JP2011071920A - Remote video monitoring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To transfer an abnormal portion in a video to another person so as to easily discriminate the portion. <P>SOLUTION: A monitor camera apparatus, in which a video captured by a camera is video-encoded by an encoder and outputted, and a lookout facility, in which the encoded video is inputted, decoded and reproduced on a display device, are connected communicably over an IP network. The lookout facility includes an input means (mouse, touch panel) for receiving a handwriting operation from a guardian, and a handwriting data transmitting means (personal computer terminal 22, management server 21) for converting data of the received handwriting operation into plotting data and transmitting them to the encoder with a predetermined protocol. The monitor camera apparatus includes the encoder for combining a plotting video signal, which is generated by processing the plotting data from the handwriting data transmitting means, with a signal of the inputted video and then video-encoding the combined signal. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a remote video monitoring system, and more particularly to a remote video monitoring system that distributes video according to an operation of an operator.

  2. Description of the Related Art Conventionally, CCTV (Closed Circuit TeleVsion) systems are known that encode video captured by a surveillance camera and transmit it to a surveillance center or the like via an IP network (see, for example, Patent Documents 1 to 3).

  Public buildings such as roads and rivers are examples of monitoring targets. In such monitoring, when an abnormality occurs due to a disaster or the like, it is conceivable to observe the situation by watching a video, check the site as necessary, and take measures such as restoration work, traffic regulation, and evacuation. In the monitoring center, when a sign of abnormality such as a crack or water leakage is found from the video, the video is distributed to related persons and patrol personnel.

  If only video without a situation description is distributed, it may not be possible to fully grasp the situation, and it would be convenient to be able to display a composite image with character information that is convenient for monitoring for video handlers.

  Patent Document 1 discloses a camera system that acquires camera image data in a surveillance area, a camera system that includes an encoder that generates encoded image data obtained by encoding the camera image data, and a video that transmits impose character string data. A management server, a decoder for synthesizing the impose character string data with the encoded image data to generate composite image data, a decoder for decoding the composite image data to generate decoded image data, and the decoded image data There is disclosed a video monitoring system including a video monitoring terminal having a display device that receives and displays a camera image including the imposed character string on a screen.

  In Patent Document 2, a plurality of monitoring devices having a camera and a character signal generation unit superimpose alarm characters corresponding to a monitoring code received from the outside via a network on the video of the camera, and connect the network to the video collection and delivery device. A monitoring system is disclosed for transmitting over the network.

  In addition, as a technique related to the present invention, there is known a wireless control monitor device capable of operating a monitor display by a wireless remote controller (see, for example, Patent Document 4).

JP 2007-67974 A JP 2005-136557 A JP 2004-96197 A JP 2002-112247 A

Even if there are signs of anomalies in the video, it may not be easy to know where the anomalies are in the video, except for experienced observers. However, in the monitoring systems of Patent Documents 1 and 2, characters can be superimposed on the monitoring video, and handwritten input graphics and the like cannot be displayed. Therefore, there is a problem that it cannot be used to indicate an abnormal part in the video. there were.
Even if characters are superimposed on the video, characters must be input from a keyboard or the like that is rarely used even in a surveillance center, and if a mobile communication terminal or the like that does not have a keyboard is taken into account, it is agile. There was a problem that input was difficult.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a remote video monitoring system that transmits an abnormal part in a video so that it can be easily understood by a person concerned.

  The remote video surveillance system of this invention.

  According to the present invention, an input operation of an arbitrary graphic or the like by a supervisor is accepted, and the arbitrary graphic or the like is superimposed on the video distribution source and then encoded, so that an abnormal portion in the video can be easily processed. Can point to other video viewers.

Configuration diagram of monitoring system 1 (Examples 1 and 2) Functional block diagram of the encoder 13 (first and second embodiments) The flowchart which shows a flow until the drawing data input-inputted with the personal computer terminal 22 etc. are superimposed on the surveillance camera image | video by the encoder 13 (Example 1, 2). External view of wireless remote control 26 (Example 1) Example of screen display of mobile communication terminal 40 in a state where a Java application is activated (Example 2)

  Hereinafter, embodiments of a remote video monitoring system of the present invention will be described with reference to the drawings.

  FIG. 1 is a configuration diagram of a monitoring system 1 according to the first embodiment.

