KR101172389B1 - Hybrid network camera - Google Patents

Abstract

PURPOSE: A hybrid network camera is provided to transmit a high definition image more than HD class utilizing a coaxial network and to improve security by compressing an image with desire revolution by using a high efficiency compressed codec. CONSTITUTION: A hybrid network camera comprises a camera module(100), an IP module(200) for a network camera, and an interface board(300). The camera module takes a photograph of an image. The camera module changes an YCbCr422 format signal of 16 bits into an LVDS(Low Voltage Differential signal) signal of 10bits. The IP module for the network camera is connected to the camera module and receives the LVDS of 10bits. The IP module for the network camera restores the LVDS of 10bits into the YCbCr422 format signal of 16 bits and changes it into an SDI(Serial Digital Interface) signal canning be transmitted to a coaxial cable. The IP module for the network camera compresses the YCbCr422 format signal of 16 bits. The interface board provides the SDI signal to the coaxial cable and provides the compressed YCbCr422 format signal of 16 bits to a network socket.

Description

Hybrid network camera {HYBRID NETWORK CAMERA}

The present invention relates to a hybrid network camera, and more particularly, to a hybrid network camera for achieving enhanced security and high image quality.

With the development of the Internet environment and networks, the demand for remote viewing of real-time video has increased, and the demand for various services for monitoring and video management has increased. As CCTV cameras play a decisive role in solving various recent crime cases, the video surveillance market is growing due to the increasing demand for CCTV cameras in the public and private security sectors.

Recently, with the emergence of intelligent video analysis solutions that analyze video through cameras, the utilization of network cameras is increasing in not only security surveillance but also marketing.

In addition, as all infrastructures are integrated on an IP basis, various information technologies (IT) are being merged with the video surveillance field to create new markets.

Now, we are entering the age of using one network camera image in various ways. For example, camera images for monitoring illegal dumping are designed to be used for security and management of crime prevention and green parking, and can be used for urban disaster prevention in emergencies. It is a basic function of a network camera to be used for such various purposes. The solution is evolving towards surveillance cameras utilizing a variety of visual information, including screaming, gesture recognition, tracking people and counting visitors.

With the addition of additional functions such as motion recognition and face recognition, network cameras are becoming more and more intelligent (smart) .In addition, it is not only possible to monitor video in a specific area, but also to the will of the user or the monitor. Accordingly, the demand for high performance network cameras of a speed dom type equipped with PAN, TILT, and ZOOM (PTZ) functions to move or enlarge an object of an image is increasing.

Previously, 410,000 pixels of the camera were VGA level (640x480 resolution). However, in recent years, the network camera for image acquisition has become a standard for mega pixels (SXGA, 1280x1024 or higher), and the H.264 support of compression method can reduce network burden and storage capacity to some extent. In environments that require high-quality video, megapixel cameras are easily selected.

Since TVs are already receiving HDTV broadcasts, the image quality of the camera is now very important, and the demand for camera video that can be displayed at least on HDTV is rapidly increasing. In addition, high-definition continues to digitize TVs and display monitors, and the environment for providing high-definition images has improved due to the improvement of the CCD and image processing chip of the camera.

Accordingly, the technical problem of the present invention is to solve such a conventional problem, and an object of the present invention is to provide a hybrid network camera for achieving high security and high security.

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In order to realize the above object of the present invention, a hybrid network camera according to an embodiment is a camera for capturing and converting a 16-bit YCbCr422 format signal obtained by capturing an image into a 10-bit low voltage differential signal (LVDS) signal. Module and connected to the camera module to receive the 10-bit LVDS signal, restore the 16-bit YCbCr422 format signal, convert it into a SDI (Serial Digital Interface) signal that can be transmitted over a coaxial cable, and transmit the data to the network. It is connected to an IP module for a network camera that compresses a 16-bit YCbCr422 format signal, and is connected to the IP module for a network camera, a coaxial cable, and a network socket to provide the SDI signal to the coaxial cable. And an interface board for providing a format signal to the network socket. The IP module for the network camera includes an SDI transmission processor connected to the camera module, a base processor connected to the camera module and the SDI transmission processor, and a CPU connected to the base processor. The SDI transmission processor receives a 10-bit LVDS signal converted from a 16-bit YCbCr422 format signal from the camera module, restores the 10-bit LVDS signal to an original signal, and transmits the restored 16-bit image data to a coaxial cable. The SDI signal is converted into an SDI signal of an analog type and output to an external SDI monitor, and the restored 16-bit image data is provided to the base processor. The base processor receives 16-bit image data restored from the SDI transmission processor, provides the CPU with a request for compression, and receives digital image compressed image data from the CPU and provides the external IP DVR.

