related security system capable of dynamically adjusting coding parameters according to a security event.

In the prior art, the security system is often used as a record entry and exit event, or a solution for detecting an abnormal event at a specific location; another method is to use a camera to monitor a specific location, and to achieve anti-theft through image monitoring and video recording. The purpose of preservation.

In the conventional technology of a digital video recorder (DVR) in a general security system, a digital video recorder is connected to one or more terminal photography devices, installed in a specific occasion and in and out of the entrance, and the entrance and exit may be provided with a swipe card or It is an access control device for controlling incoming and outgoing personnel. The incoming and outgoing signals will be managed and recorded by the security host in the system. The control center personnel will monitor the image data of the digital video recorder to determine whether the incoming and outgoing personnel are inspected through the image. There are abnormal conditions and can be dispatched at any time.

Take the above-mentioned security personnel in and out of the security equipment and the monitoring equipment responsible for live video recording. Once the monitoring personnel finds an abnormal event on the monitoring screen, the control center will be notified by the traditional communication means such as telephone or network to dispatch the security personnel to the site. deal with. In the prior art, the security system and the monitoring system using digital image monitoring are two independent operating systems. If mutual communication is required, the communication is achieved by the general traditional communication.

Compared with the analog image recording equipment in the past, the Digital Image Recorder (DVR) provides stable and longer-lasting image storage, which provides real-time monitoring of the system and subsequent event playback. Especially in the case of security considerations, it is necessary to record 24 hours a day. Therefore, the hardware storage space of the video signal is very large. If the storage space is not large enough, it is more likely to be needed in addition to periodically replacing the storage medium (such as a hard disk). Abandoning the image data for a period of time in order to remove the storage space for continued recording.

The invention discloses a method for processing a security event video signal and a security system thereof. In addition to using a gateway technology to link the signals of the security system and the monitoring system, the digital device can dynamically set the digital alarm according to the detection of the security event in the security system. The image coding parameters of the image recorder can effectively save the use of the hardware storage space of the digital image recorder, thereby achieving the purpose of lengthening the recording time and effectively saving the space for the hardware.

According to an embodiment, the main steps of the image processing method for the security event image include: when a digital video recorder (DVR) receives the security event signal when performing the recording image, the digital image recorder stores the image signal encoding according to the security event signal. Parameters, and store the image signal with the set encoding parameters.

In this main step, according to an embodiment, the digital image recorder originally stores the video signal with a lower encoding parameter when the security event signal has not been received. For example, encoding parameters for storing lower quality images, encoding parameters for lower bit rates, or encoding parameters for lower resolution.

In an embodiment, after the digital image recorder receives the security event signal, the security event signal represents an event category, and thus can be dynamically set according to the event category. The encoding parameters of the image signal are stored. The storage medium of the digital video recorder records a plurality of event categories corresponding to a plurality of security event signals and one-to-one correspondence, and coding parameters corresponding to each event category.

In an embodiment of the security system for implementing the security event image signal processing method, the security system includes one or more security hosts, wherein each security host is coupled to at least one sensor, and one or more digital image recorders, and each digital image. The recorder is coupled to at least one security host, wherein each digital image recorder is coupled to at least one image sensor.

In order to further understand the technology, method and effect of the present invention in order to achieve the intended purpose, reference should be made to the detailed description and drawings of the present invention. The drawings and the annexed drawings are intended to be illustrative and not to limit the invention.

