JPH05347733A - Method and device for pip image processing - Google Patents

Abstract

PURPOSE:To display the images at the correct positions on a slave screen in a stable state and with no disturbance when a master screen includes the snow noises having no synchronizing signal. CONSTITUTION:A video signal detecting part 3 is provided to detect whether the inputted master screen video signal 1 includes a regular synchronizing signal or not together with a video signal switching part 4 which performs the switching between the signal 1 and a slave screen video signal 2 based on the detecting result of the part 3, a synchronizing separator part 5 which separates the synchronizing signal from the output of the part 4, and a master screen synthesizing part 8 which synthesizes both signals 1 and 2 together based on the separated synchronizing signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a television receiver,
PIP (Pictu) applicable to video equipment such as VTR
The present invention relates to a re In Picture) image processing method and apparatus.

[0002]

2. Description of the Related Art Conventionally, a PIP image processing method and apparatus thereof have a position where a child screen is displayed based on a synchronization signal included in a parent screen video signal, that is, a position of a video signal of a child screen which is superimposed on the video signal of the parent screen. Was decided.

[0003]

In the conventional PIP image processing method and apparatus, the television image is received when the video signal of the main screen which is the reference of the display position of the small screen is the noise which does not include the normal synchronizing signal. In the machine, the display of the sub-screen is disturbed and slightly moved left and right and up and down, and in the video signal output in the VTR, the sub-screen video signal is not output. Also, when the main screen video signal of the television receiver is a complete signal without noise, the synchronous deflection circuit in the receiver oscillates at the free-run frequency, so the sub screen shifts from the normal display position. There was also the drawback that it would end up.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a PIP image processing method and apparatus capable of correctly displaying a child screen without being affected by the state and presence / absence of a sync signal of a parent screen video signal.

[0005]

Therefore, in order to achieve the above-mentioned object, the first aspect of the present invention is to input a main screen video signal and a sub screen video signal to display a sub screen on a part of the main screen. In the PIP image processing method described above, when the parent screen video signal includes a regular sync signal, the parent screen video signal and the child screen video signal are combined and output based on the sync signal of the parent screen video signal. When the parent screen image signal does not include a normal synchronizing signal, the parent screen image signal and the child screen image signal are combined and output based on the synchronizing signal of the child screen image signal.

A second aspect of the present invention is a PIP image processing apparatus for inputting a parent screen video signal and a child screen video signal to display a child screen on a part of the parent screen, in which a synchronizing signal of the parent screen video signal is supplied. A video signal detection unit that detects and outputs a control signal, and a video signal switching unit that switches and outputs the parent screen video signal and the child screen video signal based on the control signal.
A sync separation unit that separates and outputs a sync signal from the output of the video signal switching unit, and a parent-child screen synthesizing unit that synthesizes a child screen video signal with a part of the parent screen video signal based on the synchronization signal It is a thing.

[0007]

According to the present invention, the video signal detection unit detects the presence or absence of the sync signal of the parent screen video signal, and the video signal input to the sync separation unit is automatically switched to the parent screen video signal or the child screen video signal. It solves the problem that the display of the child screen is disturbed by the effect of the parent screen video signal that does not include a normal sync signal.

[0008]

Embodiments of the present invention will now be described with reference to FIGS.

FIG. 1 shows an embodiment in which the PIP image processing apparatus of the present invention is applied to a television receiver, and a parent screen image signal 1 and a child screen image signal 2 are input. The main screen video signal 1 is input to the video signal detection unit 3 and it is determined whether or not the input signal includes a regular synchronization signal.

Therefore, the video signal detecting section 3 may be provided with a circuit for generating a control voltage for discrimination by integrating the synchronous signal separated by the synchronous separating circuit.

