JP4066714B2 - Image signal processing apparatus and processing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an image signal processing apparatus and method suitable for application to, for example, a digital broadcast receiver capable of receiving data broadcasts. Specifically, the present invention makes a 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. When changing the display position and reduction ratio of one image in steps, the display range and enlargement ratio of other images are changed step by step. The present invention relates to an image signal processing apparatus and processing method in which transition is performed continuously and smoothly without a sense of incongruity.
[0002]
[Prior art]
In digital broadcasting systems using satellites or the like, there are normal broadcasting that displays only moving images on the entire screen, and data broadcasting that displays still images, character graphics, and moving images in combination. Currently, broadcasters broadcast many programs of data broadcasting so that still images and character graphics are mixed and displayed as shown in FIG. 8B. In this case, the reduced moving image is displayed on the small screen.
[0003]
When the normal broadcast reception mode is changed to the data broadcast reception mode in response to a user operation, for example, the display state in FIG. 8A is changed to the display state in FIG. 8B in an instant. In this case, it is difficult to intuitively understand where the moving image has moved, and the movement is boring.
[0004]
Therefore, conventionally, it has been considered that the display position and the reduction rate of a moving image are changed stepwise when the display state of FIG. 8B is obtained from the display state of FIG. 8A.
[0005]
[Problems to be solved by the invention]
By the way, as shown in FIGS. 9A to 9D, a general data broadcast screen is configured by superimposing a still image plane, a moving image plane, and a character graphic plane. The moving image plane is a moving image reduction display screen. The still image plane displays the 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 BML (Broadcast Markup Language) text of data broadcasting. The moving image plane is displayed with the specified display position and size.
[0006]
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 the moving image plane. That is, the moving image plane is stored between the still image plane and the character graphic plane. Therefore, as described above, when the moving image display position and the reduction ratio are changed in stages, there is a problem that the moving image appears to be shrunken under the character figure. . FIG. 11 shows a screen display example at an intermediate stage.
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to provide an image signal processing apparatus and processing method in which image transition on a screen is performed continuously and smoothly without a sense of incongruity.
[0008]
[Means for Solving the Problems]
  An image signal processing apparatus according to the present invention is as follows.Have a predetermined sizeOn the whole screenSame as the predetermined sizeFrom the state where one image is displayed,One image on part of the screenA size smaller than the predetermined sizeIs displayed on the other part of the screen.Same as the predetermined sizeotherCharacter figureImageThe one image and the character graphic portion of the character graphic image are combined without overlapping.An image signal processing device for transitioning to a displayed state, based on an image signal corresponding to one image,Same as the predetermined sizeFrom the whole screenSmaller than a given sizeIn a certain number of reduction stages leading to a portion of the screenReduction of size smaller than a predetermined sizeFirst image signal processing means for sequentially obtaining images, and otherCharacter figureBased on the image signal corresponding to the image,Smaller than a given sizeFrom a part of the screenSame as the predetermined sizeDuring a predetermined number of expansion stages that span the entire screenGenerated by cropping an image smaller than a predetermined size.otherCharacter figureSecond image signal processing means for sequentially obtaining images, and a predetermined number of enlargement stages sequentially obtained by the second image signal processing means.Generated by cropping an image smaller than a predetermined size.otherCharacter figurethe image,Same as the predetermined sizeTo be displayed on the entire screen, To a predetermined sizeIn a predetermined number of reduction stages sequentially obtained by the image enlargement processing means to be enlarged and the first image signal processing meansShrinkImages and,Image enlargement processing meansOther character figures enlarged to a predetermined size byimageWhenTheSecond image signal processing meansIn the expansion stage obtained sequentially inGenerated by cropping an image smaller than a predetermined size.otherCharacter figureimageButTo be displayed on the whole screenIn addition,eachShrinkEvery stageCorresponding sequentially with each expansion stageSynthesizing means for synthesizing and obtaining an output image signal.
