KR20240048365A - Drawing comparison apparatus and method using text area arrangement shape - Google Patents

Abstract

An apparatus and method for comparing drawings using text area arrangement shapes are disclosed. The drawing comparison device includes a drawing selection unit that selects a drawing before revision and a drawing after revision as design drawing data for detecting revisions among pre-stored design drawing data; a character detection unit that detects characters and their coordinate information in each of the before-revision drawing and the after-revision drawing, and specifies a character area corresponding to each detected character; The character areas specified in the drawing before revision and the drawing after revision are divided into one or more character groups, a character group identifier corresponding to the arrangement shape of the character areas belonging to each character group is set, and the set character group identifier is used. a character group corresponding unit matching character groups in the before-revision drawing and the after-revision drawing with each other; a text area overlapping unit for displaying text groups that match each other in the pre-revision drawing and the post-revision drawing by overlapping each other; And detecting revisions between the pre-revision drawing and the post-revision drawing by comparing the text contents of the text area within the text group of the pre-revision drawing and the text area within the text group of the post-revision drawing, which are displayed overlapping with each other. Includes a revision judgment section.

Description

Drawing comparison apparatus and method using text area arrangement shape}

The present invention relates to a drawing comparison device and method using character area arrangement shapes.

The shipbuilding industry refers to an industry that manufactures, processes, and assembles ships at shipyards for shipping, marine resource development, and military supply procurement. The plant industry supplies facilities to produce products such as chemical materials, power, gas, oil, and fresh water. It is an industry that builds factories.

The shipbuilding and plant industries can be said to be comprehensive industries that include hardware such as machines and equipment, engineering, software, construction, and maintenance to produce results.

For ship manufacturing or plant construction, information management such as drawings, general/changed elements, maintenance history, etc., accurate identification of design changes, and accurate work instructions on site are required.

In general, revisions to design drawings occur frequently in the process of manufacturing ships, etc., and when design drawings are revised, it must be clearly recognized which part of the text (for example, dimensions, specifications, etc. written in the design drawings) has been revised.

Previously, workers such as designers or constructors had to identify revisions manually by comparing design drawings before revision with revised design drawings. However, manually identifying revision tasks not only takes a lot of time, but is also prone to human error.

In order to improve this problem, a drawing comparison system was developed that automatically extracts the characters and coordinate information written in each of the design drawings before revision and the revised design drawings, compares them with each other, and presents revisions.

However, as shown in FIG. 1, the conventional drawing comparison system had the limitation of judging it as a revision because the writing position of the text was changed even when the contents of the design drawing and the text were not changed but only the location.

The matters described in the technical background section of this invention are for understanding the background of the invention, and cannot be assumed to be prior art already known to those skilled in the art in the field to which this technology belongs.

Korean Patent No. 10-2340049

The present invention detects drawing revisions by comparing drawings before revision and drawings after revision, and creates a text area arrangement shape that can detect drawing revisions focusing on changes in character content regardless of changes in the writing position of the characters. The purpose is to provide a drawing comparison device and method using the drawing comparison method.

Problems to be solved other than those of the present invention can be easily understood through the following description.

According to one aspect of the present invention, the design drawing data for detecting revisions among pre-stored design drawing data includes a drawing selection unit that selects a drawing before revision and a drawing after revision, respectively; a character detection unit that detects characters and their coordinate information in each of the before-revision drawing and the after-revision drawing, and specifies a character area corresponding to each detected character; The character areas specified in the drawing before revision and the drawing after revision are divided into one or more character groups, a character group identifier corresponding to the arrangement shape of the character areas belonging to each character group is set, and the set character group identifier is used. a character group corresponding unit matching character groups in the before-revision drawing and the after-revision drawing with each other; a text area overlapping unit for displaying text groups that match each other in the pre-revision drawing and the post-revision drawing by overlapping each other; And detecting revisions between the pre-revision drawing and the post-revision drawing by comparing the text contents of the text area within the text group of the pre-revision drawing and the text area within the text group of the post-revision drawing, which are displayed overlapping with each other. A drawing comparison device including a revision determination unit is provided.

