JPS6325682A - Simulated field of view generator - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to adding a complex pattern to an image of a simulated visual field generating device.

[Summary of the invention]

Objects displayed in a computer-generated simulated visual field device are simulated using triangular or square planes.

The images displayed are flat and lack a sense of reality. To solve this drawback, we applied brightness modulation to the plane.

By adding patterns such as one thousand-sided trap grass, waves, clouds, etc., it is possible to generate a more realistic Arokyo pseudo-visual field.

[Conventional technology]

In the past, there was no easy way to add perspective-converted brightness modulation to a flat surface, resulting in an unrealistic image that looked like a flat mosaic.

[Problem that the invention seeks to solve]

The present invention solves these conventional problems.

The aim is to generate a more realistic simulated view by determining the brightness of each point on the screen by inverse coordinate transformation (determining the position of each point on the screen in the earth coordinate system) and weighting it on a plane. .

[Means for solving problems]

FIG. 1 is a block diagram showing the overall groove structure of the present invention.

In the figure, computer 1. The plane generating circuit 2° CRT 6 is a conventional simulated visual field device. The present invention adds this to the X inverse coordinate conversion circuit 3-1. Y inverse mark conversion circuit 3-2. A texture pattern generation circuit/12 multiplier 5 is added.

[Effect]

To explain its operation, the computer 1 calculates parameters for coordinate transformation and perspective transformation from the position of the viewpoint coordinates and the rotation angle of the viewpoint coordinate system, and calculates parameters for coordinate transformation and perspective transformation, and calculates parameters for coordinate transformation and perspective transformation. Transfer to -2. Plane generation circuit 2
It has a function of perspectively transforming a plane defined in the earth coordinate system onto a window and converting it into a video signal that can be displayed on a CRT. The inverse coordinate conversion circuits 3-1 and 3-2 are circuits that perform calculations to convert the coordinates of each point on the window into the X and Y positions of the earth coordinate system, and the earth coordinates (X,
Y) Find the brightness modulation degree αT of each point on the earth coordinates stored in the texture pattern generation circuit 4. The multiplier 5 modulates the video signal Vs generated by the plane generation circuit 2 with luminance modulation αT, thereby adding a pattern to the plane.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

Registers 301 to 308 store parameters 7 and 7 for obtaining inverse coordinate transformation. 31] and 312 are counters that count the XS and Ys coordinates of the window shown in FIG. 3 in synchronization with the scanning line. 321 to 326 are multipliers. 331-3
35 is an adder, and 341 is a memory for calculating the reciprocal of B, 1/B. A memory 400 stores texture patterns. 410 is a D/A converter.

500 is a multiplier for modulating the plane.

This operation will be explained below. Calculator 1 generates a transformation matrix A for inverse coordinate transformation for each TV frame.
132 people 2, A13・K, A31, A32
, A33·K and viewpoint altitude Z. The X coordinate and value of the viewpoint are sent.

These data are stored in register 301 during the blanking period.
~308. When the coordinate system of the window is as shown in FIG. 3, the counter 311 counts up in units of picture elements of each scanning line, and the counter 312 counts up in synchronization with the horizontal synchronizing signal. Square multipliers 321 to 326 and adders 331 to 335 perform the calculation of equation 2 (1) using the values of these registers and counters.

This is what we seek.

Equation (2) is also calculated for the YIIV mark using the same configuration as for X.

Memo 1J400 stores in advance the brightness modulation degree αT for the earth coordinates (X, Y), and the window (Xs +
Find the earth coordinates (X, Y) for ``s''.

If the memo IJ 400 is read using this address, the luminance modulation degree αT of each picture element can be determined. By converting this luminance modulation degree αT into an analog signal with a D/A converter 410 and then multiplying it by the conventional plane luminance Vs with a square multiplier 500,
It is possible to display a pattern with brightness modulation.

〔Effect of the invention〕

According to the present invention, by inversely converting points on nine screens into earth coordinates, it is possible to easily display a pattern of brightness modulation that has been perspectively transformed.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the overall configuration of the present invention. FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. 3 is an explanatory diagram of a coordinate system.

Claims (1)

[Scope of Claims] An arithmetic unit that performs inverse perspective transformation from the coordinate values of a window to a point in the earth coordinate system, and a memory for determining the degree of brightness modulation of the point in the earth coordinate system from the coordinate values determined by the arithmetic unit. and a multiplier that modulates the brightness of the value from the memory, and outputs a superimposed brightness-modulated pattern.