KR100703401B1 - Electronic program guide method and apparatus using captured still image of digital multimedia broadcasting - Google Patents

Abstract

The present invention relates to a method and apparatus for displaying an electronic program guide to select a desired program of a digital broadcasting system. The still image generating unit captures a still image from broadcast data of each broadcast program, and combines the captured still image with electronic program guide (EPG) data for each broadcast program to store it in a memory unit. The captured still image is displayed with the EPG data. The present invention saves the transmission resources of EPG data, and provides the user with a captured video screen which is currently transmitted in a broadcast channel, rather than a fixed video generated in advance, to help the user's channel selection more directly. To provide.

DMB, EPG, STILL IMAGE

Description

Electronic program guiding method and device using still image of digital multimedia broadcasting {ELECTRONIC PROGRAM GUIDE METHOD AND APPARATUS USING CAPTURED STILL IMAGE OF DIGITAL MULTIMEDIA BROADCASTING}

1 is a block diagram illustrating a digital broadcasting system for providing broadcasting and EPG data according to an embodiment of the present invention.

2 is a block diagram illustrating a communication system for transmitting and receiving broadcast and EPG data according to another embodiment of the present invention.

3 illustrates an example of EPG data according to a preferred embodiment of the present invention.

4 is a block diagram showing the configuration of a portable terminal capable of receiving digital broadcasting according to a preferred embodiment of the present invention.

5 shows an example of display of received EPG data.

6 is a block diagram showing a configuration of an apparatus for generating a still image of broadcast data according to a preferred embodiment of the present invention.

7A and 7B illustrate an example of storing still images according to a preferred embodiment of the present invention.

8A to 8C illustrate examples of EPG screens according to preferred embodiments of the present invention.

9 is a flowchart illustrating an electronic program guide operation according to a preferred embodiment of the present invention.

10 is a block diagram of a multi-channel video receiver using one video decoder in accordance with a preferred embodiment of the present invention.

11 is a flowchart illustrating an operation of outputting a guide of a next broadcast program during reception of a broadcast program according to a preferred embodiment of the present invention.

12 is a flowchart illustrating an operation of capturing a still image during reception of a broadcast program according to a preferred embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic program guide (hereinafter referred to as EPG), and more particularly, to a method and apparatus for displaying an electronic program guide and a still image so that a desired program of a digital broadcasting system can be selected. .

The Electronic Program Guide (EPG) service is proposed to provide online channel information, program title, broadcast time / date and other detailed information of programs that a user can receive. The user can use the EPG service while watching the desired program at the same time or to select the desired program.

Data containing program information for the EPG service, that is, EPG data, is transmitted to the user through the same medium or other medium as the broadcast programs themselves. In digital broadcasting systems, such as Digital Multimedia Broadcasting (DMB), which has recently been introduced, EPG data includes information related to programs that can be transmitted in each of the broadcast channels for a predetermined period. For example, the EPG data may include information about broadcast programs during the next hour, next several hours, day, week, and the like. That is, the EPG data represents titles and simple features of broadcast programs being transmitted for each channel by time zone.

The EPG data may be transmitted in the same band as the broadcast channel through which the program is transmitted, or may be transmitted in an out-band different from the broadcast channel through which the program is transmitted. Alternatively, the EPG data may be transmitted using the other communication function for a terminal having another communication function such as code division multiple access (CDMA) and orthogonal frequency division multiplexing (OFDM) together with a digital broadcasting service function.

The terminal receives the EPG data and stores it in an internal memory or a file system, and the user searches for the EPG data and selects a broadcast program to be watched. Typically, the EPG information is text-based and is configured to provide the user with only a title or a brief summary of the broadcast programs. However, the user cannot easily recognize the contents of a specific broadcast program only by the title displayed on the terminal. The user may also want more detailed information than just a title before selecting a broadcast program.

In order to solve this problem, techniques for including and transmitting preview contents such as down-sized still images or reduced video of each program in EPG data have been studied. However, if the image data is included in the EPG data in this way, the capacity of the EPG data is greatly increased. Therefore, when the EPG data is transmitted through the same medium as the broadcast channel, the transmission efficiency of the broadcast channel is decreased, and when the EPG data is transmitted through a medium different from the broadcast channel, a problem arises that it occupies an unnecessary amount of transmission resources.

Accordingly, the present invention, which was devised to solve the problems of the prior art operated as described above, provides a method and apparatus for displaying a captured image of a broadcast program together with an electronic program guide (EPG) of a digital broadcast system. .

