JPH0682268B2 - Image converter - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image conversion device that can be used for image shape conversion such as an image special effect device.

2. Description of the Related Art In recent years, various special effects have become possible due to advances in image processing technology, and many special effect devices have been announced. In these special effect devices, conversion scanning is performed not only for image data but also for addresses.

A conventional image conversion apparatus will be described below with reference to the drawings.

FIG. 3 shows a conventional image conversion device, 31 is a conversion address generation device, 32 is a pixel coordinate value on a new image plane, and 33 is
Is a point coordinate value on the original image plane, 34 is a coordinate correspondence memory, 35 is a read address control device, 36 is a write address control device,
37 is an image memory, 38 is a local reduction ratio of the original image, 9 is a reduction ratio memory, and 3a is a two-dimensional adaptive filter.

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

First, the conversion address generation device 31 determines a pixel coordinate value 32 on the new image plane according to the given three-dimensional geometric structure expression, coefficient, position, direction and viewpoint position, and screen position,
The point coordinate value 33 on the original image plane corresponding to the pixel coordinate value 32 on the new image plane and the local reduction rate 38 of the original image are output.
The coordinate correspondence memory 34 stores the point coordinate value 33 on the original image plane by using the pixel coordinate value 32 on the new image plane for address designation. The reduction ratio memory 39 stores the local reduction ratio 38 of the original image. The two-dimensional adaptive filter 3a has the above reduction rate memory.
High frequency components are removed while changing the characteristics of the local filter according to the contents of 39. The image memory 37 sequentially stores the original image from which the high-frequency component is removed by the two-dimensional adaptive filter under the control of the write address controller 36. The read address control device 35 generates the new image by reading the image data of the original image from the image memory 37 in accordance with the point coordinate values on the original image plane taken out from the coordinate correspondence memory 34 at the timing of the new image. For example, it is as described in Technical Report Vol.9, No.20, PPOE62-9 of the Television Society.

Problems to be Solved by the Invention However, there is a problem that the mapping shape generated by the above configuration cannot be recognized on a new image as a three-dimensional geometrical shape unless it is rotated / moved. Had.

In view of the above problems, it is an object of the present invention to provide an image conversion device capable of creating a high-impact effect image by adding a shadow to a mapping shape.

Means for Solving the Problems In order to solve the above problems, the image conversion device of the present invention is
This is configured by adding a brightness conversion unit capable of changing the brightness information of the corresponding pixel according to the pixel position coordinate value on the new image.

Effect The present invention can add a pseudo shadow by changing the luminance of the corresponding pixel according to the pixel position coordinate value on the new image with the above-described configuration, and can create an effect image with a large inact.

Example Normally, in order to add a shadow when the original image is mapped to a three-dimensional shape, the brightness information in the pixel information of the original image may be increased or decreased according to the orientation of the surface of the shape. In the present invention, the pixel position coordinate value on the new image is used as the increase / decrease parameter of the brightness information instead of using the above method, so that it is possible to obtain the shading effect by suppressing the increase in the addition of calculation to the necessary minimum. .

An image conversion apparatus according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a block diagram of an image conversion apparatus in a first embodiment of the present invention.
In FIG. 1, 1b is a brightness conversion unit, and the other parts are the same blocks as in FIG.

The operation of the image conversion apparatus configured as described above will be described below with reference to FIGS. 1 and 2.

First, the conversion address generation device 11 generates a pixel coordinate value 12 on the new image plane according to the given three-dimensional geometric structure expression, coefficient, position, direction and viewpoint position, and screen position,
The point coordinate value 13 on the original image plane corresponding to the pixel coordinate value 12 on the new image plane and the local reduction rate 18 of the original image are output.
The coordinate correspondence memory 14 stores the point coordinate value 13 on the original image plane by using the pixel coordinate value 12 on the new image plane for address designation. The reduction rate memory 19 stores the local reduction rate 18 of the original image. The two-dimensional adaptive filter 1a has the reduction ratio memory described above.
High frequency components are removed while changing the characteristics of the local filter according to the contents of 19. The image memory 17 sequentially stores the original image from which the high frequency components have been removed by the two-dimensional adaptive filter under the control of the write address controller 16. The read address control device 15 reads the image data of the original image from the image memory 17 according to the point coordinate values on the current image plane taken out from the coordinate correspondence memory 14 at the timing of the new image,
The brightness calculation unit 1b uses, for example, the coefficient Kx shown in FIG. 2 according to the new image coordinate value (x, y) used by the read address controller 15 to retrieve the read address from the coordinate correspondence memory.
(X) and Ky (y) are obtained, and the luminance Ys is calculated by the following equation using these coefficients.

Ys = Kx (x) * Ky (y) * Y The new image obtained by the above equation is a video with a pseudo shadow added according to the pixel position coordinate value on the new image.

EFFECTS OF THE INVENTION As described above, the present invention realizes an image conversion device that can add a pseudo shadow by providing a brightness conversion unit that changes brightness information according to pixel position coordinate values on a new image. Can be done.

[Brief description of drawings]

FIG. 1 is a block diagram of an image conversion apparatus according to an embodiment of the present invention, FIG. 2 is a graph of luminance conversion coefficients in an embodiment of the present invention, and FIG. 3 is a block diagram of a conventional image conversion apparatus. . 11 …… Conversion address generation device, 12 …… New image plane pixel coordinate value, 13 …… Original image plane point coordinate value, 14 …… Coordinate corresponding memory, 15 …… Read address control device, 16 …… Write address Control device, 17 ... Image memory, 18 ... Local reduction ratio of original image, 19 ... Reduction ratio memory, 1a ... Two-dimensional adaptive filter, 1b ... Luminance conversion unit, 21 ... New image plane Coordinate system, 22 ... Luminance conversion coefficient (x direction), 23 ... Luminance conversion coefficient (y direction), 31 ... Conversion address generation device, 32 ...
New image plane pixel coordinate value, 33 ... Original image plane point coordinate value, 34 ... Coordinate correspondence memory, 35 ... Read address control device, 36 ... Write address control device, 37 ... Image memory, 38 ... … Local reduction ratio of original image, 39… Reduction ratio memory, 3a… Two-dimensional adaptive filter.

Claims (1)

[Claims] 1. An image for generating a new image by using a read address calculated according to a given three-dimensional geometric structure expression, coefficient, position, direction and viewpoint position, and screen position for reading from an image memory. An image conversion device having a brightness conversion unit capable of changing the brightness of a corresponding pixel according to a pixel position coordinate value on a new image.