JPS6265570A - Device for special effect of video - Google Patents

Abstract

PURPOSE:To obtain a small-scale and inexpensive device by realizing a mosaic picture plane using a one line memory and a sample and hold circuit. CONSTITUTION:A switching control pulse SWP becomes '1' at a horizontal section just after the completion of a vertical blanking period, and afterwards, it becomes '1' only at a horizontal section at every nH (n represents an integer and H a horizontal period). An input luminance signal is supplied to a CCD delay circuit 3 and after the completion of the first horizontal section, a switch circuit 2 is connected to an input terminal B and at the output terminal of the delay circuit 3, the luminance signal in the first horizontal section appears repeatedly during the period of nH and is sampled by a switch circuit 6, and is held by a capacitor 8, being outputted through an amplifier 9. A sampling pulse SHP is generated just after the completion of a horizontal blanking period, afterwards, being generated at every time period (t). At a picture plane 11, the mosaic picture made of mosaic pieces 12 painted with the first sampling value P having a length of (t) in the horizontal direction and a length of nH in the vertical direction appears.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a video special effects device that makes it possible to obtain mosaic images.

[Summary of the invention]

This invention simply realizes the video special effects of mosaic images, which conventionally required advanced digital technology, by using an l-line memory and a sampling and holding circuit.
Compared to conventional devices, it is possible to realize the same functions as conventional devices on a smaller scale and at a lower cost.

[Conventional technology]

A video special effect is known that changes a normal 11jlthi as shown in FIG. 6 into a mosaic screen consisting of a plurality of mosaic pieces d as shown in FIG.

Conventionally, when trying to obtain such a mosaic screen, 1
The video signal for one screen is converted into a digital signal and stored in memory, and for this stored video data for one screen, the data included in each one mosaic piece d is completely replaced with specific representative data therein. Then, create a mosaic piece consisting only of representative data, perform this work for all one screen direction, and then read out the data consisting of the plurality of mosaic pieces d from the memory, convert it from D/A, and create a video of the mosaic screen. I was trying to get a signal.

(Problems to be solved by the invention) In the case of the conventional device for obtaining the inner surface of a mosaic as described above, a digital frame memory and high-speed arithmetic processing were required, and Nishido's digital technology had to be used. It had become very expensive and large in size.

[Means for solving problems]

In this invention, a one-line memory having a capacity for one line of video signals and a sampling hold circuit +61 +71 +81 are provided.

[Effect]

In the memo January 3), the video signal of the first horizontal section of the n horizontal sections is written every n horizontal periods of the input video signal (n is an integer greater than or equal to 2 and less than or equal to the number of lines included in one field). At the same time, the video signal of this first one horizontal section is read out repeatedly for the n horizontal sections, and the read data is sampled and held in the sampling and holding circuit +61 +71181 by the sampling pulse SHP with a period shorter than one horizontal period. The hold signal is output to the output terminal (1o).

〔Example〕

The first FgJ represents one embodiment of the present invention, and this example is an example in which the input video signal is a black and white video signal.

That is, the luminance signal through the input terminal +11 is supplied to one input terminal A of the switch circuit (2). and,
The output of this switch circuit (2) is supplied to a one-horizontal period delay circuit (3) made of COD, for example, and the delayed output is sent to the other input terminal of the switch circuit (2). B is supplied.

On the other hand, a switching control pulse SWP is supplied to this switch circuit (2) through a terminal (5), and the switch circuit v
s(21) is switched to the input terminal A side only when this pulse SWP is 11''.

This switching control pulse SWP is, for example, the 21st!
This signal is formed from the blanking signal BLK shown in IA, and has a phase different from that shown in B in the same figure with respect to this signal BLK.

In other words, this pulse SWP is applied to one horizontal section (first line of the image) immediately after the vertical blanking period ends.
After that, this pulse SWP becomes l' I J for one horizontal period every nH (n is an integer greater than or equal to 2 and less than or equal to the number of lines included in one field, and H is the horizontal period).

Therefore, during the first line of the image, the switch circuit (2) is connected to the input terminal A side, and the input luminance signal is C.
It is supplied to the OD delay circuit (3). When this first horizontal section ends, the pulse SWP becomes 1-01, the switch circuit (2) is connected to the other input terminal B, and the luminance signal of the first horizontal section passes through the delay circuit (33). is repeatedly supplied to the delay circuit (3).This state continues for a period of nH, and eventually the output terminal of the delay circuit (3) is supplied with the signal of the first horizontal interval from the first horizontal interval to nH. The luminance signal appears repeatedly.

The gain control amplifier (4) is an amplifier for correcting a decrease in the level of the video signal caused by passing through the delay circuit (3). This amplifier can also be provided with a function of compensating for characteristic deterioration in the COD delay circuit (3).

Next, in the (n+1)Hth horizontal section, the pulse SW
Since P becomes "1" again, the switch circuit (2) is switched to the A side, and the luminance signal of this (n+1)H horizontal section is supplied to the delay circuit (3).

Then, from the (n+2)H to the 2nH, the pulse s
Since p is rOJ, during this period, the luminance signal of the (n+1)Hth horizontal section appears repeatedly at the output terminal of the delay circuit (3).

