JPH0436630B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a video image switching device, and in particular,
The present invention relates to a two-screen switching device that is suitable for a video game device using a VTR (video tape recorder) and is capable of separating a desired image from recorded and combined video signals and switching the selection.

[Conventional technology]

Conventionally, there have been video game devices that allow users to enjoy games by combining video signals from a VTR and video game game patterns. (For example, Japanese Patent Application Laid-Open No. 55-26791) [Problems to be Solved by the Invention] However, in the above-mentioned conventional television game device, only one type of video signal can be transmitted from the VTR at the same time. There was a problem in that the images could not be switched instantaneously as the game progressed. For example, in a boxing game,
It is possible to have a match between the opponent's player sent from the VTR and the player's player who is synthesized by superimposition, but even if the player's player lands a punch at the right time, the Since it was not possible to switch between the two, it was not possible to depict the down scene of the opponent's player. For this reason, there was a problem that children could not enjoy the atmosphere of actually boxing, and the children would quickly get bored with it.

[Means for solving problems]

The present invention was devised in view of the above problems, and
A video signal for inputting a composite video signal in which an image A formed by every other scanning line and an image B formed by scanning lines other than the scanning lines forming the image A are combined. an input means, an identification detection means for identifying whether each scanning line of the composite video signal constitutes an image A or an image B, and a detection signal of the identification detection means to determine which of the composite video signals is selected. A scanning line selection means for outputting a video signal corresponding to a scanning line constituting either image A or image B, and scanning lines other than the scanning line selected by the scanning line selection means to a desired brightness. and a complementary signal generating means for scanning the image A or image B from the composite video signal.
It is characterized by selectively switching only one of them.

[Effect]

In the present invention configured as described above, the video signal input means is formed by an image A formed by every other scanning line and a scanning line other than the scanning line forming the image A. A composite video signal in which image B is composited is input from the VTR's video equipment, and the identification detection means determines whether each scanning line of the input composite video signal constitutes image A or image B. identify The detection signal of the identification detection means is transmitted to the scanning line selection means, and the scanning line selection means selects a video signal corresponding to a scanning line constituting either image A or image B among the scanning lines of the composite video signal. Select only and output to an external device, etc. Then, the complementary signal generating means causes the scanning lines other than the scanning line selected by the scanning line selecting means to be scanned at a desired brightness. Therefore, it is possible to separate either image A or image B from the composite video signal and to switch the selection as appropriate, and also to select the scanning line corresponding to the video signal from which the complementary signal generating means has been cut off. Since the light is emitted at the brightness of , it is possible to prevent the brightness of the entire screen from decreasing. In particular, when the composite video signal is a composite video output signal from video equipment such as a VTR that does not require external synchronization, a synchronization separation circuit provided in the video signal input means separates the synchronization signal from the composite video signal and further vertically converts the synchronization signal from the composite video signal. It is used to reproduce synchronization signals and the like. If an image memory is provided in the complementary signal generating means, it is possible to generate a video signal that is identical to the scanning line [(N-1) number] immediately above the scanning line [Nth number] to be complemented. I can do it. Similarly, if an integrating circuit is provided in the complementary signal generating means, it is possible to generate a video signal that has the average brightness of the [(N-1)th] scanning line.

