KR20050011073A - Camera system capable of using one cable line for transporting image signals, supplying power, and controlling camera - Google Patents

Abstract

PURPOSE: A photographing system capable of transmitting video signals, supplying power and controlling image pick-up devices using a single line is provided to reduce line installation cost by providing power to each image pick-up device, transmitting an image captured by each image pick-up device, and delivering a control signal of each image pick-up device using a single cable line. CONSTITUTION: A photographing system includes an image pick-up device(400), a display, and an image pick-up controller(200). The image pick-up device captures an image of an object and outputs a video signal corresponding to the captured image. The display receives the video signal and displays an image corresponding to the video signal. The image pick-up device controller transmits control signals for setting an environment and functions of the image pick-up device to the image pick-up device. The video signal and the control signals are transmitted through a single line.

Description

Camera system capable of using one cable line for transporting image signals, supplying power, and controlling camera}

The present invention relates to a photographing system, and more particularly, to a photographing system for displaying images captured by a photographing apparatus installed at a remote location on a display unit located indoors, by using a single cable line to supply power to each photographing apparatus. The present invention relates to a photographing system for supplying, transmitting an image captured by each photographing apparatus, and transmitting a control signal of each photographing apparatus.

With the development of data transmission technology, it is possible to view images captured and transmitted by a photographing apparatus even at a distance from a place where a photographing apparatus is installed. For example, CCTV cameras are installed in places where security is required from outside or in hot spots, and the monitoring person monitors them through a monitor in the management room, and cameras are installed in a traffic jam area and the road control situation is identified in the central control room. .

1 is a block diagram of a conventional CCTV camera system. CCTV camera system is composed of a TV (10), CCTV camera control unit 20, adapter 30, and CCTV camera 40. In general, the TV 10, the CCTV camera control unit 20, and the adapter 30 is provided indoors, the CCTV camera 40 is installed outdoors or remotely. Thus, cables 51, 53, and 55 are needed to link indoor devices 10, 20, 30 and outdoor CCTV cameras 40.

The video taken by the CCTV camera 40 is transmitted to the TV 10 through the video signal transmission cable 51 in accordance with the NTSC broadcast method. The TV 10 displays a video signal received from the CCTV camera 40 so that the user can view it.

Then, the CCTV camera control unit 20 performs a function of setting and changing the environment (resolution, brightness value, etc.) of the CCTV camera 40. In addition, the CCTV camera control unit 20 also performs a function of controlling the operation of the CCTV camera 40, such as photographing angle, zoom-in / zoom-out of the lens. The CCTV camera control unit 20 transmits a control signal through a control signal transmission cable 53 to control the environment setting and operation of the CCTV camera 40, by RS-232 serial communication.

On the other hand, the adapter 30 converts the power of AC 110 / 220V into a DC 12V power supply to supply to the CCTV camera 40 through the power supply line (55).

As described above, the conventional photographing system includes a video signal transmission cable 51 for transmission of a captured video signal, a control signal transmission cable 53 for transmission of a control signal output from the CCTV camera controller 20, The power supply line 55 for supplying power to the CCTV camera 40 is to be installed separately. If the distance between the place where the CCTV camera 40 is installed and the place where the TV 10, the CCTV camera control unit 20, and the adapter 30 are located is large, the facility costs of the three lines mentioned above are increased. .

In particular, when a video signal is transmitted over a long distance through a coaxial cable mainly used as the video signal transmission cable 51, the attenuation of the video signal is increased, which causes a problem in that the image quality of the image displayed on the TV 10 is degraded.

The present invention has been made to solve the above problems, an object of the present invention, in the photographing system for displaying the image taken by the photographing apparatus installed in a remote location on the display unit located indoors, using one cable line The present invention provides a photographing system that supplies power to each photographing apparatus, transmits images photographed by each photographing apparatus, and transmits control signals of the photographing apparatuses.

1 is a block diagram of a conventional CCTV camera system,

2 is a block diagram of a photographing system capable of transmitting a video signal, supplying power, and controlling a CCTV camera using a single cable according to an embodiment of the present invention; and

3A and 3B are diagrams provided to explain the DiSEqC method.

