KR101103689B1 - System and method for raising effective velocity of changing channel by providing i-frame during channel changing time - Google Patents

System and method for raising effective velocity of changing channel by providing i-frame during channel changing time Download PDF

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Publication number
KR101103689B1
KR101103689B1 KR1020080121976A KR20080121976A KR101103689B1 KR 101103689 B1 KR101103689 B1 KR 101103689B1 KR 1020080121976 A KR1020080121976 A KR 1020080121976A KR 20080121976 A KR20080121976 A KR 20080121976A KR 101103689 B1 KR101103689 B1 KR 101103689B1
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South Korea
Prior art keywords
still image
channel
original still
original
user terminal
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KR1020080121976A
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Korean (ko)
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KR20100063458A (en
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박준우
정상현
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주식회사 케이티
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/234Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs
    • H04N21/2343Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements
    • H04N21/234336Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements by media transcoding, e.g. video is transformed into a slideshow of still pictures or audio is converted into text
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
    • H04N21/2362Generation or processing of Service Information [SI]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/25Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
    • H04N21/266Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel

Abstract

A system for extracting an original still image of a channel at predetermined time intervals and providing the original still image to a user terminal preferentially when changing a channel extracts an original still image of each channel at a predetermined time interval, and extracts the extracted original still image. A still image extraction server for generating an original still image index file by mapping each channel information to a channel information, and a central transmission server for transmitting the broadcast image for each channel and the generated original still image index file to a user terminal. Still image index files are always transmitted and buffered to the user terminal through a separate channel.
Original Still Image, IPTV, Multicast

Description

SYSTEM AND METHOD FOR RAISING EFFECTIVE VELOCITY OF CHANGING CHANNEL BY PROVIDING I-FRAME DURING CHANNEL CHANGING TIME}

The present invention relates to a system and a method for increasing the channel changing rate by providing an original still image and program information during a channel change time, and more particularly, during a waiting time until a broadcast screen of a new channel is displayed. The present invention relates to a system and a method for reducing haptic waiting time by providing a user with an original still image and a corresponding program information of a very short time immediately before the channel stored in the present invention.

The broadcast screen currently being played on IPTV uses the MPEG-based compression scheme. In order to improve the compression efficiency of the broadcast screen, most broadcasts require a single still image (I-frame) between the original still image and the original still image. The changed parts of the original still image are extracted to provide various pieces of variable image information (P-frame or B-frame). In addition, if there is no original still image for the new channel, the variable image information cannot be utilized, and waits until the original still image is received, and then displays a broadcast screen for the new channel from when the original still image is received.

When a user requests a channel change in an existing IPTV, unlike a satellite broadcast or a cable broadcast, a broadcast screen of a new channel requesting a change is not immediately played on the user terminal. Because of the nature of the MPEG-based compression scheme, all channels must start from the original still image (I-frame), because it takes time to receive and search for the original still image for the new channel that the user has requested to change. .

FIG. 1 is a flowchart of a general procedure until a broadcast screen of a new channel is displayed on a user terminal when a user requests a channel change.

As shown in FIG. 1, in the channel changing method of the existing IPTV, a user terminal receives a channel change request from a user, requests a multicast join (JOIN) to the corresponding channel, and receives traffic of the multicast channel. And receiving and detecting the original still image corresponding to the I-frame in the received traffic, and reproducing the broadcast screen in the terminal to reproduce the broadcast screen in the user terminal. It is not a big problem after the user requests JOIN to the multicast channel and receives the traffic of the multicast channel because the user hardly feels the waiting time, but after receiving the traffic, the user terminal receives and detects the I-frame. It takes a long time to do it.

When the user requests a channel change, the user must go through the process of searching for the original still image for the new channel, which generally takes about 2 sec. This amount of time can be annoying for users who are in a hurry. In addition, during the waiting time, most broadcasts only display the message “Ready to receive.” Such as on the screen, so that users can feel the channel changing speed slower.

On the other hand, as the first prior art, Korean Patent Registration No. 10-0851634 discloses an invention entitled "a method and system for streaming a live multimedia stream in a pull" method, and transmits an I-frame from a streaming server. The present invention relates to a technology for quickly reproducing a broadcast screen when a channel is changed by requesting an I-frame transmission request to the buffering server in a pull method when the channel is changed and stored in the buffering server.

