KR920008625Y1 - Auto-recording control apparatus - Google Patents

Abstract

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Description

Automatic motion control device for capturing subject movement

1 is a circuit diagram of an automatic recording control apparatus for capturing subject movement according to the present invention.

FIG. 2 is a flowchart illustrating a process of generating a control signal according to the movement of a subject in a surveillance area performed by the microcomputer of FIG.

3 is a screen diagram showing a monitoring zone set on a monitor screen.

* Explanation of symbols for the main parts of the drawings

10: synchronization signal separator 20: micom

30: delay 40: monomultivibrator (MM)

50: AND gate 60, 70: sample and holding circuit

80, 90: delay 100, 110: comparator

120: OR gate 300: surveillance area setting means

400: comparison means

The present invention relates to an unmanned surveillance apparatus, and more particularly, to a subject motion capture automatic recording control apparatus capable of automatically controlling a recording operation when capturing motion of a subject.

In camcorders, i.e., camera-integrated magnetic recording and reproducing apparatuses, due to the finiteness of the recording medium, the time required for monitoring can be limited. In addition, when the movement of the subject is intermittently generated over a long time interval, there is a problem in that the recording medium is unnecessarily consumed.

For example, in an unmanned medical surveillance system, if the monitoring time is six hours, a recording medium capable of continuously recording for six hours is required. However, if there is little movement of the subject in the time zone, only the same scene is unnecessarily recorded on the recording medium. This has the disadvantage of being very inefficient in terms of use of the recording medium.

In order to overcome the above problems, it is an object of the present invention to provide an automatic recording control device that can automatically perform recording information by detecting the change in contrast according to the movement of the subject.

In order to achieve the above object, an automatic recording control apparatus for capturing a subject's motion according to the present invention receives image information of a subject through a camera and converts the image signal into a magnetic tape. A sync signal separator for separating the vertical and horizontal signals; Surveillance area setting means for setting a predetermined area of the screen as a monitoring area by receiving the vertical and horizontal synchronization signals; And a comparison means for generating a recording control signal when the video signal in the set surveillance area is different from the video signal sampled at the previous stage of the video signal.

When the present invention will be described in more detail with reference to the accompanying drawings.

1 is a circuit diagram of a subject motion detection circuit of an unmanned automatic recording control apparatus according to the present invention. In FIG. 1, the video signal is input and the sync signal separator 10 separates the vertical and horizontal sync signals, respectively, and the vertical and horizontal sync signals are supplied to the microcomputer 20 to set the monitoring zone in the monitor. Outputs a control signal (G) that defines.

At this time, the monitoring zone to be set may be set as a monitoring zone for the entire screen on the monitor, but in the embodiment of the present invention, the boundary of the screen is set up and down and left and right by a certain amount of screen as the center point of the screen.

The generation process of the control signal G will be described with reference to FIG. 2 is a flowchart of a program in which the control signal G is generated, which means that when the program starts, the control signal G output from the output terminal initially maintains the low phase G = O and A (the Y axis on the screen). The upper boundary value) B (the lower boundary value of the X axis on the screen) designates a random number between 1 and 262H-SYNC, and sets the B value to be larger than the A value (step 100).

For example, when the signal focus changes between the H-SYNC 50 and 150 lines, the VTR causes the recording to be performed. First, it is determined whether V-SYNC is detected (step 101), and if V-SYNC is not detected, it is fed back until V-SYNC is input, and if detected, H is reset to O (step 101, 102). ). H is a variable set to check whether the detected signal on the screen is in the surveillance area.

At this time, the control signal G (the initial low state signal) from the microcomputer 20 is output (step 103) and the counter of "H" is incremented by one (step 104). At this time, check that H = 263 (that is, the scan line reaches the bottom of the screen) (step 105), and terminate the program if correct. After the entire screen is examined, the above process is repeated.

