KR20000034375A - Apparatus for printing still picture of digital television - Google Patents

Abstract

PURPOSE: An apparatus for printing still pictures of digital television is provided to display several still pictures before and after the time of request, and to print the still pictures of user's selection. CONSTITUTION: An apparatus for printing still pictures of digital television includes a user block(100), a tuner and decoder, a frame memory(700), an MPEG(Motion Pictures Experts Group) decoder(500), a picture signal processor(600), a switch(300), a display(650), a printer(900), a printer interface, and a system controller(200). The user block(100) generates a user control signal. The tuner and decoder subtracts a compressed encoded video data from the channel selected. The frame memory(700) stores plurality of data on an infra frame, and outputs the infra frame on a frame basis. The MPEG decoder stores the video data from the tuner and decoder of the video data stored in the frame memory into a video data. The picture signal processor converts the video data. The switch outputs the video data to the MPEG decoder or to a frame memory. The printer prints the decoded picture signal.

Description

Digital TV, Still Image Printing Device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a still image printing apparatus of a digital television, and more particularly, to a still image printing of a digital television capable of selecting and printing a still image desired by a user while performing a normal viewing mode on a digital television. Relates to a device.

In general, a digital television system compresses and transmits digital video and audio data by using a predetermined compression algorithm, for example, a hybrid encoding algorithm, and restores the video and audio data, which are compressed and transmitted, to the original data to serve a viewer. Thus, the information provided in such a digital television system can be roughly divided into program information, data information, and control information.

In a digital TV system, program information, data information, and control information are formed into a predetermined packet stream, for example, a packet stream in units of 188 bytes, and then carried on a carrier wave.

Program information, for example, represents TV programs provided by each broadcaster for the purpose of being broadcast to subscribers, and includes video information, user information such as caption data, and audio information.

The data information includes information defined according to the service provider, for example, electronic newspaper service information, magazine service information, karaoke service information, and the like.

Control information is a program such as program ID, channel ID, program name, caption service presence, program class, current time information, etc. necessary for demultiplexing and reconfiguring program information or data information of a selected channel from a packet stream carried on a carrier channel. It contains guide information and is generally written in PMT (Program Map Table).

Therefore, on the receiving side of the digital television, based on the control information included in the packet stream, the program of the selected channel is automatically tuned to the carrier including the carrier, and then only the program information of the channel selected from the multiplexed and transmitted packet stream is demultiplexed. By reconstructing, the viewer is provided with program information.

Such program information, in particular, video data is compressed based on the MPEG-2 Recommendation by a hybrid coding technique combining a stochastic coding technique with a temporal and spatial compression technique. Since the screen is composed using the correlation of, since the complete screen configuration is not achieved only with information on one screen, a GOP (Group Of Pictures) structure is used. That is, the data of several prediction screens (inter screens) including one reference screen (intra screens) including information on one complete screen are grouped into a group.

For example, referring to FIG. 1, which shows an example of an arrangement of picture types in a GOP, one GOP includes a picture of I picture composed of information about one complete picture, and a B consisting of a prediction picture for an I picture. / P You can see that it consists of 14 pictures.

Here, an I picture (Intra Picture) is an intra picture encoded with only one piece of picture information without using inter-frame prediction in order to secure independence of the GOP, and P picture (Predictive-Picture) and B picture (Bidirectionally Predictive). A picture) is an inter picture generated by performing prediction from an I picture that is an intra picture.

As described above, the P picture or the B picture is a prediction picture based on the I picture, and since the amount of change is very small, the P picture or the B picture in the GOP group may be represented by the I picture.

Therefore, if a memory capable of storing such image data of such an I picture is used frame-by-frame, it is possible to provide various functions such as storage, editing, copying and printing. It may be possible to provide a system for reproducing a still image, that is, a frame, for example, an instant scene such as an athletic game, or information required by a user, as a still image, and storing it as a printed matter. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described point, and an object of the present invention is to provide a user with a request for a still image while performing a normal viewing mode in a digital television. It is an object of the present invention to provide a still image printing apparatus of a digital television configured to display a still image sequentially and to print a still image selected by the user as printed matter.

In order to achieve the above object, in the present invention, the video data of the digital broadcast signal compression-coded in units of an image group including one infrastructure frame is decoded into video data before compression, and the decoded video data is decoded into an analog image. An apparatus for converting a signal into a digital television system and outputting the analog image signal as a still image, the apparatus comprising: a user operation block generating a user operation signal; Tuner and demodulation means for extracting compressed coded video data of a channel selected by a user from the digital broadcast signal; A frame memory configured to store a plurality of pieces of data about the infrastructure frame included in the compressed and encoded video data and to output the stored infrastructure frame in units of one frame; An MPEG decoder for restoring video data extracted from the tuner and the demodulator or video data stored in the frame memory to video data before compression encoding; Video signal processing means for converting the reconstructed video data into an analog video signal; Switching switching means for selectively providing the compressed coded video data extracted by the tuner and the demodulation means to the MPEG decoder or the frame memory; Display means for displaying the analog video signal converted by the video signal processing means as a moving picture or a still picture; A printer for printing video data decoded by the MPEG decoder; A printer interface for providing the image data decoded by the MPEG decoder to the printer based on a preset transmission standard; When the signal for requesting printing of the still image is applied in the user operation block, the switching switching unit is controlled to switch the image data provided from the frame memory to the MPEG decoder, and the still image selection signal is A system control means for controlling the MPEG decoder to provide the decoded video data of the decoded one frame to the printer through the printer interface, and to control the printer to print still images provided by the MPEG decoder. Provided is a still image printing apparatus for digital television.

