JPS62295588A - Picture synthesizer - Google Patents

Abstract

PURPOSE:To recognize a part having a difference in level as a flicker picture visually by outputting one of plural video signals selectively and switching the selective operation in the timing of a vertical synchronizing signal sequentially and displaying the result on a monitor picture. CONSTITUTION:Video signals of objects 1, 2 picked up independently by camera heads 3, 4 are converted into video signals under the control of camera controllers 5, 6 and the result is fed to a picture synthesizer 7. The video signal is subjected to field switching and the synthesized picture of the objects 1, 2 is displayed on a monitor TV8. As for the picture 1a of the object 1 where two pictures are overlapped, a still picture is obtained, but a picture not overlapped is a video display at each other field and the result is caught visually as flicker display.

Description

DETAILED DESCRIPTION OF THE INVENTION 3. Detailed Description of the Invention (Technical Field of the Invention) The present invention relates to a screen compositing device that displays screens V&shadowed by a plurality of video cameras in a composite manner on a single monitor screen.

(Background of the Invention) Conventionally, in a device that synthesizes and displays captured images of different subjects captured by multiple television cameras on a monitor screen for observation, the video signals obtained from multiple television cameras are electrically mixed. to create one screen.

(Problems to be Solved by the Invention) However, in such a conventional device that electrically mixes multiple video signals to obtain a composite screen, it is difficult to solve the level difference between the multiple video signals. Difficult to distinguish on monitor screen. In other words, the level difference between video signals can only be seen as a difference in the brightness level of each subject on the composite screen, and when multiple subjects with no difference in brightness level are displayed compositely, the difference in the level of each subject It is difficult to tell where the boundaries are. Therefore, for example, when aligning multiple subject patterns on the screen,
Depending on the subject, it may be difficult to distinguish whether or not there is a positional shift between the two on the composite screen.

(Object of the Invention) The present invention has been made in view of the above-mentioned conventional problems. An object of the present invention is to provide a screen composition device that facilitates shape comparison between objects and confirmation of positional deviation between objects of the same shape.

(Summary of the Invention) In order to achieve this object, in the present invention, a plurality of video ML type devices are synchronously coupled, and one of the plurality of video signals obtained from the plurality of video imager devices is selected. At the same time as output, this selection operation is sequentially switched at the timing of the vertical synchronization signal and displayed on the monitor screen.
This allows the image to be recognized as a flicker image.

(Example) FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

First, to explain the configuration, numerals 3 and 4 are camera heads of a video imaging device, and the camera heads 3 and 4 are directed to different subjects 1 and 2 through an optical system, and a camera controller 5,
6, it is controlled to output a video signal from a photoelectric conversion signal of a subject obtained by two-dimensional scanning of a solid-state image pickup device such as a decoy image tube or a CCD. Reference numeral 7 denotes a screen compositing device that synthesizes each video signal obtained through each of the camera controllers 5 and 6, and supplies the video signals synthesized by the screen compositing device 7 to a monitor television 8 to display a composite screen. These camera control devices 5, 6, screen composition device 7, and monitor television 8 are synchronously connected.

FIG. 2 is a block diagram showing an embodiment of the screen compositing device 7 that is similar to the embodiment of FIG. 1.

In FIG. 2, 11 and 13 are input terminals to which video signals captured by the camera heads 3 and 4 are input via the camera controllers 5 and 6 shown in FIG. 1, and 12 is a vertical synchronization signal and This is a synchronization signal input terminal to which a synchronization signal including a horizontal synchronization signal is input. Following the input terminal 11.13 to which the video signal is input is a clamp circuit 14. ．． 16, each video signal is subjected to DC reproduction processing by clamp circuits 14 and 16, and the DC levels of the two different video signals are matched by this DC reproduction. Clamp circuit 1
4.16 are followed by video blanking circuits 17 and 19 that operate as video signal selection circuits, and each of the video blanking circuits 17 and 19 is controlled by a blanking pulse from a blanking pulse generating circuit 18. be done. A pulse shaping circuit 15 extracts and inputs only the vertical synchronizing pulse VD from the synchronizing signal from the synchronizing signal input terminal 12 to the blanking pulse generating circuit 18 . In response to VD, the blanking pulse generating circuit 1B
The pulse signal shown in FIG. (See Figure 3 (A)) to apply video blanking to the torque level, and at the same time, set the pulse signal to the video blanking circuit 19 (see Figure 3 (B)) to 1- level to cancel blanking.J: Sea urchin Become.

-5= When the next vertical synchronization pulse VD comes, the pulse signal is inverted, the blanking of the video blanking circuit 17 is canceled, and the video blanking circuit 19 is blanked. For this reason, the video blanking circuit 17.1
For the signal synthesis circuit 20 which receives the output of 9, the video signal from the input terminal 11 and the video signal from the input terminal 13 are inputted alternately at the generation interval of the vertical domeishin 8VD, that is, every other field in the interlaced system. A video signal is inputted, is further applied from the signal synthesis circuit 20 to the output circuit 21, and is output from the output terminal 22 to the monitor television 8 shown in FIG.

Next, to explain the operation of the above embodiment, as shown in FIG. The signal is converted into a video signal and supplied to the screen synthesis device 7. The screen composition device 7 has a circuit configuration shown in FIG. 2, and, for example, a video signal from the camera controller 5 is applied to an input terminal 11, and a video signal from the camera controller 6 is applied to an input terminal 13. Each video signal applied to the input terminal 11.13 undergoes DC reproduction by the clamp circuit 'I11.16, and is input to the video blanking circuit 17.19.

