KR19990065562A - Digital Broadcast Content Grab Method - Google Patents

Abstract

A method of grab broadcasting content of a digital receiver having a remote control, the method comprising: selecting a screen stop key of the remote controller, stopping the encoded MPEG image data when the screen stop key is input; Digital broadcasting contents which can only be watched by detecting the I frame among the still image data and storing them in an external memory, transmitting the stored image data to a peripheral device, and outputting the transmitted image data. If necessary, it can be documented or documented without writing by hand while saving or outputting the desired data with simple key operation.

Description

Digital Broadcasting Content Grab Method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital broadcasting system, and more particularly, to a digital broadcasting contents grab method that enables a user to instantly capture a desired screen and store it or output it using a peripheral device.

In general, in a digital imaging system, each frame of an image is sampled in units of pixels. Since image information is very large, a technique of compressing (or encoding) an image is required for efficient transmission or storage.

Hereinafter, with reference to the accompanying drawings as follows.

1 is a block diagram showing a digital receiver according to the prior art, Figure 2 is a block diagram showing the configuration of a general MPEG (MPEG) decoder.

Referring to FIG. 1, a remote controller 1 for receiving a user's remote control signal, a microcomputer 2 for outputting various control signals corresponding to the signal received from the remote controller 1, and a control of the microcomputer 2. A channel decoding processor (3) for receiving a broadcast signal from a satellite, cable network or terrestrial wave according to a signal, performing demodulation and preprocessing error correction (FEC), and outputting it in the form of a digital bitstream; A transport demux 4 for selectively outputting a corresponding signal by a control signal for a channel, an MPEG decoder 5 for receiving and decoding a signal selected and output from the transport demux 4; A frame memory 6 storing a picture of data decoded by the MPEG decoder 5 in a picture decoding region and an output signal of the MPEG decoder 5 are output as a video signal. Consists of a video encoder 7, a display section 8 for displaying an output of the video encoder (7).

In the operation according to the prior art configured as described above, broadcast signals from a surface bottom, a satellite or cable network, and terrestrial waves are output in the form of a digital bitstream from the channel decoding processing unit 3 by the control signal of the microcomputer 2, and then transported again. The demux 4 outputs only the signal selected by the user.

The MEPG image data selected by the transport demux 4 is received, decoded by the control of the microcomputer 2, and stored in the frame memory 6, and decoded by the MPEG decoder 5. The encoded data is encoded and then output to the display unit 8.

The configuration of a general MPEG decoder is an international standard for moving picture compression and reconstruction, as shown in FIG. 2. And a frame memory 6 which decodes and stores the data compressed by the MPEG decoder 5.

In this case, the frame memory 6 performs only a bitstream decoding region 6a, an I picture decoding region 6b that encodes only intra components according to a motion compensation format, and forward prediction. The pictures are allocated to the P picture decoding area 6c.

FIG. 3 is a diagram showing a prediction structure between pictures I, P, and B. In MPEG, an I sequence of a moving picture is divided into a plurality of frames, that is, a GOP (Group Of Picture) consisting of pictures, and encoding is performed. Do it.

As shown in FIG. 3, the image types to be encoded are three types of I (intra code), P (forward prediction code), and B (bidirectional prediction code), and the relationship between them is shown in FIG. .

In other words, in MPEG, interframe prediction numbers and characteristic B pictures are introduced to ensure sufficient compression ratio, and I pictures are inserted at intra-frame coding at appropriate intervals to overcome image quality degradation due to accumulation of errors.

The GOP is composed of an I picture which is an intra-frame coded picture, a P picture that is a coded picture between frames that are already coded and temporally processed in the previous frame, and a B picture that is a bidirectional predictive interpolation image that is predicted in two frames before and after.

Here, the I picture is coded using only the information of the frame itself, so that the compression rate cannot be very high. However, the I picture can be started from random access from within the bit stream.

The P picture is frame coded in the immediately preceding frame or with reference to the immediately preceding P frame. Since the P picture is coded using synchronous compensation, a compression ratio greater than the I picture can be obtained, but a coding error may be transmitted because there are times when the previous P frame is predicted. Can be.

On the other hand, since the B picture is used as a frame with reference to past and future frames, the compression rate can be increased.

If another picture or the P picture is not used as a reference frame, the above error may not be transmitted.

