KR100393408B1 - System for monitoring and recording multi division image - Google Patents

Abstract

The present invention relates to a multi-segment video surveillance recording system that separates a function of displaying on a screen and a function of compressing and storing on a screen to display more frames per unit time and to record simultaneously. of

Select one channel among multi-channel video signal according to user's selection for capture card to display multi-channel video signal output from surveillance camera by dividing screen by 2 channels or more and display multi-channel video output from multiple surveillance camera An overlay card for outputting directly to the video memory of the PC system or reconstructing a multi-channel image into a split screen and outputting the video data directly to the video memory of the PC system, and directly outputting image data from the overlay card to the video memory. Displayed in real time on a multi-screen or individual screen, and at the same time, the image data transmitted from the capture card is received by the microprocessor and compressed, and then the compressed data is stored in the auxiliary memory device, if necessary, in the auxiliary memory device. Read image data A PC system that can be restored and displayed on a monitor, a PCI bus that connects the PC system with a capture card and an overlay card to transmit and receive video data and control signals, and a sensor input of various functions separately from monitoring and recording video. It includes an input / output card that accepts a warning and outputs a warning or alarm for a specific situation.

Description

Multi-Video Surveillance Recording System {SYSTEM FOR MONITORING AND RECORDING MULTI DIVISION IMAGE}

The present invention relates to a video surveillance system. More particularly, when a screen of one display device is divided into two or more screens and configured to simultaneously monitor a plurality of images, a multi-segment video surveillance recording system capable of displaying and recording images without signal loss. It is about.

In general, the most commonly used as a surveillance system for monitoring the occurrence of abnormal phenomenon such as theft or intrusion accident at a specific location is a video surveillance system using a camera and a monitor.

Such a video surveillance system has a structure in which a CCTV camera is installed at a specific location-a location where a specific object or a specific location can be photographed, and a subject is captured by the camera to display a screen captured by a monitor. A monitoring means is provided, and a supervisor is always arranged to determine whether there is an abnormality through the screen displayed on the monitor and take necessary measures.

Recently, a multi-segmentation video surveillance system has been introduced in which screens captured from several cameras, that is, screens of a plurality of channels, are divided into one screen and displayed on one screen.

1 is a block diagram showing a conventional four-segment video surveillance system, in which an imaging unit 10 including four cameras 11 to 14 provided at different locations and a camera 11 to 14 of the imaging unit 10 are shown. Monitors connected to the four splitters 15 in parallel with the four splitters 15, which display images captured by the four cameras 11 to 14, and display the divided images. And a recorder 17 for storing the photographed image.

In the 4-split video surveillance system of FIG. 1, the four cameras 11 to 14 of the image capturing unit 10 capture different monitoring targets and output video signals to the 4-spliter 15. Accordingly, the four splitter 15 edits and edits a plurality of video signals coming from each camera of the image capturing unit 10 so as to be displayed on one screen, and displays the edited four-segment video signals on the monitor 16 and the recorder 17. ) The monitor 16 displays a 4-split video signal output from the 4-split 15 on one screen. At the same time, the recorder 17 records the 4-split video signal input from the 4-splitter 15 as it is.

However, in the above-described four-segment video surveillance system, since the video signals input from a plurality of cameras are compressed and stored in the four-segment splitter 15 and displayed on the screen at the same time, a lot of problems arise in terms of speed. That is, while performing the compression algorithm in the four-splitter 15, the display on the monitor 16 cannot be performed. On the contrary, when the display is displayed on the monitor 16, the compression cannot be performed. The maximum number of frames that can be compressed per second is limited.

In addition, there is a drawback that the user can not support even if the user requires audio along with the video.

To solve this problem, it is possible to improve the speed in case of using the hardware chip without using the software, but on the other hand, it is expensive in terms of cost and it is difficult to change the algorithm according to the application.

