KR20010026249A - Digital Video Surveillance System - Google Patents

Abstract

PURPOSE: A digital image monitoring system is provided to display a plurality of motion image division screens on a single screen by transmitting in parallel images of all the cameras to a screen division unit and synchronizing image outputs of all the cameras. CONSTITUTION: A digital image monitoring system includes a plurality of monitoring cameras(25). A video image input unit receives video image of the plurality of monitoring cameras. A video distributor distributes the inputted video images. A screen division unit(24b) divides the screen in plurality. A video image compressing unit(24c) compresses the inputted video images. A video image storage stores the video images. An image output unit(21) outputs a VGA signal or a NTSC signal. The video images of the plurality of monitoring cameras are transmitted in parallel to the screen division unit via the video image input unit and the video distributor. A synchronizing generation controller is provided between the video image input unit and the screen division unit and synchronizes the plurality of images transmitted in parallel to output synchronized images. A select logic is responsible for an interface with a user and recognizes the number of divided screen and information on a selected camera ID. A field multiplexer determines a screen region to be displayed by information on the divided number of the select logic. A signal controller transmits an image corresponding on a camera to the multiplexer depending on the ID information of the selected camera of the select logic.

Description

Digital video surveillance system {Digital Video Surveillance System}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital video surveillance system, and more particularly, to a digital video surveillance system in which all divided screens are provided as moving images when the video signals of a plurality of cameras are divided and displayed on one screen.

The unmanned security system is mainly used as a control method that operates by connecting the security equipment and the automation equipment installed in large multi-family houses or high-rise buildings, and is used to detect intruders who intrude into the home or building accidentally or to detect a fire early. It is a system that can be monitored through a monitor displayed at a remote place after connecting a fire detection sensor to a computer in an entrance, a window or an area where a fire is likely to occur, or an area where a fire can be easily detected.

Early unmanned security systems applied analog methods to capture and record the output of unmanned cameras by VCR or Time Lapse VCR. However, the analogue unmanned security system has a problem in that it is impossible to quickly search, output or transmit multiple recordings or recorded images, and also that the quality of the recorded images is deteriorated, so that the recorded objects cannot be accurately analyzed.

In general, the unmanned security system has a plurality of sensors attached to the surveillance camera to generate an alarm signal, and has a function of recording the video of the camera when the alarm signal is generated from the sensor. However, in the conventional unmanned security system, when the alarm signal is generated from a sensor attached to another camera during the process of recording the video of the camera that generated the alarm signal, it is impossible to completely record the video of all the surveillance cameras that generated the alarm signal. There was a problem of degrading the performance of the system.

1 shows an alarm processing method of a conventional unmanned security system. In Fig. 1 (a), the numbers in the circle indicate the order in which the alarms occurred, and the alarm occurrence time is shown on the numbers in the circle. 1 (b-1) to (d) show a recording state of the camera, a thick solid line indicates a state in which recording is in progress, and a thin solid line shows a period during which recording is not in progress. The numbers in the boxes 1 through 8 represent the alarm device 28. The unmanned security system responding to each alarm signal may record the video of the camera for a predetermined time to check the cause of the alarm by reviewing future recorded video. For convenience of explanation, it is assumed that each alarm is connected to a separate camera, and when an alarm occurs, the camera automatically records for 30 seconds.

As shown in FIG. 1A, when the second alarm device generates an alarm signal, recording of the state of the second camera associated with the second alarm device starts. If another alarm signal does not occur for 30 seconds after the second camera starts recording, the state of the second camera is recorded for 30 seconds and then automatically stops recording. However, when the fourth alarm device generates an alarm signal 30 seconds after the second camera starts recording as shown in FIG. 1 (b), the conventional system has handled this matter in two ways.

The first processing method is shown in FIG. 1 (b), FIG. 1 (b-1) shows the recording state of the second camera, and FIG. 1 (b-2) shows the recording state of the fourth camera. As shown in FIG. 1B, the first processing method is a method of stopping recording of the second camera and starting recording of the fourth camera. However, when using this method, there is a problem in that it is impossible to record an important moment of the second camera.

