JPH0239381A - System for extracting three-dimensional coordinate from two-dimensional perspective drawing - Google Patents

Abstract

PURPOSE:To extract three-dimensional coordinate data at high speed and exactly from a two-dimensional perspective drawing by deriving a reverse perspective conversion by using a rectangular parallelepiped. CONSTITUTION:By a reverse perspective conversion processor 3, a rectangular parallelepiped 8 can change freely length of three sides, and also, based on a perspective conversion, a parameters such as a position of a visual point, an eye direction, a position of a plane of projection, etc. can be changed freely. The rectangular parallelepiped 8 obtained in such a way and image data 7 are superposed and displayed, an when a length change of three edge lines and a free perspective conversion are added to the rectangular parallelepiped by the reverse perspective conversion processor 3, the edge line of the rectangular parallelepiped 8 can be allowed to coincide with the edge line of the image data 7. A rectangular parallelepiped 9 shows a rectangular parallelepiped which has coincided in such a way. The determination of the rectangular parallelepiped 9 is equivalent to a fact of deriving a reverse perspective conversion of the image data 7, therefore, when a deriving a reverse perspective executed by various parameters of the perspective conversion which is derived at this time, the image data 7 can be handled as if it is three-dimensional shape data.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a three-dimensional coordinate extraction system. The present invention relates to a system for estimating the three-dimensional coordinates of each part of.

Conventional technology Conventionally, the method of determining the three-dimensional coordinates of an object from a two-dimensional perspective drawing is to find the vanishing point based on the perspective drawing, and use that to find the three-dimensional coordinates of each part by drawing and proportional calculation. was the only way.

Problems to be Solved by the Invention In the conventional method described above, drawings are made on perspective drawings, so 1.
When drawing is repeated, the lines become sloppy and complicated.One drawback is that the workability is very poor and accuracy is reduced.

Furthermore, since proportional calculation is required in addition to drawing, there is a drawback that it requires a large amount of man-hours. Furthermore, in order to draw the diagram, it is necessary to write the vanishing point on the perspective drawing, but I! If the vanishing point is far away compared to the size of the 21 plane, it may be virtually impossible to draw it.

This is a major drawback of this method.

The present invention has been made in view of the above-mentioned conventional situation,
Therefore, an object of the present invention is to provide a novel three-dimensional coordinate extraction system that makes it possible to eliminate the above-mentioned drawbacks inherent in the conventional techniques.

Means for Solving the Problems In order to achieve the above object, the system for extracting three-dimensional coordinates from a two-dimensional perspective view according to the present invention includes a scanner that reads a two-dimensional perspective view as image data, and a perspective transformation of nuclear image data. a probe processor that extracts three-dimensional coordinates from the image data based on the inverse perspective transformation; and a three-dimensional coordinate file that stores the extracted three-dimensional coordinates.

A CPU that controls the scanner, inverse perspective transformation processor, globe processor, and 13-dimensional coordinate file.
It is composed of:

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a block diagram showing one practical example of the present invention.

Referring to FIG. 1, reference number 1 indicates a two-dimensional perspective view, and this two-dimensional perspective view 1 is read by a scanner 2 as image data. The image data read into the CPU 6 is subjected to inverse perspective transformation by the inverse perspective transformation processor 3. Inverse perspective transformation can be obtained as follows using perspective transformation.

Details of perspective transformation can be found in the literature (S, P, Morse,
A Mathematical Model for
The Analysis of Contour
-I,ine Data, Journaloft
he As5ociat ion for C
ng Machinery, Vol. 15, Teeth, 2.

April 1968, PP, 205-220)
Ic is described. Figure 2 shows the principle of inverse perspective transformation.

In FIG. 2, 7 is image data of the two-dimensional perspective view 1 displayed on the display of the CPU 6. 8 is a rectangular parallelepiped similarly displayed on the display of the CPU 6 by the inverse perspective transformation processor 3.

The lengths of the three sides of the rectangular parallelepiped 8 can be freely changed by the inverse perspective transformation processor 3, and furthermore, parameters such as the position of the viewpoint, the line of sight direction, and the position of the projection plane can be freely changed based on the perspective transformation of the above-mentioned document. The rectangular parallelepiped 8 obtained in this way and the image data 7 are superimposed and displayed 1-1.If the inverse perspective transformation processor 3 changes the length of the three ridge lines and performs arbitrary perspective transformation on the rectangular parallelepiped 8, the wires of the rectangular parallelepiped 8 can be changed to the image shown in screen 10. can be made to match the ridgeline of the image data 7. Rectangular parallelepiped 9. Hail the rectangular parallelepiped when they match like that. Determining the rectangular parallelepiped 9 is equivalent to determining the inverse perspective transformation of the image data 7, so the various parameters of the perspective transformation determined at this time It can be treated like

Therefore, the first step is to generate a globe 11 having a three-dimensional position on the ridge line of the rectangular parallelepiped 9 using the globe processor 4, as shown in FIG. By.

Three-dimensional coordinates on the image data 7 can be determined. For example, to find the position of point 12, arrow 13,
By moving the probe 11 in the directions 14, 15, and 16, it is possible to reach one point 12 and obtain its three-dimensional coordinates.

In this way, the three-dimensional coordinates of the necessary points on the image data 7 are determined, and the results are stored in the three-dimensional coordinate file 5.

DETAILED DESCRIPTION OF THE INVENTION As described in detail, according to the present invention, three-dimensional coordinate data can be extracted quickly and accurately from a two-dimensional perspective view by obtaining inverse luck-view transformation using a rectangular parallelepiped. is obtained.

Another advantage of the present invention is that it can be easily configured with a PC-level CPU, requiring less investment.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an example of the present invention;
The figure is a principle diagram showing the principle of obtaining inverse perspective transformation as an example of the present invention, and FIG. 3 is a principle diagram showing the procedure for extracting three-dimensional coordinates from a two-dimensional perspective view according to the present invention. DESCRIPTION OF SYMBOLS 1... Two-dimensional perspective view, 2... Scanner, 3... Inverse perspective transformation processor, 4... Probe processor, 5
...3D coordinate file, 6...CPU, 7...
Image data of a two-dimensional perspective view, 8... Rectangular parallelepiped for determining inverse perspective transformation, 9... Rectangular parallelepiped when determining inverse perspective transformation, 10... Rectangular parallelepiped 8.9 and image data 7 are displayed in an overlapping manner. Screen, 11...Glove by probe processor 4, 12...Let's find the three-dimensional coordinates, Point on the image data 7 that is being bound, 13...Arrow that shows the movement of the probe to find point 12 , 15...Arrow indicating the movement of the probe to find point 12, 1
6...Arrow motion of the glove to obtain point 12 Patent Applicant: Agent for NEC Co., Ltd.

Claims (1)

[Claims] a scanner that reads a two-dimensional perspective view as image data; an inverse perspective transformation processor that obtains parameters for determining perspective transformation of the image data; and a probe processor that extracts three-dimensional coordinates from the image data based on the inverse perspective transformation. From a two-dimensional perspective view, comprising a three-dimensional coordinate file that stores the extracted three-dimensional coordinates, the scanner, a reverse perspective transformation processor, a probe processor, and a CPU that controls the three-dimensional coordinate file. 3D coordinate extraction system.