The digital broadcasting receiver according to the prior art is inconvenient because there is no device or method that can output to the peripheral device when the user wants to immediately output the necessary information during viewing.

The present invention has been made to solve the above problems, and provides a digital broadcasting content grab method that allows a user to instantly capture and store a desired screen while watching a broadcast or output using a peripheral device. have.

1 is a block diagram illustrating a digital receiver according to the prior art.

2 is a block diagram illustrating a general MPEG decoder.

3 is a view showing each general image type

FIG. 4 is a diagram showing the interrelationship of each image type shown in FIG.

5 is a block diagram illustrating a digital receiver in accordance with the present invention.

6 is a flowchart illustrating a digital broadcasting grab method according to the present invention.

Explanation of symbols for main parts of the drawings

21: remote control 22: microcomputer

23: channel decoding processing unit 24: transport demux

25: MPEG decoder 26: Frame memory

27: video encoder 28: display unit

29: data transmission unit 30: peripheral device

The present invention relates to a digital broadcasting content grab method, comprising the steps of: selecting a screen storage key of the remote controller in a digital broadcasting receiver having a remote control; And storing the I frame among the screen information stored in the frame memory, and outputting the read data to the peripheral device.

Hereinafter, a digital receiver and a control method thereof according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 5 is a block diagram illustrating a digital receiver according to the present invention, and FIG. 6 is a flowchart illustrating a digital broadcasting grab method according to the present invention.

The concept according to the present invention is an apparatus and method for capturing necessary information among image information supported by a satellite broadcasting system and outputting it to a peripheral device.

As shown in FIG. 4, the remote controller 21, the microcomputer 22, the channel decoding processing unit 23, the transport demux 24, the MPEG decoder 25, and the frame memory ( 26, the image encoder 27, and the display unit 28 are made in the same manner as in the related art, and a data transmission unit for transmitting data from the microcomputer 22 when a screen stop key is input from the remote controller 21 ( 29 and a peripheral device 30 for outputting the data transmitted from the data transmission unit 29.

The MPEG decoder 25 decodes MPEG data, stores I, P, and B pictures in a corresponding picture area of the frame memory 26, and simultaneously displays the image through the image encoder 27. Display the image on.

The image encoder 27 converts the output of the MPEG decoder 25 into a form required for digital / analog (D / A) conversion and PAL or NTSC display, and then displays the display unit 28. Will output

On the other hand, if you want to output the desired screen of the image output from the display unit 28, input the screen jersey key of the remote control 21, the received microcomputer 22 is decoded by the MPEG decoder (25) In the frame memory 26 storing the stored data, only I frames may be output and transmitted to the peripheral device 30 to be output using a monitor or a printer.

A broadcast content grab method of the digital receiver configured as described above will be described with reference to FIG. 5.

In the grab method of broadcasting contents of a digital receiver having a remote controller, selecting a screen stop key of the remote controller (S1), and when the screen stop key is input, a screen on which encoded MPEG image data is displayed is displayed. It stops (S2).

I frame is detected among the still image data (S3). The detected I frame is stored in a frame memory (S4).

The stored image data is transmitted to the peripheral device (S5), and the transmitted image data is output to the peripheral device (S6).

As such, when the user makes a screen stop command at any moment, the MPEG screen is controlled to stop.

Then, after reading the I frame into the frame memory in the still picture, the transfer command is started to the peripheral device.

The reason for confirming the I frame is that the I frame is the most perfect screen configuration among the data transmitted to the GOP, so that the user can not see awkward because the correct screen can be seen without detecting the whole.

The corresponding port of the peripheral device designated by the user is enabled, and the image stored in the microcomputer memory is transmitted to the designated peripheral device.

The digital broadcasting content grab method according to the present invention has the following effects.

First, if the digital broadcast contents that were only available for viewing are needed, the desired data can be stored or output by simple key manipulation.

Second, it is possible to document or document only the desired screens of digital broadcasting contents without handwriting.

Claims (2)

Selecting a screen stop key of the remote control; Stopping encoded MPEG image data displayed when the screen stop key is input; Detecting an I frame among the still image data and storing the frame in a frame memory; Transmitting the stored image data to a peripheral device; And a step of outputting the transmitted image data. The method of claim 1, And outputting the transmitted image data comprises outputting via a computer or a printer.