The control signal sent from the video signal detector 3 switches between the parent screen video signal 1 and the child screen video signal 2 input to the video signal switching unit 4 and outputs the switched signal to the synchronization separating unit 5 in the subsequent stage. Work to do. First, if the master screen video signal 1 is a video signal including a regular synchronization signal, the video signal detection unit 3 switches the video signal switching unit 4 to the master screen video signal 1,
The entire device is synchronized by moving the deflection circuit based on the synchronization signal of the main screen. Further, the display position of the child screen is also based on the sync signal of the parent screen.

The composition of the parent screen image signal 1 and the child screen image signal 2 is processed by the parent and child screen composition section 8. This part is Y
A / C separation, memory, A / D conversion, D / A conversion, etc. are included. The sync signal for determining the display position of the child screen may be input from the sync separation unit 5 to the parent-child screen composite unit 8.

Next, when the parent screen video signal 1 is a noise after the end of the television broadcasting or is in a completely non-signal state after the end of the video reproduction, the video signal detecting section 3 does not include a synchronizing signal. This is detected and a control signal is generated to switch the video signal switching unit 4 to the sub-screen video signal 2. By the control signal, the video signal switching unit 4 causes the sub-screen video signal 2
The synchronization signal of the child screen is used as a reference for the synchronization of the entire apparatus, and the deflection circuit and the display section are activated. Therefore, even when the normal parent screen video signal 1 is not input, the child screen is always displayed in a stable position at the determined position. At this time, since the main screen is a screen with no noise or no signal, only the main screen may be subjected to a video mute.

The composite video signal output from the parent-child screen composition section 8 is the RG used in the conventional PIP image processing apparatus.
A B signal or a composite signal may be used, but when the parent screen video signal does not include a sync signal, the sync signal portion of the child screen video signal 2 input to the parent-child screen composite section 8 is used as the sync signal of the composite video signal. Thus, it is necessary to provide a processing circuit in the parent-child screen synthesizing unit.

FIG. 2 shows a VT of the PIP image processing apparatus of the present invention.
In the embodiment applied to R, the configuration is the same as that of the television receiver of FIG. 1 except that the deflection unit is not provided.

[0016]

As described above, according to the present invention, the parent screen image signal for determining the child screen display position in the PIP image processing method and apparatus is automatically converted into the child screen image signal by detecting the presence or absence of the synchronizing signal. Switching, conventional PI
The problem of the P image processing method and its apparatus is to eliminate the disturbance of the sub-screen when the main-screen video signal is noise and the displacement of the sub-screen when the main-screen video signal is completely unsignaled. Even in such a state of the parent screen video signal, the sub screen is stably displayed at the regular display position.

[Brief description of drawings]

FIG. 1 is a block diagram in which a PIP image processing device of the present invention is applied to a television receiver.

FIG. 2 is a block diagram in which the PIP image processing device of the present invention is applied to a VTR.

[Explanation of symbols]

 1 parent screen video signal 2 child screen video signal 3 video signal detection unit 4 video signal switching unit 5 sync separation unit 6 horizontal deflection unit 7 vertical deflection unit 8 parent and child screen composition unit

Claims (2)

[Claims] 1. A PIP image processing method for inputting a main screen video signal and a sub screen video signal to display a sub screen on a part of the main screen, wherein the main screen video signal includes a regular synchronization signal. When the master screen video signal and the slave screen video signal are combined and output based on the sync signal of the master screen video signal and the master screen video signal does not include a regular sync signal, the slave screen is displayed. A PIP image processing method characterized in that the parent screen image signal and the child screen image signal are combined and output based on a synchronizing signal of the image signal. 2. A PIP image processing apparatus for inputting a main screen video signal and a sub screen video signal to display a sub screen on a part of the main screen, wherein a control signal is detected by detecting a synchronization signal of the main screen video signal. , A video signal switching section for switching and outputting the main screen video signal and the sub screen video signal based on the control signal, and a synchronizing signal separated from the output of the video signal switching section. A PIP image processing apparatus, comprising: a sync separation unit that outputs the parent screen image signal based on the sync signal; and a parent-child screen composition unit that combines the child screen image signal with a part of the parent screen image signal.