KR20010065835A - Method for recording video signal before and after alarm - Google Patents

Abstract

PURPOSE: An image recording method around alarm of time lapse videotape recorder is provided to grasp condition or shape of a thing to watch and cause of an accident from a main image taken around generation of an emergency state by recording continuously not only an image after generation of an alarm signal but also an image before generation of the alarm signal on a recording medium. CONSTITUTION: A first process records continuously an inputted image signal on a recording medium for an established time. A second process progresses the recording medium in reverse direction as a section less than that recorded in the first process. A third process records continuously an image signal inputted from a present position with progressing the recording medium in front direction in case an emergency state generates during repeated performance of the first and the second process.

Description

Method for recording video signal before and after alarm in time-lapse video recorder

The present invention relates to a method for recording an image before and after an alarm of a time lapse video recording player. It relates to a video recording method before and after the alarm.

In general, the time-lapse video recording player records the video image transmitted from the external photographing device in real time, instead of recording the entire frame in real time. When a signal indicating an emergency condition is output from a security sensor that detects a set emergency condition (movement detection, door open detection, etc.), the time-lapse video recording / replaying device presets a predetermined image of a video input from the corresponding external recording device. By continuously recording on the recording medium in real time for a time, it is possible to reproduce the situation after the occurrence of an emergency afterwards to replace it after theft or disaster, and is mainly installed in major areas such as banks and museums.

FIG. 1 schematically shows a configuration of a conventional time-lapse video recording / reproducing apparatus. The switching unit 10 selectively outputs video signals transmitted from a plurality of external photographing apparatuses such as CCTV, and the switching unit 10. And a time-lapse video recording and reproducing apparatus 20 which selects only one video signal of any one frame among video signals of the selected specific photographing apparatus outputted from and to record on a recording tape for each frame.

In the conventional time-lapse video recording and reproducing apparatus configured as described above, for example, when the user wants to record 18 hours of video using a 2 hour tape, the switching unit 10 transmits a video signal from the first camera 1. After receiving, when the time corresponding to 9 frames (= 9 × 1/30) elapses, the camera 2 switches to the camera 2 and receives the video signal. Selective output sequentially in intervals.

The time-lapse video recording / reproducing apparatus 20 selects and records only one specific frame from a video signal for a predetermined time input by the switching unit 10, that is, the time-lapse video recording / reproducing apparatus 20 When the recording is set for a time, the time-lapse video recording and reproducing apparatus 20 is first shown in FIG. 2 to A1 to A9 sequentially input from the camera 1 by the switching unit 10. Select only one frame (A1 frame) among the video frames, and control the capstan motor to record the input video signal while advancing the recording tape frame by frame.In this case, the preset recording time (18 hours) Based on this, the video frame of A2 ~ A9 is not recorded, and the recording pause state is maintained for the time corresponding to A2 ~ A9 frame after recording A1 frame. The.

As described above, the time-lapse video recording / reproducing apparatus 20 continuously repeats recording and recording pause as described above with respect to video signals sequentially input from a plurality of cameras by switching of the switching unit 10. While performing the intermittent recording operation.

During such intermittent recording, if an alarm signal informing of an emergency is input from a security sensor mounted on a specific camera, the time-lapse video recording / reproducing apparatus 20 starts from that time or until the alarm signal is released. For a predetermined time, the video signal input from the camera is continuously recorded on the recording tape in real time, so that an emergency situation or cause can be confirmed through a later playback screen.

However, the conventional time-lapse video recording and playback player operating as described above performs the intermittent recording as described above until the alarm signal is input from the security sensor, and performs the continuous recording in real time after the alarm signal is input. In case of an emergency situation such as a fire, the screen to check the situation or cause at that time is discontinuous so that it is not possible to provide an accurate image of the situation immediately before the emergency condition occurs, or the immediately preceding screen is not recorded at all. Frequently, there was a problem that it is difficult to pinpoint the cause and situation when an emergency occurs.

Accordingly, an object of the present invention is to provide a method for recording an alarm before and after an alarm of a time-lapse video recording and reproducing apparatus which is designed to solve the above problems and records an image before and after an emergency occurs on a recording medium. .

1 is a block diagram of a general time-lapse video recording and reproducing apparatus.

FIG. 2 shows a recording form of the time-lapse video recording / reproducing apparatus of FIG.

Figure 3 shows the configuration of a time-lapse video recording player for implementing the before and after video recording method of the alarm of the time-lapse video recording player according to the present invention,

Figure 4 shows the flow of a preferred embodiment of the alarm before and after video recording method of the time-lapse video recording player according to the present invention,

5 and 6 illustrate a recording form of the time-lapse video recording / reproducing apparatus of FIG.

FIG. 7 illustrates another configuration of a time lapse video recording player for implementing a method of recording before and after an alarm in a time lapse video recording player according to the present invention;

8 and 9 show a recording format made in the time-lapse video recording / reproducing apparatus of FIG.