[0009]
  An image signal processing method according to the present invention includes:Have a predetermined sizeOn the whole screenSame as the predetermined sizeFrom the state where one image is displayed,One image on part of the screenA size smaller than the predetermined sizeIs displayed on the other part of the screen.Same as the predetermined sizeotherCharacter figureImageThe one image and the character graphic portion of the character graphic image are combined without overlapping.An image signal processing method for transitioning to a displayed state, based on an image signal corresponding to one image,Same as the predetermined sizeFrom the whole screenSmaller than a given sizeIn a certain number of reduction stages leading to a portion of the screenReduction of size smaller than a predetermined sizeThe first step of obtaining images sequentially and the otherCharacter figureBased on the image signal corresponding to the image,Smaller than a given sizeFrom a part of the screenSame as the predetermined sizeDuring a predetermined number of expansion stages that span the entire screenGenerated by cropping an image smaller than a predetermined size.otherCharacter figureA second step of sequentially obtaining images;Second stepThe predetermined number of expansion stages obtained sequentially byGenerated by cropping an image smaller than a predetermined size.otherCharacter figurethe image,Same as the predetermined sizeTo be displayed on the entire screen, To a predetermined sizeA third step of enlargement and a predetermined number of reduction stages sequentially obtained in the first stepShrinkImages and,Third stepTo a given sizeEnlargedOther character shapesimageWhenTheSecond stepIn the expansion stage obtained sequentially inGenerated by cropping an image smaller than a predetermined size.otherCharacter figureimageButTo be displayed on the entire screen,eachShrinkEvery stageCorresponding sequentially with each expansion stageAnd a fourth step of obtaining an output image signal by synthesis.
[0010]
This invention is for transitioning 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. Is. For example, one image is a moving image, and the other image is a still image and a character graphic.
[0011]
The first image signal of each stage is obtained so that the display position and the reduction ratio of one image change in stages. That is, based on the image signal corresponding to one image, a first image signal for displaying one image on a screen portion in a predetermined number of stages from the entire screen to a part of the screen is sequentially obtained.
[0012]
Accordingly, the second image signal at each stage is obtained so that the display range and the enlargement ratio of other images change in stages. That is, based on an image signal corresponding to another image, an image signal of a predetermined number of stages 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. The second image signal to be obtained is sequentially obtained.
[0013]
Then, the output image signal is obtained by synthesizing the predetermined number of first image signals and the predetermined number of second image signals for each step.
[0014]
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 can be intuitively understood where the one image has moved. Also, since the reduction ratio of one image increases step by step, it will be interesting to the eye. In addition, as the display position and the reduction ratio of one image change stepwise, the display range and the enlargement rate of other images also change stepwise. Therefore, not only one image changes on the screen, but all images including other images change as one, so that the image transition on the screen is performed continuously and smoothly without a sense of incongruity. Become.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a configuration of a set top box (STB) 100 for receiving a digital broadcast signal as an embodiment.
[0016]
The set top box 100 includes a CPU (Central Processing Unit), an internal control unit 101 for controlling the entire operation, a control program area for storing a control program for controlling the operation of the CPU, and a CPU And an operation control unit 103 that outputs a control command according to the operation of the user's remote control transmitter or key input unit (not shown).
[0017]
The memory 102 and the operation control unit 103 are connected to the internal control unit 101. In the 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 described later A program or the like for controlling image transition when the reception mode is changed from broadcasting to data broadcasting is stored.
[0018]
The set-top box 100 extracts a digital broadcast signal of a predetermined channel from a plurality of channels of digital broadcast signals received by a receiving antenna (not shown), and performs demodulation processing and error correction processing on the digital broadcast signals. And a tuner 104 that obtains a broadcast data DB. This broadcast data DB is, for example, an MPEG2 (Moving Picture Experts Group 2) transport stream.
[0019]
Further, the set-top box 100 is a demultiplexer that separates video data VD, audio data AD, data DD such as still images and character graphics in data broadcasting, and information signals related to each data from the broadcast data DB obtained by the tuner 104. 105. The information signal separated by the demultiplexer 105 is supplied to the internal control unit 101.
[0020]
Further, 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, and the demultiplexer An audio processing unit 106 that performs data decompression decoding on the audio data AD separated in 105 to obtain an audio signal SA;
[0021]
The set-top box 100 also includes a conversion unit 108 that performs image reduction processing 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. .
[0022]
In this case, when the reception mode changes from normal broadcast to data broadcast, the conversion unit 108 displays an image based on the video signal SV on a predetermined number of stages from the entire screen to the final small screen. Image signal V₁Are output sequentially. Thereafter, the conversion unit 108 performs the final stage image signal V.₁Is output continuously. Note that the conversion unit 108 outputs the video signal SV as it is without performing a reduction process on the video signal SV when receiving the normal broadcast.