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In the present embodiment, the camera module may convert a digital output (16-bit image data, H-Sync, V-Sync, Pclk) of the YCbCr422 format into an LVDS signal and transmit it to the SDI transmission processor.

According to such a hybrid network camera, since it is converted into an SDI signal that can be transmitted by a coaxial cable, it is possible to transmit a high-definition video of HD level or higher utilizing a coaxial network. In addition, high-efficiency compression codecs can be used to compress the video to the desired resolution, thereby enhancing network security.

1 is a block diagram illustrating a hybrid network camera according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a peripheral device connected to the hybrid network camera illustrated in FIG. 1.
3 is a table for explaining a detailed standard of the hybrid network camera shown in FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in more detail with reference to the accompanying drawings. As the inventive concept allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the text. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for like elements in describing each drawing. In the accompanying drawings, the dimensions of the structures are enlarged to illustrate the present invention in order to clarify the present invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. Singular expressions include plural expressions unless the context clearly indicates otherwise.

In this application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a part or a combination thereof is described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Also, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

1 is a block diagram illustrating a peripheral device connected to a hybrid network camera according to an embodiment of the present invention.

Referring to FIG. 1, the hybrid network camera 10 according to an exemplary embodiment of the present invention is supplied with power through a power cable, and records a CCTV image photographed by being connected to the controller / DVR 20 through an RS-485 cable. do. Here, the DVR may be an IP DVR.

The hybrid network camera 10 is connected to the Internet through a network cable to a user computer 30 for displaying a CCTV image, etc. via a web browser, the user computer 30 to provide a security-enhanced digital type CCTV image To provide.

The hybrid network camera 10 is connected to an IR sensor 42 or a door switch 44 through an I / O cable, and receives an operation recognition signal provided from the IR sensor 42 or the door switch 44. The on / off signal of the door provided from the. That is, intelligent video analysis functions such as motion detection and event alarm may be applied.

The power cable, RS-485 cable, network cable and I / O cable define the main cable.

The hybrid network camera 10 is connected to the SDI monitor 50 through a coaxial cable having BNC connectors at both ends, and outputs a high definition analog type CCTV image to the SDI monitor 50. In addition, the hybrid network camera 10 is connected to the microphone 62 or the speaker 64 through an audio cable.

According to such a hybrid network camera, even a high-definition camera is built as a system from storage and operation through a network, thereby achieving network support and system construction. The future CCTV system is expected to be a natural phenomenon for the demand and introduction of megapixel cameras.

In addition, when the IP network environment is inconvenient, it is possible to double the utilization by enabling the collection of high quality images using a coaxial network using SDI.

2 is a block diagram illustrating a hybrid network camera according to an embodiment of the present invention.

1 and 2, a hybrid network camera 10 according to an embodiment of the present invention includes a camera module 100, an IP module 200 for a network camera, and an interface board 300.

The camera module 100 converts a 16-bit YCbCr422 format signal obtained by capturing an image into a 10-bit low voltage differential signal (LVDS) signal capable of reducing the number of cable lines and reducing noise. To 200). In the present embodiment, the YCbCr422 format signal has a weaker color separation effect than RGB, but more colors can be represented with small data. Where Y is the luminance (amount of light) and Cb / Cr is the color difference. In general, the conversion formula between YCbCr and RGB may be defined by Equation 1 below.

