JP2003348444A - Image signal processing apparatus and processing method - Google Patents

Abstract

(57) [Summary] [Problem] A state in which a reduced image of one image is displayed on a part of the screen from the state where one image is displayed on the entire screen and another image is displayed on another part of the screen When making the transition, the image transition on the screen is performed continuously and smoothly without discomfort. When a reception mode changes from a normal broadcast to a data broadcast, a conversion unit (108) reduces and displays an image based on a video signal (SV) on a predetermined number of screens from the entire screen to a final small screen. sequentially outputs the image signal V _1. At this time, the data processing unit 109 uses the image signal V _2P for still image display and the image signal V _3P for character / graphic display obtained from the data DD to display a predetermined number of screens from the final small screen to the entire screen. Cut out the image signal of the part sequentially,
Image enlargement processing is performed so that an image based on the extracted image signal is displayed on the entire screen, and image signals V ₂ ,
It is sequentially output V _3. The synthesizing unit 110 outputs the image signals V _{1 to} V
Combine and output ₃ .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image signal processing apparatus and a processing method suitable for a digital broadcast receiver capable of receiving a data broadcast, for example. More specifically, the present invention provides a transition from a state where one image is displayed on the entire screen to a state where a reduced image of one image is displayed on a part of the screen and another image is displayed on another part of the screen. At this time, the display position and reduction ratio of one image are changed stepwise, and the display range and enlargement ratio of another image are changed stepwise in accordance with this, so that the image on the screen is changed. The present invention relates to an image signal processing apparatus and processing method in which a transition is performed continuously and smoothly without a sense of incongruity.

[0002]

2. Description of the Related Art In a digital broadcasting system using a satellite or the like, there are a normal broadcasting in which only a moving image is displayed on the entire screen, and a data broadcasting in which a still image, a character graphic, and a moving image are displayed in combination. At the moment, broadcasters have shown many programs for data broadcasting as shown in FIG. 8B.
Broadcasting is performed so that reduced moving images are mixed and displayed with still images and character figures. In this case, the reduced moving image is displayed on a small screen.

[0003] When the mode changes from the normal broadcast reception mode to the data broadcast reception mode in response to a user operation, for example, FIG.
The display state of A is changed to the display state of FIG. In this case, it is difficult to intuitively understand where the moving image has moved, and the movement is single-shot and boring.

Therefore, conventionally, the display state of FIG.
It is considered that when obtaining the display state of, the display position and the reduction ratio of the moving image are gradually changed.

[0005]

By the way, as shown in FIGS. 9A to 9D, a general data broadcast screen is composed of a still image plane, a moving image plane, and a text / graphics plane. The moving picture plane is a reduced display screen of a moving image. The still image plane displays a background pattern. Characters and small figures are arranged on the character figure plane. The display position and size of the moving picture plane are specified in a BML (Broadcast Markup Language) sentence of the data broadcast. The moving image plane is displayed at the specified display position and size.

Here, as shown in FIG. 10, a moving image plane is superimposed on a still image plane, and a character / graphic plane is further superimposed on a moving image plane. That is, the moving image plane is located between the still image plane and the character / graphic plane. Therefore, as described above, when the display position and the reduction ratio of the moving image are changed stepwise, there is a problem that the moving image appears to creep under the character graphic so as to crawl. .
FIG. 11 shows a screen display example at an intermediate stage.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an image signal processing apparatus and an image processing method in which an image transition on a screen is performed continuously and smoothly without a sense of incongruity.

[0008]

An image signal processing apparatus according to the present invention displays a reduced image of one image on a part of the screen from a state where one image is displayed on the entire screen, and simultaneously displays another reduced image on the screen. An image signal processing device for transitioning to a state where another image is displayed on a portion, based on an image signal corresponding to one image, a screen portion of a predetermined number of steps from the entire screen to a part of the screen First image signal processing means for sequentially obtaining a first image signal for displaying one image at
Based on image signals corresponding to other images, to cut out an image signal of a screen portion of a predetermined number of steps from a portion of the screen to the entire screen, and to display another image based on the cut image signal on the entire screen. A second image signal processing means for sequentially obtaining a second image signal, a first number of stages of the first image signal sequentially obtained by the first image signal processing means, and a second image signal processing means for sequentially obtaining the second image signal. Synthesizing means for synthesizing the obtained predetermined number of stages of the second image signal for each stage to obtain an output image signal.