1 is an exemplary diagram illustrating an example of a screen type arrangement in a GOP used in a general digital broadcast signal.

Fig. 2 is a block diagram showing a digital television with a still image printing apparatus according to the present invention.

<Description of the code | symbol about the principal part of drawing>

100: user operation block 200: system control block

300: switching switch 400: tuner and demodulation block

500: MPEG decoder 600: video signal processing block

650: display block 700: frame memory

800: printer interface 900: printer

Hereinafter, a still image printing apparatus of a digital television according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying FIG. In this case, since the present invention relates to the processing of the image data, description of the audio signal will be omitted in order to clarify the understanding of the present invention.

2 is a block diagram showing a digital television with a still image printing apparatus according to the present invention.

Referring to FIG. 2, a still image printing apparatus of a digital television according to the present invention is provided with a user operation block 100, a tuner and demodulation block 300, an MPEG decoder 500, and an image signal processing block 600. The system further comprises a system control block 200, a frame memory 700, a printer interface 800, and a printer 900 in the digital television of the digital television.

The user operation block 100 is composed of a key panel provided in a digital television system, or a remote control for the digital television. The key panel and the remote control are configured with a plurality of function keys including, for example, a print key, a selection key, and the like. And generate a key signal corresponding to a user's key operation, and provide the generated key signal to the system control block 200.

The system control block 200 controls the overall digital television system based on signals provided to the user operation block 100 or each component member of the digital television system.

In particular, the system control block 200 controls the switching switching block 400 to provide the MPEG decoder 500 with video data provided from the tuner and the demodulation block 300 when the normal viewing mode is performed, When a print signal is applied based on the key signal provided from 100, switching switching to provide the MPEG decoder 500 with image data provided from the frame memory 700 in one frame unit (i.e., I picture of the image group). Control block 400.

In addition, when the selection key signal is applied from the user control block 200 while displaying the still image corresponding to the image data of the I picture provided from the frame memory 700 in the display block 650, a time point at which the selection signal is applied The MPEG decoder 500 controls the MPEG decoder 500 to provide image data of the I picture decoded by the MPEG decoder 500 to the printer interface 800. At this time, each of the still images is displayed on the display block 650 in predetermined time units (for example, 5 seconds, 10 seconds, etc.), and the MPEG decoder 500 displays the still images on the display block 650. You will have reconstructed video data of the still picture.

The tuner and demodulation block 300 receives a digital broadcast signal provided from a terrestrial relay station or a satellite by tuning control of the system control block 200, converts the digital broadcast signal to an intermediate frequency, and then converts the converted intermediate signal. The frequency is demodulated into a bit stream through demodulation and error correction. The program information, i.e., video data of a predetermined channel selected by the control of the system control block 200 is extracted from the demodulated bit stream and provided to the MPEG decoder 500, and at the same time in a complete frame of the video data. The image information about the infrastructure frame, that is, the I picture, having the data of the information is also provided to the frame memory 700.

The switching switching block 400 switches the source of the video data to be provided to the MPEG decoder to one of the tuner and the demodulation block 300 and the frame memory 700 based on the switching control of the system control block 200. That is, based on the switching control of the system control block 200, one channel of video data provided from the tuner and the demodulation block 300 is continuously provided to the MPEG decoder 500, or a predetermined time unit in the frame memory 700. The MPEG decoder 500 provides image data of an I picture applied one frame at a time.

The MPEG decoder 500 converts the video data provided continuously from the tuner and the demodulation block 300 via the switching switching block 400 or the image data provided in a predetermined time unit from the frame memory 700 before compression encoding. Reconstructs the video data and provides the reconstructed data to the image signal processing block 600. Further, under the control of the system control block 200, reconstructed image data of the I picture, that is, data obtained by reconstructing the image data provided in a predetermined time unit from the frame memory 700 into the video data before compression encoding To the printer interface 800.

The video signal processing block 600 converts video data provided from the MPEG decoder 500 into an analog video signal of NTSC or PAL method, and provides the converted video signal to the display block 650. At this time, the converted analog video signal will be a moving picture or a still picture corresponding to the video data provided from the MPEG decoder 500.

The display block 650 displays a moving picture or a still picture of a specific channel by an analog video signal provided from the video signal processing block 600.

The frame memory 700 is a memory having a capacity for storing video data for a plurality of frames. The frame memory 700 stores a plurality of I pictures provided from a tuner and a demodulation block 300, and controls the system control block 200. When the switching switching block 400 is connected to the frame memory 700 side, the I-picture stored in a predetermined time unit is sequentially provided to the MPEG decoder 500.