However, since the above-described first prior art needs to make an I-frame transmission request to the buffering server in a pull manner, there is a problem that a delay occurs in time until the I-frame is requested and received. In addition, since a buffering server must be provided for every channel and a transport channel must be secured for each local node, there is a problem in that a high cost is required. In addition, since the I-frame buffered in the buffering server is an I-frame having a certain time difference from the broadcast screen currently being broadcast in real time, when the broadcast screen is played after the reception of the I-frame is completed, Continuity could not be guaranteed. In addition, when the streaming server and the buffering server are synchronized to improve the continuity of the screen, they are synchronized to the past point of time as a whole, and have to provide the same broadcast screen later than satellite broadcasting or cable broadcasting.

On the other hand, as a second prior art, Korean Patent Publication No. 2008-0055280 discloses an invention entitled "Additional Information Providing Device, Method Using IPTV Channel Search Time, and Recording Media Recording the Method", The channel change request signal is transmitted to the external local distribution station system through the network, and the additional information stored in the memory of the set-top box (STB) is transferred to the IPTV until the video signal of the changed channel is received from the local distribution station. It is about a technique to output.

However, the above-described second prior art does not show the I-frame for the change channel, but provides only the title image or program guide information of the channel program, so as to know what scene is currently coming from the channel where the user has requested a change. It couldn't meet the needs of users who wanted to, and it couldn't help to speed up channel changes.

In particular, for the user who habitually moves channels and checks which scenes are output for each channel and selects a program to watch, the above-described second prior art cannot achieve the desired purpose.

An embodiment of the present invention provides a system and method for extracting an original still image of a channel at predetermined time intervals, and preferentially providing the original still image to a user terminal when a channel is changed.

As a technical means for achieving the above-described technical problem, the first aspect of the present invention is to extract the original still image of each channel at a predetermined time interval, the original still image index by matching the extracted original still image with each channel information A still image extraction server for generating a file, and a central transmission server for transmitting the broadcast image for each channel and the generated original still image index file to a user terminal, wherein the original still image index file is transmitted through a separate channel. A system for extracting an original still image of a channel at a predetermined time interval that is always transmitted and buffered to a user terminal may be provided, and a system for preferentially providing the original still image to a user terminal when a channel is changed.

In addition, the second aspect of the present invention is the step of receiving a broadcast image from the broadcast server, extracting the original still image of each channel at a predetermined time interval, and corresponds to the extracted original still image with each channel information, the original still image Generating an index file and always transmitting the original still image index file to a user terminal through a predetermined channel separately from a broadcast video channel, wherein the original still image index file is buffered in the user terminal. It is possible to provide a method of extracting an original still image of a channel at predetermined time intervals and providing the original still image to a user first when a channel is changed.

In addition, a third aspect of the present invention provides a method for receiving a channel change request, requesting a multicast join for the change requested channel and receiving traffic, an original still image of each channel through an always-maintained channel, and a corresponding channel. Receiving and buffering an original still picture index file including channel information and an original still picture corresponding to the requested change channel from the buffered original still picture index file until an I-frame of the requested channel is detected. A method of providing a user with an original still image corresponding to a channel for which the change is requested may be provided until a broadcast for the channel for which the change is requested is reproduced.

According to the above-described problem solving means of the present invention, when the channel is changed, before the broadcast screen for the new channel is displayed, by providing the user with the original still image or program information immediately before the very short time for the new channel, You can increase the rate of channel changes.

In addition, according to the aforementioned problem solving means of the present invention, when the user attempts to change the channel continuously for the purpose of channel movement, by providing the original still images stored in the user terminal continuously, real-time broadcasting per channel to the user Intuitive status can be provided.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is "connected" to another part, this includes not only "directly connected" but also "electrically connected" with another element in between. . In addition, when a part is said to "include" a certain component, which means that it may further include other components, except to exclude other components unless otherwise stated.

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

2 is a schematic diagram of a system for extracting an original still image of a channel and providing the original still image to a user terminal when a channel is changed according to an embodiment of the present invention.

As shown in FIG. 2, a system for extracting an original still image of a channel according to an embodiment of the present invention and providing the original still image to a user terminal when a channel is changed is a broadcast transmission server 100 and a still image. The extraction server 200, the central transmission server 300, the network 400 and the user terminal 500 is included.

The broadcast transmission server 100 may transmit broadcast images for all channels currently being broadcast to the still image extraction server 200 and the central transmission server 300 in a streaming manner.

The still image extraction server 200 may extract an original still image (eg, an I-frame) from the broadcast images for all the received channels, and generate the original still image index file by associating this with the channel information. . Also, the still image extraction server 200 may transmit the original still image and the original still image index file to the central transmission server 300.

