KR20150063703A - A Method for Block Inspection of a Vessel Using Augmented Reality Technology - Google Patents

Abstract

The present invention relates to a method for inspecting the block of a vessel using the augmented reality technology of a mobile terminal including a camera and a display and communicating with a server via a mobile communication network. The method for inspecting the block of a vessel using augmented reality technology comprises the steps of: (a) allowing the mobile terminal to photograph an image through the camera, receive the same and identify a part (hereinafter referred to as target part); (b) allowing the mobile terminal to transmit the identification information of the target part to the server and requesting and receiving the three-dimensional model shape data of the target part and a part to be assembled to the target part (hereinafter referred to as a part to be assembled); (c) allowing the mobile terminal to display, on the display, the photographed image of the target part and the three-dimensional model shape of the target part in the alignment; (d) allowing the mobile terminal to display, on the display, the three-dimensional model shape of the part to be assembled in alignment with the three-dimensional model shape of the target part; and (e) allowing the mobile terminal to inspect whether or not each three-dimensional model shape displayed on the display matches the photographed image to determine whether or not the three-dimensional model shape is in alignment. According to the method for inspecting the block of a vessel, the complexity of an inspector aligning a three-dimensional model can be reduced greatly by aligning and contrasting actual assembled parts with the shape of the three-dimensional model.

Description

Technical Field [0001] The present invention relates to a method of block inspection of a ship based on augmented reality,

A three-dimensional (3D) model shape of the part is picked up by a camera using an augmented reality, and a three-dimensional (3D) model shape To a block inspection method for a ship based on an augmented reality.

In general, augmented reality (Augmented Reality) creates a new environment by combining a real world that the user sees with a virtual world that has additional information. The augmented reality system that fuses the real environment with the virtual environment has been under development in the US and Japan since the late 1990s. Augmented reality, a concept that complements the real world with a virtual world, uses a virtual environment created by computer graphics, but the protagonist is a real environment. Computer graphics serve to provide additional information needed for the real world.

Particularly, it is general that recently used mobile devices are equipped with cameras, and the use of wireless communication and augmented reality through such mobile devices is increasing. As an example, the augmented reality of smart media technology has a function to reinforce additional information that is difficult to obtain only in the real world by synthesizing three-dimensional objects on the real-time image base of real world in the smart terminal. In other words, it has a differentiability to construct a real-time service suitable for a user by supplementing the real world by superimposing a virtual object on the real world by the image displayed on the smartphone camera while moving, and provides a better sense of reality to the user .

The augmented reality with this technology is used for the digital contents production such as the game, and is attracting attention as the next generation display technology suitable for the ubiquitous environment and smart media technology. In addition, such augmented reality is also applied to navigation of a ship or navigation system [Patent Literatures 2 and 3].

On the other hand, if augmented reality technology is applied to the traditional shipbuilding industry, it will enable high quality production / drying, innovation of production process by utilizing electronic drawings, cost reduction and profitability enhancement using it.

A ship is made up of a myriad of parts, one of which is associated with another. The relationship between these parts and components is described in the design drawing, and each drying process is performed as defined in these design drawings and is completed after the quality inspection is performed.

In particular, the block inspection is an important verification process for determining the quality of the ship by judging whether the last updated design has been properly installed and manufactured as planned in the part to be constructed in the drying stage of the block.

However, in the conventional block inspection method, various two-dimensional (2D) drawings are printed on paper, and contents written on the drawings and actual installed and manufactured contents are visually inspected. Since the assembled physical parts are three-dimensional shapes and the drawings are displayed in a two-dimensional diagram such as a plan view, a front view, and a side view, it is difficult and time-consuming to confirm the contents of the drawings and the actual assembled state of the components.

In addition, work errors and classification errors occur, leading to a decline in productivity. In addition, due to the special nature of the shipbuilding industry, which is a kind of multi-product, there is a cost loss and inefficiency due to the large number of drawings that are rarely recycled.

