JPH0261687A - Brightness control system for cad holography system - Google Patents

Abstract

PURPOSE:To vary brightness freely by the emphasis of shading, etc., according to the purpose of presentation by providing a brightness converting means between a means which generates stereoscopic graphic data and a means which photographs a correction image on a film and generate a hologram. CONSTITUTION:The brightness converting means 2 is interposed between the means 1 which generates the stereoscopic graphic data and the means 3 which photographs the correction image on the film and generates the hologram, and the correction image is converted to brightness which suits to the hologram and is different from the brightness of an image display set by the means 1 and then photographed on the film. Consequently, the hologram which is varied in brightness freely by the emphasis of shading unlike normal CAD data according to the purpose of presentation is obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention combines holography technology for displaying objects in three dimensions with CAD-CG technology, generates three-dimensional figure data from building configuration data, and generates holograms. C to create
The present invention relates to an AD holography system, and particularly to a cylindrical multi-branch holography system capable of switching and displaying a plurality of images.

[Conventional technology]

Architecture is based on making-to-order products, and it is not possible to use methods such as confirming product quality with the actual product and encouraging customers to purchase, as is the case with industrial products.For this reason, in architectural design, each part of the design It is important to proceed with the work while obtaining the customer's agreement on the design and plan contents at each stage. Therefore, there has been a lot of interest in presentation methods for building consensus.

Conventionally used presentation methods include, for example, creating a model according to a blueprint or plan and explaining the design and plan contents using the model, and creating a hand-drawn perspective to explain the design and plan contents. There are ways to explain the plan, create and design an animated video, and explain the plan.

[Problem to be solved by the invention]

However, with any of the above methods, it is necessary to actually create a model according to the ζ design and plan contents, create a perspective by hand, and think of an animation to match the explanation, which requires a lot of effort and time. There is a problem in that it takes a lot of time and the cost is also high. Furthermore, even when multiple sets of models are created, each set requires the same amount of time, effort, and cost to create. Moreover, since it is not something that can be mass-produced, any changes will require rework, resulting in large losses. Therefore,
Usually, a large number of models are not prepared due to cost etc., so the customer has multiple decision-making machines r'A (person).
If there is a need to make a presentation to each organization, the problem is that the presentations have to be rotated around, making it impossible to make quick decisions. This problem also occurs with handwritten parsing. In addition, it is a heavy burden on the producer to imagine something that does not exist and express it three-dimensionally, making it difficult to actually express it three-dimensionally.

As mentioned above, conventional presentation methods require effort, time, and cost to produce a large number of 3D visualization and convenient reproduction devices, and furthermore, it is difficult to obtain a convincing presentation. Because of the difficulty, expectations are high for the introduction of new presentation methods that are persuasive and can replace traditional methods.

The present invention solves the above-mentioned problems, and the CAD
-ca and three-dimensional holography (multiplex), an established basic technology, to provide a new presentation method.

[Means to solve the problem]

To this end, the present invention generates three-dimensional figure data from building configuration data to create a plurality of perspective image data,
Distortion is corrected by dividing plane element assembly loss processing of each perspective image data, and the corrected image is photographed on film to produce a hologram, and a 3D image of the building is displayed using cylindrical 3D holography that can be observed from all around. CAD
The holography system is characterized in that a brightness conversion means is interposed between the means for generating three-dimensional figure data and the means for producing a hologram by photographing a corrected image on a film.

(Function) In the brightness control method of the CAD holography system of the present invention, the brightness conversion means is interposed between the means for generating three-dimensional figure data and the means for producing a hologram by photographing a corrected image on film. It is possible to convert the brightness to a brightness suitable for a hologram, which is different from the image display brightness set by the means for generating graphic data, and shoot a corrected image on film. Unlike brightness, it is possible to provide a hologram whose brightness can be freely changed depending on the purpose of the presentation, such as emphasizing shadows.

