KR100775814B1 - A wireless cctv transmitter - Google Patents

Abstract

A wireless CCTV(Closed Circuit TV) transmission apparatus is provided to separate a control signal loaded on an AC signal and transmitted and use the separated control signal as a power signal of a motor for adjusting an angle of an image pickup unit. A local control unit(40) includes a signal separating unit(41), a power transform unit(43), a signal analyzing unit(45), and a motor driving unit(47). The signal separating unit(41) separates a wireless signal, an AC signal, and a control signal. The power transform unit(43) transforms the AC signal separated in the signal separating unit(41) into DC power. The signal analyzing unit(45) analyzes the control signal separated in the signal separating unit(41) to determine a rotary direction and a rotary angle of an image pickup unit. The motor driving unit(47) drives a motor(50) according to the rotary direction and the rotary angle of the image pickup unit determined in the signal analyzing unit(45). The signal analyzing unit(45), the motor driving unit(47), and the motor(50) are driven by the DC power supplied from the power transform unit(43).

Description

Wireless CCTV Transmitter {A Wireless CCTV Transmitter}

The present invention relates to a wireless CCTV transmission apparatus, and more particularly, by separating the control signal carried on the AC signal and using the AC signal as a power signal of the motor for adjusting the angle of the imaging unit to minimize the power consumption for driving the motor. In addition, the present invention relates to a wireless CCTV transmitter for increasing the use time of a storage device by calculating a change rate of an image to be captured and changing a storage period of the image data according to the change rate.

CCTV (Closed Circuit Tele-Vision) system is to monitor video and audio from remote sites. CCTV transmitter for capturing and transmitting video and central monitoring device for outputting the received video to monitor or storage. It consists of.

In the conventional CCTV transmitter and the central monitoring device, the video data recorded by the cable is transmitted to the central monitoring device, but the construction cost of the line increases and the location where the construction of the track is difficult or frequently moves the CCTV transmitter is required. Has disadvantages.

Accordingly, in recent years, a case in which a wireless CCTV system in which a CCTV transmitter and a central monitoring unit are coupled to a wireless communication network is increasing, and relates to such a wireless CCTV system of the present invention.

The wireless CCTV transmitter receives a control signal for controlling the imaging angle from the central monitoring device through a wireless communication network and drives the motor according to the received control signal to control the imaging angle of the camera. There is an increasing disadvantage.

On the other hand, the central monitoring device is provided with a VCR for storing the video data transmitted from the wireless CCTV transmitter. Video data storage methods using a VCR include a standard method of continuously storing image data and a time lapse method of storing image data at a predetermined time interval.

While the standard method has a disadvantage in that a large amount of video data is stored, a storage space of a storage device must be secured, while the time lapse method has an advantage of reducing the amount of video data stored, but often misses an important surveillance scene. There is a problem.

The present invention has been made to solve the above problems, and an object of the present invention is to separate the control signal transmitted to the AC signal and use the AC signal as a power signal of the motor for adjusting the angle of the imaging unit to drive the motor. It is to provide a wireless CCTV transmission device that can minimize the power consumption for.

Another object of the present invention is to provide a stable and high-quality power by removing the ripple of the converted DC power supply by providing a ripple removal unit in the signal separation unit for separating the wireless signal into an AC signal and a control signal.

In addition, another object of the present invention is to calculate the rate of change of the image to be captured to vary the storage period of the image data according to the rate of change to significantly increase the use time of the storage device.

According to an aspect of the present invention for achieving the above object, an image pickup unit for photographing a peripheral image, an image processing unit for converting the electrical signal received from the image pickup unit, the image data to the central monitoring device A wireless transmission / reception unit for transmitting and receiving a control signal mixed with an AC signal from the central monitoring apparatus, a power supply unit supplying power to the imaging unit, an image processing unit and a wireless transmission / reception unit, and a control signal received through the wireless transmission / reception unit A local control unit for outputting a motor driving signal corresponding to the motor and a motor for controlling the imaging angle of the imaging unit by operating in accordance with the motor driving signal, wherein the local control unit separates the wireless signal from an AC signal and a control signal. Separator, a power converter for converting the AC signal separated in the signal separation unit into direct current power, A motor for driving the motor according to the rotation direction and the rotation angle of the signal analysis unit and the image analysis unit derived from the signal analysis unit to derive the rotation direction and the rotation angle of the image pickup unit by analyzing the control signal separated by the signal separation unit Including a drive unit, there is provided a wireless CCTV transmitter characterized in that the signal analysis unit, the motor drive unit and the motor is driven by the DC power supplied from the power converter.

The signal separation unit may include a low pass filter for filtering only an AC signal from the wireless signal, and a high pass filter for filtering only a control signal from the wireless signal; And a ripple removing unit for removing the ripple of the DC voltage output from the power converter.