The present invention provides a method and apparatus for receiving a selected program in a digital broadcasting system and simultaneously capturing images of other programs and displaying them as an electronic program guide.

According to a preferred embodiment of the present invention, in the electronic program guide method using a still image of a digital multimedia broadcasting,

Capturing a still image from broadcast data of each broadcast program received;

Storing the captured still image in combination with electronic program guide (EPG) data for each broadcast program;

Displaying the captured still image together with the EPG data;
Capturing the still image,
Receiving a frame indicating a compressed image of a main channel, identifying whether the frames of the main channel are key frames;
If the input frame of the main channel is not a key frame, decoding the non-key frame of the main channel and outputting it as an image signal of the main channel;
If the input frame of the main channel is a key frame, decoding the key frame of the most recently stored sub-channel and outputting it as a video signal of the sub-channel;
Generating a still image of the video signal of the sub-channel;
And after decoding the key frame of the sub-channel, the key frame of the main channel is decoded and output as a video signal of the main channel.

Another embodiment of the present invention, in the electronic program guide device using a still image of the digital multimedia broadcasting,

A still image generation unit for capturing a still image from broadcast data of each broadcast program received;

A memory unit configured to store the captured still image in combination with electronic program guide (EPG) data for each broadcast program;

A display unit for displaying the captured still image together with the EPG data,
The still image generating unit,
A key frame extracting unit which receives frames indicating a compressed image of a sub channel, extracts and stores a key frame among the frames of the sub channel;
A key frame identification unit which receives a frame indicating a compressed image of a main channel and detects whether the frames of the main channel are key frames;
When the key frame of the main channel is not detected, the frames of the main channel is output, when the key frame of the main channel is detected, the key frame of the stored sub-channel is output, and the key frame of the sub-channel is output A channel selector for outputting key frames and subsequent frames of the main channel;
A video decoder configured to decode frames of a main channel or a subchannel output from the channel selector and output image signals;
An image selector for distinguishing the decoded image signals into a main channel or a sub channel and outputting a video signal of the main channel to the display unit;
And a still image detector for generating the still image of the sub-channel image signal distinguished by the image selector.

Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the preferred embodiment of the present invention. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intention or custom of a user or an operator. Therefore, the definition should be made based on the contents throughout the specification.

The main subject of the present invention described below is to display a captured still image of the broadcast program together with the electronic program guide in the digital broadcast system. A terminal having a reception function of digital broadcasting detects one frame among consecutive image frames constituting a moving image of broadcast data and stores it as a still image. The still image is provided to the user with an electronic program guide (EPG) received in association with the broadcast programs.

The terminal initially receives EPG data transmitted from the broadcast center of the digital broadcast in order to allow the user to receive a broadcast channel to be watched or to select another broadcast channel. The broadcast center transmits EPG data containing information on a plurality of broadcast programs that can be provided and broadcast program data. Here, the EPG data is transmitted through the same medium or a different medium as the broadcast channel through which the broadcast program data is transmitted.

1 illustrates a digital broadcasting system for providing broadcast and EPG data according to an embodiment of the present invention. As shown, the broadcast transmitting stations 110, 120, and 130 respectively provide the broadcast and EPG data 140 to the mobile terminal 150 through the same channel or different channels.

A terminal having a digital broadcast reception function may communicate with a cellular mobile communication system using a radio access technology such as CDMA or OFDM, in addition to a digital broadcast reception function. This means a cellular phone having a digital broadcasting function. Such a terminal may receive EPG data separately from broadcast data from a base station of a cellular mobile communication system.

2 illustrates a communication system for transmitting and receiving broadcast and EPG data according to another embodiment of the present invention. As illustrated, the mobile terminal 220 is, for example, a cellular communication terminal having a digital broadcast reception function, and may request EPG data from a mobile communication service provider before receiving digital broadcast. The mobile communication provider 230 transmits the EPG data generated using the information about the broadcast programs provided by the broadcasting center 210 to the mobile terminal 220 through the cellular base station 240. The EPG data includes channel information of broadcast programs, a program title, broadcast time / date and other detailed information. When the user presets broadcast programs requiring EPG, the mobile communication service provider 230 may transmit EPG data for the set broadcast programs to the cellular base station using a multimedia message service (MMS) or wireless Internet. It may be provided to the mobile terminal 220 through the 240.

