JPH0831982B2 - Scene change special effect device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scene change special effect device, and more particularly to a scene change special effect device for performing display control on a screen on which a broadcast video signal is displayed by switching from a screen based on the video signal to a screen based on another video signal. Regarding

[0002]

2. Description of the Related Art Generally, in a broadcast video, when switching scenes, not only switching but switching using a special effect is performed. For example, well-known wipes and dissolves are typical examples.

[0003]

The above scene switching according to the prior art is more effective than simply switching. However, at the time of changing scenes, the effect that the previous screen was dragged to the center and disappeared like ant hell did not exist, and this realization was expected.

The present invention is intended to solve the above problems,
Its purpose is to provide a scene change special effect device capable of creating an effect of changing to the next scene while the front screen seems to be dragged to the center like ant hell.

[0005]

In order to solve the above-mentioned problems, a scene change special effect device according to the present invention is arranged such that a screen on which a first video signal is displayed is changed from the first video signal to the second video signal.
Which is a scene change special effect device for performing display control by switching to the video signal of No. 1, which holds the first video signal and outputs data of each pixel forming the first video signal from a designated address. A memory and address generating means for cyclically outputting all addresses of the frame memory,
The address from the address generating means corresponding to each pixel on the first ellipse having the first diameter on the screen corresponds to each pixel on the second ellipse having the second diameter larger than this. Address conversion means for converting into an address; data reading means for reading data in the frame memory by the converted address converted by the address conversion means; and a value of the converted address of an address existing in the frame memory. selection outputs the data read from the frame memory when the value, the value of the converted address is output <br/>-out the second image signal to be the value of the address that does not exist in the frame memory Means for displaying the output of the selecting means on the screen according to the address from the address generating means.

[0006]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of a scene change special effect device according to the present invention. In the drawings, a scene change special effect device according to an embodiment of the present invention is
An image which has two input terminals 1 and 2 and one output terminal 9 and which is input to the input terminal 2 from a screen based on a video signal input to the input terminal 1 (hereinafter referred to as a first video signal) A state of switching to a screen by a signal (hereinafter, referred to as a second video signal) is derived to the output terminal.

Further, the scene change special effect device according to the present embodiment is constituted by a frame memory or the like, holds the first video signal, and outputs the data of the pixel forming the first video signal from the designated address. Memory unit 3 and a write address unit 4 for generating a write address of this memory unit 3
And a two-input signal synthesizing section (M / K; MIX KEYER) 8 for switching and controlling the output signal of the memory section 3 and the second video signal according to the value of the key signal (KEY). It is configured.

Furthermore, in the scene change special effect device according to the present embodiment, the controller unit 6 which cyclically outputs all the addresses of the memory unit 3 so as to scan the display screen horizontally and vertically, and the controller unit 6 Address is converted according to each parameter to be described later, and the address conversion unit 7 which sends out a key signal having a value corresponding to the value of the converted address and the address converted by the address conversion unit 7 are read. The address 5 includes a read address section 5 to be given to the memory section 3.

In this embodiment, in order to perform processing on an analog signal, an analog / digital conversion circuit (A / D) 10 for converting it into a digital signal,
11 is provided in the input stage, and a digital / analog conversion circuit (D / A) 12 for converting it into a digital signal again
Are provided in the output stage.

In such a configuration, the first video signal is
It is held in the memory unit 3 under the control of the write address unit 4. The output of the memory unit 3 and the second video signal are switching-controlled by the 2-input signal synthesizing unit 8 and transmitted. That is, the special effect of being pulled into the center like an ant hell is realized by changing the value of the key signal for designating the read address of the memory section 3 and controlling the switching of the combining section 8.

All addresses of the memory unit 3 are cyclically output from the controller unit 6 and sequentially input to the address conversion unit 7. The address conversion unit 7 performs address conversion so as to realize the above special effect. In order to realize such a special effect, the address conversion unit 7 performs address conversion so as to move data of an arbitrary elliptical pixel to a smaller elliptic pixel.

What is important here is that in order to make a large ellipse into a small ellipse for data, an address of a small ellipse is converted into an address of a large ellipse, and data of an address on a large ellipse is made small. This means that it must correspond to an elliptical address.

The principle of the address conversion will be described with reference to FIG. FIG. 2 is a conceptual diagram showing the principle of address translation in the address translation unit 7. The figure shows the case where the address corresponding to the pixel at the point (x1, y1) on the small ellipse displayed on the screen is converted into the address corresponding to the pixel at the point (x2, y2) on the large ellipse. There is.
The origins of the X-axis and the Y-axis in the figure are the centers of both ellipses.

(1) When a is Positive First, x2 = k · x1, y2 = k · y1 ... Then, the equation representing the ellipse passing through the point (x1, y1) can be expressed as (x1 ² / a ² ) + (y1 ² / b ² ) = 1. Assuming that the constant of proportionality between a and b is Y / X, the formula is (x1 ² / a ² ) + (y1 ² / (a ² Y ² / X ² ) =
{(Y1 ² X ² / Y ² ) + x1 ² } / a ² = 1. Therefore, a = {(y1 ² X ² / Y ² ) + x1 ² } ^1/2 ...

