JPH0950513A - Method for inputting drawing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drawing inputting method capable of improving working efficiency for obtaining a superposed picture of drawings. SOLUTION: In the case of obtaining a multiple picture for plural mutually related drawings by a drawing input device for inputting a drawing to a computer as an image, recognizing and editing the image and converting the processed image into vector data, another related drawing is inputted by an image scanner (S1), the already inputted vector data are read out and converted into a vector picture (S2), the vector picture is compared with the picture of the other drawing to correct the distortion of the picture (S3), and the distortion- corrected picture is saved in a file (S4). Then the vector data are converted into a vector picture (S5) and exclusive OR between the stored picture of the other drawing and the vector picture is found out to obtain a multiple picture. Then a difference between the vector picture and the picture of the other drawing is found out, the histogram of the picture is prepared and a picture to be deleted is judged from the peak value of the histogram.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention reads a drawing into a computer as an image, recognizes and edits it, and then executes CA.
The present invention relates to a drawing input device for converting D data (vector data), and more particularly to a drawing input method for obtaining multiple images of CAD data and drawings related thereto.

[0002]

2. Description of the Related Art A drawing input device is for reading an image such as a drawing or a document with an image scanner or the like to obtain image data suitable for handling by CAD or the like, and ensures simplicity in handling by CAD or the like. It is important to compress the data while doing so. Image vectorization processing is an image processing technology that satisfies these points.

In image processing by image vectorization processing,
A contour vector is generated using the binary image data read by an image scanner or the like, and a core line vector is further generated. There is also a method of directly generating thin line approximation vector data from binary image data. Using the vector data obtained in this way, the elements (characters, line segments, etc.) that make up the image are separated and recognized, and the recognition results are combined and edited.

As a method of using the drawing information possessed by this kind of drawing input device, there is a case where a multiple image of a plurality of drawings is obtained. For example, a building plan and its equipment drawings (such as piping and wiring diagrams) may be displayed in an overlapping manner, or a distribution system diagram and a road map of the city area may be displayed in an overlapping manner.

In order to obtain a superimposed image of the drawings, for example, even if the building floor plan has already been input as CAD data, in order to eliminate the occurrence of misalignment with the building floor plan when inputting the facility drawing. Are typing together.

[0006]

In the conventional method for obtaining a superimposed image of a drawing, the drawing is re-input even though one of the drawings has already become CAD data.
For example, even when the floor plan of the building has already become CAD data, the floor plan has to be re-entered to be recognized and edited, resulting in poor work efficiency.

An object of the present invention is to provide a drawing input method which improves the working efficiency in obtaining a superimposed image of drawings.

[0008]

According to the present invention, the CAD data already stored is converted into its vector image, and the existence of the image is judged from the exclusive OR or difference with another read image or the histogram. By obtaining the multiple image by deleting the data, it is not necessary to re-input the drawing converted into the CAD data, and the following method is used.

(First Invention) The present invention is to obtain a multiple image of a plurality of drawings related to each other by using a drawing input device for reading a drawing as an image into a computer, performing recognition and editing, and converting it into vector data. An image scanner reads another drawing related to the drawing made into the vector data, and compares the read image of the other drawing with the vector image obtained by reading and converting the vector data to correct the distortion of the read image. The image data is temporarily stored in a drawing input device, the vector data is read out and converted, and the vector image obtained by the conversion and the stored image of another drawing are exclusive-ORed to obtain a multiple image.

(Second Invention) The present invention is to obtain a multiple image of a plurality of drawings which are related to each other by using a drawing input device which reads a drawing as an image into a computer, recognizes and edits it, and converts it into vector data. An image scanner reads another drawing related to the drawing made into the vector data, and compares the read image of the other drawing with the vector image obtained by reading and converting the vector data to correct the distortion of the read image. The image data is temporarily stored in a drawing input device, the vector image is read out and converted, and the difference between the stored vector image and the stored image of another drawing is taken to obtain a multiple image.

(Third Invention) According to the present invention, in obtaining a multiple image of a plurality of drawings associated with each other by using a drawing input device for reading a drawing as an image into a computer, performing recognition and editing, and converting it into vector data, An image scanner reads another drawing related to the drawing made into the vector data, and compares the read image of the other drawing with the vector image obtained by reading and converting the vector data to correct the distortion of the read image. Once stored in the drawing input device, the vector data is read out and the image portion of the other drawing is deleted when the stored image of the other drawing exists at a position corresponding to each vector of the converted vector image. It is characterized by obtaining multiple images.

