KR20150090633A - Surveillance Camera Control System - Google Patents

Abstract

According to one embodiment of the present invention, provided is a surveillance camera control system which comprises: at least one surveillance camera moving along a moving path and acquiring a captured image of a surveillance area at a plurality of image pick-up positions; and a control server for determining a moving speed of the surveillance camera based on an image hormone value, wherein the control server calculates an image hormone value at a current position of the surveillance camera, an image hormone value at a left position thereof and an image hormone value at a right position thereof, and thereby determining a moving direction and a moving speed of the surveillance camera, wherein an image hormone value at a particular image pick-up position decreases whenever a predetermined time elapses, and decreases whenever a movement is detected in an image captured at the particular image pick-up position.

Description

{Surveillance Camera Control System}

The present invention relates to a surveillance camera control system, and more particularly, to a surveillance camera control system capable of automatically selecting a position of a camera in consideration of a last imaging time and existence of a moving object.

Recently, demand for surveillance systems is increasing for various applications in various fields. A general surveillance system installs a camera in the area to be monitored and uses a method in which a surveillant monitors the camera image. A pant-tilt-zoom camera, which is often used as a surveillance camera, can acquire images within a fixed angle from a fixed position. Conventional surveillance camera systems require surveillance personnel, and there is a limit in the range that the surveillant can monitor.

In order to solve such a problem, a camera which moves along a fixed axis or a path has been developed. Typically, there is a surveillance camera that moves along an installed rail. A camera that moves along a path or axis has the advantage that it can change the imaging area when compared to a fixed camera, but like a conventional camera, one manpower must be input to manipulate a camera.

An object of the present invention is to provide a surveillance camera control system in which at least one surveillance camera moves along a movement path, and the position of the surveillance camera is automatically determined according to the time and the motion detection time of the last imaging at a specific position .

According to an embodiment of the present invention, at least one surveillance camera moving along a movement path and acquiring an image of a surveillance region at a plurality of imaging positions; And a control server for determining a moving speed of the surveillance camera on the basis of a video hormone value, wherein the control server includes a video hormone value at a current position of the surveillance camera, a video hormone value at a left position, And determines a moving direction and a moving speed of the surveillance camera. The video hormone value at a specific imaging position is decreased each time a predetermined time elapses, and when a motion is detected on the image picked up at the specific imaging position A surveillance camera control system is provided.

In the present invention, the video hormone value decreases by a weight every time a predetermined time passes, and increases by a reference value each time the surveillance camera captures the specific position.

In the present invention, the image hormone value is calculated by adding a pixel hormone value, and a pixel hormone value in which motion is detected in the image picked up at the specific image pickup position is set to zero.

According to the present invention, the position of the surveillance camera can be automatically determined even if a person does not set the position of the surveillance camera.

1 is a view schematically showing a configuration of a surveillance camera control system according to an embodiment of the present invention.
2 is a view showing an example of a movement path of a surveillance camera according to an embodiment of the present invention.
FIG. 3 is a diagram illustrating a panoramic image generated by combining surveillance images acquired by a surveillance camera according to an exemplary embodiment of the present invention.
FIG. 4 is a table illustrating the moving speed of the camera.
5 is a diagram illustrating a process for determining the position of a surveillance camera in accordance with an embodiment of the present invention.

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, the specific shapes, structures, and characteristics described herein may be implemented by changing from one embodiment to another without departing from the spirit and scope of the invention. It should also be understood that the location or arrangement of individual components within each embodiment may be varied without departing from the spirit and scope of the present invention. Therefore, the following detailed description is not to be taken in a limiting sense, and the scope of the present invention should be construed as encompassing the scope of the appended claims and all equivalents thereof. In the drawings, like reference numbers designate the same or similar components throughout the several views.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to facilitate a person skilled in the art to which the present invention pertains.

1 is a view schematically showing a configuration of a surveillance camera control system according to an embodiment of the present invention.

Referring to FIG. 1, a plurality of surveillance cameras 100-1, 100-2,..., 100-n exchange data with a control server 300 through a network 200. FIG. Specifically, the surveillance cameras 100-1, 100-2, ..., 100-n communicate with the control server 300 through a communication channel DCOM, To the control server (300). Of course, it is needless to say that only one camera, not a plurality of cameras, can communicate with the control server 300, and one camera or a plurality of cameras can communicate with the plurality of control servers 300 .

