JPH0746463A - Picture effect device - Google Patents

Abstract

PURPOSE:To generate a diversified 3-dimension special effect pictures when a visual point is changed in many ways without provision of a large number of functions. CONSTITUTION:An input picture D1 is sequentially written in a picture frame memory 2 and read depending on read addresses Ax, Ay generated by a read address generating circuit 1 to generate a diversified 3-dimensional special effect pictures D2. An X coordinate generating section 11 and a Y coordinate generating section 12 output a coordinate (x, y) of each picture element of an input picture. A distance calculation section 13 calculates a distance (d) between a straight line set optionally on the input picture and each picture element of the input picture. A Z coordinate setting section 14 sets a coordinate (z) to shift the input picture in the Z axis direction of a 3-dimension logic address space. A mapping processing section 15 observes a point P of a coordinate (x, y, z) from a visual point Q set to a 3-dimension logic address space and applies mapping processing to the space into a 2-dimension logic address space thereby generating the read addresses Ax, Ay.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image effect device, and more particularly, to an image effect device which gives a three-dimensional special effect.

[0002]

2. Description of the Related Art Generally, in an image effect device, image data is sequentially written into an image frame memory to be stored therein, and the image data stored in the image frame memory is read out by controlling a read address so as to perform various special operations. The effect image is being generated. A conventional image effect device, for example, as disclosed in Japanese Examined Patent Publication No. 5-17747, when a paper placed on a plane is rolled along a cylinder, a three-dimensional image is rolled. A distance between a straight line for specifying a surface and each pixel is calculated, the distance is input to a preset function for performing a predetermined mapping, an output value is obtained, and a read address is generated.

[0003]

However, in the above-mentioned conventional image effect apparatus, the function for performing the mapping for generating the read address is set according to the special effect image to be generated. That is, in order to generate a three-dimensional image in which the paper is rolled along a cylinder, a specific function that achieves such an effect is required, and the viewpoint in this case is limited. Therefore, in the case of generating a three-dimensional special effect image when the viewpoint is changed variously, it is necessary to prepare a large number of functions for mapping, which causes a problem of complication.

It is an object of the present invention to provide an image effect apparatus capable of generating various three-dimensional special effect images when the viewpoint is changed variously without preparing a large number of functions.

[0005]

The image effect device of the present invention is an image effect device for generating a special effect image by storing an input image in an image frame memory and reading it according to a read address. An X, Y coordinate generator for outputting the coordinates (x, y) of the X and Y axes of each pixel when the input image is set on the X, Y plane of the three-dimensional logical address space having the Z and Z axes. A straight line coefficient generation unit that outputs a coefficient of a straight line that is arbitrarily set on the input image, and a distance calculation that calculates a distance d between the straight line set on the input image and each pixel of the input image by the straight line coefficient And a Z coordinate value setting unit that sets a coordinate value z for displacing each pixel in the Z axis direction of the three-dimensional logical address space.
A viewpoint coordinate generation unit for outputting coordinates of a viewpoint arbitrarily set in the dimensional logical address space, and coordinates of the three-dimensional logical address space indicated by outputs of the X and Y coordinate generation units and outputs of the Z coordinate value setting unit. The point (x, y, z) is
A mapping processing unit for observing from the viewpoint indicated by the coordinates of the viewpoint and mapping processing in a two-dimensional logical address space to generate the read address. Further, the Z coordinate value setting unit is
The coordinate value z is calculated based on a preset function having the distance d as a variable.

[0006]

The present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. The input image D1 is sequentially written in the image frame memory 2 and read in accordance with the read addresses Ax and Ay generated by the read address generation circuit 1 to generate various three-dimensional special effect images D2.

Here, the read address generating circuit 1 arbitrarily sets on the input image an X coordinate generating section 11 and a Y coordinate generating section 12 for outputting the coordinates (x, y) of each pixel of the input image D1. Linear coefficient generator 16 for outputting linear coefficients
And a distance calculation unit 13 that calculates a distance d between each pixel and a straight line set on the input image, and a Z coordinate value setting that sets a coordinate value z that displaces the input image in the Z axis direction of the three-dimensional logical address space. And a viewpoint coordinate generation unit 17 for outputting coordinates of a viewpoint arbitrarily set in the three-dimensional logical address space.
From the viewpoint set in the dimensional logical address space, coordinates (x,
and a mapping processor 15 for observing points (y, z) and mapping processing in a two-dimensional logical address space to generate read addresses Ax, Ay.

Next, the operation will be described with reference to a specific example.