The present invention has been proposed to solve the above-mentioned conventional problems, and the object thereof is to display more frames per unit time than the conventional method by separating a function of displaying a captured image on a screen in real time from a function of compressing and storing the same. It is to provide a multi-segment video surveillance recording system that enables simultaneous and simultaneous recording.

1 is a block diagram illustrating a conventional multi-segmentation video surveillance recording system.

2 is a block diagram showing the overall configuration of a multi-segment video surveillance recording system according to the present invention.

3 is a block diagram of an overlay card in the multi-segment video surveillance recording system according to the present invention.

4 is a block diagram of a capture card in the multi-stage video surveillance recording system according to the present invention.

5 is a block diagram of an input / output card in the multi-segment video surveillance recording system according to the present invention.

* Description of the symbols for the main parts of the drawings *

21: PC system

22: capture card

23: overlay card

24: I / O Card

25: ISA bus

26: PCI bus

The present invention as a technical means for achieving the above object, the multi-segment video surveillance recording system

A capture card for converting and outputting a multi-channel video signal output from a plurality of surveillance cameras into a storage form;

In order to display the multi-channel video output from multiple surveillance cameras, one of the multi-channel video signals is selected according to the user's selection and output directly to the video memory of the PC system, or the multi-channel video is reconfigured into a split screen. An overlay card that directly outputs the video memory;

Directly output image data from the overlay card to the video memory and display the image data in real time on a monitor or in separate screens. At the same time, the image data transmitted from the capture card is received by the microprocessor and compressed. A PC system for storing the data in the auxiliary memory device, and if necessary, read the data from the auxiliary memory device and restore the image data to display on the monitor;

PCI bus, which transmits and receives video data and control signals by connecting the PC system with the capture card and the overlay card, and receives sensor inputs of various functions separately from monitoring and recording of video to output warnings or alarms for a specific situation. Configured by including input / output card.

The system according to the present invention configured as described above basically has a DMA embedded in the PCI controller so that image data input from a plurality of cameras can be written directly to the video memory of the PC system through an overlay card and reproduced in real time on the screen. It uses a controller to transfer directly to memory, and simultaneously compresses the image data input to the microprocessor of the PC system from the capture card regardless of the screen display. In some cases, one channel is combined with audio data and frame unit. It is stored in the auxiliary memory. The data thus stored is restored to the original data by the microprocessor's restoration software and displayed on the screen as required by the user.

That is, up to 16 channels of images can be displayed on one screen in real time using the DMA technique, while at the same time, the microprocessor of the PC system compresses and stores the images acquired through the PCI bus from the camera. Many frames are displayed on the screen and can be stored in auxiliary memory.

In addition, since audio information can be stored in a frame unit with video for one channel and can be restored when necessary, the audio information can be supported when the user wants audio information at the same time.

Hereinafter, the configuration and operation of the multi-stage video surveillance recording system according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a block diagram showing the overall configuration of a multi-segmentation video surveillance recording system according to the present invention, a PC system for compressing and storing the image data transmitted at the same time while displaying a large-sized video in a multi-segment screen or independent screen ( 21), a capture card 22 that collects and converts the multi-channel video signals output from the plurality of surveillance cameras into a form that can be stored and outputs them to the PC system 21, and the multi-channel video outputs from the multiple surveillance cameras. An overlay card that selects one channel among the multi-channel video signals for display and outputs it to the video memory of the PC system 21 or reconstructs the multi-channel video into the divided screen and outputs the video to the video memory of the PC system 21. 23) and outputs a warning or alarm by judging occurrence of an abnormal situation by receiving output signals of a plurality of monitoring sensors. An I / O card 24 for generating a control signal for adjusting the pan / tilt parameters of the controller; an ISA bus 25 connected to the PC system 21 and the I / O card 22 for transmitting and receiving data; And a PCI bus 26 connected between the PC system 21, the capture card 22, and the overlay card 23 to transmit and receive data.

