KR20050006991A - Image scattering prevention apparatus and method in the CC-TV system - Google Patents

Abstract

PURPOSE: An apparatus and a method for preventing image tremble in a CC-TV system to prevent an image tremble phenomenon in case of channel change by enabling each camera to display a pickup image in response to a vertical synchronizing signal transmitted from a video display unit. CONSTITUTION: A synchronizing signal generation part(160) receives AC(Alternating Current) sign wave from the outside and thereby generates a vertical synchronizing signal. A control part(130) transfers the vertical synchronizing signal to an image pickup device. A camera signal input part(120) applies video information picked up in tune with the vertical synchronizing signal to the control part. A video signal process part(140) converts the video information from the control part into an output signal. The control part transmits the vertical synchronizing signal to the camera signal input part.

Description

Image stabilization prevention apparatus and method in the CC-TV system {the image scattering prevention apparatus and method in the CC-TV system}

The present invention relates to a screen shake prevention device and method for preventing a shaking phenomenon from occurring when switching channels in displaying image information captured by one or more cameras in a CC-TV system on a monitor.

As society grows in size, safety concerns have increased, and many years ago, large-scale buildings as well as private homes have been installing and using security systems using CC-TV. In the case of a large building, a complex system that displays information captured by several cameras on the same number of monitors may be used.However, due to management difficulties and economic burdens, a large number of cameras are generally used to photograph the surroundings of a building. A system managed by one monitor is generally used.

A typical CC-TV system using one monitor can be implemented in various ways depending on the number of cameras installed.

In other words, if two or three cameras are installed, an autoselector is used to periodically change the channel without dividing the screen. In case of more than 4 units, it can be implemented by dividing the monitor into 4 screens by using quad (4 screen divider) and changing the channel periodically. For example, if 8 cameras are connected, the quad is used to divide the monitor into 4 screens, and then fixed output is output on one screen for important places, and the camera is automatically used by using the auto selector on the remaining 3 screens. By changing the, the screen can be implemented to change. In addition, the user may selectively change the channel by selecting a camera number.

In FIG. 1, a configuration of a general CC-TV system is shown in a simple block diagram. According to the figure, the plurality of cameras 10a to 10n are connected to the image display apparatus by wire / wireless.

In the case of the CC-TV is usually used for a limited purpose, because of the wired, in the case of the radio, the radio frequency allocation is limited to a specific purpose. In the case of wired transmission, base band transmission for transmitting an image signal as it is is common. Carrier transmission, PCM transmission, optical communication transmission, and the like, which modulate the video signal and carry it on a carrier, are used. Hereinafter, the wired CC-TV system will be described as an example.

The cameras 10a to 10n and the image display device are connected through a camera signal input unit 20. The camera signal input unit 20 is an interface for performing an interface with the cameras 10a to 10n through an RJ45 or an RJ-45 jack installed at a cable end, and the image information captured by the cameras 10a to 10n. To the video display device, and transmits a control signal from the video display device to the camera.

The image display apparatus includes a controller 30 that controls the entire image display apparatus, an image signal processor 40 that is controlled by the controller 30 to convert input image information into an output signal, and displays the output signal on the screen. It may be configured to include a CRT (50).

When the connected cameras 10a to 10n respectively transmit the captured image information, they are received through the camera signal input unit 20 and converted into a signal that can be output from the image signal processor 40. The control unit 30 outputs the output signal converted using the auto selector and quad in the form of a screen division, channel distribution, etc. in the CRT.

On the other hand, while a general TV can output video information input from a broadcasting station according to a synchronization signal of the TV itself, a CC-TV system is connected to a plurality of cameras so that information captured by each camera can be displayed on one monitor. Since it is common to express a plurality of screens, it is difficult to output the signals photographed by each camera according to its own vertical synchronization signal individually to the synchronization signal of the TV itself.

Therefore, when the channel is changed, when the vertical synchronization signal of the image display apparatus and the vertical synchronization signal of the camera do not coincide with each other, the screen may shake for a while. If the frequency is changed to such an extent that it is out of the frequency error range of the synchronization signal of the image display itself, the screen continues to shake and normal monitoring and observation is impossible.