Further, according to the image signal processing method of the present invention, a reduced image of one image is displayed on a part of the screen from a state where one image is displayed on the entire screen, and another image is displayed on another part of the screen. An image signal processing method for causing a transition to a state in which an image is displayed, wherein one image is displayed on a screen portion of a predetermined number of steps from the entire screen to a part of the screen based on an image signal corresponding to the one image. A first step of sequentially obtaining a first image signal for displaying an image signal, and an image signal of a screen portion of a predetermined number of stages from a part of the screen to the entire screen based on image signals corresponding to other images. A second step of sequentially extracting a second image signal for displaying another image based on the extracted image signal on the entire screen, and a first step of a predetermined number of steps sequentially obtained in the first step
And a third step of obtaining an output image signal by synthesizing each of the image signals of the predetermined number of steps sequentially obtained in the second step with the image signal of the second step.

According to the present invention, transition from a state in which one image is displayed on the entire screen to a state in which a reduced image of one image is displayed on a part of the screen and another image is displayed on another part of the screen. It is to make it. For example, one image is a moving image, and the other images are still images and character figures.

The first image signal of each stage is obtained so that the display position and the reduction ratio of one image change stepwise. That is, based on the image signal corresponding to one image, the first image signal for displaying one image on the screen part of a predetermined number of steps from the entire screen to a part of the screen is sequentially obtained.

Accordingly, the second image signal of each stage is obtained so that the display range and the enlargement ratio of another image are changed stepwise. That is, based on an image signal corresponding to another image, an image signal of a screen portion of a predetermined number of steps from a part of the screen to the entire screen is cut out, and another image based on the cut out image signal is displayed on the entire screen. In order to obtain a second image signal.

Then, an output image signal is obtained by synthesizing the first image signal of the predetermined number of stages and the second image signal of the predetermined number of stages for each stage.

According to this output image signal, the following effects can be obtained. That is, since the display position and the reduction ratio of one image change stepwise, it becomes possible to intuitively know where the one image has moved. In addition, since the reduction ratio of one image gradually increases, the appearance becomes interesting. As the display position and reduction ratio of one image change stepwise, the display range and enlargement ratio of another image also change stepwise. Therefore, not only one image changes on the screen, but all the images including the other images change integrally, so that the image transition on the screen is performed continuously and smoothly without discomfort. Become.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration of a set top box (STB: Set Top Box) 100 for receiving a digital broadcast signal as an embodiment.

The set-top box 100 has a CP
U (Central Processing Unit), a memory having an internal control unit 101 for controlling the overall operation, a control program area for storing a control program for controlling the operation of the CPU, a work area for the CPU, etc. 102
And the user's remote control transmitter and key input unit (not shown)
Operation control unit 10 that outputs a control command according to the operation of
And 3.

The memory 102 and the operation control unit 103
It is connected to the internal control unit 101. In a control program area of the memory 102, a program for performing control corresponding to a control command sent from the operation control unit 103 to the internal control unit 101, a program for performing reception control in a tuner described later, and a normal program described later. A program for controlling image transition when the reception mode is changed from broadcasting to data broadcasting is stored.

The set-top box 100 extracts a digital broadcast signal of a predetermined channel from the digital broadcast signals of a plurality of channels received by a receiving antenna (not shown), demodulates the digital broadcast signal, and performs demodulation and error processing on the digital broadcast signal. Tuner 1 that performs correction processing and obtains broadcast data DB
04. This broadcast data DB is, for example, MP
EG2 (Moving Picture Experts Group 2) transport stream.

The set-top box 100 separates, from the broadcast data DB obtained by the tuner 104, video data VD, audio data AD, data DD such as a still image and a character graphic in data broadcasting, and an information signal relating to each data. The demultiplexer 105 is provided. The information signal separated by the demultiplexer 105 is supplied to the internal control unit 101.

The set top box 100 performs a data decompression decoding process on the video data VD separated by the demultiplexer 105, and outputs a video signal SV as an image signal.
An audio processing unit 106 that performs a data decompression decoding process on the audio data AD separated by the demultiplexer 105 to obtain an audio signal SA.

The set-top box 100 has a conversion unit 108 which performs an image reduction process on the video signal SV obtained by the video processing unit 107 when receiving a data broadcast under the control of the internal control unit 101. are doing.

