KR20050115604A - Educational broadcasting overseeing system and method - Google Patents

Abstract

The present invention relates to an educational broadcast watching monitoring system and method for monitoring a broadcast signal received by a channel selected by a user in an AV system. That is, in the present invention, in the TV viewing monitoring in the AV system, when the education broadcasting viewing monitoring mode is set by the user, it is determined whether a sudden change in the amount of data between frames of the input video signal decoded from the MPEG2 decoder occurs. When a sudden change in the amount of data between frames of an input video signal occurs, the program recognizes a change in a broadcast program and captures an I-frame of the video signal input at a corresponding point in time and stores it as a still picture. It is possible to check the information of the watched broadcast program.

Description

Educational Broadcasting Monitoring System and Method {EDUCATIONAL BROADCASTING OVERSEEING SYSTEM AND METHOD}

The present invention relates to an audio / video (AV) system, and more particularly, to an education broadcasting watching monitoring system and method for monitoring a broadcast signal received by a channel selected by a user in an AV system.

In general, there are methods for monitoring TV viewing in real time, and a method of recording and storing the watched broadcast program. In this case, the real-time monitoring method is difficult because, for example, a parent who is a monitor wants to monitor whether the children watch the educational broadcast or not, only by watching a TV broadcast program with the monitor children. On the other hand, the method of recording the broadcast program watched and monitoring it later through the recorded broadcast program is convenient in that the watcher does not have to watch TV with the person who wants to watch TV. .

However, in the above-described monitoring method after storing the broadcast program data, when the video and sound data of all the broadcast programs watched by the monitored user are stored as they are, there is a limit of the data magnetic capacity due to the huge capacity of the broadcast program data. In the case of MPEG-2 coded data, data decoding takes a long time when decoding using a general-purpose processor, and additional hardware is required when a dedicated processor is used.

Accordingly, an object of the present invention is to provide an education broadcast watching monitoring system and method for monitoring a broadcast signal received by a channel selected by a user in an AV system.

In accordance with another aspect of the present invention, there is provided a system for monitoring educational broadcasting, comprising: a tuner unit configured to demodulate and then tune a broadcast program bit stream of a channel corresponding to a tuning control signal among bit streams received through an antenna or a cable; The MPEG-2 decoder which decodes and broadcasts the broadcast signal provided from the tuner into an audio signal and a video signal, and the sudden change in the amount of data more than a predetermined reference value between frames by inspecting the decoded video signal from the MPEG2 decoder. A control unit for capturing an I frame of a video signal input at a corresponding point in time and storing it as a still picture, and a memory unit for sequentially storing a still picture corresponding to an input image I frame converted into a still picture by the control unit; do.

In another aspect, the present invention provides a method for monitoring educational broadcast viewing, comprising the steps of: (a) MPEG-2 decoding processing of a broadcast program bit stream input from a selected channel when there is a broadcast viewing monitoring mode request key input from a user, and (b) MPEG2. Comparing the inter-frame data amount of the decoded video signal to check whether the inter-frame data change amount exceeds the reference value, and (c) inputting when the inter-frame data change amount of the input video signal exceeds a preset reference value. Detecting the I frame of the video signal and converting it into a JPEG still image; and (d) storing the I frame data of the JPEG still image converted input video signal sequentially in a memory unit to display image information of a channel viewed by the user. Recording.

Hereinafter, with reference to the accompanying drawings will be described in detail the operation of the preferred embodiment according to the present invention.

1 is a schematic block diagram of a digital TV receiver, which is one of AV systems equipped with an educational broadcasting watching and monitoring function according to an exemplary embodiment of the present invention. Hereinafter, referring to FIG. 1, the operation of monitoring educational broadcasting viewing in a digital TV receiver will be described.

First, the key input unit 104 is composed of a key matrix on a remote controller or its own panel to generate a key data signal according to a user's key operation and apply the generated key data signal to the control unit (MCU) 106. The memory unit 108 stores operation programs for operating the digital TV receiver, and stores and outputs various program information output from the tuner unit 100 under the control of the controller 106.

The control unit 106 controls the overall operation of each unit of the digital TV receiver according to the operation program stored in the memory unit 108 and generates a control signal for performing a corresponding function according to the key data signal from the key input unit 104. To the functional unit. For example, the tuner 100 provides a tuning control signal for tuning a broadcast channel selected by a user, and generates a decoding control signal for decoding the tuned broadcast signal.

In addition, when there is a key input for the education broadcast viewing monitoring mode from the key input unit 104 according to an embodiment of the present invention, the control unit 106 examines the decoded video signal from the MPEG-2 decoder 102 to make a frame. If there is a sudden change in the amount of data between them, the I (intra-picture) frame of the video signal input at that time is captured and stored as a JPEG still image. 108 displays a still image of the stored broadcast program so that the user can check the information of the previously watched broadcast program.

In other words, the MPEG2 data is composed of an intra-picture frame for spatial encoding, a bidirectionally predictive-picture frame through prediction of temporal encoding motion, and a predictive-predictive-picture frame. The point to note here is that if the motion is small in B and P frames, the amount of data is reduced. On the other hand, educational broadcasts with a large number of static screens have a large amount of B and P frames compared to entertainment programs, so the amount of data is inevitably small. Therefore, instead of decoding MPEG-2 coded data to check the data in watching educational broadcasts, statistics of the entire B and P frames of the educational broadcasts are calculated. Recognizing that the viewer is watching, the I frame is saved as a JPEG still image so that the program can be monitored.