Similarly, the equation representing an ellipse passing through the point (x2, y2) is {(y2 ² X ² / Y ² ) + x2 ² } / (a + d) ² = 1
… It becomes a formula. Substituting the expression into the expression, {(k ² y1 ² X ² / Y ² ) + k ² x1 ² } / (a +
d) ² = {(y1 ² X ² / Y ² ) + x1 ² } k ² / (a
+ D) ² = 1. Therefore, a + d = k {(y1 ² X ² / Y ² ) + x1 ² } ^1/2 ...
Expressions are compared with each other, and k = [d + {(y1 ² X ² / Y ² ) + x1 ² } ^1/2 ] /
{(Y1 ² X ² / Y ² ) + x1 ² } ^1/2 = 1 + [d /
{(Y1 ² X ² / Y ² ) + x1 ² } ^1/2 ] ...

(2) When a is negative In this case as well, k = 1 + [d / {(y1 ² X ² / Y ² ) + x
1 ² } ^1/2 ].

(3) From the above (1) and (2), x2 = {1+ (d / M ^1/2 )} · x1 equation y2 = {1+ [d / M ^1/2 ]} · y1 equation Become. However, M = (y1 ² X ² / Y ² ) + x1 ² .

In the above equations, d is the point (x
1, y1) to the point (x2, y2), not
It is the amount of movement of the two ellipses including them in the X-axis direction. That is, changing the movement amount d changes the difference between the diameters of the two ellipses . The address conversion unit 7 is configured as shown in FIG. 3 in order to realize the address conversion based on the above expressions and expressions.

FIG. 3 is a block diagram showing an internal configuration example of the address conversion unit 7, and the same parts as those in FIGS. 1 and 2 are designated by the same reference numerals. In the figure, the address conversion unit 7 of this example includes multipliers 71 to 76, adders 77 and 78,
ROM 79 that calculates the square root (ROOT) of the input value and then outputs the reciprocal value (RECIPROCAL)
And registers 80 and 81.

The address conversion unit 7 also includes comparison circuits 82 and 83 for generating a key signal and an OR circuit 84.
It is configured to include.

In addition to the address (x1, y1) from the controller unit 6, the address conversion unit 7 also has X ² / Y ² , which is the square of the reciprocal of the proportional constant Y / X, the movement amount d, and the value. Xmax, which is the maximum value of x1 and y1 of the screen when "1" is input and the center point of the display screen is the origin
, Ymax have been entered.

In such a configuration, the address (x1, y
When 1) is input, x1, x1
The square of y1 is calculated. Then, the y1 ² which is the calculation result, the multiplier 73 is X ² / Y ² is multiplied. The result y1 ² X ² / Y ² and x1 are added up by the adder 77, and the result is M described above. This M is a ROM
It is input to 79 and 1 / M ^1/2 is output from the ROM 79.

1 / M ^1/2 output from the ROM 79 is
The amount of movement d is multiplied by the multiplier 74, and "1" is added by the adder 78 to obtain (d / M ^1/2 ) +1. Here, x1 is input and held in the register 80, and the multiplier 75 multiplies with (d / M ^1/2 ) +1 to obtain {(d / M ^1/2 ) +1} x1. Sent out. This is x2. On the other hand, y1 is input and held in the register 81, and the multiplier 76 multiplies with (d / M ^1/2 ) +1, and {(d / M ^1/2 ) +1} y1 is sent out. To be done. This is y2.

The result calculated as described above is the address (x2, y2) obtained by converting the address (x1, y1) into an address on a larger ellipse, which is input to the read address section 5. Then, the memory section 3 is read. At this time, since the address (x1, y1) is input to the display device (not shown), when viewed from the display device side, a larger elliptical data is written to the address (x1, y1). It seems to be there. Therefore, an image that is dragged to the center like an ant hell is displayed on the display screen according to the movement amount d.

By the way, according to the above processing, the address (x1, y1) on a certain ellipse is converted into the address (x2, y2) on a larger ellipse. (X2, y2) is the memory unit 3
The value may not exist in. The comparator circuits 82 and 83 and the OR circuit 84 detect this.

The maximum value xmax of x1 on the display screen is input to the comparison circuit 82, and when x2 becomes larger than xmax, the output becomes "1". Further, ymax, which is the maximum value of the display screen y1, is input to the comparison circuit 83, and when y2 becomes larger than ymax, its output becomes "1". Therefore, when one of the comparison results becomes "1", that is, when the converted address value overflows and becomes an address value that does not exist in the memory unit 3, the OR circuit 84 sends a key signal. become.