The central transmission server 300 receives broadcast images for all channels currently being broadcast from the broadcast transmission server 100 and receives original still image index files for all channels from the still image extraction server 200. Can be. The central transmission server 300 may transmit the received broadcast image and the original still image index file to the user terminal 500 via the network 400.

In this case, the central transmission server 300 may simultaneously transmit the received broadcast image and the original still image index file to the plurality of user terminals 500 in a multicast streaming manner.

Also, the central transmission server 300 may transmit the original still image index file to the plurality of user terminals 500 through a separate channel instead of a transmission channel of the broadcast image. For example, the central transmission server 300 may transmit an original still image index file by allocating a portion of the bandwidth used when transmitting the broadcast image. Since the data amount of the original still image index file is very small compared to the broadcast image, even if a predetermined bandwidth is always allocated and transmitted to the user terminal 500, the quality of the broadcast image does not affect.

The user terminal 500 receives the broadcast image and the original still image index file from the central transmission server 300, and buffers the received original still image index file. The user terminal 500 may always access a separate channel through which the original still image index file is transmitted from the central transmission server 300, and may update the original still image for all channels at very short intervals.

In addition, the user terminal 500 refers to the channel information of the channel requested by the user during the channel change time, and the program information of the original still image of the channel displayed on the current screen together with the time information from the previously received program guide file. May be read and provided to the user in combination with the original still image for the channel that the user has requested to change.

Therefore, according to a system for extracting an original still image of a channel according to an embodiment of the present invention and providing the original still image to a user terminal when a channel is changed, the original still image for a very short time is extracted for all channels. After storing the information in the user terminal and requesting a channel change, the stored original still image and the program information are provided to the user for a time until the broadcast screen of the new channel is played, thereby increasing the user's haptic channel change speed. .

3 is a detailed block diagram of the still image extraction server 200 according to an embodiment of the present invention.

As shown in FIG. 3, the still image extracting server 200 according to an embodiment of the present invention includes a broadcast image receiving unit 210, a still image extracting unit 220, a still image file generating unit 230, and a still image. The transmitter 240 is included.

The broadcast image receiver 210 may receive broadcast images of all channels currently being broadcast from the broadcast transmission server 100. Since the still image extraction server 200 is always connected to the broadcast transmission server 100, the broadcast image receiver 210 may receive broadcast images of all channels currently being broadcast in real time.

The still image extractor 220 may extract an original still image from broadcast images for all channels received by the broadcast image receiver 210, and collect the extracted original still images to generate an original still image extraction file. In addition, the generated original still image extraction file may be transmitted to the still image file generator 230. For example, when the broadcast image for each channel comes in through the broadcast image receiver 210, the still image extractor 220 extracts an original still image for each channel at a predetermined time interval, and includes only original still images for each channel. An MPEG-2 type image file may be generated and transmitted to the still image file generator 230.

A process of extracting the original still image from the broadcast image by the still image extractor 220 will be described in detail with reference to FIG. 4.

4 is a diagram illustrating an example of a process of extracting an original still image from a broadcast image by the still image extraction server 200 according to an embodiment of the present invention.

As shown in FIG. 4, the broadcast image received by the broadcast image receiver 210 may be transmitted to the still image extractor 220. The broadcast video is composed of many frames. In the frame illustrated in FIG. 4, "I" means original still image (I-frame), and "B" or "P" means variable image information (B-frame or P-frame). The still image extracting unit 220 may extract only the original still image from the broadcast image for all channels during a very short extraction time interval. For example, the still image extracting unit 220 may extract the original still image at intervals of 1 second to 2 seconds and update the latest original still image. In addition, the still image extracting unit 220 may generate and store an image file consisting of only the extracted original still images.

3, the still image file generator 230 receives an original still image extracting file from the still image extracting unit 220, and manages original still images extracted by the still image extracting unit 220. You can create still image index files.

A process of generating the original still image index file by the still image file generator 230 will be described in detail with reference to FIG. 5.

5 is an exemplary diagram of an original still image index file generated by the still image file generator 230 according to an exemplary embodiment.

As shown in FIG. 5, the still image file generator 230 assigns a PID (Process Identifier) value to each still image, records the relationship between each channel information and the PID in the file header, and generates an original still image index file. Can be formed. For example, the still image file generator 230 manages an original still image for each channel for each PID in the form of managing MPEG for each channel in MPEG2. The relationship between the information and the PID can be described, and the PID value can be recorded for each original still image.

3, the still image transmitter 240 may transmit the original still image index file generated by the still image file generator 230 to the central transmission server 300.