In this case, when the receiving mode changes from the normal broadcast to the data broadcast, the conversion unit 108 displays an image based on the video signal SV on a predetermined number of screen portions from the entire screen to the final small screen. and sequentially outputs the image signal V ₁ of the for. After that, the conversion unit 108 continuously outputs the image signal V ₁ at the last stage. The conversion unit 10
8 receives the normal broadcast and outputs the video signal SV as it is without performing the reduction processing on the video signal SV.

For example, as shown in FIG. 2, a case where five stages of screen portions Q _{0 to} Q ₄ are set will be further described. Here, Q ₀ is the entire screen, and Q ₄ is the final small screen. Each screen portion is specified by the information of the respective positions p ₀ ~p ₄ and information in the horizontal and vertical size. Here, the position information specifying each screen portion and the size information are collectively referred to as “screen information”.

[0024] The screen information of the final small screen Q ₄ is specified in the BML sentence of data broadcasting. Internal control unit 10
1, based on the screen information of the entire screen are known in advance as the screen information of the small screen Q ₄ Q _0, the remainder of the screen portions Q ₁
Seek the screen information of ~Q _3.

The conversion unit 108 performs the following processing at each stage. In the first stage, and outputs the image signal V ₁ for displaying an image by the video signal SV to the entire screen Q _0. In this case, the conversion unit 108 outputs the video signal SV itself as an image signal V _1.

In the next stage, the screen portion Q₁To video signal
Image signal V for displaying an image by SV₁Is output. This
In the case of, the conversion unit 108 adds the screen portion Q to the video signal SV.
₁Perform image reduction processing according to the size of
Video signal of the screen portion Q ₁Time according to the position of
Image signal V₁Output as

In the next stage, the screen portion Q_TwoTo video signal
Image signal V for displaying an image by SV₁Is output. This
In the case of, the conversion unit 108 adds the screen portion Q to the video signal SV.
_TwoPerform image reduction processing according to the size of
Video signal of the screen portion Q _TwoTime according to the position of
Image signal V₁Output as

In the next stage, the screen portion Q_ThreeTo video signal
Image signal V for displaying an image by SV₁Is output. This
In the case of, the conversion unit 108 adds the screen portion Q to the video signal SV.
_ThreePerform image reduction processing according to the size of
Video signal of the screen portion Q _ThreeTime according to the position of
Image signal V₁Output as

[0029] In the last step, and outputs the image signal V ₁ for displaying an image by the video signal SV to the final small screen Q _4. In this case, the conversion unit 108 performs the image reduction process to match the size of the small screen Q ₄ to the video signal SV, the image signal V video signal after the reduction treatment at a timing corresponding to the position of the small screen Q ₄ Output as ₁ .

After that, the conversion unit 108 outputs an image signal V ₁ for displaying an image based on the video signal SV on the final small screen Q _4.
Is output continuously. That is, the conversion unit 108 performs the image reduction process to match the size of the small screen Q ₄ to the video signal SV, the image signal V ₁ the video signal after the reduction treatment at a timing corresponding to the position of the small screen Q ₄ Is repeatedly performed.

The set-top box 100 is controlled by the internal control unit 101 to operate the demultiplexer 1.
A data processing unit 109 generates an image signal V ₂ for displaying a still image and an image signal V ₃ for displaying a character / graphic image based on the data DD separated at 05 when receiving a data broadcast.

In this case, when the reception mode changes from the normal broadcast to the data broadcast, the data processing unit 109 outputs the still image display image signal V _2P and the character / graphic display image signal V _3P obtained from the data DD. Further, image signals of a screen portion of a predetermined number of stages from the final small screen to the entire screen are sequentially cut out, and image enlargement processing is performed so that an image based on each of the cut out image signals is displayed on the entire screen. Then, the image signals V ₂ and V ₃ at each stage are sequentially output. After that, the data processing unit 109 continuously outputs the final stage image signals V ₂ and V ₃ .

For example, as shown in FIG. 3, a further description will be given by taking as an example a case where five screen portions Q _{0 to} Q ₄ are set. Screen portion Q ₀ to Q ₄ of the five steps are the same as those described in FIG. 2, Q ₀ is the entire screen, Q ₄ is the final small screen a moving image is displayed.

The data processing section 109 performs the following processing at each stage. In the first stage, the image signals V _2P , V _3P
Cut more final small screen Q ₄ image signals corresponding to the respective image signals V ₂ performs image enlargement processing to the image according to the extracted respective image signals were is displayed on the entire screen Q _0, V ₃ and output these image signals V ₂ and V ₃ at timings corresponding to the position of the entire screen Q ₀ .