10‧‧‧Security host

101, 102, 103‧‧‧ Sensors

12‧‧‧Digital Image Recorder

121, 122, 123‧‧‧ image sensor

20‧‧‧Security host

201, 202, 203‧‧‧ Sensors

22‧‧‧Digital Image Recorder

221, 222, 223‧‧‧ image sensor

24‧‧ ‧ gateway

26‧‧‧Control Center

30‧‧‧Control Center

31, 32, 33, 34‧‧‧ security host

35, 36, 37, 38‧‧‧ digital image recorder

73‧‧‧Digital Image Recorder

75‧‧‧Guide system

701‧‧‧ camera

71‧‧‧In and out

703‧‧‧Access control device

77‧‧‧Security host

79‧‧‧Control Center

801‧‧‧ Sensor

803‧‧‧ camera

81‧‧‧Security host

823‧‧‧Control Center

805, 807‧‧ ‧ database

825‧‧‧Guide system

827‧‧‧Central Management System

89‧‧‧Digital Image Recorder

808, 809 ‧ ‧ security terminal

901‧‧‧Data Processing Unit

903‧‧‧Signal Management Unit

905‧‧‧Communication unit

907‧‧‧ memory unit

908‧‧‧ first communication interface

909‧‧‧Second communication interface

921‧‧‧Security host

923‧‧‧Control Center

925‧‧‧Guide system

927‧‧‧Central Management System

929‧‧‧Digital Image Recorder

910‧‧‧Management interface

Step S401~S407‧‧‧Video signal processing flow

Step S501~S509‧‧‧Video signal processing flow

Step S601~S611‧‧‧Video signal processing flow

1 is a schematic diagram of a security system architecture for performing a security event image signal processing method of the present invention; FIG. 2 is a second schematic diagram of a security system architecture for performing a security event image signal processing method of the present invention; FIG. 3 is a view showing a security event image signal for performing the present invention; FIG. 4 is a schematic diagram showing an embodiment of a method for processing a security event image signal according to the present invention; FIG. 5 is a second flowchart of an embodiment of a method for processing a security event image signal according to the present invention; Embodiment 3 of the method for processing the image signal processing method of the preservation event; FIG. 7 shows a security system for implementing the image processing method for the security event of the present invention One of the application schematic diagrams; FIG. 8 is a schematic diagram showing an embodiment of the security system of the present invention; and FIG. 9 is a schematic diagram showing an embodiment of the gateway system of the security system of the present invention.

In the field of security, a digital image recorder (DVR) for image surveillance is connected to one or more image sensors provided in various places, and image signals are obtained through each image sensor, and then collectively stored in a digital image recorder. The storage medium is usually a hard disk (HDD), so the storage space limitation of the storage medium naturally becomes a time limit for the digital image recorder to record the movie, which may cause a security hole caused by insufficient image retention time.

The invention provides a method for processing a security event image signal and a security system thereof, in particular, a method in which a digital image recorder can dynamically set (such as adjusting, switching, selecting, etc.) to store images according to the category of the security event, such as setting (adjustment, adjustment, Switching, selecting) the encoding parameters, thereby saving the storage space used when there is no security event, thereby effectively extending the recording time of the limited storage space.

One of the schematic diagrams of the security system architecture of the security event video signal processing method of the present invention can be referred to FIG. 1. FIG. 1 shows that in a system, the security host 10 is connected with several perceptrons 101, 102, and 103, such as the perceptrons 101, 102, and 103. The reed switch, the vibration sensor, the device operation sensor, the intrusion sensor, the smoke detector, the gas sensor, etc. of the entrance and exit are arranged in a plurality of different positions. This example shows that image sensors 121, 122, and 123 can be provided near each location, such as nearby cameras, to perform full-time photography of security requirements, and these image sensors 121, 122, and 123 are connected by wire or wirelessly. To the digital image recorder 12, the recorded image is stored by the digital image recorder 12.

In the related image processing method of the security event, the digital image recorder 12 continues to receive the image signals generated by the image sensors 121, 122, 123, but may be lower encoded, in the event that no security event is generally perceived. Parameter The storage of these image signals can save storage space without security events, and this part of the image is relatively unimportant. When the digital video recorder 12 obtains a certain security event from the security host 10, it sets a coding parameter for storing the corresponding location image according to the sensor location information (corresponding to an identification data), for example, increasing the encoding parameter. To store better quality image signals.

Since the digital image recorder 12 can dynamically set the encoding parameters of the stored image according to the specific security event of the security host 10, the recording time of the limited storage space can be effectively extended under the requirement of recording the full-time image.

Next, FIG. 2 is a schematic diagram showing another embodiment of a security system architecture for performing the preservation event video signal processing method of the present invention.

The illustrated security system includes a security host 20, which may in fact have one or more security hosts 20, and each security host is coupled to at least one perceptron, this example being shown with perceptrons 201, 202, 203. The system further includes a digital image recorder 22, which may actually have one or more digital image recorders 22, and each digital image recorder 22 is coupled to at least one image sensor 221, 222, 223 and can be connected to the security. Host 20. In another complicated security system, it is not excluded that the digital image recorder 22 can be connected to multiple security hosts 20; conversely, it is not excluded that a security host 20 is connected to a plurality of digital image recorders 22.

In this example, the security host 20 will connect to the control center 26 through a gateway 24. When one of the sensors 201, 202, 203 is triggered, the security host 20 generates a signal that can be secured by the gateway 24. The signal is passed to the control center 26. At this time, according to the embodiment of the invention disclosed in the disclosure, the digital image recorder 22 associated with the security signal dynamically sets the encoding parameters of the stored image signal, such as the encoding parameters when the image signal of the channel associated with the security signal is stored. The image signal related to the security signal is stored according to the set coding parameter. When the security signal is not generated, the image signal can be stored with a lower coding parameter. Conversely, when the security signal is confirmed, the coding parameter is further improved, and the image signal with better quality is stored. The encoding of the digital image recorder 22 when the security signal ends or is set to the initial condition The parameter will be adjusted back to the original parameter value.

