JP2000023030A - Video signal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct a multiscreen that corresponds to user's taste by transmitting plural programs that are mutually related through digital television broadcasting and receiving the programs. SOLUTION: This device is provided with plural video decoding circuits 25A to 25C which respectively decode plural video programs that undergo digital processing, memory controllers 26A to 26C which freely set display positions and enlargement and reduction ratios of video signals that are respectively decoded by plural decoding circuits, image memories 27A to 27C and a compositing circuit 29 which composites each video signal. When a program that is mutually related to plural channels is transmitted with the operation of a remote commander 35, a user lays out the images of each channel on one screen in accordance with the user's taste and can form a multiscreen. Also, the user can designate the position and size of an image, cut out a desired part from one image to display and extract only a moving part to display.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal display device suitable for use in a digital television broadcast receiver to which a program is transmitted using multiple channels.

[0002]

2. Description of the Related Art A multi-screen television receiver which displays a plurality of program screens on one screen is known. In conventional analog television broadcasting,
The number of channels is limited, and independent programs are broadcast for each channel. For this reason, even when generating a multi-screen in which a plurality of programs are collectively displayed on one screen, programs of different channels are simply displayed on the main screen and some sub-screens.

[0003] That is, conventionally, as a method of displaying a plurality of video programs collectively on one screen, the entirety of the two video programs is compressed as necessary and then displayed in combination, or the main video program and the main video program are displayed together. Either two or more sub-picture programs are combined and displayed in a necessary compression, or the whole is displayed. The purpose of displaying the sub-picture program is to merely display it so that its outline can be confirmed. The contents of the sub-picture program had little relevance to the display of the main picture program.

[0004]

As digital television broadcasting becomes more widespread in the future, a plurality of video programs will be multiplexed on one transmission channel by digital processing, and a plurality of programs which are related to each other will be produced. Will be broadcast on this channel.

[0005] For example, in a baseball broadcast, in addition to a main baseball broadcast program, a program viewed from a camera mounted on the back of the net and a program viewed from a camera mounted on a ceiling are respectively provided. Could be sent using separate channels. In swimming and on-land broadcasting, in addition to the main baseball broadcasting program, it is conceivable that a program showing the state of each player is sent using a different channel.

[0006] As described above, when related programs are transmitted over multiple channels, sub-pictures are not simply superimposed on a main picture and displayed, but a meaningful program from these related programs is used. It is desired that the screen can be freely configured by the user.

Accordingly, an object of the present invention is to provide a video signal display device capable of forming a multi-screen according to a user's preference from a plurality of programs related to each other.

[0008]

SUMMARY OF THE INVENTION The present invention provides a plurality of decoding means for respectively decoding a plurality of digitally processed video programs, a display position of a video signal decoded by the plurality of decoding means, and an enlargement or reduction ratio. Is a video signal display device comprising: a display setting means for freely setting the video signal;

According to the present invention, the digitally processed video program is transmitted by the motion compensated prediction coding method, and based on the motion information added to the video program,
The fast moving part in the video program is extracted and displayed.

In the case where programs related to each other are transmitted to a plurality of channels, the screen of each channel can be laid out on one screen according to the user's preference to form a multi-screen. Can specify the position and size of the screen, cut out and display a desired part from one screen, or extract and display only the moving part. For this reason, the user
You can enjoy broadcasting while watching the multi-screen according to your preference.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. INDUSTRIAL APPLICABILITY The present invention is used for a television receiver that receives digital television broadcasting in which programs related to each other are transmitted to a plurality of channels.

FIG. 1 shows an example of digital television broadcasting in which programs related to each other are transmitted to a plurality of channels. The example shown in FIG. 1 shows an example in which a program for relaying a swimming race is transmitted.

In FIG. 1, a camera 1 is for broadcasting a main program. The camera 1 relays a state of a competitor or a venue, which is a main part of the live swimming race.
Of course, in addition to the camera 1, the main program broadcasts an image of a plurality of cameras placed in the stadium by appropriately switching an optimal image according to the situation at that time. .

The camera 2 is mounted, for example, on the ceiling of a stadium, and relays the entire situation in which the players 4A to 4F are competing. The camera 3 is, for example, an underwater camera, and relays a state near the goal from underwater.

These cameras 1, 2 and 3
Are transmitted using different channels, respectively, a screen as shown in FIG. 2A is broadcast in the channel of camera 1, a screen as shown in FIG. 2B is broadcast in the channel of camera 2, and , A screen as shown in FIG. 2C is broadcast.

