JPH078025B2 - Image effect device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an image effect device for changing a scene change in a video camera, an editing machine or the like.

[Outline of Invention]

The present invention relates to an image effect device, which obtains a so-called mosaic fader effect with a simple configuration by sample-holding a baseband video signal with a pulse signal whose period is changed according to a fader signal. Is.

[Conventional technology]

Conventionally, in a consumer video camera, as a method of switching from the previous scene to the next scene, there is a method of instantaneous switching called so-called joint shooting, and a white / black fader is used to gradually change at the end of the previous scene. A method of changing the level of the image to white or black and gradually returning the level from the white or black screen to the normal signal level at the start of the next scene is used.

However, with such a method, the change of the scene change is scarce, and the demand of the user is not sufficiently satisfied.

On the other hand, there is a so-called mosaic fader method for changing scenes in professional equipment used in broadcasting stations and the like. This divides the screen into smaller parts than the number of pixels, and covers each part with the signal of a pixel contained in it to make the screen mosaic, and then to the end of the previous scene. At times, the number of divisions is gradually decreased, and at the start of the next scene, the number of divisions is gradually increased from the minimum state. However, in order to do this, a large number of expensive memory devices and the like are required, and it is extremely difficult to carry out this with a general consumer machine.

[Problems to be solved by the invention]

In the case of performing a so-called mosaic fader, there has been a problem that a large number of expensive memory devices and the like have been conventionally required and it is difficult to carry out with a general consumer machine.

[Means for solving problems]

According to the present invention, a fader signal generating means (12) for generating a fader signal whose level is gradually changed in relation to a start or end signal, and a period which is activated by a horizontal synchronizing signal and whose period is changed according to the fader signal The apparatus is provided with pulse signal forming means (14) and (18) for forming a pulse signal, and sample hold means (3) for sample-holding a baseband video signal using the pulse signal. The sample hold means (3) Is an image effect device characterized in that an image by a video signal is sampled and held in a horizontal direction based on a pulse signal.

[Action]

According to this, an image effect similar to a mosaic fader can be obtained with an extremely simple configuration.

〔Example〕

FIG. 1 shows the case where it is applied to a video camera. In the figure, image light from a subject (not shown) is a lens system (1).
Is supplied to the image pickup device (2) through the image pickup device (2) to form the picked-up image signals of the three primary color signals RGB. These signals are switches (31R) (31G) (31B) and capacitors (32R), respectively.
It is supplied to the gain control (GC) amplifier (4R) (4G) (4B) through the sample hold circuit (3) consisting of (32G) (32B), and the signal from this amplifier (4R) (4G) (4B) is encoder. The composite video signal is formed by being supplied to (5) and is supplied to the video tape recorder (VTR).

Further, the horizontal synchronizing signal HD, the vertical synchronizing signal VD, the blanking signal and the like from the synchronization generating circuit (7) are supplied to the image pickup device (2), the encoder (5) and the like.

In addition, a trigger switch (1
The signal (a) from 1) is supplied to the fader circuit (12), and the tally signal (b) from the VTR (6) indicates the recording state.
Accordingly, a fader signal (c) described later is formed.
Then, this fader signal is supplied to the gain control terminals of the amplifiers (14R) (14G) (14B) through the switch (13), the levels of the three primary color signals are controlled according to this signal, and the white and black faders described above are displayed. At the same time, the start / stop signal (d) described later is supplied to the VTR (6).

Further, the horizontal sync signal HD from the sync generation circuit (7) is supplied to the sync oscillator (OSC) (14), and further the switch (13)
Is supplied to the OSC (14), and a high-frequency pulse (e) having a duty of 50% whose period is controlled according to the fader signal is formed in synchronization with the HD signal. This pulse is supplied to one fixed contact of the switch (15), and this pulse is supplied to the other fixed contact through the inverter (16).

Further, the vertical synchronization signal VD from the synchronization generation circuit (7) is supplied to the synchronization oscillator (OSC) (17), and a pulse (f) that is inverted every time corresponding to, for example, 20 horizontal periods is synchronized with this VD signal. It is formed, and the switch (15) is switched by this pulse.

Then, the signal from the switch (15) is supplied to the monostable multivibrator (monomulti) (18), and, for example, a sampling pulse (g) is formed at each rising edge of the signal. This pulse is supplied to the sample hold circuit (3) through the OR circuit (19), and the switch (31R) (31G)
(31B) is turned on.

Further, the blanking signal from the synchronization generating circuit (7) is supplied to the OR circuit (19). Fader circuit (12)
A signal (h) indicating that the fader operation has been released from is supplied to the OR circuit (19).

