JPH04227172A - Television special effect generator - Google Patents

Abstract

PURPOSE:To obtain a special effect on an image like a wave pattern by generating a concentric circular effect centering an arbitrary point. CONSTITUTION:Distance from the arbitrary point on the image is calculated by adders 1, 2, and 7, registers 3, 4, multipliers 5, 6, and a ROM 8 in which an arithmetic table is stored, and a prescribed function is generated corresponding to the distance by a ROM 9 in which the arithmetic table is stored, and a readout address value is modified by the function.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television special effect generating apparatus, and more particularly to a television special effect generating apparatus suitable for a digital television system.

0002

2. Description of the Related Art For example, in a digital television special effect generating device that enables three-dimensional image effects, a television signal stored in a digital memory is read out and output in the form of a digital signal. By changing the address read from time to time, special effects such as three-dimensional image rotation and page turns are generated.

[0003] Conventional special effect techniques include those that generate nonlinear effects based on the distance from an arbitrary straight line, such as the page turn effect that changes the image as if turning a page.

0004

[Problems to be Solved by the Invention] However, in conventional television special effect generating devices, it is difficult to generate linear effects such as three-dimensional rotation, and it is difficult to generate effects based on arbitrary straight lines such as page turns. Although it was possible to generate a non-linear effect, for example, it was not possible to generate an effect such as ripples spreading across an image.

[0005] The present invention has been made in view of such problems, and it is possible to generate a concentric circular effect centered on an arbitrary point to obtain a special effect such as ripples on an image. The purpose of the present invention is to provide a television special effect generating device that provides the following effects.

[0006]

[Means for Solving the Problems] A television special effect generating device according to the present invention is a television special effect generating device that generates special effects by changing the readout address when reading and outputting a television signal stored in a memory. The special effect generating device is characterized in that it is provided with an address control means that changes a read address value according to the distance from an arbitrary point on an image, and generates a nonlinear effect concentrically.

[0007]

[Operation] In the television special effect generating device of the present invention, since the readout address value is changed according to the distance from an arbitrary point on the image, a concentric special effect can be generated.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

First, the principle of the present invention will be explained.

For example, when reading out a television signal stored in a digital memory in the form of a digital signal, special effects such as three-dimensional rotation and page turns can be generated by changing the readout address.

The television special effect generating device of the present invention obtains the above-mentioned effects by further changing the read address.

That is, let the coordinates of the raster of the television image data be x, y, and the address of the memory to read out be x, y.
Then, addresses X and Y that generally cause three-dimensional rotation of an image are expressed by the following equations 1 and 2.

[0013]

[Math. 1] X=(ax+by+c)/(px+qy+k)

[0014]

[Math. 2] Y=(dx+ey+f)/(px+qy+k)
Here, a, b, c, d, e, f, p, q, and k are coefficients and are constant values for one screen.

In the present invention, according to the above-mentioned formulas 1 and 2,
Further modulation is applied based on the obtained addresses X and Y. As shown in Figures 2 and 3, points X0, Y0
The distance D between points X1 and Y1 when the center is , is expressed by the following equation.

[0016]

[Equation 3] Further, if a function that changes according to the distance D is f(D), the points X1 and Y1 are further changed by the distance f(D) from the points X0 and Y0. That is, it is converted into points X' and Y'. Since cosθ=(X1-X0)/D,

00
17]

[Math 4] Similarly, since sinθ=(Y1-Y0)/D,

[
0018

[Math 5] becomes.

In this way, for example, if f(D) is a trigonometric function, an image effect such as concentric ripples as shown in FIG. 2 can be obtained.

FIG. 1 shows a specific configuration of a main part of a television special effect generating apparatus according to an embodiment of the present invention.

The circuit of FIG. 1 includes adders 1, 2, 7, 16,
17, registers 3, 4, multipliers 5, 6, 12, 13, ROM (read only memory) in which calculation tables are stored
8, 9, and delay means 10, 11, 14, and 15.

In FIG. 1, inputs X1 and Y1 are subtracted by X0 and Y0 by adders 1 and 2, respectively. That is, adders 1 and 2 are used here as subtracters. X0 and Y0 are the values of the X and Y coordinates of the center points of the concentric circles stored in registers 3 and 4 in this case. X and Y coordinates of the center points of these concentric circles
0 is input via a man-machine interface, that is, by an input operation by an operator, is processed by a CPU (central processing unit) not shown, and is stored in register 3.
and 4. X1− obtained in this way
X0 and Y1-Y0 are each multiplier 5 to take the square.
and 6. After taking the square in multipliers 5 and 6, both (X1-X0)2 and (Y1-Y0)2 are added by an adder 7, and then supplied to a ROM 8 which functions as a square root calculator. A square root table is written in advance in the ROM 8, and the square root of the input data is determined by referring to the square root table according to the input data. The calculation result by this ROM8 is the point (X
1, Y1) from the point (X0, Y0).

The determined distance D is led to the ROM 9, which functions as a function generator. For example, a function table such as trigonometric functions is written in advance in the ROM 9, and by referring to the function table according to the input data, the result of a predetermined function operation on the input data can be obtained. This R.O.
M9 calculation result output and delay means 10 and 1 such as a delay line
derived X0-X1 and Y0-Y given through 1
1 are multiplied by multipliers 12 and 13, respectively, to obtain the X component and Y component of the modulation component. These X and Y components and X1 and Y1 whose delays have been compensated by delay means 14 and 15 are added by adders 16 and 17, respectively, to obtain final read addresses X' and Y'.

By using the read addresses X' and Y' thus obtained, a special effect of concentric modulation can be obtained.

The present invention is not limited to the above-described embodiments, but can be implemented in various ways, such as by combining a concentric circle effect with a page turn effect on a straight line to obtain a more complex effect.

[0026]

As described above, according to the present invention, a television special system that can change the readout address value according to the distance from an arbitrary point on the image and generate a concentric special effect. An effect generating device can be provided.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a conceptual diagram for explaining the principle of the present invention.

FIG. 3 is a diagram for explaining the principle of the present invention.

[Explanation of symbols]

1, 2, 7, 16, 17; adder 5, 6, 12, 13; multiplier 10, 11, 14, 15; delay device 8; ROM for square root 9; ROM for function generation

Claims (2)

[Claims] Claim 1: A television special effect generation device that generates a special effect by changing the readout address when reading and outputting a television signal stored in a memory, wherein 1. A television special effect generating device, comprising an address control means for changing a read address value accordingly, and generating a nonlinear effect concentrically. 2. The address control means includes distance calculation means for calculating a distance from an arbitrary point on the image, and generates a predetermined function according to the distance from the arbitrary point calculated by the distance calculation means. 2. The television special effect generating apparatus according to claim 1, further comprising a function generating means and an address modifying means for modifying the read address value by the function obtained by the function generating means.