JPH08137937A - Method and device for recognizing working code in cad system - Google Patents

Abstract

PURPOSE: To automatically and directly recognize a working signal to which working information is annexed from inputted graphic data by individually extracting a working signal expressing a working hole and working information annexed to the working signal from inputted graphic data and allowing both the extracted data to correspond to each other by retrieving processing. CONSTITUTION: A CPU 2 includes a 1st extracting means 4 for extracting a leading line and a comment characters entered into the leading line from inputted graphic data, a 2nd extracting means 5 for extracting a graphic pattern of a working code expressing a working hole from the graphic data, a discriminating means 6 for discriminating working information from the comment characters extracted by the means 4, and a retrieving means 7 for retrieving the same graphic pattern as a working code corresponding to the working information discriminated by the means 6. Thereby a working code to which working information is annexed can be automatically and directly recognized from the inputted graphic data in any kind of CAD systems.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machining symbol recognition method and apparatus for a CAD system capable of automatically and directly recognizing a machining symbol representing a machining hole or the like from graphic data used in a CAD system. .

[0002]

2. Description of the Related Art Generally, CAD (computer-aided design)
If the system model is different, there is no compatibility of graphic data,
Graphic data cannot be directly exchanged. Therefore, conventionally, in preparation for the case of exchanging data between different CAD systems, there are specified some intermediate file formats in which different CAD software can commonly refer to graphic elements such as line segments and arcs used in CAD. . The intermediate file is an IGES (Initial Graphics Exchange Specif) which is a standard for graphic data defined by ANSI (American National Standards Institute).
ication) format and DX, which is a data exchange format for personal computer CAD software developed by Autodesk, Inc.
The F (Drawing Interchange File) format and the like are known.

[0003]

However, in the conventional method using such an intermediate file, a figure which is not defined in the format of the intermediate file, for example, information for drilling a hole such as a drill or a tap is provided. Cannot be converted. In addition to the hole dimensions, it is common to add the machining method, the total number of the same holes, etc. to the symbol representing the hole.
It is desired to be able to recognize the machining symbol of the hole in a form corresponding to such information portion.

In relation to this point, there is a method of performing pattern recognition to restore the information lost in the intermediate file.
There is a problem that the system lacks flexibility because it is necessary to predict the hole machining symbol and the information to be added to it in advance and register all necessary patterns.

The present invention has been made in view of the problems of the prior art as described above, and it is possible to select from among the graphic data used in the CAD system without previously registering a machining symbol with additional information. An object of the present invention is to provide a machining symbol recognition method and a machining symbol recognition apparatus in a CAD system capable of automatically and directly recognizing a machining symbol representing a machining hole or the like.

[0006]

In order to achieve the above object, a method of recognizing a machining symbol in a CAD system according to a first aspect of the present invention is such that a machining hole or the like is selected from graphic data used in the CAD system. A method of recognizing a machining symbol to be expressed, which is a step of extracting a leader line and an annotation character written therein from input graphic data, and a graphic pattern of a machining symbol representing a machining hole or the like from the graphic data. The same as the processing symbol corresponding to the processing information determined in the previous step from the figure pattern extracted in the previous step, and the step of extracting the processing information from the annotation character extracted in the previous step. And a step of searching for a figure pattern.

The machining symbol recognition method in the CAD system according to claim 2 is the CAD according to claim 1 described above.
In the method of recognizing a machining symbol in the system, the step of searching for the same graphic pattern as the machining symbol corresponding to the machining information includes the step of adding the positional information of the retrieved graphic pattern to the corresponding machining information and registering it as CAD data. It is characterized by including.

A machining symbol recognizing device in a CAD system according to claim 3 is a device for recognizing a machining symbol representing a machining hole or the like from graphic data used in the CAD system, and in the inputted graphic data. The first extraction means for extracting the leader line and the annotation character written therein, the second extraction means for extracting the graphic pattern of the machining symbol representing the machining hole or the like from the graphic data, and the first extraction means. A discrimination unit that discriminates the processing information from the extracted annotation characters and a graphic pattern that is the same as the processing symbol corresponding to the processing information that is discriminated by the determination unit from the graphic patterns extracted by the second extraction unit. And a search means for searching.