Explanation of symbols on the main parts of the drawings

100: TV 110: tuner

120: demodulation unit 130: screen display unit

200: CCTV camera control unit 250: user interface unit

300: adapter 400: CCTV camera

410: input and output terminal 420: modulator

430: signal separation unit 440: recording unit

500: coaxial cable

According to the present invention for achieving the above object, a photographing system for photographing a subject and outputs an image signal, a display unit for receiving the image signal to display a corresponding image, and the environment setting and function of the photographing apparatus And a photographing apparatus controller for transmitting a control signal for setting to the photographing apparatus, wherein the image signal and the control signal are transmitted through one line. The apparatus may further include a power supply unit for supplying power to the photographing apparatus, wherein the power may be supplied through the one line.

The photographing apparatus may further include: a photographing unit for outputting the video signal, a modulator for modulating and outputting the video signal, and a signal for separating the control signal and power received through the one line and outputting the signal to the photographing unit. It may include a separator. In addition, the photographing apparatus may be a CCTV camera.

The photographing system may include at least one photographing apparatus. The display unit may further include a tuner that tunes and outputs any one of modulated video signals received from the at least one photographing apparatus through the one line, and demodulates and outputs a modulated video signal received from the tuner. And a screen display unit for displaying an image corresponding to the demodulated video signal received from the demodulator. In addition, the display unit may be a TV.

The control signal may include address information corresponding to the at least one photographing apparatus, and the at least one photographing apparatus may determine whether to receive the control signal with reference to the address information. The control signal may be a digital satellite equipment control (DiSEqC) signal.

Hereinafter, with reference to the drawings will be described the present invention in more detail.

2 is a block diagram of a photographing system capable of transmitting a video signal, supplying power, and controlling a CCTV camera using a single cable according to an embodiment of the present invention. Referring to FIG. 2, the photographing system includes a TV 100, a CCTV camera control unit 200, a user interface unit 250, an adapter 300, a plurality of CCTV cameras 400, 400-2 to 400-n, and one. The coaxial cable 500 is composed of.

The plurality of CCTV cameras 400 and 400-2 to 400-n may be installed in different areas, respectively, and transmit images to the TV 100 by photographing a designated shooting area.

The CCTV camera 400 includes an input / output terminal 410, a modulator 420, a signal separator 430, and a photographing unit 440. The photographing unit 440 photoelectrically converts the optical image incident through the lens, generates an image signal through a signal processing process, and transmits the generated image signal to the modulator 420. The modulator 420 modulates an image signal received from the photographing unit 440 into a signal of a radio frequency band and outputs the signal to the input / output terminal 410. The RF signal outputted to the input / output terminal 410 is transmitted to the TV 100 through the coaxial cable 500. Since the configuration of the second to n-th CCTV cameras 400-2 to 400-n is the same as that of the CCTV camera 400, a description thereof will be omitted. In addition, the plurality of CCTV cameras 400 and 400-2 to 400-n should use different frequency bands.

The TV 100 includes a tuner 110, a demodulator 120, and a screen display unit 130. The tuner 110 selects one of RF signals of different frequency bands received from the plurality of CCTV cameras 400 and 400-2 to 400-n, and then down-converts to baseband. Output to the demodulator 120. The demodulator 120 demodulates and outputs a signal received from the tuner 110. The screen display unit 130 receives an image signal which is a demodulated signal from the demodulator 120 and displays an image corresponding thereto.

On the other hand, the user may input a configuration and function setting command for each of the plurality of CCTV cameras 400, 400-2 to 400-n through the user interface 250. The environment setting and function setting command signals output from the user interface unit 250 are encoded and output as control signals from the CCTV camera controller 200. The CCTV camera controller 200 controls the operations of the plurality of CCTV cameras 400, 400-2 to 400-n according to the DiSEqC method.

DiSEqC (Digital Satellite Equipment Control) was developed in Europe for the purpose of controlling the external outdoor devices of satellite receivers.The Pulse Width Modulation (PWM) and Amplitude Shfting Keying methods for 22kHz oscillation signals Generates a bit signal using ASK). 3A shows a low bit ('0') and high bit ('1') signal used in the DiSEqC method. In the DiSEqC method, 8 bits constitute one significant byte, and odd parity bits are added to each valid byte to detect an error.

