JP2756128B2 - Display system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] The present invention relates to a display system that changes a line of sight of a three-dimensional display image by variously changing the line of sight, and makes it easy to visually grasp a desired input line of sight. In a display system for displaying a three-dimensional image viewed from a specified line-of-sight direction for the purpose of prompt inputting, the display system displays the three-dimensional image together with a plane on which all coordinates of a spherical surface are developed, and a latitude line. Plane display means for displaying a plane provided with and a meridian; gaze direction input means for inputting a gaze direction from the plane; and display means for displaying the three-dimensional image viewed from the gaze direction based on the gaze direction information. And.

[Industrial applications]

The present invention relates to a display system that changes a line-of-sight direction to display a three-dimensional display image displayed on a display screen by changing the line-of-sight direction in various ways.

[Conventional technology]

In the field of three-dimensional display image processing, a three-dimensional display image such as a three-dimensional object or a three-dimensional figure displayed on a screen is displayed while changing its viewing direction in various ways.

Conventionally, when changing the viewing direction of a three-dimensional display image,
Angle parameters for specifying the line of sight, for example, longitude α and latitude δ, are numerically input, and three-dimensional coordinate conversion is performed using the angle parameters to convert and display a three-dimensional display image in the line of sight.

[Problems to be solved by the invention]

In the conventional method of changing the line-of-sight direction of a three-dimensional display image, the angle parameter for specifying the line-of-sight direction is numerically input as described above.

In this conventional method, it is generally difficult to grasp the relationship between the input numerical value of the angle parameter and the actual gaze direction in an image. For this reason, it is easy to input an incorrect numerical value, and even if there is an error in the input, it is not found until after the image conversion processing, so that it takes time to find the error, and it is difficult to find the input error from the display image after the conversion. There were also problems such as less cases.

The present invention makes it easy to visually grasp a desired input line-of-sight direction when changing the line-of-sight direction of a three-dimensional display image, to easily find a mistake in input, and to accurately and accurately input a line-of-sight direction.
It is an object of the present invention to provide a display system that changes the line-of-sight direction of a three-dimensional display image improved so that it can be performed easily and quickly.

[Means for solving the problem]

Means adopted by the present invention to solve the above-mentioned problem will be described with reference to the principle diagram of FIG.

In FIG. 1, reference numeral 11 denotes a display screen, and 111 denotes a three-dimensional display image displayed thereon. Reference numeral 112 denotes a coordinate screen in which all the coordinates of the latitude and longitude lines of the spherical surface are developed on a plane.
Is displayed using a part of the line, and the gaze direction is input. FIG. 1 (A) shows the display screen before the gaze direction is changed, and FIG. 1 (B) shows the display screen after the gaze direction is changed.

The present invention uses the coordinate screen 112 displayed on a part of the display screen 11 to change the line-of-sight direction of a three-dimensional display image, and is configured as follows.

A display system for displaying a three-dimensional image viewed from a specified line-of-sight direction, wherein the three-dimensional image is displayed, and a flat surface on which all coordinates of a spherical surface are developed, and a plane provided with parallels and meridians is displayed. And gaze direction input means for inputting a gaze direction from the plane, and display means for displaying the three-dimensional image viewed from the gaze direction based on the gaze direction information.

[Action]

A three-dimensional display image 111 is displayed on the display screen 11 as shown in FIG. 1 (A), and a coordinate screen 112 for inputting a line-of-sight direction is displayed on a part of the display image 111 to enable attention. . As the coordinate screen 112, for example, a coordinate screen in which all the coordinates of the latitude and longitude lines of a spherical surface are developed on a plane as shown in the figure is used in order to enable input of the gaze direction in all directions. It is needless to say that the coordinate screen 112 can be displayed in an area other than the area shown in FIG.

A position (A) corresponding to the desired line-of-sight direction on the coordinate screen 112
When a gaze direction is input by, for example, applying an attention to a cursor (indicated by P) with the cursor, gaze direction information is obtained based on the coordinate information of the attention position AP. This is explained in the examples section).

By performing three-dimensional coordinate conversion of the currently displayed three-dimensional display image 111 based on the line-of-sight method information, a three-dimensional display image changed to a desired line-of-sight direction is displayed as shown in FIG. The screen is converted and displayed on the screen 11.

As described above, since the coordinate screen is displayed on a part of the display screen 11 and the line of sight of the three-dimensional display image is input on the coordinate screen, the input line of sight can be easily recognized. it can.

This makes it possible to easily detect a line-of-sight direction input error at the time of input, and to perform a line-of-sight direction input accurately, easily and quickly, and efficiently perform a three-dimensional display image display process in which the line-of-sight direction is changed. be able to.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. FIG. 2 is an explanatory view of a configuration of an apparatus for implementing an embodiment of the present invention, FIG. 3 is an explanatory view of various maps used in the embodiment of the present invention, and FIG. 4 is a three-dimensional view of the embodiment. It is an explanatory view of a coordinate conversion process.