That is, since a large number of many kinds of parts are complicatedly assembled, the inspector must be skilled enough to accurately obtain a three-dimensional shape with only a complicated two-dimensional drawing.

In addition, since a conventional block inspection method based on a two-dimensional (2D) drawing must refer to a large amount of two-dimensional drawing, it takes a long time to inquire information.

[Patent Document 1] Korean Published Patent Application No. 10-2012-0090866 (published on August 17, 2012) [Patent Document 2] Korean Published Patent Application No. 10-2011-0116842 (published on October 26, 2011) [Patent Document 3] Korean Patent No. 10-1241638 (Announcement of Mar. 31, 2013)

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems, and it is an object of the present invention to provide a three-dimensional (3D) Dimensional (3D) model shape of a ship based on the augmented reality of the ship.

Particularly, it is an object of the present invention to provide a method of inspecting a block of an augmented reality-based ship, in which a real part of an object to be inspected is indicated by a marker, and only a joined part to be coupled within a specific radius is displayed.

According to an aspect of the present invention, there is provided a method for inspecting a ship's augmented reality vessel based on a mobile terminal having a camera and a display and communicating with a server through a mobile communication network, the method comprising the steps of: (a) Capturing and inputting, and identifying one component (hereinafter referred to as a target component) in the image; (b) the mobile terminal transmits identification information of the target part to the server, thereby requesting and receiving 3D model shape data of the target part and a part (hereinafter referred to as an assembly part) to be assembled with the target part; (c) the mobile terminal aligning the captured image of the target part with the 3D model shape of the target part and displaying it on the display; (d) the mobile terminal aligning a 3D model shape of the assembly part with a 3D model shape of the object part and displaying the 3D model shape on the display; And (e) the mobile terminal determines whether or not the 3D model shape of the assembly part displayed on the display is matched or mismatched, by checking whether each of the 3D model shapes matches the photographed image.

In addition, the present invention is characterized in that, in the augmented reality-based ship block inspection method, in the step (a), identification information of the target part is recognized by recognizing a marker attached to the target part.

Further, the present invention is a method for inspecting a block of a ship based on an augmented reality, wherein in the step (b), the server transmits only a 3D model shape of parts assembled within a predetermined radius from the target part.

In the step (b) of the present invention, it is preferable that the mobile terminal has a radius (hereinafter referred to as a second radius) larger than the first radius at a predetermined radius (first radius) To the server, 3D model shape data of a part that is assembled within a radius larger than the first radius and smaller than the second radius is additionally requested and received from the server.

According to another aspect of the present invention, there is provided a method for inspecting a block of a vessel based on an augmented reality, the method comprising the steps of: (a) extracting a feature point of a corner or a face from a photographed image of the target part, And matches with the minutiae points of the model shape.

According to another aspect of the present invention, there is provided a method for inspecting a vessel based on an augmented reality-based ship, the method comprising the steps of: (a) And matching the 3D model shape of the part.

According to another aspect of the present invention, there is provided a method for inspecting a ship in an augmented reality-based ship, the method comprising the steps of: (d) extracting, from the 3D photographing shape of the target part, And 3D model shapes of the assembly part are matched according to the position, the viewpoint, and the size, and are displayed on the display.

According to another aspect of the present invention, there is provided a method for inspecting a block of a ship based on an augmented reality, the method comprising the steps of: (e) extracting a feature point of a corner or a face from a photographed image of the assembly part, The feature point of the 3D model of the assembled part is matched with the feature point of the 3D model to judge whether the match or mismatch exists.

Further, the present invention provides a method for inspecting a block of a ship based on an augmented reality, wherein, in the step (e), the mobile terminal inputs a match or an incoincidence of each 3D model shape of the assembled part .

Further, the present invention is a method for inspecting a block of a vessel based on an augmented reality, wherein in the step (e), the mobile terminal sequentially highlights the surroundings of each shape in the display for each 3D model shape of the assembly part And when the input of matching or mismatching of the inspector comes in, it is determined that matching or mismatching of the assembled parts of the highlighted shape is made.