The image processor may further include an image converter converting an electrical signal output from the imager into image data, a temporary storage unit temporarily storing the converted image data, and a rate of change between a current frame and a previous frame of the converted image data. More preferably, a change rate calculation unit for calculating a and a storage control unit for controlling the storage period of the image signal stored in the temporary storage unit based on the calculated change rate.

In addition, the change rate may be calculated as m / n when a frame of an image is divided into n regions, and the number of regions not equal to the previous frame in each region is m.

According to the present invention as described above, it is possible to minimize the power consumption for driving the motor by separating the control signal carried on the AC signal and using the AC signal as a power signal of the motor for adjusting the angle of the imaging unit.

In addition, the ripple removal unit is provided in the signal separation unit that separates the wireless signal into an AC signal and a control signal, thereby removing the ripple of the converted DC power supply, thereby providing stable and high-quality power.

In addition, it is possible to maximize the storage efficiency of the storage device by reducing the amount of image data stored by calculating a change rate of the image to be captured and changing the storage period of the image data according to the change rate.

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

1 is a block diagram showing the configuration of a wireless CCTV monitoring system according to the present invention.

As shown in FIG. 1, the wireless CCTV surveillance system according to the present invention takes images from a wireless CCTV transmitter 1 and a wireless CCTV transmitter 1 for photographing and transmitting surrounding images to a central monitoring apparatus 2. And a central monitoring device 2 for monitoring and storing data.

The central monitoring unit 2 transmits a control signal for controlling the imaging direction to the wireless CCTV transmitter 1 for remote control, and the imaging unit 10 rotates according to the control signal. To capture an image within the imaging range.

The wireless CCTV transmitter 1 includes an image capturing unit 10 for capturing surrounding images, an image processing unit 20 for converting electrical signals received from the image capturing unit 10 into image data, and a central monitoring apparatus ( 2) a radio transceiver 30, an imaging unit 10, an image processor 20, and a radio transceiver 30 that receive a radio signal in which control signals are mixed with AC signals from the central monitoring apparatus 2; A power supply unit 60 for supplying power to the local control unit, a local control unit 40 for outputting a motor driving signal corresponding to a control signal received through the wireless transmission / reception unit 30, and an operation of the imaging unit 10. It is comprised including the motor 50 which controls an imaging angle.

In the present invention, the power for the image capture, image data conversion, data transmission and reception is supplied from the power supply unit 60, the power for the operation of the local control unit 40 and the motor 50 is not supplied from the power supply unit 60, the central monitoring It is characterized by minimizing power consumption by separating only the AC signal from the wireless signal received by the device 2 and using it as a power source.

The configuration and operation for this will be described in detail with reference to FIGS. 2 and 3.

FIG. 2 is a block diagram illustrating a detailed configuration of a local controller in FIG. 1, and FIG. 3 is a block diagram illustrating a detailed configuration of a signal separation unit of FIG. 2.

As illustrated in FIG. 2, the local controller 40 includes a signal separator 41, a power converter 43, a signal analyzer 45, and a motor driver 47.

The signal separator 41 separates the wireless signal received from the central monitoring apparatus 2 through the wireless transceiver 30 into an AC signal and a control signal. According to the present invention, a control signal for controlling the imaging angle of the imaging unit 10 is generated as a high frequency signal, and the high frequency control signal is loaded on an AC signal having a carrier band frequency.

As shown in FIG. 3, the signal separator 41 may include a low pass filter 411 for filtering only an AC signal from a wireless signal, a high pass filter 413 for filtering only a control signal from a wireless signal, and a power converter to be described later. It comprises a ripple removing unit 415 for removing the ripple of the DC voltage output from (43).

As described above, the wireless signal is a high-frequency control signal modulated to an AC signal having a carrier band frequency, so that the low-pass filter 411 removes the high-frequency control signal and then applies it to the power converter 43. In the high pass filter 413, an AC signal having a carrier band frequency having a relatively low frequency is removed and then applied to the signal analyzer 45.

The ripple remover 415 removes the ripple of the DC voltage output from the power converter 43 to be described later to provide stable and high-quality DC power to the signal analyzer 45, the motor driver 47, and the motor 50. Supply.

The power converter 43 is a part that converts an AC signal separated by the signal separation unit 41 into a DC signal to supply DC power, and converting an AC signal into DC power is known in the art, so The description will be omitted.

The signal analyzer 45 analyzes the control signal separated by the signal separator 41 to derive the rotation direction and the rotation angle of the imaging unit 10. The control signal includes position coordinates or rotation direction and rotation angle information to be moved by the imaging unit 10. The signal analyzer 45 compares the current position coordinates with the position coordinates to be moved when the position coordinates to be received are received. Calculate the rotation direction and the rotation angle of (10), and when the control signal includes the rotation direction and the rotation angle information, extracts the rotation direction information and rotation angle information from the control signal, and generates a drive control signal corresponding to the motor Transfer to the drive 47.