〔Example〕

An embodiment of the present invention will be described based on the drawings. Reference numeral 1 denotes a video input means for inputting a composite video signal S, which includes a first video signal amplification circuit 11, a clamp circuit 12, and a synchronous separation circuit 13. It is made up of The composite video signal S of this embodiment is a composite video signal in which a luminance (Y) signal, a color difference (C) signal, and a horizontal/vertical synchronization signal are combined. As shown in FIG. 2, the composite video signal S is composed of two images formed by every other scanning line. That is, odd numbers (1, 3, 5...) as shown in Figure 2b.
The image A formed by the scanning lines of ("A" is drawn) and the even numbers (2,
Image B formed by scanning lines 4, 6...)
(indicated by "B") are synthesized to form a composite video signal S as shown in FIG. 2a. The first video signal amplification circuit 11 amplifies a composite video signal from a VTR (video tape recorder) or the like to a desired voltage level, and has a GB product of about 100MHz, low output impedance, and a large output current. desirable. The clamp circuit 12 is for fixing the level of a video signal whose DC level is uncertain. Since a video signal has no fixed DC potential, it is generally transmitted and received by cutting off the DC component using a capacitor or the like. but,
Since the direct current component of a general video signal is a luminance signal, the signal must be clamped (level fixed) on the receiving side. This clamp circuit 12 includes, for example, a method in which a clamp comparator controls the bias of an amplifier. The synchronization separation circuit 13 separates a synchronization signal from the input composite video signal and also reproduces a vertical synchronization pulse, and is also capable of reproducing a field discrimination signal. A comparator is used to extract the composite synchronization signal from the clamped video signal.
Generally, the width of the synchronization signal is about 5 μs, so it is desirable to use a medium-high speed comparator with a response time of 0.1 to 1 μs. There are analog and digital methods for reproducing the vertical synchronization signal from the separated composite synchronization signal, but an analog method using a comparator is preferable. The video signal input means 1 of this embodiment has a configuration compatible with composite video signals, but in the case of RGB separated signals, the horizontal/vertical synchronization signals are input in a separated state, so the synchronization separation circuit 13 is omitted. You can also do that.
However, there are cases where a synchronization signal is added only to the G signal, and in this case, the synchronization separation circuit 13 is added only to the G signal.
need to be connected. Furthermore, if the video signal is for a monochrome image and the depth of the synchronization signal is stable, the clamp circuit 12 can be omitted. Furthermore, if the input video signal has a sufficiently high signal level, the first video signal amplification circuit can be omitted. Reference numeral 2 denotes an identification and detection means for determining whether each scanning line of the composite video signal S is an odd number or an even number. That is, it identifies whether each scanning line constitutes image A or image B. The identification detection means 2 may be of a type that reads the scanning line number recorded during the vertical blanking period of the composite video signal S, or may be of a type of counting the scanning line number using a scanning line counter. That is, in this specification, the identification and detection means 2 need only be capable of identifying and detecting the number of each scanning line of the composite video signal S. Reference numeral 3 denotes a scanning line selection means, which selects an image A formed by odd numbered scanning lines (1, 3, 5...) of the composite video signal S or an even numbered scanning line (2, 5...).
Only the video signals corresponding to the scanning lines constituting one of the image B formed by the scanning lines 4, 6, . . . ) are output. Scanning line selection means 3
consists of an analog switch, and it is particularly desirable to use a high-speed video switch. That is, for this scanning line selection means 3,
For example, when a control signal is input to select image A based on odd-numbered scanning lines, only the video signal corresponding to the odd-numbered scanning lines is output based on the detection signal of the identification detection means. Therefore, if a composite video signal S as shown in FIG. 2a is input to the composite video signal input side, an image A as shown in FIG. 2b will be separated and output. Reference numeral 4 denotes complementary signal generating means for scanning scanning lines other than the scanning line selected by the scanning line selection means 3 at a desired brightness. The image separated by the scanning line selection means 3 has every other horizontal scanning line thinned out (that is, the number of scanning lines is halved), so the entire screen becomes dark and the thinned out scanning lines There is a problem that the parts of the image stand out. Therefore, the complementary signal generating means 4 causes the thinned out scanning line portions to emit light in order to prevent the brightness of the entire screen from decreasing. In this embodiment, the complementary signal generating means 4 calculates the average brightness value of the scanning line [(N-1)] immediately above the scanning line [N] to be complemented using an integrating circuit using a capacitor. , and is configured to generate a corresponding video signal. Although this method is analog processing, digital processing can also be performed as shown in FIG. In this method, the composite video signal S is first transferred to the AD converter 5.
The video signal of the scanning line [(N-1) number] immediately above the scanning line [N number] to be complemented is stored in the image memory 41, and the scanning line [N number] is (N-1)] It is possible to generate a complementary signal that is the same as the scanning line number (N-1). Then, by performing DA conversion on the output signal of the scanning line selection means 3 by the DA converter 6, a video analog signal can be obtained again. Reference numeral 7 denotes a second video signal amplification circuit, which amplifies the video output signal of the scanning line selection means 3. Note that if this video output signal is at a sufficient level, the second video signal amplification circuit 7 can be omitted. The composite video signal output of the second video signal amplification circuit 7 may be connected to a separate video game device or a superimpose device, or may be directly connected to a display having a composite video input terminal. . Note that when connecting to a general television receiver, it is necessary to input the output signal of the second video signal amplification circuit 7 to an RF converter and modulate it.

Next, to explain the operation of this embodiment, first, a video device such as a VTR is connected to the video input means 1. Here, the video equipment is not limited to a VTR, but any video equipment that outputs a composite video signal, such as a video disk device, is sufficient. Next, the videotape on which the composite video signal S has been recorded is loaded into the VTR device, and a playback operation is executed. A composite video signal S from a VTR is amplified by a first video signal amplification circuit 11, and then its level is fixed by a clamp circuit 12. The clamped composite video signal S is sent to the synchronization separation circuit 13 and also to the scanning line selection means 3 and the complementary signal generation means 4. The synchronization separation circuit 13 separates a horizontal synchronization signal (HSYNC) from the composite video signal S using a comparator, further reproduces a vertical synchronization signal (VSYNC), and sends the two synchronization signals to the identification detection means 2. The identification detection means 2 determines whether each scanning line is an odd number or an even number by reading the scanning line number recorded during the vertical blanking period of the composite video signal S or by counting the scanning lines with a scanning line counter. Determine if there is. When a control signal to select the image A based on odd-numbered scanning lines is input to the scanning line selection means 3, the scanning line selection means 3 selects the video signal corresponding to the odd-numbered scanning lines. The signal is directly sent to the second video signal amplification circuit 7. When a video signal corresponding to an even-numbered scanning line is input, the scanning line selection means 3 cuts off the composite video signal S and switches to the video signal from the complementary signal generation means 4 for output. For example, for the scanning line selection means 3, the fifth
When the fifth scanning line is input, the composite video signal S is output as is, and the video signal corresponding to the average brightness of the fifth scanning line is stored in the complementary signal generating means 4. Ru. Then, when the sixth scanning line is input to the scanning line selection means 3, the scanning line selection means 3 cuts off the composite video signal S, and the video signal stored in the complementary signal generation means 4 Output. Further, when the complementary signal generating means 4 using the digital processing method as shown in FIG. The digital video signal corresponding to the sixth scanning line is cut off, and the image memory 41
It is designed to output digital video signals stored in the . As a result, from the composite video signal S [Fig. 2 a], an image A is obtained by odd-numbered scanning lines.
[Figure 2 b] can be separated, and
Even-numbered scan lines can be replaced with scan lines based on complementary signals.