However, if H is equal to or less than 262, it is determined whether H is equal to or greater than 50 (step 106). If not, the output is set to "low (G = 0)" (step 107) after the control signal is output (step 103). ) "H" is incremented (step 104). This routine continues to determine if H is greater than 50 and H is less than 150 (step 108). If H is 150 or less, the control signal G is set to high (G = 1) (step 109), and then the flow returns to step 103 to output the control signal. If H continues to increase and H is greater than 150, the control signal G is reset to a low state (G = 0) (step 110), and then returns to step 103 to output (step 110). ). As shown in the flowchart of FIG. 2, the control signal G keeps the output high (G = 1) when H is between 50 and 150, and keeps low (G = 0).

On the other hand, the horizontal synchronizing signal triggers the mono-multi vibrator (MM) 40 via the delay unit 30. This monovibration vibrator 40 generates a pulse having a pulse width determined according to the time constants of the resistor R1 and the capacitor C1. The pulse width of the panel defines a horizontal section (section C to D on the screen) for setting the monitoring zone.

Accordingly, the AND gate 50 performs an AND operation on the control scene G from the microcomputer 20 and the pulses from the monomultivibrator 40 to perform a supervisory area (ABCD) as shown in FIG. ) Outputs a "high" signal when there is movement of the projectile. That is, the delay unit 30 delays the horizontal synchronizing signal to point C of FIG. 3, and generates a pulse in the MM 40 which makes the CD section the pulse width in the CD section.

The surveillance zone bath (ABCD) is an area where the focus of the camera is adjusted to achieve the focus of the subject.

The switching number SW1 is turned on by the "high" output of the AND gate 50 so that the video signal is supplied to the comparing means only in the surveillance region ABCD region. The comparison means compares the level of the input video signal with the video signal for detecting a change in contrast, that is, a change in the level of the video signal according to the movement of the subject.

The comparison means in FIG. 1 includes first and second sample and holding circuits 60 for sample and holding the video signal input through the switching means SW1 at the "high" output of the AND gate 50. 70) and a first and second video signals delayed through the first and second delay means 80 and 90, and the first video signal is inputted to the non-inverting terminal of the first comparator 100 to the inverting terminal. It is compared with the input video signal. Therefore, the first comparator 100 outputs a "high" signal when it darkens in response to the movement of the subject, and outputs a "low" signal in other cases.

On the other hand, when at least one of the output signals from the first and the first comparators 100 and 110 is "high", the microcomputer (OR) is connected to the diode logic OR gate composed of two diodes D1 and D2 via the OR gate 120. Supplied with the signal from 20) and logically summed at the OR gate so that the system performs the write operation. At this time, the signal output from the microcomputer 20 to the diode D1 has a logic of "high" or "low" state by the user's setting. In other words, when the user sets the logic state to "low", it may be the case that the recording of the subject is used automatically by detecting the movement of the subject generally used in the present invention. This is when recording is done regardless.

As described above, the automatic recording control device when capturing the movement of the subject performs recording operation when capturing the movement of the subject, thereby preventing unnecessary waste of the video tape, thereby enabling efficient use of the tape.

Claims (1)

An unmanned surveillance apparatus for receiving image information of a subject through a camera and converting the image information into an image signal and recording the same on a magnetic tape, comprising: a synchronization signal separator (10) for separating the vertical and horizontal synchronization signals of the image signal; Monitoring area setting means (300) for receiving a vertical and horizontal synchronization signal separated from the synchronization signal separator (10) to set a predetermined area of the screen as a monitoring area; And comparing means (400) for generating a recording control signal when the video signals in the set surveillance area and the video signals sampled and delayed at the previous stage of the video signal are respectively different from each other. The area setting means outputs a control signal for determining whether the focus of the subject is included in the vertical section between the upper and lower ends of the surveillance area on the screen by using the vertical synchronization signal separated by the synchronization signal separator 10. Micom 20; A delay unit 30 for delaying a horizontal synchronization signal from the synchronization signal separator 10 for a predetermined time; A monovibrator 40 for generating a pulse width having a predetermined width representing a horizontal section according to the input of the horizontal synchronization signal delayed through the delay unit; And an AND gate for determining whether or not the focus of the subject is within the surveillance region by performing an AND operation on the control signal from the microcomputer and the pulse from the multi-multi vibrator 40. Control unit.