The portable terminal 220 displays an EPG according to the EPG data on a screen and sets a receiver related to digital broadcast reception to receive a broadcast channel of the selected broadcast program when a user selects a desired broadcast program. Then, the mobile terminal 220 receives the broadcast data transmitted from the broadcasting center 210 and provides the digital broadcasting service to the user. Here, the broadcast data may include EPG data. After starting to receive the digital broadcast, the mobile terminal 220 obtains EPG data directly from the broadcast center 210.

3 shows an example of EPG data according to a preferred embodiment of the present invention.

As shown, the EPG data 310 is composed of broadcast channel information 320 and text data 330. The broadcast channel information 320 includes physical information such as a broadcast channel identifier and a frequency for receiving a broadcast channel. Here, broadcast programs 01, 02, 03 (the numbers represent a broadcast program identifier) of channel 1 (CH1, for example, KBS) and broadcast program 12 of channel 2 (CH2, for example, MBC). And broadcast channel information for broadcast program 25 of channel 3 (CH3, eg, EBS).

The text data 330 includes a broadcast time, a program title, a summary of contents, and the like, as specifically indicated by reference numeral 340. The text data 330 is texts 01, 02, 03, 12, and 25 representing detailed information about corresponding broadcast programs 01, 02, 03, 12, and 25, respectively.

4 is a block diagram of a portable terminal capable of receiving digital broadcasting according to a preferred embodiment of the present invention.

Referring to FIG. 4, the mobile terminal 400 includes a broadcast receiver 420 and a cellular communication unit 430. The cellular communication unit 430 receives a general call-related signal from a cellular base station through an antenna and provides it to the controller 410. The cellular communication unit 430 receives the EPG data for digital broadcasting through a cellular mobile communication network or the wireless Internet and provides the same to the controller 410. In other cases, the broadcast receiver 420 receives the EPG data and provides the same to the controller 410. The memory unit 470 includes a storage area for storing the EPG data, and the EPG data is displayed on the display unit 450 under the control of the controller 410.

The key input unit 440 receives a key input indicating a broadcast program selected for digital broadcast reception from the user according to the EPG data displayed on the display unit 450 and provides the key input to the controller 410. The controller 410 sets the broadcast receiver 420 to receive a broadcast channel of the selected broadcast program according to the key input.

Then, the broadcast receiving unit 420 receives the broadcast data of the selected broadcast program and provides it to the control unit 410. The broadcast data may include image data and sound data and may further include text data and EPG data. The image data and the sound data are provided to the display unit 450 and the sound input / output unit 460, respectively. The EPG data received by the broadcast receiving unit 420 is similarly stored in the memory unit 470 by the control unit 410.

5 illustrates an example of displaying EPG data received by the broadcast receiving unit 420 or the cellular communication unit 430.

Referring to FIG. 5, reference numeral 510 is a status display area that may be selectively displayed to indicate a communication state and a battery state of the portable terminal 400, and reference numeral 520 is a program category, for example, a movie, a drama, It represents a comedy, sports, etc., and reference numeral 530 denotes a broadcast time and title of broadcast programs according to the category. The user operates the key input unit 440 to position the cursor 540 on the desired broadcast program and selects the broadcast program by pressing a predetermined selection key. Then, the broadcast receiving unit 420 receives broadcast data of the selected broadcast program, and the image and sound of the received broadcast data are output through the display unit 450 and the sound input / output unit 460 of the terminal.

In FIG. 4, the controller 410 includes an image and sound processor 480 configured as a video decoder. The video and sound processor 480 restores the compressed video data of the broadcast data received by the broadcast receiver 420 to be displayed on the display unit 450. In particular, according to a preferred embodiment of the present invention, the image and sound processing unit 480 captures a single frame of the image data, and generates a still image. The still image is stored together with the EPG data in the memory unit 470 and displayed on the display unit 450 together with the EPG data of the corresponding broadcast program.

As will be described later, the EPG data and the captured still image may not be automatically displayed. That is, the EPG data and the still image are stored in the memory unit 470 of the terminal and selectively read from the memory unit 470 by a user's operation and displayed on the screen. When the EPG display is not selected, the terminal may display a broadcast program currently received through the broadcast channel selected by the user. If an EPG display is requested by the user while displaying a broadcast program, the terminal reads the EPG data and the still image from the memory and outputs the EPG data. In this case, the EPG data and the still image are displayed in place of the broadcast program on the entire screen or in a small area that is part of the screen on which the broadcast program is displayed.