Thereafter, for each nH, the luminance signal of the first horizontal section of that nH period is 1! appears repeatedly at the output end of the extension circuit (3).

The output signal of this delay l path (3) is sent to the switch circuit (6).
is sampled by being turned on by the sampling pulse SHP from the terminal (7), and the sampled value is stored and held in the capacitor (8). Here, the sampling pulse SHP is formed, for example, from the horizontal blanking pulse HBLK as shown in FIG. 3A, and has a phase as shown in FIG. 3B with respect to this pulse HBLK.

That is, this pulse SHP is generated immediately after the horizontal blanking period ends, and thereafter at a time t (t is after IH).
Occurs with a period of

Therefore, in each horizontal interval, after the first image position is sampled in each line, it is sampled at time intervals of
It is held in the capacitor (8) during this period.

By the way, the output of the delay circuit (3) is that during the nH period, the video signal of the first horizontal line of that nH always appears (repeatedly), so in the end, as shown in FIG.
At this point, a signal is obtained at the capacitor (8) in which a mosaic image consisting of a plurality of mosaic pieces (12) with a horizontal length t and a vertical length nH appears, and this signal is transmitted to the amplifier. (9) to the output terminal (10).

In this case, one mosaic piece (12) is filled with the first sampled value in the horizontal direction t of the first line of nH in the vertical direction, indicated by point P in FIG.

In this example, since COD is used for the delay circuit (3), due to its frequency characteristics, the mosaic piece (12)
If the size of the image is increased, the color etc. may gradually change in the upper direction in the case of a color video signal, which will be described later, but this results in a blurred gradation-like effect.

The above example is for the black and white video signal No. 48, but in the case of a color video signal, it is necessary to configure it as shown in FIG.

In other words, a circuit (24
) (25) and (26) are provided, and the luminance signal Y through the input terminal (21) is connected to the circuit (24) of the example in FIG.
), the fη number YE is given special effects as described above, and the red and blue color difference signals R-Y and B-Y through the input terminals (22) and (23) are supplied to the circuit ( 25)
and (26) respectively, and the signals (RY) E and 1:J' (B-Y) with special effects as described above are supplied.
Let it be E. Then °c, (M No. (R-Y) E and (B-
Y)E are balanced modulation circuits (27) and (28) respectively
The balanced modulated signals are each supplied to a combining circuit (29) to be combined with the signal YE, and output to the output terminal (3).
0) special effects hl! A composite color video signal is obtained.

In the above manner, a mosaic image consisting of mosaic pieces (12) of nH length and width t can be obtained to improve the inside of the TV. You can change the The value of n and the value of t are determined by the switching control pulse SW.
P and the period of the sampling pulse SHP, it is possible to obtain a mosaic consisting of mosaic pieces of any size by simply changing the period of these pulses SWP and SHP.

In this case, to make the mosaic piece (12) square,
For NTSC signals, t/n = o, iex i
o-' (sec).

Note that if you continuously vary the values t and n while maintaining the ratio of the values t and n, you can use the fader to gradually increase the size of the mosaic piece or conversely make the mosaic piece gradually smaller.
Effects can be obtained. In this case, if t/n is set to the above value, a fader effect with a square mosaic piece can be obtained. In addition, if pulses SWP and SHP are generated during a period corresponding to a part of the screen rather than the entire screen, and the circuit shown in Figure 1 is bypassed during other periods, it is possible to create a mosaic in a part of the screen. It is also a notepad.

Note that in the above example, the CCD delay circuit was used as a one-line memory, so analog video signals can be handled as they are.

However, the present invention does not use this CCD delay circuit, but uses a normal one-line memory, and adds an I
It is also possible to write only H minutes and read it out. In this case, the 1-line memory may be an analog memory or a digital memory.

〔Effect of the invention〕

As described above, according to the present invention, a mosaic screen can be realized with a simple configuration using a one-line memory and a sampling and holding circuit. Therefore, the device is smaller and cheaper than conventional devices.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an example of the device of this invention, FIGS. 2 and 3 are diagrams for explaining the device, FIG. 4 is a diagram for explaining the mosaic screen, and FIG. 5 is a color video of this invention. The block diagrams shown in FIGS. 6 and 7 in the case of application to signals are diagrams for explaining a mosaic screen. (3) is an example of l-line memory.'This COD? ! extension circuit, (6) is a sampling switching circuit, (8)
is a hold capacitor. YE Circuit 24 CR-Y)E R-Y Figure 1 Balanced circuit Modulation Combined 25 (B-Y-ε 27 B-Y Figure 1 Balanced circuit 1 Figure 8 ta t) +1'.

Claims (1)

[Claims] It has a memory for one line and a sampling and holding circuit, and the memory stores data for each n horizontal period of the input video signal (n is an integer greater than or equal to 2 and less than or equal to the number of lines included in one field). The video signal of the first horizontal section is written, and the video signal of the first horizontal section is read out repeatedly for the n horizontal sections, and the read data is stored in the sampling and hold circuit for one horizontal section. A video special effects device in which sampling and holding is performed using a sampling pulse having a period shorter than the period, and the hold signal is derived to an output terminal.