JPH06301751A - Editing and display method for preparing three-dimensional data and device therefor - Google Patents

Abstract

PURPOSE:To provide editing and display method and device suited to the case of preparing object data in a three-dimensional space from a perspective drawing by utilizing cross-section lines. CONSTITUTION:Image data and vector/point data for constituting two-dimensional data are separately handled and an image data storage part 13 for storing the image data and a vector/point data storage part 14 for storing the vector/ point data are provided. Then, by a display and output part 16, both data are superimposed and displayed at a display device 11. An editing part 19 for the vector/point data is provided. Further, a magnification/reduction part 21 is provided and when the vector/point data are magnified/reduced, the image data are also magnified/reduced with a same ratio.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for editing and displaying when three-dimensional data is created from two-dimensional data represented as a perspective view, and in particular, one sheet on which a three-dimensional object is projected or drawn. The present invention relates to an edit display method and apparatus for creating object data of an original three-dimensional object from a photograph, electronic image, sketch, picture, perspective, etc. using a computer.

[0002]

2. Description of the Related Art When it is desired to obtain object data of an original three-dimensional object (coordinates of each point forming the object in a three-dimensional space) from a perspective view of a three-dimensional object projected on a two-dimensional plane. Often. The perspective view projected onto the two-dimensional plane here includes photographs, electronic images, sketches, paintings, perspectives, and the like. For example, for product appearance design,
For example, when you want to create a model of a 3D object based on the sketch or perspective drawn on the industrial designer. When there are two or more perspective views from different viewpoints, the method based on the binocular stereoscopic method can be applied. Only the method (see Japanese Patent Application Laid-Open No. 3-154927) has been known.

On the other hand, the present applicant has filed Japanese Patent Application No. 4-296.
No. 775 (“Apparatus and method for creating object data from perspective view”), a new method for creating object data of a three-dimensional object from one perspective view was proposed. This method uses, as a perspective view, a cross-sectional line (corresponding to a cut when cut on a plane) when a target object is cut on a plane is drawn in a projected image. Then, from the positional relationship between the vanishing point corresponding to the plane of the cut and the viewpoint of the perspective view, an equation expressing the plane of the cut is obtained in the three-dimensional space including the perspective view, and the equation is obtained (the three-dimensional space). The cross-section line is projected on the plane (inside) with the viewpoint as the projection center, and the object data is acquired from the projected image. In this case, it is general that the cross-section line in the perspective view is treated as vector data, and the vector data is subjected to arithmetic processing to obtain object data in a three-dimensional space.

[0004]

The main use of the method of creating object data from a perspective view using cross-section lines is to use the sketches and perspectives drawn by the designer to convert the object data of what is drawn there. For example, when trying to acquire. In such a case, it is important to obtain the object data that the designer had in mind, and referring to the acquired object data, correct the original perspective view or cross-section line, and Often things like acquiring object data are done. In this case, it is the designer himself who performs such work. However, there has been a problem that the editing display method suitable for the work described heretofore has not been established, and the work procedure is complicated and difficult to understand.

It is an object of the present invention to provide an editing and displaying method and apparatus suitable for creating object data in a three-dimensional space from a perspective view using a section line.

[0006]

According to the edit display method for creating three-dimensional data of the present invention, two-dimensional data is composed of image data and vector / point data, and the image data and the vector / point data are the same. A display step of superimposing and displaying on the screen, an editing step of editing the vector / point data, and an operation based on the vector / point data edited in the editing step to create and create three-dimensional data A three-dimensional data creation / display step of displaying based on the three-dimensional data, and a similar transformation step of enlarging / reducing the image data at the same ratio when the vector / point data is enlarged / reduced. Have.

The edit display device for creating three-dimensional data of the present invention comprises a first storage means for storing image data of the two-dimensional data and a second storage means for storing vector / point data of the two-dimensional data. Storage means, display screen,
Display output means for superimposing and displaying the image data and the vector / point data on the display screen with reference to the first and second storage means, and an instruction input by an editing instruction for the vector / point data The vector / point data is changed according to the input means and the variant instruction, and when the editing instruction is an enlargement / reduction instruction for the vector / point data, the image data is also enlarged / reduced at the same ratio. Editing means and three-dimensional data created by performing calculations based on the vector / point data 3
And a three-dimensional data creation and display means for displaying the dimensional data on the display screen.