The second processing method is adopted by the ASL company, which is shown in FIG. 1 (c), FIG. 1 (c-1) shows the recording state of the second camera, and FIG. 1 (c-2) shows the fourth camera's recording state. Indicates the recording status. As shown in (c) of FIG. 1, while crossing the second camera and the fourth camera from the time point t2 at which the fourth alarm signal is generated to the time when recording of the second camera ends (t1 + 30 seconds) 1 Recording is done every second. That is, the fourth camera records only from (t2 to t2 + 1), (t2 + 2 to t2 + 3), ...., (t1 + 28 to t1 + 29) for the period t2 to (t1 + 30 seconds). It will go on and wait for the rest of the time. However, in the conventional system, since the image switching is performed by software, when the camera is crossed every second like the second processing method, the time required for the camera image switching every time is increased, so the second camera is actually recorded for 1 second. After that, about one second is consumed for camera switching, and then the fourth camera is recorded for one second.

In order to clarify the problem of the system which processes the alarm generation by the time division, the second processing method described above, the first alarm is generated when 10 alarm signals are generated at the same time (first camera to the tenth camera) in FIG. The recording status of the generated camera is shown. In FIG. 1 (d), the time required for switching for convenience of description will be described without consideration. In FIG. 1D, the thick solid line indicates an interval at which the state of the camera is recorded, and the thin solid line indicates that the camera is waiting for recording of the other nine cameras. As shown in FIG. 1 (d), when 10 alarms occur, the state of the camera is 30 seconds (t1 to t1 + 1), (t1 + 10 to t1 + 11), and (t1 + 20 to t1 +). It can be seen that only 3 seconds of recording is performed and the remaining time is spent waiting. Therefore, in the conventional video surveillance system, video recording by a plurality of alarm signals is applied in a time division manner, thereby causing a problem of loss of video data.

In addition, even in the conventional video surveillance system, it is possible to display divided screens such as 4 divisions / 8 divisions, but there is a problem in that all the divided images cannot be video. An example of a conventional method of displaying a quad screen of FIG. 2 will be described below.

In FIG. 2, each number represents an identification number of each surveillance camera. In the conventional video surveillance system when a split screen is displayed as shown in FIG. 2, a) a method of providing only one screen of the divided four screens as a video, that is, only the first camera video is continued as a video and the remaining video is still. Or a method of continuously providing only one camera image as a moving image at regular time intervals. That is, during the first 1 second, the first camera image is provided as a moving image, the second, third and fourth camera images as a still image, and at the next moment, the second image is a moving image, and the first, third and fourth images are still. As a method of providing a video, a method of sequentially changing a camera provided in a video. Therefore, in the conventional video surveillance system displaying the split screen, there is a problem in that all the split screens cannot be provided as moving images at the same time.

In the conventional video surveillance system, there has been a video surveillance system that simultaneously outputs the same video signal as an NTSC signal and a VGA signal. However, in such a system, the output of NTSC signal and VGA signal is processed by processing one image source signal, so that the same image is always provided to NTSC signal and VGA signal.

3 shows a video output signal of a conventional video surveillance system. As shown in (a) of FIG. 3, the NTSC signal output from the imaging system is divided into four divided screens composed of first, second, third and fourth camera images, one divided screen composed of fifth camera images, and a first one. When outputted in the order of 8 split screens consisting of the second, ..., and eighth camera images, the VGA output signal also displays the same image as shown in FIG. There was a constraint that the signal and NTSC signal were always the same.

The present invention has been made to solve the above problems, and even if a plurality of alarm signals occur at the same time by having a frame switcher composed of hardware can process information without loss, and can provide a plurality of split screens as a video The purpose of the present invention is to provide a digital video surveillance system.

In addition, an object of the present invention is to provide a dual tasking video signal for outputting a video signal different from the output VGA signal and the NTSC signal.

1 is a schematic diagram showing an alarm processing method of a conventional video surveillance system.

2 is a schematic diagram illustrating a split screen display method of a conventional video surveillance system.

3 is an explanatory diagram showing a NTSC output signal and a VGA output signal reproduction method of a conventional video surveillance system.

4 is a block diagram of a digital video surveillance system of the present invention.

5 is a partial view of the present system including a screen splitter applied in the digital video surveillance system of the present invention.

Fig. 6 is a partial block diagram of a dual task digital video surveillance system according to another embodiment of the present invention having two screen splitters 24b.

7 is an explanatory diagram showing an NTSC output signal and a VGA output signal reproduction method of the dual task digital video surveillance system of the present invention.

8 is an explanatory diagram illustrating processing of a plurality of alarm signals.

