KR102101507B1 - Method and Apparatus for Lossless Network Video Transmission - Google Patents

Abstract

An embodiment of the present invention relates to a method and apparatus for transmitting a lossless network image.
An embodiment of the present invention, the image transmitting apparatus, the process of receiving a captured image from the camera; Compressing the captured image to generate an encoded image; Receiving the encoded image and checking a transmission environment of the network to select internal storage or network transmission for the encoded image based on the identified network transmission environment; Transmitting video information including the encoded image using the network when the result of the selection is network transmission; And a step of storing the image information when the result of the selection is internal storage.

Description

Method and Apparatus for Lossless Network Video Transmission}

An embodiment of the present invention relates to a method and apparatus for transmitting a lossless network image. More specifically, in transmitting an image captured by an analog security camera through a network, a method and apparatus for transmitting a lossless network image to provide a seamless security environment by transmitting the image without losing the image according to the transmission environment of the network It is about.

The content described in this section merely provides background information for an embodiment of the present invention and does not constitute a prior art.

With the recent development of network technology, the demand for network cameras is also increasing in the field of video security, and the market size of network-based NVR (Network Video Recorder) products is also increasing in the case of security systems. Network cameras and NVRs are often used to build new security systems, but in the case of network security systems utilizing existing analog camera systems, video servers that receive images from the installed analog cameras and transmit them over the network (Video Server) You can also build a network security system by connecting the product to an analog camera.

In the field of video security where stability and uninterrupted video storage are important, when there are many users or network equipment such as hubs / routers fail, transmission is impossible due to deterioration of the network transmission environment or bandwidth that can be transmitted. (BW: Band Width) is lowered. When the network transmission environment is deteriorated as described above, the amount of data that can be transmitted through the corresponding network is reduced, and loss of images transmitted through the network may occur.

In order to solve this problem, in an embodiment of the present invention, in transmitting an image captured by an analog security camera through a network, a seamless security environment is performed by transmitting an image so that the image is not lost depending on the transmission environment of the network. The main purpose is to provide.

In addition, in the video transmission through the network, the purpose is to enable efficient network utilization by scheduling in consideration of the traffic of the network.

In order to achieve the above object, an embodiment of the present invention, a lossless image transmission apparatus, comprising: an image receiving unit for receiving a captured image from a camera; An encoding unit compressing the captured image to generate an encoded image; A network transmission control unit that receives the encoded image and checks a transmission environment of a network to selectively perform internal storage or network transmission on the encoded image based on the identified network transmission environment; An image storage unit that stores image information including the encoded image when internal storage is selected by the network transmission control unit; And an image transmission unit that transmits the image information using the network when network transmission is selected by the network transmission control unit.

When the photographed image is an analog image, the lossless image transmission apparatus converts the analog image to AD (Analog-to-Digital) to generate image data and transmits the image data to the encoder as a captured image to be compressed. It may further include a converter.

The image storage unit compares the size of the image information to be stored with the storage capacity remaining in the image storage unit, and when the size of the image information to be stored is greater than the remaining storage capacity, the image storage unit The oldest stored image information can be deleted sequentially.

The network transmission control unit controls the image information to be stored in the image storage unit when the network transmission environment is confirmed to be abnormal, and when the network transmission environment is normal, the image information stored in the image storage unit to the network. Can be transferred to.

The network transmission control unit may store image information including the received encoded image while transmitting the stored image information to the network.

The image information may include time stamp information corresponding to a time when the encoded image is generated.

The network transmission control unit may transmit the video information based on the traffic related data for each time zone of the network, and the network transmission control unit refers to the traffic related data for each time zone for a time zone in which the traffic of the network is below a threshold value. The video information may be transmitted, and even when the traffic of the network exceeds a threshold, the video information may be transmitted to the network when the size of the video information is less than or equal to a preset size.