In the above, the multi-segment video surveillance and recording system according to the present invention receives images captured by a plurality of surveillance cameras, respectively, by the capture card 22 and the overlay card 23, and the images collected by the capture card 22. While compressing and storing the image data, the image data input through the overlay card 23 is displayed on the monitor in real time.

The operation and configuration of each of the above construction means will be described in more detail.

3 is a block diagram showing an embodiment of the overlay card 23 in the surveillance recording system according to the present invention. The video multiplexer receives a multi-channel video signal and outputs only a video signal of a selected channel. 31) and a plurality of decoders 32 for reducing the image size in inverse proportion to a set screen division by receiving the multi-channel video signals, respectively, and the plurality of channels resized by the plurality of decoders 32, respectively. A plurality of field memories (33) for storing video data, a screen reconstructing unit (34) for importing video data stored in the plurality of field memories (33), and reconstructing them into a single-screen video signal divided therein; An encoder 35 for converting image data input from the multiplexer 31 or the screen reconstructor 34 into an analog video signal, and an output analog video signal input from the encoder 35. It consists of a PCI interface unit 36 that outputs to the PCI bus.

The above embodiment is a surveillance recording system for processing video signals of 16 channels, wherein the number of the plurality of decoders 32 and the field memory 33 is equal to 16 as the number of channels.

The overlay card 23 configured as described above receives 16 channel analog image data captured by a plurality of CCTV cameras, and outputs one channel selected by a user in real time, or displays a plurality of channels on one screen. Synthesizes so as to appear on the PCI bus 26 to transmit to the PC system 21.

In the illustrated embodiment, 16 channels are maximized, but the number of channels can be easily expanded by adding hardware and a little software work from the configuration of the present invention. .

Image data of a plurality of channels output from a plurality of CCTV cameras are respectively input to a plurality of video decoders 32 in the overlay card 23 and simultaneously to a video multiplexer 31.

The plurality of video decoders 32 decode video signals of corresponding channels, respectively, into video sizes according to a set number of divisions. For example, if 16 channels of data are to be simultaneously reproduced on one screen, the image size of each channel is decoded to be 1/16 of the entire display screen.

Image data decoded by the plurality of video decoders 35 is input to and stored in a corresponding field memory among the plurality of field memories 33, and image data of a plurality of channels stored in the plurality of field memories 33. Read sequentially from the screen reconstruction unit 34 to configure a multi-screen.

More specifically, the screen reconstructor 34 sequentially stores the contents of the plurality of field memories 33 according to the division order using the control signal applied from the encoder 35 to form one screen.

The split screen configured by the screen reconstructing unit 34 is output to the encoder 35, and the encoder 35 converts the input data into an analog video (composite) signal and outputs the same to the PCI interface unit 34.

In addition, the PCI interface unit 36 receives a video signal of one selected channel output from the video multiplexer 31.

Accordingly, the PCI interface 36 selects a signal input from the video multiplexer 31 and transmits it to a desired destination (i.e., PC system 21) when the surveillance screen setting is a full screen. If the setting is a split screen, a signal input from the encoder 35 is selected and output to the PCI bus 26 to be transmitted to the destination (i.e., the PC system 21).

More specifically, when the entire screen is to be displayed, the video multiplexer 31 selects and outputs only data of a channel selected by the user from among multiple channels (16 channels). The data output from the video multiplexer 31 is input to the PCI interface unit 36 and finally transmitted directly to the video memory of the PC system 21 via the PCI bus 26. The data thus transferred is written directly to the video memory of the PC system 21 and reproduced on a monitor in real time.

To this end, a direct transmission to the video memory of the PC system 21 using a DMA controller built into the PCI interface 36 is taken.

In addition, the capture card 22 shown in FIG. 2 is a part of collecting image data of each channel in order to record a multi-channel image, and shows a detailed configuration of the capture card 22 in FIG.