[0008]

[Function] The two-dimensional data represented by the perspective view is divided into the image data and the vector / point data, and the image data and the vector / point data are superimposed and displayed, so that the original perspective view can be confirmed. You can proceed with the work. Here, the image data is, for example, data in which a perspective view represented as a sketch or perspective is directly captured as pixel data. On the other hand, as the vector / point data, for example, line segments or points forming a cross section line, vanishing lines or vanishing points, etc. may be mentioned. That is, the vector / point data is data that is directly used in the calculation for creating the three-dimensional object data, and is the object of the editing work.

According to the present invention, when the vector / point data is enlarged / reduced, the image data is also enlarged / reduced at the same ratio. For this reason, the original perspective view and the cross-sectional line are always correctly overlapped even when the enlargement / reduction is performed, and the work efficiency can be improved.

Further, according to the present invention, in order to improve workability, a plurality of continuous line segments are changed to one corresponding line segment, or a designated position (point) on the screen according to an instruction.
At least one vanishing line passing through can be displayed.

[0011]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an edit display device according to an embodiment of the present invention. This edit display device is used when three-dimensional data is created from two-dimensional data represented in perspective view, and is capable of interactively issuing edit instructions.

A display device 11 such as a CRT for displaying is provided, and an output interface section 12 serving as an interface to the display device 11 is provided. The two-dimensional data expressed in perspective view is divided into vector / point data and image data, and a vector / point data storage unit 13 and an image data storage unit 14 for storing these data are provided. . Corresponding data is externally input to these data storage units 13 and 14. Here, the vector / point data is used to generate three-dimensional data and is a target of the editing operation. A display output unit 16 that reads out data from the vector / point data storage unit 13 and the image data storage unit 14, respectively, and displays the vector / point data and the image data in a superimposed manner on the screen of the display device 11 via the output interface unit 12. Is provided. Only one of the vector / point data and the image data can be displayed as required by an external instruction.

Further, on the output side of the vector / point data storage unit 13, a three-dimensional data generation / display unit 17 for performing a calculation based on the vector / point data to generate three-dimensional data.
Is provided. The generated three-dimensional data is displayed on the screen of the display device 11 from the three-dimensional data generation / display unit 17 via the output interface unit 12.

An instruction input unit 15 for inputting various instructions to the edit display device is provided, and the input instruction is supplied to the vanishing line display unit 18 and the editing unit 19. A pointing device such as a mouse or an electronic pen is connected to the instruction input unit 15. Then, by clicking an icon displayed on the screen of the display device 11 with these pointing devices, an instruction specified by the icon is input. The vanishing line display unit 18 is the vector / point data storage unit 1.
By referring to the vanishing point data stored in No. 3, a straight line (vanishing line) passing through the vanishing point and the position (point) designated by the instruction is calculated, and the calculated vanishing line is output to the output interface unit 12
Display on the display device 11 via. At this time, the vanishing line is displayed so as to be superimposed on the two-dimensional data.

The editing unit 19 refers to the vector / point data storage unit 13 to perform an editing operation on the vector / point data. A line segment changing unit 20 is provided inside the editing unit 19. The line segment changing unit 20 executes a process of changing a plurality of selected continuous line segments into one line segment in response to an instruction input via the instruction input unit 15.
In this case, the end points of the changed line segment can be freely set. Also, at the same time as performing the process of changing,
The line segments before the change are deleted. An enlarging / reducing unit 21 is provided between the editing unit 19 and the image data storage unit 14. The enlarging / reducing unit 21 enlarges / reduces the image data at the same ratio when the enlargement / reduction operation is performed on the vector / point data.

Next, the operation of the edit display device will be described with reference to the flowchart of FIG.

First, it is judged whether the input instruction is a vanishing line command (step 51). Here, the vanishing line command is a command for displaying on the screen a vanishing line connecting a vanishing point and a position designated on the screen. If the command is not the vanishing line command, the process proceeds to step 52. If the command is the vanishing line command, control is transferred to the vanishing line display unit 18, the vanishing line is calculated, and the calculated vanishing line is displayed on the screen of the display device 11. Is displayed (step 59), step 5
Move to 2.