(A) Configuration of Implementation Device In FIG. 2, reference numeral 10 denotes a graphic display device, and its display screen 11, three-dimensional display image 111, coordinate screen 11
2 is as described in FIG.

Reference numeral 12 denotes an input position coordinate generating means, which includes an input device 121 such as a joystick, a mouse, and a light pen.
The gaze direction is input by a cursor (indicated by 113), and the input position, that is, the X of the attention position AP is input.
And the Y coordinate.

Reference numeral 13 denotes a gaze direction information calculation means, which is used to calculate the attention position AP.
This gaze direction information is calculated from the X and Y coordinates.

In this embodiment, the longitude α and the latitude δ of the map corresponding to the spherical coordinates θ and φ are used as the line-of-sight direction information. The latitude and longitude (α, δ) corresponding to the coordinates (X, Y) of each attention position AP are calculated in advance and stored in a table (hereinafter, referred to as a conversion table 131). Therefore, given the coordinates (X, Y) of the attention position AP, the corresponding latitude and longitude (α, δ) can be immediately obtained by referring to the conversion table 131.

On the coordinate screen 112, meridians and parallels are displayed,
The desired line-of-sight direction is easily and visually easily input by the cursor 113.

Reference numeral 14 denotes a coordinate conversion unit that performs a three-dimensional coordinate conversion process of a three-dimensional display image based on the line-of-sight direction information obtained by the line-of-sight direction information calculation unit 13, that is, longitude and latitude (α, δ).

Reference numeral 15 denotes an image creating unit that performs processing for creating image data of the three-dimensional display image 111 and the coordinate screen 112.

16 is a display control means, a graphic display device.
The graphic display control of the three-dimensional display image 111, the coordinate screen 112, the cursor 113, and the like in 10 is performed.

FIG. 3 shows a specific example of a coordinate screen 112 displayed on the display screen 11, and shows maps (A) to (C) representing coordinates of various spherical surfaces in order to enable input of sight lines in all directions.
(C) is illustrated.

FIG. 2A is a spherical coordinate map created by the equal cylinder cylindrical projection (or the square grid projection). It is also used as a projection of the world map, and the latitude and longitude are drawn at equal intervals. X, Y coordinates and longitude α and latitude δ on the map (attention position AP)
Is given by the following equation (1).

 X = aα + b, Y = cδ + d or α = a′X + b ′, δ = c′Y + d ′ (1) where a, a ′, b, b ′, c, c ′, d, d ′ are constants Is shown.

FIG. 3B is a spherical coordinate map created by the conformal cylindrical projection (the Mercator projection). The route has the characteristic of being represented by a straight line, and the conversion formula between the X and Y coordinates on the map and the longitude α and the latitude δ is given by the following equation (2).

X = aα + b Y = cl _n [tan (δ / 2 + π / 4)] + d (2) where a, b, c, and d are constants, and l _n is a natural logarithm.

FIG. 3 (C) is a spherical coordinate map created by the equal-area elliptic projection so that an actual map can be obtained.

The conversion formula between X, Y coordinates on the map and longitude α and latitude δ is
It is given by the following equation (3).

 X = aα cos θ + b Y = c sin θ + d 2θ + sin 2θ = e sin δ (3) where a, b, c, d and e are constants.

In the conversion table 131, the longitude α and the latitude δ corresponding to the X and Y coordinates on the coordinate screen 112 are calculated and stored in advance by the above (1) to (3).

(B) Operation of the Implementation Apparatus The operation of the implementation apparatus of FIG. 2, that is, the operation of the embodiment of the present invention will be described with reference to FIGS.

Three-dimensional display image 11 created by image creating means 15
1 and the coordinate screen 112 are graphically displayed on the display screen 11 of the graphic display device 10 by the display control means 16 (FIG. 1A). FIGS. 3A to 3C show a coordinate screen 112 displayed on the display screen 11 according to the purpose.
FIG. 1 (A) illustrates the map of FIG. 3 (C).

The operator moves the cursor 114 using the input device 121 such as a mouse to indicate a desired line-of-sight direction on the coordinate screen 112 of the display screen 11, that is, an attention position AP.
Since meridians and parallels are displayed on the coordinate screen 112,
It becomes possible to visually input the desired gaze direction,
Easy and accurate input.

The input position coordinate generating means 12 generates X and Y coordinates of the attention position AP specified by the input device 121, and supplies the generated coordinates to the visual line direction information calculating means 13.

The gaze direction information calculation means 13 obtains corresponding gaze direction information, that is, longitude α and latitude δ, from the input X and Y coordinates of the attention position AP with reference to the conversion table 131.