As shown in FIG. 4, the capture card 22 includes a plurality of decoders 41 and a plurality of decoders 41, each of which receives data of two channels by time division and decodes them into a digital image having a set size. Reads a plurality of field memories 42 storing the two channel image data decoded by the multi-channel image data stored in the plurality of field memories 42 and records two channel images on one screen. The screen reconstruction unit 43 for adjusting the address of the image data, the microcontroller 44 for controlling the respective devices, and the image data output from the screen reconstruction unit 43 through the PCI bus 26. It consists of a PCI interface unit 46 for transmission to (21).

The capture card 22 configured as described above receives up to 16 channels of camera image data through the plurality of video decoders 41. Unlike the overlay card 23 described above, two captures of the video decoder 41 are performed. The video data is time-divided and each channel data is digitally converted and the video size is appropriately reduced and stored in the corresponding field memory 42. Therefore, the number of decoders 41 and field memories 42 in the capture card 22 is half the number of decoders 32 and field memories 33 of the overlay card 23. That is, the capture card 22 includes eight decoders 41 and field memories 42.

The image data output from the capture card 22 to the PCI bus 26 is transmitted to the PC system 21 and then compressed and stored by the microprocessor in the PC system 21 using MJPEG or H.263 techniques. do.

Therefore, the image data output from the capture card 22 is compressed by the microprocessor of the PC system 21 and stored in the auxiliary memory device, and then restored by the microprocessor's restoration software to be reproduced on the monitor when desired.

At this time, the PC system 21 compresses the image before storing the image data input from the capture card 22, which detects the screen change of the previous frame and the current frame, and the information of the current frame when the screen change is small. Transmit only the current frame transmission existence discrimination bit without sending a separate signal. If the screen change of the current frame and the previous frame is more than a certain level, the difference between the two frames is compressed and transmitted.

At this time, the compression method is applied by selecting the DCT, VQ, wavelet, etc. according to the application area.

The detection of the screen change during the compression process stores the data of the previous screen as the average value by the arithmetic mean and compares it with the average value by the arithmetic mean of the new data, and judges from the difference, or each block of the previous frame and the current frame. Calculate the least square error in units, use it to determine the screen change, or use computer vision or artificial intelligence to store the objects in the database, and compare them with each other using the screen change when the boundary of the object changes. You can use the method of recognizing it.

In addition, the I / O card 24 receives sensor inputs of various functions separately from monitoring and recording images, and outputs a warning or alarm for a specific situation. The detailed configuration is shown in FIG. 5.

In FIG. 5, the I / 0 card 24 is a multi-channel digital I / O 51 to which an output signal of a sensor installed at a location where CCTV is photographed and monitors a predetermined state is input, and the multi-channel digital I / O 51 The microcontroller 52 checks and judges the state of each sensor through the control unit, and adjusts the pan / tilt of the camera according to the external control signal. The microcontroller 52 receives an external control signal through the ISA bus 25. Input / output processing unit (53) to be applied to, asynchronous transmitter / receiver (54) for outputting a pan / tilt adjustment signal of the camera under the control of the microcontroller (52), and a control signal outputted from the asynchronous receiver (54). The converter 55 outputs a signal recognizable by the camera and transmits the signal to the camera.

The sensor data processed by the I / O card 24 generates a warning or alarm according to a specific movement or heat detection by, for example, an infrared sensor or a temperature sensor.

The I / O card 24 receives the sensor input data digitally from the microcontroller 52 through the 16-channel digital I / O 51 so as to check a specific situation, and the control signal is Accept via the CPLD 53. In addition, the microcontroller 52 receives the sensor input data, and outputs the output data to the digital I / O 51 again for a specific situation, so that a warning broadcast or an alarm can be sounded.

On the other hand, the PC system 21 for controlling the pan / tilt value of the surveillance camera sends a control signal through the ISA bus 25, which is input to the RS232 / RS422 converter 55 via the UART (54). The RS232 / RS422 converter 55 converts computer format data into a form that can be recognized by the camera, and the converter output data finally controls the pan / tilt parameter of the camera.