For related facilities, reference may be made to the application diagram of the security system for implementing the security event image signal processing method of the present invention as shown in FIG.

The figure shows a digital video recorder 73 coupled to a camera 701 that captures the entrance and exit 71. The digital video recorder 73 continues to receive video signals captured by the camera 701. The digital video recorder 73 is connected to the security host 77. The security host 77 is provided with a sensor, such as the access device 703, in the vicinity of the entrance and exit 71.

When no security signal has been triggered yet, that is, when the access control device 703 does not have any trigger, the digital image recorder 73 stores the video signal with a lower encoding parameter, for example, with lower image resolution and lower bits. Saving video signals by means of a low rate, a small image size, etc., can save storage space.

When the security host 77 receives the signal of the access control device 703, it indicates that a security event is triggered, such as when a person enters or exits, or someone uses the access control device 703 incorrectly, or has an intrusion behavior, and the digital image recorder 73 is based on the security event signal. The encoding parameter for storing the image signal is set, for example, the image signal is stored with a higher encoding parameter, so that a higher quality image can be obtained before the security host 77 is set to the standby state.

The security host 77 can be connected to the control center 79 at the back end by a gateway system 75, and the video signal is transmitted to the control center 79 by this connection.

It is noted that, in order to integrate the originally independently operated security system with the monitoring system formed by the digital image recorder, the illustrated gateway system 75 is a signal that is placed between the security host 77 and the digital image recorder 73. The gateway can be implemented in various types, such as using software or firmware implemented on a specific hardware device to process signal transmission and conversion, and to contact the security system and the monitoring system so that the two independent systems can communicate with each other. , to achieve the effect of immediate monitoring, notification and preservation.

Through the integration of the gateway system 75, the backend control center 79 can quickly and immediately obtain the security signal of the security host 77 and the image signal of the digital image recorder 73.

3 shows another security system architecture for performing the security event video signal processing method of the present invention. The security system is provided with a control center 30, and can manage a plurality of security hosts 31, 32, 33, 34, and security hosts 31, 32, 33, 34 are respectively connected to the digital image recorders 35, 36, 37, 38. In a complex security system, the digital image recorder can be connected to a plurality of security hosts according to the design, and can dynamically set the encoding parameters of the stored image signals according to the event categories indicated by the plurality of security event signals. Conversely, the security host can connect multiple digital image recorders according to the design, which can get a more complete monitoring picture.

As shown in the system architecture, the control center 30 manages the multi-terminal system at the same time, whether it is the security signal generated by the security host 31, 32, 33, 34, or the image signal generated by the digital image recorders 35, 36, 37, 38. When a corresponding sensor is provided in each image sensor shooting position, the signal carries identification information that can confirm the security trigger position, that is, the image sensor and the related sensor record the identification data corresponding to the same place.

When the sensor senses a security event, the signal transmitted to the connected security host carries the identification data, so that the relevant digital image recorder can set the coding parameter according to the corresponding channel (corresponding to a specific location), and the control center 30 can also When receiving one of the signals to secure the host, the location of the trigger is confirmed based on the identification information contained in the signal.

The method for processing the image of the security event of the present invention can be implemented by using the architecture of each of the security systems described above. For the related embodiment, refer to FIG. 4 .

When the system is operating, in general, in step S401, the digital image recorder in the security system continuously records the image. At this time, in step S403, if no security event occurs, the image signal may be stored with a lower encoding parameter. This saves storage space.

The system can judge whether there is a security event signal at any time? (Step S405), when no security event is triggered (NO), step S401 to step S405 are continued; if it is determined that there is a security event (Yes), step S407 is performed, and the digital image recorder will use higher encoding parameters. Store and transfer image signals.

In the security system, the digital image recorder is connected to the security host signal, and when the digital image recorder performs recording of the image, it is ready to receive the security event signal at any time. When an event occurs, the digital image recorder stores the encoding parameters of the image signal according to the security event signal, such as adjusting a higher bit rate, better image quality (such as saturation, chroma, contrast), Larger image size (CIF, Common Intermediate Format), higher image resolution, higher frame per second (fps, Frame Per Second) or higher quality compression format. After that, the image signal is stored according to the set encoding parameters.