6 illustrates a configuration of an apparatus for generating a still image of broadcast data according to a preferred embodiment of the present invention, and includes a broadcast channel receiver 610, a video decoder 620, a display unit 630, and a still image detector 640. ) And still image storage 650 and channel selector 670 are shown. The broadcast channel receiver 610 is included in the broadcast receiver 400 of FIG. 4.

Referring to FIG. 6, the broadcast channel receiver 610 receives broadcast data of a broadcast program that a user wants to watch by the channel selector 670 and provides the broadcast data to the video decoder 620. The video decoder 620 restores compressed image data and sound data of the broadcast data. The video decoder 620 supports H.263, Moving Picture Experts Group (MPEG) -4 part-2 or MPEG-4 part-10 / H.264, and a series of image frames constituting compressed image data. The video signals are decoded to generate video signals corresponding to the respective video frames. Although not shown, if the user wants to receive a broadcast program, the generated image signals will be projected on the screen through the display unit 630.

On the other hand, if a still image is to be generated, the still image detector 640 detects an image signal at any point among the decoded image signals from the video decoder 620 and captures the detected image signal. Create as an image. In this case, the still image may be generated as an image reduced in size than the original image signal. This is to save the storage space required for storing the still image and to display still images of as many broadcast channels as possible on the limited size screen of the portable terminal. The generated still image is stored in the still image storage unit 650 to be mapped with EPG data of a corresponding broadcast program under the control of the channel selector 670.

If a new still image is extracted for the broadcast program after the still image has already been stored for a particular broadcast program, the already stored still image is erased and the new still image is stored in place of the previous still image. Therefore, the still image storage unit 716 always stores the most recent still image for each broadcast program. The stored still image is displayed on the display unit 630 together with the EPG data (for example, text) at the user's request or automatically.

The still image is stored in association with the EPG data of the corresponding broadcast program. There may be a variety of ways of combining. As an example, the still image is recorded in a storage area separate from the EPG data, and is associated with the corresponding broadcast program of the EPG data by identifier, or stored in the same storage area as the EPG data as another example. 7A and 7B show an example of storing still images according to a preferred embodiment of the present invention.

Referring to FIG. 7A, the EPG storage unit 710 includes a broadcast channel information storage area 712, a text data storage area 714, and an image storage area 716. The broadcast channel information storage area 712 and the text data storage area 714 are respectively filled with broadcast channel information and text data of EPG data received from a broadcast center or cellular base station, and the image storage area 716 is filled with EPG data. It is composed of empty address areas corresponding to broadcast channel information corresponding to a time point to be stored. According to the example of the EPG data 310 described above, an image storage area 716 having address areas corresponding to broadcast programs 01, 02, 03, 12, and 25 is configured.

According to a user's image search request or automatically, the still images extracted for each broadcasting channel are stored in the image storage area 716 so as to correspond to the corresponding broadcasting channel information. Here, only the images 01, 02, 03, and 12 corresponding to the broadcast programs 01, 02, 03, and 12 are captured and stored in the image storage area 716, and a still image for the broadcast program 25 is not generated.

7B illustrates the case where a still image is stored separately from the EPG. The EPG storage unit 720 includes only a broadcast channel information storage area 712 and a text data storage area 714 for storing broadcast channel information and text data of EPG data. The still image storage unit 730 is composed of a broadcast program identifier region 732 and an image storage region 734. The image storage area 734 stores still images captured from a broadcast program directly received by the portable terminal. The broadcast program identifier area 732 stores broadcast program identifiers for indicating from which broadcast program the stored still images are captured.

Still images captured from broadcast programs according to a preferred embodiment of the present invention are used when displaying a list of broadcast programs that are currently receivable, according to a user's operation or automatically. When the EPG service is requested, previously received and stored EPG data and captured still images are displayed together on the screen of the mobile terminal. 8A and 8B show examples of EPG screens according to an embodiment of the present invention.

Referring to FIG. 8A, reference numeral 810 denotes a program category, and reference numeral 812 denotes detailed information (broadcast time and title) and still images of broadcast programs according to the category in a grid form. The user places the cursor 814 on the desired broadcast program and selects the broadcast program by pressing a predetermined selection key. Then, the received broadcast data of the selected broadcast program is output through the screen of the terminal.