At step 52, it is determined whether the input instruction is an instruction for data editing. If the instruction is not to edit data, the process proceeds to step 53. On the other hand, if the instruction is to edit data, editing operations such as addition, movement, connection, disconnection, and deletion of vector data are executed according to the instruction (step 60), and then a plurality of line segments are deleted. A determination is made as to whether or not it is a book processing (step 61).
In the case of the process of making a plurality of line segments into one, the line segment changing unit 2
When 0 is set, a plurality of line segments are made one and the line segment before the change is deleted (step 62), and the process proceeds to step 53. Otherwise, the process directly proceeds to step 53.

At step 53, it is judged whether the drawing data for display on the display device 11 needs to be corrected. If correction is necessary, conversion to display coordinates by enlargement / reduction / movement, correction of coordinate values due to calculation error, clipping processing of the display screen, and the like are performed as necessary (step 63). A determination is made as to whether or not the image / point data has been enlarged / reduced (step 64). When the enlargement / reduction is not performed, the process proceeds to step 54, and when the enlargement / reduction is performed, the enlargement / reduction unit 21 performs the enlargement / reduction process on the image data (step 65) to obtain the image data. Is updated and displayed on the display device 11, and the process proceeds to step 54.

In step 54, the vector data is drawn on the display device 11, and then the control is transferred to the three-dimensional data generation / display section 17 to perform the three-dimensional processing to generate the three-dimensional data ( Step 55). Then, the generated three-dimensional data is drawn on the display device 11 (step 56), and the operator confirms the three-dimensional shape represented by the three-dimensional data (step 57).
It is determined by the operator's judgment whether or not all the operations are allowed to end (step 58). If the operations are allowed to end, all the processing is ended as it is, and if not, the operation returns to step 51 to perform the above operation. repeat.

Next, this embodiment will be further described with a specific example.

FIG. 3 is a diagram for explaining the operation of the process of making a plurality of line segments into one. In this figure, x marks indicate the end points of each line segment, and ∘ marks indicate the end points when one line segment is formed. When a plurality of continuous line segments indicated by thick lines in FIG. 3 (A) are selected, by performing this process,
One line segment indicated by a thick line in (B) is generated. At this time, the line segment before processing indicated by the dotted line is deleted.

By the way, in the edit display device of the present embodiment, as described above, an instruction is input by clicking the icon 71 displayed in the icon display portion 70 provided in a part of the display screen with a mouse or the like. It is supposed to be done. FIG. 4 is a diagram showing a configuration example of the icon display unit 70, and shows that the icons 71 are arranged in the icon display unit 70 for each command type.

FIG. 5 shows an example of the screen display. The screen is roughly divided into an icon display unit 70, a two-dimensional data display unit 72, and a three-dimensional data display unit 73. Although not shown in FIG. 5 and subsequent figures, the icon shown in FIG. 4 is actually displayed in the icon display unit 70. In the two-dimensional data display section 72, a cross-section line (solid line) and a vanishing line (dashed line) extracted from the perspective view of the vehicle seat.
Is displayed. Three-dimensional data calculated from the displayed cross-section line is drawn on the three-dimensional data display unit 73. Here, if an editing operation of changing the direction of the vanishing line 75 and changing the position of the vanishing point by giving an instruction with the cursor 74 of the mouse, a screen display as shown in FIG. 6 is obtained. Here, focusing on the three-dimensional data display section 73, it can be seen that the three-dimensional data calculated changes as the position of the vanishing point changes. In the present embodiment, the three-dimensional data changes in this manner almost in real time with respect to the editing operation.

FIG. 7 to FIG. 9 show an example of screen display when a sketch depicting an automobile is a processing target. The edit display device of the present embodiment can appropriately switch and display vector / point data and image data. In FIG. 7, the original sketch (image data) and cross-section line (vector / point data) can be displayed. ) And vanishing line (vector
(Point data) is displayed on the two-dimensional data display unit 72, and FIG.
Shows the original sketch and the section line.
Cross-section lines and vanishing lines are displayed. In either case,
The created three-dimensional data is displayed on the three-dimensional data display unit 73.

