JPH0510465Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a video signal processing device suitable for application to, for example, a camera-integrated video tape recorder.

[Prior Art] Conventionally, for example, in a camera-integrated video tape recorder, it has been known to insert a text title into the image capture screen.

[Problem that the invention aims to solve] In addition to this text title, it is also possible to insert a sub-screen of a still image as a type of title, for example, inserting a still image showing the contestants on the screen of an event such as a sports day. It is possible to do so.

In this case, by combining a still image sub-screen with a text title, a wide variety of titles will be available, and more effective title recording is expected.

However, when the text title overlaps the still image sub-screen, the still image sub-screen becomes unsightly and there is a risk that the display effect will be diminished.

Therefore, in this invention, the text title does not overlap with the sub-screen of the still image.

[Means for Solving the Problems] This invention includes a signal processing circuit having an image memory for forming a video signal for a still image sub-screen from a video signal, and a signal processing circuit for forming a character title display signal from the video signal. a title circuit, and a first circuit that inserts a character title display signal from the title circuit into the video signal.
and a second insertion circuit for inserting a video signal for a child screen from a signal processing circuit into the video signal, and the second insertion circuit is disposed after the first insertion circuit. This is a characteristic feature.

[Operation] In the above configuration, the second insertion circuits 24, 3
2 is placed after the first insertion circuits 11 and 26, so that after the character title display signal is inserted into the video signal, the video signal for the still image child screen is inserted. In other words, the text title will no longer overlap the still image child screen.

[Example] Hereinafter, an example of this invention will be described with reference to FIG. This example is an example applied to a camera-integrated video tape recorder.

In the figure, reference numeral 1 denotes an image sensor, for example a CCD solid-state image sensor, and an image signal from the image sensor 1 is supplied to a process circuit 3 via an AGC amplifier 2, which outputs a luminance signal Y and a color difference signal. R-Y and B-Y are output.

Further, the imaging signal from the imaging device 1 is supplied to a level detector 4, and the detection signal is supplied as a control signal to an iris driver 5. Iris 6 is driven. In this case, the opening of the iris 6 is controlled according to the level of the imaging signal,
It is controlled to open when the illuminance is below the recommended illuminance, for example below 200 lux.

Further, the output signal of the AGC amplifier 2 is supplied to the level detector 7, and the detection signal is supplied to the AGC amplifier 2 via the amplifier 8 as an AGC control signal. As a result, the AGC amplifier 2 operates at less than the recommended illuminance, and the level of the output signal of the AGC amplifier 2 is kept constant. Note that 2a is a potentiometer for setting the maximum gain of the AGC amplifier 2.

Further, the luminance signal Y output from the process circuit 3 is supplied to the insertion circuit 11 via a series circuit of a γ correction circuit 9 and an amplifier 10. The output signal of this insertion circuit 11 is supplied to an encoder 12, and a synchronization signal is added thereto.

The luminance signal Y output from the encoder 12 is 1
bit A/D converter 13;
The D converter 13 forms character title data. That is, the A/D converter 13 includes a comparator 13a, and the luminance signal Y from the encoder 12 is converted to a reference voltage by the comparator 13a.
It is compared with Vref, and character title data is output from this comparator 13a. For example, when the luminance signal Y is as shown in FIG. 2A, the comparator 13a outputs character title data as shown in FIG. 2B.

The character title data output from this A/D converter 13 is supplied to a title circuit 14, and character title data for one screen is written into a memory (not shown).

This title circuit 14 is controlled by a controller 15 having a microcomputer, and data is written into the memory by operating a keyboard 16. When the character title insertion mode is selected, the memory is stored in the sub-screen insertion mode (hereinafter referred to as "SinP mode") as described later, except for the period until the video signal for the sub-screen is written to the field memory. Character title data is read out, and based on this character title data, a character title display signal for displaying characters in a designated color is output. Note that the color is specified by operating the keyboard 16.

The above-described insertion circuit 11 is supplied with a luminance signal forming a character title display signal from the title circuit 14 and inserted into the luminance signal from the amplifier 10.

Further, the luminance signal Y output from the encoder 12 is supplied to an A/D converter 17, which converts it into a digital signal and then supplies it to the field memory 18 as a write signal.

This field memory 18 is connected to the memory control circuit 1
It is controlled by controller 15 via 9.

In this case, when not in the SinP mode, writing is performed without thinning out the write data in the vertical and horizontal directions, and reading is performed in parallel.