Referring to FIG. 8B, likewise, reference numeral 820 denotes a program category, and reference numeral 822 lists detailed information (broadcast time and title and summary) and still images of broadcast programs according to the category. The user places the cursor 824 on the desired broadcast program and selects the broadcast program by pressing a predetermined selection key. Then, the received broadcast data of the selected broadcast program is output through the screen of the terminal.

9 is a flowchart illustrating an electronic program guide operation according to a preferred embodiment of the present invention.

Referring to FIG. 9, in step 910, the mobile terminal receives and stores EPG data from a broadcasting center or a cellular base station. The EPG data includes a list of broadcast programs that the portable terminal can receive at the current location. In step 912, it is checked whether there is an image search request. The portable terminal receives the image retrieval request automatically at the time of reception of the EPG data or by a user's operation. In step 912, if there is an image search request, the flow proceeds to step 914; otherwise, the flow proceeds to step 924.

In step 924, the portable terminal determines whether the EPG display request has been received by the user or whether the EPG is to be displayed automatically. If the EPG is not displayed, the operation ends. On the other hand, when displaying the EPG, in step 926, the mobile terminal displays text information of each broadcast program included in the EPG data. The display example of step 926 may be the aforementioned FIG. 5.

In step 914, the portable terminal sets a broadcast channel of a broadcast program to be searched among broadcast programs included in the EPG data. The broadcast channel may be set in order of a broadcast program identifier included in the EPG data. In operation 916, the portable terminal captures a still image of the broadcast program of the set broadcast channel and stores the captured image so as to correspond to the broadcast program. In step 918, the portable terminal determines whether to search for the image of the next broadcast channel. If still images for all broadcast programs have been stored or image retrieval has been stopped by the user, the flow proceeds to step 920. Otherwise return to step 914 to search for the next broadcast channel.

In step 920, the portable terminal checks whether the display of the EPG is requested by the user or whether a still image of all the broadcast programs is obtained to automatically display the EPG. When it is confirmed that the EPG is to be displayed, in step 922, the portable terminal displays text information of each broadcast program included in the EPG data together with the captured still image. The display example of step 922 may be the above-described FIG. 8A or 8B. If the EPG is not displayed, the operation ends.

If the EPG is displayed in step 922 or step 926, the user may select and receive the broadcast program after placing the cursor on a desired broadcast program.

Meanwhile, in a further improved embodiment of the present invention, while receiving the selected main broadcast program and displaying the full screen of the portable terminal, the still image of another broadcast program is simultaneously searched or displayed while being displayed in a smaller screen area. The small area may overlap a portion of the entire screen. That is, in a communication system capable of receiving two or more broadcast channels at the same time, such as CDMA or OFDM, the portable terminal receives one broadcast program and simultaneously captures still images of another broadcast program. 8C shows an example of an EPG screen according to this embodiment.

Referring to FIG. 8C, reference numeral 830 denotes a screen of a broadcast program currently being received by the mobile terminal, and reference numeral 832 denotes text information of a next broadcast program in order of a broadcast program identifier according to EPG data. Reference numeral 834 denotes a screen on which a still image captured for the next broadcast program is displayed. As described above, the still image represented by the picture in picture (PIP) method may be captured simultaneously with the reception of the current broadcast program by a video decoder or the same decoder separate from the current broadcast program being received.

However, using a separate video decoder to detect still images can maximize the performance of video image decoding, but is not suitable for portable digital multimedia broadcasting receivers due to the high system complexity. Therefore, a multi-channel video decoder that efficiently decodes a video image input from two or more broadcast channels simultaneously with one video decoder is used.

In more detail, the current broadcast channel that the user wants to watch becomes the main channel, and the other broadcast channel that wants to capture still images or the next broadcast channel that the user wants to search becomes the subchannel. One video decoder, which can be connected to both the main channel and the sub channel, decodes the main frame of the sub channel at a possible time point while decoding the video frames of the main channel. Here, a possible time point means a time point at which a key frame occurs in the main channel.

FIG. 10 is a block diagram of a multi-channel video receiver for generating still images of sub-channels using one video decoder according to a preferred embodiment of the present invention. Two channel receivers 1002, 1012 for the primary channel, a key frame identifier 1003 for the primary channel 1000, a key frame extractor 1014 for the secondary channel 1010, and a channel selector 1004 And a video decoder 1006, an image selector 1008, a display portion 1016 and a still image detector portion 1018 are shown. The channel receivers 1002 and 1012 are included in the broadcast receiver 420 of FIG. 4.