The monitoring system 1 is constructed by a plurality of monitoring camera devices 10 and a monitoring station 20 where monitoring personnel monitor. Each of the monitoring camera devices 10 and the monitoring station 20 are connected by an IP network 30.
The surveillance camera device 10 includes a camera platform camera 11, a camera platform camera controller 12, an encoder 13, and a transmission device 14.

  The pan head camera 11 is a surveillance video camera integrated with an electric pan head, and outputs the captured image to the pan head camera controller 12 as an analog signal. Further, in accordance with a pan head control signal from the pan head camera controller 12, pan head tilt and zoom are driven to set the imaging range (each image) in a desired direction and magnification.

  The pan / tilt camera controller 12 is connected to the pan / tilt camera 11 with a dedicated cable, and the analog video signal from the pan / tilt camera controller 12 is converted into a standard analog video signal and output to the encoder. In addition, according to the control command packet received via the transmission device 14, the pan head control command and the camera control command are output to the pan head camera 11, and responses to these commands are received from the pan head camera 11 and responded to the control source. Send out as a packet. The camera control command is used to set AGC (automatic gain control), white balance, automatic electronic shutter, etc., and to self-check the camera.

  The encoder 13 includes an analog video input terminal and a network interface. The encoder 13 converts an analog signal of a video captured by the monitoring camera 11 into video encoded data in response to a video request from the monitoring station 20, and outputs the IP packet as an IP packet. It is a device and is also called a video IP server or the like. In addition to transmitting live video (moving images) using RTSP or the like, it also has a function of transmitting still images using HTTP or the like. The present embodiment is characterized in that video coding is performed after overlaying image data received from the monitoring station 20 is overlaid on video captured by the monitoring camera 11.

  The transmission device 14 is a device that connects the camera platform camera controller 12 and the encoder 13 to the IP network 30 to perform IP communication. The transmission device 14 is a hub device, a network switch (L2 / L3), a router, Ethernet (trademark)- An SDH (Synchronous Digital Hierarchy) converter or the like is appropriately used.

  Next, the monitoring station 20 will be described. The monitoring station 20 is provided with a management server 21, a personal computer terminal 22, a decoder 23, a large display device 24, a wireless operation relay device 25, a wireless remote controller 26, a transmission device 27, and a router 28. Has been.

The management server 21 is a server that manages the entire monitoring system, and receives signals from the personal computer terminal 22 and the wireless remote control 26 by the monitoring personnel and signals for inquiring operation rights, and alarm signals from the monitoring camera device 10. In response to this, the surveillance camera device 10 and the decoder 23 are controlled, the operation right information and the information necessary for receiving the video are notified to the requesting personal computer terminal 22 and the like, and a rotating lamp (not shown) is provided. It can be activated to trigger a report. For control communication with the monitoring camera device 10, the personal computer terminal 22, and the decoder, for example, ONVIF (Open Network Video Interface Forum Core Specification Version 1.0).
November 2008), and a simpler protocol can be used for communication with the wireless remote controller 26 (wireless operation relay device 25).
Moreover, you may have a mail server function and a web server function for delivering the image | video (a still image is also included) to a portable communication terminal (not shown).

The personal computer terminal 22 is a terminal used by an observer, has a software decoding function, and requests a video request directly or via the management server 21 to the camera platform camera controller 12 or the encoder 13 of any of a plurality of surveillance camera devices 10. The images are received periodically or cyclically and displayed in a list (tile display) so that they can be selected, one selected image is displayed in full screen, or the pan head is operated. Further, the encoder 13 or the decoder 23 is accessed directly or via the management server 21, and the decoder 23 performs an operation such as an instruction of a video to be received. A plurality of personal computer terminals 22 can be provided, but only one specific terminal can change the display output of the decoder.
As a feature of the present embodiment, the personal computer terminal 22 further draws an arbitrary line on the displayed video by operating a pointer displayed on the screen with a mouse or the like, and data of the drawn line (raster Alternatively, vector image data) is compressed and transmitted to the encoder.

  The decoder 23 receives and decodes the encoded video data transmitted from the plurality of surveillance camera devices 10, combines these images in a tile shape, and outputs them to the large display device 24 by a general-purpose interface such as an RGB signal. This is an HD compatible video decoding device. The decoder 23 may request the encoder 13 to receive the video instructed to the personal computer terminal 22 or may simply decode the video sent to its own IP address.

