KR100478223B1 - A network camera using moving-picture compression, and visual system thereby - Google Patents

Abstract

According to the present invention, a video file is compressed by using a video compression method having a high compression efficiency, and a video file is configured to deliver an image file through a network, but each image file is configured to be an integer number of basic units of temporal image compression operation. It relates to an imaging system technology.

Description

 A network camera using moving-picture compression, and visual system thereby

The present invention relates to a network camera using a video compression method and an imaging system using the same. In particular, the present invention is to compress the image data taken by using the video compression method having a high compression efficiency to configure the image file and to deliver the image file through the network so that each image file is an integer number of basic units of temporal image compression operation TECHNICAL FIELD The present invention relates to a video system technology to be configured.

Recently, a movement to construct a video system, in particular a video security system, using a network camera, also called a web camera, is active. Network camera is an all-in-one camera that integrates existing camera, internet server, and computer, and has the advantage of viewing images in real time using the Internet anywhere without the help of external devices. And various Internet businesses. Network cameras generally have a network interface, such as a telephone line, xDSL line, or ethernet, so that they can be directly connected to an external network.

1 is a diagram conceptually illustrating a configuration of a network camera and a configuration of an internet video service system using a network camera. The Internet video service system shown in FIG. 1 (a) is composed of a network camera 110, an internet 120, and a computer system 130. First, the network camera 110 processes image data obtained by photographing an object. After generating an image file, the image file is transmitted through the Internet 120 using a predetermined network protocol, and the computer system 130, which is usually located at a remote site, receives, displays, and stores the transmitted image file. .

The network camera shown in FIG. 1 (b) is an imaging unit 140 for imaging an object to generate image data, and an image data processor 150 for processing such image data and preferably performing image compression to generate an image file. Internet server unit 160 that holds an image file and provides an image file in response to the request, and a network interface unit 170 that provides access to the network 180. .

In FIG. 1 (b), the image data processing unit 150 basically generates an image file by processing the image data. However, the image data processing unit 150 preferably performs image compression in order to reduce the size of the generated image file. In the method of image compression, the JPEG method has been conventionally used, and there has been a recent movement to use the wavelet method to improve its performance. In terms of compression rate, the JPEG method is typically on the order of 1/10 to 1/20 and the wavelet method is known here to obtain an additional improvement of 30% to 300%.

In the configuration of the network camera of FIG. 1 (b), the Internet server unit 160 is not necessarily required, and is specifically included when providing a server function to the network camera, and the network interface unit 170 is applied to the application system. Thus, it is possible to support various known network interface specifications as described above.

2 is a diagram conceptually showing a configuration of a video security system using a network camera. The video security system of FIG. 2 is comprised of one or more network cameras 210: 1 to 210: 4, a network 220, and one or more computer systems 230: 1 and 230: 2. In the system of FIG. 2, network 220 may be the Internet, which is an open network, or may be an intranet, such as an internal network. As shown in FIG. 2, image files generated by one or more network cameras 210: 1 to 210: 4 are transmitted through the network 220 to be appropriately monitored by one or more computer systems 230: 1 and 230: 2. Stored on a recordable or recordable media. Image files transmitted from the network cameras 210: 1 to 210: 4 are generally compressed, and computer systems 230: 1 and 230: 2 generally compress files in order to display them on a monitor. To process the file and save the video file on the media, process the file as it is.

As described above, a compression algorithm used in generating an image file in a network camera is a JPEG method or a wavelet method, which are a still picture compression method that depends on intra-frame compression in common. This is because the correlation between frames is lost when multiplexing in computer systems 230: 1 and 230: 2 in order to display image files generated by one or more network cameras 210: 1 to 210: 4 on the screen. . In general, inter-frame compression is performed in the case of a video compression method capable of obtaining a higher compression rate, such as MPEG-2 compression. In a system that temporally multiplexes image data generated by one or more network cameras It has been recognized as not appropriate.