The conversion table 131 includes the displayed coordinate screen 112 (third screen).
The longitude α and the latitude δ corresponding to the X and Y coordinates on any of FIGS. (A) to (C) are previously obtained and stored by the above-described equations (1) to (3). Therefore, the corresponding longitude α and latitude δ can be immediately obtained by referring to the conversion table 131 using the X and Y coordinates as addresses.

The coordinate conversion means 14 performs three-dimensional coordinate conversion of the three-dimensional display image displayed on the display screen 11, based on the longitude α and the latitude δ obtained by the gaze direction information calculation means 13. Next, the three-dimensional coordinate conversion processing will be described with reference to FIG.

In FIG. 4, X, Y, and Z are the rectangular coordinates of the converted three-dimensional display image, and the longitude and latitude in the line of sight are α ₀ and δ.
_Assume that it is ₀ .

In the three-dimensional coordinate conversion processing, the line-of-sight direction is determined by input values (α,
A process of obtaining a coordinate conversion (rotation) matrix for conversion to δ) and converting each point of the coordinates to new coordinates is performed. Display screen
The longitude and latitude representing the line of sight of the three-dimensional display image 111 currently displayed on 11 are α ₀ and δ ₀ , and the line of sight to be displayed this time is α and δ.

Now, assuming that Δα = α−α ₀ , Δδ = δ−δ ₀ (4), the process of converting the line of sight from (α ₀ , δ ₀ ) to (α, δ) is as shown in FIG. Around the Z axis
rotate by α (degrees) (the coordinate axes X ′, Y ′, and Z at that time), and (−Δδ) around the rotated coordinate axis Y ′.
(Degree) It is obtained by rotating. The coordinate axes obtained by this rotation are represented by X ", Y" (= Y '), Z ". A conversion matrix for performing coordinate conversion from these coordinate axes X, Y, Z to new coordinate axes X", Y ", Z" T is given by the following equation (5).

Also, the coordinate vector of each point in the old line-of-sight direction coordinate system (X, Y, Z) is [γ ₀ ], and the coordinate vector of each store in the new line-of-sight direction coordinate system (X ″, Y ″, Z ″) is [ γ], [γ]
Is obtained from the following equation (6).

[Γ] = T [γ ₀ ] (6) In the first display, α ₀ = 0 as a default value
(Degrees), δ ₀ = 0 (degrees), and the longitude and latitude of the currently displayed coordinate system are stored during display.

The display control means 16 displays a three-dimensional display image in which the line-of-sight direction has been changed from (α ₀ , δ ₀ ) to (α, δ) based on the converted three-dimensional coordinate data obtained as described above. Displayed above (FIG. 1 (B)).

Although the embodiment in which the line-of-sight direction information is longitude and latitude has been described above, the present invention is also applied to the case where line-of-sight direction information other than longitude and latitude is used.

〔The invention's effect〕

As described above, according to the present invention, the following effects can be obtained.

(1) Since a coordinate screen is displayed on a part of the display screen 11 and the line-of-sight direction of the three-dimensional display image is input on the coordinate screen, the input line-of-sight direction can be easily visually recognized.

(2) According to the above (2), a line-of-sight input error can be easily found at the time of input, and a line-of-sight input can be performed accurately, easily and quickly, and a three-dimensional display image in which the line-of-sight direction has been changed. Display processing can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of the present invention, FIG. 2 is an explanatory diagram of the configuration of an embodiment of the present invention, FIG. 3 is an explanatory diagram of each map used in the embodiment, FIG. FIG. 4 is an explanatory diagram of a three-dimensional coordinate conversion process in the embodiment. In FIG. 1 and FIG. 2, 10 ... graphic display device, 11 ... display screen, 111 ... 3D display image, 112 ... coordinate screen, 113 ...
.., Cursor 12, input position coordinate generating means 121, input device 13, visual line direction information calculating means 14, coordinate converting means 15, image creating means 16, display control means.

Claims (3)

(57) [Claims] 1. A display system for displaying a three-dimensional image viewed from a specified line-of-sight direction, wherein the display of the three-dimensional image and the development of all the coordinates of the spherical surface, wherein the plane provided with latitude lines and meridians is displayed. Plane display means for displaying, gaze direction input means for inputting a gaze direction from the plane, and display means for displaying the three-dimensional image viewed from the gaze direction based on the gaze direction information. Characteristic display system. 2. A display system for displaying a three-dimensional image viewed from a designated line-of-sight direction, comprising: a plane display means for displaying a plane showing a world map together with the display of the three-dimensional image; A display system comprising: a gaze direction input unit for inputting; and a display unit for displaying the three-dimensional image viewed from the gaze direction based on the gaze direction information. 3. The display system according to claim 2, wherein meridians and parallels are also displayed on the world map.