The large display device 24 can display a high-resolution image of 1920 × 1080 pixels.
The wireless operation relay device 25 is a ZigBee-IP gateway, and performs address conversion, protocol conversion, and the like so that communication can be performed between a wireless network standardized as IEEE802.15.4 and an IP network. If necessary, the IP address of the management server 21 or the like as a communication partner on the IP network is stored.

The wireless remote controller 26 has a part of the operation functions that can be performed by the personal computer terminal 22, and selects a monitoring camera device 10 to be operated by pressing a button, and operates a pan head, zoom, focus, and the like.
For example, the wireless remote controller 26 converts the control command (ONVIF SOAP message) in the same form as that used by the personal computer terminal 22 into an IP packet (the header may be incomplete) and sends it to the wireless network. The operation command becomes a complete IP packet by the network layer gateway function of the wireless operation relay device 25 and is transmitted to the encoder 13 and the decoder 23. Alternatively, an Application Object corresponding to an operation command (or each button of the wireless remote control 26) used by the personal computer terminal 22 in the wireless remote control 26 or the like is defined, and the wireless remote control 26 uses this Object to send a message when the button is pressed. And the application of the wireless operation relay device 25 converts this message into an operation command, and sends the URI associated with the message (Object) to the IP network as a destination. The operation command converted at this time may be the same as that used by the personal computer terminal 22 as long as it can be interpreted by the management server 21 and may be a simpler key code of several bytes.

The transmission device 27 is the same device as the transmission device 14 and connects the monitoring station LAN 29 to the IP network 30.
The router 28 connects the monitoring station LAN 29 to the Internet, a cellular phone packet network, or the like.

FIG. 2 is a functional block diagram of the encoder 13. Actually, blocks other than the reference numerals 31, 32, 40, 44, and 45 are realized by software execution means such as a DSP. Each block requires a temporary memory or a non-volatile memory, but the illustration is omitted.
An AFE (Analog Front-End) 31 inputs a composite video signal or the like, performs A / D conversion, Y-C separation by a comb filter or notch filter, chroma processing, and the like.
The deinterlace unit 32 converts the interlaced video input from the AFE 31 into a progressive video.

The video processing unit 33 performs digital signal processing on the video signal input from the deinterlacing unit 32, such as knee correction, shake correction, super-resolution processing, digital zoom (partial cutout), etc. that have a visual dynamic range expansion function. Performs various video conversions.
An OSD (On Screen Display) unit 34 synthesizes (superimposes) a drawing video signal generated based on the drawing data sent from the monitoring station 20 with the video signal input from the video processing unit 33 and outputs the resultant signal. To do.

The video encoding unit 35 converts the video signal input from the OSD unit 34 into JPEG, MPEG4, H.264. H.264 or the like is used to output encoded video data. Parameters such as an encoding method and a frame rate are given from the control unit 42 (described later).
The memory 36 is a ring buffer that always stores a predetermined amount of encoded video data from the present, and is stored until it is overwritten with the latest video after being read by the RTP processing unit. Used to cope with communication speed fluctuations.

  The RTP processing unit 37 sequentially reads the encoded video data from the memory 36 to form an RTP packet, and outputs the packet to the tunnel processing unit 38 (described later). An RTCP sender report and reception report are transmitted to and received from the monitoring station 20 via the tunnel processing unit 38 to control the rate of RTP packetization. The packetization size is adjusted to 1500 bytes or less in consideration of the subsequent encapsulation (tunneling processing) overhead. In response to an instruction from the control unit 42, the RTP processing unit 37 fixes the rate or outputs the encoded video data read without being converted into RTP packets.

  The tunnel processing unit 38 has RTSP and HTTP protocol functions, and in accordance with the provisions of RFC2326 “10.12 Embedded (Interleaved) Binary Data”, each RTP packet or RTCP packet is a simple header starting with a “$” character. Add and encapsulate. When only RTSP tunneling is used, this data is output to the L2-l3 processing unit 39 (described later) by designating the RTSP port number. When performing HTTP tunneling, the HTTP port number is specified and sent to the L2-l3 processing unit 39 as an http message encapsulated in a raw or encapsulated RTP (RTCP) packet with an HTTP header. To do. On the contrary, when receiving, the opposite process is performed.

