JPH10162034A - Method for generating cad data from image data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate CAD data from only necessary information without recognizing slight distortion of a line by recognizing line information, specific point information, etc., of image data on an inputted graphic and then generating CAD data on the graphic on the basis of those pieces of information. SOLUTION: An arithmetic control circuit 1a reads in a program of an information recording and reproducing device 7 and starts controlling CAD data generation from the image data. Firstly, the graphic is read in or photographed by an image scanner 9 or video camera 10. The read-in image data are structured in a frame memory 5 and an image of the structured graphic is displayed on a monitor television 2. Line information, specific point information, size information, scale information, etc., are read out of the image data. Then, a graphic is structured in the frame memory 5 according to information stored in a CAD data memory 6 and displayed on the monitor television 2, and then CAD data on the structured graphic are recorded in the information recording and reproducing device 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for converting image data into CAD data by recognizing specific information in input image data of the graphic and generating CAD data of the graphic from the recognized information. is there.

[0002]

2. Description of the Related Art Conventionally, as a method of converting graphic image data into CAD data, there is a method disclosed in, for example, Japanese Patent Application Laid-Open No. 4-18682. In the CAD method of image data disclosed in this publication, a figure in a design drawing is read by an image scanner and input to a microcomputer, and the microcomputer converts all line segment data of the image data into CAD data. .

[0003]

However, in this method, since a line is recognized as a set of points, for example,
When an originally linear line is read by an image scanner, the line may be read in a slightly distorted state.
When such a distorted line is CAD, there is a problem that 100% of the CAD figure data cannot be used because the line becomes jagged in the distorted portion.

Accordingly, an object of the present invention is to provide a CAD method of image data which can create CAD data only from necessary information without recognizing such a slight distortion of a line. .

[0005]

In order to achieve the above object, according to the present invention, an image of a graphic is inputted to an arithmetic means by an image input means, and line information in the inputted image data of the graphic, After the specific point information, the dimensional information, and the scale information are recognized by the arithmetic means, CAD data of the graphic is created by the arithmetic means based on the recognized information. I do.

According to this method, unnecessary point information between specific points is not recognized for CAD data. Moreover, even if there is a distortion in the line between the specific points, the distortion itself is not converted into CAD data. Therefore, when a graphic is rendered from the CAD data, the rendered graphic has no distortion at the time of reading. State.

The invention of claim 2 is characterized in that the specific point information is a point, an end point of a line, a vertex of a figure, an intersection of a plurality of lines, and the like. As a result, only the minimum necessary points need to be recognized as the specific point information for the CAD data, so that the information amount of the CAD data is reduced, and the recording capacity is also advantageous when recording the CAD data. Becomes

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 2, reference numeral 1 denotes a personal computer main body (hereinafter abbreviated as a personal computer main body), 2 denotes a monitor television (display device) mounted on the personal computer main body 1, 3
Is a keyboard, and 4 is a mouse. This PC body 1
The operation control circuit 1a (operation means) shown in FIG.
Keyboard 3 and mouse 4 are connected.

Further, the arithmetic control circuit 1a is connected to a frame data memory 5, a CAD data memory 6, and an information recording / reproducing device 7, such as a hard disk or a magneto-optical disk device, and a printer 8 (output device). It is connected.

An image scanner 9 and a television camera 10 are connected to the arithmetic and control circuit 1a as image input means. In the information recording / reproducing apparatus 7, a program for reading an image of a design drawing or the like by the image scanner 9 and the television camera 10 and converting the read image data of the design drawing or the like into CAD data is recorded. ing.

Next, the function of the arithmetic control circuit 1a having such a configuration will be described together with a method of converting image data into CAD.

When a power supply (not shown) of the personal computer is turned on,
The arithmetic control circuit 1a reads the program of the information recording / reproducing device 7 and starts controlling the conversion of image data such as design drawings into CAD data.

Step S1 In this step, it is determined whether the design drawing 11 (graphic) as shown in FIG. 3 has been read by the image scanner 9, or whether the design drawing 11 has been photographed by the television camera 10. Is determined, and if image data has not been read, step S1 is looped, and if image data has been read, the flow proceeds to step S2.

Step S2 In this step, the read image data is constructed in the frame data memory 5, the constructed graphic image is displayed on the screen 2a of the monitor television 2 as shown in FIG. I do. In FIG. 3, reference numeral 11a denotes a figure in the design drawing.

Step S3 In this step, from the image data of the figure 11a 'constructed in the frame data memory 5, "(1) line information broken line, dashed line, dashed line, solid line (thin line, thick line) (2) identification Point information Points, end points of lines, vertices of figures, intersections of multiple lines, arcs (3) Dimension information Numerical values shown in thin lines (4) Scale information Predetermined design specifications at the lower right of design drawings The numerical value described in the position is read, and the process proceeds to step S4.

