JPH04109292A - Image processor - Google Patents

Abstract

PURPOSE:To display relative display positions of plural images with simple constitution by setting a movement quantity after detecting the vertical synchronizing signal of a reference image first, and performing set movement after detecting the vertical synchronizing signal next. CONSTITUTION:The video signal of a video disk player 11 is supplied to a switch circuit 13 through a double-speed scanning converter circuit 14 and the output of this switch circuit 13 is supplied to an image receiver 15. Further, a gain lock circuit 16 and a system control circuit 20. When the display position of one image is moved on the basis of the display position of the other image, the movement quantity of the former image is set after the vertical synchronizing signal of the latter image is detected first and then the set movement is carried out after the vertical synchronizing signal following the 1st detected vertical synchronizing signal is detected. Consequently, the vertical synchronizing signals of plural kinds of image are prevented from becoming out of phase with the simple constitution which does not increase in cost and the images can be stabilized even when the relative display positions are changed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image processing device suitable for displaying a plurality of types of so-called multimedia images.

[Summary of the Invention] The present invention provides an image processing device that superimposes and displays multiple types of multimedia images. In addition to setting the amount of movement after detecting the
By executing the set movement after detecting the next vertical synchronization signal, the image can be stabilized even if the relative display positions of multiple types of images are changed, with a simple configuration and while avoiding increased costs. It was made to look like this.

[Prior Art] Conventionally, a reproduced image (video image) of a normal video medium, such as a video disc, and an image (video image) of a different medium, which is electronically formed using computer graphics, have been used.
A so-called multimedia image processing device that supports both images and superimposes both images on a display is used for education, product explanation,
It is widely used for maintenance parts management, etc.

For example, IBM
VGA (Video Graphics) by
Array) method and MIC (Multi Media Interact) mainly used in Europe.
There are ive control methods, etc.

In the case of superimposed display, as is well known, a so-called genlock technique is used in which the phases of synchronization signals of both video signals are matched (see, for example, Japanese Patent Laid-Open No. 2149184 by the present applicant). ).

[Problems to be Solved by the Invention] By the way, in the multimedia image processing device as described above, when a CG image is superimposed on a video image and displayed, scanning is difficult as shown in FIGS. 4A and B. Number of lines (
The unit of video image (horizontal period on the time axis) is
) and the CG image (2) can be displayed relative to each other.

As shown in FIG. 5, the displayable period (display area) (3) of the CG image has a horizontal period Htot in both the horizontal and vertical directions.
It is quite small compared to al and vertical period Vtotal,
For example, in the MIC system, the total number of scanning lines in the standard television system is 625, but the display area (3) is 4.
This corresponds to 00 scanning lines.

Then, the control device appropriately sets the display parameters ① blank start and V retrace start, and displays the display area (3
) and the border (4t) of the next field are determined.
The widths of the top (1t) and bottom (1b) of the video image (1) displayed above and below the G image (2) are determined.

However, when an image processing device compatible with the conventional VGA method emulates the MIC method, the video image (
When the display position of CG image (2) is changed with respect to 1), the phases of the vertical synchronization signals of the video image and the CG image will shift by more than one horizontal scanning period, and the vertical amplitude of both images will suddenly change for several seconds, for example. The problem was that it was decreasing.

This is due to the following reasons.

In conventional image processing devices, C for video image (1)
When changing the display position of the G image (2), as shown in FIG. 6, detect the vertical retrace period (V, Ret), wait for this to end (step 5LS2), and then move the arrow t in FIG.
At the timing shown in 1, ■ blank start point and V
The display parameters of the retrace start point were changed at the same time (
Step S3).

As a result, as shown in FIG. 7B, from the current field including time t1, the width of the border (4b) immediately after the display area (3) of the CG image becomes narrower, and the width of the border (4t) of the subsequent field becomes narrower. 5 becomes wider (see FIG. 5), the phase of the vertical synchronizing signal of the CG image advances, and a phase shift of Δφ occurs between the vertical synchronizing signal of the video image shown in FIG.

In image processing devices compatible with the MIC method, the clock supply to the control device is stopped for a certain period of time in order to solve the problem of phase shift, but this requires a considerable amount of video RAM, etc., and the circuit size is large. , there were problems such as increased costs.

In view of this, an object of the present invention is to provide an image that has a simple configuration, avoids an increase in cost, and maintains stability even when the relative display positions of multiple types of superimposed images are changed. The company provides processing equipment.

[Means for Solving the Problems] The present invention provides an image processing device that displays a plurality of types of images, each having a predetermined display width, on the same display device. When moving the display position of an image, first detect the vertical synchronization signal of one image, then set the amount of movement of the other image, and after detecting the vertical synchronization signal next to the vertical synchronization signal detected first. This is an image processing device that executes the movement set in .