※ Explanation of code for main part of drawing

10: switching unit 20: time-lapse video recording and playback device

31, 32, 33: Security sensor 40: Selection switch

50: rust ash 60: control unit

70: code generator 71: signal synthesizer

80: code detector

According to an aspect of the present invention, there is provided a method for recording an image before and after an alarm of a time-lapse video recording / reproducing apparatus, comprising: a first step of continuously recording an input video signal on a recording medium for a predetermined time; A second step of advancing the recording medium backward by a section smaller than the section distance recorded in the first step after the recording for the predetermined time is completed; And a third step of continuously recording a video signal input from a current position while advancing the recording medium in the case of an emergency during repeating of the first and second steps.

In addition, a first step of recording the input video signal on the recording medium for a predetermined time; A second step of, after completion of the recording for the predetermined time, advancing the recording medium in the reverse direction again for the predetermined time; A third step of, after completion of the reverse progress, forwarding the recording medium forward for a time smaller than the predetermined time and searching for a next recording position; And a fourth step of continuously recording a video signal input from a current position while advancing the recording medium forward when an emergency condition occurs during the repetition of the first to third steps.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a video recording method before and after an alarm in a time-lapse video recording and playback player according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 shows the configuration of a time-lapse video recording player for implementing the alarm before and after video recording method of the time-lapse video recording player according to the present invention, such as a predetermined time interval or security sensors (31, 32, ...) A selection switch 40 for changing a path of an input signal according to external motion detection; A recording unit (50) for recording the selected output video signal on a recording tape and performing a playback operation on the video signal recorded on the recording tape; And a controller 60 for controlling the switching of the selection switch 40 and the rust process of the rust material part 50.

FIG. 4 is a flow chart showing a preferred embodiment of a method for recording an alarm before and after an image of a time-lapse video recording and playback player according to the present invention. Hereinafter, the recording method of FIG. 4 according to the present invention will be described with reference to the configuration of FIG. It explains in detail.

First, the security cameras (31, 32, ...) are installed in the important places to monitor the surroundings, and the surveillance cameras are to shoot the surroundings, and the security sensors (31, 32, ...) continues to detect whether an emergency condition (movement detection, door open detection, etc.) occurs in a critical location where surveillance cameras are installed.

The control unit 60 performs the intermittent recording as in the above-described conventional crime prevention before setting the alarm mode, and the user sets the alarm mode through the control unit 60 (S10). Then, the controller 60 controls the rust ash unit 50 so that the selection switch 40 performs a selective operation while repeatedly performing a switching operation at a predetermined time T _int . The photographed video signal of the user may be continuously recorded 100 on a recording tape in real time for a preset time (for example, 10 minutes).

When the real-time continuous recording for the predetermined time of the green ash portion 50 is completed, the controller 60 controls the green ash portion 50 to reverse the progression of the recording tape 101, that is, as shown in FIG. The tape is rewinded so as to be located at the start point of real time continuous recording. After completion of the rewinding of the recording tape of the rusting portion 50, the recording tape is forwarded again in a predetermined section under the control of the controller 60, and the time T corresponding to the predetermined section d is connected. Time corresponding to the entire image frame photographed by the external cameras respectively during the predetermined time T _int . When the number of external cameras connected is N, the time T corresponding to the predetermined interval is N × T _int × The time corresponds to 30 frames.

Until the alarm signal is generated as described above, the rusting unit 50 is controlled by the controller 60 and reverses the video signal recording 100 and the recording tape for a predetermined time (10 minutes) as shown in FIG. 5. In step 101, the recording section of the tape is gradually advanced (d) while continuing (S11) the operation of forwarding the predetermined section of the recording tape (section of N × T _int × 30 frame size) continuously.

In addition, when the recording tape of the green material unit 50 proceeds backward, instead of rewinding the recording tape to the real time continuous recording start point P1 as described above, as shown in FIG. In consideration of the forward progress, the recording tape may be rewound 101 'only from the start point of the real time continuous recording to the point P2 spaced apart from the predetermined section in the forward direction (N × T _int × 30 frame size section).

During the repeating of the above operation, a specific security sensor, for example, the security sensor 31 for detecting an emergency state of the place where the camera 1 is installed detects a preset emergency state and applies an alarm signal to the control unit 60. In operation S20, the controller 60 controls the selection switch 40 to be fixedly connected to the terminal a so as to continuously output an image signal input from the camera 1 linked to the crime prevention sensor 31. The green material unit 50 continuously records 102 video signals input from the camera 1 in real time while advancing the recording tape from the current position in the forward direction (S21).

Such a recording operation is continuously performed for a predetermined time set by the user (for example, 20 minutes) or until the alarm signal is released. If the predetermined time has elapsed or the alarm signal is released (S30), The control unit 60 controls the selection switch 40 according to the setting of the alarm mode until the recording stop command input (S40) to perform the switching operation at predetermined time intervals as before the alarm signal is generated, As shown in FIG. 5 or FIG. 6, the video signal recording 100 and the reverse operation 101 or 101 'of the recording tape are repeatedly performed for a predetermined time.

By such a recording operation, the image before the alarm signal is continuously recorded, and is stored without being updated and recorded by the subsequent signal.