The method further includes the steps of: (f) determining whether the assembled part determined to be incompatible in the step (e) includes attribute information, material input / output information, a process schedule, And displaying the contents to be inspected on the display.

According to another aspect of the present invention, there is provided a method of inspecting a ship for augmented reality-based ship, the method including the steps of: (f) receiving information on an assembly part determined to be incompatible with the mobile terminal;

The method further comprises the steps of: (g) when the viewpoint of the image captured by the camera is changed, matching the captured image of the target part with the 3D model shape And the step (c) is performed again.

According to another aspect of the present invention, there is provided a computer-readable recording medium storing a program for performing a method of inspecting an augmented reality vessel of a mobile terminal having a camera and a display and communicating with a server via a mobile communication network, The mobile terminal captures and inputs an image through the camera and identifies one component (hereinafter referred to as a target component) in the image; (b) the mobile terminal transmits identification information of the target part to the server, thereby requesting and receiving 3D model shape data of the target part and a part (hereinafter referred to as an assembly part) to be assembled with the target part; (c) the mobile terminal aligning the captured image of the target part with the 3D model shape of the target part and displaying it on the display; (d) the mobile terminal aligning a 3D model shape of the assembly part with a 3D model shape of the object part and displaying the 3D model shape on the display; And (e) the mobile terminal determines whether or not the 3D model shape of the assembly part displayed on the display is matched or mismatched, by checking whether each of the 3D model shapes matches the photographed image.

As described above, according to the augmented reality-based ship block inspection method of the present invention, since the assembled physical parts are matched with the shape of the three-dimensional model and compared with each other, the complexity of performing the three- An effect of remarkably reducing is obtained.

In addition, according to the method for inspecting blocks of a ship based on an augmented reality according to the present invention, only the parts that are combined within a predetermined radius are marked and displayed in the marked part, thereby minimizing the number of communications and the amount of data for communication with the server, An effect of shortening the transmission / reception time can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram showing an example of an overall system configuration for implementing the present invention; Fig.
2 is a block diagram of a configuration of a mobile terminal according to an embodiment of the present invention;
3 is a block diagram of a configuration of a database according to an embodiment of the present invention;
4 is a flowchart illustrating a method of inspecting a ship based on an augmented reality according to an embodiment of the present invention.
Fig. 5 is an exemplary view showing an image of a picked-up part and a 3D model shape according to the present invention registered on a display; Fig.
6 is an exemplary diagram showing a 3D model shape of an assembly part extracted when a radius is changed according to the present invention;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings.

In the description of the present invention, the same parts are denoted by the same reference numerals, and repetitive description thereof will be omitted.

First, a configuration of an overall system for implementing a method of inspecting a ship for an augmented reality-based ship according to the present invention will be described with reference to FIG. 1 to FIG.

As shown in FIG. 1, the overall system for implementing the present invention comprises a mobile terminal 10, a server 30, and a database 40. It further comprises a mobile communication network 21 or a network 22 for connecting the mobile terminal 10 and the server 30.

The mobile terminal 10 refers to a terminal using a wireless network (or mobile communication network) such as a smart phone. In particular, the mobile terminal 10 is provided with an application capable of realizing an augmented reality, or incorporates such an application.

2, the mobile terminal 10 includes a camera 11 capable of capturing an object, a display 12 composed of an LCD or the like, a display 12 capable of communicating with the server 30 via the wireless network 21, A wireless speech interface 13, a memory 14 for storing data, and a control unit 15 configured by a microprocessor and controlling each component (or module).

When the camera 11 of the mobile terminal 10 picks up the real part, the real part picked up on the display 12 is displayed, and not only the captured image but also data or image virtualized as augmented reality 12).