In the next stage, the image signal V_2P, V_3PMore pictures
Surface part Q_ThreeCut out the image signal corresponding to
The image based on each of the extracted image signals is
Body Q ₀Performs image enlargement processing so that
Issue V_Two, V_ThreeAnd the image signal V_Two, V_ThreeTo the whole screen Q₀
Is output at a timing corresponding to the position of.

In the next stage, the image signal V_2P, V_3PMore pictures
Surface part Q_TwoCut out the image signal corresponding to
The image based on each of the extracted image signals is
Body Q ₀Performs image enlargement processing so that
Issue V_Two, V_ThreeAnd the image signal V_Two, V_ThreeTo the whole screen Q₀
Is output at a timing corresponding to the position of.

[0037] In the next step, the image signal V _2P, cut out image signals corresponding to from screen portions Q ₁ V _3-Way, image as image by the cut out each of the image signals which is displayed on the entire screen Q ₀ The image signal V ₂ ,
Give V _3, and outputs at a timing corresponding the image signal V _2, V ₃ to the position of the entire screen Q _0.

In the last stage, an image signal corresponding to the entire screen Q ₀ is cut out from the image signals V _2P and V _3P , respectively.
Obtaining an image signal V _2, V ₃ image by the cut out each of the image signals has been that performs image processing to be displayed on the entire screen Q _0, the image signals V _2, V ₃ screen overall Q ₀ Output at the timing according to the position.

Thereafter, the data processing section 109 cuts out the image signals corresponding to the entire screen Q ₀ from the image signals V _2P and V _3P , respectively, and displays the image based on each of the cut image signals on the entire screen Q _0. Image processing is performed to obtain image signals V ₂ and V ₃ , and the image signals V ₂ and V ₃ are repeatedly output at a timing corresponding to the position of the entire screen Q ₀ .

Here, a still image plane (image signal V_2P)
And character graphic plane (V_3PAbout the cut out part
This will be described in further detail. For example, as shown in FIG.
And the horizontal size of the screen portion displaying the moving image is W
₀To W_N-1Suppose that it changes continuously in N steps until
You. At this time, the still image plane and the text / graphic plane
Fig. 5 shows the horizontal size of the cut-out part in
As you can see, w₀From w_N-1Changes continuously in N steps until
Will be. Horizontal direction of the screen part displaying the moving image
Size of direction is W_nThe still image plane and
Of the cut-out part of the
Size w _nAnd

As shown in FIG. 4, the x-coordinate (position in the horizontal direction) of the screen portion displaying the moving image is from 0 to X _{N -1.}
Are continuously converted in N steps, and at this time, x of the cut-out portion in the still image plane and the character / graphic plane is
The coordinates will be changed from _x0 to 0 in N steps. When the x-coordinate of the screen portion displaying the moving image is _Xn , the x-coordinate of the cutout portion in the still image plane and the character / graphic plane is _xn .

First, for simplicity, let us consider a case where the size of the moving image plane is the same as the size of the still image plane and the character / graphic plane. In this case, with respect to the horizontal direction of the _{size, W n: W 0 = w} 0: w n w n = w 0 × W 0 / W n _{So, w n = W N-1} × W 0 / W n ··· (1)

[0043] In addition, with respect to the x-coordinate (horizontal _{position), X n: W n =} (x 0 -x n): w 0 x n = x 0 -w 0 , so _{× X n / W n, x} n = X _N-1 -W _N-1 × X _n / W _n (2)

Further, considering the case where the size of the moving image plane is different from the size of the still image plane and the character / graphic plane, the expressions (1) and (2) are respectively expressed by the following expressions (3) and (4). It looks like an expression. Actually, the data of the moving image plane is transmitted as data of 1920 × 1080 dots, for example, while the data of the still image plane and the character / graphic plane is transmitted as data of 960 × 540 dots. _{w n = (W N-1} × W 0 / W n) × w N-1 / W 0 ··· (3) x n = (X N-1 -W N-1 × X n / W n) × w _N-1 / W ₀ (4)

As described above, when the horizontal size of the screen portion for displaying a moving image is W _n and its x coordinate is X _n ,
The horizontal size w _n and the x-coordinate x _n of the cutout portion of the still image plane and the character / graphic plane are determined by Expressions (3) and (4), respectively.

