KR101817478B1 - Long distance transmission system for multi-channel high quality mulimedia image data - Google Patents

Abstract

The present invention relates to a long distance transmission system for multi-channel high definition (HD) image data through high definition image interpolation. The long distance transmission system for multi-channel HD image data according to the present invention provides a clear image for a user by transmitting low loss HD image data to a receiving terminal even in long distance transmission by mutual loss compensating image interpolation and time delay correction of the HD image data transmitted by using wireless transmission together with a conventional wired UTP cable.

Description

[0001] The present invention relates to a long-distance transmission system for multi-channel high-

The present invention relates to a long-distance transmission system for multi-channel high-definition image data for CCTV, and more particularly, to a long-distance transmission system for multi-channel high- Channel high-definition video data, which can be transmitted over a distance of 1 km or more by using a cable of the CCTV system.

Recently, the demand for CCTV security system for disaster monitoring, traffic monitoring, elderly people and child monitoring is continuously increasing.

 The core technologies of CCTV transmission system are categorized as camera, image storage, image transmission and control system construction. Among these, the most important purpose is to send the camera image obtained by using the minimum line to the long distance at a high speed without loss.

In general, the CCTV video transmission system is installed by a plurality of CCTV cameras, and is managed by a control or integrated control unit. Since a signal system such as image transmission and camera adjustment is required for systematically managing and controlling the CCTV cameras, bidirectional communication is possible The network is organized and systemized.

However, when CCTV is installed outdoors in the transmission of high quality video images, the distance to the control system is increased and the exposure to noise factors increases.

Also, in the above video transmission, it is possible to connect with a BNC or UTP cable within about 1 km, but optical communication technology has to be essentially used. The optical communication technology used in the CCTV transmission system is a key technology for converting a video signal into an optical signal, an optical signal protocol technology, and a multiplexing technique for transmitting and receiving various signals on one line.

Recently, it has been reported that the optical communication technology can be used in a lossless mode with a distance of 12 km or more at a transmission rate of 100 Mbit / s per channel to 20 or more channels. However, in the case of actual HD CCTV, Due to the significantly higher data size, it is a reality that there are limitations in network transmission and data processing in the server. In other words, since only a fixed size image can be transmitted in the HD level video signal captured by the HD CCTV, when the high resolution video is transmitted, the network traffic becomes too high and the resolution too low There is a disadvantage in that a lower quality image must be seen at the receiving end instead of the traffic being reduced.

In addition, the optical communication transmission line has a disadvantage that it is very weak when the installation direction is a straight line as well as a curved path as in the case of the path movement due to the embedding of the optical cable in the straight line. In addition, there is a problem that the optical communication transmission buried in the above is too high in the components and the installation cost, and the conventional transmission facilities must be removed and newly constructed.

Japanese Patent Application Laid-Open No. 10-2013-0077523 Japanese Patent Application Laid-Open No. 10-2013-0067665

SUMMARY OF THE INVENTION It is an object of the present invention to provide a long distance transmission system for video data capable of transmitting high-quality video data to a user while reducing the loss of high-quality video data to a receiving end output unit.

The problems to be solved by the present invention are not limited to the above-mentioned problems. Other technical subjects not mentioned will be apparent to those skilled in the art from the following description.

The long-distance transmission system for multi-channel high-definition image data for CCTV according to the present invention receives a plurality of digital high-definition image signals captured by a plurality of HD cameras 10, converts them into a plurality of analog image signals, And an HD junction box (HDCP) 20 for serial-transmitting the plurality of analog video signals in accordance with a change in time through a one-line coaxial cable (UTP cable) connection to a video signal generated by modulating a plurality of analog video signals A video signal receiver (40) for demodulating the video signal and extracting a plurality of analog video signals; An HD RX 50 for converting the extracted analog signal into a digital high definition image signal, a first image processing unit 60 for performing image processing, and a second image processing unit 60 for detecting different high quality image signals, A DVR 80 for storing the converted digital high definition video signal, and an output unit 90 for reproducing a digital high definition video signal, and the HD junction box 30, The HD RX 50 is provided with a second image receiving unit and the second image transmitting unit is wirelessly connected to a second image receiving unit via a hub, The junction box 30 performs a coding process according to preset signal data for each HD camera, and the signal data is a time slot, a time slot period, and a coding scheme, and the different high- 2 image transmission. The first image transmission is image transmission through the HD junction box 30, the image signal receiver 40 and the HD RX 50. The second image transmission is performed through the second image transmitter 100, (HUB), and a second image receiving unit 110, respectively.