For example, when the real part is picked up by the camera 11, the picked physical part is displayed on the display 12, and the name, material, characteristic, etc. of the real part can be displayed together with the real part. Further, the engaging parts to which the physical parts are assembled together can be displayed on the display 12 together.

In addition, the display 12 preferably comprises a touch screen having a sufficiently large screen. The direction or size of the virtual image (or data) displayed through the touch screen can be adjusted.

The server 30 stores and manages the parts of the ship and the data related to the process and inspection of the ship construction in the database 40. When the mobile terminal 10 accesses and requests the necessary data, To the terminal (10).

As shown in Fig. 3, the database 40 mainly comprises a process database 40a and a part model database 40b.

The process database 40a is provided with a Bills of Material (BOM) database 41 for storing the attributes of the parts and the relationship between the parts, a material input / output database 42 for storing the entry and exit information of the parts, A schedule database 43, and a block check database 44 for storing check sheets for block check.

In addition, the parts model database 40b is made up of a lightweight 3D model database 45. The lightweight 3D model database 45 stores geometry information of all the components necessary for drying the ship.

In the lightweight 3D model database 45, identification information such as an ID (part number) and a name of the part and three-dimensional shape information of the part are stored for each part. In addition, the distance (or radius) between each component when each component is assembled (or coupled) is also stored.

Therefore, the server 30 can search all the parts assembled within a predetermined distance for one specific part in the 3D model database 45, using these distance (or radius) data.

Next, an augmented reality-based ship inspection method according to an embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 4, the method for inspecting blocks of an augmented reality-based ship according to an embodiment of the present invention includes a target component identification step S10, a 3D model shape reception step S20, a matching step S30, A shape display step (S40), a mismatch shape search step (S50), and a check content display step (S60) for a mismatched part. In addition, when the viewpoint is changed, it further includes a repetition step S70.

First, the target component identification step (S10) will be described in detail.

The mobile terminal 10 captures an image (or captures an image) around a specific part (or a target part), receives a captured image, and identifies a target part in the image (S10).

At this time, preferably, the target part is identified through the marker attached to the target part. That is, the contents of the marker captured in the image are recognized, and the target component is identified according to the recognized content. The markers may include information about the part or a block (or assembly) or process information used for the part. On the other hand, the marker displays identification information with a character or a code.

At this time, preferably, the inspector can attach a marker to a specific component existing in an area to be inspected and pick up an image of the target part to which the marker is attached through the camera 11 of the mobile terminal 10.

In another embodiment, a recognition program (or an application) capable of recognizing a part is provided in the mobile terminal 10, so that the part can be recognized only by the image of the target part without a marker. As another embodiment, when the mobile terminal 10 transmits the photographed image to the server 30, the server 30 can analyze the image and identify the target part. The information of the target component recognized by the server 30 is transmitted again to the mobile terminal 10, and the target part is identified.

On the other hand, it is preferable that the information that the mobile terminal 10 recognizes (identifies), in addition to the information about the target part itself, information about which process (or assembly block) the target part is assembled with. Since one component can be used for several processes, it must be judged which process was used. Process identification can also be applied to both markers and image analysis.

Next, the 3D model shape receiving step (S20) will be described in detail.

When the target component is recognized in the sensed image, the mobile terminal 10 transmits the identification information (or process information) of the target component to the server 30, and stores the 3D model shape data of the target component, 3D model shape data of a part to be assembled (hereinafter, an assembly part) is requested (S20). Then, the mobile terminal 10 receives 3D model shape data.

At this time, the parts to be assembled with the target part include all the parts to be assembled by being directly or indirectly combined with the target part. That is, the assembled part includes both an assembled part directly assembled with the target part and a part coupled with the assembled part. It includes parts that are not directly coupled to the target component, but are assembled in series.

Preferably, the server 30 transmits only the 3D model shape of parts assembled (or combined) within a predetermined distance from the target part. The predetermined distance (or radius) is a predetermined distance or a distance set by the inspector.