The character detection unit may generate a boundary box defining the character area. In addition, the text area overlapping portion is displayed so that the center point coordinates of the boundary box of the pre-designated reference text area match among the text areas included in the character groups that match each other in the drawing before revision and the drawing after revision. After overlapping or overlapping so that the center point coordinates of the reference text areas match, one character group can be moved up, down, left, and right to display relatively the most text areas overlapping.

If the IOU score calculated by applying the IOU (Intersect Over Union) technique is above a pre-specified threshold, the revision judgment unit determines whether or not the text content has been changed. However, if the IOU score is less than the threshold, the text content is changed. It may be set to determine that it is a revision regardless of whether it is a revision or not.

The revision determination unit may be set to compare text contents of text areas included in the revised drawing that are located closest to each text area included in the drawing before revision.

According to another aspect of the present invention, there is a computer program stored in a computer-readable medium for performing a drawing comparison method, wherein the computer program causes the computer to perform the following steps, wherein the steps include: Detecting characters and their coordinate information from each of the pre-revision drawings and post-revision drawings selected as design drawing data for detecting revisions among the data, and specifying a text area corresponding to each detected character; The character areas specified in the drawing before revision and the drawing after revision are divided into one or more character groups, a character group identifier corresponding to the arrangement shape of the character areas belonging to each character group is set, and the set character group identifier is used. matching character groups in the drawing before revision and the drawing after revision; displaying character groups that match each other in the pre-revision drawing and the post-revision drawing by overlapping them with each other; And detecting revisions between the pre-revision drawing and the post-revision drawing by comparing the text contents of the text area within the text group of the pre-revision drawing and the text area within the text group of the post-revision drawing, which are displayed overlapping with each other. A computer program stored on a computer-readable medium including the steps is provided.

Other aspects, features and advantages in addition to those described above will become apparent from the following drawings, claims and detailed description of the invention.

According to an embodiment of the present invention, drawing revisions are detected by comparing drawings before revision and drawings after revision, and drawing revisions can be detected focusing on whether the text content has changed regardless of the change in the position of the text. , This has the effect of maximizing the user’s work convenience.

The effects that can be obtained from the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below. will be.

1 is a diagram showing an example in which the display positions of design drawings and characters have been changed.
Figure 2 is a schematic block diagram of a drawing comparison device according to an embodiment of the present invention.
3 and 4 are diagrams illustrating a process for identifying revisions based on the text area arrangement shape of the drawing comparison device according to an embodiment of the present invention.
Figure 5 is a diagram illustrating a method of applying the IOU technique to determine whether a character has been revised according to an embodiment of the present invention.
Figure 6 is a flowchart showing a drawing comparison method using the text area arrangement shape according to an embodiment of the present invention.

Since the present invention can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention.

Figure 2 is a schematic block diagram of a drawing comparison device according to an embodiment of the present invention, and Figures 3 and 4 are a process of identifying revisions based on the text area arrangement shape of the drawing comparison device according to an embodiment of the present invention. This is a drawing to explain, and Figure 5 is a drawing to explain a method of applying the IOU technique for determining whether a character has been revised according to an embodiment of the present invention.

Referring to FIG. 2, the drawing comparison device 100 includes a drawing selection unit 101, a character detection unit 103, a character group correspondence unit 105, a text area overlapping unit 107, and a revision determination unit 109. It can be included.

Here, each detailed component (eg, character detection unit 103, etc.) of the drawing comparison device 100 may be configured as a type of module that performs a designated role. Here, the module may be implemented in software form, implemented in hardware configuration such as FPGA (Field Programmable Gate Array) or application specific integrated circuit (ASIC), or a combination thereof. Of course, the module is not limited to software or hardware, but may be configured to reside on an addressable storage medium, and may be configured to execute one or more processors. The functionality provided by components and modules may be combined into fewer components and modules or may be further separated into additional components and modules.

The drawing selection unit 101 selects two design drawing data for which revisions need to be detected by comparing them with each other from among the design drawing data previously stored in the database 150.

The two design drawing data selected by the drawing selection unit 101 are design information about the design drawing for detecting revisions, and as illustrated in (a) of FIG. 3, they are consecutive to each other for the same design object. It may be design information of design drawings of revision serial numbers.