In the following description, a plurality of surveillance cameras 100-1, 100-2, ..., 100-n may be represented by a surveillance camera 100, May be used to refer to any one of the cameras 100-1, 100-2, ..., 100-n.

The plurality of surveillance cameras 100 according to an embodiment of the present invention are configured to move along a set movement path. That is, the moving path of the surveillance camera 100 may be a moving path on a rail or a tunnel already installed, and one surveillance camera 100 may be installed on one moving path, or a plurality of surveillance cameras 100 100 may be installed.

The network 200 forming the communication channel (DCOM) and the video data channel (DIMA) may be any means capable of transmitting and receiving data or commands in a wired or wireless manner. For example, the network 200 may connect the camera 100 and the control server 300 by wire through a cable, connect the camera 100 and the control server 300 wirelessly using a wireless LAN, have. Preferably, the network 200 may be a local area network, such as an ethernet network.

The control server 300 of FIG. 1 includes a computing device and may send commands to control the location of the surveillance cameras 100 by determining the location of the surveillance camera 100. The control server 300 can use a position determination algorithm so that the surveillance cameras 100 can automatically determine the position. According to an embodiment of the present invention, the control server 300 determines the moving direction and the moving speed of the surveillance camera 100, and the position where the time elapses from the last imaging time elapses, The more the surveillance camera 100 moves.

The control server 300 may be a computing device having a display screen. For example, a personal computer or the like may be used as the control server 300. The control server 300 may store images from the camera 100 as needed.

2 is a diagram illustrating an example of a movement path of the surveillance camera 100 according to an embodiment of the present invention.

Referring to FIG. 2, it can be seen that the first surveillance camera 100-1 moves on the first axis 1 axis and the second surveillance camera 100-2 moves on the second axis 2 have. The first surveillance camera 100-1 and the second surveillance camera 100-2 are cameras for capturing a surveillance area.

The first surveillance camera 100-1 on the first axis axis1 moves from the first position Z1 to the second position Z2 to the third position Z3 and captures the surveillance zone. The first surveillance camera 100-1 is moving in the right direction U1. At this time, the first surveillance camera 100-1 may pause for capturing an image at each of the positions Z1, Z2, and Z3, and then move to the next position. Further, the first surveillance camera can acquire the captured image at each of the positions Z1, Z2, and Z3, but may move to the next position without capturing the image at some positions.

The second surveillance camera 100-2 on the second axis 2 moves the first surveillance camera 100-1 from the first position Z1 to the second position Z2 and to the third position Z3 It is possible to move to the left direction U2 which is the opposite direction. The second surveillance camera 100-2 also acquires the captured image of the surveillance region while sequentially moving the respective positions.

FIG. 3 is a diagram illustrating a panoramic image generated by combining surveillance images acquired by a surveillance camera according to an exemplary embodiment of the present invention.

In the example of Fig. 3, the first image s1, the second image s2 and the third image s3 are combined to produce one panoramic image M1. The first image s1, the second image s2 and the third image s3 may be images obtained by moving the first surveillance camera 100-1 on the first axis. That is, when the first camera 100-1 is located at the first position z1 and the captured image of the obtained surveillance region is the first image s1, and the captured image is located at the second position z2, The captured image of the surveillance image is the second image s2 and is located at the third position z3 and the captured image of the obtained surveillance region may be the third image s3. At this time, there may exist an imaging region in which one image (s1), the second image (s2), and the third image (s3) overlap each other. The control server 300 creates one panoramic image M1 by referring to overlapping regions between images.

According to the embodiment of the present invention, since the captured image obtained by the surveillance camera 100 is generated as an after-panorama image, unlike a case where one camera captures only a limited area in one space, a panorama image is acquired can do.

According to one embodiment of the present invention, the control server 300 can determine the direction and the moving speed at which the surveillance camera 100 is to move in the current position of the surveillance camera 100 in order to determine the moving position of the surveillance camera 100. As described above, the control server 300 can transmit a control signal so that the surveillance camera 100 moves to a position where a long time has elapsed since the last image capturing or a motion was detected.