6 is a diagram illustrating a method of storing an original still image for each channel in the user terminal 500 according to an exemplary embodiment of the present invention.

The user terminal 500 may receive a broadcast image and an original still image index file from the central transmission server 300, and store the received original still image index file. The user terminal 500 may always access a separate channel through which the original still image index file is transmitted from the central transmission server 300, and may update the original still image for all channels at a very short time interval.

The memory of the user terminal 500 may not have enough capacity to store original still images for all channels updated at very short time intervals. Accordingly, when the user terminal 500 receives the latest original still image in a limited memory, the user terminal 500 may store the original still image in such a manner that the original still image that is already stored by the excess capacity is deleted. For example, if an original still image for channel n through channel 1 is already stored in the memory of the user terminal 500, and the memory capacity of the user terminal 500 is insufficient to store a new original still image, When the original still image for channel 1 is received, the user terminal 500 overwrites the new original still image for channel 1 with the memory area in which the original still image for channel 1 is stored. You can save a new original still image for.

7 is a signal flow diagram illustrating a method for transmitting an extracted original still image for each channel to a user terminal according to an embodiment of the present invention.

As shown in FIG. 7, in step S710, the broadcast transmission server 100 transmits broadcast images of all channels currently broadcast in a streaming manner to the still image extraction server 200 and the central transmission server 300. Can transmit Since the still image extraction server 200 and the central transmission server 300 are always connected to the broadcast transmission server 100, the still image extraction server 200 and the central transmission server 300 are currently in real time. It is possible to receive broadcast images for all channels being broadcast.

In operation S720, the still image extractor 220 may extract an original still image for each channel from broadcast images for all channels received by the broadcast image receiver 210.

In operation S730, the still image extractor 220 may generate an original still image extraction file including only original still images for each channel extracted in operation S720, and transfer the extracted still image file to the still image file generator 230. . For example, when the broadcast image for each channel is received through the broadcast image receiver 210, the still image extractor 220 extracts an original still image for each channel at a predetermined time interval, and the MPEG2 includes only original still images for each channel. The image file may be generated and transmitted to the still image file generator 230.

In operation S740, the still image file generator 230 receives the original still image extracting file from the still image extracting unit 220, and controls the original still image to manage the original still images extracted by the still image extracting unit 220. An image index file can be created. For example, the still image file generator 230 may assign a PID value to each still image and record a relationship between channel information and PID in the file header to form an original still image index file.

In operation S750, the still image transmitter 240 may transmit the original still image index file generated by the still image file generator 230 to the central transmission server 300 in operation S740.

In operation S760, the central transmission server 300 may transmit the broadcast image and the original still image index file received in operation S750 to the user terminal 500 via the network 400.

In operation S760, the central transmission server 300 may simultaneously transmit the received broadcast image and the original still image index file to the plurality of user terminals 500 in a multicast streaming manner.

In operation S760, the central transmission server 300 may transmit the original still image index file to the plurality of user terminals 500 through a separate channel instead of the transmission channel of the broadcast image. For example, the central transmission server 300 may transmit an original still image index file by allocating a portion of the bandwidth used when transmitting the broadcast image.

In operation S770, the user terminal 500 may buffer the original still image index file received in operation S760. The user terminal 500 may always access a separate channel through which the original still image index file is transmitted from the central transmission server 300, and may update the original still image for all channels at a very short time interval.

In addition, the memory of the user terminal 500 may not have enough capacity to store the original still image for all channels updated at very short time intervals. Accordingly, the user terminal 500 may store the original still image in a limited memory in such a manner as to continuously overwrite the latest original still images.

8 is a signal flowchart of a method of extracting an original still image of a channel and providing an original still image to a user terminal when a channel is changed according to an embodiment of the present invention.

From step S810 to step S850, the still image extraction server 200 receives the broadcast image to generate an original still image index file, and the user terminal 500 transmits the original still image through the central transmission server 300. Receiving an index file and storing it in memory. Since this has been described above with reference to FIG. 7, a detailed description thereof will be omitted.

Step S860 is a step in which the user terminal 500 receives a channel change request from the user and requests a multicast join (JOIN) for a new channel from the central transmission server 300. In addition, in step S860, the user terminal 500 receives the traffic of the JOIN new channel from the central transmission server 300, and waits until the original stop image is received from the received traffic. .