Although the detailed description is omitted, the vertical size and the y-coordinate (position in the vertical direction) of the cutout portion of the still image plane and the character / graphic plane are also described.
It is determined by a similar calculation formula.

Returning to FIG. 1, set top box 100 displays image signal V ₁ for displaying a moving image output from conversion unit 108 and a still image output from data processing unit 109. and an image signal V ₃ and the synthesizing section 110 for synthesizing for displaying the image signals V ₂ and character graphic for.

When receiving a data broadcast, the data processing unit 1
09, the image signals V ₂ and V ₃ are output.
10, still picture plane (image signals V _2), the moving picture plane (image signals V _1), a character graphic plane (image signal V ₃₎
(See FIG. 10), and a combined image signal is output. Since the image signals V ₂ and V ₃ are not output from the data processing unit 109 during reception of a normal broadcast,
The synthesizing unit 110 outputs the image signal V output from the converting unit 108.
₁ (video signal SV) is output as it is.

The image signal output from the synthesizing unit 110 is supplied to a monitor device 120 as an image display. Note that the audio signal SA output from the audio processing unit 108 described above is supplied to the speaker 130.

Next, the set-top box 1 shown in FIG.
00 will be described. The tuner 104 extracts a digital broadcast signal of a predetermined channel from the digital broadcast signals of a plurality of channels received by the receiving antenna, and further performs demodulation processing and error correction processing on the digital broadcast signal, and the broadcast data DB can get.

The broadcast data DB output from the tuner 104 is supplied to a demultiplexer 105. The demultiplexer 105 separates the video data VD, the audio data AD, the data DD such as a still image and a character graphic in data broadcasting, and information signals related to each data from the broadcast data DB. The information signal separated by the demultiplexer 105 is supplied to the internal control unit 101.

The audio data AD, video data VD and data DD separated by the demultiplexer 105
Are the audio processing unit 106 and the video processing unit 1
07 and the data processing unit 109.

In the audio processing unit 106, the audio data AD is subjected to decompression and decoding processing to generate an audio signal SA. In the video processing unit 107,
The video data VD is subjected to decompression decoding to generate a video signal SV.

When receiving a normal broadcast, the video processing unit 10
The video signal SV output from 7 is output as it is from the synthesis unit 110 via the conversion unit 108. Then, the video signal SV is supplied to an external monitor device 120.

As a result, a moving image related to the broadcast data DB output from the tuner 104 is displayed on the entire screen of the monitor device 120. Also, the audio processing unit 108
Is supplied to the speaker 130. From the speaker 130, a sound related to the broadcast data DB output from the tuner 104 is output.

Next, a description will be given of an operation in the case where an instruction to change the reception mode from normal broadcast to data broadcast is issued by a user's input operation using a remote control transmitter or a key input unit (not shown).

When the reception mode changes from the normal broadcast to the data broadcast, the conversion unit 108 provides an image signal for displaying an image based on the video signal SV on a predetermined number of screen portions from the entire screen to the final small screen. sequentially output the V _1. After that, the conversion unit 108 outputs the image signal V at the last stage.
Outputs ₁ continuously.

The data processing section 109 generates and outputs an image signal V ₂ for displaying a still image and an image signal V ₃ for displaying a character / graphic based on the data DD when receiving a data broadcast. When the reception mode changes from the normal broadcast to the data broadcast, the data processing unit 109 converts the final small screen from the still image display image signal V _2P and the character / graphic display image signal V _3P obtained from the data DD. Image signals of a predetermined number of stages of the screen portion extending to the entire screen are sequentially cut out, and image enlargement processing is performed so that an image based on the cut-out image signals is displayed on the entire screen, and image signals V ₂ and V at each stage are obtained. ₃ is sequentially output. Then, the data processing unit 1
09 continuously outputs the image signals V ₂ and V ₃ at the last stage.

The image signal V ₁ for displaying a moving image output from the conversion unit 108 is supplied to the synthesizing unit 110.
The synthesizing unit 110 is further supplied with an image signal V ₂ for displaying a still image and an image signal V ₃ for displaying a character / graphic output from the data processing unit 109. The synthesizing unit 110 superimposes a still image plane (image signal V ₂ ), a moving image plane (image signal V ₁ ), and a character / graphic plane (image signal V ₃ ) in this order to generate a synthesized image signal. You. Then, the synthesizing unit 11
The image signal output from 0 is supplied to an external monitor device 120.