〔Example〕

Examples will be described below with reference to the drawings.

FIG. 1 is a diagram for explaining one embodiment of the brightness control method of the CAD holography system according to the present invention, and FIG. 2 is a diagram for explaining the hologram production procedure of the cylindrical multiplex holography system according to the present invention. It is.

First, the hologram production procedure separately proposed by the applicant will be explained with reference to FIG.

■ Using CAD functions, enter the building's external dimensions, positional dimensions of each structural member, floor height, and building configuration data (dimensional data, material data, shape data) based on the blueprint, and create this configuration data. Generate graphic data from , and use a CG (computer graphics) function to generate three-dimensional graphic data having relative coordinates, angle information, etc.

■、■ Next, set the scale, viewpoint distance, and angle of view based on the standardized data to create a hologram.■ Create a perspective image according to the standardized data and hologram configuration and size. do.

For example, the size of the image displayed as a hologram can be up to 180 m.
In the case of m, the scale is set accordingly, and the viewpoint distance is set according to the angle of view. Therefore, if the height of the building is 180m as shown in the figure, the scale will be 1/l O00, and the angle of view will be 11
If the distance is 875 m, the viewpoint distance will be 875 m, and under this condition, a perspective image that looks like it was taken with a camera will be created.

After that, (1) perform distortion correction processing, (2) photograph the image on 35 mm film, and (2) create a hologram.

As described above, in the hologram creation procedure, the CAD holography system according to the present invention generates three-dimensional figure data from the configuration data of the design drawing, and then creates image data for holography creation from this by setting predetermined conditions. It doesn't take much to create. In addition, in general holography, distortion correction may not be performed, but when displaying a building with many straight lines as a 3D image, the distortion of these straight lines becomes a problem, and it must be processed to obtain a clearer image. As the number of pixels increases, the capacity for distortion correction processing also increases. Therefore, in order to correct such distortions peculiar to buildings, it is necessary to devise a correction process.

By the way, data from a CAD system generally has high brightness, so if this data is used as is in the CAD holography system to create a hologram, the overall image will be too bright and have poor contrast. Therefore, in the present invention, certain corrections are made to the brightness of image data when photographing with film. An example of the conversion curve is shown in Fig. 1(a). In Fig. 1(a), the horizontal axis is input (brightness of CG data) and the vertical axis is output (brightness of photographic data). , curve A is an example of compressing a high-brightness portion, and even if the brightness change of the input data is large in the high-brightness portion, the brightness change of the output data is reduced.

Further, curve B, contrary to curve A, increases the brightness change as output data even if the input data has a small brightness change in a high brightness portion.

In order to convert the brightness of image data using the conversion curve as described above, for example, as shown in ) in the same figure, a look-up table 2 is prepared, and the image data l is sequentially read out and imaged on the image means 2. When photographing on film, it is sufficient to use the brightness information as the address of the look amplifier table 2 and sell the converted brightness information.

FIG. 3 is a diagram for explaining one embodiment of a cylindrical multiplex holography system, and FIG. 4 is a diagram showing an example of a configuration in which a plurality of light sources are used in a cylindrical multiplex hologram. 11 and 13 are cylindrical multiplex
A hologram, 12 is a switch, and 14 and 15 are light sources.

In FIG. 3, the cylindrical multiplex hologram 11 has two light sources and can reproduce two images from the two holograms, and the lighting of the two light sources is dimmed and controlled. This is the switch 12. The switch 12 is slid between one end A and the other end B to continuously switch from the A side to the B side. When the switch 12 is slid to the A side, one light source of the cylindrical multiplex hologram 11 is gradually switched. If you turn it brighter and slide it back to the B side, one light source will gradually go out and the other will gradually become brighter.