[0023]
For example, as shown in FIG.₀~ Q_FourFurther description will be made by taking the case where “” is set as an example. Where Q₀Is the whole screen, Q_FourIs the final small screen. Each screen part has its position p₀~ P_FourAnd the size information in the horizontal and vertical directions. Here, the position information for specifying each screen portion and the size information are collectively referred to as “screen information”.
[0024]
Final small screen Q_FourIs specified in the BML text of the data broadcast. The internal control unit 101 uses this small screen Q_FourScreen information and the entire screen Q known in advance₀The remaining screen portion Q based on the screen information of₁~ Q_ThreeAsk for screen information.
[0025]
The conversion unit 108 performs the following processing at each stage. In the first stage, the entire screen Q₀An image signal V for displaying an image based on the video signal SV₁Is output. In this case, the conversion unit 108 converts the video signal SV itself into the image signal V.₁Output as.
[0026]
In the next stage, the screen part Q₁An image signal V for displaying an image based on the video signal SV₁Is output. In this case, the conversion unit 108 converts the screen portion Q into the video signal SV.₁The image reduction process is performed in accordance with the size of the video signal, and the video signal after the reduction process is converted into the screen portion Q.₁The image signal V at a timing according to the position of₁Output as.
[0027]
In the next stage, the screen part Q₂An image signal V for displaying an image based on the video signal SV₁Is output. In this case, the conversion unit 108 converts the screen portion Q into the video signal SV.₂The image reduction process is performed in accordance with the size of the video signal, and the video signal after the reduction process is converted into the screen portion Q.₂Image signal V at a timing according to the position of₁Output as.
[0028]
In the next stage, the screen part Q_ThreeAn image signal V for displaying an image based on the video signal SV₁Is output. In this case, the conversion unit 108 converts the screen portion Q into the video signal SV._ThreeThe image reduction process is performed in accordance with the size of the video signal, and the video signal after the reduction process is converted into the screen portion Q._ThreeThe image signal V at a timing according to the position of₁Output as.
[0029]
In the final stage, the final small screen Q_FourAn image signal V for displaying an image based on the video signal SV₁Is output. In this case, the conversion unit 108 converts the small screen Q to the video signal SV._FourImage reduction processing is performed in accordance with the size of the video signal, and the video signal after the reduction processing is converted into the small screen Q._FourThe image signal V at a timing according to the position of₁Output as.
[0030]
After that, the conversion unit 108 uses the final small screen Q._FourAn image signal V for displaying an image based on the video signal SV₁Is output continuously. That is, the conversion unit 108 converts the small screen Q into the video signal SV._FourImage reduction processing is performed in accordance with the size of the video signal, and the video signal after the reduction processing is converted into the small screen Q._FourThe image signal V at a timing according to the position of₁Is repeatedly output.
[0031]
Further, the set-top box 100 controls the image signal V for still image display when receiving the data broadcast based on the data DD separated by the demultiplexer 105 under the control of the internal control unit 101.₂And image signal V for character graphic display_ThreeThe data processing unit 109 for generating
[0032]
In this case, when the reception mode changes from normal broadcasting to data broadcasting, the data processing unit 109 uses the image signal V for still image display obtained from the data DD._2PAnd image signal V for character graphic display_3PThen, the image signals of the screen portions in 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 the image based on each cut out image signal is displayed on the whole screen. The image signal V for each stage₂, V_ThreeAre output sequentially. Thereafter, the data processing unit 109 performs the final stage image signal V.₂, V_ThreeIs output continuously.
[0033]
For example, as shown in FIG.₀~ Q_FourFurther description will be made by taking the case where “” is set as an example. This five-stage screen part Q₀~ Q_FourIs similar to that described in FIG.₀Is the whole screen, Q_FourIs a final small screen on which a moving image is displayed.
[0034]
The data processing unit 109 performs the following processing at each stage. In the first stage, the image signal V_2P, V_3PMore final small screen Q_FourThe image signals corresponding to each of the image signals are cut out, and an image based on the cut out image signals is displayed on the entire screen Q.₀The image is enlarged so that the image signal V is displayed.₂, V_ThreeTo obtain this image signal V₂, V_ThreeThe whole screen Q₀Is output at the timing according to the position.