Accordingly, the network cameras 210: 1 to 210: 4 compress the data by a still image compression method such as JPEG or wavelet method and transmit the data to the computer system 230: 1 and 230: 2 through the predetermined network 220. In the computer systems 230: 1 and 230: 2, the compressed video data is recorded on a predetermined recordable medium, while the compressed video data is decompressed and displayed on the screen as appropriate.

In the case of the video security system configured as described above, the compression efficiency of the image data is not so high, so the capacity of the image data storage space must be very large, and the contents of the storage space must be backed up and exchanged relatively frequently.

Accordingly, the present invention provides a network camera having a high compression efficiency with respect to the image data by using a video compression method, and having at least one such network camera and storing the image data transmitted from the at least one network camera in a predetermined storage space It is an object of the present invention to provide an image system that can be properly demuxed and displayed on a screen.

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

3 is a diagram conceptually illustrating a configuration of an imaging system according to the present invention. The imaging system of the present invention comprises one or more network cameras 310: 1 to 310: n, which are preferably arranged remotely from each other to capture image information respectively. The image data is generated by compressing the captured image data independently, and is connected to the host system 330 through a predetermined network 320 so as to transfer the generated image file to the host system 330. have.

The network cameras 310: 1 to 310: n of the present invention preferably each have a unique identifier, which is referred to herein as a web ID for convenience. The web ID may be set to be used exclusively by the person designing the video system, or may apply a known technique known to be used for the purpose of identifying each terminal in the network field. However, the identifier may not be included for the purpose of use in the application of the video system using one network camera.

For example, the web ID register is implemented in a specific internal address space of a network camera, and each network camera has a different value in this register, and then the value of this register is used as the web ID of each network camera. Consider the case of designing to use.

On the other hand, as an example of applying the known technology, it is possible to use the case of using the IP address used in the Internet protocol. Since IPv4 (IP version 4) lacks the actual number of available IPs, it is preferable to use a technique such as the Network Address Translation (NAT) protocol or the Dynamic Host Configuration Protocol (DHCP). If not, it is expected that it is possible to configure the network of the network camera as shown in Fig. 3 using the actual IP address for every network camera.

In the present invention, the network 320 is not particularly limited in its kind and may be appropriately selected according to the field of application of the present invention. For example, it may be preferable to use a general Internet when covering a very large area, and it may be more preferable to use an internal network of a building, for example, a cable network, when serving a single area of a building. Similarly, the present invention does not impose any restriction on the manner in which the network cameras 310: 1 to 310: n are connected to the network 320 or the manner in which the host system 330 is connected to the network 320.

In the present invention, the image file is transmitted from the specific network camera 310 (k) to the host system 330 via the network 320 may be a push method or a pull method. In the present specification, the push method refers to a method in which the network camera 310 (k) transmits an image file to the host system 330 through the network 320, and the pull method indicates that each network camera 310: k is an image file. In a predetermined memory space, the host system 330 accesses the above-described memory space and reads an image file. In the present invention, any method may be used, and only the image file generated by the network camera 310 (k) is transferred to the host system 330 through the predetermined network 320.

The multiple access modem 340 is responsible for the network interface of the host system 330. Preferably, one or more network cameras 310: 1 to 310: n are connected in time-division via the network 320. Thereby providing access to the image file. The above-described web ID may be used to distinguish one or more network cameras 310: 1 to 310: n from each other in this process. Here, time division is to be understood as one of several selectable methods for multiple access of one or more terminals, and should not be construed as essential to the present invention. That is, it is also possible to access in a frequency division manner by assigning different frequency ranges to one or more network cameras 310: 1 to 310: n.

The muxing / demuxing unit (MUX / DEMUX: 350) displays a screen on the display 360 or the data management unit 370 by appropriately distributing a plurality of image files transmitted from one or more network cameras 310: 1 to 310: n. ) To record and play back. The muxing / demuxing unit 350 according to the present invention may perform various functions. First, among the plurality of image files transmitted from one or more network cameras 310: 1 to 310: n, only the necessary image files are selected and transferred to the display unit 360 or the data manager 370 according to a predetermined criterion. Function can be performed. At this time, it is most common to select an image file corresponding to one or more network cameras 310 (k) selected by a user (or administrator) of the system as a standard for selecting an image file.