For example, basically there are two plans for the exterior design, A and B.
If you create a proposal, explain its advantages and disadvantages, and then ask the customer to make a final decision, the steps to explain are as follows:
First, as shown in FIG. 3(a), the switch 12 is slid to the A side to make an image of plan A appear, and the design purpose of plan A will be explained while the image is rotating. After that, slide the dimmable switch 12 from the A side to the B side,
Gradually the image of plan A disappears, and plan B gradually emerges.

Then, the purpose of the design of plan B will be explained while the image is rotating.

As mentioned above, effective presentations that display multiple images using two light sources include structural When comparing the structure (frame) and the completed building for a plan, when comparing before and after reconstruction for a rebuilding plan, and comparing the eaves before construction and the roundabout after construction for a landscape plan. There are cases etc.

As shown in FIG. 4, the configuration of the cylindrical multiplex hologram 13 includes light sources 14 and 15 provided above and below,
By storing two holograms inside, the design,
Three-dimensional images of planned buildings can be selectively reproduced. Since this cylindrical multiplex hologram 13 is cylindrical, it can be observed from all around. By providing lights #14 and #15 above and below, two images can be reproduced.

Next, the specific configuration of each part will be explained.

FIG. 5 is a diagram showing an example of the configuration of a processing system for creating image data for holography creation. In the figure, 21 is a data input section, 22 is an analysis section, 23 is a CG data creation section, 24 is a perspective image creation section, 25 is a distortion correction processing section, 26 is a storage section, 27 is a display control section, and 28 is a display section shows.

In FIG. 5, a data manual section 21 inputs data, system control commands, etc. using a combination of a keyboard, a display screen, a mouse, a cursor, and the like. The analysis section 22 identifies and analyzes the information (data, commands) input from the data input section 21, and converts it into the CG data creation section 2.
3. It controls the perspective image creation section 24, distortion correction processing section 25, display control section 27, etc. CG data creation section 23, perspective image creation section 24, and distortion correction processing section 25
operates in each mode, creates CG data and perspective image data based on data input manually through the analysis unit 22 and data stored in the storage unit 26, performs distortion correction processing, and stores the data in the storage unit 26. This process performs the following processing. The display unit 28 consists of a CG display, and the display control unit 27 displays images of the CG data and perspective image data stored in the storage unit 26, and the data subjected to distortion correction processing, on the screen of the display unit 2. It performs control processing to

When distortion-corrected perspective image data is obtained by the system as described above, the perspective image is projected onto a 35 mm film, for example, to produce a plurality of frames of holograms.

FIG. 6 is a diagram illustrating conditions for expressing holography in an appropriate form.

In FIG. 6, MH is a hologram, AB is CG data, E is a viewpoint, and OE is a viewpoint distance.

Now, assuming that 0A=OB=90mm OH=200mm OE=1000mm, in such a multiplex hologram (360') with a cylinder diameter of 400mmφ, the hologram pitch is 0.514mm and the total number of holograms is 2445.
becomes. Therefore, the total number of frames in the original cine film is 244.
5/n (n is an integer), but in the present invention, four holograms are created from one original frame (n=4), so the total number of frames in the original cine film is 611.

On the other hand, in Fig. 6, if ZOHA=24.23' 10HE=155.77° and /HOC=x, then OH/sin (24,23-x) = OE
/sin 155.77, so x=19.52@
Therefore, on the arc of CH (19°52°) there is 132.5
The element hologram will be included. Therefore, from point E, 265 element holograms are viewed simultaneously.

In other words, when these 265 elemental holograms are played back by 4-frame composition, 66.25 movie frames (=265
/4) at the same time.

This means that all you have to do is divide the movie frames into 66 equal parts and rearrange them.

Note that the following explanation will be based on an example configured with n=4.611 screens.

Figure 7 is a diagram for explaining the distortion correction process, where (a) is the original image, (b) is the new image, (C) is an example of the screen configuration, and (d) is the original image.
shows a display image, and FIG. 8 is a diagram showing an example of the configuration of a new image.