10 and 11 are diagrams for explaining the operation of the vanishing line command. FIG. 10 shows an example of a screen display when a sketch depicting a transceiver is targeted for processing. Here, when the vanishing point command is executed by designating the position with the cursor 74, a straight line 79 (vanishing line) connecting the designated position and each vanishing point is calculated as shown in FIG. 11, and the two-dimensional data is calculated. The two-dimensional data in the display unit 72 is superimposed and displayed. The straight line 79 is effective when referred to when a cross section line is further added.

[0027]

As described above, according to the present invention, when the image data and the vector / point data are superposed, and when the vector / point data is enlarged / reduced, the image data is also reproduced at the same ratio. By enlarging / reducing, it becomes possible to proceed with the work while confirming the original perspective view, so that there is an effect that work efficiency and accuracy can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an edit display device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the edit display device shown in FIG.

FIG. 3 is a diagram for explaining an operation of making a plurality of line segments into one line.

FIG. 4 is a diagram showing a configuration example of an icon display unit.

FIG. 5 is a diagram showing an example of a screen display.

FIG. 6 is a diagram showing an example in which an editing operation is performed on the screen display of FIG.

FIG. 7 is a diagram showing an example of a screen display.

8 is a diagram showing a state in which display of a vanishing line is stopped in the screen display of FIG. 7.

9 is a diagram showing a state where display of image data is stopped in the screen display of FIG. 7.

FIG. 10 is a diagram showing an example of a screen display.

11 is a diagram showing an example of executing a vanishing line command while the screen display of FIG. 10 is being performed.

[Explanation of symbols]

 11 display device 12 output interface unit 13 vector / point data storage unit 14 image data storage unit 15 instruction input unit 16 display output unit 17 three-dimensional data generation display unit 18 vanishing line display unit 19 editing unit 20 line segment changing unit 21 scaling 51-65 Step 70 Icon display 71 Icon 72 Two-dimensional data display 73 Three-dimensional data display

Claims (7)

[Claims] 1. A method for editing and displaying three-dimensional data from two-dimensional data represented by a perspective view, wherein the two-dimensional data comprises image data and vector / point data, and the image data and the A display step of superimposing and displaying vector / point data on the same screen; an editing step of editing the vector / point data; and a calculation based on the vector / point data edited in the editing step. 3D data creating and displaying step of creating 3D data and displaying based on the created 3D data, and enlarging / reducing the image data at the same ratio when enlarging / reducing the vector / point data An edit display method for creating three-dimensional data having a similar transformation step of reducing. 2. The edit display method according to claim 1, wherein the vector / point data corresponds to any one or more of a line segment, a point, a vanishing line and a vanishing point. 3. The edit display method according to claim 2, further comprising a line segment changing step of changing each line segment into one corresponding line segment when a plurality of continuous line segments are selected. 4. The edit display according to claim 1, further comprising a vanishing line display step of displaying at least one vanishing line passing through the position on the screen when a position on the screen is designated. Method. 5. From the perspective view representation of the two-dimensional data, 3
An edit display device for creating three-dimensional data, the first display device storing image data of the two-dimensional data.
Storage means, a second storage means for storing vector / point data of the two-dimensional data, a display screen, the image data and the vector / point with reference to the first and second storage means Display output means for displaying data in a superimposed manner on the display screen, instruction input means for inputting an editing instruction for the vector / point data, and changing the vector / point data according to the editing instruction When the instruction is an enlargement / reduction instruction for the vector / point data, editing means for enlarging / reducing the image data at the same ratio; and 3) performing an operation based on the vector / point data.
An edit display device for creating three-dimensional data, which includes three-dimensional data creation and display means for creating three-dimensional data and displaying the created three-dimensional data on the display screen. 6. The line segment changing unit for changing a plurality of continuous line segments of the vector / point data into a corresponding one line segment, inside the editing unit. Edit display device. 7. The edit display device according to claim 5, further comprising vanishing line display means for obtaining a vanishing line passing through the position indicated by the instruction inputting means and displaying the vanishing line on a display screen.