In operation S870, the user terminal 500 may extract an original still image of a very short time immediately before a new channel requested by the user from the original still image index file stored in operation S850. In addition, the user terminal 500 refers to the channel information of the channel requested by the user to change the program of the original still image of the channel displayed on the current screen together with time information from the program guide file stored in the user terminal 500. You can read the information. Thereafter, the user terminal 500 may combine the read program information with the original still image immediately before a very short time for the new channel, and display the same on the screen.

In operation S880, the user terminal 500 may receive an original still image for a new channel from the traffic received in operation S860. Furthermore, after the user terminal 500 completes reception of the original still image for the new channel from the traffic, in step S870, the original still image is extracted from the original still image index file in a very short time immediately before. The operation of displaying on the screen together with the program information may be stopped, and the broadcast screen may be displayed from the original still image received from the traffic.

9 is a flowchart illustrating a method for displaying a broadcast screen for a new channel after the user terminal 500 receives a channel change request according to an embodiment of the present invention.

As shown in FIG. 9, in step S910, the user terminal 500 may receive a channel change request from the user.

In operation S920, the user terminal 500 may request a multicast join (JOIN) from the central transmission server 300 for a new channel that the user requests to change.

In operation S930, the user terminal 500 may receive traffic of the joined new channel from the central transmission server 300 and wait until the original still image is received from the received traffic.

In operation S940, the still image extraction server 200 receives a broadcast image of all channels currently being broadcast in a streaming manner from the broadcast transmission server 100, and for each channel from the broadcast images for all the received channels. You can extract the original still image. In addition, the still image extraction server 200 may generate an original still image index file for managing the extracted original still image.

In operation S950, the still image extraction server 200 may transmit the original still image index file generated in operation S940 to the central transmission server 300 to transmit the original still image index file to the user terminal 500. In operation S950, the central transmission server 300 may access the network 400 from the broadcast image received from the broadcast transmission server 100 and the original still image index file received from the still image extraction server 200. It may transmit to the user terminal 500 via.

In this case, the central transmission server 300 may simultaneously transmit the received broadcast image and the original still image index file to a plurality of user terminals 500 by using a separate channel in a multicast streaming scheme.

In operation S950, the user terminal 500 may store an original still image index file received from the central transmission server 300. The user terminal 500 may always access a separate channel through which the original still image index file is transmitted from the central transmission server 300, and may update the original still image for all channels at very short intervals.

In operation S960, the user terminal 500 refers to channel information about a channel for which the user requests a change, and the original source of the channel displayed on the current screen together with time information from a program guide file stored in the user terminal 500. Program information of still images can be read.

In operation S970, the user terminal 500 may extract an original still image of a very short time immediately before a new channel requested by the user from the original still image index file stored in operation S950. In addition, the user terminal 500 may combine the program information for the new channel read in step S960 with the original still image immediately before the new channel, and then display it on the screen.

The step S930 and the step S970 may be performed at the same time. In other words, while waiting to receive the original still image from the traffic for the new channel, by providing the original still image and the program information just before a very short time, the haptic channel change rate can be increased.

Step S980 is a step in which the user terminal 500 receives an original still image from traffic for a new channel and determines whether to display a broadcast screen for the new channel. Since the broadcast screen can be reproduced from the original still image, if the user terminal 500 does not receive the original still image from the traffic, the user terminal 500 may maintain the original still image reception standby state. In addition, the user terminal 500 may return to the step S970 to provide the user with the original still image and program information immediately before a very short time.

In operation S990, when the user terminal 500 receives an original still image for a new channel from traffic, the user terminal 500 plays a broadcast screen for the new channel. Furthermore, when the user terminal 500 completes reception of the original still image from the traffic, and reproduces the broadcast screen for the new channel, the user terminal 500 extracts the original still image just before the very short time from the original still image index file. In addition, the operation that was displayed on the screen along with the program information can be stopped.

One embodiment of the present invention can also be implemented in the form of a recording medium containing instructions executable by a computer, such as a program module executed by the computer. Computer readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media. In addition, computer readable media may include both computer storage media and communication media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Communication media typically includes computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave, or other transmission mechanism, and includes any information delivery media.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

1 is a flowchart of a general procedure until a broadcast screen of a new channel is displayed on a user terminal when a user requests a channel change.

2 is a schematic diagram of a system for providing an original still image to a user terminal when changing a channel according to an embodiment of the present invention.

3 is a detailed configuration diagram of a still image extraction server according to an embodiment of the present invention.

4 is a diagram illustrating an example of a process of extracting an original still image from a broadcast image by a still image extraction server according to an embodiment of the present invention;

5 is an exemplary diagram of an original still image index file generated by a still image file generator according to an exemplary embodiment of the present invention.