******* Description of the main signs in the drawings *******

21: video output unit 22: display

24: video image integrated processing unit 24a: frame switcher

24b: split screen unit 24c: video compression unit

25: surveillance camera 27: the alarm processing unit

27a: Digital I / O 27b: Alarm Processing Logic

28: sensor

An object of the present invention described above is to compress a plurality of surveillance cameras, a video image input unit for receiving video images of a plurality of surveillance cameras, a video splitter for distributing video image inputs, a screen splitter for dividing a screen into a plurality, and a video image input. A digital video surveillance system including a video image compression unit configured to communicate with the outside, a video processing unit configured to communicate with an external device, a video image storage unit configured to store a video image, and an image image output unit configured to output at least one of a VGA signal and an NTSC signal To

Video images of a plurality of surveillance cameras are transmitted in parallel to the screen splitter through the video image input unit and the video distributor,

A synchronization signal generation controller which is provided between a video image input unit and the screen splitter, and which outputs a synchronized image to the screen splitter by synchronizing a plurality of images transmitted in parallel with the video image input unit,

Split screen donation

A selection logic that functions to interface with a user and recognizes information about the number of split screens and a selection camera identification number;

A field multiplexer for determining a screen area to be displayed by information of the number of split screens of the selection logic; And

Selection of selection logic The digital video surveillance system is characterized in that each divided screen is provided as a video at the same time by providing a signal controller for transmitting the image of the camera to the multiplexer according to the identification number information of the camera.

In addition, an object of the present invention is to distribute an image image output unit for outputting at least one signal of a VGA signal or NTSC signal, a plurality of surveillance cameras, a video image input unit for receiving video images of the plurality of surveillance cameras, video image input A video splitter, a screen splitter for dividing a screen into a plurality, a video image compressor for compressing a video image input, a plurality of sensors connected to a plurality of surveillance cameras, and an alarm processor for processing signals generated from a plurality of sensors In the digital video surveillance system having an alarm device for outputting an alarm signal, a communication processing unit for enabling communication with the outside and a video image storage unit for storing a video image,

It has a frame switcher composed of hardware to facilitate the video switching,

Alarm processing unit

A digital input unit configured to receive signals generated from a plurality of sensors; And

And a digital output unit for outputting an output signal of the digital input unit to the alarm device, and recording a state of each of the plurality of surveillance cameras connected to the plurality of alarm signals in units of frames per unit time. Is achievable.

4 is a system block diagram of the present invention consisting of 16 surveillance cameras. The video output signal of the surveillance camera 25 is input to the video video integrated processing unit 24. The image integration processing section 24 is composed of a frame switcher section 24a, a screen divider section 24b, and an image compression section 24c. The frame switcher 24a directly connects an asynchronous signal input from the 16 surveillance cameras 25 to convert the input image into digital to keep the image free of shaking when switching the input image (25 frames / sec). It is responsible for synchronizing functions. The quadrature part 24b is responsible for outputting images of 16 cameras connected to the system to a single, four-, eight-, and 16-split screen. The image compression unit 24c has a function of converting an analog image input into digital, and compresses and restores it. In the present invention, the MJPEG, wave let and H.263 technology, which has been greatly improved to maintain high-speed digital conversion compression storage and high quality, has improved function reliability.

The image output unit 21 outputs the image signal processed by the video image integration processing unit 24 to the display device 22. The image output unit 21 of the present invention is composed of at least one of an overlay unit and / or a VGA unit 21a or an NTSC converter 21b to respectively convert a VGA signal or an NTSC signal into a general CPT (Color Picture Tube) or a CDT (Color Dot). It can be connected to one of the tubes.

Signals generated from various sensors 28 such as thermal sensors, fire detection sensors, door sensors, vibration sensors and the like are input to the alarm processing unit 27. The alarm processing unit is composed of a digital input unit 27a and a digital output unit 27b. The digital input unit 27a receives signals generated from various sensors 28 and then transmits the signals through the digital output unit 27b. If necessary, activate the alarm device 33, such as a flashing light / siren.

In addition, the digital video surveillance system of the present invention can process the video in a compressed data format, and store it in a file format in a data storage unit 31 such as a hard disk. Therefore, there is an advantage that the recorded video information can be easily classified and searched by various search conditions such as camera, day of the week or time zone.

The stored image data may be output through an output unit 29 such as a printer, or the stored image data may be moved to a long distance using the communication unit 26 of a LAN or WAN system, or various digital units may be used by the communication unit 26. By connecting a video surveillance system, it is possible to remotely control a digital video surveillance system installed in another area. The bus line / control line 30 and CPI 23 function similar to those in the conventional electronic control apparatus.