The printer interface 800 transmits the image data provided from the MPEG decoder 500 to the printer 900 based on a preset transmission protocol (for example, IEEE 1284).

The printer 900 prints image data provided from the printer interface 800 under the control of the system control block 200.

Hereinafter, the operation process of the still image printing apparatus of the digital television which consists of the above-mentioned structural member is as follows.

First, by the switching control of the system control block 200, while the contact terminal of the switching control block 400 is connected to the tuner and demodulation block 300, the tuner and demodulation block 300 is a digital broadcast signal 300 After error correction and demodulation are demodulated into a bit stream, video data of a specific channel selected by the system control block 200 is extracted from the demodulated bit stream. The extracted video data is then provided to the MPEG decoder 500 via the switching control block 400. At this time, the video data provided to the MPEG decoder 500 is composed of a compression-coded group of images (GOP), so that the tuner and the demodulation block 300 separate data for an I picture of the image group. The frame memory 700 stores a plurality of image data of an I picture provided from the tuner and the demodulation block 300 according to its capacity.

The MPEG decoder 500 decodes the video data provided from the tuner and the auxiliary block 300 into the compressed code and the previous video data via the switching switching block 400, and decodes the decoded video data into the video signal processing block ( 600).

The video signal processing block 600 converts the video data provided from the MPEG decoder 500 into an analog video signal of the PAL or NTSC scheme, and provides the converted data to the display block 650.

In the display block 650, a predetermined image corresponding to the analog image signal provided by the image signal processing block 600 is displayed. In this case, the image displayed in the display block 650 may be a video of a program broadcast in a specific channel.

By the above-described process, a plurality of I pictures included in the video data of the channel which performs the normal viewing mode while performing the normal viewing mode are stored.

During such a normal viewing mode, when a print key signal is applied from the user operation block 100, the system control block 200 switches over the switching switch block 400, and the switching switch block 400 The contact terminal connected to the tuner and the demodulation block 300 is connected to the frame memory 700 side based on the switching control of the system control block 200.

As a result, the normal viewing mode is stopped, and the MPEG decoder 500 is provided with image data of an I picture stored in the frame memory 700 one frame at a predetermined time unit.

The MPEG decoder 500 decodes image data of an I picture sequentially provided one frame at a time from the frame memory 700 to a state before compression encoding, and provides the decoded image data to the image signal processing block 600. In the display block 650, the still picture based on the I picture is sequentially displayed in a predetermined time unit in the same manner as in the normal viewing mode described above.

As such, if the user operates a selection key for selecting a specific still image while the still images are sequentially displayed in the display block 650, the user operation block 100 selects a signal of a selection key corresponding to the user's key operation. And generates the generated selection key signal to the system control block 200.

The system control block 200 controls the MPEG decoder 500 to provide the printer interface 800 with data of the still image currently displayed on the display block 650 when a selection key signal is applied from the user operation block 100. On the other hand, the printer 900 is controlled to print image data provided from the printer interface 800.

The MPEG decoder 500 provides the printer interface 800 with data of the still image displayed in the display block 650 under the control of the system control block 200.

The printer interface 800 provides the image data provided from the MPEG decoder 500 to the printer 900 according to a predetermined transmission protocol (for example, IEEE1284), and the printer 900 is a system control block 200. The image data provided from the printer interface 800 is printed under the control of.

According to the present invention described above, the user can obtain a specific screen (still image) of a broadcast program displayed as a moving picture in the form of printed matter.

Claims (1)

It is provided in a digital television system that decodes the video data of the digital broadcast signal compression-coded by video group unit including one infrastructure frame into video data before compression, converts the decoded video data into an analog video signal and outputs it. An apparatus for printing the analog video signal as a still image, A user operation block for generating a user's operation signal; Tuner and demodulation means for extracting compressed coded video data of a channel selected by a user from the digital broadcast signal; A frame memory configured to store a plurality of pieces of data about the infrastructure frame included in the compressed and encoded video data and to output the stored infrastructure frame in units of one frame; An MPEG decoder for restoring video data extracted from the tuner and the demodulator or video data stored in the frame memory to video data before compression encoding; Video signal processing means for converting the reconstructed video data into an analog video signal; Switching switching means for selectively providing the compressed coded video data extracted by the tuner and the demodulation means to the MPEG decoder or the frame memory; Display means for displaying the analog video signal converted by the video signal processing means as a moving picture or a still picture; A printer for printing video data decoded by the MPEG decoder; A printer interface for providing the image data decoded by the MPEG decoder to the printer based on a preset transmission standard; When the signal for requesting printing of the still image is applied in the user operation block, the switching switching unit is controlled to switch the image data provided from the frame memory to the MPEG decoder, and the still image selection signal is A system control means for controlling the MPEG decoder to provide the decoded video data of the decoded one frame to the printer through the printer interface, and to control the printer to print still images provided by the MPEG decoder. Still image printing apparatus of digital TV.