The first image processing unit includes a multiplexer, a first image processing processor, a scaler, and a first image detecting unit. The multiplexer distributes a plurality of transmitted high-quality images in parallel so as to perform image processing, The processor processes graphics image processing and display format conversion of the first distributed image signal, and the scaler rearranges the first image signal. The first image detector detects the first image signal at a first predetermined time The image can be detected.

The control unit 70 of the long distance transmission system according to the present invention includes a second image detection unit 71, an image matching unit 72, an image interpolation unit 73, and a delay time correction unit 74, The second image detecting unit 71 detects a second image that can be compared with the designated time according to the transmission of the first image, and the image matching unit 72 detects the first image of the first image detecting unit and the second image detecting unit The image interpolator 73 interpolates the lost image based on the matched image, and the delay time corrector 74 determines the delay time of the first image and the second image, Correct the delay time.

According to the present invention, signal attenuation of high-quality image data is image-interpolated by a long-distance transmission system of multi-channel high definition (HD class image) image data, thereby effectively performing long distance transmission.

In addition, according to the present invention, a high-quality image is transmitted on the basis of a first image transmission, and simultaneously the high-quality image is transmitted in a second image transmission, and a pre-stored image, in which the image processing of the first image transmission is completed, And then compare the image with the image transmitted in the second image transmission and then synchronize the image with the image interpolation and the delay time, and finally provide a lossless high-quality image to the user.

In addition, according to the present invention, it is possible to reproduce a high-quality image intact on the RX receiving side by a control unit having a function of image interpolation and delay time interpolation, . Accordingly, it is possible to provide a user with a clear high-quality image that can achieve the purpose of rapid parking guidance, fire detection, theft or intrusion monitoring.

1 illustrates a long-distance transmission system for multi-channel high definition (HD) video data for CCTV according to the present invention.
2 is a block diagram of a control unit of a long-distance transmission system for multi-channel high definition (HD) video data for CCTV according to the present invention.

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

FIG. 1 shows a long-distance transmission system for multi-channel high-quality image data for CCTV according to the present invention.

The long-distance transmission system of multi-channel high-quality image data for CCTV according to the present invention is largely transmitted in parallel with the first image transmission and the second image transmission.

The first video transmission will be described with reference to the drawings. First, a plurality of HD cameras 10 for capturing a digital high-definition image are connected to the HD TX 20 in parallel. The HD TX 20 receives the digital high definition image signal captured by the camera, converts the received digital high definition image signal into a plurality of analog image signals, and outputs the converted analog image signals through the parallel UTP cable. The HD junction box 30 performs coding processing according to preset signal data for each HD camera, and multiplexes the coded video signals to generate one video signal. In addition, the HD junction box modulates the generated video signal into a carrier wave and transmits it through a 1-line coaxial cable.

The signal data may include a time slot, a time slot period, and a coding scheme. The video signals are coded according to different coding schemes and are sequentially allocated to time slots, and the order of coding schemes may be changed in a preset time slot period.

The video signal may be selectively coded among coding schemes such as Convolution code, LDPC code, and RS code. For example, the first HD camera may be set to code using the convolution code, the second HD camera may be set to code using the RS code, and the third HD camera may be set to code using the RS code have. The coded video signals are then assigned to time slots in a predetermined order.