The L2-L3 processing unit 39 provides socket communication, and data input from the tunnel processing unit 38 or the like is packetized by TCP or UDP, and further converted into an IP packet to be converted into a LAN.
In addition to being output to the I / F 40 (described later), the IP packet received from the LAN I / F 40 is processed in the reverse manner, distributed to each bound connection, and output to the tunnel processing unit 38 and the like.
The LAN I / F 40 performs MAC layer and physical layer processing according to the IP network 30.

The HTTP processing unit 41 has an HTTP (and HTTPS) server function, and provides a web page for transmitting a metafile necessary for starting an RTSP session and performing various settings of the encoder 13. The HTTP processing unit 41 accepts a setting change by the cgi parameter and data transmission (OSD drawing data) by the POST method from the personal computer terminal 22 of the monitoring station 20 and passes them to the control unit 42. For example, the personal computer terminal 22 transmits an HTTP request message having a header starting with the following two lines.
GET cgi-bin / ctrl.cgi? (Setting item name) = (Setting value)
Host: www. ******. Ne.jp
The HTTP processing unit 41 also decapsulates the camera platform control command and the camera control command received by HTTP tunneling and passes them to the protocol conversion unit 43 (described later). The camera platform control command received from the protocol conversion unit 43, etc. The reverse process is performed for (not used in this embodiment).

The control unit 42 is a part that controls the operation of the entire encoder 13, and outputs various settings and data received by the HTTP processing unit 41 to the video encoding unit 35, the OSD unit 33, and the like to reflect the settings.
The protocol conversion unit 43 converts the pan head control command and the camera control command so as to match the command system of the connected pan head camera.

The RS-485 I / F 44 provides a physical interface for bidirectionally communicating a command or the like converted by the protocol conversion unit 43 with a pan head camera or the like.
The contact I / O 45 inputs signals such as a human sensor provided in the vicinity of the pan head camera 11 and an emergency button, and outputs ON / OFF control signals such as a wiper and a defroster of the pan head camera or an alarm buzzer. Is a general-purpose contact input / output circuit, and is controlled by the control unit 42. The protocol conversion unit 43 and the RS-485 I / F 44 are the same as those provided in the pan / tilt camera controller 12, and are not particularly used in this example.

The voice encoding unit 46 outputs voice encoded data obtained by encoding a voice signal input from a microphone or the like provided near the camera platform 11 by a method such as ADPCM.
The memory 47 is a ring buffer similar to the memory 36.
Note that in the tunnel processing unit 38, RTP packets of video encoded data and audio encoded data may be combined into one connection or session.

  The voice decoding unit 48 decodes an RTP packet or the like transmitted from the personal computer terminal 22 or the like and received via the RTP processing unit 37, converts it into an analog voice signal, and outputs it. This audio output is connected to a speaker or the like provided near the pan head camera 11.

FIG. 3 is a flowchart showing a flow until drawing data input by the personal computer terminal 22 or the like is superimposed on the surveillance camera video by the encoder 13.
In step S101, the personal computer terminal 22 receives an input from a pointing device such as a mouse or a tablet. This is realized by the OS or device driver, and this flow is started by this input event. For example, if the OS is Windows XP of Microsoft Corporation in the United States, button controls for drawing input instructions such as a free curve, an arrow, a rectangular frame, and a character are provided in a window displayed on the screen.

  In step S102, the personal computer terminal 22 determines whether or not the input accepted in step S101 is a drawing input. For example, by using the API provided by User32.dll etc., whether or not the coordinates of the mouse have changed with the left mouse button pressed after the press message from the button control of the free curve (that is, the latest After receiving the processed coordinates, it is determined whether or not the current coordinates are received without pinching the event that the left button of the mouse is released. Alternatively, after a press message from the arrow (rectangular) button control, it is determined whether the left button of the mouse has been pressed and then moved to a different coordinate to release the left button. If it is determined that the input is not a drawing input, the processing of this flow ends.

  In step S <b> 103, the personal computer terminal 22 displays a locus for the drawing input on the screen according to the drawing input. For example, a GDI object is created and drawn using an API function that draws a straight line connecting the latest processed coordinates and the current coordinates. In addition to drawing input using a mouse or the like, characters, figures, or the like automatically generated from numerical values acquired by a telemeter or the like may be displayed superimposed on the video in the same manner as drawing input.

