KR100394985B1 - Monitoring camera - Google Patents

Abstract

PURPOSE: A monitoring camera is provided to easily monitor a moving object by calculating and displaying a moving path of the moving object. CONSTITUTION: A first video memory(23) stores video data of a current area to be monitored. A second video memory(25) stores video data of the area before a predetermined time. A control unit(21) controls data input and output of the first video memory and the second video memory. A subtracting unit(29) subtracts the video data of the second video memory from the video data of the first video memory. The result of the subtraction is shown on a screen as a moving path of a moving object. An adding unit(27) adds up the video data of the first video memory and the result of the subtraction.

Description

Security camera

The present invention relates to a surveillance camera, and more particularly, to a surveillance camera that can easily monitor a moving object.

In general, surveillance camera system refers to cameras for monitoring specific areas such as industrial, military, civilian, and other devices that control them.

FIG. 1 is a block diagram for explaining a conventional surveillance camera. In FIG. 1, reference numeral 1 denotes a lens unit, 3 denotes a sensor unit, 5 denotes a signal conversion unit, 7 denotes an operation switch, Are respectively a video signal processing unit.

The lens unit 1 determines a monitoring distance through forward and backward movement and collects a light source or infrared rays to be sensed by the sensor unit 3 at a rear end.

The sensor unit 3 serves to sense a light source or infrared ray that has passed through the lens unit 1.

The signal converting unit 5 converts the signal sensed by the sensor unit 3 into a signal capable of signal processing by the subsequent video signal processing unit 10. [

The video signal processing unit 10 includes a microprocessor and a peripheral circuit 11 and an image memory 13 and displays a surveillance region on the surveillance monitor 9 using a signal input from the signal converting unit 5 Process the video signal. The microprocessor and the peripheral circuit 11 are responsible for processing the video signal and the video memory 13 is for temporarily storing the processed video signal.

The stove unit 1 collects light or infrared rays into a single spot so that the sensor unit 3 at the rear end can detect the light source or the infrared rays. The signal sensed by the sensor unit 3 is converted into a signal suitable for the subsequent image processing through the signal conversion unit 5. The video signal processor 10 processes the video signal in accordance with the purpose and characteristics of the monitor, and the processed video signal is input to the monitor 9 to display the surveillance area.

However, as described above, the conventional surveillance camera has little problem in monitoring when the surveillance distance is short, but when the surveillance distance is long, it is slow in reading the object. Especially when the surveillance camera is small, It is difficult to track the movement route. In order to solve this problem, a method of attaching a separate recording apparatus and analyzing the recorded video image again is used. Therefore, additional expense for a separate recording device is required, and it takes time to analyze the playback screen.

SUMMARY OF THE INVENTION It is, therefore, an object of the present invention to provide a surveillance camera capable of capturing a moving object and tracking the movement path thereof in order to solve the above-mentioned problems.

According to another aspect of the present invention, there is provided a surveillance camera including a storage unit for storing first and second image data for a surveillance area having a predetermined time interval,

A subtraction section for subtracting the second image data from the first image data output from the storage section,

And an adding unit for adding the first image data output from the storage unit and a subtraction result output from the subtraction unit. According to the present invention, the subtraction result of the subtraction unit appears on a moving path of the moving object on the screen.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram for explaining a surveillance camera according to the present invention. In FIG. 2, reference numeral 21 denotes a control unit, reference numeral 23 denotes a first image memory, reference numeral 25 denotes a second image memory, reference numeral 27 denotes an adding unit, reference numeral 29 And a monitor monitor 31, respectively.

The first image memory 23 is a memory for storing image data for a current monitoring area and the second image memory 25 is a memory for storing image data for a surveillance area before a predetermined time.

The control unit 21 controls data input / output of the first and second image memories 23 and 25.

The subtraction section 29 subtracts the image data M2 from the second image memory 25 from the image data M1 from the first image memory 23. [ That is, the previous image data is subtracted from the current image data.

The addition section 27 adds the image data M1 from the first image memory 23 and the subtraction result DELTA M from the subtraction section 29. [

The operation according to the above configuration will be described with reference to FIG.

First, imaging is started with respect to a preset monitoring area (110).

And stores the image data of the surveillance region generated through the shooting in the first and second image memories 23 and 25 at predetermined time intervals. At this time, the first image memory 23 stores the image data for the current monitoring area, and updates the stored image data at predetermined time intervals. Similarly, the second image memory 23 stores the image data for the surveillance area before the predetermined time, and the stored image data is updated with the image data for the current surveillance area at predetermined time intervals. Although the two memories 23 and 25 are used in the present embodiment, the image data may be sequentially stored in units of memory blocks using one memory.

Subsequently, the previous image data M2 stored in the second image memory 25 from the current image data M1 stored in the first image memory 23 at a predetermined time interval is read out by the control unit 21 Subtract. At this time, when the subtraction result? M is displayed on the screen, the moving path of the moving object becomes the moving path as shown in FIG. 2 (130).

Subsequently, the adding unit 27 adds the current image data M1 stored in the first image memory 23 and the subtraction result? M from the subtracting unit 29 (140).

Subsequently, the surveillance region and the movement path of the moving object are displayed by outputting the addition result from the addition section 27 on the monitor monitor 31 (150)

As described above, the present invention has an advantage in that it is easy to monitor a moving object by calculating a moving path for the moving object and displaying it on the screen.

FIG. 1 is a block diagram for explaining a conventional surveillance camera; FIG.

FIG. 2 is a block diagram for explaining a configuration of a surveillance camera according to the present invention; FIG.

FIG. 3 is an operational flowchart for explaining the operation of the surveillance camera shown in FIG. 2; FIG.

Claims (1)

A storage unit for storing first and second image data for a surveillance area having a predetermined time interval; A subtraction unit for subtracting the second image data from the first image data output from the storage unit; And And an adder for adding the subtraction result output from the subtracting unit to the first image data output from the storage unit.