5 is a partial detailed view of the present system including the screen splitter 24b of the digital video surveillance system of the present invention. Through the screen splitter 24b of the present invention, it is possible to make a video of the whole divided screen.

Video signals from a plurality of cameras (16 in FIG. 5) are input to the video input unit 35 in a parallel manner. The output of the video input unit 35 synchronizes the output of the plurality of camera video signals by way of the synchronization signal generation controller 36, and then inputs the synchronized video output signals to the video distributor 37. The video distributor 37 is distributed to the frame switcher unit 24a, the screen divider unit 24b, and the image compression unit 24c, respectively.

In the conventional video surveillance system, a) video signal output from each camera is not synchronized, and b) video of all cameras is not transmitted in parallel to the screen splitter 24b, and the video of the camera to be viewed as a video. Since only a signal was selected and transmitted to the screen splitter 24b, all the split screens could not be provided as a moving picture at the same time. Therefore, in the present invention, the synchronization signal generation controller 36 is used to synchronize the synchronization of all camera image outputs, and the image signals of all the cameras are transmitted to the screen splitter 24b in a parallel manner so that a plurality of images are displayed on one screen. Even if the camera image is displayed, all the split screens can be provided as a video at the same time.

The simple synchronization signal generation controller 36 may be configured with an analog to digital converter (A / D) and a first-in first-out (FIFO) buffer. The synchronization signal generation controller 36 digitally converts each of the analog signals output from the plurality of cameras 25 and inputs them to the FIFO buffer. When inputting to the FIFO, images from a plurality of cameras are input as different synchronization signals. However, when the FIFO buffer is output, video is output by the same clock, so that video images of a plurality of cameras can be synchronized.

The selector logic 40 is a part in charge of the interface with the user. The selector logic 40 selects one of " full screen / 4 split screen / 8 split screen / 16 split screen " and selects a camera identification number to be displayed among multiple split screens. The selector logic 40 then passes the corresponding selection information to the signal controller 38 and the multiplexer 39. The multiplexer 39 is configured to display the space to be displayed in the video memory according to the user's selection of "full screen / 4 split screen / 8 split screen / 16 split screen" in response to each selection signal. 39b, an 8 division screen part 39c, and a 16 division screen part 39d. The signal controller 38 delivers the images of the associated cameras to the multiplexer according to the user's selection. That is, when the user selects a quad screen and selects cameras 1, 2, 4, and 6 to be displayed on the quad screen, the multiplexer 39 sets the video memory to display the quad screen. The signal controller 38 then displays an image of the camera in the desired area.

6 is a partial block diagram of a dual task digital video surveillance system, which is another embodiment of the present invention having two screen splitters 24B; The video distributor 37 output of the dual task digital video surveillance system is configured to be input to two split screen bases 24B and 24b. According to the configuration as shown in FIG. 6, since the two screen division bases can be operated independently of each other, the two screen division bases are different from each other through the selector logics 40A and 40B installed in the screen division bases 24B and 24B. Can be provided.

That is, as shown in FIG. 7A, the 24B split screen base includes: i) a four-split screen provided with the first, second, third, and fourth camera images; and ii) one-split provided with the fifth camera image. Screen and iii) when the 8-split screen including the first, second, ..., eighth camera images is displayed in order, as shown in FIG. One split screen provided with camera images ii) Four split screens provided with first, second, third and fourth camera images iii) Four split screens provided with fifth, sixth, seventh and eighth camera images Each screen can be displayed.

Preferably, the outputs of the screen splitters 24B and 24b are respectively displayed on the NTSC monitor 22 through the NTSC converter 21b or on the VGA monitor 22 through the overlay and / or VGA sections 21a. Can be.

8 illustrates a method of processing a plurality of alarm signals of the present invention. Reference numerals used in FIG. 8 are the same as in FIG. 1, and for convenience of description, each alarm is connected to a separate camera, and when an alarm occurs, the alarm is set to automatically record the corresponding camera for 30 seconds.

As shown in FIG. 8A, when the second alarm device generates an alarm signal at a time t1, the alarm processing method of the present invention starts to record the second camera image during the period (t1 to t1 + 30 seconds) (FIG. 8). b-1). (t1 + 30 seconds) If the fourth alarm device generates an alarm signal at the time t2 before the end of the time, the fourth camera recording starts (Fig. 8B-2). In order to achieve the object of the present invention for recording all the camera conditions that generated the alarm signal without exception, the second camera is recorded from the time t2 at which the fourth camera starts recording to the time at which recording of the second camera ends (t1 + 30 seconds). Both camera and fourth camera status should be recorded. Then, only the fourth camera state needs to be recorded from the time passing (t1 + 30 seconds) to (t2 + 30 seconds).