In order to achieve the above object, an embodiment of the present invention is a method for transmitting a lossless image in an image transmission apparatus, the method comprising: receiving a captured image from a camera; Compressing the captured image to generate an encoded image; Receiving the encoded image and checking a transmission environment of the network to select internal storage or network transmission for the encoded image based on the identified network transmission environment; Transmitting video information including the encoded image using the network when the result of the selection is network transmission; And when the result of the selection is internal storage, storing the video information.

In the process of transmitting the video information, when the traffic of the network exceeds a threshold, when the size of the video information is equal to or less than a preset size, the video information may be transmitted to the network.

As described above, according to an embodiment of the present invention, in transmitting an image captured by an analog security camera or the like through a network, a seamless security environment is performed by transmitting an image so that an image is not lost depending on a transmission environment of the network. It has the effect of providing.

In addition, by scheduling the video transmission in consideration of the traffic of the network, it is possible to reduce network load and enable effective network management, thereby minimizing additional investment in connection with wireless or wired security services to enable effective network services.

1 is a block diagram briefly illustrating an apparatus for transmitting a lossless network video according to an embodiment of the present invention.
2 is a flowchart illustrating a method for transmitting a lossless network video according to an embodiment of the present invention.
3 is a flowchart illustrating a video information transmission process according to traffic by time zone of the network.

Hereinafter, this embodiment will be described in detail with reference to the accompanying drawings.

1 is a block diagram briefly illustrating an apparatus for transmitting a lossless network video according to an embodiment of the present invention.

As shown in FIG. 1, the apparatus 100 for lossless network video transmission according to an embodiment of the present invention includes an image receiving unit 110, an AD converter 120, an encoding unit 130, an image storage unit 140, and a network. It includes a transmission control unit 150 and the image transmission unit 160. In this embodiment, the lossless network image transmission apparatus includes an image receiving unit 110, an AD converter 120, an encoding unit 130, an image storage unit 140, a network transmission control unit 150, and an image transmission unit 160. However, it is not limited thereto, and some components may be omitted or other components may be added depending on the embodiment.

The image receiving unit 110 receives the captured image from the camera. The photographed image received by the image receiving unit 110 may be an analog image, or may be digital image data obtained by converting an analog image to digital according to an embodiment.

The AD converter 120 generates an image data by analog-to-digital (AD) conversion of the received analog image when the captured image received by the image receiving unit 110 is an analog image, and photographs to compress the generated image data It is transmitted to the encoder 130 as an image.

If the captured image received by the image receiving unit 110 is digital image data, the lossless network image transmission apparatus 100 according to an embodiment of the present invention may be implemented by omitting the AD converter 120.

The encoding unit 130 receives the digital image data (ie, digital image data) from the image receiving unit 110 or the AD converter 120 and compresses the received digital image data to generate an encoded image. The encoding unit 130 compresses the digital image data to reduce the data size to make it possible to transmit the image with a relatively small bandwidth. Here, as a method of compressing an image, various image encoding algorithms such as MPEG 4 and H.264 may be used, and the present invention is not limited thereto.

The image storage unit 140 stores image information including the encoded image generated by the encoding unit 130 under the control of the network transmission control unit 150.

The image transmission unit 160 transmits image information including the encoded image generated by the encoding unit 130 using the network 170 under the control of the network transmission control unit 150.

The network transmission control unit 150 receives the encoded image from the encoding unit 130 and checks the transmission environment of the network 170 to selectively perform internal storage or network transmission for the encoded image based on the identified network transmission environment. .

As a result of confirming the network transmission environment, the network transmission control unit 150 determines that the network 170 is an abnormal transmission environment in which it is difficult to normally transmit the encoded image due to a failure or overload, and the like. Is stored in the image storage 140.

For reference, the image storage unit 140 compares the size of the image information to be stored with the available storage capacity remaining in the image storage unit 140, and then the size of the image information to be stored is greater than the available storage capacity. In this case, an empty storage space is provided to store the image information to be stored by sequentially deleting the oldest image information previously stored in the image storage unit 140.