[0035]
In the next stage, the image signal V_2P, V_3PMore screen part Q_ThreeThe image signals corresponding to each of the image signals are cut out, and an image based on the cut out image signals is displayed on the entire screen Q.₀The image is enlarged so that the image signal V is displayed.₂, V_ThreeTo obtain this image signal V₂, V_ThreeThe whole screen Q₀Is output at the timing according to the position.
[0036]
In the next stage, the image signal V_2P, V_3PMore screen part Q₂The image signals corresponding to each of the image signals are cut out, and an image based on the cut out image signals is displayed on the entire screen Q.₀The image is enlarged so that the image signal V is displayed.₂, V_ThreeTo obtain this image signal V₂, V_ThreeThe whole screen Q₀Is output at the timing according to the position.
[0037]
In the next stage, the image signal V_2P, V_3PMore screen part Q₁The image signal corresponding to each of the image signals is cut out, and an image based on each cut out image signal is displayed on the entire screen Q.₀The image is enlarged so that the image signal V is displayed.₂, V_ThreeTo obtain this image signal V₂, V_ThreeThe whole screen Q₀Is output at the timing according to the position.
[0038]
In the last stage, the image signal V_2P, V_3PMore entire screen Q₀The image signal corresponding to each of the image signals is cut out, and the image by the cut out image signals is displayed on the entire screen Q.₀The image signal V₂, V_ThreeTo obtain this image signal V₂, V_ThreeThe whole screen Q₀Is output at a timing according to the position.
[0039]
Thereafter, the data processing unit 109 receives the image signal V_2P, V_3PMore entire screen Q₀The image signal corresponding to each of the image signals is cut out, and the image by the cut out image signals is displayed on the entire screen Q.₀The image signal V₂, V_ThreeTo obtain this image signal V₂, V_ThreeThe whole screen Q₀It outputs repeatedly at the timing according to the position.
[0040]
Here, the still image plane (image signal V_2P) And character graphic plane (V_3P) Will be described in more detail.
For example, as shown in FIG. 4, the horizontal size of the screen portion that displays the moving image is W₀To W_N-1It is assumed that it changes continuously in N steps up to. At this time, the horizontal size of the cut-out portion in the still image plane and the character graphic plane is set as w as shown in FIG.₀To w_N-1It is continuously changed in N steps. The horizontal size of the screen part that displays the moving image is W_nThe horizontal size of the cut-out part in the still image plane and the character graphic plane when_nAnd
[0041]
Also, as shown in FIG. 4, the x coordinate (horizontal position) of the screen portion displaying the moving image is from 0 to X_N-1Are converted continuously in N steps until the x coordinate of the cut-out portion in the still image plane and the character graphic plane is x₀From 0 to 0 in N steps. The x coordinate of the screen part that displays the moving image is X_nThe x coordinate of the cutout part in the still image plane and the character graphic plane when x_nAnd
[0042]
First, for the sake of 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. At this time, regarding the horizontal size,
W_n: W₀= W₀: W_n
w_n= W₀× W₀/ W_n
So,
w_n= W_N-1× W₀/ W_n              ... (1)
It becomes.
[0043]
As for the x-coordinate (horizontal position)
X_n: W_n= (X₀-X_n): W₀
x_n= X₀-W₀× X_n/ W_n
So,
x_n= X_N-1-W_N-1× X_n/ W_n       ... (2)
It becomes.
[0044]
Furthermore, 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 equations (1) and (2) are expressed by the following equations (3) and (4), respectively. become.
Actually, moving picture plane data is sent as, for example, 1920 × 1080 dot data, while still picture plane and character / graphic plane data is sent as 960 × 540 dot data.
w_n= (W_N-1× W₀/ W_n) × w_N-1/ W₀              ... (3)
x_n= (X_N-1-W_N-1× X_n/ W_n) × w_N-1/ W₀       ... (4)
[0045]
In this way, the horizontal size of the screen portion displaying the moving image is W_n, Its x coordinate is X_n, The horizontal size w of the cut-out portion of the still image plane and the character graphic plane_n, Its x coordinate x_nAre determined by equations (3) and (4), respectively.