In hologram distortion correction processing, as is already well known, the original image 0. is reconstructed to create a new image N3, but
In this reconstruction process, one original image 0. Divide into X equal parts.

This divided one by one a, agba 3rd order...
aI...pot/life, a' is called a surface element, and the new image (corrected image) N3's surface element a, which is rearranged, is the original image OS-
Let the surface elements of A be a,'. Here, A is x+1, and the original image OS-A means the SA-th original image.

FIG. 7(C) shows an example in which the number of divisions is set to 64 on a screen with 512×512 pixels, and in this case, one surface element consists of 8 lines. When such a new image is displayed on the screen, the data on the right side R becomes a picture seen more from the left, and the data on the left side becomes a picture seen more from the right (Figure 7 (d)).
).

For ease of explanation, as shown in Fig. 8 (al.
Image reconstruction processing will be explained using an example in which original images 01 to O3 are divided into four equal parts.

Now, looking at the processing for the new image N, its surface element a
The original image of , from S-A in the above equation, S is 3 and A is (
5/2)-,1, that is, 5-A=3-(--1) =3-(2-1)=2, so it becomes Ol. Similarly, the surface element a2 of the new image N is the 82nd surface element a of the original image O2,
is surface element a of original image 04.

Surface element a4 is reconstructed using surface element a4 of original image O2. FIG. 8(b) shows the new images N, .about.N, reconstructed as described above.

Here, for example, for the surface element a1 of the new image N, 5-
A=1- (--1) =1- (2-1)=O→5, so the original image is 0. The surface element a1 of is assigned, and the new image N
For the surface element a4 of 4, the original image OI is obtained by 5-A-6→l, and for the surface element a4 of the new image N, 5-
Original image 02 is assigned by A=7→2.

When the above processing is applied to the screen shown in Figure 7(C), 5
-A-1-((65/2)-13 =1-31=-30→581. Therefore, the surface element a of the first new image N.

is created from the surface element a1 of the original image OS□, the first new image N1 is the original image 05.1~0°, the second new image N2 is the original image OS@2~Ch4,... ..., the 611th new image N611 is the original image 05. . ~0.2 pieces will be made.

Next, a specific example of data processing will be explained.

Figure 9 is a diagram explaining the flow of data processing, Figure 10
The figure is a diagram for explaining the flow of distortion correction processing.

For example, the minimum configuration data required to realize the holography of the present invention includes data regarding external walls, pillars, roofs, windows, doors, and site conditions (trees and poles), as shown in Figure 9 (a). These two-dimensional data are input based on blueprints, planning drawings, etc. In this case, the material, light,
Shading, color, etc. are added as necessary. From these input data, CAD-CG generates three-dimensional graphic data as shown in FIG. 10(b), which is further recognized as each three-dimensional surface data as shown in FIG. 10(c). From such data, perspective image data is created under predetermined conditions as shown in FIG. 4(d). This means that, for example, an image that looks like a photograph with the angle of view and viewpoint distance is 100
It is expressed as a mm-sized hologram. Once this perspective image data is stored in the storage device MT, next
Distortion correction processing is performed.

In the distortion correction process, for example, n new image (corrected image) generation areas MHI-MN7 and one original image area M are generated as shown in FIG. is prepared in the work area, one original image is stored in the original image area M from the storage device MT. is read out, and each surface element is written into the corresponding new image generation areas MH1 to M0. Similar processing is repeated until n new images are completed and stored in the storage device MT. moreover,
the new image generation area M until a predetermined number of new images are completed;
, ~ Repeat the image generation process using M0.

For example, 15 images (n
=15), and when one image is composed of 64 plane elements, 63+15=78 original images are read out. In other words, if 78 original images are read out at once, 15 new images can be created. If the user subsequently attempts to create 15 new images, it is necessary to read out another 15 original images. In other words, in the case of an image composed of 64 plane elements, it is necessary to read out the original image corresponding to it until 64 new images are created, but after that, instead of adding the original image, FI
It can be rewritten using FO. Therefore, when 127 original images are read, 64 new images can be created, and after that, i new images can be created every time i original images are read (rewritten).