[Effect 1] According to the present invention, with a simple configuration that does not involve an increase in cost, phase shifts in vertical synchronization signals of multiple types of images are prevented, and images are stabilized even when the relative display position is changed. .

[Embodiment] Hereinafter, an embodiment of an image processing apparatus according to the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 shows the configuration of an embodiment of this invention.

In FIG. 1, (11) is a normal video signal reproducing device, such as a video disc player, which outputs a standard composite video signal. (12) is a CG signal generation device compatible with the VGA system, which generates a computer graphics video signal (CG double signal. This CG double signal has a horizontal frequency twice that of a standard video signal, and a switch The video signal of the video disc player (11) is supplied directly to the switch circuit (13) via the double-speed scanning converter circuit (14). The output is the receiver (15
).

(16) is a genlock circuit, which includes a PLL circuit, is supplied with a horizontal synchronization signal and a vertical synchronization signal from the video disk player (11) and the CG signal generator (12), and is supplied with a clock from the genlock circuit (16). C.K.
is supplied to the CG signal generator (12), and the phase of the horizontal synchronization signal of the CG signal generator (12) is adjusted based on the horizontal synchronization signal from the video disc player (11).

(20) is a system control circuit, and CPU (20) is a system control circuit.
1) and a counter (22), it is supplied with horizontal and vertical synchronizing signals from the video disc player (11), clock CK is supplied from the genlock circuit (16), and the CG signal is supplied from the system control circuit (20). Control signals are supplied to the signal generator (12) and the switch (13).

K is an operation key.

Next, the operation of one embodiment of the present invention will be described with reference to FIGS. 2 and 3.

In this example, 00 image (
2), as shown in FIG. 2, first detect the vertical retrace period (V, Ret), wait for this to end (step Sll, 512), and then, for example, change the display position in FIG. At the timing shown by the arrow t1, only the vertical period (total number of lines) Vtotal of the display parameters is changed (step 513), and the counter (22) of the system control circuit (20) is set to a required value.

As a result, as shown in FIG. 3B, the width Nba of the pose (4b) immediately after the display area (3) of the 00 image in the current field including the time t1 is the same as that of the previous field, and the width Nba of the vertical position of the 00 image No phase shift occurs between the synchronization signal and the vertical synchronization signal of the video image shown in FIG.

In addition, in the subsequent field, the display area of the 00 image (
The setting width Nta of the pause (4t) immediately before 3) is the same as that of the current field and the preceding field, but it is changed by the increase/decrease in the vertical scanning period Vtotal of the current field (
n), the width Ntb of the actual pose (4t) is wider (
or become narrower).

Then, in step S14 in FIG. 2, the next vertical retrace period (ν, Re t) is detected, and after waiting for the start of the displayable period (step 5I5), arrow t2 is shown in FIG.
At the timing shown in (step 516), the total number of lines VtoLal of the display parameter is returned to its original value, and at the same time, the blank start point and return line start point are changed (step 516).

As a result, as shown in FIG. 3B, the width Nbb of the pose (4b) immediately after the display area (3) of the 00 image in the subsequent field including time t2 is changed to a required value, and this subsequent field From now on, there will be no phase shift between the vertical synchronization signal of the 00 image and the vertical synchronization signal of the video image shown in FIG. (step 816).
) may be performed after the 12th point in the subsequent field.

[Effects of the Invention] As described in detail above, according to the present invention, when the display positions of multiple types of multimedia images displayed in a superimposed manner are relatively moved, the vertical synchronization of the reference image is The amount of movement is set after the first signal is detected, and the set movement is executed after the next writing point synchronization signal is detected, so the configuration is simple and increases in cost can be avoided. An image processing device in which images are stable even when the relative display positions of a plurality of types of images are changed can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of an image processing apparatus according to the present invention, FIG. 2 is a flowchart for explaining the operation of an embodiment of the second invention, and FIG. 3 is an embodiment of the invention. FIG. 4 and FIG. 5 are conceptual diagrams for explaining the present invention. FIG. 6 is a flowchart for explaining the operation of a conventional image processing device. FIG. 7 is a waveform diagram for explaining the operation of an example. is a waveform diagram for explaining the operation of the conventional example. (11) is a video disc player, (12) is a CG signal generation circuit, and (20) is a system control circuit.

Claims (1)

[Claims] In an image processing device configured to display a plurality of types of images each having a predetermined display width on the same display device, the display position of one image is moved with respect to the display position of the other image. When, after first detecting the vertical sync signal of one of the images, the amount of movement of the other image is set, and the amount of movement of the other image is set after the vertical sync signal next to the vertical sync signal detected first is detected. An image processing device characterized by performing movement.