At this time, when the drawing after revision (i.e., a design drawing with a relatively late revision number) is compared with a drawing before revision (i.e., a design drawing with a relatively early revision number), the location and content of the written characters are the same as the design drawing. However, one or more of its location and contents may have been modified.

The character detection unit 103 detects characters and their coordinate information in each of the pre-revision drawing and the post-revision drawing selected by the drawing selection unit 101, and specifies the text area 210 corresponding to each written character.

For example, the text area 210 may be specified as a boundary box (eg, a rectangular box) divided to include the written text in the inner area. As illustrated in (b) of FIG. 3 , when a plurality of characters are written to be spaced apart from each other in a design drawing, a plurality of character areas 210 may also be detected and individually identified. Extracting text and its coordinate information from design drawing data is self-evident to those skilled in the art, so detailed description thereof will be omitted.

The character group response unit 105 sets the character areas 210 detected in each of the drawings before and after revision into a character group based on the detected position information, and the arrangement shape of the text areas 210 belonging to the character group. Sets a character group identifier so that it can be identified by this shape or symbol.

In addition, the character group corresponding unit 105 recognizes character group identifiers corresponding to each other between the drawing before revision and the drawing after revision, and matches the character group for which revisions are to be determined in the drawing before revision and the drawing after revision.

As illustrated in (c) of FIG. 4, the character group response unit 105 may set the character areas 210 detected in the pre-revision drawing and the post-revision drawing respectively into one or more character groups. For example, the character group corresponding unit 105 recognizes the center point coordinates of each character area 210, and selects the text areas 210 where the distance between the center point coordinates of adjacent text areas 210 is less than or equal to a predetermined threshold value. It can be pre-specified to be set to the same character group.

In addition, as illustrated in (c) of FIG. 4, the character group corresponding unit 105 connects the center points of adjacent character areas 210 for character areas 210 belonging to the same character group. The character group identifier of the figure shape may be set and may be pre-designated to match character group identifiers with relatively high similarity in the drawing before revision and the drawing after revision.

In (c) of FIG. 4, a first character group identifier and a third character group identifier that have similar shapes may be matched, and a second character group identifier and a fourth character group identifier may be matched. Here, since the method of calculating shape similarity between character group identifiers of various shapes is self-evident to those skilled in the art, detailed description thereof will be omitted.

In (c) of FIG. 4, a case where the character group identifier is set in the shape of a closed figure in which the center points of adjacent character areas 210 are connected to each other is illustrated, but the coordinates of the center points of the character areas 210 belonging to the same character group are used. Therefore, there can be various ways to set the character group identifier of a figure or symbol shape.

The character area overlapping portion 107 is positioned so that corresponding text areas 210 within character groups whose character group identifiers match each other in the drawing before revision and the drawing after revision are displayed in an overlapping manner.

As illustrated in (d) of FIG. 4, the text area overlapping portion 107 coincides with the center points of the text area 210 designated as the reference text area in the corresponding character groups in each of the drawings before and after revision. If possible, groups of characters that correspond to each other can be overlapped.

Here, the reference text area is, for example, a text area (e.g., the position of the upper left vertex, etc.) among the text areas 210 belonging to corresponding character groups in each of the drawings before revision and the drawing after revision. 210).

Of course, the character area overlapping unit 107 primarily overlaps character groups using a reference character area, and then moves one character group up, down, left, and right so that the most character areas 210 overlap each other. As a result, the character areas 210 of corresponding character groups in the drawing before revision and the drawing after revision may overlap.

As described above, since the character areas 210 belonging to corresponding character groups in the drawing before revision and the drawing after revision are overlapped using the coordinates of the center point of the text area 210, the drawing comparison device according to the present embodiment ( 100) has the advantage of being able to effectively respond to cases where the design drawings and text positions in the drawing are adjusted overall after revision.

The revision determination unit 109 determines whether the text areas 210 corresponding to each other in the character groups of the overlapping drawings before and after revision are revised.

At this time, the revision determination unit 109 recognizes the text area 210 included in the drawing after revision that is located closest to the text area 210 included in the drawing before revision, and determines the text area 210 included in each text area 210. Whether or not there has been a change in the text content can be used to determine whether or not it has been revised.