The motor driver 47 drives the motor 50 according to the drive control signal received from the signal analyzer 45 to rotate the imaging unit 10 to a set position.

The DC power generated by the power converter 43 is converted into a stable and high-quality DC signal through the ripple removing unit 415 in the signal separator 41, and then the signal analyzer 45, the motor driver 47, and the like. By being supplied to the motor 50 to drive each component, there is no power consumption associated with driving the motor 50, thereby significantly reducing the power consumption.

FIG. 4 is a block diagram illustrating a detailed configuration of an image processor of FIG. 1, and FIG. 5 illustrates a principle of calculating a change rate of image data.

As shown in FIG. 4, the image processor 20 may include an image converter 21 for converting an electrical signal output from the imager 10 into image data, and a temporary storage unit 27 for temporarily storing the converted image data. ), A change rate calculator 23 that calculates a change rate between the current frame and the previous frame of the converted image data, and a storage controller that controls a storage period of the image data stored in the temporary storage unit 27 based on the calculated change rate. And an encoder 29 for encoding the image data stored in the temporary storage unit 27. The encoded image data is transmitted to the central monitoring apparatus 2 through the wireless transmission / reception unit 30.

The rate of change between each frame can be calculated in several ways. In FIG. 5, as an example, one frame is divided into n areas, and every frame is divided into areas that are not identical to and not identical to each other in comparison with the previous frame. When m is the number of regions that are not, m / n may be determined as the rate of change.

The storage control unit 25 controls the storage period to vary according to the change rate, and the storage period 25 is preferably shortened as the change rate increases. For example, when the change rate is 0.9 or more, the image storage unit 10 is stored at each imaging cycle, and in the case of 0.8 to 0.9, twice the imaging cycle, 4 to 0.7 to 0.8, and 8 to 0.6 to 0.7 16 times in the case of 0.5 to 0.6, and 32 times in the case of 0.5 or less, the image data can be stored in the temporary storage unit 27.

Therefore, the central monitoring apparatus 2 receives the image data whose storage period is changed according to the calculated change rate and stores the image data in the VCR. When the average change rate of the captured image is approximately 0.75, the received image data is continuous. Compared with the stored image data, the required storage space is reduced to about one quarter, thereby significantly increasing the storage efficiency.

Although the temporary storage unit 27 temporarily stores the image data converted by the image converting unit 21, it is also possible to immediately store the raw data captured by the image capturing unit 10.

1 is a block diagram showing the configuration of a wireless CCTV monitoring system according to the present invention.

FIG. 2 is a block diagram illustrating a detailed configuration of the local controller in FIG. 1.

3 is a block diagram illustrating a detailed configuration of the signal separation unit of FIG. 2.

4 is a block diagram illustrating a detailed configuration of an image processor of FIG. 1.

5 is for explaining the principle of calculating the rate of change of the image data.

<Description of main drawing code>

1: Wireless CCTV transmission device 2: Central monitoring device

10: imaging unit 20: image processing unit

21: image converter 23: change rate calculator

25: storage control unit 27: temporary storage unit

29: encoder 30: wireless transceiver

40: local control unit 41: signal separation unit

43: power conversion unit 45: signal analysis unit

47: motor drive part 411: low pass filter

413: high pass filter 415: ripple removing unit

50: motor

Claims (4)

In the wireless CCTV transmission device for transmitting the image captured by the central monitoring device and a wireless communication network coupled to the central monitoring device, An imaging unit for photographing a surrounding image; An image processor converting the electrical signal received from the imager into image data; A wireless transmission / reception unit for transmitting the image data to the central monitoring apparatus and receiving a wireless signal mixed with an AC signal from the central monitoring apparatus; A power supply unit supplying power to the imaging unit, the image processing unit, and a wireless transceiver; A local controller for outputting a motor driving signal corresponding to the control signal received through the wireless transceiver; And It includes a motor for operating in accordance with the motor drive signal to control the imaging angle of the imaging unit, The local controller analyzes the control signal separated from the signal separation unit, a signal separation unit for separating the AC signal and the control signal, a power conversion unit for converting the AC signal separated in the signal separation unit into direct current power; And a motor driver configured to drive the motor according to the rotation direction and the rotation angle of the imaging unit derived from the signal analyzer and a signal analyzer to derive the rotation direction and the rotation angle of the imaging unit. Wireless CCTV transmitter, characterized in that the signal analysis unit, the motor drive unit and the motor is driven by a DC power. The method of claim 1, The signal separation unit A low pass filter for filtering only an AC signal from the wireless signal; A high pass filter for filtering only control signals from the wireless signal; And And a ripple removing unit for removing the ripple of the DC voltage output from the power converter. delete delete

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