  In step S104, the personal computer terminal 22 appropriately converts the data format of the drawing input (including automatically generated characters / graphics) or the drawing result data, and uses it as drawing data as the encoder of the monitoring camera device 10 that is the transmission source of the video. 13 to send. As the data format, LZH that specifies coordinates of two points (vector data) in the same manner as the straight line drawn in S103, or a bitmap that can be acquired from a GDI object (all drawing inputs to be displayed are reflected) The one compressed in the format can be used. Information such as line color and thickness may also be included. These drawing data are enclosed in an HTTP POST or PUT message, or given as cgi parameters such as a GET message, and transmitted to the URI of the encoder 13.

  In step S105, the current coordinates input by drawing are stored as the most recently processed coordinates.

  In step S106, the HTTP processing unit 41 of the encoder 13 receives the HTTP message transmitted from the personal computer terminal 22 in S105, and passes the drawing data to the control unit 41 or stores it in a temporary memory (not shown). A response message to the reception is returned. If the line color, thickness, etc. are not specified in the received drawing data, the default values are applied. When drawing data without these designations is transmitted from a plurality of different personal computer terminals 22 and received by the HTTP processing unit 41, the default value of the personal computer terminal 22 that received the drawing data later is changed to the drawing data first. The default value of the received personal computer terminal 22 is automatically set differently.

In step S <b> 107, the control unit 41 processes the drawing data received in S <b> 105 and writes it in the video memory (bit map for one frame) of the OSD unit 33. The writing timing is immediately before the frame that the video encoding unit 35 encodes with an I picture (IDR picture). When the pan / tilt or zoom of the pan / tilt head is driven, the entire video memory is erased (automatically generated characters / graphics are not limited to this).
The OSD unit 33 may change the color table of the drawing data written in the video memory in an integer multiple cycle in synchronization with the I picture. Thereby, the visibility can be improved by blinking the drawing data.

  FIG. 4 is an external view of the wireless remote controller 26. The wireless remote control 26 has a box-shaped outer shape. On the upper surface serving as an operation surface, a power button 51, a multi-screen display button 52, a pair of video selection buttons 53, an INITIAL button 54, a WIPER button 55, It has a LIGHT button 56, a pair of FOCUS buttons 57, a pair of ZOOM buttons 58, a pan head control cross key 59, a PRESET button group 60 corresponding to 0 to 9, and an LED 61. Moreover, the revealing means 62 (not shown) is incorporated. Assuming that the display of the large display device 24 or the like to be viewed in large numbers is directly operated, the guidance is not displayed on the screen, and the operation is directly reflected by pressing the buttons once. Yes.

  The power button 51 is a button for turning on / off the power of the wireless remote controller 26. The LED 61 lights for a certain time when the power button 51 and all other buttons are pressed when the power is turned on.

Each time the multi-screen display button 52 is pressed, the screen display mode is switched between single-screen display and multi-screen display.
The video selection button 53 is to forward or reverse the monitoring camera device 10 to be displayed one by one in a predetermined order one by one during a one-screen display, and during a multi-screen display, This is for selecting one of the images. The latter selection operation is reflected on the screen by displaying the selected image with a frame for a certain period of time.

  The INITIAL button 54 is for returning the screen display to the initial state. For example, when the button is pressed briefly, an image in a predetermined preset of the predetermined monitoring camera device 10 is displayed, and when the button is pressed long, A reset signal is sent to the encoder 13, the decoder 23, the pan head camera controller 12, and the pan head camera 11, and then the wireless remote control 26 itself is also reset to cancel all previous operations and display the same display as above. Note that a preset defines at least the pan, tilt, and zoom positions of the camera platform so that the same image can be taken at any time, and can also include settings such as white balance, backlight correction, and resolution.

The FOCUS button 57 and the ZOOM button 58 are displayed when one screen is displayed, and when the multi-screen display is selected, the selected camera image and the focus of the camera platform camera 11 of the surveillance camera device 10 that captured the selected video are displayed. It is for operating the zoom.
The pan / tilt head control cross key 59 is preferably a biaxial position sensor, and gives the pan / tilt driving speed of the pan / tilt camera 11 in accordance with the pressing amount in the horizontal and vertical directions.