As described above, according to the multi-stage video surveillance recording system according to the present invention, the function of real-time display on the monitor and the function of compressing and storing in the memory are separately processed to display more frames per unit time than the conventional method, and There is an excellent effect that enables recording. In addition to the video information, the user can save and process the audio information.In addition, when the image is compressed, the difference is changed for the corresponding frame when there is no change by using the difference image in the unit of frame. Since only the presence information is stored, more bits can be compressed, which is an excellent effect.

Claims (9)

A capture card which collects the multi-channel video signals output from the plurality of surveillance cameras and converts them into a storage form; In order to display the multi-channel video output from multiple surveillance cameras, one of the multi-channel video signals is selected according to the user's selection and output directly to the video memory of the PC system, or the multi-channel video is reconfigured into a split screen. An overlay card that directly outputs the video memory; Directly output image data from the overlay card to the video memory and display in real time on a monitor in multiple screens or on separate screens. At the same time, the image data transmitted from the capture card is received by a microprocessor and compressed. A PC system for storing the data in the auxiliary memory device, and if necessary, read the data from the auxiliary memory device and restore the image data to display on the monitor; And It receives an output signal of a plurality of monitoring sensors to determine the occurrence of an abnormal situation outputs a warning or alarm, and comprises an I / O card for generating a control signal for adjusting the pan / tilt parameters of the plurality of surveillance cameras Multi-segment video surveillance recording system. The method of claim 1, The overlay card includes a video multiplexer which receives a video signal of multiple channels and selects and outputs only one video signal of one channel; A plurality of decoders each receiving the multi-channel video signals and reducing an image size in inverse proportion to a set screen division; A plurality of field memories connected corresponding to the plurality of decoders to store image data of each decoded channel; A screen reconstructing unit for reconstructing a multi-part image by loading image data stored in the plurality of field memories; An encoder for converting image data output from the video multiplexer or the screen reconstruction unit into an analog image signal; And And a PCI interface unit for outputting the output analog video signal output from the encoder to the PCI bus. The method of claim 1, The capture card comprises: a plurality of decoders which receive video data of two channels in time division and decode them into digital images having a set size; A plurality of field memories respectively connected to the plurality of decoders and storing two decoded image data; A screen reconstructing unit configured to read image data of multiple channels stored in the plurality of field memories and adjust an address of the image data so that two channels of images are recorded on one screen; A microcontroller for controlling the operation of each device; And And a PCI interface unit for transmitting the image data output from the screen reconstructing unit to the PC system through the PCI bus. The method of claim 3, wherein The PC system detects the screen change of the previous frame and the current frame. If the screen change is small, the PC system transmits only the current frame transmission presence discrimination bit without sending the information of the current frame separately to increase the compression ratio. A multi-segmented video surveillance recording system, characterized by compressing and sending difference video of two frames when there is some change. The multi-segment video surveillance recording system according to claim 4, wherein the compression scheme selects and applies DCT, VQ, wavelet, etc. according to an application area. The method of claim 4, wherein the PC system stores the average value of the data of the previous screen by the arithmetic mean and compares it with the average value of the arithmetic mean of the data which is input again. Multi-segment video surveillance recording system. The multi-segmented video surveillance recording system according to claim 4, wherein the PC system calculates a least square error in units of blocks of two frames and detects a screen change by using the least square error. The method of claim 4, wherein the PC system stores the objects in a database using computer vision or artificial intelligence, and compares the objects to each other using the computer vision, and recognizes that there is a screen change when the boundary of the object changes. Multi Video Surveillance Recording System. The video surveillance recording system of claim 1, wherein A PCI bus that connects the PC system with a capture card and an overlay card to transmit and receive image data and control signals; And an ISA bus connected to the PC system and the I / O card to transmit and receive data.