Referring to FIG. 10, a broadcast channel that a user wants to watch is mapped to a primary channel 1000, and another broadcast channel that is intended to capture still images is mapped to a subchannel 1010. Such channel mapping may be performed by a channel selector (not shown). The received signal including the image data of the main channel 1000 is output through the demultiplexing / demodulation by the channel receiver A 1002. Similarly, the received signal including the image data of the sub channel 1010 is output through the demultiplexing / demodulation by the channel receiver B 1012.

The channel receiver A 1002 outputs successive frames containing compressed image information of the main channel 1000. The key frame identification unit 1003 analyzes the frames of the main channel to identify the key frame, and provides a control signal to the channel selector 1004 and the image selector 1008 when the key frame of the main channel is detected.

Meanwhile, the channel receiver B 1012 outputs successive frames containing compressed image information of the sub channel 1010. The key frame extractor 1014 attempts to detect the key frame by analyzing the frames of the sub channel, and when the key frame of the sub channel is detected, stores the key frame of the sub channel in an internal buffer (not shown). . If the next key frame of the sub channel is detected without the stored sub channel key frame being output, the key frame extractor 1014 clears the buffer to remove the previously stored sub channel key frame, and Save the next key frame again. As such, the key frame extractor 1014 always stores the most recent sub-channel key frame. At this time, the difference frames of the subchannel are ignored.

When the channel selector 1004 does not generate a control signal indicating that a key frame of the main channel is generated by the key frame identification unit 1003, the channel selector 1004 receives the primary input through the key frame identification unit 1003. Simply bypass the frames of the channel to the video decoder 1006. When the control signal is generated, the channel selector 1004 reads the key frame of the sub-channel buffered by the key frame extractor 1014 and delivers the video decoder 1006. After the key frame of the sub channel is delivered, the channel selector 1004 again starts with the key frame of the main channel and delivers the frames of the main channel to the video decoder 1006.

That is, when the control signal is generated, decoding of the main channel key frame is temporarily stopped and the key frame of the sub channel is input to the video decoder 1006 by the channel selector 1004. In other words, the key frame of the sub-channel is input before the key frame of the main channel is input to the video decoder 1006. At this time, the key frame of the main channel and the non-key frames to be input later may be temporarily stored together in the buffer of the channel receiver A 1002. In other cases, if video decoder 1006 has the ability to operate fast enough, video decoder 1006 decodes the key frame of the sub-channel while decoding of the main channel is paused, and subsequent frames of the main channel. Decode the key frames of the primary channel before they are received.

The video decoder 1006 decodes image frames input through the channel selector 1004 and outputs image signals corresponding to each frame. When the input frame is a difference frame instead of a key frame, the video decoder 1006 combines the input difference frame with a previously processed frame to restore an image signal of a corresponding channel. On the other hand, if the input frame is a key frame, the video decoder 1006 resets the existing image processing and restores the image signal of the corresponding channel using only the key frame. Here, the procedure of reconstructing the video signal by the video decoder 1006 follows the video compression technique used, and thus the detailed description thereof will be omitted since it is not related to the main subject of the present invention.

The image signals output from the video decoder 1006 are input to the image selector 1008. The image selector 1008 waits for one frame processing time of the video decoder 1006 when a control signal indicating that a key frame of the main channel is generated by the key frame identification unit 1003 does not occur. Thereafter, the video signals output from the video decoder 1006 are output as a main channel image on a relatively large screen (ie, a full screen) of the display unit 1016.

When the control signal is generated, the image selector 1008 waits for one frame processing time of the video decoder 1006 and then uses the video signal output from the video decoder 1006 as a sub-channel image. It outputs to the detection part 1018. The still image detector 1018 generates a captured still image of the subchannel from the subchannel image. At this time, the still image is an image reduced to a predetermined size than the original image signal.

The captured still image of the sub channel is output on a relatively small screen of the display unit 1016. In this case, text information regarding the sub channel of the EPG data may be displayed together with the small screen. That is, the text information of the sub channel read out from the EPG data is displayed together with the still image. An example of displaying the main channel and the sub channel may be illustrated in FIG. 8C. In addition, the captured still image of the sub-channel may be stored together with the EPG data of the sub-channel in the still image storage unit (not shown) so that it can be displayed when a user requests.

11 is a flowchart illustrating an operation of outputting a guide of a next broadcast program during reception of a broadcast program according to an exemplary embodiment of the present invention.

