JPH0233681A - Fluoroscopy picture display device - Google Patents

Abstract

PURPOSE:To display a fluoroscopy picture by storing a projected fluoroscopy picture on a cylindrical surface with a viewpoint as a center and obtaining the picture element reading position of the picture stored from a scroll position signal and the position signal of a displaying picture. CONSTITUTION:A picture memory part 1 stores the projected fluoroscopy picture on the cylindrical surface with a viewpoint as a center. A picture address generating part 2 synchronizes a synchronizing signal 10 inputted from an external part and outputs a horizontal position signal 11 and a longitudinal position signal 12 of the displaying picture. A scroll position signal 13 is inputted from an external part in order to determine the direction of eyes. A reading address preparing part 3 inputs signals 11-13, and outputs a horizontal position integer part signal 14, a longitudinal position integer part signal 15, a horizontal position decimal part signal 16 and a longitudinal position decimal part signal 17 of a picture element reading position from a memory part 1 in order to display a fluoroscopy picture on the displaying screen. Further, a luminance weighted mean part 4 outputs the luminance signal of the picture element of four points of a reading position circumference. Thus, even when the direction of the eyes is changed, the fluoroscopy picture can be displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a perspective image display device for displaying a perspective image.

2. Description of the Related Art In recent years, fluoroscopic image display devices have become increasingly important as computer-aided design and computer graphics advance.

An example of the conventional perspective image display device mentioned above will be described below with reference to the drawings. FIG. 4 shows the groove configuration of a conventional fluoroscopic image display device.

The operation will be explained below.

First, object data characterizing the object to be displayed is created in the object data processing section 41 and stored in the object data memory section 42 . Examples of object data include the positions of vertices representing the shape of an object, and the connections between reconnaissance points, edges, and faces.

Next, the image generation section 43 performs perspective conversion on the object data in the object data memory section 42, calculates the brightness of each pixel on the display screen, stores it in the image memory 44, and reads the brightness of each pixel from the image memory 44 according to the synchronization signal. is read out and displayed on the display section 45iC.

Problems to be Solved by the Invention However, in the above configuration, when the direction of the line of sight changes, it is necessary to perform perspective transformation of the object data in the image generation unit 43 again, and then calculate the brightness of all pixels on the display screen.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a perspective image display device that can display a perspective image without re-executing perspective transformation of object data and image generation even when the direction of the line of sight changes.

Means for Solving the Problems In order to solve the above-mentioned problems, the perspective image display device of the present invention includes an image memory section for storing an image perspectively projected onto a cylindrical surface centered at the viewpoint, and an image memory section for storing an image perspectively projected onto a cylindrical surface centered at the viewpoint; A scroll position signal indicating a position on the cylindrical surface corresponding to the center position, a horizontal position signal and a vertical position signal of the display image are inputted, and corresponding pixels from the image memory unit are inputted to display a perspective image on the display screen. It is provided with a read address generation section that outputs a horizontal position signal and a vertical position signal of the read position.

Effect of the Invention With the above-described configuration, the present invention is capable of displaying a perspective image, which conventionally required perspective conversion of object data and re-execution of image generation when the direction of the line of sight changes. By determining the pixel readout position from the image memory unit, it becomes possible to display a perspective image without re-executing perspective transformation of object data and image (Φ generation).

EXAMPLE Hereinafter, a perspective image display device according to an example of the present invention will be described with reference to the drawings.

FIG. 1 shows the configuration of a perspective image display device according to an embodiment of the present invention. In FIG. 1, an image memory unit 1 stores an image perspectively projected onto a cylindrical surface centered on a viewpoint. The screen address generator 2 receives the same 1! synchronization signal 10 input from the outside! I] and outputs a horizontal position signal 11 and a vertical position signal 12 of the displayed image. A scroll position signal 13 is input from the outside to determine the direction of the line of sight, and indicates a position on the cylindrical surface corresponding to the center position of the displayed image. The read address generation unit 3 has a display screen configuration 1i, +(
The signal 11, the display screen vertical position signal 12, and the scroll position signal 13 are input, and the horizontal position integer part signal 14 and the vertical It outputs a position integer part signal 16, a horizontal position decimal part signal 16, and a vertical position decimal part signal 17.
Input the luminance signals 21, 22, 23, 24 of the pixels at four points around the position indicated by 4 and the vertical position integer part signal 15, and calculate the horizontal position ratio ν according to the vertical position fractional part signal 16 and the vertical position fractional part signal 17. The signals are weighted averaged and a luminance signal 25 is output.

The operation of the R/f perspective image display device as described above will be described below with reference to FIGS. 1, 2, and 3.

First, FIG. 2 shows the positional relationship between the viewpoint, the cylindrical surface, and the display screen. In FIG. 2, an image is perspectively projected onto a cylindrical surface 31 centered at a viewpoint 30, and is stored in the image memory 1. Scroll position 33 from viewpoint 30
A line of sight 34 extends in the direction indicated by. The center point of the display screen 32 is located at the point where the line of sight 34 and the cylindrical surface 31 intersect.

Next, FIG. 3 shows the correspondence between the image memory and the display screen. The position indicated by the scroll position 33 of the image memory 1 corresponds to the center position of the display screen.

The horizontal position of the display screen with the center position of the display screen 32 as the origin is x1, the horizontal position of the image memory 1 is θ, and the scroll position 33 is θ. , where t is the distance between the viewpoint 3Q and the display screen 32, the following relationship holds true: X=j-tan(θ-θ)C.