That is, as illustrated in Figure 3 (a) and Figure 4 (d), the letters ABC, HIJ, FGH, etc. in the drawing before revision are 1 with the letters ABT, HIJ, FKK, etc. in the drawing after revision, which are located closest to each other. :1 can be used, and the letters ABC and FGH in the drawing before revision can be judged to correspond to revisions (i.e. revised to ABT and FKK, respectively). Here, the method of determining whether contrasting text contents are identical is obvious to those skilled in the art, so detailed explanation thereof will be omitted.

In addition, when determining revision matters, the revision determination unit 109 measures the area of the overlapping portion between the boundary boxes defining the character area 210 and divides it by the area of the union of the overlapping areas (IOU). ) technique can be further applied (see Figure 5).

If the IOU score according to the IOU technique is greater than or equal to a pre-specified threshold (for example, 0.5), the revision determination unit 109 determines whether or not the text content has been changed. However, if the IOU score is less than the threshold, the text content is changed. It can be preset to be judged as a revision regardless of whether there is a change or not.

As in the case of the letter HIJ illustrated in FIG. 3, the text content (i.e., HIJ) is maintained as a position corresponding to each other in the drawing before revision and the drawing after revision, but the position of the object to be explained has changed, so the actual revision matter To be able to effectively prepare for cases such as

Information on revisions determined by the revision determination unit 109 may be organized according to a pre-designated output format and provided to the user.

As described above, the drawing comparison device 100 according to the present embodiment detects drawing revisions by comparing the drawing before revision with the drawing after revision, focusing on whether the text content has changed regardless of the change in the writing position of the text. It has the feature of detecting drawing revisions.

Figure 6 is a flowchart showing a drawing comparison method using the text area arrangement shape according to an embodiment of the present invention.

Referring to FIG. 6, in step 610, the drawing comparison device 100 selects two design drawing data for which revisions need to be detected by comparing them with each other from among the design drawings pre-stored in the database 150 (see FIG. 3 (see (a)).

For example, the drawing comparison device 100 may select a pre-revision drawing and a post-revision drawing as design information of consecutively revised design drawings for the same design object.

In step 620, the drawing comparison device 100 extracts text and coordinate information of the text from each of the selected drawings before and after revision, and specifies the text area 210 corresponding to each written character (in FIG. 3). see b)).

For example, the text area 210 may be specified as a boundary box (eg, a rectangular box) divided to include the text written in the design drawing in the inner area.

In step 630, the drawing comparison device 100 sets the text areas 210 detected in each of the pre-revision and post-revision drawings into a text group based on the detected location information, and sets the text areas 210 belonging to the text group. Set the character group identifier so that the arrangement shape of the letters is identified by a figure or symbol (see (c) of FIG. 3).

Thereafter, the drawing comparison device 100 recognizes character group identifiers corresponding to each other between the drawing before revision and the drawing after revision, and matches the character group for which revisions are to be determined in the drawing before revision and the drawing after revision (see FIG. 3 (see (c)).

For example, the drawing comparison device 100 refers to the center point coordinates of each detected text area 210, and refers to the text area 210 where the distance between the center point coordinates of the adjacent text area 210 is less than or equal to a predetermined threshold. ) can be pre-specified to be set to the same character group.

In addition, the drawing comparison device 100 sets a character group identifier for character areas 210 belonging to the same character group, such as a figure shape in which the center points of adjacent text areas 210 are connected to each other, and sets the character group identifier before revision. Character group identifiers with relatively high similarity in the drawing and the drawing after revision may be designated in advance to match each other.

In step 640, the drawing comparison device 100 positions corresponding character areas 210 within character groups whose character group identifiers match each other in the drawing before revision and the drawing after revision so that they are displayed in an overlapping manner.

At this time, the character groups corresponding to each other may be designated in advance to be overlapped so that the center points of the character areas 210, which are pre-designated as the reference character areas in each character group, coincide with each other.

Alternatively, after first overlapping the character groups using the reference character area, move any one character group up, down, left, and right so that the most text areas 210 overlap each other, drawing before revision and after revision. The character areas 210 of corresponding character groups in the drawing may be designated in advance to be overlapped.