The machining symbol recognition apparatus in the CAD system according to a fourth aspect is the machining symbol recognition apparatus in the CAD system according to the third aspect, wherein the searching means corresponds to the machining information corresponding to the position information of the retrieved graphic pattern. And is registered as CAD data.

[0010]

The CAD according to claim 1, which is configured as described above.
In the method of recognizing a machining symbol in the system, a leader line and an annotation character written in the leader line are extracted from the input graphic data, and a machining symbol graphic representing a machining hole or the like is extracted from the graphic data. After the pattern is extracted and the processing information is determined from the annotation characters extracted in the previous step, the same pattern pattern as the processing symbol corresponding to the processing information determined in the previous step from the figure patterns extracted in the previous step To search. That is, a machining symbol representing a machining hole or the like and machining information added thereto are separately extracted from the input graphic data, and both are associated later by a retrieval process.
Therefore, in any kind of CAD system,
It is possible to automatically and directly recognize the processing symbol with the processing information added from the input graphic data.

Further, in the method of recognizing a machining symbol in the CAD system according to the second aspect, since the position information of the retrieved figure pattern is added to the corresponding machining information and registered as CAD data, it is represented by the machining symbol. The processed data can be centrally managed and recognized.

Further, in the machining symbol recognition apparatus in the CAD system according to the third aspect, the first extracting means extracts the leader line and the annotation character written therein from the inputted graphic data, and the second extracting means The extracting means extracts a graphic pattern of a machining symbol representing a machining hole or the like from the graphic data, the discriminating means discriminates the machining information from the annotation character extracted by the first extracting means, and the searching means, From among the graphic patterns extracted by the second extracting means,
The same graphic pattern as the processing symbol corresponding to the processing information discriminated by the discriminating means is searched. That is, a machining symbol representing a machining hole or the like and machining information added thereto are separately extracted from the input graphic data, and both are associated later by a retrieval process. Therefore, in any type of CAD system, it is possible to automatically and directly recognize the processing symbol with the processing information added thereto from the input graphic data.

Further, in the machining symbol recognition apparatus in the CAD system according to the fourth aspect, the retrieval means adds the positional information of the retrieved graphic pattern to the corresponding machining information and registers it as CAD data. The processed data represented by can be centrally managed and recognized.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a functional configuration of a processed symbol recognition device of the present invention. This machining symbol recognition device is a CA
A device for automatically recognizing a machining symbol representing a machining hole or the like (hereinafter, a machining symbol representing a machining hole will be described as an example) from the graphic data used in the D system. A graphic data file 1 that is incorporated in a CAD (computer-aided design) system and stores graphic data such as an input drawing, a CPU 2 that performs various calculations based on the input data, and various data used in the CAD system. A CAD data file 3 for storing (CAD data). CPU2
Is a first extracting means 4 for extracting the leader line and the annotation characters written in the leader line from the input graphic data (drawing).
Second extracting means 5 for extracting a graphic pattern of a machining symbol representing a machining hole from the graphic data, discriminating means 6 for discriminating machining information from the annotation characters extracted by the first extracting means 4, (2) Retrieval means 7 for retrieving the same figure pattern as the machining symbol corresponding to the machining information discriminated by the discriminating means 6 from the figure patterns extracted by the extracting means 5. The search means 7 also has a function of adding the position information of the searched graphic pattern to the corresponding processing information and registering it as CAD data in the CAD data file 3. More detailed functions of the first extracting unit 4, the second extracting unit 5, the discriminating unit 6, and the searching unit 7 will be apparent when the flowcharts of FIGS. 2 to 6 are described later. The graphic data includes position information of graphic elements.

Next, the operation of the machining symbol recognition apparatus or the method of recognizing the machining symbol will be described with reference to the flow charts of FIGS. It should be noted that FIGS. 7 to 10 are appropriately referred to.