(Fourth Invention) Whether or not there is an image of the other drawing saved at a position corresponding to each vector is determined by creating a histogram of the image and judging from the magnitude of its peak value. Characterize.

(Fifth Invention) In deleting the image portion of the other drawing, a histogram is created in a direction orthogonal to the image to be deleted, and the image to be deleted leaving the peak portion of the histogram. Is to be deleted.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a procedure diagram of an input method showing an embodiment of the present invention. The present embodiment shows a case where an equipment drawing is overlaid on a building plan that has already been saved as CAD data (vector data).

First, the equipment drawing is input to the image scanner (S1).

Next, an image obtained by converting the CAD data of the building floor plan into a vector diagram is read on the input image of the equipment drawing (S2). For both of these images, the image distortion correction function is used to correct the overlapping position of the equipment drawing image and the CAD data of the building floor plan (S3), and the corrected equipment drawing image is temporarily saved in a file (S4). ).

Next, the CAD data of the building plan is read again, and each vector image of this CAD data is converted into a vector image with the same line width as the building portion of the image of the equipment drawing (S5). This image data and the image saved in the file in step S4 are XORed (exclusive OR) to delete the body diagram portion of the building plan (S6).

Therefore, in the present embodiment, the equipment drawing is read, the distortion of the equipment drawing is corrected by using the CAD data and saved, the CAD data is converted into an image, and the CAD data is superimposed by the XOR operation with the equipment drawing. Images can be obtained. In this embodiment, the work of re-inputting the building plan is unnecessary.

FIG. 2 shows another embodiment of the present invention. The difference between FIG. 1 and FIG. 1 lies in that instead of step S6, the difference between the corrected equipment drawing image and the vector image of the CAD data converted into the image is obtained (S7).

In step S7, A is the image data of the facility drawing and B is the image data of the building plan.
The difference is obtained by calculating d (not B), and a superimposed image display is obtained.

Also in this embodiment, it is possible to improve work efficiency by eliminating the need to re-enter the building plan.

FIG. 3 shows another embodiment of the present invention. The processes S1 to S3 in the figure are the same as in the case of FIG. 1 or FIG.

Next, the CAD data image of the floor plan of the building is compared with the image data of the equipment drawing, and when there is an equipment drawing image corresponding to an arbitrary vector image of the CAD data, the image data is deleted (S8). ~ S12).

This series of processing is to delete the overlapping portion between the vector image of CAD data and the image of equipment drawing, and the correspondence between the vector image of CAD data and the equipment drawing image is created by creating a histogram of the image. To do. These processes will be described in detail below.

An arbitrary vector image of CAD data is selected (S8), and the histogram of the image of the equipment drawing below this vector image is taken (S9). FIG. 4 shows an example in which the vector images A1 and A2 of the CAD data of the building plan and the image B of the equipment drawing are displayed in an overlapping manner, and when the vector image A1 is selected, the image B of the equipment drawing that overlaps with the vector image A1 is selected.
5A, the histogram value of this superposed image has a certain width in the width direction of the vector image to form a histogram.

Next, with respect to the created histogram, it is detected whether or not the peak value of the histogram is higher than a set value (S10), and it is assumed that an image exists in a portion having a high peak value, and the vector image is the most vector image among the portions. The equipment drawing image having a close peak value is deleted (S11).

For example, for the partial image of FIG. 5 (a), the histogram values are as shown in FIG. 5 (b),
Delete the equipment drawing image that is closest to the vector image.

In this image deletion, assuming that the line width to be deleted is constant, if the line width to be deleted is too large, FIG.
As you can see, the image of the equipment drawing is completely deleted. Also, if the line width to be deleted is narrowed, the lines on the equipment drawing will remain without being deleted.

Therefore, in the present embodiment, as the deletion line width, the width of the peak of the histogram value closest to the vector image in the histogram is detected, and the width is set as the deletion line width. This example is shown in FIG. 6B, and the appropriate line width is deleted.

This series of processing is performed for all the vectors (S12), and the vector image of the building plan and the image of the equipment drawing are displayed in an overlapping manner.

Also in this embodiment, the work efficiency can be improved by eliminating the need to re-enter the building plan.

In the embodiment shown in FIG. 3, the overlapping portion of the vector image of the CAD data and the image of the equipment drawing is deleted, and the equipment drawing image is linearly formed for one line segment of the CAD data. In order to delete, as shown in FIG. 7 (a), when the image of the building plan to be deleted intersects with the facilities / pipes to be left, some of the facilities / pipes are missing, Unnecessarily missing portions occur as shown in FIG.