In addition, when the SinP mode is set, write data is thinned out vertically and horizontally to 1/4, and writing is performed and reading is performed in parallel.
Only reading is performed after the field.
As a result, the field memory 18 outputs a luminance signal for the child screen.

This reading is performed at timings corresponding to any of four locations: lower right, upper right, lower left, and upper left of the screen. This read timing is set by the keyboard 16 connected to the controller 15 before or after the SinP mode is set. Note that the thinning may be performed at the time of reading.

The controller 15 is connected to an operation key 20 for setting the character title insertion mode, an operation key 21 for setting the SinP mode, and an operation key 22 for setting the recording mode or recording standby mode.

Further, the output signal of the field memory 18 is D/
After being converted into an analog signal by the A converter 23, it is supplied to the fixed terminal on the a side of the changeover switch 24.
A brightness signal Y output from the encoder 12 is supplied to a fixed terminal on the b side of the changeover switch 24.

This switching of the changeover switch 24 is controlled by the memory control circuit 19. In this case, SinP
When not in the mode, it continues to be connected to the a side. On the other hand, in the SinP mode, the field memory 18 is connected to the a side during the period when the luminance signal for the child screen is outputted, and the other periods are connected to the b side.

The output signal of this changeover switch 24 is
is supplied as a recording signal to

Further, the color difference signals R-Y and B-Y outputted from the process circuit 3 are supplied to the encoder 12 via the insertion circuit 26, and are subjected to quadrature two-phase modulation by the encoder 12, and then the color signal C (color subcarrier frequency teeth,
For example, it is output as 3.58MHz).

The insertion circuit 26 is supplied with a color difference signal forming a character title display signal from the title circuit 14 and inserted into the color difference signal from the process circuit 3.

The encoder 12 color signal C is sent to the A/D converter 2
After being converted into a digital signal in step 7, it is supplied to a color demodulation circuit 28, which outputs color difference signals R-Y and B-Y dot-sequentially.

Color difference signals R-Y, B from this color demodulation circuit 28
-Y is supplied to the field memory 29 as a write signal. This field memory 29 is
It is controlled by a memory control circuit 19 in the same manner as the field memory 18 described above.

The output signal of this field memory 29 is supplied to a color modulation circuit 30, and the color signal C outputted from this color modulation circuit 30 is converted into an analog signal by a D/A converter 31, and then is applied to the a side of the changeover switch 32. Supplied to fixed terminals. A color signal C output from the encoder 12 is supplied to a fixed terminal on the b side of the changeover switch 31.

The switching of the changeover switch 32 is controlled by the memory control circuit 19 in the same manner as the changeover switch 24 described above. The output signal of this changeover switch 32 is supplied to the VTR 25 as a recording signal.

The operation of the VTR 25 is controlled by the VTR control circuit 33.
It is controlled by the controller 15 via.

Further, the output signal of the changeover switch 24 is supplied to an electronic viewfinder 35.

In the above configuration, in the recording standby mode, the changeover switches 24 and 32 are connected to the a side, and the field memories 18 and 29 are written without thinning and read in parallel, so that the VTR 25 is supplied with the video signal of the subject currently being photographed. At this time, the subject is displayed on the ECF 35 (as shown in FIG. 3A).

In this state, when the operation key 22 is pressed to enter the recording mode, the video signal of the subject currently being photographed is recorded on the VTR 25.

Also, in the recording standby mode, press the operation key 20.
When the character title insertion mode is entered by pressing , the luminance signal and color difference signal forming the character title display signal are output from the title circuit 14, and are inserted by the insertion circuits 11 and 26, respectively.
The VTR 25 is supplied with a video signal into which a character title display signal is inserted. In this case, EVF35
A screen of the subject being photographed is displayed with a text title inserted (as shown in Figure B).

In this state, when the operation key 22 is pressed to enter the recording mode, the VTR 25 records a video signal into which a character title display signal has been inserted. Note that even if the recording mode is changed to the character title insertion mode, a video signal into which a character title display signal is inserted can be recorded in the same way.

Also, in the recording standby mode, the operation key 21
When pressed to enter the SinP mode, the write data in field memories 18 and 29 is thinned out to 1/4 in the vertical and horizontal directions, and data is written and read in parallel. only reading is performed and the video signal for the sub-screen is output. Further, the changeover switches 24 and 32 are connected to the a side during the period when the field memories 18 and 29 output video signals for the child screen, and are connected to the b side during the other periods.