FIG. 7 illustrates another configuration of a time lapse video recording player for implementing an alarm before and after video recording method of a time lapse video recording player according to the present invention. A code generator 70 for generating and outputting a signal inserted into a specific horizontal line in the vertical retrace section of the video signal corresponding to the code; A synthesizer 71 for synthesizing the received video signal and the signal output from the code generator 70; And a code detector 80 for detecting the position identification code carried in the vertical retrace section of the video signal.

In the time-lapse video recording player configured as described above, the controller 60 controls the recording unit 50 according to the input setting of the alarm mode as described above (eg, 10 minutes) to the real-time continuous recording 100 to the recording tape, the control unit 60 is a real time continuous recording for a predetermined time (10 minutes) as shown in Figure 8 and 9 At the point R1, the position identification code is output to the code generator 70 so that a corresponding signal is generated.

Accordingly, the code generator 70 receiving the code generates and outputs a signal corresponding to the code, which is to be mounted on a specific horizontal line in the vertical retrace section of the video signal to be recorded, and the signal synthesizer 71 By synthesizing the input video signal and the generated output signal to the recording unit 50, the video frame is synthesized by the position identification code is recorded on the recording tape.

When the real time continuous recording for a predetermined time (10 minutes) of the green material unit 50 is completed together with the recording of the image frame in which the position identification code is synthesized, the controller 60 controls the green material unit 50. By repeating the above-described progression of the recording tape (101, 101 ') and the above-described process, real time continuous recording for a predetermined time (10 minutes) before generating an alarm signal as shown in Figs. The position identification code is inserted and synthesized in the video signal recorded at each point (R1, R2, R3, ..) where is completed.

When an alarm signal is applied to the control unit 60 during the repetitive execution of the above operation, the control unit 60 checks the current state of the recording tape by the rusting unit 50, and the recording tape is currently continuous in real time. When not in the recording state 100 (for example, in the reverse progression state 101 or 101 '), the green portion 50 is controlled to record the last position identification code of the recording tape, that is, the last recording. When the last recording position of the recording tape is confirmed from the position identification code detected by the code detector 80, the controller 60 controls the rusting unit 50 to determine the present current. The real time continuous recording 102 is performed while the recording tape moves forward from the position.

If an alarm signal is applied to the control unit 60 in the real time continuous recording state 100 of the recording tape, the control unit 60 controls the green ash unit 50 to perform the real time continuous from the current position of the recording tape. By performing the recording 102, the real-time continuous recording 102 for a predetermined time according to the alarm signal generation is made from the last recorded position of the recording tape.

According to the present invention, the time-lapse video recording and reproducing method of the alarm before and after the video recording method according to the present invention, not only the image after the occurrence of the alarm signal notifying the occurrence of the emergency state, but also the image before the alarm signal generation continuously recording on the recording medium By doing so, it is a useful invention to accurately grasp the state, shape, or cause of the disaster of the monitoring object from the main image photographed before and after an emergency occurs.

Claims (7)

In the video signal recording method, A first step of continuously recording an input video signal on a recording medium for a predetermined time; A second step of advancing the recording medium backward by a section smaller than the section distance recorded in the first step after the recording is completed for the predetermined time; And When the emergency state occurs during the repeating steps of the first and second steps, the video recording before and after the alarm including a third step of continuously recording the video signal input from the current position while moving the recording medium in the forward direction How to record. The method of claim 1, The continuous recording of the third step, the alarm before and after video recording method characterized in that the time-lapse video recording and playback until the release of the emergency state. The method of claim 1, And the continuous recording of the third step is performed for a predetermined time set by the user. In the video signal recording method, A first step of continuously recording an input video signal on a recording medium for a predetermined time; A second step of, after completion of the recording for the predetermined time, advancing the recording medium in the reverse direction again for the predetermined time; A third step of, after completion of the reverse progress, forwarding the recording medium forward for a time smaller than the predetermined time and searching for a next recording position; And And a fourth step of continuously recording the video signal input from the current position while forwarding the recording medium in the case of emergency during the repeating of the first to third steps. How to record. The method of claim 4, wherein The time smaller than the predetermined time is a time corresponding to a recording section in which at least one video frame photographed from an external camera connected to the signal is recorded. In the video signal recording method, A first step of continuously recording an input video signal on a recording medium for a predetermined time; A second step of advancing the recording medium backward by a section smaller than the section distance recorded in the first step after the recording is completed for the predetermined time; And And a third step of continuously recording a video signal inputted from the last recorded position of the recording medium when an emergency condition occurs during the repeating of the first and second steps. In the video signal recording method, A first step of continuously recording an input video signal on a recording medium for a predetermined time; A second step of, after completion of the recording for the predetermined time, advancing the recording medium in the reverse direction again for the predetermined time; A third step of, after completion of the reverse progress, forwarding the recording medium forward for a time smaller than the predetermined time and searching for a next recording position; And And a fourth step of continuously recording a video signal input from the last recorded position of the recording medium when an emergency occurs during repeating of the first to third steps.