The present embodiment is a method for eliminating the loss of this image, and the histogram creation processing (S9) in FIG.
A histogram is created with a certain width centered on the center of the deletion target image and in a direction orthogonal to the deletion target image, and the target image is deleted in the image deletion processing (S11) leaving the peak portion of this histogram. .

Image deletion by this method is performed, for example, with reference to FIG.
(A), and when the image to be left and the image to be deleted are orthogonal, as shown by the broken line block,
A histogram is created in the orthogonal direction (image direction to be left) for the image to be deleted. This histogram is
As shown in (b) of the figure, since the peak portion is the position of the image to be left, the image to be deleted is deleted while leaving the portion of the position. As a result, as shown in (c) of the figure, the image to be left also has a portion orthogonal to the image to be deleted, and the loss of the image is eliminated.

Therefore, according to the present embodiment, the CAD
When deleting the overlapping portion of the vector image of the data and the image of the equipment drawing, it is possible to reliably prevent the loss of the image to be left due to the deletion of the image to be deleted.

[0036]

As described above, according to the present invention, another drawing related to a drawing made into vector data is read by an image scanner, and this read image and already input vector data are read and converted. The distortion of the read image is corrected by comparing it with the vector image, and the existence of the image is determined from the exclusive OR or difference between the vector image of the vector data and the image of another drawing, or the histogram, and the deletion is performed. Since the multiple images are obtained by performing the operation, there is an effect that the re-input of the drawing converted into the CAD data is unnecessary and the work efficiency is improved.

Further, when deleting the overlapping portion between the vector image and the image of another drawing, the peak portion of the histogram of the image to be deleted is removed, so that it is certain that the image to be left will be missing. Can be prevented.

[Brief description of drawings]

FIG. 1 is a processing procedure diagram showing an embodiment of the present invention.

FIG. 2 is a processing procedure diagram showing another embodiment of the present invention.

FIG. 3 is a processing procedure diagram showing another embodiment of the present invention.

FIG. 4 is an example in which a plan view of a building and equipment drawings are superimposed and displayed.

FIG. 5 is an example of creating a histogram in the embodiment.

FIG. 6 is an example in which a deletion line width of a superimposed image is changed.

FIG. 7 is an example in which an image to be deleted is missing due to an image to be deleted.

FIG. 8 is a deletion example showing another embodiment of the present invention.

[Explanation of symbols]

 A1, A2 ... Vector image of vector data. B ... Image of equipment drawing.

Claims (5)

[Claims] 1. Obtaining multiple images of a plurality of drawings that are related to each other by using a drawing input device that reads a drawing as an image into a computer, recognizes and edits it, and converts it into vector data. Another related drawing is read by an image scanner, the read image of the other drawing is compared with the vector image obtained by reading and converting the vector data, the distortion of the read image is corrected, and the result is temporarily stored in the drawing input device. A method for inputting a drawing, wherein an exclusive OR of a vector image obtained by reading and converting the vector data and an image stored in the other drawing is obtained to obtain a multiple image. 2. In obtaining a multiple image of a plurality of drawings related to each other by using a drawing input device which reads a drawing as an image into a computer, recognizes and edits it, and converts it into vector data, in the drawing converted into the vector data, Another related drawing is read by an image scanner, the read image of the other drawing is compared with the vector image obtained by reading and converting the vector data, the distortion of the read image is corrected, and the result is temporarily stored in the drawing input device. A drawing inputting method, wherein a multiple image is obtained by obtaining a difference between a vector image obtained by reading and converting the vector data and an image of the other stored drawing. 3. When obtaining a multiple image of a plurality of drawings related to each other by using a drawing input device which reads a drawing as an image into a computer, recognizes and edits it, and converts it into vector data, the drawing converted into the vector data is obtained. Another related drawing is read by an image scanner, the read image of the other drawing is compared with the vector image obtained by reading and converting the vector data, the distortion of the read image is corrected, and the result is temporarily stored in the drawing input device. When the stored image of another drawing exists at a position corresponding to each vector of the vector image obtained by reading and converting the vector data, an image portion of the other drawing is deleted to obtain a multiple image. The drawing input method. 4. Whether or not there is an image of the other drawing saved at a position corresponding to each vector is determined by creating a histogram of the image and judging from the magnitude of its peak value. The drawing input method according to item 3. 5. When deleting an image part of the other drawing, a histogram is created in a direction orthogonal to the image to be deleted, and the image to be deleted is deleted leaving the peak part of the histogram. 4. The method according to claim 3,
How to enter drawings.