6 is a diagram illustrating a method of storing an original still image for each channel in a user terminal according to an embodiment of the present invention.

7 is a signal flow diagram illustrating a method for transmitting an extracted original still image for each channel to a user terminal according to an embodiment of the present invention.

8 is a signal flowchart of a method of extracting an original still image of a channel and providing an original still image to a user terminal when a channel is changed according to an embodiment of the present invention;

9 is a flowchart illustrating a method for displaying a broadcast screen for a new channel after a user terminal receives a channel change request according to an embodiment of the present invention.

Claims (10)

  1. In the system for extracting the original still image of the channel at a predetermined time interval, and provides the original still image preferentially to the user terminal when changing the channel,
    A still image extraction server which extracts an original still image of each channel at predetermined time intervals and generates an original still image index file by matching the extracted original still image with each channel information;
    And a central transmission server for transmitting the broadcast image for each channel and the generated original still image index file to a user terminal.
    And the original still image index file is always transmitted to the user terminal through a separate channel and is buffered.
  2. The method of claim 1,
    The still image extraction server includes a broadcast image receiving unit for receiving a broadcast image from a broadcast transmission server;
    A still image extracting unit which extracts an original still image for each channel from the received broadcast image at predetermined time intervals and generates an original still image extracting file consisting of only the extracted original still images;
    A still image file generator for generating an original still image index file by linking each channel information with the extracted original still image;
    Still image file transmission unit for transmitting the generated original still image index file to the central transmission server
    System for providing an original still image to the user terminal when changing the channel to include.
  3. The method of claim 1,
    The central transmission server is a system for providing an original still image to the user terminal when the channel is changed to transmit the broadcast image and the original still image index file for the channel to the user terminal in the form of multicast streaming.
  4. The method of claim 1,
    The original still image index file is formed by assigning a PID (Process Identifier) value to each still image and recording the relationship between each channel information and the PID value in a file header. System to provide.
  5. The method of claim 1,
    The channel information is used to provide the program information of the original still image of the channel displayed on the current screen with the time information, the system for providing the original still image to the user terminal when changing the channel.
  6. In the method of extracting the original still image of the channel at a predetermined time interval, and providing the original still image preferentially to the user when changing the channel,
    Receiving a broadcast image from a broadcast transmission server,
    Extracting an original still image of each channel at a predetermined time interval, and generating an original still image index file by matching the extracted original still image with each channel information; and
    And always transmitting the original still image index file to a user terminal through a predetermined channel separately from a broadcast video channel.
    And the original still image index file is buffered in the user terminal.
  7. The method of claim 6,
    Always transmitting the original still picture index file to a user terminal in a multicast streaming form.
  8. The method of claim 6,
    The original still image index file is provided by assigning a PID (Process Identifier) value to each still image and recording the relationship between the channel information and the PID in the file header to provide the original still image to the user. Way.
  9. A method for providing a user with an original still image corresponding to a channel for which a change is requested until a broadcast of a channel for which a change is requested is reproduced,
    Receiving a channel change request,
    Requesting a multicast join for the change requested channel and receiving traffic;
    Receiving and buffering an original still image index file including the original still image of each channel and corresponding channel information through the always-maintained channel; and
    Outputting an original still picture corresponding to the requested channel from the buffered original still picture index file until an I-frame of the requested channel is detected;
    Method for providing a user with an original still image comprising a.
  10. The method of claim 9,
    And extracting the program information of the original still image from the program guide file based on the channel information and the channel change request time, and outputting the program information.
KR1020080121976A 2008-12-03 2008-12-03 System and method for raising effective velocity of changing channel by providing i-frame during channel changing time KR101103689B1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050035071A (en) * 2003-10-10 2005-04-15 마이크로소프트 코포레이션 Fast channel change
KR20080064058A (en) * 2007-01-03 2008-07-08 삼성전자주식회사 Method for channel switching and apparatus for performing the method
KR20080069035A (en) * 2007-01-22 2008-07-25 삼성전자주식회사 Ip settop box for reducing zapping time and method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050035071A (en) * 2003-10-10 2005-04-15 마이크로소프트 코포레이션 Fast channel change
KR20080064058A (en) * 2007-01-03 2008-07-08 삼성전자주식회사 Method for channel switching and apparatus for performing the method
KR20080069035A (en) * 2007-01-22 2008-07-25 삼성전자주식회사 Ip settop box for reducing zapping time and method thereof

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