On the other hand, a synchronization signal including horizontal and vertical synchronization pulses is applied to the synchronization signal input terminal 12, and only the vertical synchronization signal VD is taken out by the pulse shaping circuit 15 and applied to the blanking pulse generation circuit 18. The blanking pulse generating circuit 1B supplies a pulse signal whose signal level is inverted every time the vertical synchronizing signal QVD is input to the video blanking circuits 17 and 19.

For example, as shown in FIG. 3 (△) (B), this pulse signal is used as a truvel when one side is a truvel. For example, when the video blanking circuit 17 is blanked, the The blanking circuit 19 is in a blanking release state. For this reason, for example, the video blanking circuit 1
If the video signal shown in FIG. 3(C) is input from the clamp circuit 14 to the video blanking circuit 19, and the video signal shown in FIG. Since the video blanking circuit 17 is in a blank state at the first timing in the timing chart shown in the figure, the output of the video signal is prohibited.
The video signal shown in FIG. 3 (D>) is applied to the signal synthesis circuit 20 through the video blanking circuit 19 which is in the unblanked state.

At the timing when the next vertical synchronization signal VD is obtained, the blanking and blanking states of the video blanking circuit 17 and 19 are reversed, and the video signal shown in FIG. 3(C) passes through the video blanking circuit 17. is given to the signal synthesis circuit 20, and thereafter every 1q of vertical synchronization signals VD is given to the signal synthesis circuit 20.
The field switching of the video signals shown in FIGS.

After receiving the field switching of the two video signals input to the screen composition device 7, the subject 1 is displayed on the monitor TV 8.
A composite screen of subject 2 and subject 2 will be displayed, and the first
On the screen of the monitor television 8 shown in the figure, the image of subject 1 is 1a and the image of subject 2 is 2a, and for the image 1a of subject 1 where the two images overlap, the display operation is performed for each field. , it becomes a still image, but images 1a and 2a do not overlap and only 28 are marked.The image in the shaded area is a video display every other field.
The image shown in the shaded area can be visually perceived as a flicker display. That is, according to the screen composition of the present invention, the graphical difference between the two subjects is visually recognized as a flicker display on the 72T screen, making it possible to compare the two screens extremely easily.

Fig. 4 is an explanatory diagram when performing screen composition of subjects 1 and 2 depicting the same figure, and even if the subjects have the same shape, the positional relationship between camera heads 3 and 4 and subject 1°2 is different. For example, on the composite screen of the monitor television 8, the shift indicated by the hatched area appears as a flicker screen, and it is possible to accurately identify whether a position shift has occurred by the presence or absence of the flicker display.

Although the above embodiment takes as an example the composition of two screens captured by two video imaging devices, the present invention is not limited to this, and can be applied as is to composition of any number of screens. can do. However, when compositing three or more screens, it is preferable to use non-interlace so that the overlapping parts of the images do not flicker.

In addition, the blanking pulse generation circuit 1B shown in FIG.
By controlling the blanking pulses output to the video blanking circuits 17 and 19, it is possible to display only the screen based on one of the video signals, or even to create a composite screen in which no flicker is visible even if it is a composite screen. It's easy to do.

Furthermore, although the above embodiments take the interlaced method as an example, the present invention is not limited to the interlaced method, and also applies to non-interlaced methods, in which video signals are sequentially transmitted at the timing of vertical synchronization pulses for a plurality of video signals. By switching, it is possible to visually recognize the non-overlapping portions of the composite screen as a flicker display in exactly the same way.

(Effects of the Invention) As described above, according to the present invention, one of the video signals output from a plurality of video image devices is selectively output, and the selected output is synchronized with the timing of the vertical synchronization signal. Since the composite screen is displayed on the monitor TV by switching sequentially, when the video signals are switched sequentially at the timing of the vertical synchronization signal, the subject image at the screen position where the level difference occurs will be visible as a flicker display, making it difficult to composite multiple subjects. Even when displayed on a screen, the boundaries of each subject can be clearly recognized.

For this reason, when the subject of the reference pattern and the subject pattern of the subject to be inspected are synthesized on the screen, whether or not the subject pattern matches the reference pattern is determined by whether or not there is a flickering part. It can be easily identified, and when used for defect inspection of mask patterns, for example, defect inspection can be performed extremely easily.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing a specific embodiment of the screen synthesis device shown in FIG. 1, and FIG. The timing chart shown in FIG. 4 is an explanatory diagram when the same subject is removed using the embodiment shown in FIG. 1.2: Subject 3.4: Camera head 5.6: Camera controller 7: Screen composition device 8: Monitor TV 11.13: Input terminal 12: Synchronization signal input terminal 15: Pulse shaping circuit 17.19: Video block Ranking circuit 18 Blanking pulse generation circuit 20: Signal synthesis circuit 21: Output circuit 22: Output terminal

Claims (1)

[Claims] a plurality of synchronously coupled video imaging devices, and a selection circuit that selectively outputs one of the video signals output from the plurality of video imaging devices and sequentially switches the selected output at the timing of a vertical synchronization signal; A screen synthesizing device comprising: an output circuit that outputs the video signal obtained from the selection circuit to a monitor television to display the images taken by the plurality of video imaging devices in a composite manner.