JPH0327081A - Video projecting method - Google Patents

Abstract

PURPOSE:To easily correct a displayed image by performing scanning with respect to an object to be projected parallel to a line connecting the visual point of a pilot and the projection center of a projector. CONSTITUTION:For observation by a pilot in a cockpit 21, a required video is projected on a curved surface screen 25 in the inner wall part of a dome 24 in which the cockpit 21 is mounted. Then, parallel to the line connecting the visual point E of the pilot and the projection center S of the projector, scanning with respect to the object to be projected is performed. Thus, for the video projected on the curved screen 25, a coordinate system 11 in which only an X-axis is in a curve shape and an Y-axis is linear is corrected into a coordinate system 12 in which also the X-axis is linear and the X and Y axes perpendicularly intersect each other. Thus, proper correction with respect to a video is easily applied only by applying one-dimentional correction.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an image projection method, and in particular, when an image is projected using a curved screen, it is possible to easily correct the displayed image. This paper relates to an image projection method that uses the following methods. [Prior art 1] Figure 2 is a schematic diagram of a general image projection system.
In this FIG.
It is installed in Further, the projector (23) is installed so as to face a curved screen (25) which is a part of the inner wall of the dome (24). (E) is the viewpoint of the pilot inside the cockbit (21), from which he can see the image projected on the curved screen (25). Note that (S) is the projection center of the projector (23), (■,) is the real image projected onto the curved screen (25>), and (■2) is its original image.

FIG. 3 is an explanatory diagram regarding correction of a displayed image using a conventional method for the general image projection method described above. In this Fig. 3, Fig. 3 (A) is
This is a diagram illustrating a display based on the axis and Y-axis coordinate system, and is when an image is projected onto the curved screen (25) in FIG. 2, and FIG. X after
This is a diagram illustrating a display using an axis and a Y-axis coordinate system. First, in FIG. 3(A), the coordinate system before correction is (31
), it is recognized that both the X-axis and the Y-axis are curved. In this case,
No special efforts have been made to scan the projection target. In addition, in FIG. 3(B), the coordinate system after correction is shown as (32), but here, both the X-axis and the Y-axis are linear, and both It is recognized that they are orthogonal. Here, in Figure 3 (A
The coordinates of point (P) in ) are (x.y), and the coordinates of the corresponding point (P") in FIG. 3(B) are (x', y'
), then there is a certain functional relationship between them, such as the order u. x' = f M (x.y)y = fy
(x, y) That is, according to this conventional method, it is necessary to perform correction on both the It becomes expensive. Issue M to be Solved by the Invention] Conventional image projection methods are performed in the manner described above, and for example, when projecting an image using a curved screen, the image displayed is Since it is necessary to perform the correction, there is a problem that the correction means for this becomes complicated and expensive. This invention was made to solve the above-mentioned problems, and it is possible to easily perform one-dimensional correction of the image displayed when projecting an image using a curved screen. The purpose is to obtain an image projection method.

[Means for Solving the Problems] An image projection method according to the present invention provides a method for projecting an image onto an inner wall of the dome from a projector installed at a suitable location in the dome in which the cockpit is installed, for observation by a pilot in the cockpit. In the method for projecting a desired image onto a curved screen in a projector, the projection target is scanned in parallel to a straight line connecting the pilot's viewpoint and the projection center of the projector. It is something that exists. [Operation] According to the present invention, since the projection target is scanned parallel to the straight line connecting the pilot's viewpoint and the projection center of the projector, the image projected on the curved screen is one-dimensional. Appropriate correction can be achieved for the image by simply applying the correction. [Embodiment] FIG. 1 is an explanatory diagram regarding the correction of the displayed image by the method of the embodiment of the present invention for the general image projection method shown in FIG. 2 above. In this Fig. 1, Fig. 1 (A) is an exemplary view of the display according to the X-axis and Y-axis coordinate system before correction is applied, and the image is projected onto the curved screen (25) of Fig. 2 above. FIG. 1(B) is a diagram illustrating a display in the X-axis and Y-axis coordinate system after correction. First, in Figure 1(A), the coordinate system before correction is shown as (l1), but the X-axis is curved and the Y-axis is straight. It is recognized that In this case, the scanning of the projection target is performed from the pilot's viewpoint (E) in the cockbit (21).
and the projection center (S) of the projector (23).
In Figure (A), only the X-axis is curved, and the Y-axis is straight. In addition, in FIG. 1(B), the coordinate system after correction is shown as (l2>), but here, the X-axis is also linear, and
It is recognized that both the axis and the Y axis are orthogonal. Here, the coordinates of point (P) in Fig. 1 (A>) are (x.y)
, and if the coordinates of the corresponding point <P゛) in Fig. 1(B) are (x.y'), then there is a certain predetermined functional relationship between them as follows. Become. x − x y'=f(x+y) In other words, according to the method of this embodiment, there is no need to perform correction on the X axis, and it is only necessary to perform correction on the Y axis. Since dimensional correction is sufficient, the correction means for that purpose is simpler and cheaper.

[Effects of the Invention] As explained above, the image projection method according to the present invention provides a method for projecting images from a projector installed at an appropriate location in the dome in which the cockbit is installed, for observation by the pilot inside the cockbit. , in the method for projecting a desired image onto a curved screen on the inner wall of the dome, the projection target is scanned in parallel to a straight line connecting the pilot's viewpoint and the projection center of the projector. Since this is done, it is possible to easily and inexpensively achieve appropriate correction for the image projected on the front screen by simply applying one-dimensional correction to the image. ．．

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a video projection method that is an embodiment of the present invention, FIG. 2 is a schematic diagram of a general video projection method, and FIG. 3 is an explanatory diagram of a conventional video projection method. It is. (21) is the cock bit, (22) is the arm, (23) is the projector, (24) is the dome, (25) is the curved screen, (I.) is the image on the curved screen (25), (■2)
is the original image of the image (II), (E) is the pilot's viewpoint in the cockpit (21), (S> is the projection center in the projector (23). Figure 2 (A) (B) Figure 3 (A) (B) Y Y

Claims (1)

[Claims] (1) For observation by the pilot in the cockpit, a projector installed at an appropriate location in the dome in which the cockpit is installed projects a required image onto a curved screen on the inner wall of the dome. An image projection method characterized in that the projection target is scanned in parallel to a straight line connecting the pilot's viewpoint and the projection center of the projector.