In an embodiment, when the security host learns a security event through the sensor, before the digital image recorder receives the security event signal, it may include a step of confirming whether the security event signal is a false alarm, and the process is as shown in FIG. 5.

Beginning as in step S501, when the sensor is triggered, the security host determines that it is a specific security event, and a security event signal is generated to the digital image recorder. However, at this time, as in step S503, the system will assist in confirming the preservation event and determine whether it is a false alarm. (Step S505). For example, it can be further judged by a nearby sensor, whether the sensor continuously triggers the same event within a set time, confirms the connection of the sensor, or can be artificially judged, etc., and then further confirms the preservation event category, such as whether it is one. Intrusion events, destruction events, equipment anomalies, toxic gas leakage events, fire incidents, etc.

When it is determined as a false alarm (Yes), proceeding to step S507, the security host continues to be on standby; if not false alarm (NO), in step S509, the security host transmits a security event signal to the digital image recorder, and the digital image recorder according to the set policy (criteria) Set (adjust, switch, or select) encoding parameters corresponding to various types of security events.

The embodiment includes: if a security system has multiple sensors and multiple image sensors, the security host determines the trigger position according to the signal when the triggering of a security event is triggered, and transmits the location along with the security event signal to the digital image. Recorder, the digital image recorder stores the image on the corresponding channel according to the trigger position setting The encoding parameters of the signal, and it is not necessary to set the encoding parameters for the image signals on all channels.

In another embodiment, as shown in FIG. 6 , when the digital image recorder sets the encoding parameter, different encoding parameters may be set according to the event category of the security event, that is, the event category indicates that the setting security event is set to multiple levels, from the emergency event. Non-emergency events can be distinguished by multiple levels of coding parameters; or different event security levels can be set according to different locations, and corresponding to different levels of coding parameters.

For example, each image sensor captures an image of a location with a corresponding one of the sensors, and each location can be set to a different security level for the security system. In the present invention, different levels of coding parameters can be provided. . Each image sensor and sensor can record identification data corresponding to the same place. When the sensor senses a security event, the signal transmitted to the security host carries the identification data, and can provide a digital image recorder to store and store the image of the corresponding location. Coding parameters.

The flow of the related embodiment is shown in FIG. 6.

Beginning in step S601, the digital image recorder records the image, and in general, in step S603, the image is stored with low encoding parameters. In step S605, when the digital video recorder is informed by the security host that the security event has been detected, the event category will be determined at this time, as in step S607.

The digital image recorder receives the security event signal from the security host, and each security event signal represents an event category, wherein the relationship may be in a lookup table or a database format recorded in a storage medium of the digital image recorder. The storage medium records a plurality of event categories in which a plurality of security event signals correspond to one-to-one, and coding parameters corresponding to each event category. Therefore, in step S609, the digital image recorder (where the software or the firmware means) sets the image channel encoding parameters according to the event category, and the setting manner includes dynamically adjusting the encoding parameters according to the event category; or in different encoding parameters of different levels. Switching; or select the corresponding encoding parameter by looking up the table. After that, the image signal stored by the set encoding parameter can be transmitted to the control center via the security host.

8 is a schematic diagram of an embodiment of the security system of the present invention. The architecture embodiment shown in this example is a security host 81 connected to a plurality of terminal-based sensors 801 at one end of the system, and the other end is controlled by a control center 823. Managed; the digital video recorder 89 is coupled to a plurality of cameras 803, one end of which is centrally managed 827 to form a monitored system.

In order to enable the digital video recorder 89 to obtain the security event signal of the security host 81, a gateway system 825 for transmitting a signal between the control center 823 of the security host 81 and the central management system 827 connected to the digital video recorder 89 is provided. The two subsystems are coupled through the gateway system 825, so that the digital video recorder 89 can set the encoding parameters for storing the video signals according to the security event signal transmitted by the security host 81.

In this architecture, one or more security hosts 81 are connected by the control center 823 to form a basic system for security. Each security host 81 is connected to one or more sensors 801. The control center 823 includes a database 805 for recording and accessing data data retrieved by each terminal sensor 801. Alternatively, the security terminal 808 can monitor the data through the monitor or the image signal transmitted through the gateway system 825.

In the architecture, a monitoring system consisting of a central management system 827 and one or more digital image recorders 89 is used to record static or dynamic images, which are captured by the terminal cameras 803. The video signal will be converted and recorded by the digital video recorder 89 and monitored by the security terminal 809 of the central management system 827 through the monitoring screen.