3B is a diagram illustrating a frame structure of a DiSEqC signal. In the case of using the DiSEqC signal as a control signal, the address ADDRESS byte becomes the address information of the photographing apparatus to which the control signal is to be transmitted, and the command byte becomes information regarding the environment setting and the function setting of the photographing apparatus.

Therefore, if the user commanded to rotate the photographing angle of the CCTV camera 400 by 90 degrees in the clockwise direction through the user interface 250, the CCTV camera controller 200 generates a control signal corresponding to the command to coaxial The cable 500 transmits the plurality of CCTV cameras 400 and 400-2 to 400-n. The plurality of CCTV cameras 400, 400-2 to 400-n determine whether to receive the control signal with reference to the address byte of the control signal. In this example, only the CCTV camera 400 responds to the control signal. The control signal input through the input / output terminal 410 of the CCTV camera 400 is transmitted to the signal separator 430. In the photographing system, since the control signal and the power are transmitted through one coaxial cable 500, the signal separator 430 is also input with power in addition to the control signal. Therefore, the signal separator 430 separates the control signal and the power output from the input / output terminal 410, respectively, and supplies power to the photographing unit 440 and transmits the control signal. The photographing unit 440 receiving the control signal from the signal separating unit 430 operates according to the control signal. In the above example, when the photographing unit 440 receives the control signal, the camera lens unit rotates by 90 degrees clockwise. Let's go.

Meanwhile, the adapter 300 converts the AC 110 / 220V into DC 12V, which is a voltage available from the plurality of CCTV cameras 400 and 400-2 to 400-n, and supplies the same to each CCTV camera through the coaxial cable 500. . DC 12V power supplied to the CCTV camera 400 is transmitted to the signal separation unit 430 through the input and output terminal 410, is separated from the control signal in the signal separation unit 430 is applied to the photographing unit 440. .

As described above, according to the present invention, when the DiSEqC method is applied to a photographing system in which a photographing apparatus installed at a remote location displays a photographed image on a display unit located indoors, power is supplied to each photographing apparatus and photographed. A path for transmitting the image captured by the device and transmitting a control signal of each photographing device may be formed by one cable line, thereby reducing the equipment cost of the line. In addition, since the captured image is transmitted as a signal of the RF band, the attenuation is small even when transmitted over a long distance through a coaxial cable, so that the image quality of the transmitted image is good.

In addition, although the preferred embodiment of the present invention has been shown and described above, the present invention is not limited to the specific embodiments described above, but the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

Claims (9)

A photographing apparatus for photographing a subject and outputting an image signal; A display unit configured to receive the video signal and display a corresponding video; And And a photographing device control unit which transmits a control signal for setting an environment and a function of the photographing device to the photographing device. And the video signal and the control signal are transmitted through one line. The method of claim 1, And a power supply unit for supplying power to the photographing apparatus. And the power is supplied through the one line. The method according to claim 1 or 2, The photographing apparatus, A photographing unit which outputs the video signal; A modulator for modulating and outputting the video signal; And And a signal separation unit for separating the control signal and the power received through the one line and outputting the power to the imaging unit. The method of claim 3, wherein The photographing apparatus is a photographing system, characterized in that the CCTV camera. The method of claim 3, wherein And at least one imaging device. The method of claim 5, The display unit, A tuner which selects and outputs any one of modulated video signals received from the at least one photographing apparatus through the one line; A demodulator for demodulating and outputting the modulated video signal received from the tuner; And And a screen display unit which displays an image corresponding to the demodulated image signal received from the demodulator. The method of claim 6, And the display unit is a TV. The method of claim 5, The control signal includes address information corresponding to the at least one photographing apparatus, And the at least one photographing apparatus determines whether to receive the control signal with reference to the address information. The method of claim 8, The control signal is a DiSEqC (Digital Satellite Equipment Control) signal, characterized in that the system.