In this embodiment configured as described above, image A based on odd-numbered scanning lines or image B based on even-numbered scanning lines is selectively separated from the composite video signal S, and the complementary signal generating means 4 is thinned out. Since the scanning line [Nth] is supplemented with the average brightness of the scanning line [N-1], it is possible to prevent the brightness of the entire screen from decreasing and improve the clarity when wearing There is an effect that can be used. When the complementary signal generating means 4 performs digital processing using the image memory 41, there is an outstanding effect that the complementary scanning lines are not highlighted and an extremely easy-to-see screen can be provided. In particular, when this embodiment is applied to a boxing game, if an image of the opponent player is recorded on screen A of the composite video signal S and a down scene of the opponent player is recorded on screen B, screen A and a super You can have the player perform boxing with the player's imposed player, and if the player's player lands a punch at the right time, you can instantly switch to screen B, so you can see the opponent's down scene. It has the effect of depicting. The applicable embodiments are not limited to boxing games, but can also be applied to aircraft shooting games, missile games, etc. Further, this embodiment can be applied not only to the non-interlace scan method but also to the interlace scan method. In this case, it is desirable that images A and B be combined in both odd and even fields.

〔effect〕

In the present invention configured as described above, an image A formed by every other scanning line and an image B formed by scanning lines other than the scanning lines forming the image A are combined. a video signal input means for inputting a synthesized video signal, an identification detection means for identifying whether each scanning line constitutes an image A or an image B; scanning line selection means for outputting video signals corresponding to the constituent scanning lines; complementary signal generation means for causing scanning lines other than the scanning lines selected by the scanning line selection means to be scanned at a desired brightness; Since it consists of
Image A or image B can be selectively separated from the composite video signal, and scanning lines thinned out by image separation can be supplemented with the desired brightness, thereby reducing the brightness of the entire screen. This has the effect of being able to prevent this and improve clarity. In particular, if digital processing is performed using image memory, scanning lines will not stand out even with half the amount of information.
This has the effect of preventing deterioration in image quality. Furthermore, if the present invention is applied to video games, VTR
Since the images from the video equipment such as the above can be switched during game execution, it is possible to display completely different scenes on the display. Furthermore, by creating a VTR cassette based on a live-action TV program, children can experience the atmosphere of playing with real characters, and the video scenes change instantly, so they never get bored. It has an outstanding effect that can be enjoyed for a long time.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and in FIG. 2, a shows an image based on a composite video signal S, b shows an image A based on odd-numbered scanning lines, and c shows an image based on odd-numbered scanning lines. FIG. 3, which is a diagram showing an image B based on even-numbered scanning lines, is a diagram showing a complementary signal generating means 4 using a digital processing method. 1...Video input means, 2...Identification detection means, 3
...Scanning line selection means, 4...Complementary signal generation means.

Claims (1)

[Claims] 1. Image A formed by every other scanning line
and an image B formed by scanning lines other than the scanning lines forming the image A; Identification detection means for identifying whether it constitutes image A or image B;
scanning line selection means for outputting a video signal corresponding to a scanning line constituting either image A or image B out of the composite video signal according to the detection signal of the identification detection means; and the scanning line selection means and complementary signal generation means for scanning scanning lines other than the selected scanning line at a desired brightness, and selecting only one of image A or image B from the composite video signal. A video image switching device characterized by switching. 2. The video image switching device according to claim 1, wherein the composite video signal is composed of a composite video signal, and the video signal input means is provided with a synchronization separation circuit. 3. The video image switching device according to claim 1, wherein the composite video signal is an RGB separated signal and a synchronization signal. 4 The complementary signal generating means generates the scanning line [N
The video image switching device according to claim 1, wherein the video image switching device generates a video signal that is the same as that of the scanning line [(N-1) number] immediately above the scanning line [(N-1) number]. 5. The video image switching device according to claim 4, wherein the complementary signal generating means includes an image memory. 6 The complementary signal generating means generates the scanning line [N
2. The video image switching device according to claim 1, wherein the video image switching device generates a video signal that has the average brightness of the scanning line [(N-1)] immediately above the scanning line [(N-1)]. 7. A video image according to claim 1, in which the composite video signal performs interlaced scanning, and image A and image B are composited in both odd and even fields. Switching device.