[Equation 1]

R = Y + 1.402 * Cr

G = Y-0.334 * Cb-0.713 * Cr

B = Y + 1.772 * Cr

The network camera IP module 200 includes an SDI transmission processor 210 connected to the camera module 100, a base processor 220 connected to the camera module 100 and the SDI transmission processor 210, and The CPU 230 is connected to the base processor 220, and receives the 10-bit LVDS signal, restores the 16-bit YCbCr422 format signal, converts the SDI signal into a coaxial cable, and transmits the same to the network. Compresses the 16-bit YCbCr422 format signal. Each of the SDI transmission processor 210 or the base processor 220 may be configured as a chip type and disposed on a separate board.

The SDI transmission processor 210 receives a 10-bit LVDS signal converted from a 16-bit YCbCr422 format signal from the camera module 100, restores the 10-bit LVDS signal to an original signal, and restores the restored 16-bit image data. It converts an analog type SDI (Serial Digital Interface) signal that can be transmitted through a coaxial cable, outputs it to an external SDI monitor 50, and provides the restored 16-bit image data to the base processor 220.

Here, SDI is a serial digital signal transmission method that transmits an uncompressed digital video signal through one cable. By serializing a 10-bit word uncompressed digital video signal, for example, a 75-ohm coaxial cable can transmit over 350m for SD class and 150m for HD class.

And since H.264 or MPEG uses non-compressed signals rather than compressed signals, there is no aging or delay (minimum 200 msec) of image quality due to compression extension.

Conventional digital video signals are processed as parallels inside the device, but problems arise when connecting to external devices. A digital component signal consisting of a 10-bit luminance signal, a 10-bit color signal, a 1-bit clock signal, and a 1-bit synchronization signal requires at least 22 cables, which makes it difficult to handle and the phase between the signal data and the clock. Problems such as interference occur, making long distance transmission impossible.

However, since SDI serializes everything including luminance signals, color signals, synchronization signals, and clock information in one cable, long-distance transmission is possible. Therefore, by outputting the SDI signal, HD-quality video can be transmitted over a long distance without loss.

The base processor 220 receives the 16-bit image data reconstructed from the SDI transmission processor 210, provides the CPU 230 with a request for compression, and provides the digital image compressed image data with the CPU 230. It is provided from external IP DVR. The base processor 220 is connected to the camera module 100 in an RS-232 / TTL manner.

The CPU 230 receives the restored YCbCr422 format signal through an ISIF (Image Sensor Interface) of a Video Processing Front End (VPFE) block and encodes the same through a SW codec. For example, the CPU 230 may compress the restored YCbCr422 format signal into an H.264 type, an MPEG4 type, or an MJPEG type.

In the present embodiment, the CPU 230 may use DM365 as a security chip provided by Texas Instruments (TI). The DM365 is a digital media processor that enables developers to provide pixel-perfect images without worrying about image format support, network bandwidth, or system storage capacity limitations when designing digital images. DM365 includes codecs such as H.264, MPEG-4, MPEG-2, MJPEG, and VC1, integrated image signal processing (ISP) solutions for intelligent image processing, and on-board peripherals to help developers maximize system costs. Save up to 25%

The interface board 300 is connected to the IP module 200 for a network camera, a coaxial cable, and a network socket to provide the SDI signal to an SDI monitor through the coaxial cable, and to compress the compressed 16-bit YCbCr422 format signal. To a user computer connected to an external IP DVR or the Internet through the network socket.

3 is a flowchart for describing a method of driving the hybrid network camera illustrated in FIG. 2.

1 to 3, the SDI transmission processor 210 checks whether a 10-bit LVDS signal converted from a 16-bit YCbCr422 format signal is received from the camera module 100 (step S110).

In step S110, when it is checked that the LVDS signal is received from the camera module 100, the SDI transmission processor 210 of the IP camera 200 for the network camera restores the received LVDS signal to a YCbCr422 format signal. (Step S120). The restored YCbCr422 format signal is provided to the CPU 230 via the base processor 220.

Subsequently, the CPU 230 of the network camera IP module 200 compresses the restored YCbCr422 format signal (step S130), and the compressed YCbCr422 format signal is a base processing unit of the network camera IP module 200 ( 220 is provided.

Subsequently, the base processing unit 220 of the network camera IP module 200 checks whether a network is connected (step S140).

