JPH05268543A - Picture-in-picture system - Google Patents

Abstract

PURPOSE:To display video information of a master pattern when a prescribed motion is in existence in the master pattern of an area of a slave pattern even when the slave pattern is displayed. CONSTITUTION:The system is provided with a motion detection circuit 9 detecting a motion by comparing a signal of a master pattern with a preceding signal, a peak position detection circuit 10 specifying an area with much motion and an area with less motion based on a difference signal phi outputted from the motion detection circuit 9, and with a control microcomputer 11 eliminating the slave pattern or moving the slave pattern to an area with less motion when the slave pattern is in existence in an area with much motion specified by the peak position detection circuit 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a picture-in-picture system for realizing digital video special effects.

[0002]

2. Description of the Related Art FIG. 6 is a block diagram of a picture-in-picture system disclosed in, for example, September 1989, Transistor Technology (published by CQ Publisher). In FIG. 6, 1 is an encoder, 1a is a parent-child reversing switch, 1
b is a sync separation block, 1c is a PLL block, 1d is an encoder block, 2 is a decoder, 3 is a sync separation circuit, 4 is an AD converter, 4a is a clamp circuit, and 4b.
Is a multiplexer, 4c is an AD converter block,
5 is a D-A converter, 6 is a field memory, 7 is a controller, 8 is a picture-in-picture (hereinafter, P
IP) switch.

Next, the operation will be described. In FIG. 6, two systems of composite signals are input to the encoder unit 1, and one is a parent screen (through image) and the other is a child screen (memory image) by the internal parent-child reversing switch 1a.
The reduced child screen is inserted into the signal of the parent screen via the PIP switch 8. The PIP switch 8 is also controlled by the encoder 1. The parent screen signal is input to the sync separation block 1b, whereby the vertical sync signal VD, the composite sync signal C. The horizontal synchronizing signal HD subjected to SYNC and AFC is output respectively. H isolated
D, VD, C.I. Each sync signal of SYNC is input to the controller 7, respectively, and the controller 7 generates timing for reading from the field memory 6 by these signals. On the other hand, the video signal selected on the child screen by the parent-child inverting switch 1a is also output from the encoder 1, passes through the BPF (bandpass filter) to become only the color signal component, and is input to the decoder 2.
The color signal that has passed through the first amplification and the second amplification is BY demodulated, R-
Y demodulation is performed and the color difference signals BY and RY are input to the AD converter 4, respectively. At the same time, the video signal selected for the child screen is input to the sync separation circuit 3 and HD and VD are output by the vertical sync separation circuit and the horizontal sync separation circuit (not shown). SYNC is also output. These HD, VD and C.I. The SYNC is input to the controller 7. The controller 7 performs timing generation at the time of writing the memory to the field memory 6 by these synchronization signals. The luminance signal component output from the encoder 1 and passed through the LPF is input to the AD converter 4. That is, the luminance signal passing through the LPF and the color difference signal output from the decoder 2 are both input to the AD converter 4. Y, RY, BY
The analog signal of
The signal is clamped to the pedestal level, and the RY and BY signals are clamped to the center level. After that, Y, R-Y, Y, B- by the internal multiplexer 4b.
It is multiplexed like Y, Y .... The control of the multiplexer 4b is executed by sending a control signal from the controller 7 to the AD converter 4. The multiplexed analog Y, RY and BY signals are A-
The data is converted into digital data by the D converter block 4c and output from the AD converter 4. A-
The digital data output from the D converter 4 is input to the field memory 6. In this system, it is assumed that the field memory 6 stores the video for one field. Next, the digital data read from the field memory 6 is input to the DA converter 5. The Y, RY, and BY signals of the child screen converted into analog data by the DA converter 5 are input again to the encoder 1, and the color difference signals RY and BY are chroma signals in the encoder block 1d. Is modulated to. Further, the video signal is added with the luminance signal and the synchronizing signal is added to form a video composite signal. After that, it is inserted into the main screen by the PIP switch 8 and output as the final PIP video signal. The controller 7 inserts the image of the child screen into the parent screen by the means described below. That is, the image data (Y, RY, BY signals) of the small screen image is taken into the field memory 6 in synchronization with the horizontal, vertical and composite signals of the small screen image. The image data (Y, RY, BY signals) of the child screen in the field memory 6 is taken out in synchronization with the horizontal, vertical and composite synchronizing signals of the parent screen image.
To reduce the size of the sub screen, for example, change the size of the sub screen to 1 / the size of the main screen.
In the case of the size of 9, the readout display is performed in the horizontal direction at a rate three times as high as the rate of capturing the image in the field memory 6. In the vertical direction, when writing to the field memory 6, one line is taken in every three horizontal lines and one line is continuously displayed in the display time character.

[0004]

Since the conventional PIP system is configured as described above, when the image of the child screen is displayed, the image of the parent screen becomes invisible in that part, and important information of the parent screen is displayed. For example, in movie software, there is a problem that a moving part cannot be seen because it is hidden in the small screen.

The present invention has been made in order to solve the above problems, and when a child screen is output,
To provide a PIP system that does not overlook the moving picture information of the parent screen by moving the child screen from the location when there is a certain amount of movement in the picture information of the parent screen of that portion. With the goal.