As in the previous example, the first new image N, is the original image 0, □~
0°, second new image N! is the original image 03.1~0□,
......, the 611th new image N11 is the original image 0
6th. When creating images from ~0°, if you do this in three times, as shown in Figure 10, if the number of images handled at one time is 273 (210 + 63), then 210 images will be processed at one time. New images can be created, and if each image is divided into 15 images, it will be divided into 14 images. Therefore, distortion correction for 611 images can be completed by repeating this processing unit three times. By doing this,
Even for holograms of buildings with a large number of images, distortion correction processing can be efficiently performed in a work area with little memory and by dividing dedicated time even when using a host computer.

Next, the cinematography for cylindrical multiplex hologram original images will be explained.

The original image is shot with a 35 mm cine camera using monofilm, and the camera or subject is rotated so that the axis of rotation coincides with the longitudinal direction of the movie film. Then, place the subject at the center of the rotating table, and when rotating the camera around the subject, keep the subject at the center of rotation ().

Note that if the number of frames of the camera is m (377 seconds) and the time of one rotation of the rotary table or the camera is t seconds, then m - L = 1223 frames if two holograms are created from one frame. For example, one rotation time is 4
In the case of 5 seconds, the number of frames to be photographed is 27 (377 seconds).

Furthermore, when three holograms are created from one frame of the original image (n=3), m-t=815 frames.

Note that the present invention is not limited to the above embodiments, and various modifications are possible. For example, in the above embodiment, the brightness was converted when the image data was re-imaged, but the brightness conversion process is performed in steps in the middle of data processing, such as the step of generating stereoscopic image data and the step of creating perspective image data. May be inserted. Further, a plurality of conversion tables may be prepared depending on the purpose, and the conversion tables may be switched as appropriate.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, since a brightness conversion means is provided, the brightness is converted to a brightness suitable for a hologram, which is different from the brightness of the image display set by the means for generating three-dimensional figure data. The corrected image can then be captured on film.

Therefore, unlike the brightness of normal CAD data, the brightness can be freely changed according to the purpose of the presentation, such as emphasizing shadows, and the degree of freedom of expression can be increased.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining one embodiment of the brightness control method of the CAD holography system according to the present invention, and FIG. 2 is a diagram for explaining the hologram production procedure of the cylindrical multiplex holography system according to the present invention. , Figure 3 is a diagram for explaining one embodiment of a cylindrical multiplex holography system, Figure 4 is a diagram showing an example of the configuration of a cylindrical multiplex hologram, and Figure 5 is a diagram for creating image data for holography creation. A diagram showing an example of the configuration of a processing system, FIG. 6 is a diagram explaining conditions for expressing holography in an appropriate form, and FIG. 7 is a diagram explaining distortion correction processing. (a) is an original image , (b) is a new image, (C) is an example of a screen configuration, (d) is a display image, FIG. 8 is a diagram showing an example of the configuration of a new image, and FIG. 9 is for explaining the flow of data processing. and FIG. 10 are diagrams for explaining the flow of distortion correction processing. 1... Image data, 2... Imaging means, 3... Look-up table. Applicant Shimizu Corporation (1 other person)

Claims (1)

[Claims] (1) Generate three-dimensional figure data from the building composition data, create multiple perspective image data, correct distortion by recombining the dividing planes of each perspective image data, and shoot the corrected images on film. In a CAD holography system that displays a three-dimensional image of a building using cylindrical three-dimensional holography that can be observed from all sides by producing a hologram, a means for generating three-dimensional figure data and a corrected image are photographed on film to produce a hologram. C, characterized in that a luminance conversion means is interposed between the means for
Brightness control method for AD holography system.