JPH0344350B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image conversion device that can be used for image shape conversion in image special effects devices and the like.

BACKGROUND ART In recent years, advances in image processing technology have enabled various special effects, and many special effect devices have been announced. In these special effects devices, conversion operations are performed not only on image data but also on addresses.

A conventional image conversion device will be described below with reference to the drawings. FIG. 3 is a block diagram of a conventional image conversion device, in which 31 is a horizontal address calculator;
32 is a vertical address calculator, 33 is 31,3
2, a translation address generation device comprised of 3;
4 is a horizontal buffer memory, and 35 is an image memory.

The operation of the image conversion apparatus using the conventional conversion address generation apparatus configured as described above will be described below.

First, the horizontal address calculator 31 sequentially outputs horizontal conversion addresses in accordance with the given horizontal reduction and movement parameters. The vertical address calculator 32 sequentially outputs vertical conversion addresses in accordance with the applied vertical reduction and movement parameters. The horizontal and vertical conversion addresses are input to the horizontal buffer memory 34 and the vertical conversion address to the image memory 35 as outputs from the conversion address generation device 33, respectively. The horizontal buffer memory 34 writes the original image into the buffer memory in accordance with the horizontal conversion address inputted from the conversion address generation device 33, thereby creating and outputting an image that has been reduced and moved only in the horizontal direction. The image memory 35 writes the image reduced and moved only in the horizontal direction in the memory according to the vertical conversion address inputted from the conversion address generation device 33, thereby reducing and moving the image in the vertical direction, and converting the image in the horizontal and vertical directions. Create and output a new image that has been reduced and moved. For example, NEC technical report
As described in Vol. 37 No. 1/1984, pages 61-65.

Problems to be Solved by the Invention However, in the above configuration, since the horizontal conversion address and the vertical conversion address are handled independently, there is a problem that only reduction and movement conversion can be performed within a two-dimensional plane. It had

In view of the above-mentioned problems, the present invention associates original image coordinate values with coordinate values on a given three-dimensional geometric structure shape surface, and further performs perspective transformation to convert original image coordinate values to new image coordinate values. An object of the present invention is to provide an image conversion device that can create a correspondence table of , and create a new image from an original image according to the correspondence table.

Means for Solving the Problems In order to solve the above problems, the image conversion device of the present invention provides a three-dimensional geometric structure expression,
a conversion address generation device that outputs a pixel coordinate value on a new image plane and a coordinate value of a point on the original image plane corresponding to the pixel coordinate value on the new image plane according to the coefficient, position, direction, viewpoint position, and screen position; , a coordinate correspondence memory that stores the coordinate values of points on the original image plane for each pixel on the new image plane, an image memory that stores the original image, and a write address for sequentially writing the original image to the image memory. The image forming apparatus is composed of a control device and a read address control device that generates a new image by reading out the image memory in accordance with the coordinate values of points on the original image plane sequentially read out from the coordinate correspondence memory. .

Effect The present invention has the above-mentioned structure, and provides three
According to the dimensional geometric structure expression, coefficient, position, direction, viewpoint position, and screen position, a point coordinate value on the original image plane corresponding to the pixel coordinate value on the new image plane is generated, and a point coordinate value on the original image plane is generated. A new image is generated by controlling the reading of the original image written in the image memory according to the point coordinate values.

Embodiment An image conversion device according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows a conceptual diagram of an image conversion device according to an embodiment of the present invention. In Figure 2, 2
1 is the original image plane, 22 is the original triangular plate, 23 is the shape plane, 24 is the shape triangle plate, 25 is the new image plane, 26
is a viewpoint, 27 is a triangular plate on the new image plane, 28 is a pixel coordinate value on the new image plane, and 29 is a point coordinate value on the original image plane.

The concept of the image conversion device will be explained below with reference to FIG. The purpose of the image transformation device of the present invention is to obtain point coordinate values on the original image plane corresponding to each pixel coordinate value on the new image plane, and transform the original image according to the pixel coordinate values and the point coordinate values. , to obtain a new image. Here, the pixel coordinate value is an integer coordinate value assigned to each pixel.