According to the present invention, the image display device transmits its own vertical synchronization signal to the connected cameras, so that each camera displays information captured in accordance with the synchronization signal on the image display device, thereby preventing screen shaking during channel conversion. The purpose.

1 is a simple block diagram of the configuration of a conventional CC-TV system,

2 is a simple block diagram of the configuration of a CC-TV system according to the present invention;

3 is a simple block diagram showing an embodiment of one element of the CC-TV system of the present invention;

4 is a flowchart illustrating a screen shake prevention method according to the present invention.

The apparatus for preventing image stabilization of a CC-TV system according to the present invention includes a sync signal generator for receiving an AC sine wave and generating a sync signal, a controller for transmitting the sync signal generated by the sync signal generator to the imaging device, A camera signal input unit for applying the image information captured by the image capturing device to the control unit to the control unit, an image signal processing unit for converting the image information applied to the control unit into an output signal, and an output converted by the image signal processing unit And a CRT for displaying the signal. As the image pickup device, a CC-TV camera may be typically used.

On the other hand, according to an embodiment of the present invention, the synchronization signal generation unit, an AC half-wave detection unit for receiving an AC sine wave to detect the AC half-wave, a photo coupler for transforming the AC half-wave to a predetermined size and pulses the transformed AC half-wave And a pulse waveform generator for converting the waveform to a waveform.

In addition, the method of preventing the screen shake of the CC-TV system according to the present invention, the step of receiving an AC sine wave to detect a half wave, converting the AC half-wave to a voltage of a predetermined size, the AC half-wave of the predetermined size Converting the pulse waveform synchronization signal to at least one or more cameras connected via wired / wireless connection, and imaging the pulse waveform synchronization signal by synchronizing with the pulse waveform synchronization signal. Receiving image information at a camera signal input unit, converting the received image information into an output signal, and displaying the output signal on a screen.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the screen shake prevention apparatus and method according to the present invention.

2 is a block diagram illustrating a configuration of an apparatus for preventing screen shake in a CC-TV system according to the present invention. In the drawing, the plurality of cameras 110a to 110n is connected to the image display apparatus 200 through the camera signal input unit 120. In the drawing, although the cameras 110a to 110n are shown as an example, other imaging apparatuses that capture images according to synchronization signals other than the cameras 110a to 110n may also be used in the present system. Hereinafter, a description will be given collectively as a camera.

The image display apparatus 200 includes a synchronization signal generator 160. The synchronization signal generator 160 generates a synchronization signal and then connects the cameras 110a to 110n connected to the image display apparatus 200. FIG. ) Means for synchronizing the synchronization signal timing, i.e., tuning.

As an example, FIG. 3 illustrates a configuration of the synchronization signal generator 160.

The synchronization signal generator 160 shown in FIG. 3 receives the AC sine wave voltage and converts it into a pulse waveform, and then controls the controller 130 to be used as a synchronization signal in a plurality of connected cameras 110a to 110n. It serves to transmit to the camera (110a ~ 110n) through.

In view of the action, the AC sine wave voltage is first applied from the AC power source, the AC half wave detection unit 163 detects the AC half wave, and the photo coupler 162 converts the voltage into an appropriate magnitude. The AC half wave detector 163 may use a conventional half wave rectifier. The photo coupler 320 is an optical coupling device in which a light emitting device and a light receiving device are combined to form a single device, whereby an input side and an output side are electrically insulated and a signal by light is transmitted. This characteristic can be used for signal transmission between circuits having different potentials, noise blocking, and the like. In the present embodiment, the AC half wave detected from an AC sine wave applied from an external power source is used to deliver the AC half wave to the image display apparatus 200. . The photo coupler 162 may use an existing product.

On the other hand, the pulse waveform generating unit 161, the slicing the transformed AC half-wave (slicing) is converted into a pulse waveform and transmitted to the controller 130.

The pulse wave generated by the sync signal generator is transmitted to the controller 130, and is then transmitted to at least one or more cameras 110a to 110n connected by wire / wireless through the camera signal input unit 120. The controller 130 may be implemented to include a multiplexer to multiplex transmission of imaging information from a plurality of cameras and pulse waves generated by the synchronization signal generator.