  The PRESET button group 60 is associated with a plurality of preset numbers preset in the monitoring camera device 10 being displayed during one screen display, and when pressed, the pan head camera faces the preset. It is. During multi-screen display, a plurality of multi-screen assignment settings are associated with each other, and display is performed with the assignment settings when pressed. The multi-screen assignment setting is setting information that defines a set of four surveillance camera devices 10 and their presets, for example, in the case of four screens.

  The revealing means 62 is a buzzer or a vibrator, and a sensor signal or the like input from the contact I / O 45 of the encoder 13 or the like is transmitted to the wireless remote controller 26 via the management server 21 or the wireless operation relay device 25. It rings when there is no operation right from the management server 21 or when an error response is returned for the operation performed from the wireless remote controller 26.

  According to the present embodiment, the surveillance video in which a free curve, an arrow, a rectangular frame, characters, etc. are written by the operation on the personal computer terminal 22 is distributed from the surveillance camera device 10, so that the same surveillance video is sent to other viewers. Can be easily provided.

  The monitoring system according to the second embodiment is different from the first embodiment in that handwritten input to a video can be performed from a mobile communication terminal or the like.

  The mobile communication terminal 40 of this example is a general mobile phone, PDA or the like having an execution environment of J2ME (Java 2 Micro Edition, java is a trademark), and can communicate with the monitoring system 1 via the router 28. ing. In addition, the display screen has a resistive film type or electrostatic type touch panel so that handwriting can be input with a fingertip, a stylus pen, or the like. First, a Java application (MIDLet) for video browsing and handwriting input is downloaded and installed from the management server 21 to the mobile communication terminal 40. At that time, the URI or the like of the management server 21 is automatically saved as the communication connection destination setting of the Java application.

  FIG. 5 is a screen display example in a state where a Java application is activated and a video from the management server 21 is displayed. If you set the address of the management server 21 from the “menu” at the bottom left of the screen, you will automatically receive any video (videos or still images) delivered from the management server 21 after the Java application is started. And display.

For example, in the case of i-mode (trademark), an input from the touch panel can be received by the “com.docomostar.opt.ui.TouchDevice” class in the same manner as a key.
When the “handwriting” button in FIG. 4 is pressed, the Java application receives input from the touch panel, displays the locus at the coordinates of the screen according to the input, and vectorizes all touch panel input except redundant input. Accumulate with data. When the “arrow” button is pressed, it is the same as “handwriting” except that only the touched coordinates and the released coordinates are handled as a pair.
When the “Return” button is pressed, the latest accumulated vector data is deleted in a predetermined unit, and the locus is redisplayed with the deleted accumulated vector data so that the entry operation can be returned.
When the “send result mail” button is pressed, the stored vector data and the text entered by pressing the “character” button are sent to the management server 21 by the HTTP POST method or e-mail.
In the lower right area of the video, an input text when the “character” button is pressed, a map showing the installation position and shooting direction of the surveillance camera, and the like are displayed.

When receiving the vector data from the mobile communication terminal 40, the management server 21 transmits it to the encoder 13 by the same protocol as that transmitted from the personal computer terminal 22 in the first embodiment.
In the first embodiment, handwritten input is sequentially transmitted from the personal computer terminal 22 to the encoder 13 (in real time). 13 is reflected.

1 surveillance system, 10 surveillance camera device,
20 monitoring stations, 30 IP networks,
11 pan head camera, 12 pan head camera controller,
13 Encoder, 14 Transmission device,
21 management server, 22 PC terminal,
23 Decoder, 24 Large display device,
25 wireless operation relay device, 26 wireless remote control,
27 transmission equipment, 28 routers,
29 Monitoring LAN.

Claims (1)

A surveillance camera device that encodes video captured by a camera with an encoder and outputs the video to an IP network, and a monitoring station facility that decodes the video encoded video received via the IP network and reproduces it on a display device In a remote video surveillance system comprising
The monitoring station equipment is
An input means for accepting a handwriting operation from a monitor;
Handwritten data transmitting means for converting the accepted handwriting operation data into drawing data and transmitting to the encoder with a predetermined protocol;
The surveillance camera device
An encoder for synthesizing a drawing video signal generated by processing the drawing data from the handwritten data transmission means and encoding the synthesized signal with the input video signal. Remote video surveillance system.