As a result of checking the network transmission environment, the network transmission control unit 150 transmits the image information stored in the image storage unit 140 to the network 170 when the network transmission environment changes from abnormal to normal. In this case, the coded image received while transmitting the image information previously stored in the image storage unit 140 to the network 170 is temporarily stored in the image storage unit 140 without being immediately transmitted to the network 170, and the image storage After the operation of transmitting the image information previously stored in the unit 140 to the network 170 is completed, it is transmitted to the network 170.

The network transmission control unit 150 controls the image transmission unit 160 when all of the image information pre-stored in the image storage unit 140 is transmitted through the network 170, and the network 170 receives the encoded image in real time. Transfer to.

The network transmission control unit 150 continuously checks the network transmission environment while transmitting the encoded image received in real time to the network 170, and controls the video transmission unit 160 while the network transmission environment maintains normality. The video information including the encoded video is continuously transmitted in real time through the network 170.

In the case of a general video server or an encoder that provides only a real-time transmission function, it is impossible to cope with the error situation of the network 170, so in the embodiment of the present invention, the network transmission control unit 150 checks the network transmission environment to obtain an image. When it is determined that the transmission is impossible, the temporary storage of the security image (ie, image information) in the internal memory area of the image storage unit 140, and when the network transmission environment is normalized, the temporarily stored image information is transmitted through the network 170. It can provide users with a stable and seamless security environment.

Meanwhile, the image information including the encoded image may include time stamp information corresponding to the time at which the encoded image was generated. An image control center server (not shown) that receives the encoded image transmitted from the lossless network image transmission apparatus 100 according to an embodiment of the present invention, is the transmitted encoded image in real time or a network transmission environment It is very likely that it is difficult to determine whether it is a video that is stored in this poor case and then transmitted after the network transmission environment returns to normal. In this case, if the time stamp information corresponding to the time when the coded image is generated is included in addition to the coded image to be transmitted, the image control center server (not shown) checks this timestamp information and the transmitted coded image is a real-time image. It is easy to check whether it is or not and at which point the image is generated.

The network transmission control unit 150 transmits video information through the network 170 based on traffic-related data for each time zone of the network 170. In the case of a day or a specific time period when the traffic of the network 170 is heavy, the image data is stored in the internal memory to reduce the overload of the network 170, and the load of the network 170 is transmitted by transmitting the image stored at a time or night when the traffic is low Efficient network 170 can be managed.

For example, the network transmission control unit 150 transmits the video information in a time zone in which the traffic of the network 170 is below a threshold by referring to the traffic related data for each time zone of the network 170 to which the video information is to be transmitted. Accordingly, the network transmission control unit 150 may limit the transmission of image information in a time period when the traffic of the network 170 exceeds a threshold value.

However, the network transmission control unit 150 may be implemented to transmit image information when some conditions are satisfied even when the traffic exceeds a threshold by referring to the traffic related data for each time zone of the network 170. That is, the network transmission control unit 150 sets a bit rate per unit time calculated from the average size per frame of image information and the number of frames per hour of image information, even when the traffic of the network 170 exceeds a threshold value. If the size is smaller than the size, it may be implemented to transmit image information through the network 170. In particular, when the bit rate per unit time of the video information compared to the available bandwidth of the network 170 is less than or equal to the preset rate (ie, the size of the video information is less than or equal to the preset size), the video information may be transmitted through the network 170. have.

For example, if the size of the encoded image encoding the image data (that is, the size of the image information) is very small, even if the encoded image is transmitted through the network 170, the traffic of the network 170 is very small, In this case, it may be more efficient in terms of security service to implement to transmit video information even in a time period when traffic exceeds a threshold. This is because, in the case where there is little human movement at night or in a place where a camera for acquiring a captured image is disposed, there is little change in image data between frames of the image. It is likely to be compressed at a high compression rate. Therefore, in this case, since the size of the encoded video is very small, it is possible to achieve the purpose of real-time monitoring a predetermined surveillance area by using the encoded video image while inducing minimal network traffic.

