JP3060713U - Surveillance camera system - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In a surveillance camera system, even when serious alarm information such as disconnection of a cable to which a video signal is sent from a camera, power supply of a camera is cut off, and input of a video signal is cut off. , So that the alarm information is properly displayed on the screen. SOLUTION: When a synchronizing signal is lost due to generation of serious alarm information such as disconnection of cables 4a to 4d for transmitting video signals of cameras 2a to 2d, synchronizing signal detecting and generating means 10 detects the synchronizing signal. To generate a synchronizing signal and supply it for on-screen display instead of the video signal from the camera. Thereby, the alarm detection sensors 3a to 3a
The alarm information signal detected by 3d can be displayed on the monitor 14 on the screen.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a surveillance camera system that receives a video signal from a surveillance camera and alarm information detected by an alarm detection unit and displays the information on a screen of a monitor device.

[0002]

[Prior art]

 Conventionally, in a surveillance camera system, a plurality of surveillance cameras and a monitor device are connected by a cable, and output signals from the surveillance cameras are sequentially switched and supplied to the monitor device, so that an image is displayed on a monitor screen. Are displayed in a time-division manner (see, for example, Japanese Patent Application Laid-Open No. 62-265879). Also, the synchronization signal generated by the synchronization signal generator is modulated on the center side where the monitoring device is located without connecting cables between the multiple monitoring cameras and the synchronization signal generator individually. It is necessary to equip each camera terminal with a synchronization signal generator so that each camera terminal can be synchronized by demodulating its synchronization signal. A lost device is known (for example, see Japanese Patent Application Laid-Open No. 9-9100).

[0003]

[Problems to be solved by the invention]

 However, in the above devices, if the cable from which the video signal is sent from the camera is cut or the power of the camera is cut off, the surveillance function will be lost. In the system configuration that displays on-screen the alarm information detected by the alarm detection means on the screen of the monitor device in addition to the image by the camera, the alarm information Cannot be displayed on-screen. Therefore, when the video signal of one camera (for example, channel 1) is lost even though the individual surveillance cameras and the alarm detection means are originally associated with each other, the image of channel 2 different from that is lost. It is conceivable to display on-screen alarm information on the display screen, but this is uncomfortable.

[0004] The present invention has been made to solve the above-described problems, and the cable for transmitting the video signal from the camera is cut off, or the power supply of the camera is cut off, and the video signal is disconnected. It is an object of the present invention to provide a surveillance camera system that can appropriately display on-screen alarm information even when such serious alarm information is generated.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, a first aspect of the present invention is a surveillance camera system which receives a video signal from a surveillance camera and a signal from an alarm detection means and displays video and alarm information on a screen of a monitor device. A synchronization signal detecting means for checking whether or not there is a synchronization signal in a video signal transmitted from the camera to the monitor device via the cable; and a detection result obtained by the synchronization signal detection means. Synchronizing signal detection and generation means for generating and supplying this for on-screen display instead of a video signal from a camera; alarm information detection means for detecting an alarm information signal detected by the alarm detection means; An on-screen display means for displaying on-screen the alarm information detected by the alarm information detecting means on a monitor device. It is.

In the above configuration, when the synchronizing signal is lost due to the occurrence of serious alarm information such as the disconnection of the cable for transmitting the video signal of the camera, the synchronizing signal detecting and generating means detects the synchronizing signal and detects the synchronizing signal. A signal is generated and supplied for on-screen display instead of the video signal from the camera. As a result, since the synchronization signal does not disappear, the alarm information signal detected by the alarm detection means can be displayed on-screen on the screen of the monitor device.

According to a second aspect of the present invention, in the surveillance camera system according to the first aspect, the video signal from the camera and the signal from the alarm detecting means are transmitted by a common cable. In this configuration, the configuration is simplified with the shared cable, and in the event of a serious alarm information occurrence as described above, the alarm information signal can be reliably displayed on the screen of the monitor device.

A third aspect of the present invention is the surveillance camera system according to the first or second aspect, wherein a plurality of cameras are provided, and each of the images supplied from the plurality of cameras to the monitor device. It is provided with signal switching means for sequentially switching signals. In this configuration, a monitoring system can be constructed with a relatively simple structure by performing time-division display or screen-division display with a plurality of cameras and one monitor device.

[0009]

[Embodiment of the invention]

 Hereinafter, a surveillance camera system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a block configuration of the monitoring camera system. This surveillance camera system 1 is composed of a terminal side device, a center side device, and a monitor device. The terminal side has surveillance cameras 2a to 2d and alarm detection sensors 3a to 3d (alarm detection means). Are connected by cables 4a to 4d that individually transmit video signals from the cameras 2a to 2d and cables 5a to 5d that transmit signals from the alarm detection sensors 3a to 3d. The equipment on the center side includes a CPU 7 that controls the entire system, a memory 8, a changeover switch 9, a synchronization signal detection and generation means 10, an alarm information detection circuit 11, an on-screen display circuit 12, and an on-screen display circuit 12. Means), a camera changeover switch 13 and a monitor 14 (monitor device).