In the television receiver to which the present invention is applied, as described above, when programs related to each other are transmitted to a plurality of channels, the screen of each channel is changed to one screen according to the user's preference. It is laid out on top so that a multi-screen can be formed. At this time, the user can specify the position and size (enlargement or reduction ratio) of the screen, and can cut out and display a desired part from one screen, or display the part following a moving part. it can.

FIG. 3 shows an example in which screens of a plurality of channels are combined to form a multi-screen. FIG. 3A shows an image of the main program taken by the camera 1.
FIG. 3B shows an image of a program of the entire stadium photographed by the camera 2, and FIG. 3C shows a multi-screen formed from these.

As shown in FIG. 3C, the multi-screen is provided with a display area 11 for the main program, a display area 12 for displaying the state of the entire competitor, and a display area 13 for displaying the state of a specific competitor. Can be The screen of the display area 11 of the main program is obtained by reducing and displaying the image of the channel of the main program shown in FIG. 3A.
The screen of the display area 12 showing the state of the entire athlete is obtained by extracting and displaying only the places where the movement is intense from the screen of the program channel of the entire stadium shown in FIG. 3B. In the competition, the place where the competitor is swimming is a place where the movement is intense. Therefore, the screen that extracts only the place where the movement is intense is a screen that follows the movement of each competitor. The screen showing the state of the specific competitor is obtained by extracting and displaying the state of the specific competitor from the program screen of the entire stadium shown in FIG. 3B.

As described above, in the television receiver to which the present invention is applied, when programs related to each other are transmitted to a plurality of channels, the screen of each channel is changed to one screen according to the user's preference. To form a multi-screen, the user can specify the position and size of the screen, cut out and display a desired part from one screen, and extract only the moving part. Can be displayed. For this reason, the user can see the screen according to his or her preference.

That is, in the above-described example of the swimming race, the main program channel normally broadcasts a screen which many viewers prefer, such as the state of the leading competitor. However, not all viewers always want to see such a screen, and individual viewers often want to see the state of the competitor they support. In addition, he often wants to see not only the state of the leading competitor or the competitor he is supporting, but also the state of the entire competition from the entire screen of each competitor.

In such a case, as shown in FIG. 3C, the main program is displayed in the main program display area 11, and the competitors 4A to 4F are extracted and displayed from the entire screen in the display area 12. And display area 1
3, a state of a specific competitor, for example, the competitor 4C is enlarged and displayed. As a result, the user can see the main program, understand the state of the competitor 4C who is supporting him, and also understand the state of the entire competition.

FIG. 4 shows an example of a television receiver to which the present invention is applied. This television receiver receives digital television broadcasts in which programs related to each other are transmitted to a plurality of channels, and can form a multi-screen from each program as described above. is there.

In FIG. 4, an antenna 21 receives a terrestrial digital television broadcast signal. In digital terrestrial television broadcasting, VHF or UHF
The frequency band of the television channel of the band is used. In digital television broadcasting, as an image compression method, for example, Moving Picture Exposure (MPEG) is used.
erts Group) 2 is used.

The MPEG2 system compresses and encodes a video signal by using motion compensation prediction coding and DCT (Discrete Cosine Transform).
(Intra) picture, P (Predicti) picture, and B
(Bidirectionally Predictive) 3 called picture
Kind of screen is sent. In an I picture, DCT coding is performed using pixels of the same frame. In the P picture, DCT coding using motion compensation prediction is performed with reference to an already coded I picture or P picture. In a B picture, DCT coding using motion prediction is performed with reference to an I picture or a P picture before and after the B picture.

The received signal from the antenna 21 is sent to a tuner circuit 22. A channel setting signal is supplied from the microprocessor 20 to the tuner circuit 22. In the tuner circuit 22, a receiving channel is set based on a channel setting signal from the microprocessor 20. The tuner circuit 22 demodulates the signal of the selected reception channel, and the tuner circuit 22 outputs an MPEG2 data stream of the selected channel.

The output of the tuner circuit 22 is supplied to an error correction processing circuit 23. The error correction circuit 23 performs an error correction process. As an error correction method, for example, a Reed-Solomon code is used for an outer code, and a convolutional code is used for an inner code. Viterbi decoding, deinterleaving, and decoding of a Reed-Solomon code are performed by the error correction circuit 23. It is.

The output of the error correction processing circuit 23 is supplied to a demultiplexer 24. In MPEG2 television broadcasting, TS (Transport
Stream) packet sends data. This TS packet includes a header section and a data section, and a packet synchronization code, a packet identifier (PID), and the like are sent to the header section.

The demultiplexer 24 sorts video packets and audio packets of a predetermined program under the control of the microprocessor 20 by referring to the PID of the packet header. By the demultiplexer 20,
For example, channels that broadcast the screen of the main program as described above, channels that broadcast the entire screen of the stadium, and channels that broadcast the underwater situation near the goal Then, video packets and audio packets of three channels are extracted.