Movement position determination of the surveillance camera 100 may be determined in a modified form of a digital hormone algorithm. The digital hormone algorithm is a technique in which when a position of the surveillance camera 100 is set, a position where a lot of time elapses in the last imaging time is preferentially selected and a place where a lot of motion is detected is set as a priority position .

Hereinafter, a position control algorithm of the surveillance camera 100 according to an embodiment of the present invention will be described.

First, the control server 300 sequentially captures images of all positions using the surveillance camera 100 so as to obtain the entire image of the surveillance area in the initial state. At this time, all possible positions in the movement path of the surveillance camera 100 are expressed as Z1, Z2, Z3, ..., Zi, ..., and the images acquired at the respective positions are S1, S2, S3, .... ., Si, ....

Next, the control server 300 allocates basic hormone values to all pixels of each image S1, S2, S3, ..., Si, ..., respectively. Hereinafter, the hormone value of the j-th pixel of the image Si picked up at the i-th position Zi is represented by pji. The hormone value pji is a variable value that is a reference value for determining whether the surveillance camera 100 moves to the position in the present invention. The hormone value decreases as the time elapses from when the surveillance camera 100 takes an image, and decreases as the motion is detected.

For example, when the first surveillance camera 100-1 is at the i-th position Zi, the hormone value pji may be assigned to each pixel of the image Si picked up at the i-th position Zi have. The surveillance camera 100-1 has a greater tendency to move to the corresponding position as the sum of the hormones of the captured image Si becomes smaller.

When the surveillance camera 100-1 captures an image of 800 * 600 resolution, the range of the j value may be set to j = 0 to 47999. [ At this time, the hormone value (pji) of the j-th pixel has a maximum value (Maxhormone), and decreases with time. That is, the pji value can be decreased by the weight value Dw every time the time passes by t. Conversely, at the moment one of the cameras 100 picks up an image at the i-th position Zi, the hormone value pji may increase by the weighted value Dw.

For example, if the maximum value (Maxhormone) is 10 and Dw is 1, the hormone value (pji) of the j-th pixel decreases by one every time one minute passes and ultimately becomes zero. As the hormone value pji approaches zero, the surveillance camera 100 has a tendency to preferentially move to the i-th position Zi. On the contrary, the moment the surveillance camera 100 captures an image at the i-th position (Zi), the hormone value (pji) increases by one. As the hormone value pji approaches 10, the surveillance camera 100 has a tendency to preferentially be arranged at a position different from the i-th position Zi. Due to such a change in the hormone value pji, the surveillance camera 100 can preferentially move to a position where a long time has elapsed since the imaging.

The hormone value pji of the j-th pixel is updated to 0 when a moving object is detected at the j-th pixel. This is to set the hormone value pji unconditionally to the lowest value so that more surveillance cameras 100 can move quickly to the place where a moving object is detected.

The moving speed of the surveillance camera 100 is as follows. The control server 300 according to an embodiment of the present invention determines the moving position of the surveillance camera 100 by updating the direction and velocity value of each surveillance camera 100 in real time. The surveillance camera 100 is set to move the surveillance camera 100 to the right when the speed value v is positive at the current position Zi and move to the left when the surveillance camera 100 is negative. The control server 300 can automatically set the position of the surveillance camera 100 by updating the moving speed and the moving direction in real time with the speed value v.

When the velocity value v of each surveillance camera 100 is Velocitycam, the velocity of the surveillance camera 100 can be expressed by the following equations (1) to (4).

[Equation 1]

Velocitycam = Max_speedcam * (Diffhormone (L) - Diffhormone (R)) / Maxhormone

 &Quot; (2) "

Diffhormone (L) = Hi-Hi-1

&Quot; (3) "

Diffhormone (R) = Hi-Hi + 1

&Quot; (4) "

Hi = (? Pji) / j

As described above, a value obtained by adding all the hormone values pji of the j-th pixel becomes the video hormone value Hi of the i-th position Zi. Therefore, the Diffhormone (L) is different from the video hormone value Hi at the i-th position Zi and the video hormone value Hi-1 at the immediately left position, i.e., the i-1 position Zi-1 ) Value. Diffhormone (R) is the difference value between the video hormone value Hi at the i-th position Zi and the video hormone value Hi + 1 at the immediately right position, i.e., the i + 1 position Zi + 1.

FIG. 4 is a table illustrating the moving speed of the camera.