FIG. 2 is a main flow chart schematically showing the operation of the CPU 2. Here, the case of recognizing a drawing (graphic data) as shown in FIG. 7 is taken as an example. When the program starts, first, the first extraction means 4 reads the input graphic data (see the drawing of FIG. 7) from the graphic data file 1, and from the read graphic data, the leader line and the annotation written therein. All characters are extracted (step S1). Next, the second extracting means 5 extracts all the graphic patterns of the machining symbols representing the machining holes from the same graphic data (in the present embodiment, this is called an isolated small graphic, as will be described later) ( Step S
2). Then, the discriminating means 6 performs the first step S1.
The processing information is discriminated from the annotation characters extracted by the extracting means 4 (step S3), and further, in the searching means 7, from the isolated small figures extracted by the second extracting means 5 in step S2, in step S3. An isolated small figure having the same figure pattern as the machining symbol corresponding to the machining information discriminated by the discrimination means 6 is searched (step S4). After that, it is determined whether or not there is an unprocessed comment character that has not been subjected to the processes of step S3 and the following, among the comment characters extracted by the first extracting means 4 in step S1 (step S
5) If there is any unprocessed comment character, the process returns to step S3, and the processes from step S3 are repeated until there are no unprocessed comment characters. The process of step S1 and the process of step S2 may be performed in reverse order, or may be performed simultaneously in parallel.

FIG. 3 is a flowchart of the leader line extraction processing in step S1 of FIG. This processing is executed by the first extracting means 4 as described above. As shown in FIG. 8, the leader line is a polygonal line (consisting of two line segments Ea3 and Ea4) and an arrow (consisting of two short line segments Ea1 and Ea2).
And the annotation character is a character string Ea5 written in a predetermined position.

First, in order to extract the leader line, an unextracted line segment in the drawing (see FIG. 7) is appropriately extracted, and Ea1 (where a is a parameter indicating the extraction number of the leader line) is extracted. (Step S10). In the present embodiment, the already-extracted line segment is stored to that effect by, for example, a flag. Next, it is judged whether or not the length of the extracted line segment Ea1 is equal to or less than the normal value A that defines the length of the arrow (step S11), and the length of the line segment Ea1 is the specified value A.
If it is larger than the above, it is determined that it is not an arrow portion and the process returns to step S10. In addition, preferably, the size of the prescribed value A is set to be slightly larger in consideration of an error, an individual difference, and the like.

On the other hand, if the length of the line segment Ea1 is less than or equal to the specified value A as a result of the determination in step S11, the line segment Ea
All line segments having one end point P1 of a1 as an end point are extracted (step S12), and it is determined whether the number of extracted line segments is two (step S13). If the number of lines extracted as a result of this determination is not two, it is determined that the line segment Ea1 is not an arrow portion, and the process returns to step S10.

On the other hand, if the number of lines extracted as a result of the determination in step S13 is two, the extracted two line segments are appropriately set as Ea2 and Ea3 (step S1).
4) It is determined whether or not one of the lengths is equal to or less than the specified value A and the other length is larger than the specified value A (step S15). If the above conditions are not satisfied as a result of this determination, it is determined that the line segment Ea1 is not an arrow portion, and the process returns to step S10.

On the other hand, if the above condition is satisfied as a result of the determination in step S15, the line segment Ea1 is determined to be the arrow portion, and the line segment E set in step S14 is determined.
The shorter one of a2 and Ea3 is corrected to Ea2, and the longer one is corrected to Ea3 (step S16). In the drawing of FIG. 8, one of the line segments forming the arrow of the leader line is Ea1 and the other is Ea2, but this does not mean to distinguish the two line segments. E
The line segment represented by a1 and Ea2 may be opposite to that shown in FIG.

Then, the other end point of the line segment Ea3 is set to P
2 (step S17), all line segments having the end point P2 as the end point are extracted (step S18), and it is determined whether or not the number of extracted line segments is one (step S19).
If the number extracted as a result of this judgment is not one,
When it is determined that the line is not a leader line, the process returns to step S10.