[0046]
Although not described in detail, the vertical size of the cut-out portions of the still image plane and the character / graphic plane and the y coordinate (vertical position) are also determined by the same calculation formula.
[0047]
Returning to FIG. 1, the set-top box 100 displays the image signal V for displaying the moving image output from the conversion unit 108.₁And an image signal V for displaying a still image output from the data processing unit 109.₂And an image signal V for displaying a character figure_ThreeAre combined.
[0048]
When receiving the data broadcast, the image signal V from the data processing unit 109 is received.₂, V_ThreeIs output, the synthesizer 110 outputs the still image plane (image signal V₂), Video plane (image signal V₁), Character graphic plane (image signal V_Three) In this order (see FIG. 10), and a synthesized image signal is output. When receiving a normal broadcast, the image signal V from the data processing unit 109 is received.₂, V_ThreeIs not output, the synthesis unit 110 outputs the image signal V output from the conversion unit 108.₁(Video signal SV) is output as it is.
[0049]
The image signal output from the combining unit 110 is supplied to a monitor device 120 serving 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.
[0050]
Next, the operation of the set top box 100 shown in FIG. 1 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, further performs demodulation processing and error correction processing on the digital broadcast signal, and generates a broadcast data DB. can get.
[0051]
Broadcast data DB output from the tuner 104 is supplied to the demultiplexer 105. In the demultiplexer 105, video data VD, audio data AD, data DD such as still images and character graphics in data broadcasting, and information signals related to the respective data are separated from the broadcast data DB. The information signal separated by the demultiplexer 105 is supplied to the internal control unit 101.
[0052]
The audio data AD, video data VD, and data DD separated by the demultiplexer 105 are supplied to the audio processing unit 106, the video processing unit 107, and the data processing unit 109, respectively.
[0053]
In the audio processing unit 106, the audio data AD is subjected to decompression decoding processing to generate an audio signal SA. In the video processing unit 107, the video data VD is subjected to decompression decoding processing to generate a video signal SV.
[0054]
When receiving the normal broadcast, the video signal SV output from the video processing unit 107 is output as it is from the synthesis unit 110 via the conversion unit 108. The video signal SV is supplied to the external monitor device 120.
[0055]
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. The audio signal SA generated by the audio processing unit 108 is supplied to the speaker 130. From the speaker 130, the sound related to the broadcast data DB output from the tuner 104 is output.
[0056]
Next, an operation when an instruction to change the reception mode from the normal broadcast to the data broadcast is given by an input operation by the user's remote control transmitter or a key input unit (not shown) will be described.
[0057]
When the reception mode changes from normal broadcasting to data broadcasting, the conversion unit 108 displays an image signal V 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.₁Are output sequentially. Thereafter, the conversion unit 108 performs the final stage image signal V.₁Is output continuously.
[0058]
In addition, the data processing unit 109 receives the image signal V for still image display based on the data DD when receiving the data broadcast.₂And image signal V for character graphic display_ThreeIs generated and output. When the reception mode changes from normal broadcasting to data broadcasting, the data processing unit 109 receives the image signal V for still image display obtained from the data DD._2PAnd image signal V for character graphic display_3PThus, image signals of a predetermined number of screen portions 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 the cut out image signal is displayed on the entire screen. Stage image signal V₂, V_ThreeAre output sequentially. Thereafter, the data processing unit 109 performs the final stage image signal V.₂, V_ThreeIs output continuously.
[0059]
An image signal V for displaying a moving image output from the converter 108.₁Is supplied to the synthesis unit 110. The synthesizing unit 110 further includes an image signal V for displaying a still image output from the data processing unit 109.₂And an image signal V for displaying a character figure_ThreeIs supplied. In the combining unit 110, a still image plane (image signal V₂), Video plane (image signal V₁), Character graphic plane (image signal V_Three) In order, and a combined image signal is generated. The image signal output from the combining unit 110 is supplied to the external monitor device 120.
[0060]
Thereby, 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 broadcasting to data broadcasting, the screen portion on which the moving image is displayed is reduced from the entire screen in order to become the final small screen. The cut-out position and the enlargement ratio also change. After that, the state where the moving image is displayed on the final small screen continues.