In this case, the muxing / demuxing unit 350 selects an image file corresponding to one or more network cameras 310: k selected by the user and transmits the image file to the display unit 360 and the data manager 370 according to the implementation. Alternatively, the display unit 360 selects and delivers only the image file corresponding to one or more network cameras 310: k selected by the user, and the data manager 370 delivers a wider range of image files. It may be implemented to. The former is a case more faithful to the user's command, the latter is a case more faithful to the purpose of recording image data.

In addition, the muxing / demuxing unit 350 displays the data output from the data management unit 370 to the display unit 360 when the data management unit 370 operates in the play mode as described below. It may be displayed on the screen of the unit 360. That is, the muxing / demuxing unit 350 displays an image file input through the multiple access modem 340 according to a user's input or system mode (recording mode, playback mode) in relation to the display unit 360. Or the data output from the data manager 370 to the display 360.

In addition, the muxing / demuxing unit 350 may also time-based MUXing the image file transmitted from the network camera 310 (k), which will be described in the process of compressing and decompressing image data. This is explained in the section.

As described above, the display unit 360 performs a function of displaying, on the screen, data distributed through the muxing / demuxing unit 350. The display unit 360 preferably includes a decompression unit 360: 1 and a display control unit 360: 2. The decompression unit 360: 1 decompresses an image file and extracts the original image file from the original state. It is responsible for the function of restoring the image information, the display control unit 360: 2 is responsible for the function to be properly displayed on the screen by scaling and muxing the transmitted image information.

The data management unit 370 basically has a recording mode and a reproduction mode as an operation mode. In the recording mode, the data management unit 370 performs a function of recording an image file transmitted from the muxing / demuxing unit 350 to a predetermined recordable medium, and in a reproduction mode. In the present invention, the image data stored in the predetermined playable media is reproduced to output the data to the muxing / demuxing unit 350. The channel coding unit 370: 1 is responsible for performing data conversion and format conversion so that recording and playback can be maintained in an optimal state. The recording and playback unit 370: 2 converts input data into a hard disk or a tape, It is responsible for the function of recording on predetermined recordable media such as DVD-R and the like and playing back data stored in the predetermined reproducible media.

In the data management unit 370 according to the present invention, the recording function is essential, but the reproduction function is optional. In other words, the name and description of the recording / reproducing section 370: 2 are for convenience only, and it should not be interpreted that the data management section 370 must have both the recording and reproducing functions. However, it is more preferable as an example to have both a recording function and a reproduction function. In addition, the channel coding section 370: 1 may be integrated into the recording / reproducing section 370: 2 and may be implemented integrally or sometimes not necessary.

Subsequently, a process of generating an image file by compressing the image data in the network cameras 310: 1 to 310: n, and a process of compressing the plurality of image files in the muxing / demuxing unit 350 of the host system 330 and compression A process of decompressing the release unit 360: 1 will be described.

Currently, there are various methods of compressing image data, but in the present specification, the various image compression methods are largely divided into a still image compression method and a video compression method. The still picture compression method defined in the present specification refers to a method of applying a spatial image compression technology in one frame. The conventional JPEG method or the GIF method corresponds to the still picture compression method. On the other hand, the video compression method defined herein refers to a method of applying a temporal video compression technique between a plurality of frames, in addition to the conventional MPEG method corresponds to the video compression method. The video compression method has the advantage that the compression efficiency is much higher than the still picture compression method, which is particularly remarkable when the correlation between successive frames is high.

The network camera 310 according to the present invention uses a video compression method among the two compression methods described above, in order to increase the compression efficiency. In the video compression method, there is a basic unit of temporal video compression, which is commonly called a GOP (Group Of Pictures).