The tuner unit 100 tunes a bit stream of a channel corresponding to a tuning control signal of a controller among the bit streams received from the satellite through the antenna, and then demodulates it again to remove a moving picture experts group (MPEG) decoder. The MPEG decoder 102 separates and decodes the broadcast signal provided from the tuner 100 into an audio signal and a video signal, and displays the same on a screen through a predetermined signal processing process.

FIG. 2 is a flowchart illustrating a process of monitoring an educational broadcast watching method using I frames of MPEG-2 video signals in an educational broadcasting watching and monitoring system according to an exemplary embodiment of the present invention. Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

First, when a user inputs an education broadcasting watching monitoring mode to a AV system such as a digital TV by a user, the control unit 106 sets the education broadcasting watching monitoring mode in response to the step (S200), and proceeds to step S202. The AV broadcast program data received through the tuner unit 100 is input.

Subsequently, the control unit 106 performs MPEG-2 decoding on the bit stream of the broadcast program input from the channel selected by the viewer to be monitored in the state in which the monitoring mode is set by the user using the MPEG2 decoder 102 in step S204. The video signal is separated into an audio signal and a video signal, and in step S206, the amount of data change between frames exceeds the reference value by comparing the amount of data between frames of the MPEG-2 decoded input broadcast program video signal. In this case, the inter-frame data variation checking may be performed by comparing the inter-frame data amount of the video signal periodically at predetermined time units according to a user's selection.

On the other hand, if the inter-frame data change amount of the input video signal does not exceed a preset reference value, the control unit 106 proceeds from step S208 to step S210 to determine the video signal of the MPEG-2 decoded broadcast program. It is displayed on the screen through the signal processing process of.

On the contrary, when the interframe data amount comparison result of the input video signal is detected in step S206 as a result of the interframe data variation of the input video signal exceeding a preset reference value, the control unit 106 determines in step S208 that In step S212, the I frame of the input broadcast program video signal is detected and converted into a JPEG still picture.

Subsequently, the controller 106 sequentially stores the I frame data of the JPEG still image-converted input video signal in the memory unit 108 in step S214 to record image information of a channel watched by the user, and then the user. By displaying the still image of the stored broadcast program from the memory unit 108 when the reproduction of the monitoring still image for monitoring, the user can check the information of the broadcast program previously watched by the viewer to be monitored.

As described above, in the present invention, in the TV system monitoring in the AV system, it is determined whether a sudden change in data amount between frames of the input video signal decoded from the MPEG-2 decoder occurs when the education broadcasting viewing monitoring mode is set by the user. If a sudden change in the amount of data between frames of the input video signal occurs, the program recognizes the change in the broadcast program, captures the I frame of the video signal input at the corresponding time point, and stores it as a still picture. It is thereby possible to check the information of the previously watched broadcast program.

Meanwhile, in the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the invention should be determined by the claims rather than by the described embodiments.

As described above, in the present invention, in the TV viewing monitoring in the AV system, if the education broadcasting viewing monitoring mode is set by the user, whether there is a sudden change in the amount of data between frames of the input video signal decoded from the MPEG2 decoder. If a sudden change in the amount of data between frames of the input video signal occurs and recognizes a change in the broadcast program, the I frame of the video signal input at the corresponding time point is captured and stored as a still picture. Since the viewer can check the information of the previously watched broadcast program, there is an advantage of performing an efficient educational broadcast watching and monitoring.

1 is a schematic block diagram of an AV system having an educational broadcasting watching and monitoring function according to an embodiment of the present invention;

2 is an operation control flowchart for implementing education broadcasting watching monitoring in an AV system according to an embodiment of the present invention;

<Brief description of the major symbols in the drawings>

100: tuner unit 102: MPEG-2 decoder

104: key input unit 106: control unit

108: memory section

Claims (3)

As an educational broadcasting viewing monitoring system, A tuner unit configured to tune and then demodulate a broadcast program bit stream of a channel corresponding to a tuning control signal among bit streams received through an antenna or a cable; An MPEG-2 decoder for decoding and outputting the broadcast signal provided from the tuner into an audio signal and a video signal; A controller for inspecting a video signal decoded by the MPEG-2 decoder and capturing an I frame of a video signal input at a corresponding time point and storing the frame as a still picture when a sudden change in the amount of data exceeds a predetermined reference value between frames; A memory unit for sequentially storing a still image corresponding to an input image I frame converted into a still image by the controller; Education broadcast watching surveillance system comprising a. As a monitoring method for watching educational broadcasting, (a) MPEG-2 decoding processing of a broadcast program bit stream input from a selected channel when there is a broadcast watching monitoring mode request key input from a user; (b) comparing the amount of interframe data of the MPEG 2 decoded video signal to determine whether the amount of change in interframe data exceeds a reference value; (c) detecting an I frame of an input video signal and converting the frame to a JPEG still picture when the amount of change in interframe data of the input video signal exceeds a preset reference value; (d) sequentially storing the I frame data of the JPEG still image converted input video signal in a memory unit to record image information of a channel watched by a user; Education broadcast watching monitoring method comprising a. The method of claim 2, In the step (b), the inter-frame data change amount inspection is performed by comparing the inter-frame data amount of the video signal periodically at a predetermined time unit by the user.