[0006]

SUMMARY OF THE INVENTION A PIP system according to the present invention comprises a motion detection circuit for outputting a difference signal indicating a motion by comparing a signal of a parent screen with a signal before this signal, and a parent signal from this difference signal. A peak position detection circuit that identifies areas with a lot of movement in the screen, and when the child screen exists in an area with a lot of movement detected by the peak position detection circuit, the child screen is erased or moved to an area with little movement. It is equipped with a control microcomputer.

[0007]

In the PIP system according to the present invention, when the child screen is displayed and the parent screen in the area moves, the difference signal output from the motion detection circuit becomes large,
When this is detected by the peak position detection circuit and specified as an area with a large amount of movement, the control microcomputer erases the child screen or moves it to an area with a small amount of movement specified by the peak position detection circuit.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of the PIP system of the present invention. In FIG. 1, the same symbols as those in FIG. 6 indicate the same components, 9 is a motion detection circuit, 10 is a peak position detection circuit, and 11 is a control microcomputer. Although the configuration for displaying the sub-screen is the same as that shown in FIG. 6 described in the related art, the present invention further includes a field memory (shown in FIG. 2) for storing one field screen as means for detecting movement of the main screen. For example, when the screen is divided into two parts vertically and horizontally, it is detected which part has the most movement, and when the child screen exists in that part, the child screen is moved to the part having the least movement of the parent screen. A means for controlling the controller 7 by the control microcomputer 11 is provided.

Next, the operation will be described. The configuration for displaying the inset screen is the same as the conventional one, and the operation is exactly the same. However, in the present invention, the motion detection circuit 9 having the configuration shown in FIG. 2 is added. The motion detection circuit 9 inputs the video signal connected to the parent signal to the A / D converter 9a, and subtracts the video data of the previous field previously input and accumulated in the field memory 9b from the subtraction of the next field. It is performed by the device 9c and outputs the difference signal φ. As a result, a difference signal φ is output for each horizontal scanning line of the parent signal (hereinafter, referred to as 1H), which is shown in FIG.
Shown in. Now, when the screen is divided into two in the horizontal direction, it can be seen that the peak 10a of the left difference signal φ is larger than 10b, and the left screen has larger motion.

In the present embodiment, the area where the difference signal φ is the largest is displayed on the screen S (1) to S (S) as shown in FIG. 4, for example.
(4) The peak position detection circuit 10 is configured to determine which of the four divisions has the largest difference signal φ and which has the smallest difference signal φ. Specifically, the peak position of the difference signal φ is detected, and if the difference signal φ is max at the portion corresponding to S (1), only S (1) is at the “H” level and the difference signal φ is S (2). ) In the part corresponding to
If it is in, the circuit configuration is such that S (2) becomes "L" level. The rest is Hi-z.

The controller 7 is provided with a switch so that the controller 7 can select any of S (1) to S (4) shown in FIG. It is selected by the receiving control microcomputer 11. That is, the position of the child screen selected by the control microcomputer 11 and the maximum of the difference signal φ detected by the peak position detection circuit 10.
If the positions of the screens of, for example, coincide with each other in S (1), the control microcomputer 11 determines the positions of the small screens when the difference signal φ is min.
The controller 7 is controlled so as to move to S (2). Alternatively, instead of moving to S (2), the sub-screen is erased, or to move to S (2), a timer circuit or the like moves the screen to S (2) for a certain period of time to display the sub-screen. It is also possible to control the controller 7 so that the movement of is not bothered. Needless to say, the operation mode of moving the small screen as in the present invention can be turned ON / OFF.

[0012]

As described above, according to the present invention, a motion detection circuit for outputting a difference signal indicating a motion by comparing a signal of the parent screen with a signal before this signal, and a motion detection circuit from the difference signal within the parent screen. The peak position detection circuit that identifies the areas with a lot of movement and the area with a small movement, and the control that erases the child screen or moves it to an area with little movement when the child screen exists in the area with a lot of movement detected by the peak position detection circuit. Since it is equipped with a microcomputer, in the PIP system, when there is movement in the parent screen when outputting the child screen, the child screen is deleted or the child screen is moved from that area to a non-moving area of the parent screen. As a result, it is possible to avoid overlooking important information with movement on the main screen.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a PIP system of the present invention.

FIG. 2 is a block diagram of a motion detection circuit used in the present invention.

FIG. 3 is a diagram showing an example of a difference signal φ.

FIG. 4 is a diagram for explaining the operation of the present invention.

FIG. 5 is a block diagram showing a peak position detection circuit.

FIG. 6 is a block diagram showing a conventional PIP system.

[Explanation of symbols]

 1 Encoder 2 Decoder 3 Sync Separation Circuit 4 AD Converter 5 DA Converter 6 Field Memory 7 Controller 8 PIP Switch 9 Motion Detection Circuit 10 Peak Position Detection Circuit 11 Control Microcomputer

Claims (1)

[Claims] 1. In a picture-in-picture system for displaying a child screen of an arbitrary size in an arbitrary area of the parent screen, a difference signal indicating motion by comparing a signal of the parent screen with a signal before this signal. A motion detection circuit that outputs a peak position detection circuit that specifies an area with a lot of movement and a small area in the parent screen from the difference signal, and a child screen with an area with a lot of movement detected by the peak position detection circuit. A picture-in-picture system, characterized in that it has a control microcomputer that erases the sub-screen when it exists or moves it to an area with little movement.