The example of FIG. 4 illustrates that the velocitycam varies depending on the values of Hi, Hi-1 and Hi + 1 when Max_speedcam is set to 100 and Maxhormone is set to 10.

Referring to FIG. 4, when Diffhormone (R) is larger than Diffhormone (L), the surveillance camera 100 moves to the right, while when the surveillance camera 100 is small, the surveillance camera 100 moves to the left. This is because the surveillance camera 100 moves in a direction toward a neighboring location where the difference of the video hormone is large according to an embodiment of the present invention, and the speed of the surveillance camera 100 increases as the difference of the video hormone increases.

5 is a diagram illustrating a process for determining the position of a surveillance camera in accordance with an embodiment of the present invention.

First, images of resolution j are sequentially captured at all possible positions (Z1 to Zq), and images at certain positions are merged to generate a panoramic image (S1).

Next, an initial value of the pixel hormone value pij is set for each pixel of the images S1 to Sq captured at all the positions Z1 to Zq (S2). For example, the pixel hormone value pij of the j-th pixel in the i-th position Zi is set, and the initial value is assigned to pij. At this time, the initial value may be the maximum hormone value (Maxhormone).

After a certain period of time, Dw is subtracted from the pixel hormone value (pij) (pji <- pji -1) (S3). Conversely, when the surveillance camera 100 performs imaging at the i-th position Zi, Dw is added to the pixel hormone value pij (pji <- pji +1) (S4).

When motion is detected in the image, the pixel hormone value pij is adjusted to 0 (S5).

(Hi-1) at the i-1 position and the video hormone value (Hi + 1) at the i + 1 position, which are the left and right positions, (S6).

The moving direction and the moving speed of the current surveillance camera 100 are determined using the difference between the left and right video hormone values (S7).

The embodiments of the present invention described above can be implemented in the form of program instructions that can be executed through various computer components and recorded in a computer-readable recording medium. The computer-readable recording medium may include program commands, data files, data structures, and the like, alone or in combination. The program instructions recorded on the computer-readable recording medium may be those specifically designed and configured for the present invention or may be those known and used by those skilled in the computer software arts. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape, optical recording media such as CD-ROM and DVD, magneto-optical media such as floptical disks, medium, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code, such as those generated by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware device may be modified into one or more software modules for performing the processing according to the present invention, and vice versa.

The use of the terms &quot; above &quot; and similar indication words in the specification of the present invention (particularly in the claims) may refer to both singular and plural. In addition, in the present invention, when a range is described, it includes the invention to which the individual values belonging to the above range are applied (unless there is contradiction thereto), and each individual value constituting the above range is described in the detailed description of the invention The same. Finally, the steps may be performed in any suitable order, unless explicitly stated or contrary to the description of the steps constituting the method according to the invention. The present invention is not necessarily limited to the order of description of the above steps. The use of all examples or exemplary language (e.g., etc.) in this invention is for the purpose of describing the present invention only in detail and is not to be limited by the scope of the claims, It is not. It will also be appreciated by those skilled in the art that various modifications, combinations, and alterations may be made depending on design criteria and factors within the scope of the appended claims or equivalents thereof.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Those skilled in the art will appreciate that various modifications and changes may be made thereto without departing from the scope of the present invention.

Accordingly, the spirit of the present invention should not be construed as being limited to the above-described embodiments, and all ranges that are equivalent to or equivalent to the claims of the present invention as well as the claims .

100: Surveillance camera
200: Network
300: control server

Claims (3)

At least one surveillance camera moving along the movement path and acquiring an image of the surveillance region at a plurality of imaging positions; And
And a control server for determining a moving speed of the surveillance camera based on a video hormone value,
The control server determines a moving direction and a moving speed of the surveillance camera by calculating a video hormone value at a current position of the surveillance camera, a video hormone value at a left position, and a video hormone value at a right position,
Wherein the video hormone value at a specific imaging position is reduced every time a predetermined time elapses and decreases every time a motion is sensed in an image captured at the specific imaging position. The method according to claim 1,
Wherein the video hormone value is decreased by a weight every time a predetermined time passes and is increased by a reference value every time the surveillance camera captures the specific imaging position. The method according to claim 1,
Wherein the image hormone value is calculated by adding a pixel hormone value and the pixel hormone value detected in the image captured at the specific imaging position is set to zero.

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