In addition, the coding order may be changed in a time slot period unit. For example, if the first, second, and third HD cameras are coded in order of Convolution code, LDPC code, and RS code in the Nth time period slot, the first, second, and third HD cameras Can be coded in the order of an RS code, a convolution code, and an LDPC code, respectively.

Then, the generated video signal is serially transmitted through a 1-line coaxial cable (UTP cable) connection. The one-line coaxial cable may have a length of at least 1 Km or more.

Next, the second video transmission will be described. Referring to FIG. 1, the HD junction box 30 further includes a second image transmission / transmission unit 100 for transmitting a high-quality image by streaming. The second video transmission transmitter includes a first gain differential amplifier for amplifying an image gain of the converted video signal to reduce a loss in transmission of the wired video signal over a long distance. The video signal output from the second video transmission and transmission unit is transmitted to the second video transmission and reception unit 110 via a relay unit (HUB). The second video transmission unit transmits the signal data generated from the HD junction box to the second video transmission unit.

The second video transmission / reception unit may transmit a wireless network using any one of MPEG-4 and H.264 compressively transmitting streaming of high-quality video data.

The second video transmission receiver includes a signal reconstructor for performing signal reconstruction to compensate for the attenuation of the video signal, a CMOS amplifier for amplifying the reconstructed signal to stream-modulate the analog video signal, and a time division demultiplexer And a second image processing processor for distributing the image stream in parallel.

The video signal received from the second video transmission and reception unit is transmitted to the control unit, and the signal data received from the second video transmission reception unit is transmitted to the HD RX.

Meanwhile, the image signal receiver 110 demodulates the image signal transmitted from the 1-line coaxial cable, and the HD RX converts the demodulated analog image signal into a digital image signal.

The HD RX 50 decodes the demodulated video signal based on the signal data. The HD RX decodes the demodulated video signal based on the coding scheme according to the time slot and the time slot period, and outputs the decoded video signal to the first image processing unit.

The first image processing unit includes a multiplexer, a first image processing processor, a scaler, and a first image detecting unit. In addition, the first image processing processor further includes a GPU for graphics processing and a display formatter for display format conversion.

The multiplexer distributes the transmitted plurality of high-quality images in parallel so as to perform image processing.

The first image processing processor processes graphics image processing and display format conversion of the first distributed image signal.

The scaler rearranges and arranges the first video signal. Also, the scaler upscales the high-quality image data processed after the image processing so that the lost pixel information can be displayed on the display and confirmed.

The first image detecting unit detects the first image at a time designated by the user's selection.

Then, the controller 70 detects two high-quality image signals transmitted by the first image transmission and the second image transmission, and then performs image interpolation and delay time interpolation.

The DVR 80 records a digital high definition video signal, and the output unit 90 outputs a high definition video signal.

Hereinafter, a control unit of the long-distance transmission system according to the present invention will be described with reference to FIG.

2 is a block diagram of a control unit of a long-distance transmission system for multi-channel high definition (HD) video data for CCTV according to the present invention.

The control unit 70 of the transmission system according to the present invention includes a second image detection unit 71, an image matching unit 72, an image interpolation unit 73, a delay time correction unit 74, an HD output unit 75).

The second image detector 71 detects a second image that can be compared with a designated time according to transmission of the first image.

In this manner, the image selected by the first image detecting unit of the first image signal processing unit is transmitted to the image matching unit together with the corresponding image selected by the second image detecting unit.

The image matching unit 72 matches the first image of the first image detecting unit and the second image of the second image detecting unit. The image matching unit may further include a loss compensation image combining unit having a loss compensation value of the image data. Accordingly, it is possible to apply an accurate loss value to the image interpolation.

The image interpolator 73 interpolates the lost image based on the matched image. Specifically, the image interpolator compares the image stream transmitted by using the RGB format converted by the display formatter with the image data of the second detector 71, and restores the lost pixel image.