On the other hand, if the number of lines extracted as a result of the determination in step S19 is 1, the extracted line segment is E
A4 is set (step S20), and it is determined whether or not the line segment Ea4 is horizontal (step S21). If the line segment Ea4 is not horizontal as a result of this determination, it is determined that it is not a leader line and the process returns to step S10. Note that step S
The order of the process of 20 and the determination of step S21 may be reversed.

As a result of the determination in step S21, the line segment E
If a4 is horizontal, it is determined to be a leader line and the line segment Ea4
A character string within a predetermined distance B from is extracted (step S22), and it is determined whether or not there is a character string (step S23). If there is no character string as a result of this judgment,
It is determined that the information of the annotation character does not exist, and step S10
Return to The distance B, which is the reference for the extraction process in step S22, is a normal distance defined between the horizontal line segment of the leader line and the character string written on the leader line. Preferably,
The size of the extraction distance B is set to be slightly larger in consideration of errors and individual differences.

On the other hand, if there is a character string as a result of the determination in step S23, the extracted character string is Ea5 (step S24), and the line segments Ea1 to Ea4 and the character string Ea5 extracted so far are drawn out. Then, after registration as an annotation character in an internal memory (not shown) (step S25), it is determined whether or not extraction of all the leader lines is completed depending on the presence or absence of unextracted line segments (step S26). If all the extractions have not been completed as a result of this determination, step S1
Returning to 0, the series of processing from step S10 is repeated until the extraction of all the leader lines and the annotation characters on the drawing is completed.

FIG. 4 is a flowchart of the isolated small figure extraction process of step S2 of FIG. This processing is executed by the second extracting means 5 as described above. Note that FIG.
In the example of FIG.
0, 12, 14, 16, and 18 are written. Among them, the machined holes 10 and 12 are the same hole, and the machined hole 1
Since 4, 16 and 18 are the same holes, they are represented by the same symbols.

First, from the drawing (see FIG. 7) read from the graphic data file 1, a graphic element (line segment,
(Circle, arc) are appropriately extracted and used as Ek (where k is a parameter representing the extraction number) (step S30). In the present embodiment, as in the case of step S1 described above, the already extracted graphic elements are converted by, for example, a flag.
The fact is stored. Next, the size of the extracted graphic element Ek is a preset value C set in advance.
(For example, C = 10 mm) or less is determined (step S31), and the size of the graphic element Ek is the specified value C.
If it is larger than the above, it is determined that it is not a graphic element forming the machining symbol, and the process returns to step S30. The size of the prescribed value C is a standard for extracting the graphic elements that form the machining symbol, and is set appropriately by the user in consideration of the actual size of the symbol shown in the drawing. It is possible. In the example of FIGS. 7 and 9, the machined holes 10, 1
2 is represented by a symbol composed of two intersecting line segments, and the machined holes 14, 16 and 18 are represented by a symbol composed of two concentric circles.

If the size of the graphic element Ek is equal to or less than the specified value C as a result of the judgment in step S31, it is judged that the graphic element constitutes the machining symbol and the extracted graphic element E is determined.
Set a square area of dimension C × C (C is the above specified value) around the center (midpoint) of k and set it as Rk (see FIG. 9).
(Step S32). In the example of FIG. 9, five processed holes 1
Five square regions R1, R2, R3, R4 and R indicated by broken lines in the figure respectively corresponding to 0, 12, 14, 16 and 18
5 is set. The k of Rk indicating the region is a parameter indicating the extraction number as described above, and the correspondence between the processed hole and the region Rk is not limited to the illustrated case.

Next, the region R set in step S32
Extract all the graphic elements existing in k and Ek them
, ..., Ekn (where n is the total number of extracted graphic elements) (step S33). In the example of FIG. 9, since two graphic elements (line segments or circles) exist in each of the regions R1 to R5, n = 2 in each case.