Assuming a three-dimensional logical address space consisting of X, Y and Z axes, an input image is set on the X and Y axis plane.
As shown in FIG. 2, the distance calculation unit 13 causes each pixel of the input image and an arbitrary straight line L: aX + bY set on the input image.
Calculate the distance d with + c = 0. Here, the shortest distance from the coordinates (x, y) of each pixel to the straight line L is calculated. For example, the distances to the pixels P1, P2, P3 are d1, d
2, d3. The coefficients a, b, and c of the straight line L are generated by the straight line coefficient generating unit 16, and the straight line L serves as a reference line of the special effect image.

The Z coordinate value setting unit 14 sets the coordinate value z for displacing the pixel of the input image in the Z axis direction of the three-dimensional logical address space according to the distance d output by the distance calculation unit 13. In this case, the function z = f with the distance d as a variable
The value of z is calculated from (d).

This function is calculated by, for example, z = h + h.cos
When (d) (where h is a constant) is plotted in a graph with d as the horizontal axis and z as the vertical axis, the result is as shown in FIG. Therefore, if the point of coordinates (x, y, z) is displayed in the three-dimensional logical address space consisting of the X, Y, and Z axes, as shown in FIG. 4, in the Z axis direction according to the distance from the straight line L. It becomes a wavy image surface that fluctuates up and down. The coordinates (x, y, z) of this wavy image plane are input to the mapping processing unit 15. In addition,
By preparing various functions z = f (d), the image surface can be changed into various shapes.

The mapping processor 15 coordinates data (Xq, Yq, Z) of the viewpoint Q set in the three-dimensional logical address space.
q) from the viewpoint coordinate generation unit 17, and from the viewpoint Q (Xq, Yq, Zq) shown in FIG. 4, a point P (x, y,
z) is observed and mapped into a two-dimensional logical address space, and read addresses Ax and Ay are output. Image data is read from the image frame memory 2 by the read addresses Ax and Ay. Here, the coordinate data (Xq, Yq,
By changing Zq), it is possible to generate a three-dimensional special effect image when the viewpoint is variously changed. Note that such mapping processing can be executed by well-known arithmetic processing such as computer graphics.

[0014]

As described above, according to the present invention,
Assuming a three-dimensional logical address space consisting of X, Y, and Z axes, the input image is set on the X, Y axis plane, and the coordinates (x, y) of each pixel of the input image and the input image are arbitrarily set. The distance d from the straight line is calculated, and each pixel is Z-scaled according to this distance d.
By setting the coordinate value z to be displaced in the axial direction, observing the coordinates (x, y, z) from an arbitrarily designated viewpoint, performing mapping processing in the two-dimensional logical address space, and generating a read address, various Various three-dimensional special effect images when changing the viewpoint can be generated without preparing a large number of functions.

If the coordinate value z is set using a function having the distance d as a variable, various special effects images can be easily generated by preparing various functions. it can.

[Brief description of drawings]

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

2 is a straight line L calculated by a distance calculation unit 13 shown in FIG.
It is a figure which shows the distance d between a pixel and a pixel.

3 is a diagram showing an example of a function for a Z coordinate value setting unit 14 shown in FIG. 1 to calculate a coordinate value z.

4 is a diagram showing an example of a point P and a viewpoint Q on the image plane of a three-dimensional logical address space set in the mapping processing section 15 shown in FIG.

[Explanation of symbols]

 1 Read Address Generation Circuit 2 Image Frame Memory 11 X Coordinate Generation Section 12 Y Coordinate Generation Section 13 Distance Calculation Section 14 Z Coordinate Value Setting Section 15 Mapping Processing Section 16 Linear Coefficient Generation Section 17 View Point Coordinate Generation Section Ax, Ay Read Address

Claims (2)

[Claims] 1. An image effect device for generating a special effect image by storing an input image in an image frame memory and reading it according to a read address, wherein X of a three-dimensional logical address space having X, Y and Z axes. , Y
An X, Y coordinate generation unit that outputs the coordinates (x, y) of the X and Y axes of each pixel when the input image is set on a plane, and a linear coefficient that is arbitrarily set on the input image are output. A straight line coefficient generation unit, a distance calculation unit that calculates a distance d between a straight line set on the input image and each pixel of the input image according to the coefficient of the straight line, and in the Z-axis direction of the three-dimensional logical address space. A Z coordinate value setting unit that sets a coordinate value z for displacing each pixel, a viewpoint coordinate generation unit that outputs the coordinates of a viewpoint that is arbitrarily set in the three-dimensional logical address space, and an X, Y coordinate generation unit. The point of coordinates (x, y, z) in the three-dimensional logical address space indicated by the output and the output of the Z coordinate value setting unit is observed from the viewpoint indicated by the coordinates of the viewpoint, and mapped to the two-dimensional logical address space. The read address is processed. Image effect device, characterized in that it comprises a mapping unit for generating a. 2. The image effect apparatus according to claim 1, wherein the Z coordinate value setting unit calculates the coordinate value z based on a preset function having the distance d as a variable.