When divided into sections, as shown in FIG. 8B-3, only the first section recording only the second camera and only the second section and the fourth camera recording simultaneously of the second camera and the fourth camera proceed with recording. It can be divided into a third section. In the first section and the third section, the video recording of the camera is performed as shown by the solid lines in FIGS. 8 b-1 and b-2 only, and the states of the second camera and the fourth camera are displayed during the second section. Unlike the conventional time-division recording method in which recording is carried out alternately in units of time by applying a method of alternately recording one frame for each camera per second (hatched portions in FIGS. 8B-1 and b-2). You can clearly record the state of the camera. That is, in the conventional video surveillance system, since the frame switching part was processed by the software method, it took a lot of time to switch the video. However, the digital video surveillance system of the present invention includes a hardware frame switcher so that video switching can be performed at a fast time. As a result, video loss can be eliminated by enabling recording of each camera state by frame for a predetermined time.

Therefore, in the digital video surveillance system of the present invention, even if the alarm signal occurs in 10 places at the same time (first camera to the tenth camera), the recording is automatically progressed by one frame per second for each camera by the hardware frame switcher. Unlike the prior art described above, it is possible to record the state of all the cameras that triggered the alarm without losing information during the waiting time.

As described above, according to the digital video surveillance system of the present invention, the digital video compression technology is adopted to realize high-definition and high-definition video digitization, and the recorded video can be quickly searched, output or transmitted.

In addition, when displaying multiple camera statuses on one screen at the same time, each split screen is provided as a video, and at the same time, even if a plurality of alarms occur, the camera status that triggered the alarms is recorded in frame units so as to display image information. Was not lost.

In addition, it provided dual task digital video surveillance system that can control NTSC monitor output and VGA monitor output separately.

Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely exemplary and should be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. . Therefore, the true scope of protection of the present invention should be defined by the technical spirit of the appended claims.

Claims (5)

A plurality of surveillance cameras, a video image input unit for receiving the video images of the plurality of surveillance cameras, a video splitter for distributing the video image input, a screen splitter for dividing the screen into a plurality, video image compression for compressing the video image input A digital video surveillance system comprising: a video processing unit configured to enable communication with an external device; a video image storage unit storing a video image; and an image image output unit configured to output at least one of a VGA signal and an NTSC signal. Video images of the plurality of surveillance cameras are transmitted in parallel to the screen splitter through the video image input unit and the video distributor, A synchronization signal generation controller provided between the video image input unit and the screen divider unit to synchronize a plurality of images transmitted in parallel with the video image input unit to output a synchronized image to the screen divider unit, The screen splitter Selection logic which is in charge of an interface function with a user and recognizes information regarding the number of split screens and a selection camera identification number; A field multiplexer for determining a screen area to be displayed by information of the number of split screens of the selection logic; And And a signal controller for transmitting an image of the corresponding camera to the multiplexer according to the identification number information of the selection camera of the selection logic. The digital video surveillance system according to claim 1, further comprising two or more screen splitters. The apparatus according to claim 1 or 2, further comprising a frame switcher composed of hardware for quickly switching between video image frames, wherein the frame switcher, the screen splitter and the video image compressor are provided in one card. Digital video surveillance system, characterized in that. 4. The digital video surveillance system according to any one of claims 1 to 3, wherein said synchronization signal generation controller is comprised of an analog to digital (A / D) converter and a first-in first-out (FIFO). Image image output unit for outputting at least one signal of a VGA signal or NTSC signal, a plurality of surveillance cameras, a video image input unit for receiving video images of the plurality of surveillance cameras, a video splitter for distributing the video image input, screen A splitter for dividing the video into a plurality, a video image compression unit for compressing the video image input, a plurality of sensors connected and attached to the plurality of surveillance cameras, an alarm processing unit for processing signals generated from the plurality of sensors, and A digital video surveillance system comprising: an alarm device for outputting an alarm signal; a communication processing unit for enabling communication with the outside; and a video image storage unit for storing a video image. It has a frame switcher composed of hardware to facilitate the video switching, The alarm processing unit A digital input unit configured to receive signals generated from the plurality of sensors; And And a digital output unit for outputting the output signal of the digital input unit to the alarm device, and recording the state of each of the plurality of surveillance cameras connected to the plurality of alarm signals in units of frames per unit time.