Hereinafter, the GOP used as a term indicating a basic unit of temporal image compression will be described. There are three types of pictures in the MPEG method, which is a representative technique of the video compression method, which are an I-picture, a B-picture, and a P-picture, respectively. I-picture is an abbreviation of intra-coded picture and applies only spatial image compression as in the above-mentioned still picture compression method, and P-picture is an abbreviation of predictive-coded picture. It is a combination of spatial image compression and temporal image compression using the I-picture information and P-picture information of B-picture, which stands for Bidirectional-coded picture, before and after I-picture. It is a combination of spatial image compression and temporal image compression using both information and P-picture information. In video compression schemes other than the MPEG scheme, the types and definitions of the pictures may be different from those described above. Nevertheless, it is contemplated that there are still pictures or frames corresponding to the above-described I-pictures. In the video compression method, these various pictures may appear alternately. In the present specification, a sequence of pictures until an I-picture becomes the next I-picture is defined as a GOP. Conceptually, a GOP is itself the smallest chunk that can be decompressed and decoded.

Referring to the MPEG standard, which is one of video compression broadcasting, and the ATSC standard, which is a standard for terrestrial digital broadcasting for North America, the terms GOP are defined, but the concept of GOP used herein is not limited thereto. That is, the MPEG standard defines one GOP as an "IBBPBBPBB" picture sequence, and the ATSC standard defines one GOP as a sequence consisting of up to 15 pictures, for example, an "IBBPBBPBBPBBPBB" picture sequence. The concept of the GOP to be used is not limited to this, but is defined as "sequence of a series of pictures until the I-picture becomes the leading and the next I-picture appears". This definition should be interpreted flexibly: the entirety of one or more network cameras 310: 1 to 310: n may share a single GOP definition or use an independent GOP definition for each network camera 310: k. In addition, the definition of the GOP may also change within one network camera 310: k according to time. This is because doing so does not cause any problems in passing or decompressing data.

The network camera 310 (k) according to the present invention generates an image file by compressing image data using a video compression method as described above. In consideration of the decompression at 330, the image information included in one image file corresponds to an integral number of GOPs. That is, the network camera 310 (k) compresses the captured image data by using a predetermined video compression method, converts the image data into a series of picture sequences, divides them into integer units of the GOP, and configures the image files, respectively. The image file is transmitted to the host system 330 through 320.

The network camera 310: k generally includes image information corresponding to an integer number of GOPs in one image file, and this integer value is a natural number of 0 or more, which may be different for each image file. A certain number of GOPs should be included in each image file.

In more detail, the image file of the present invention may include a special type of image file including no management information but only management information. Thus, in the present specification, one image file includes image information corresponding to an integer number of GOPs. However, when the above-described special type image file is defined as an image management file separately, the image file is a natural number of GOPs. It may also be described that it includes the image information corresponding to). In this case, the above-described video management file is composed of information on the network camera itself or information on the attribute of the video information generated by the network camera.

As described above, a push method and a pull method are described as a method of transferring an image file from one or more network cameras 310: 1 to 310: n through the network 320 to the multiple access modem 340 of the host system 330. There is a bar. In the above-described push method, the multi-access modem 340 preferably includes a memory space for storing a plurality of GOPs, and in a pull method, a network space for the network camera 310: k for storing one or more GOPs is included. do.

The network camera 310 (k) may generate an image file by compressing the image data obtained by capturing the image data as described above using a predetermined video compression method. A device capable of detecting a motion of a surrounding, that is, a motion detector It is possible to construct a more intelligent embodiment in the case of further comprising). For example, if external motion is not detected from the motion detector or the degree of movement is small, the captured video data is regarded as little or no change, and the video compression method is adjusted in a direction that maximizes the compression rate, and conversely, In the case where it is detected, it is possible to consider that there is a large change in the captured image data and to adjust the video compression method in a direction to preserve the image quality as much as possible. At this time, the determination in the motion detector is preferably possible in three states, wherein the first state corresponds to a mode for maximizing the compression ratio, the second state corresponds to a normal mode, and the third state is a mode for preserving the image quality. Corresponds to. On the other hand, the motion detector may be determined in two states, corresponding to a normal mode having a relatively high compression ratio in the first state, and corresponding to a mode for preserving the image quality in the second state.

In the video compression method, the compression ratio and the image quality have a trade-off relationship with each other. In general, the compression ratio is controlled by using a quantization level. That is, in the network camera 310 (k) according to the present invention, it is preferable to set the compression rate to increase while sacrificing the image quality when it is detected that the movement is small, and to increase the compression rate when it is detected that the movement is large. Set to get the image quality.

