KR19990013024A - Automatic switching of recording mode of VSI with surveillance camera - Google Patents

Abstract

The present invention relates to a method of automatically switching a recording mode of a VSI having a surveillance camera, wherein an abnormal object is detected by the surveillance camera by checking a camera input signal while recording a signal input from the surveillance camera in a double speed or triple speed travel mode. When the VSI mode of recording is automatically switched to the standard mode, the part where the abnormal object is detected is clearly recorded to obtain a clear playback screen.

To this end, when the power is turned on, the present invention selects several fields among the 525 horizontal field scan lines, stores them as a luminance standard signal, and records a signal input from the current surveillance camera in a low speed mode, A first step of determining whether an abnormal object is detected by checking whether there is an abnormality; A second step of checking whether the current input signal is equal to the standard signal while performing recording by switching to the standard mode when an abnormality is detected in the current input signal as a result of the determination in the first step; In the second step, if the current input signal is the same as the standard signal, a third step of switching to the low speed mode to perform recording is performed.

Description

Automatic switching of recording mode of VSI with surveillance camera

The present invention relates to a VSI system configured to automatically record a signal input from a surveillance camera. More particularly, the present invention relates to a surveillance camera by automatically controlling a recording mode of a VSI based on a camera input signal. When the abnormal object such as an external intruder is detected, the recording mode of VSI with the monitoring camera automatically switches to the standard speed mode so that the recorded screen can be clearly reproduced during playback. It is about.

In general, an unmanned security system configured to connect a surveillance camera to a VSI to record a signal input from the camera is installed in an area where an outsider is expected to invade, and receives an external image signal and converts it into an electrical signal. A controller configured to be connected in parallel through a switch and having a plurality of surveillance cameras, the controller controlling the operation of the surveillance camera and communicating with a VSI system to record an image signal input from the camera; And a set of visual signals which receive an image signal in accordance with a control operation of the controller and operate a mechanism to record the image signal on a tape.

In addition, the monitor includes a monitor capable of outputting image signals captured by the surveillance cameras through the screen.

In the conventional security system as described above, first, a plurality of surveillance cameras are installed in various parts of each part where an outsider is expected to invade, and each of them is connected in parallel to the switch, and the controller can communicate with the VSI set to transmit and receive data. When the cameras are operated according to the control operation of the controller, the image signals captured by each camera are recorded on the tape in the VSI set or output to the outside through the monitor.

Therefore, when the security system starts to operate under the control of the controller, the image signal received by the camera and converted into an electrical signal is transmitted to the VSI set and the monitor through the controller, so the VSI set sets the deck mechanism at low speed (2x speed). Driving mode or 3x speed driving mode) to record the image signals being transmitted on the tape, and the monitor can output the image signals recorded in the V-real set on the screen.

However, in the security system of the conventional configuration as described above, when recording with the VSI set in the area where the unmanned surveillance camera is generally installed, it is necessary to continuously record for a long time, so the tape consumption increases, so the speed mode of the recording VSI Was selected as the 2x driving mode or 3x driving mode, the recording speed of the 2x driving mode and 3x driving mode is relatively lower than the standard speed mode, so that the playback screen cannot be clearly seen during playback. In addition, the VSI system used in such a security system is used as an accessory device which is implemented only as a time lapse function using only the recording function, thereby reducing the efficiency of the expensive VSI set. .

Therefore, the present invention was created to solve the above problems, the present invention is to automatically record the recording mode of the VSI in accordance with the camera input signal during recording in the VSI system configured to record the signal input from the surveillance camera When the camera detects an abnormal object in the camera while reducing the tape consumption by recording in the low speed mode (2x speed mode or 3 speed mode) when there is no change in the camera input signal, it switches to the standard speed mode. It is an object of the present invention to provide a recording mode automatic switching method of a VSI with a surveillance camera that allows a user to watch a clear screen during playback.

In order to achieve the above object, the present invention selects several fields from 525 horizontal field scan lines, stores them as a luminance standard signal, records current signals input from a surveillance camera in a low speed mode, and references the standard signals. A first step of determining whether an abnormal object is detected by checking whether or not the current input signal is abnormal; A second step of checking whether the current input signal is equal to the standard signal while performing recording by switching to the standard mode when an abnormality is detected in the current input signal as a result of the determination in the first step; In the second step, when the current input signal is equal to the standard signal, a recording mode automatic switching method of VSI having a surveillance camera comprising a third step of switching to a low speed mode to perform recording is provided.

1 is a block diagram showing a schematic configuration of a VSI recording system for carrying out the present invention.

2 is an operation flowchart for explaining a recording mode automatic switching method of VSI with a surveillance camera according to an embodiment of the present invention.