As a result, on the screen of the monitor device 120, a still image and a data broadcast image in which a character graphic and a moving image are combined are displayed. In this case, when the reception mode changes from normal broadcast to data broadcast,
The screen portion on which the moving image is displayed is sequentially reduced from the entire screen to become a final small screen, and the cutout position and the enlargement ratio of the still image and the character graphic also change accordingly. Then, the state where the moving image is finally displayed on the small screen continues.

FIGS. 6A to 6D show an example of image transition when the reception mode changes from normal broadcast to data broadcast. This example is an example of transition in five stages. In the first stage, as shown in FIG. 6A, a moving image is displayed on the entire screen. Thereafter, in the second, third, and fourth stages, as shown in FIGS. 6B, 6C, and 6D, the screen portion on which the moving image is displayed is sequentially reduced. In addition, the enlargement ratio of the still image and the character / graphic figure becomes smaller and the display range becomes wider. At the last stage, as shown in FIG. 6E, the moving image is displayed on the final small screen, and the still image and the character graphic are displayed in the entire range.

The flowchart of FIG. 7 shows an example of a control operation relating to image signal processing by the internal control unit 101 when the reception mode changes from normal broadcast to data broadcast. This example is intended to out screen portion Q ₀ to Q ₄ of assuming a case that is set (see FIGS. 2 and 3).

[0063] If there is the receiving mode change operation to the data broadcast from the normal broadcast, in step ST1, the screen information of the screen information the entire screen are known in advance (the size information and position information) Q ₀ of the small screen Q ₄ , The screen information of the remaining screen parts Q _{1 to} Q ₃ is obtained. The screen information of each of the screen portions Q _{0 to} Q ₄ is defined as A (0) to A (4) in the memory 102.
To be stored. The operation in step ST1 may be performed in advance when receiving a normal broadcast.

Next, in step ST2, the count value N of the counter is reset to zero. Then, step ST3
In, based on A (N), and to perform the image reduction process to output an image signal V ₁ to the conversion unit 108. At the same time, the cutout portions of the still image and the character / graphic plane are obtained based on A (N), and the data processing unit 109 is caused to perform the cutout processing and the image enlargement processing to output the image signals V ₂ and V ₃ . Then, the synthesizing unit 110 superimposes and outputs the image signals V _{1 to} V ₃ .

Next, in step ST4, the count value N is incremented. Then, in step ST5, N ≧
5 is determined. When N ≧ 5, the processing up to the final stage has already been completed, and the processing ends. On the other hand, if N ≧ 5, the process returns to step ST3, and the processing based on the next A (N) is performed. The flowchart of FIG. 7, out of the screen part Q ₀ ~
Is obtained by assuming that Q ₄ is set, the number of stages is also a similar control operation otherwise.

As described above, according to the present embodiment, when the reception mode is changed from the normal broadcast to the data broadcast, the display position and the reduction ratio of the moving image are changed stepwise, and the entire screen is changed. From the state where the moving image is displayed to the state where the moving image is finally displayed on the small screen. Therefore, it becomes possible to intuitively understand where the moving image has moved. Also, since the reduction ratio of the image gradually increases, the appearance becomes interesting.

Further, according to the present embodiment, when the reception mode is changed from the normal broadcast to the data broadcast,
As the display position and the reduction ratio of the moving image change stepwise, the enlargement ratio of the still image and the character graphic decreases, and the display range thereof increases. Therefore, not only the moving image but also all the images including the still image and the character graphic change integrally, so that the image transition on the screen is performed continuously and smoothly without a sense of incongruity.

In the above-described embodiment, when a reception mode is changed from a normal broadcast to a data broadcast, a still image and a character graphic are displayed, so that a moving image is displayed on a small screen. Although the present invention is applied to a device that changes the state, the present invention also changes the display state so that a moving image is displayed on a small screen in order to display some image together with the moving image. It is suitable to be applied at the time. Further, the image moving from the entire screen display to the small screen display is not limited to a moving image, but may be a still image or a character graphic.

In the above-described embodiment, the position of each display portion of the moving image moves linearly when the reception mode is changed from the normal broadcast to the data broadcast. For example, P ₀ to P ₄ in FIG. 2 is present in the same straight line. It may be configured such that the position of each display portion of the moving image moves on a predetermined curve. Thereby, the visual effect can be further enhanced.