Further, if Y is the vertical position of the display screen with the center position of the display screen 32 as the origin, and y is the vertical position of the image memory 1 with the center of the image memory 1 as the origin, then Y = y / cos (θ
−θ. ) is established.

Therefore, in the read address generation section 3, when Oc1 is given from the scroll position signal 13, X is given from the display screen horizontal position signal 11, and Y is given from the display screen vertical position signal 12,
Reading horizontal position 0 and reading vertical position lI\y from image memory section 1
is determined by the following calculation.

The integer part θI of the readout lateral position θ is set as the lateral position integer part signal 14,
The decimal part θF is output as a horizontal position decimal part signal 15, respectively. The integer part yI of the read vertical position y is outputted as the vertical position integer part signal 16, and the decimal part yB'' is outputted as the vertical position integer part signal 17, respectively.

If the luminance signal of the pixel at the position indicated by the horizontal integer part signal 14 and the vertical integer part signal 15 from the image memory unit 1 is directly used for display, the outline of the displayed object will be discontinuous, or it will be continuous. Even if the scroll position 33 is changed, the displayed image does not change continuously.

In this embodiment, in order to solve the above problem, a weighted average of luminance is performed. Horizontal position integer part θ and vertical position integer part y1
and the position (θ1, 11).

(OI+1.71), (0 engineering, 71+1), (θ engineering +
1.

The brightness of the pixels of y + 1) is I, , I, respectively. , Eng. ,
Engineering.

Then, the weighted average luminance factor is I = (1-yy) ((1-θF)11+θFI2
)"7F ((1-θF)I3+θFI.).

Therefore, in the luminance weighted averaging unit 4, the first read luminance signal 2
1. Second read luminance signal 22. Third read luminance signal 23. The fourth read luminance signals 24, I, , I2 . I
. , Eng. When θF is given by the horizontal position decimal part signal 16 and 7y is given by the vertical position decimal part signal 17, the weighted average luminance factor is calculated and output as the luminance signal 25.

When the direction of the line of sight 34 changes, the scroll position 33
When the line of sight is changed in a corresponding manner, an image perspectively projected onto the screen corresponding to the changed line of sight is read out from the image memory 1 and displayed. In this case, perspective transformation of object data and image generation are not required.

As described above, according to the present embodiment, there is an image memory unit that stores an image perspectively projected onto a cylindrical surface centered at the viewpoint, and a position on the cylindrical surface corresponding to the center position of the displayed image. A scroll position signal, a horizontal position signal, and a vertical position signal of a display image are manually input, and a horizontal position signal and a vertical position signal of a corresponding pixel read position from the image memory section are outputted for displaying a perspective image on a display screen. Even if the direction of the line of sight changes, a perspective image corresponding to the changed line of sight can be displayed without requiring perspective conversion of object data and re-execution of image generation.

Effects of the Invention As described above, the present invention includes an image memory section for storing an image perspectively projected onto a cylindrical surface centered on a viewpoint, and a position on the cylindrical surface corresponding to the center position of the displayed image. Inputs a scroll position signal, a horizontal position signal and a vertical position signal of a display image, and outputs a horizontal position signal and a vertical position signal of a corresponding pixel read position from the image memory section for displaying a perspective image on a display screen. By providing a readout address generation unit that changes the direction of the line of sight, it is possible to display a perspective image corresponding to the changed line of sight without requiring perspective conversion of object data and re-execution of image generation. can.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a perspective image display device according to an embodiment of the present invention, FIG. 2 is a conceptual diagram of a viewpoint, a cylindrical surface, and a display screen in the embodiment of FIG. 1, and FIG. 3 is an implementation of FIG. 1. FIG. 4 is a conceptual diagram of an image memory and a display screen in an example, and is a configuration diagram of a conventional perspective image display device. 1... Image memory section, 2... Screen address generation section, 3... Read address generation section, 4...
...Brightness weighted average part. ++? 1st page diagram

Claims (2)

[Claims] (1) An image memory unit that stores an image perspectively projected onto a cylindrical surface centered on the viewpoint, a scroll position signal indicating a position on the cylindrical surface corresponding to the center position of the displayed image, and a horizontal position of the displayed image. a readout address generation unit that receives a position signal and a vertical position signal as input and outputs a horizontal position signal and a vertical position signal of a corresponding pixel read position from the image memory unit for displaying a perspective image on a display screen; Transparent image display device. (2) A screen address generator that outputs a horizontal position signal and a vertical position signal of a display image in synchronization with a synchronization signal input from the outside, and a screen address generator that stores an image perspectively projected onto a cylindrical surface centered on the viewpoint. A perspective image is displayed on a display screen by inputting an image memory section to be stored, a scroll position signal indicating a position on the cylindrical surface corresponding to the center position of the display image, and a horizontal position signal and a vertical position signal of the display image. a read address generating section that outputs a horizontal position integer part signal, a horizontal position decimal part signal, a vertical position integer part signal, and a vertical position decimal part signal of a pixel read position from the corresponding image memory section; The luminance signals of four pixels around the image memory location indicated by the integer part signal and the vertical integer part signal are input, and the weighted average of the luminance signals is performed according to the horizontal decimal part signal and the vertical decimal part signal to create a perspective image. A perspective image display device comprising: a luminance weighted averaging unit that outputs a luminance signal.