In the above description, the compression rate is adjusted using the quantization level for convenience. However, the present invention is not to be construed as being limited thereto, but it should be interpreted as technically possible to elastically adjust the compression rate. In addition, it should be interpreted that the motion detector may be implemented in software rather than hardware. For example, when inter-frame compression is performed on a series of video frames, the inter-frame correlation is temporarily reduced at the moment when a special motion occurs, and the amount of compressed data increases. It may be considered to have been detected.

On the other hand, in the image quality preservation mode described above, the compression of the image data may not be the above-described video compression method. In other words, for the modes other than the image quality preservation mode, as described above, a video image compression method is used and a compressed image file is generated to include an integer number of image information of the GOP. By compressing the compressed video file, the compressed video file may be composed of the image data having better image quality instead of sacrificing the compression ratio. In such an implementation, information indicating whether a video compression method or a still image compression method is used must be inserted into the compressed video file. Of course, as described above, in the case of using a video compression method for all modes but changing the compression ratio for each mode, such information will not need to be inserted.

Next, as described above, the process of receiving image files transmitted from one or more network cameras 310: 1 to 310: n, displaying them on the screen on the display 360, and recording them on the data manager 370 is shown in FIG. It demonstrates with reference.

4 illustrates an embodiment in which image files transferred from one or more network cameras 310: 1 to 310: n are properly demuxed in the muxing / demuxing unit 350 of the host system 330 in the imaging system according to the present invention. Figure is a diagram. In the embodiment of FIG. 4, it is assumed that the number of network cameras is three in the image system of FIG. 3. Accordingly, the web IDs are 1 to 3.

The plurality of image files shown in FIG. 4 are generated by one or more network cameras 310: 1 to 310: 3 and transmitted through the network 320, and then muxed by the host system 330 through the multiple access modem 340. It is input to the / demux 350. As shown, each image file includes a web ID and a GOP number as information for demuxing. The web ID is information for identifying a network camera that created the image file. The GOP number is a kind of continuity counter, which is information added to an image file to verify continuity and continuity between a series of image files generated by the network camera 310: k. Although not shown, the image file may further include other information depending on the implementation type, for example, the size and the expiration date of the image file, in addition to the web ID and the GOP number.

The muxing / demuxing unit 350 of FIG. 4 receives a series of image files and arranges them in a separate memory space for each web ID. As shown, separate image file sequences for each web ID 410, 420, 430 is configured. The muxing / demuxing unit 350 refers not only to the web ID but also the GOP number in order to arrange the image files. This is because not only the propriety relations of the transmitted data are not maintained but also the data is lost. That is, in FIG. 4, video files having consecutive GOP numbers for each web ID are input to the muxing / demuxing unit 350, but are input to the muxing / demuxing unit 350 according to the type or state of the network 320. This can happen if the GOP numbers are reversed or even missing.

Therefore, the muxing / demuxing unit 350 preferably references not only the web ID but also the GOP number in ordering the image files. However, as described above, since the image file according to the present invention includes integer number of image information of the GOP, the correlation between adjacent image files is not close, so the temporal muxing operation referring to the GOP number is optional in the present invention.

The GOP number, which is the information included in the image file, is preferably set by copying from a counter of a finite bit length. Since the bit length is finite, the GOP number is rolled up at a specific number according to the bit length. In the embodiment of Fig. 4, the GOP number is obtained from a 6-bit long counter, so in the case of Sequence 3 (430), the web ID is rolled up at 63, leading to zero.

5 to 8 illustrate another embodiment of an imaging system according to the present invention. In the embodiment of Fig. 5, the image files delivered from the network cameras 510: 1 to 510: n are first collected in the server system 540, and then transferred to the host system 530 for display and recording / reproducing. Has The server system 540 includes a multiple access modem 540: 1 and a data server 540: 2, wherein a plurality of image files transmitted from the network cameras 510: 1 to 510: n are stored in the multiple access modem 540. The data is stored in the data server 540: 2 in the order in which the data comes in through: 1). The stored image file data is transferred to the host system 530 through the server interface 580, and then processed as described above with reference to FIG. Using this configuration, the interface with the network 520 is dedicated to the server system 540, thereby reducing the load on the host system 530.