In the above-described embodiment, the image reduction processing for a moving image, the cutout processing for a still image and a character graphic, the image enlargement processing, and the processing for superimposing a moving image plane with a still image plane and a character graphic plane are performed by hardware. However, it is obvious that these processes can be performed by software.

[0071]

According to the present invention, a reduced image of one image is displayed on a part of the screen from the state where one image is displayed on the entire screen, and another image is displayed on another part of the screen. When transitioning to a state where the image is shifted, the display position and reduction ratio of one image are gradually changed, and the display range and enlargement ratio of another image are gradually changed accordingly. In addition, the image transition on the screen is performed continuously and smoothly without discomfort.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a set-top box as an embodiment.

FIG. 2 is a diagram for explaining image reduction processing on a moving image.

FIG. 3 is a diagram illustrating an image cutout process and an image enlargement process for a still image and a character graphic.

FIG. 4 is a diagram illustrating a change in a screen portion displaying a moving image.

FIG. 5 is a diagram showing a change in a cutout portion of a still image & character graphic plane.

FIG. 6 is a diagram illustrating an example of image transition when a reception mode changes from a normal broadcast to a data broadcast.

FIG. 7 is a flowchart illustrating an example of a control operation related to image signal processing when the mode is changed to a data broadcast reception mode.

FIG. 8 is a diagram illustrating an example of a screen change when a reception mode changes from a normal broadcast to a data broadcast.

FIG. 9 is a diagram for explaining a general data broadcast screen.

FIG. 10 is a diagram for explaining superposition of each of a still image plane, a moving image plane, and a character / graphic plane.

FIG. 11 is a diagram showing an example of a conventional screen display at an intermediate stage when the reception mode is changed to data broadcasting.

[Explanation of symbols]

100: set-top box, 101: internal control unit, 102: memory, 103: operation control unit, 104: tuner, 105: demultiplexer, 106: audio processing unit , 107: Video processing unit, 108: Conversion unit, 109: Data processing unit, 110: Synthesizing unit, 120: Monitor device, 130: Speaker

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H04N 5/278 H04N 5/44 Z 5/44 5/445 Z 5/445 G09G 5/36 520L F-term (reference) 5C023 AA02 AA11 AA18 AA38 BA11 CA01 CA05 DA04 EA03 5C025 BA27 BA28 CA02 CA09 CA11 CB10 DA01 5C082 AA02 BA02 BA12 BA27 BB03 BB22 BC05 CA32 CA52 CA55 CA76 CB05 DA63 DA89 MM10

Claims (3)

[Claims] 1. A state in which one image is displayed on the entire screen is changed to a state in which a reduced image of the one image is displayed on a part of the screen and another image is displayed on another part of the screen. An image signal processing apparatus for displaying the one image on a screen part of a predetermined number of steps from the entire screen to a part of the screen based on an image signal corresponding to the one image. First image signal processing means for sequentially obtaining a first image signal; and an image signal of a screen portion of a predetermined number of stages from a part of the screen to the entire screen based on an image signal corresponding to the other image. And a second image signal processing unit for sequentially obtaining a second image signal for displaying the other image based on the extracted image signal on the entire screen, and sequentially using the first image signal processing unit. The predetermined number of steps obtained A synthesizing unit for synthesizing the first image signal of the floor and a predetermined number of stages of the second image signal sequentially obtained by the second image signal processing unit for each stage to obtain an output image signal; An image signal processing device characterized by the above-mentioned. 2. The image signal processing apparatus according to claim 1, wherein said one image is a moving image, and said another image is a still image and a character graphic. 3. A transition from a state in which one image is displayed on the entire screen to a state in which a reduced image of the one image is displayed on a part of the screen and another image is displayed on another part of the screen. An image signal processing method for displaying the one image on a screen part of a predetermined number of steps from the entire screen to a part of the screen based on an image signal corresponding to the one image. A first step of sequentially obtaining a first image signal, and, based on an image signal corresponding to the other image, cutting out an image signal of a screen part of a predetermined number of steps from a part of the screen to the entire screen, A second step of sequentially obtaining a second image signal for displaying the other image based on the extracted image signal on the entire screen, and a second step of a predetermined number of steps sequentially obtained in the first step. 1
And a third step of synthesizing the image signal of the predetermined number of stages and the second image signal of the predetermined number of stages sequentially obtained in the second step for each stage to obtain an output image signal. Image signal processing method.