Referring to FIG. 11, after a broadcast program that a user wants to watch is selected by a user's operation in step 1110, the mobile terminal sets a broadcast channel of the selected broadcast program as a main channel in step 1112 to broadcast the main channel. Receive. In step 1114, the mobile terminal checks channel information on a next broadcast program of the selected broadcast program according to a broadcast program list of EPG data, and sets the checked next broadcast program as a subchannel in step 1116 to broadcast the subchannel. Receive As described above in step 1118, a still image for the subchannel is captured. The captured still image is mapped and stored with the corresponding EPG data so that it can be used upon EPG display request.

In operation 1120, the portable terminal determines whether a search for a next broadcast channel corresponding to the next broadcast program is requested by the user. If there is no search request for the next broadcast channel, the process returns to step 1110 to continuously receive the main channel or to set and receive another broadcast channel selected by the user as the main channel. On the other hand, if there is a search request for the next broadcast channel, in step 1122, text information of the next broadcast channel and the captured still image according to EPG data are output as part of a screen on which the video of the main channel is output.

When the user checks the text information and the still image of the next broadcast channel and selects the next broadcast channel using a cursor, the selected broadcast channel is switched to the main channel and started to be output through the entire area of the screen. The mobile terminal performs the procedure according to FIG. 11 while receiving the new main channel to receive a corresponding next broadcast channel to detect and store a still image of the next broadcast channel.

The multi-channel video receiver of FIG. 10 mentioned above may be used not only to detect still images of the next broadcast channel while receiving one broadcast channel, but also to detect still images of other broadcast channels. That is, the multi-channel video receiver sets the broadcast channel that the user wants to watch as the main channel, receives and displays the video of the main channel, and simultaneously captures and stores still images of other broadcast channels as subchannels. . The stored still images are used in the case of displaying a broadcast program list as shown in Fig. 8A or 8B according to the user's operation or automatically.

12 is a flowchart illustrating an operation of capturing a still image during reception of a broadcast program according to an exemplary embodiment of the present invention.

Referring to FIG. 12, in step 1210, a broadcast program that a user wants to watch is selected by a user's operation, and in step 1212, the portable terminal sets a broadcast channel of the selected broadcast program as a main channel to broadcast the main channel. Receive. In operation 1214, the mobile terminal checks channel information about another broadcast program to be searched, sets the broadcast program to be searched as a subchannel, and receives the broadcast of the subchannel. The broadcast program to be searched for first may be the next broadcast program of the main channel according to the broadcast program list of EPG data. As described above in step 1216, a still image for the subchannel is captured. The captured still image is stored for use in an EPG presentation request.

In step 1218, the portable terminal determines whether to search for the image of the next broadcast channel. If still images for all broadcast programs have been stored or image retrieval has been stopped by the user, go to step 1220. Otherwise return to step 1214 to search for the next broadcast channel.

In step 1220, the portable terminal determines whether display of the EPG is requested by the user. If it is confirmed that the EPG is to be displayed, in step 1222 the mobile terminal displays the text information of each broadcast program and the corresponding captured still image together in the EPG data, or the next broadcast of the currently received (ie, main channel) broadcast program. Display only textual information and still images about the program. If the EPG is not displayed, the process returns to step 1210 to continuously receive the currently receiving broadcast program or to receive another broadcast channel selected by the user.

When displaying the still images captured with the EPG in step 1222, the user can place the cursor on the desired broadcast program and then select and receive the broadcast program.

In another embodiment, the multi-channel video receiver alternately sets the broadcast channels to be searched to the main channel and the sub channel, and quickly captures still images of the broadcast channels at twice the speed. In this case, still images are detected simultaneously in both the main channel and the sub channel. The still images detected in this way are stored in the memory, and are shown in a list together with the EPG data.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

In the present invention operating as described in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

Since the present invention does not include the pre-generated image data in the EPG data and transmits it, the transmission resource of the EPG data is saved, and the captured image screen currently being transmitted in the broadcast channel is used instead of the fixed image generated in advance. It is effective to provide a guide to help the user select a channel more directly.