Then, the graphic elements Ek1, ..., Ekn (n = 2 in the example of FIG. 9) extracted in step S33 are grouped as an isolated small graphic and set as εk (step S3).
4). The extracted small isolated figure εk is registered in an internal memory (not shown). Here, the isolated small figure is a figure pattern of a machining symbol that represents a machining hole, and is composed of several small figure elements. For example, as described above, the symbols for the machined holes 10, 12 are composed of two intersecting line segments, and the symbols for machined holes 14, 16, 18 are composed of two concentric circles. Note that k of εk showing an isolated small figure
Is a parameter indicating the extraction number, as in the case of Rk indicating a region, and the correspondence between the processed hole and the isolated small figure εk is not limited to the case shown in the figure.

Then, it is judged whether or not there is any unextracted graphic element in the drawing (step S35). If there is any unextracted graphic element, the process returns to step S30 to extract all the isolated small figures. A series of processes from step S30 onward are repeated until the end.

FIG. 5 is a flow chart of the processing information discrimination processing in step S3 of FIG. This processing is executed by the discrimination means 6 as described above.

First, the annotation characters extracted in step S1 of FIG. 2 are read out from the memory of the first extracting means 4, and the number of processed holes, processing diameter, and processing type are discriminated from the read out annotation characters (step S40). Based on the result, it is determined whether or not the processing information is written (step S41).
If there is no processing information as a result of this determination, the process immediately proceeds to step S5 of FIG. 2 in order to interpret the next annotation character. It should be noted that the annotation character indicating the processing information is usually composed of information of the number of processed holes, the processing diameter, and the processing type (or method) as shown in FIG.

On the other hand, if there is processing information as a result of the determination in step S41, the leading end of the leader line in which the processing information is written is selected from the isolated small figures registered in the memory of the second extracting means 5. The isolated small figure before P0 is extracted (step S42), and it is determined whether or not there is an isolated small figure based on the result (step S43). If there is no isolated small figure as a result of this judgment, it is judged that it is not processing and the process immediately proceeds to step S5 of FIG. 2 in order to interpret the next annotation character. On the other hand, if there is an isolated small figure as a result of the determination in step S43, the isolated small figure extracted in step S42 is regarded as a machining symbol (step S4).
4).

FIG. 6 is a flow chart of the processing symbol retrieval process of step S4 of FIG. This processing is executed by the search means 7 as described above. First, only one isolated small figure is appropriately extracted from the isolated small figures extracted in step S2 of FIG. 2 (step S50), and the step S of FIG.
It is determined whether the figure pattern is the same as the machining symbol set in 44 (step S51). If the result of this determination is not the same, the process immediately proceeds to step S53.
If they are the same, the center coordinates of the isolated small figure extracted in step S50 are stored as a processing position in an internal memory (not shown) (step S52). And the above process,
Until there are no unextracted isolated small figures (step S53)
repeat. As a result, all the isolated small figures having the same figure pattern as the machining symbol set in step S44 of FIG. 5 are extracted.

Next, the number of isolated small figures retrieved in the processing of steps S50 to S53, that is, the number of retrieved machining holes is the number of machining holes in the machining information determined in step S40 of FIG. If the number of holes is not the same as a result of this determination (step S54), error processing such as issuing an error display instruction is performed (step S55), and then the process returns.

On the other hand, if the number of holes is the same as a result of the determination in step S54, the hole position information stored in step S52 is added to the machining information determined in step S40 of FIG. Is registered in the CAD data file 3 as (step S56), and the process returns. As a result, all the same holes having the machining information commonly determined in step S40 of FIG. 5 are recognized as CAD data.

Then, until there are no unprocessed annotation characters as described above, step S3 (see the flowchart of FIG. 5) and step S4 (see the flowchart of FIG. 6) of FIG.
By repeating the above process, all the processing symbols on the drawing are associated with the processing information. That is, all machining symbols on the drawing are recognized.

Therefore, according to the present embodiment, the machining symbol representing the machining hole and the machining information attached to the machining symbol are separately extracted from the input graphic data, and the two are associated later by the retrieval process. In any type of CAD system, regardless of the drafting method or type of CAD system, it is not necessary to register the machining symbols such as drills and taps in advance, and machining symbols with machining information added from the input graphic data. Can be directly recognized automatically.