The embodiment of FIG. 6 is an example configured such that the portion in charge of the function of demuxing the image file is located in the server system 640 in the embodiment of FIG. In this embodiment, server system 640 includes multiple access modem 640: 1, demux 640: 2, and data server 640: 3, which includes network cameras 610: 1 to 610: n. The plurality of video files transmitted from the multi-mode modem 640: 1 enters the server system 640 through the multiple access modem 640: 1 and is arranged in the demux 640: 2 by the web ID and preferably the GOP number. 640: 3). The stored image file data is transferred to the host system 630 through the server interface and the switch unit 650, displayed on the screen on the display unit 660, and recorded and reproduced by the data management unit 670, the server system 640 Since it is already demuxed when stored in the host system 630, a part for demuxing is not necessary separately.

The embodiment of FIG. 7 is an example in which the host system 630 is divided into a functional unit for display, that is, a display system 750 and a recording unit, that is, a recording system 730, in the embodiment of FIG. 6. In processing image files transmitted from one or more network cameras 710: 1 to 710: n, the function of displaying the captured information on the screen and the recording function on a predetermined media does not necessarily have to be related. In the embodiment according to the embodiment may be implemented separately as shown in FIG. In the embodiment of Figure 7, the recording system 730 is responsible for continuously recording the image file data stored in the server system 740, the display system 750 to the server system 740 in accordance with the user's command It is responsible for selecting and displaying the stored image file data on the screen.

FIG. 8 illustrates an example in which the display system 850 includes the functional units 850: 2 that are in charge of demuxing in the embodiment of FIG. 7. The demuxing function is not necessary for recording image file data, but is necessary for displaying on the screen. Therefore, as shown in FIG. 8, the demuxing unit 850: 2 is not a server system 840 but a display system 850. Can be implemented as

As described above, the imaging system according to the present invention can be implemented in various ways within the scope of the present invention. In addition to the embodiment shown in Figures 3 to 8 it is possible to implement a variety of imaging system of the present invention, the scope of the present invention is defined by the claims to be described later.

According to the present invention, by configuring an image system using a video compression method having a high compression efficiency, it is possible to increase the efficiency of the storage system and to prolong the exchange and backup cycle of recording media.

1 is a diagram illustrating a configuration of a network camera and a configuration of an internet video service system using a network camera.

2 is a diagram illustrating a configuration of a video security system using a network camera.

3 illustrates an embodiment of an imaging system in accordance with the present invention.

4 is a diagram illustrating an embodiment in which image files transferred from a network camera are properly demuxed in the imaging system according to the present invention.

5 illustrates another embodiment of an imaging system in accordance with the present invention.

6 illustrates another embodiment of an imaging system in accordance with the present invention.

7 illustrates another embodiment of an imaging system in accordance with the present invention.

8 illustrates another embodiment of an imaging system in accordance with the present invention.

<Explanation of symbols for the main parts of the drawings>

310: network camera

320: network

330: host system

340: multiple access modem

350: muxing / demuxing unit

360: display unit

360: 1: decompression unit

360: 2: display control

370: data management unit

370: 1: channel coding part

370: 2: recording and playback section

Claims (16)