Each of the monitoring cameras 2 a to 2 d is installed at a monitoring place desired by the user, and each of the alarm detection sensors 3 a to 3 d is arranged corresponding to each of the monitoring cameras 2 a to 2 d. As the alarm detection sensors 3a to 3d, an infrared sensor for detecting a suspicious person, a window open sensor, a call button of an intercom, and a means for detecting a disconnection of a cable can be applied. The synchronization signal detection and generation means 10 checks through the detection line 6 whether or not there is a synchronization signal in the video signal transmitted to the monitor 14 via the cables 4a to 4d. A signal is generated and output to the CPU 7 so that the signal can be supplied to the on-screen display circuit 12 instead of the video signal from the camera. The alarm information detection circuit 11 detects an alarm information signal input from the alarm detection sensors 3a to 3d via the cables 5a to 5d, and outputs the detected alarm information to the CPU 7 for on-screen display on the monitor 14. . The CPU 7 controls the synchronizing signal detection and generation means 10, the on-screen display circuit 12, and the camera changeover switch 13. By switching the switch 13, the video from each camera is displayed in a time-division manner on the monitor 14 in a normal state. Is divided and displayed, for example, the camera channel number is displayed by the on-screen display function.

Next, the operation of the monitoring camera system 1 configured as described above will be described. Normally, video signals from the cameras 2a to 2d are transmitted to the center via the cables 4a to 4d, switched by the camera changeover switch 13 according to an instruction from the CPU 7, and displayed on the monitor 14. The on-screen display circuit 12 displays a channel number corresponding to the camera displayed on the monitor 14. Now, when the alarm information is detected by the alarm detection sensors 3a to 3d, the CPU 7 switches the camera changeover switch 13 to the corresponding channel, and the on-screen display circuit 12 displays the alarm information in characters or the like.

However, in the case of an alarm such as a cable disconnection or a camera power cut-off, a video signal is not input, and thus a synchronization signal is lost. Therefore, even if the alarm information is displayed in characters on the on-screen display, the characters flow on the screen and cannot be displayed correctly. In the present embodiment, the synchronization signal detection and generation means 10 detects a synchronization signal for each camera, and when the synchronization signal is lost, generates a synchronization signal and substitutes the video signal from the camera for on-screen. It is given to the display circuit 12. Thus, the alarm information can be correctly displayed on the monitor 14 on the screen.

FIG. 2 shows a block diagram of a surveillance camera system according to another embodiment of the present invention. In this embodiment, the cables 5a to 5d for transmitting signals from the alarm detection sensors 3a to 3d are omitted, and the cables 4a to 4d of the cameras 2a to 2d are shared for transmitting the signals. Both signals are superimposed and transmitted. By thus sharing the cables 4a to 4d, it is possible to reliably detect a serious alarm such as a cable disconnection, and to simplify the structure and reduce the cost.

The present invention is not limited to the configuration of the embodiment described above, and various modifications are possible. For example, a television receiver may be used instead of the monitor 14. Although the number of cameras is four in the embodiment, any number may be used.

[0015]

[Effect of the invention]

 As described above, according to the invention of claim 1, when a synchronization signal is lost due to generation of serious alarm information such as a disconnection of a cable for transmitting a video signal of a camera or a shutdown of a power supply of a camera. Detects and generates a synchronization signal and supplies it to the on-screen display instead of the video signal from the camera, so the alarm information signal detected by the alarm detection means can be properly displayed on the monitor screen. Can be displayed on-screen. Further, according to the invention of claim 2, since the video signal from the camera and the signal from the alarm detection means are transmitted by the common cable, the configuration is simplified, and In the event of a serious alarm information occurrence, the alarm information signal can be reliably displayed on the screen. According to the invention of claim 3, since each video signal supplied to the monitor device from a plurality of cameras is sequentially switched, time-division display or split display of the screen is performed, which is relatively simple. A monitoring system can be constructed with a simple structure.

[Brief description of the drawings]

FIG. 1 is a block diagram of a surveillance camera system according to an embodiment of the present invention.

FIG. 2 is a block diagram of a surveillance camera system according to another embodiment of the present invention.

[Explanation of symbols]

2a to 2d Surveillance camera 3a to 3d Alarm detection sensor (alarm detection means) 4a to 4d cable 5a to 5d cable 10 Synchronization signal detection and generation means 11 Alarm information detection circuit 12 On-screen display circuit (On-screen display means) 14 Monitor ( Monitor device)

Claims (3)

[Utility model registration claims] 1. A surveillance camera system which receives a video signal from a surveillance camera and a signal from an alarm detection means and displays a video and alarm information on a screen of a monitor device. A synchronization signal detecting means for checking whether or not there is a synchronization signal in the video signal to be transmitted; and a detection result by the synchronization signal detection means. When there is no synchronization signal, a synchronization signal is generated. A synchronization signal detecting and generating means for supplying an on-screen display instead of an alarm information detecting means for detecting an alarm information signal detected by the alarm detecting means; and an alarm information detected by the alarm information detecting means. A surveillance camera system comprising on-screen display means for on-screen display on a monitor device. 2. The surveillance camera system according to claim 1, wherein the video signal from the camera and the signal from the alarm detection means are transmitted by a common cable. 3. The apparatus according to claim 1, wherein a plurality of cameras are provided, and signal switching means for sequentially switching each video signal supplied from the plurality of cameras to the monitor device is provided. The surveillance camera system as described.