If it is checked in step S140 that the network is connected, the base processor 220 of the network camera IP module 200 transmits the compressed YCbCr422 format signal through the interface board 300 (step S150). In the present embodiment, it is described that the base processor 220 checks whether the network is connected. However, the checking of the network connection may be omitted. In addition, although the base processor 220 checks whether the network is connected, a separate member, for example, a controller may be disposed to check whether the controller is connected to the network.

Meanwhile, the SDI transmission processing unit 210 of the network camera IP module 200 converts the YCbCr422 format signal restored in step S120 into an SDI signal (step S160).

Subsequently, the SDI transmission processor 210 of the network camera IP module 200 checks whether a coaxial cable is connected (step S170).

If it is checked in step S170 that the coaxial cable is connected, the SDI transmission processing unit 210 of the IP camera module 200 for the network camera outputs the SDI signal through the coaxial cable (step S180). In the present embodiment, the SDI transmission processor 210 checks whether the coaxial cable is connected. However, the step of checking whether the coaxial cable is connected may be omitted. In addition, the SDI transmission processing unit 210 has been described to check whether the coaxial cable is connected, but a separate member, for example, a controller is disposed, the controller may check whether the coaxial cable is connected. .

 Although described above with reference to the embodiments, those skilled in the art can be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims below. I can understand.

As described above, the network camera according to the present invention compresses HD (1280x720) high-definition video with compression codecs such as H.264 and MPEG, and transmits 30 frames per second of streaming video. Therefore, the high-efficiency compression codec can compress the image to a desired resolution, and the transmission bandwidth is wide and applicable to various Internet environments.

In addition, it supports the pen-tilt function to adjust the camera's up, down, left and right by accessing the internet from a remote location, and can also provide various focus modes and optical 10x and 18x zoom functions.

In addition, it is designed to connect an external sensor directly to the camera, so that a variety of sensors can be additionally used.The SDI interface allows network video transmission and HD video transmission over coaxial network, enabling market responsiveness and installation flexibility. Secured.

In addition, unlike analog CCTV, network cameras can be connected to an infinite number of surveillance cameras, so it is easy to build an integrated solution, and as a result, it is integrated with content management system (CMS) solutions instead of network cameras. Can be commercialized.

10: network camera 20: controller / DVR
30: user computer 42: IR sensor
44: door switch 50: SDI monitor
62: microphone 64: speaker
100: camera module 200: IP module for the network camera
210: SDI transmission processing unit 220: base processing unit
230: CPU 300: interface board

Claims (5)

delete delete delete A camera module for capturing an image and converting the obtained 16-bit YCbCr422 format signal into a 10-bit low voltage differential signal (LVDS) signal and outputting the signal;
It is connected to the camera module, receives the 10-bit LVDS signal, restores the 16-bit YCbCr422 format signal, converts it into a SDI (Serial Digital Interface) signal that can be transmitted over a coaxial cable, and transmits the 16-bit An IP module for a network camera that compresses a YCbCr422 format signal; And
And an interface board connected to the IP module for the network camera, a coaxial cable, and a network socket to provide the SDI signal to the coaxial cable and to provide the compressed 16-bit YCbCr422 format signal to the network socket. IP module for network camera,
An SDI transmission processor connected to the camera module;
A base processor connected to the camera module and the SDI transmission processor; And
A CPU connected to the base processor;
The SDI transmission processor receives a 10-bit LVDS signal converted from a 16-bit YCbCr422 format signal from the camera module, restores the 10-bit LVDS signal to an original signal, and transmits the restored 16-bit image data to a coaxial cable. Converts the analog type SDI signal to an external SDI monitor and provides restored 16-bit image data to the base processing unit;
The base processing unit receives 16-bit image data restored from the SDI transmission processing unit, provides the CPU with a request for compression, and receives digital type compressed image data from the CPU to provide an external IP DVR. Featuring a hybrid network camera. The hybrid apparatus of claim 4, wherein the camera module converts a digital output (16-bit image data, H-Sync, V-Sync, Pclk) of YCbCr422 format into the LVDS signal and transmits the LVDS signal to the SDI transmission processor. Network camera.

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