This key signal is used as a switching control signal 2
Since it is input to the input signal synthesis unit 8, x2 is xmax
When it is larger or y2 is larger than ymax, the second video signal is output instead of the output of the memory unit 3,
It will be displayed on the screen. Therefore, the greater the value of the movement amount d, the more frequently the key signal is transmitted. This means that the first video signal is gradually drawn to the center and disappears, and accordingly, the second video signal is displayed on the screen so that it gradually appears.

The above-described selective switching output control is performed in 2
It is the input signal synthesizer 8. In short, this synthesizing unit 8
The value of the address of the converted outputs the data read from the memory unit 3 when the value of the address in the memory unit 3, outputs a second image signal when a value of the address that does not exist in the memory section 3 To do.

Here, regarding the change control of the movement amount d,
It may be changed by a manual operation of an operator using a slide volume or the like. It may be changed automatically by using a stepping motor or the like. This movement amount d may be given from the controller unit 6.

Further, the above-mentioned xmax and ymax are determined according to the size of the screen of the display unit and given in advance. Thus, not only the screen of the current television broadcast but also the screen of various sizes such as high-definition broadcast can be supported. These xmax and ymax may be given from the controller unit 6.

Further, although the case where the effect of being sucked in an elliptical shape is obtained has been described above, if a = b and (X = Y) in FIG. 2, it is sucked in a circular shape. It is clear that the effect can be obtained. In this case, the value of X ² / Y ² in FIG. 3 may be set to “1”.
That is, if the value of X ² / Y ² is set appropriately, the effect of being sucked into various elliptical shapes can be obtained.

An example is shown in which the first video signal is gradually drawn into the center like an ant hell and disappears, and along with this, the second video signal is gradually displayed so as to appear on the screen. It is FIG. In the figure, when the movement amount d is 0, no key signal is sent out. Therefore, the first video signal stored and held in the memory unit 3 is directly output from the synthesis unit 8 and displayed on the screen. The screen 40 shows this state.

When the movement amount d is gradually increased from this state, the data corresponding to the central portion of the screen of the first video signal gradually disappears from the display screen. The screens 41 to 43 show this state.

Further, by increasing the movement amount d, all the values of the addresses x2 and y2 in the address conversion unit 7 are xmax,
When it becomes larger than ymax, the first video signal is not displayed on the display screen at all, and only the second video signal is displayed. The screen 44 shows this state.

In other words, the effect of pulling the center of the handkerchief downward from the lower side of the through hole can be obtained on the screen by placing the handkerchief on the plate member having the through hole in the central portion. is there. FIG. 5 conceptually shows this state.

By the way, according to the above equations and equations,
When both the values of y1 and x1 are “0”, that is, for the address of the center point of the screen, the values of y2 and x2 are ∞, and the data cannot be determined. To get the effect of being dragged to the center like ant hell,
Since it is better to display black at the pixel at the center of the screen, y1
When both x1 and x1 are "0", black may be forcibly displayed. In this case, a circuit for detecting y1 = x1 = 0,
A circuit for transmitting black video data according to the detection result may be provided at the output stage of the address conversion circuit, and those skilled in the art can easily configure these.

[0038]

As described above, according to the present invention, an address is converted into an elliptical shape, data is read out, and when the address value overflows, the next screen is output. This has the effect of being able to obtain the effect of being dragged into the center like ant hell.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating a configuration of a scene change special effect device according to an exemplary embodiment of the present invention.

FIG. 2 is a conceptual diagram showing the principle of address translation in an address translation unit 7 in FIG.

FIG. 3 is a block diagram showing an internal configuration example of an address conversion unit 7 in FIG.

FIG. 4 is a schematic diagram showing an example in which the first video signal is gradually dragged to the center like an ant hell and disappears, and the second video signal is gradually displayed on the screen so that the second video signal gradually appears. Is.

5 is a conceptual diagram showing a state of screen display by the scene change special effect device of FIG. 1. FIG.

[Explanation of symbols]

 3 memory section 4 write address section 5 read address section 6 controller section 7 address conversion section 8 2 input signal synthesis section

Claims (2)

[Claims] 1. A scene change special effect device for performing display control by switching from the first video signal to the second video signal on a screen on which the first video signal is displayed, held, a frame memory for outputting data of each pixel constituting the first video signal from the specified address, and the address generating means for outputting the entire address of the frame memory cyclically, first on the screen The diameter of 1
The address from the address generating means corresponding to each pixel on the first ellipse has a second diameter larger than the address.
That an address conversion means for converting the addresses corresponding to each pixel on a second ellipse, and reading data reading means data in said frame memory by the converted address after conversion by the address conversion unit, the converted When the value of the address is the value of the address existing in the frame memory, the data read from the frame memory is output, and the value of the converted address is the value of the address not existing in the frame memory. And a selection means for outputting the second video signal, and the output of the selection means is displayed on the screen according to the address from the address generation means. apparatus. 2. In response to an external command, the first diameter and the
2. The scene change special effect device according to claim 1, further comprising means for changing a difference from the second diameter .