The central management system 827 also has a database 807 for storing image data. The medium image processing means can also adopt the technology of the present invention to set the encoding parameters according to the security event signal. The security terminal 809 can be viewed at any time or through the gateway system. The 825 is passed to the Control Center 823 for review by personnel of the security system.

Figure 9 further depicts an embodiment of a gateway system that interfaces with a security host and a control center, or between a control center and a central management system.

It shows the control center 923 connected to two independent systems and the gateway system 925 of the central management system 827. The gateway system 925 can be a soft or hard circuit hand. In the segment implementation, the gateway system 925 connects the two systems through different communication interfaces, including connecting to the control center 923 and the security host 921 by using the first communication interface 908, thereby receiving and forwarding the security signals generated by the security hosts.

The gateway system 925 is connected to the central management system 927 and the digital image recorders 929 through the second communication interface 909 to receive and transfer the monitoring signals generated by the digital image recorders 929.

The main implementation function module of the gateway system 925 includes a data processing unit 901, a signal management unit 903, a communication unit 905 and a memory unit 907, and further includes a communication unit 905 connected to the first communication interface 908 and the second communication interface 909 of the external system. The management interface 910 provides a remotely managed interface.

The control center 923 and the central management system 927 enable the digital video recorder 929 to smoothly obtain the security event signal generated by the security host 921 through the gateway system 925, wherein the data processing unit 901 is used to process the exchange with the control center 923 and central management. System 927 data signal.

Thus, the digital video recorder 929 can set the encoding parameters of the stored image according to the level of a certain event category indicated by the security event signal.

Therefore, according to the method for processing the security event image signal disclosed in the disclosure of the present invention, the method is mainly applied to a digital image recorder (DVR). In order to effectively save the storage space of the image signal, the related monitoring system will link the security host. Therefore, the digital image recorder can determine the storage strategy according to whether the security event is triggered. When the security event is confirmed, the image signal is stored in a better image quality processing manner, so that it can be effective without affecting the security purpose. Saves image space when no security events are triggered, so the effect is at least saves storage space, lengthens the recording time in limited storage space, and still provides the monitor to receive clearer after a specific security event. High resolution, smooth picture.

However, the above description is only a preferred embodiment of the present invention, and thus it is not intended to limit the scope of the patent of the present invention. The structural changes are all included in the scope of the present invention and are combined with Chen Ming.

S401‧‧‧Digital Image Recorder Recording Images

S403‧‧‧Storing images with low coding parameters

S405‧‧‧Is there any preservation of the incident signal?

S407‧‧‧Storage and transmission with high coding parameters

Claims (10)

A method for processing a security event image signal, comprising: a digital image recorder receiving a security event signal when performing a recorded image; and setting a coding parameter of the digital image recorder to store the image signal according to the security event signal, and setting the coding parameter Store image signals. The method for processing a security event image signal according to claim 1, wherein the digital image recorder stores the image signal with a lower encoding parameter before receiving the security event signal. The method for processing a security event video signal according to claim 2, wherein before the digital video recorder receives the security event signal, the method includes the step of confirming whether the security event signal is a false alarm. The method for processing a security event image signal according to claim 2 or 3, wherein after the digital image recorder receives the security event signal, the encoding parameter of the stored image signal is set according to the event category represented by the security event signal. The method for processing a security event video signal according to claim 4, wherein the encoding parameter is a bit rate, an image quality, a video resolution, a frame per second, or a compressed format. The method for processing a security event video signal according to claim 4, wherein the event category represented by the security event signal is recorded in a storage medium of the digital video recorder, and the storage medium records a plurality of multiple security event signals and a A pair of corresponding event categories, and encoding parameters corresponding to each event category. The method for processing a security event image signal according to claim 1, wherein the digital image recorder is connected to at least one image sensor that records the image signal, and the security event signal is generated by a security host connected to the digital image recorder. The method for processing a security event video signal according to claim 7, wherein each image sensor captures an image of a location of a corresponding one of the sensors, and the image sensor and the sensor record identification data corresponding to the same location; Perceptron perception In the case of a security event, the signal transmitted to the security host carries identification data, and the digital image recorder is provided to store encoding parameters of the corresponding location image. A security system for performing a security event video signal processing method according to any one of claims 1 to 8, wherein the security system comprises: one or more security hosts, wherein each security host is connected to at least one sensor; one or more a digital image recorder, each digital image recorder is coupled to at least one of the security hosts, wherein each digital image recorder is coupled to at least one image sensor; wherein the digital image recorder is generated according to at least one of the connected security hosts The security event signal dynamically sets the encoding parameters of the stored image signal. The security system of claim 9, wherein each security host is connected to a control center through a gateway system.