On the other hand, the camera (110a ~ 110n) is able to capture the image by matching the timing of the transmitted pulse waveform and the synchronization signal of the camera itself.

When the camera 110a to 110n transmits the captured image information to the image display apparatus 200 again, the camera signal input unit 120 extracts the image information from the transmission data and transmits the image information to the controller 130. The controller 130 converts the transmitted image information into a form that can be output through the image signal processor 140 and then outputs the image information through the CRT 150. On the other hand, in the figure shows a configuration for outputting using the CRT 150, the CC-TV system of the present invention may be implemented using an output device other than the CRT (150).

On the other hand, Figure 4 is a flow chart showing the operation of the screen shake prevention apparatus according to the present invention. According to the drawing, when the image display apparatus 200 is connected to a power source and an AC sine wave voltage is applied, the AC half wave detection unit 163 detects an AC half wave (S410). The AC half-wave detection unit 163 may be generally implemented using a diode.

Next, after the photo coupler 162 transforms the voltage to an appropriate size, the pulse waveform generator 161 slices the transformed voltage into a pulse waveform (S420).

The pulse waveform is transmitted to the controller 130 to be transmitted to the camera (110a ~ 110n) as a vertical synchronization signal (S430). The cameras 110a to 110n synchronize a vertical synchronization signal of the camera itself with the transmitted vertical synchronization signal (S440), and transmit the captured image information to the camera signal input unit 120 again to display the image display apparatus 200. ) Will output this on the monitor. Since the image information is captured in accordance with the vertical synchronization signal of the image display apparatus itself, the shaking of the screen may be prevented during channel conversion.

The foregoing detailed description of the invention has been presented for purposes of illustration and description, and is not intended to limit the invention thereto. In view of the above description, those skilled in the art can make improvements and modifications without departing from the spirit and scope of the present invention.

According to the present invention, the image display apparatus generates its own synchronization signal using the AC sine wave applied from an external power source, so that the camera captures the image using the same, and thus the synchronization signal between the camera and the image display apparatus can be matched. Therefore, in the existing CC-TV system, when the channel is changed to output image information captured by a plurality of cameras on the screen, the user is prevented from squeezing the screen caused by the mismatch of the synchronization signals. It is possible to provide better image quality.

Claims (6)

In the at least one image pickup device and the image display device connected to the wire / wireless screen shake prevention device of the CC-TV system, A synchronization signal generator for receiving an AC sine wave from an external power source and generating a vertical synchronization signal; A controller which transmits the vertical synchronization signal generated by the synchronization signal generator to the imaging device; A camera signal input unit configured to apply image information captured by the image pickup device to the control unit in synchronization with the transmitted vertical synchronization signal; and And an image signal processor converting the image information applied to the controller into an output signal. And the control unit transmits the vertical synchronization signal to the imaging device through the camera signal input unit. The method of claim 1, And a CRT for displaying the output signal converted by the image signal processing unit. The method according to claim 1 or 2, The sync signal generator, An AC half wave detector for detecting an AC half wave from the AC sine wave; A photo coupler for converting the AC half wave into an AC half wave of a predetermined size used in the image display apparatus; And And converting the transformed AC half-wave into a pulse waveform and transmitting the pulse waveform to a control unit. And wherein the pulse waveform is used as a vertical synchronization signal of the image display device. In the at least one imaging device and the image display device connected to the wired / wireless screen shake prevention method of the CC-TV system, Receiving an AC sine wave from an external power source and converting the AC sine wave into a vertical synchronization signal of the image display device; Transmitting the vertical synchronization signal to the at least one imaging device; Imaging by synchronous with the at least one imaging device the vertical synchronization signal; and And transmitting the captured image information to the image display device and outputting the image information. The method of claim 4, wherein The outputting from the image display apparatus may include Converting the received image information into an output signal; and And displaying the output signal on a screen. The method according to claim 4 or 5, Converting to the vertical synchronization signal, Detecting an AC half wave by receiving an AC sine waveform from an external power source; Converting the AC half wave into an AC half wave of a predetermined size used in the image display apparatus; and And slicing the converted AC half-wave of a predetermined size into a pulse waveform. 2.