[0061]
6A to 6D show examples of image transition when the reception mode changes from normal broadcasting to data broadcasting. 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 portions on which the moving images are displayed are sequentially reduced. Along with this, the enlargement ratio of still images and character figures is reduced, and the display range is increased. At the final stage, as shown in FIG. 6E, the moving image is displayed on the final small screen, and the entire range of still images and character figures is displayed.
[0062]
The flowchart of FIG. 7 shows an example of a control operation related to image signal processing by the internal control unit 101 when the reception mode changes from normal broadcasting to data broadcasting. In this example, the screen part Q of 5 levels₀~ Q_FourIs assumed (see FIGS. 2 and 3).
[0063]
When the reception mode is changed from normal broadcasting to data broadcasting, the small screen Q is selected in step ST1._FourScreen information (size information and position information) and the entire screen Q known in advance₀The remaining screen portion Q based on the screen information of₁~ Q_ThreeAsk for screen information. And each screen part Q₀~ Q_FourAre stored in the memory 102 as A (0) to A (4). Note that the operation of step ST1 may be performed in advance at the time of receiving the normal broadcast.
[0064]
Next, the count value N of the counter is reset to 0 in step ST2. In step ST3, based on A (N), the conversion unit 108 performs image reduction processing, and the image signal V₁Is output. At the same time, based on A (N), a cut-out portion of a still image and a plane of a character figure is obtained, and the data processing unit 109 performs a cut-out process and an image enlargement process to obtain an image signal V₂, V_ThreeIs output. Then, each image signal V is sent to the synthesis unit 110.₁~ V_ThreeAre superimposed and output.
[0065]
Next, in step ST4, the count value N is incremented. In step ST5, it is determined whether N ≧ 5. When N ≧ 5, since the process up to the final stage has already been completed, the process ends. On the other hand, when N ≧ 5, the process returns to step ST3 so that the process based on the next A (N) is performed.
Note that the flowchart of FIG.₀~ Q_FourThe control operation is the same when the number of stages is other than the above.
[0066]
As described above, according to the present embodiment, when the reception mode is changed from the normal broadcast to the data broadcast, the moving image display position and the reduction rate change stepwise, and the moving image is displayed on the entire screen. It moves from the state where is displayed to the state where the moving image is displayed on the final small screen. Therefore, it is possible to intuitively understand where the moving image has moved. In addition, since the reduction ratio of the image increases step by step, it will be interesting.
[0067]
In addition, according to the present embodiment, when there is an operation for changing the reception mode from normal broadcasting to data broadcasting, a still image, text, and the like are displayed as the moving image display position and the reduction ratio change stepwise. The enlargement ratio of the figure becomes smaller and the display range becomes wider. For this reason, not only moving images but also all images including still images and character graphics change in an integrated manner, so that image transition on the screen is performed continuously and smoothly without a sense of incongruity.
[0068]
In the above embodiment, when the reception mode is changed from the normal broadcast to the data broadcast, the display state is changed to display the moving image on the small screen in order to display the still image and the character graphic. Although the present invention is applied to what is to be displayed, the present invention is applied when the display state is similarly changed so that a moving image is displayed on a small screen in order to display some image together with the moving image. Therefore, it is suitable. Further, the image moving from the entire screen display to the small screen display is not limited to a moving image, and may be a still image or a character graphic.
[0069]
In the above-described embodiment, when the reception mode is changed from normal broadcasting to data broadcasting, the position of each display portion of the moving image moves linearly. For example, P in FIG.₀~ P_FourExist on the same straight line. The position of each display portion of the moving image can be configured to move on a predetermined curve. Thereby, the visual effect can be further enhanced.
[0070]
In the above-described embodiment, the image reduction processing for moving images, the clipping processing for still images and character graphics, the image enlargement processing, and the processing for superimposing the moving image plane, the still image plane, and the character graphics plane are performed by hardware. As described above, these processes can naturally be performed by software.
[0071]
【The invention's effect】
According to the present invention, a transition is made 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. In this case, the display position and reduction ratio of one image are changed step by step, and the display range and enlargement ratio of other images are changed step by step. Transition is performed continuously and smoothly without a sense of incongruity.
[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 for a moving image;
FIG. 3 is a diagram for explaining image cut-out processing and image enlargement processing for still images and character graphics.
FIG. 4 is a diagram illustrating a change in a screen portion that displays a moving image.