Therefore, before 4 fields have elapsed, the VTR 25 is supplied with a video signal with a video signal for a sub-screen of a moving image inserted, and after 4 fields have elapsed, a video signal with a video signal for a sub-screen of a still image inserted is supplied. A video signal is supplied. in this case,
The EVF 35 displays a screen with a video sub-screen inserted before 4 fields have elapsed, and a screen with a still image sub-screen inserted after 4 fields have elapsed (as shown in Figure C). ).

In this state, when the operation key 12 is pressed to enter the recording mode, the VTR 25 records the video signal of the subject currently being photographed into which the video signal for the sub-screen has been inserted. Note that even if the recording mode is changed to the SinP mode, a video signal into which a sub-screen video signal is inserted can be recorded in the same way.

For example, when a sub-screen is inserted at the lower right of the screen as shown in FIG. 3C, the screen based on the video signal from the encoder 12 becomes as shown in FIG. The screen based on the video signal is as shown in FIG.

The insertion position of the child screen can be arbitrarily set to the lower right, upper right, lower left, or upper left by operating the keyboard 16 (see the broken line in FIG. 4B).

Also, in the recording standby mode, press the operation key 20.
Press to enter text title insertion mode, and
When you press operation key 21 to enter SinP mode,
The VTR 25 is supplied with a video signal into which a character title display signal and a video signal for a small screen are inserted. In this case, the EVF 35 displays a screen with a text title and a sub-screen inserted (the third
(This is shown in Figure D; for the sake of simplicity, the screen of the subject currently being photographed in Figure A is not shown in Figures D to F.)

Here, the character title display signal is not output from the title circuit 14 during the period until the video signal for the child screen is written to the field memories 18 and 29, that is, the period of 4 fields after the SinP mode is set, so the character title is inserted. Even if the mode is followed by the SinP mode, a text title is not inserted into the sub-screen (see E in the same figure).
Furthermore, since the character title display signal is inserted before the video signal for the child screen is inserted, the character title does not overlap with the child screen (see F in the same figure).

In this state, when the operation key 22 is pressed to enter the recording mode, the VTR 25 records the video signal of the subject currently being photographed into which the text title and the video signal for the sub-screen have been inserted. In addition, from recording mode to text title insertion mode and SinP
In this mode, it is also possible to record a video signal in which a text title and a video signal for a small screen are inserted.

As described above, according to this example, the insertion of the character title display signal is performed by the insertion circuits 11 and 26,
Switch 24 to switch the video signal for the still image sub-screen
and before being inserted at 32. Therefore, the text title is not displayed overlapping the still image sub-screen, and the still image sub-screen does not become unsightly, so the combination of text title and still image sub-screen can be effectively Title recording can be performed.

Further, according to this example, the title circuit 14 does not output the character title display signal during the period until the video signal for the child screen is written to the field memories 18 and 29, that is, during the period of 4 fields after the SinP mode is set. Therefore, even if you enter SinP mode after text title insertion mode, the text title will not be inserted on the sub screen.

[Effect of the invention] As explained above, according to this invention, the video signal for the sub-screen is inserted after the text title display signal is inserted into the video signal, so the text title is displayed on the sub-screen of a still image. are not displayed overlapping each other. Therefore, since the still image sub-screen does not become unsightly, it is possible to perform effective title recording by combining the text title and the still image sub-screen.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of this invention, and FIGS. 2 to 4 are diagrams for explaining the same. 1...Image sensor, 2...AGC amplifier, 3...
Process circuit, 4, 7... Level detector, 6...
Iris, 11, 26... Insertion circuit, 12... Encoder, 13... 1-bit A/D converter, 1
4...Title circuit, 15...Controller, 1
6... Keyboard, 17, 27... A/D converter, 18, 29... Field memory, 19...
Memory control circuit, 20-22...operation key, 2
3, 31... D/A converter, 24, 32... Changeover switch, 25... VTR, 33... VTR control circuit, 35... Electronic viewfinder.

Claims (1)

[Claims for Utility Model Registration] A signal processing circuit comprising an image memory for forming a video signal for a sub-screen of a still image from a video signal; a title circuit for forming a character title display signal from the video signal; a first insertion circuit that inserts a character title display signal from the title circuit into the video signal; and a second insertion circuit that inserts a sub-screen video signal from the signal processing circuit into the video signal. . A video signal processing device, wherein the second insertion circuit is arranged after the first insertion circuit.