That is, in this step, the monitor TV 2
FIG. 11a ′ displayed on the screen 2a of FIG.
The addresses of the corners P1, P2, P3, P4, P5, and P6 are read as the end points and intersections of the lines L1, L2, L3, L4, L5, and L6 and stored in the CAD data memory 6 and the lines L1 L6 is read as a thick line and stored in the CAD data memory 6.

Also, dimensional lead lines a1, a of the figure 11a '
2, a3, a4, a5, a6, a7, etc. are determined, and dimension lead lines a1, a2, a3, a4, a4, a5,
Numerical values 150, 80, 70, 75 (mm) between a6, a7 are CA as the dimensions (length) of the lines L1, L2, L4, L3.
While being stored in the D data memory 6, the scale 尺度 of the predetermined position, ie, the lower right part of the design specification, is read as scale information and stored in the CAD memory 6. After all the information has been read in this way, the process proceeds to step S4. If the line is an arc, the radius of curvature of the arc and the address of the center of curvature of the arc are obtained and stored in the CAD data memory 6.

Steps S4 and S5 In this step S4,
After the graphic 11a 'as shown in FIG. 5 is constructed in the frame memory 5 from the information stored in the CAD memory 6 and displayed on the screen 2a of the monitor television 2, the CAD data of the graphic constructed in step S4 is stored in step S5. To record on the information recording / reproducing device 7, and the processing is terminated.

At the time of reading the design drawing 11,
Since the design drawing 11 is partially distorted, the lines L2, L4, and L6 are read distorted as shown in FIG. 4, but when constructing the graphic 11b in this step, the lines L2, L4
4, L6 can be an undistorted straight line. This is because the lines L2, L4, and L6 between the points P2 and P3, between P4 and P5, and between P6 and P1 are not used as the point (aggregate) data. Further, a graphic based on the CAD data constructed in step S4 can be printed by the printer 8.

In the embodiment described above, an example has been shown in which the points P1 to P6 are automatically recognized, but the present invention is not necessarily limited to this. For example, the points P1 to P6 may be designated by the cursor mark 4a operated by the mouse 4, and the addresses of the designated points P1 to P6 may be recorded in the CAD data memory 6.

After the addresses of the points P1 to P6 are automatically read in step S3 as described above,
In order to clarify the read points P1 to P6, a mark such as a square or a circle is automatically added to the points P1 to P6 on the graphic 11a displayed on the screen 2a of the monitor television 2. Is also good. In this case, the portions within the points P1 to P6 that have been marked are unread portions. Therefore, in this case, a point which is not marked among the points P1 to P6 is designated by the mouse 4, and
The address of the designated point may also be stored in the CAD data memory 6. In addition, the scale information is stored on the keyboard 3
Can be input to the arithmetic and control circuit 1a.

[0023]

As described above, according to the first aspect of the present invention, an image of a graphic is input to the arithmetic means by the image input means, and the line information, the specific point information, and the size in the input image data of the graphic are input. After the information and the scale information are recognized by the calculating means, the CAD data of the figure is created by the calculating means based on the recognized information. Therefore, unnecessary point information between specific points is converted into the CAD data. To never recognize. Moreover, even if there is a distortion in the line between the specific points, the distortion itself is not converted into CAD data. Therefore, when a graphic is rendered from the CAD data, the rendered graphic has no distortion at the time of reading. State.

According to the second aspect of the present invention, since the specific point information is a point, an end point of a line, a vertex of a figure, an intersection of a plurality of lines, and the like, it is necessary as specific point information for CAD data. Only the minimum points need to be recognized. As a result, the information amount of the CAD data is reduced, which is advantageous in recording the CAD data in terms of the recording capacity.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a control circuit used for a method of converting image data into CAD according to the present invention.

FIG. 2 is an explanatory diagram of a CAD apparatus for image data provided with the control circuit shown in FIG. 1;

FIG. 3 is an explanatory drawing of a design drawing showing an example of converting the image data into CAD data by the CAD method according to the present invention.

FIG. 4 is an explanatory diagram showing an example when the design scanner of FIG. 3 is read by the image scanner or the television camera shown in FIG. 2 and displayed on a monitor television.

FIG. 5 is an explanatory diagram when CAD data is constructed from the figure read in FIG. 4;

FIG. 6 is a flowchart showing functions of a control circuit shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Personal computer main body 1a ... Operation control circuit (arithmetic means) 2 ... Monitor television (display means) 9 ... Image scanner (image input means) 10 ... Television camera (image input means)

Claims (2)

[Claims] 1. An image of a figure is input to an operation means by an image input means, and line information, specific point information, dimensional information, and scale information in the input image data of the figure are recognized by the operation means. A method for generating CAD data of the graphic by the calculating means based on the recognized information. 2. The method according to claim 1, wherein the specific point information includes a point, an end point of a line, an apex of a figure, an intersection of a plurality of lines, and the like.