The delay time correcting unit 74 corrects the delay time by determining the delay times of the first image and the second image. Preferably, the high-quality image data stored in advance after the determination of the delay time is collectively corrected through selective input by the user. The first image may be transmitted by wire, and the second image may be transmitted by wireless.

In this way, the final corrected high-definition video signal is transmitted to the HD output unit 75 using the HDMI (High Definition Multimedia Interface) connection.

By using the long distance transmission system of the image data according to the present invention, it is possible to capture up to 256 HD cameras while classifying a large building or a shopping center having a video transmission distance of 1 km or more as a plurality of transmission units (HD TX) A single PC can be used to control one image through a central control room consisting of 256 HD cameras.

Also, the video data transmitted with the integrated management control unit for the central control can be stored in real time by storing the large-capacity server, and then the high-quality image can be collectively processed through the delay time and the image interpolation.

The main advantage of the present invention is that the conventional wired transmission equipment is used as it is and only the second image transmission equipment is added to compensate the attenuation rate and the receiver can mutually interpolate the lost parts in transmitting the high quality image data, Can be provided.

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

10: Multiple HD cameras 20: Multiple HD TX
30: HD junction box 40: image signal receiver
50: HD RX 60: first image processing section
70: control unit 80: DVR
90: output unit 100: second image transmission unit
110: second image receiving unit

Claims (3)

Channel high-quality image data for CCTV through time and image interpolation,
An HD TX 20 for receiving a plurality of digital high definition video signals captured by a plurality of HD cameras 10, converting the received digital high definition video signals into a plurality of analog video signals and outputting them through a parallel UTP cable, An HD junction box 30 for serially transmitting a plurality of analog video signals through a one-line coaxial cable (UTP cable) connection to the generated video signal, and a video signal receiver 30 for demodulating the video signal and extracting a plurality of analog video signals (40); An HD RX 50 for converting the extracted analog signal into a digital high definition image signal, a first image processing unit 60 for performing image processing, and a second image processing unit 60 for detecting different high quality image signals, A DVR 80 for storing the converted digital high definition video signal, and an output unit 90 for reproducing a digital high definition video signal,
The HD RX 50 is provided with a second image receiving unit and the second image transmitting unit is connected to the second image transmitting unit 100 via a hub, Lt; / RTI >
The HD junction box 30 performs a coding process according to preset signal data for each HD camera, and the signal data includes a time slot, a time slot period, and a coding scheme,
The video transmission through the 1-line coaxial cable is performed by coding an image captured by a plurality of HD cameras with preset signal data, Transmitted to the HD RX 50 via the video signal receiver 40, The signal data is transmitted to the HD RX through the second image receiving unit 110. The HD RX is configured to decode the image signal based on the signal data,
The first image transmission is an image transmission through the HD junction box 30, the image signal receiver 40 and the HD RX 50, and the first image transmission is image transmission through the HD junction box 30, 2 video transmission is an image transmission through the second video transmitter 100, the hub (HUB), and the second video receiver 110. The long-distance transmission system of the multi-channel high-
The method according to claim 1,
Wherein the first image processing unit comprises a multiplexer, a first image processing processor, a scaler, and a first image detecting unit, wherein the multiplexer distributes a plurality of transmitted high-quality images in parallel so as to perform image processing, The processor processes graphics image processing and display format conversion of the first distributed image signal, and the scaler rearranges the first image signal. The first image detector detects the first image signal at a first predetermined time Channel high-quality image data for a long-distance transmission.
The method according to claim 1,
The controller 70 includes a second image detector 71, an image matching unit 72, an image interpolator 73 and a delay time corrector 74. The second image detector 71, The image matching unit 72 matches the first image of the first image detecting unit and the second image of the second image detecting unit, The image interpolator 73 interpolates the lost image based on the matched image, and the delay time corrector 74 corrects the delay time by determining the delay time of the first image and the second image. Long - distance transmission system of CCTV multi - channel high - definition video data.

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