Claims (24)

In the electronic program guide method using a still image of digital multimedia broadcasting, Capturing a still image from broadcast data of each broadcast program received; Storing the captured still image in combination with electronic program guide (EPG) data for each broadcast program; Displaying the captured still image together with the EPG data; Capturing the still image, Receiving a frame indicating a compressed image of a main channel, identifying whether the frames of the main channel are key frames; If the input frame of the main channel is not a key frame, decoding the non-key frame of the main channel and outputting it as an image signal of the main channel; If the input frame of the main channel is a key frame, decoding the key frame of the most recently stored sub-channel and outputting it as a video signal of the sub-channel; Generating a still image of the video signal of the sub-channel; And after decoding the key frame of the sub-channel, decoding the key frame of the main channel and outputting the key frame of the main channel as an image signal of the main channel. delete The method of claim 1, wherein the decoded video signals, And classifying the main channel or the sub channel according to whether a key frame of the main channel is detected. The method of claim 1, wherein capturing the still image comprises: And receiving a broadcast program that a user wants to watch as a main channel, and sequentially setting other broadcast programs as subchannels to capture still images of the other broadcast programs. The method of claim 1, wherein capturing the still image comprises: Characterized in that a user captures a still image of the next broadcast program by setting and displaying broadcast data of a broadcast program that the user wants to watch as a main channel, and setting a next broadcast program of the received broadcast program as a subchannel. How to guide the program. The electronic program guide method of claim 5, wherein the still image for the next broadcast program is displayed overlapping a part of a screen area on which the broadcast data of the main channel is displayed. The method of claim 1, wherein the storing is performed. And storing the still image in the same storage area or different storage areas as the EPG data. The method of claim 1, wherein the still image, The electronic program guide method, characterized in that it is produced in a reduced size than the original size of the broadcast data. The method of claim 1, wherein the EPG data, Electronic program guide method comprising a broadcast time and title of the broadcast program. The method of claim 1, wherein the EPG data, Electronic program guide method comprising a summary of the broadcast time and title and content of the broadcast program. The method of claim 1, wherein the displaying is performed. And displaying the still image and the EPG data together in a smaller screen area while displaying a broadcast program that the user wants to watch on the screen of the terminal receiving the digital multimedia broadcasting. The method of claim 1, wherein the displaying is performed. And displaying the still image and the EPG data in a list form when a user requests EPG display. An electronic program guide device using still images of digital multimedia broadcasting, A still image generation unit for capturing a still image from broadcast data of each broadcast program received; A memory unit configured to store the captured still image in combination with electronic program guide (EPG) data for each broadcast program; A display unit for displaying the captured still image together with the EPG data, The still image generating unit, A key frame extracting unit which receives frames indicating a compressed image of a sub channel, extracts and stores a key frame among the frames of the sub channel; A key frame identification unit which receives a frame indicating a compressed image of a main channel and detects whether the frames of the main channel are key frames; When the key frame of the main channel is not detected, outputs the frame of the main channel, when the key frame of the main channel is detected, outputs the key frame of the stored sub-channel, the key frame of the sub-channel is output A channel selector for outputting key frames and subsequent frames of the main channel; A video decoder configured to decode frames of a main channel or a subchannel output from the channel selector and output image signals; An image selector for distinguishing the decoded image signals into a main channel or a sub channel and outputting a video signal of the main channel to the display unit; And a still image detector for generating a still image of a sub-channel image signal distinguished by the image selector. delete The method of claim 13, wherein the decoded video signals, And classifying the main channel or the sub channel according to whether a key frame of the main channel is detected. The method of claim 13, wherein the still image generating unit, And receiving a broadcast program that a user wants to watch as a main channel, and sequentially setting other broadcast programs as subchannels to capture still images of the other broadcast programs. The method of claim 13, wherein the still image generating unit, Characterized in that a user captures a still image of the next broadcast program by setting and displaying broadcast data of a broadcast program that the user wants to watch as a main channel, and setting a next broadcast program of the received broadcast program as a subchannel. Program guide device. The method of claim 17, wherein the display unit, And displaying a still image of the next broadcast program by overlapping a portion of a screen area on which the broadcast data of the main channel is displayed. The method of claim 13, wherein the memory unit, And store the still image in the same storage area or different storage areas as the EPG data. The method of claim 13, wherein the still image, The electronic program guide device, characterized in that the generated size is reduced to the original size of the broadcast data. The method of claim 13, wherein the EPG data, And a broadcast time and title of the broadcast program. The method of claim 13, wherein the EPG data, And a summary of a broadcast time, a title, and a content of the broadcast program. The method of claim 13, wherein the display unit, And displaying the still image and the EPG data together in a smaller screen area while displaying a broadcast program that the user wants to watch on the screen of the terminal receiving the digital multimedia broadcasting. The method of claim 13, wherein the display unit, And displaying the still image and the EPG data in a list form when a user requests an EPG display.

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