Further, a part of the fader signal supplied to the OSC (14) is supplied to the lens system (1), and zoom, focus, etc. are controlled as described later.

That is, in this device, when the trigger signal (a) is supplied as shown in FIG. 2A, the tally signal (b) from the VTR (6) is at a low potential (VTR is stopped as shown in FIG. 2B). State), the tally signal (b) is at a high potential (VTR is recording state), and the fade-out fader signal (c) (see C in the figure) is the fader circuit (1).
It is formed in 2). Further, a VTR start / stop signal (d) as shown in FIG. 7D and a fader cancellation signal (h) as shown in FIG.

In addition, the horizontal sync signal HD as shown in FIG.
And a pulse (e) having a predetermined cycle synchronized with the HD signal is formed as shown in FIG. This pulse (e)
Are supplied to the monomulti (18), and the sampling pulse (g) is formed at the rising edge of the pulse (e) as shown in FIG. Further, the vertical sync signal VD as shown in FIG.
By being supplied to the OSC (17), a pulse (f) having a predetermined cycle synchronized with the VD signal is formed as shown in FIG. 8E, and the switch (15) is switched by this pulse (f),
During the period when the switch (15) is switched, the sampling pulse (g) is formed at the trailing edge of the pulse (e) as shown in FIG.

Then, according to the above-mentioned fader signal (c), for example, when the fader signal (c) is at a high potential, the cycle of the OSC (14) is shortened; ) Is changed as indicated by an arrow, and the position where the sampling pulse (g) is formed is gradually fined during the fade-in and coarsened during the fade-out.

Therefore, when the video signal is sampled and held using such a sampling pulse (g), for example, a mosaic screen as shown in FIG. 4 is formed. Each vertical line in the figure is a sampling position.

By changing the sampling position by the fader signal (c), for example, when there is an original image as shown in FIG. 5A, this image is changed as shown in B → C in FIG. At the time of fade-in, the screen can be changed by changing the screen as shown in D in the figure to E → F in the figure.

In this way, a change in the image similar to a so-called mosaic fader can be performed, and a new type of scene change can be provided to the user.

In the device described above, the OR circuit (19) switches (31R) (31G) (31R) during the blanking period and fader release.
B) is provided to fix on. At this time, the capacitance values of the capacitors (32R) (32G) (32B) are small values that do not affect the signal transmission.

Also, in the above-mentioned device, the image at the sampling position is not a perfect mosaic but becomes a striped image drawn horizontally,
This is done by, for example, combining the fader signal with the zoom of the lens system (1) from the telephoto to the desired distance at the time of fade-in, from the predetermined distance to the telephoto at the time of fade-out, or by intentionally shifting the focus. An image that more closely resembles a mosaic can be obtained.

Further, in the above-mentioned device, the range of the mosaic in the vertical direction is constant, but the feeling of the mosaic is emphasized by shifting the sampling position by 1/2 for each range as described above.

Further, in the above example, the size of the mosaic is changed according to the fader signal as the fader device, but this can also be used for the effect of displaying the mosaic of a constant size with the voltage as the constant voltage.

Further, in the above example, the RGB three primary color signals are sampled and held, but the luminance signals Y and the color difference signals of RY and BY may be sampled and held in the baseband.

Further, when the above-mentioned image pickup device (2) is a CCD, a sampling and holding circuit is provided at the output part thereof, so that sampling pulses are thinned out (corresponding to changing the cycle), and the like effect is obtained. Can be obtained.

Furthermore, this device is not limited to a video camera, but can be applied to an editing device or the like that temporarily returns a video signal to the baseband for processing.

〔The invention's effect〕

According to the present invention, it is possible to obtain an image effect similar to a mosaic fader with an extremely simple structure.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an example of the present invention, and FIGS. 2 to 5 are diagrams for explaining the same. (1) is a lens system, (2) is an imaging device, (3) is a sample and hold circuit, (4R) (4G) (4B) is a gain control amplifier, (5) is an encoder, (6) is a video tape recorder, (9) is a synchronization generating circuit, (11) is a trigger switch,
(12) is a fader circuit, (13) (15) is a switch,
(14) and (17) are oscillators, (16) is an inverter, (18) is a mono-multi, and (19) is an OR circuit.

Claims (1)

[Claims] 1. A fader signal generating means for generating a fader signal whose level is gradually changed in relation to a start or end signal, and a pulse which is activated by a horizontal synchronizing signal and whose period is changed according to the fader signal. A pulse signal forming means for forming a signal and a sample and hold means for sample-holding a baseband video signal by using the pulse signal are provided, and the sample and hold means horizontally images the video signal based on the pulse signal. An image effect device characterized in that sample holding is performed in a direction.