In step 650, the drawing comparison device 100 determines whether the text areas 210 corresponding to each other in the character groups of the overlapping drawings before and after revision are revised.

Here, the drawing comparison device 100 recognizes the text area 210 included in the revised drawing that is located closest to the text area 210 included in the drawing before revision, and the text area 210 included in each text area 210 is located closest to the text area 210 included in the drawing before revision. It can be set to determine whether or not there is a revision based on whether or not the text content has changed.

In addition, the drawing comparison device 100 determines whether to revise the IOU based on whether the text content has changed when the IOU score calculated by applying the IOU (Intersect Over Union) technique is greater than or equal to a pre-specified threshold (for example, 0.5). If the score is below the threshold, it may be preset to determine that it is a revision regardless of whether the text content has changed.

It goes without saying that the drawing comparison method using the above-described character area arrangement shape can be implemented as a software program or application built into a digital processing device and performed as an automated procedure in a time-serial order. Codes and code segments constituting the program, etc. can be easily inferred by a computer programmer in the field. Additionally, the method can be implemented by storing the program in a computer readable information storage medium and reading and executing it by a computer.

Although the present invention has been described above with reference to embodiments, those skilled in the art can make various modifications and changes to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You will understand that you can do it.

100: drawing comparison device 101: drawing selection unit
103: Character detection unit 105: Character group response unit
107: Character area overlapping part 109: Revision judgment part
150: database 210: character area

Claims (5)

Design drawing data for detecting revisions among pre-stored design drawing data, including a drawing selection unit that selects a drawing before revision and a drawing after revision, respectively;
a character detection unit that detects characters and their coordinate information in each of the before-revision drawing and the after-revision drawing, and specifies a character area corresponding to each detected character;
The character areas specified in the drawing before revision and the drawing after revision are divided into one or more character groups, a character group identifier corresponding to the arrangement shape of the character areas belonging to each character group is set, and the set character group identifier is used. a character group corresponding unit matching character groups in the before-revision drawing and the after-revision drawing with each other;
a text area overlapping unit for displaying text groups that match each other in the pre-revision drawing and the post-revision drawing by overlapping each other; and
A revision for detecting revisions between the drawing before revision and the drawing after revision by comparing the text contents of the text area within the text group of the drawing before revision and the text area within the text group of the drawing after revision, which are displayed overlapping with each other. A drawing comparison device including a determination unit. According to paragraph 1,
The character detection unit generates a boundary box defining the character area,
The text area overlapping part,
Overlapping processing is performed so that the coordinates of the center point of the boundary box of a pre-designated reference character area among the character areas included in each matching character group in the drawing before revision and the drawing after revision are overlapped and displayed, or
A drawing comparison device that overlaps the reference text areas so that their center point coordinates match, and then moves one text group up, down, left, and right so that relatively the most text areas are overlapped and displayed. According to paragraph 2,
If the IOU score calculated by applying the IOU (Intersect Over Union) technique is above a pre-specified threshold, the revision judgment unit determines whether or not the text content has been changed. However, if the IOU score is less than the threshold, the text content is changed. A drawing comparison device that is set to determine whether or not it is a revision. According to paragraph 2,
The above revision judgment department
A drawing comparison device set to compare text contents of text areas included in the drawing after revision that are located closest to each text area included in the drawing before revision. A computer program stored on a computer-readable medium for performing a drawing comparison method, the computer program causing a computer to perform the following steps, the steps comprising:
Detects text and character coordinate information in each of the pre-revision drawings and post-revision drawings selected as design drawing data for detection of revisions among pre-stored design drawing data, and specifies the text area corresponding to each detected character. step;
The character areas specified in the drawing before revision and the drawing after revision are divided into one or more character groups, a character group identifier corresponding to the arrangement shape of the character areas belonging to each character group is set, and the set character group identifier is used. matching character groups in the drawing before revision and the drawing after revision;
displaying character groups that match each other in the pre-revision drawing and the post-revision drawing by overlapping them with each other; and
Detecting revisions between the before-revision drawing and the after-revision drawing by comparing the text contents of the text area within the text group of the before-revision drawing and the text area within the text group of the after-revision drawing, which are displayed overlapping with each other. A computer program stored on a computer-readable medium containing a.