First, shape calculations are performed on each vertex of the original triangular plate 22 on the original image plane 21, and the shape is converted into three-dimensional shape coordinates to obtain the shaped triangular plate 24. Further, by performing perspective transformation, the triangular plate 24 is projected onto the new image plane 25, and a triangular plate 27 on the new image plane is obtained. As described above, the original triangular plate 22 on the original image plane 21 has been associated with the triangular plate 27 on the new image plane. Next, in order to obtain each pixel coordinate value on the new image plane and the point coordinate value on the original image plane corresponding to the above pixel coordinate value, the pixel coordinate value 28 on the new image plane in the triangular plate 27 on the new image plane is calculated. Extract. Furthermore, in accordance with the rule of associating each point coordinate value inside the triangular plate 27 on the new image plane with the point coordinate value inside the original triangular plate 22 on a one-to-one basis, the original image corresponding to the pixel coordinate value 28 on the new image plane is A point coordinate value 29 on the image plane is obtained.

Image transformation can be performed by reading and writing from and to the image memory according to the pixel coordinate values 28 on the new image plane and the point coordinate values 29 on the original image plane.

FIG. 1 shows an image conversion device in one embodiment of the present invention. In FIG. 1, 11 is a conversion address generation device, 12 is a pixel coordinate value on a new image plane, 13 is a point coordinate value on an original image plane, 14 is a coordinate correspondence memory, 15 is a read address control device, 1
6 is a write address control device, and 17 is an image memory.

The operation of the image conversion apparatus configured as described above will be described below with reference to FIG. 1.

First, the conversion address generation device 11 generates a pixel coordinate value 12 on the new image plane and a pixel coordinate value 12 on the new image plane according to the given three-dimensional geometric structure expression, coefficient, position, direction, viewpoint position, and screen position. A point coordinate value 13 on the original image plane corresponding to the pixel coordinate value 12 is output. The coordinate correspondence memory 14 stores the point coordinate value 13 on the original image plane using the pixel coordinate value 12 on the new image plane for address designation. Image memory 1
7 sequentially stores the original images under the control of the write address control device 16. The read address control device 15 generates a new image by reading the image data of the original image from the image memory 17 according to the coordinate values of the points on the original image plane taken out from the coordinate corresponding memory 14 in accordance with the timing of the new image. .

As described above, according to this embodiment, by using the configuration shown in FIG.
Correspond to the coordinate values on the shape surface of the dimensional geometric structure,
Furthermore, by performing perspective transformation, a correspondence table of original image coordinate values to new image coordinate values is created, and a new image can be created from the original image according to the correspondence table.

Effects of the Invention As described above, the present invention is configured by a conversion address generation device, a coordinate corresponding memory, an image memory, a write address control device, and a read address control device, and thereby enables a given three-dimensional geometry. A new image can be obtained by deforming the original image according to the shape of the scientific structure, and the functions of the special effects device can be greatly expanded.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an image conversion device according to an embodiment of the present invention, FIG. 2 is a conceptual diagram of an image conversion device according to an embodiment of the present invention, and FIG. 3 is a block diagram of a conventional image conversion device. . 11... Conversion address generation device, 12... Pixel coordinate value on new image plane, 13... Coordinate value of point on original image plane, 14... Coordinate correspondence memory, 15... Read address control device, 17... Image memory .

Claims (1)

[Claims] 1 According to the given three-dimensional geometric structure expression, coefficient, position, direction, viewpoint position, and screen position, pixel coordinate values on the new image plane and the original image corresponding to the pixel coordinate values on the new image plane a conversion address generation device that outputs coordinate values of a point on a plane; a coordinate correspondence memory that stores coordinate values of a point on a plane of the original image for each pixel on a new image plane; an image memory that stores the original image; A write address control device for sequentially writing original images to the image memory, and generating a new image by reading the image memory according to the coordinate values of points on the plane of the original image sequentially read from the coordinate corresponding memory. An image conversion device comprising: a read address control device.