2 is a flowchart illustrating a method for transmitting a lossless network video according to an embodiment of the present invention.

2, in the method of transmitting a lossless network image according to an embodiment of the present invention, the image receiving unit 110 first receives the captured image from the camera (S210). AD converter 120, if the captured image received by the image receiving unit 110 is an analog image, converts the received analog image to AD to generate image data and compress the generated image data as a captured image 130 It is transmitted to (S220). If the captured image is digital image data, step S220 may be omitted. The encoding unit 130 receives digital image data from the image receiving unit 110 or the AD converter 120 and compresses the received digital image data to generate an encoded image (S230).

After receiving the encoded image, the network transmission control unit 150 checks whether the transmission environment of the network 170 is normal (S240).

As a result of checking in step S240, the network transmission control unit 150 determines image information including the received encoded image when it is determined that the network 170 is an abnormal transmission environment in which it is difficult to normally transmit the encoded image due to a failure or overload. It is stored in the image storage unit 140 (S250).

When it is determined in step S240 that the network 170 is in a normal state, the network transmission control unit 150 checks whether the image information previously stored in the image storage unit 140 is being transmitted to the network 170. (S260).

When it is determined in step S260 that the network transmission control unit 150 determines that the image information including the encoded image is being transmitted to the network 170, the network transmission control unit 150 transmits the image information including the received encoded image to the image storage unit 140. Save (S250).

The network transmission control unit 150 includes the encoded image received by controlling the image transmission unit 160 when it is determined in step S260 that the image information including the encoded image is not being transmitted to the network 170. The video information to be transmitted is transmitted to the network 170 (S270).

On the other hand, when the image information including the received encoded image is stored in the image storage unit 140, the network transmission control unit 150 periodically or at a preset time to determine whether the network transmission environment is normal (S280). If it is determined in step S240 that the network transmission environment is not normal, the process proceeds to step S280 to check whether the network transmission environment is normal. If, as a result of checking in step S280, it is determined that the network transmission environment is normal, the image information including the encoded image stored in the image storage unit 140 is controlled to transmit the image information to the network 170 by controlling the image transmission unit 160. (S270).

The video information transmitted to the network 170 may be received and stored by a video control center server (not shown) (S290) and used for security control.

3 is a flowchart illustrating a video information transmission process according to traffic by time zone of the network 170.

In step S270 of FIG. 2, one condition may be further referenced before transmitting the image information to the network 170. The network transmission control unit 150 may transmit the video information in a time zone in which the traffic is below a threshold by referring to the traffic related data for each time zone of the network 170 to which the video information is to be transmitted. The network transmission control unit 150 determines whether the current time is a time zone in which network traffic is below a threshold (S310).

As a result of checking in step S310, when it is determined that the current time is not a time zone in which network traffic is below a threshold, the network transmission control unit 150 stores the image information including the received encoding information in the image storage unit 140 ( S320). In step S320, if a process of determining whether to transmit predetermined image information pre-stored in the image storage unit 140 to the network 170 is in progress, the pre-stored predetermined image information is stored in the image storage unit 140. Keep it.

If, as a result of checking in step S310, it is determined that the current time is a time zone in which the network traffic is below a threshold, the network transmission control unit 150 transmits the video information including the encoded information to the network 170 (S330). .

The network transmission control unit 150 checks whether the current time is a schedulable time (ie, a time zone in which traffic is below a threshold) even after storing the image information including the encoding information in the image storage unit 140 (S340). . If, as a result of checking in step S340, it is confirmed that the current time is not a schedulable time, the process continues to step S340 to check whether the current time is a schedulable time.

If, as a result of checking in step S340, it is confirmed that the network transmission environment is normal, the network transmission control unit 150 controls the image transmission unit 160 to control the image information including the encoded image stored in the image storage unit 140 It transmits to the network 170 (S330).