Further, since the isolated small figure is extracted and used as a search target, the processing symbol can be searched efficiently.

In the present embodiment, the machining symbol representing the machining hole has been described as an example, but the invention is not limited to this, and the invention is a machining symbol defined by a leader line on which information is written. Of course, it can be applied to anything.

[0042]

As described above, according to the machining symbol recognition method of the first aspect of the present invention, the machining symbol representing the machining hole and the machining information attached to the machining symbol are input from the inputted graphic data. Since they are extracted separately and are associated with each other later by a search process, regardless of the drafting method or the type of CAD system, in any type of CAD system, the processing information is added from the input graphic data. The symbols can be automatically recognized directly.

Further, according to the machining symbol recognition method of the second aspect, the positional information of the retrieved graphic pattern is added to the corresponding machining information and registered as CAD data.
It is possible to centrally manage and recognize the machining data represented by the machining symbol.

Further, according to the machining symbol recognition apparatus of the third aspect, the machining symbol representing the machining hole and the machining information attached thereto are separately extracted from the inputted graphic data, and both are later extracted by the retrieval process. Since it is made to correspond to each other, it is possible to automatically and directly recognize the machining symbol with the machining information added from the inputted graphic data in any type of CAD system regardless of the drawing method or the type of CAD system. .

According to the machining symbol recognition apparatus of the fourth aspect, the positional information of the retrieved graphic pattern is added to the corresponding machining information and registered as CAD data. Therefore, the machining data represented by the machining symbol is unified. Can be managed and recognized in a physical manner.

[Brief description of drawings]

FIG. 1 is a block diagram showing a functional configuration of a processed symbol recognition apparatus of the present invention.

FIG. 2 is a main flowchart that schematically shows the operation of the CPU.

FIG. 3 is a flowchart of the leader line extraction processing of FIG.

FIG. 4 is a flowchart of the isolated small figure extraction process of FIG.

FIG. 5 is a flowchart of processing information determination processing in FIG.

FIG. 6 is a flowchart of the processing symbol search processing of FIG.

FIG. 7 is a diagram showing an example of a drawing in which a processed hole is described.

FIG. 8 is a diagram for explaining a leader line extraction process.

FIG. 9 is a diagram for explaining the isolated small figure extraction process.

FIG. 10 is a diagram for explaining processing information determination processing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Graphic data file 2 ... CPU 3 ... CAD data file 4 ... 1st extraction means 5 ... 2nd extraction means 6 ... Discrimination means 7 ... Search means 10, 12, 14, 16, 18 ... Machining hole

Claims (4)

[Claims] 1. A method for recognizing a machining symbol representing a machining hole or the like from graphic data used in a CAD system, wherein a leader line and an annotation character written therein are extracted from the inputted graphic data. A step of extracting a figure pattern of a machining symbol representing a machining hole or the like from the figure data, a step of discriminating the machining information from the annotation character extracted in the previous step, and a figure pattern extracted in the previous step And a step of retrieving the same graphic pattern as the machining symbol corresponding to the machining information determined in the previous step from among the above steps, and a machining symbol recognition method in a CAD system. 2. The step of retrieving a figure pattern that is the same as the machining symbol corresponding to the machining information includes the step of adding position information of the retrieved figure pattern to the corresponding machining information and registering it as CAD data. A method for recognizing a machining symbol in a CAD system according to claim 1. 3. A device for recognizing a machining symbol representing a machining hole or the like from graphic data used in a CAD system, which extracts a leader line and an annotation character written therein from the inputted graphic data. 1 extracting means, 2nd extracting means for extracting a graphic pattern of a machining symbol representing a machining hole or the like from the graphic data, and a discriminating means for discriminating machining information from the annotation characters extracted by the 1st extracting means. A search means for searching the graphic pattern extracted by the second extraction means for the same graphic pattern as the processing symbol corresponding to the processing information discriminated by the discrimination means. Machining symbol recognition device in system. 4. The machining symbol recognition device in a CAD system according to claim 3, wherein the retrieval means adds position information of the retrieved graphic pattern to corresponding machining information and registers it as CAD data.