An imaging unit 140 for photographing an object to generate uncompressed image data; A motion detector for detecting the presence and / or degree of external movement; The video data processor 150 generates compressed video data by encoding the uncompressed video data using a specific video compression using temporal video compression, and resets the compression ratio of the video compression in inverse proportion to the external motion as a result of the motion detector. ); And A unique identifier for identifying itself on a network, wherein a continuity counter and a unique identifier for indicating a sequence between the N GOPs of the compressed video data (where N is an unfixed value as an integer) and the N GOPs And / or a network IF unit 170 for transmitting a video compression file including attribute information of the compressed image data to a host system through a network. Network camera, characterized in that configured to include. delete delete delete delete Each of which has a unique identifier for identifying itself on a network connected to a predetermined network, and encodes the image data generated by capturing an object to a specific video compression using temporal video compression to generate compressed image data A video including N GOPs of video data (where N is an unfixed value as an integer) and a continuity counter for indicating a sequence between the N GOPs and attribute information on the unique identifier and / or the compressed video data. One or more network cameras 310: 1 to 310: n for transmitting a compressed file through the network; A multiple access modem for performing multiple-access to the one or more network cameras through time division or frequency division based on the unique identifier, and receiving the video compression file from the one or more network cameras; 340); Compressed video sequence for each network camera by separately sorting the video compressed file multiplexed from the one or more network cameras through the multiple access modem according to the unique identifier of the network camera and / or the continuity counter. Muxing / demux unit for providing 350; A display unit 360 which receives all or a portion of the aligned compressed video sequence from the muxing / demuxing unit, decompresses the video in GOP units, restores the image, and displays the image on a screen; And The data manager 370 receives all or a portion of the sorted compressed image sequence from the muxing / demuxing unit and records the recorded compressed image on a media that can be stored. Imaging system comprising a. delete delete delete delete delete 7. The method of claim 6, wherein the data management unit (370) reads the compressed video sequence from the recordable media, performs data conversion and format conversion for optimal reproduction, and then outputs the compressed video sequence; The muxing / demuxing unit 350 switches the output compressed image sequence to the display unit; The display unit 360 decompresses the moving image in the GOP unit for the transmitted compressed image sequence, and restores the image and displays the image on the screen. A specific still image compression using a specific video compression or spatial image compression using temporal video compression, each of which has a unique identifier for identifying itself on the network connected to a predetermined network, Selectively encode to generate compressed image data, detect the degree of external movement through a motion detector, and if the detected result is greater than a predetermined threshold, encode it with the still image compression; otherwise, encode with the video compression. In the case of the video compression, a continuity counter for indicating a sequence between the N GOPs (where N is an unfixed value as an integer) and the N GOPs of the compressed video data and attribute information for the unique identifier and the video compression Recalling a video compression file containing a One or more network cameras for transmitting the still image compression file through a network, the still image compression frame including one or more still image compression frames of the compressed image data and attribute information on the unique identifier and still image compression in the case of the still image compression ( 310: 1 to 310: n); Perform multiple-access on the one or more network cameras via time division or time division or frequency division based on the unique identifier, and from the one or more network cameras, the moving picture compression file and / or the still picture compression file. Receiving a multiple access modem 340; The compressed video sequence (410 to 430) for each of the network cameras is separated and sorted according to the unique identifier of the network camera and / or the continuity counter with respect to the moving picture compression file or the still picture compression file received through the multiple access modem. Provided muxing / demuxing unit 350; A display unit 360 receiving all or a portion of the aligned compressed image sequence from the muxing / demuxing unit, decompressing the still image compression or decompressing the moving image on a GOP basis, and restoring the image to display on the screen; And The data manager 370 receives all or a portion of the sorted compressed image sequence from the muxing / demuxing unit and records the recorded compressed image on a media that can be stored. Imaging system comprising a. delete delete An imaging unit 140 for photographing an object to generate uncompressed image data; An image data processor (150) for generating compressed image data by selectively encoding the moving image data using a specific video compression using temporal image compression or a specific still image compression using spatial image compression on the uncompressed image data; A motion detector for detecting the presence and degree of external movement; And A unique identifier for identifying itself on a network, and when the motion detector detects a degree of movement equal to or greater than a predetermined threshold, encodes the still image compression; otherwise, encodes the video compression; Video compression file including N GOPs (where N is an unfixed value as an integer) of the compressed image data and a continuity counter for indicating a sequence between the N GOPs and attribute information on the unique identifier and video compression Is transmitted to a host system through a network, and in the case of still picture compression, a still picture compression file including at least one still picture compression frame of the compressed image data and the unique identifier and attribute information about the still picture compression is transmitted to a host system through the network. Network IF section 170 to say Network camera, characterized in that configured to include.