The video information transmitted to the network 170 may be received and stored by a video control center server (not shown) (S350) and used for security control.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the claims below, and all technical spirits within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

As described above, the present invention has an effect of providing a seamless security environment by transmitting an image without losing an image according to the transmission environment of the network in transmitting an image captured by an analog security camera through a network. It is an invention.

100: lossless network video transmission device
110: video receiver 120: AD converter
130: encoding unit 140: image storage unit
150: network transmission control unit 160: video transmission unit
170: network

Claims (13)

In the lossless video transmission device,
An image receiving unit that receives the captured image from the camera;
An encoding unit compressing the captured image to generate an encoded image;
A network transmission control unit that receives the encoded image and checks a transmission environment of a network to selectively perform internal storage or network transmission on the encoded image based on the identified network transmission environment;
An image storage unit that stores image information including the encoded image when internal storage is selected by the network transmission control unit; And
When network transmission is selected in the network transmission control unit, an image transmission unit that transmits the image information using the network
Including,
The network transmission control unit,
Lossless video transmission characterized in that the video information is transmitted based on traffic-related data for each time zone of the network, and the video information is transmitted during a time when the traffic of the network is below a threshold by referring to the traffic-related data for each time zone. Device.
◈ Claim 2 was abandoned when payment of the registration fee was set.◈ According to claim 1,
When the captured image is an analog image,
The lossless image transmission apparatus further comprises an AD converter that converts the analog image to analog-to-digital (AD) to generate image data and transmits the image data to the encoder as a captured image to be compressed. Lossless video transmission device.
◈ Claim 3 was abandoned when payment of the set registration fee was made.◈ According to claim 1, wherein the image storage unit,
After comparing the size of the image information to be stored with the storage capacity remaining in the image storage unit, if the size of the image information to be stored is larger than the remaining storage capacity, the oldest image information stored in the image storage unit Lossless video transmission device, characterized in that sequentially deleted from.
According to claim 1, The network transmission control unit,
When the network transmission environment is confirmed to be abnormal, the image information is controlled to be stored in the image storage unit, and when the network transmission environment is normal, the image information stored in the image storage unit is transmitted to the network. Lossless video transmission device.
The method of claim 4, wherein the network transmission control unit,
Lossless image transmission device, characterized in that while transmitting the stored image information to the network, the image information including the received encoded image is stored in the image storage unit.
◈ Claim 6 was abandoned when payment of the registration fee was set.◈ The method of claim 5, wherein the video information,
And a timestamp information corresponding to the time at which the coded image is generated.
delete delete ◈ Claim 9 was abandoned when payment of the set registration fee was made.◈ According to claim 1, The network transmission control unit,
Lossless video transmission device characterized in that when the traffic of the network exceeds a threshold value, the video information is transmitted to the network when the size of the video information is less than or equal to a preset size.
In the method of transmitting a lossless image in the video transmission device,
Receiving a photographed image from a camera;
Compressing the captured image to generate an encoded image;
Receiving the encoded image and checking a transmission environment of the network to select internal storage or network transmission for the encoded image based on the identified network transmission environment;
Transmitting video information including the encoded image using the network when the result of the selection is network transmission; And
The process of storing the image information when the result of the selection is internal storage.
Including,
The process of transmitting the video information,
A lossless video transmission method characterized in that the video information is transmitted in a time zone in which the traffic of the network is less than or equal to a threshold by referring to the traffic related data for each time zone of the network.
◈ Claim 11 was abandoned when payment of the set registration fee was made.◈ The method of claim 10,
The image information includes timestamp information corresponding to a time when the encoded image is generated.
delete 11. The method of claim 10, The process of transmitting the video information,
When the traffic of the network exceeds a threshold, when the size of the video information is less than or equal to a preset size, the video information is transmitted to the network.

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