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

10: camera 20: delay unit

30: memory 40: first comparator

50: second comparison unit 60: control unit

70: recording driver 81: video signal processing unit

82: OSD processing unit

Hereinafter, a recording mode automatic switching method of a VSI with a surveillance camera according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a schematic configuration of a VSI recording system for carrying out the present invention, which is installed at a portion where an outsider is expected to invade as shown in the drawing, and receives an external image signal and converts it into an electrical signal. A plurality of surveillance cameras (10), a video signal processor (81) and a recording driver (70) for signal processing of image signals input from the camera and recording them on a tape or outputting them to a monitor, and an OSD processor for generating OSD characters It contains (82).

A delay unit 20 for delaying the image signal input from the camera for a predetermined time, a memory unit 30 for selecting several fields from 525 horizontal field scan lines of the image signal and storing them as luminance standard signals; A first comparator 40 and a second comparator 50 for detecting a movement of an object by comparing the image signal currently input based on the standard signal of the memory unit or the image signal delayed by a predetermined time, and the second comparator; The controller 60 detects an abnormal state of the image input signal by checking the output of the comparator, and controls the video signal processor and the recording driver to automatically switch the recording mode to the low speed mode or the standard mode to perform recording. It is included.

FIG. 2 is a flowchart illustrating a method of automatically switching a recording mode of a VSI with a surveillance camera according to an embodiment of the present invention. In the recording mode, a reference signal stored in advance while recording a signal input from the camera is stored in reference to a standard signal. First steps (S101-S105) of detecting an abnormal state of the current input signal, second steps (S106, S108) of switching to a standard mode to perform recording when an abnormality is detected in the current input signal, and a current input signal. If an abnormal object disappears, it can be divided into a third step (S109) of switching back to a low speed mode to perform recording.

That is, as shown in the drawing, the first step includes comparing a signal input from the current surveillance camera with a luminance standard signal stored by selecting several fields among 525 horizontal field scan lines (S101), and comparing the two signals with each other. If different, it is checked whether the recording mode is set (S102), and checking the signal delayed by a predetermined time and comparing the current input signal with the previous signal (S103, S104).

In this case, the first step may include a step (S105) of immediately outputting a message on the OSD screen for guiding the tape insertion if an error is detected in the current input signal when the recording mode is not set.

The second step is performed when an abnormality is detected in the current input signal in the recording mode as a result of the determination of the first step. The step of switching the recording speed to the standard mode to perform recording (S106) and proceeding with the standard recording. While checking whether the current input signal is the same as the standard signal, step S108 is performed.

The third step is a step performed when the current input signal is equal to the standard signal in the second step, and the step is performed again by switching the speed to the low speed mode (S109).

The operation of the present invention as described above is as follows.

First of all, the present invention reads a video signal of a surveillance area when it is normal, selects several fields among 525 horizontal field scan lines of a signal input from a surveillance camera, and stores the luminance standard signal stored as a standard signal and captures the current signal. A signal obtained by delaying the signal by a few frames is set as a delay signal.

Therefore, as shown in FIG. 2, when the standard signal is compared with the current signal (S101) and the signals are the same (N branch of S101), the signal continues to the current mode, and when the two signals are different (Y branch of S101), the recording mode. Check whether or not (S102).

If the recording mode is not set (N branch of S102), the current signal and the delayed signal are compared (S104). If the same, the current mode is continued. If the recording mode is different, the OSD processing unit controls the message to insert the recording tape. Display (S105) on the OSD screen and exit.

If the recording mode is set (Y branch in S102), the controller checks again whether the delay signal is equal to the signal captured by the current camera (S103). If the previous signal is the same as the current signal (N branch in S103), the current mode is set. Proceed with recording and end.

On the contrary, if the previous signal is different from the current signal (Y branch of S103), the low speed mode (2x speed driving mode or 3x speed driving mode) is automatically switched to the standard mode to record (S106), and the recording operation in the standard mode is performed. Is continuously executed until the current signal is equal to the standard signal, and when the current input signal is equal to the standard signal (N branch of S108), recording is performed again in the low speed mode (S109).

According to the present invention as described above, in the VSI system configured to record the signal input from the surveillance camera automatically control the recording mode according to the camera input signal to automatically detect the standard camera mode when an abnormal object is detected By switching over and recording, it is possible to reproduce a clear picture and make the most of the security effect.

Claims (1)

When the power is turned on, select several fields among the 525 horizontal field scan lines and store them as luminance standard signals, and record the signals input from the current surveillance camera in low speed mode and check whether there is any abnormality in the current input signals based on the standard signals. A first step of determining whether an abnormal object is detected; A second step of checking whether the current input signal is equal to the standard signal while performing recording by switching to the standard mode when an abnormality is detected in the current input signal as a result of the determination in the first step; And the recording mode automatic switching method of the VSI with the surveillance camera, which comprises the third step of switching to the low speed mode to perform recording when the current input signal is equal to the standard signal in the second step.