For example, the video packet of the channel broadcasting the screen of the main program is sent to the video decoding circuit 25A, and the video packet of the channel broadcasting the entire screen of the stadium is transmitted to the video decoding circuit 25A. 2
The video packet of the channel that is sent to 5B and broadcasts the underwater situation near the goal is sent to the video decoding circuit 25C. The audio packet is sent to the audio decoding circuit 32.

The video decoding circuits 25A to 25C are provided with MP
The video signal compressed by the EG2 method is expanded and the digital video signal is decoded. In the MPEG2 system, a video signal is compression-coded by motion compensation prediction coding and DCT, and an I picture, a P picture,
Three types of screens called B pictures are sent.

Each of the video decoding circuits 25A to 25C includes a variable length code decoding circuit, an inverse quantization circuit, an IDCT circuit, a motion compensation circuit, and a frame memory for storing data of a reference screen.

FIG. 5 shows video decoding circuits 25A to 25C.
FIG. In FIG. 5, an input terminal 51
Is supplied with an MPEG2 bit stream. This bit stream is temporarily stored in the buffer memory 52.

The output of the buffer memory 52 is supplied to a variable length decoding circuit 53. The variable length decoding circuit 53 decodes the variable length code. The variable length decoding circuit 53 outputs DCT coefficient data and data such as a motion vector, a prediction mode, and a quantization scale. The DCT coefficient data is supplied to the inverse quantization circuit 54. The quantization scale of the inverse quantization circuit 54 is set according to the quantization scale information from the variable length decoding circuit 53.

The motion vector information and the prediction mode information are
It is supplied to the motion compensation circuit 57. The inverse quantization circuit 54 inversely quantizes the DCT coefficient data. The output of the inverse quantization circuit 54 is supplied to the IDCT circuit 55. ID
The output of the CT circuit 55 is supplied to the adding circuit 56. The output of the motion compensation circuit 57 is supplied to the addition circuit 56.

The frame memory 58 holds two frames of video for a reference screen and one field image for converting a frame image in a macroblock into a field when outputting a B picture. It is.

In an I picture, DCT coding is performed using pixels of the same frame. Therefore, in the case of an I picture, one frame of screen data is obtained from the IDCT circuit 55. This image data is added to the addition circuit 5
6 and output from the output terminal 59. The image data at this time is stored in the frame memory 58 as reference screen data.

In the P picture, DCT coding using motion compensation prediction is performed with reference to the I picture or the P picture. For this reason, the difference from the reference screen is output from the IDCT circuit 55. The data of the reference screen is stored in the frame memory 58. Also, the motion compensation circuit 5
7, the motion vector is supplied from the variable length decoding circuit 53. When decoding a P picture, the image of the reference frame from the frame memory 58 is motion-compensated by the motion compensation circuit 57 and supplied to the addition circuit 56. The data of the reference image motion-compensated by the adding circuit 56 and the ID
The difference data from the CT circuit 55 is added. Thereby, screen data of one frame is obtained. This image data is output from the output terminal 59. Then, the image data at this time is stored in the frame memory 58 as reference screen data.

In a B picture, DCT coding using motion prediction is performed with reference to an I picture or a P picture before and after the B picture. For this reason, the IDCT circuit 55 outputs a difference from the previous and next reference screens. The data of the reference screens before and after this is stored in the frame memory 58. When decoding a B picture, the images of the previous and next reference frames from the frame memory 58 are motion-compensated by the motion compensation circuit 57 and supplied to the addition circuit 56. The addition circuit 56 adds the data of the reference image before and after the motion compensation and the difference data from the IDCT circuit 55. Thereby, screen data of one frame is obtained. This image data is output from the output terminal 59.

In FIG. 2, video decoding circuits 25A-
From 25C, digital video signals of each channel are output. The output of the video decoding circuit 25A is temporarily stored in an image memory 27A via a memory controller 26A. The output of the video decoding circuit 25B is temporarily stored in the image memory 27B via the memory controller 26B. The output of the video decoding circuit 25C is temporarily stored in an image memory 27C via a memory controller 26C.

The memory controllers 26A to 26C control the image memory 2 under the control of the microprocessor 20.
7A to 27C are controlled. The microprocessor 20 receives a user input from the remote commander 35. By controlling the read / write of the memories 27A to 27C according to the user input by operating the remote commander 35, the position and size (enlargement or reduction ratio) of the screen of each channel can be set freely.

As described above, in the digital television broadcasting of the MPEG2 system, a motion vector is sent, and as shown in FIG. 5, the motion vector is output from the variable length decoding circuit 53. . From this motion vector, it is possible to detect a portion where the motion is sharp on the screen.