FIG. 5 is a diagram illustrating 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 the reception mode is changed from normal broadcasting to data broadcasting.
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 showing an example of a screen change when the reception mode is changed from normal broadcasting to data broadcasting.
FIG. 9 is a diagram for explaining a general data broadcast screen;
FIG. 10 is a diagram for explaining a superposition of each of a still image plane, a moving image plane, and a character graphic plane.
FIG. 11 is a diagram illustrating a screen display example in the middle of the prior art when the reception mode is changed to data broadcasting.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 100 ... Set top box, 101 ... Internal control part, 102 ... Memory, 103 ... Operation control part, 104 ... Tuner, 105 ... Demultiplexer, 106 ... Audio processing part , 107 ... Video processing unit, 108 ... Conversion unit, 109 ... Data processing unit, 110 ... Composition unit, 120 ... Monitor device, 130 ... Speaker

Claims (3)

From a state in which the same image as the predetermined size is displayed on the entire screen having the predetermined size , the reduced image having the size smaller than the predetermined size is displayed on a part of the screen. And another character graphic image having the same size as that of the predetermined size is displayed on the other part of the screen without being overlapped with the one image and the character graphic part of the character graphic image. An image signal processing device for making a transition to
Based on an image signal corresponding to the one image, the predetermined size is smaller than the predetermined size in a predetermined number of reduction stages ranging from the same screen as the predetermined size to a part of the screen having a size smaller than the predetermined size. First image signal processing means for sequentially obtaining reduced images of size ;
On the basis of image signals corresponding to the other graphic character image, said predetermined by have you from a portion of the screen of smaller size than the predetermined size to large stage of the predetermined number to reach the entire said predetermined size the same as the screen Second image signal processing means for sequentially obtaining the other character graphic images generated by cutting out an image having a size smaller than
The other graphic character image generated by cutting an image of a size smaller than the sequence obtained above a predetermined size have your expansion stage of the predetermined number by the second image signal processing unit, the predetermined size Image enlargement processing means for enlarging the image to the predetermined size so as to be displayed on the same entire screen,
The reduced image in the predetermined number of reduction stages sequentially obtained by the first image signal processing means and the other character graphic image enlarged to the predetermined size by the image enlargement processing means as it said other graphic character image generated by cutting an image of smaller size than Oite the predetermined size to large steps sequentially obtained by the image signal processing unit is displayed on the entire screen above, each reduction An image signal processing apparatus comprising: synthesis means for obtaining an output image signal by sequentially corresponding to each enlargement step and synthesizing for each step . The one image is a moving image in a program, and the other image is a still image or a character figure,
The image signal processing apparatus according to claim 1, further comprising: an output unit that outputs the output image signal synthesized by the synthesizing unit at a timing according to a position on the screen. From a state in which the same image as the predetermined size is displayed on the entire screen having the predetermined size , the reduced image having the size smaller than the predetermined size is displayed on a part of the screen. And another character graphic image having the same size as that of the predetermined size is displayed on the other part of the screen without being overlapped with the one image and the character graphic part of the character graphic image. An image signal processing method for making a transition to
Based on an image signal corresponding to the one image, the predetermined size is smaller than the predetermined size in a predetermined number of reduction stages ranging from the same screen as the predetermined size to a part of the screen having a size smaller than the predetermined size. A first step of sequentially obtaining reduced images of size ;
On the basis of image signals corresponding to the other graphic character image, said predetermined by have you from a portion of the screen of smaller size than the predetermined size to large stage of the predetermined number to reach the entire said predetermined size the same as the screen A second step of sequentially obtaining the other character graphic images generated by cutting out an image having a size smaller than
The other graphic character image generated by cutting an image of smaller size than the predetermined size has it sequentially obtained expansion stage of the predetermined number by the second step, the same as that of the predetermined size A third step of enlarging to the predetermined size so as to be displayed on the entire screen;
The upper Symbol reduced image in turn resulting reduction step of a predetermined number in the first step, and the third other graphic character image is enlarged to the predetermined size by the steps, in the second step as it said other graphic character image generated by cutting an image of smaller size than you have in the predetermined size to large steps sequentially obtained is displayed on the entire screen above, each at the each reduction stage And a fourth step of sequentially obtaining and synthesizing an output image signal corresponding to the enlargement stage .

Images