The motion vectors are output from the video decoding circuits 25A to 25C, and the motion vectors are supplied to the motion area extraction circuits 28A to 28C, respectively. The moving area extraction circuits 28A to 28C detect a portion of the screen where the movement is sharp. In the case of extracting a rapidly moving part from the screen, the part detected by the moving area extracting circuits 28A to 28C is extracted from the image memories 27A to 27C.

The outputs of the video decoding circuits 25A to 25C via the image memories 27A to 27C are supplied to a synthesizing circuit 29. The combining circuit 29 combines the video signals of each channel. The output of the synthesis circuit 29 is supplied to the analog conversion circuit 30. The analog conversion circuit 30 converts the digital video signal into an analog video signal. This analog video signal is output from the output terminal 31.

The voice packet from the demultiplexer 24 is sent to a voice decoding circuit 32, which converts the voice packet into a digital voice signal. Digital audio signals have a precision of 16 bits or more. The output of the audio decoding circuit 32 is supplied to the analog conversion circuit 33. Analog conversion circuit 33
Thus, the digital audio signal is converted into an analog audio signal. This analog audio signal is output from the output terminal 34.

As described above, in the television receiver to which the present invention is applied, by operating the remote commander 31, the image memories 27A to 27C can be freely read / written under the control of the microprocessor 20. Can be set to As a result, the position and size (enlargement / reduction) of the screen of each channel when configuring a multi-channel
Can be set freely. In addition, the video decoding circuits 25A to 25A
25C outputs a motion vector, and the motion vector is supplied to each of the motion region extraction circuits 28A to 28C.
The moving area extracting circuits 28A to 28C detect a portion on the screen where the movement is sharp. This motion area extraction circuit 28
By extracting the part detected by A to 28C, it is possible to extract only a part with a sharp movement on the screen. Therefore, in the case where programs related to each other are transmitted to a plurality of channels, the position and size of the screen are designated according to the user's preference, and further, only the moving part is extracted, and the user selects Can be formed.

In the above-described example, the screen that the user wants to extract is extracted from one screen by designating an area. However, an index signal is added to the transmitted signal, and the index signal is added. An area to be extracted may be specified based on the index signal.

In the above-mentioned example, digital terrestrial television broadcasting has been described. However, the present invention relates to digital television broadcasting of satellite broadcasting and CAT broadcasting.
Of course, it can be applied to V broadcasting.

[0048]

According to the present invention, when programs related to each other are transmitted to a plurality of channels,
The screen of each channel can be laid out on one screen according to the user's preference to form a multi-screen, and the user can specify the position and size of the screen,
A desired part can be cut out from the screen and displayed, or only a moving part can be extracted and displayed.
Therefore, the user can enjoy the broadcast while watching the multi-screen according to his / her preference.

[Brief description of the drawings]

FIG. 1 is a schematic diagram used for describing digital television broadcasting.

FIG. 2 is a schematic diagram used for describing a television receiver to which the present invention is applied.

FIG. 3 is a schematic diagram used for describing a television receiver to which the present invention is applied.

FIG. 4 is a block diagram illustrating an example of a television receiver to which the present invention is applied.

FIG. 5 is a block diagram of an example of a video decoding circuit in a television receiver to which the present invention has been applied.

[Explanation of symbols]

25A, 25B, 25C ... video decoding circuit, 26
A, 26B, 26C: Memory controller, 27
A, 27B, 27C: image memory, 28A, 28
B, 28C: motion extraction circuit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 7/081 H04N 7/137 Z 7/32 F-term (Reference) 5C023 AA02 AA14 AA27 AA38 BA15 DA04 DA08 5C059 KK37 KK38 MA00 MA01 MA23 ME01 NN24 PP04 RA06 RC32 RF05 UA33 5C063 AA01 AB03 AB11 AC01 BA12 CA09 CA11 CA36 5C082 AA02 BA20 BA41 BB15 CA32 CA55 DA26 MM05

Claims (4)

[Claims] 1. A plurality of decoding means for decoding a plurality of digitally processed video programs, respectively; A video signal display device comprising: means for synthesizing a video signal whose display position and enlargement or reduction ratio have been set by the display setting means. 2. The digitally processed video program is transmitted in a motion compensated predictive coding system. Based on motion information added to the video program, a portion of the video program where motion is severe is extracted. The video signal display device according to claim 1, wherein the video signal is displayed. 3. The video signal display device according to claim 1, wherein the plurality of video programs are programs related to each other. 4. The video signal display device according to claim 1, wherein said plurality of video programs are transmitted on each channel in digital television broadcasting.