When the inspector further changes the radius (distance) through the mobile terminal 10, the mobile terminal 10 additionally requests the 3D model shape data of the part larger than the radius before change and assembled within the radius after the change, do. If the radius is changed smaller, it is not additionally requested because it can be displayed with the shape data already received.

Next, the matching step (S30) of the target components will be described in detail.

Upon receiving the target component and the 3D model shape of the assembly part from the server 30, the mobile terminal 10 aligns the 3D model shape of the target part with the image of the captured target part (S30).

The 3D model shape varies depending on the viewpoint and the size, and the 2D image displayed on the display 12 is different. That is, since the 3D model shape is projected on the display 12, which is a two-dimensional screen, the viewpoint and size must be determined. The position at which the 3D model shape is projected is the same as the position of the photographed object part. Accordingly, the two-dimensional image projected on the display 12 is matched with the image of the object part to be photographed.

The matching method can be matched by receiving an instruction from the inspector. The inspector can adjust the angle (viewpoint) or size of the 3D model shape of the target component displayed on the display 12 of the touch screen to match the image of the photographed target part.

As another embodiment, the captured image of the target part and the 3D model shape can be matched by an image matching method. That is, feature points such as edges and planes are extracted from the captured image of the target component, and the extracted feature points are matched with the feature points of the 3D model shape image to match the two images. Specifically, the size and the viewpoint can be obtained and the two images can be matched.

Next, the shape display step (S40) of the assembly part will be described in detail.

When the captured image of the target part and the 3D model shape are matched, the mobile terminal 10 matches and displays the 3D model shape of the part (assembly part) to be assembled with the target part, with the target part of the displayed image.

That is, the assembled parts are displayed in conformity with the assembled state of the 3D model shape of the target part, and the time and size of displaying the assembled parts are determined according to the viewpoint and size of the 3D model shape of the target part.

Since the 3D model shape of the assembly part is also projected on the two-dimensional display, the viewpoint, size, and position should be determined. The viewpoint and the size of the 3D model shape of the assembly part are determined by the viewpoint and the size of the target part, and the position is determined by the position where the 3D part model of the target part is assembled with the shape. The position is also adjusted according to the viewpoint and size.

5, the actual image of the target part 61 and the 3D model shape are displayed on the display 12 of the mobile terminal 10 and the 3D model shape of the assembly part 62 assembled with the target part 61 Is displayed.

Further, preferably, the mobile terminal 10 enhances only the assembled parts assembled within a predetermined distance (or radius) and displays it on the display 12. The inspector can change the radius of the display range, and if changed, only the assembled parts assembled within the radius are augmented and displayed on the display 12. That is, only the assembled parts assembled within the radius of the display range of the target part are displayed.

That is, in the example of FIG. 6, (a) is a 3D model shape within a radius of 1 m, and (b) and (c) are 3D model shapes within a radius of 3 m and 5 m, respectively.

Next, the mismatch shape search step (S50) will be described in detail.

The mobile terminal 10 searches for a 3D model shape that is inconsistent with the captured image (S50).

Specifically, the mobile terminal 10 determines whether the 3D model shape of each assembly part matches the photographed image, and determines whether the 3D model shape matches or mismatches (S50).

The method of matching the photographed image and the 3D model shape of the assembled part can be divided into the embodiment directly inputted by the inspector and the embodiment of automatically inspecting the image using the image recognition method.

As an example of the former, the inspector compares the 3D model shape of the assembly displayed on the display 12 with the image to determine whether it is a match or a mismatch. At this time, preferably, the mobile terminal 10 can sequentially highlight all of the 3D model shapes of the assembled parts one by one to inquire of the inspector whether or not to judge.

For example, if there are A, B, and C assemblies, the shape of A will blink and the inspector will select, then the shape of B will blink, allowing the inspector to select. In this case, since the inspector compares only the highlighted portion with the naked eye, it is possible to judge whether or not the matching is fast and accurate.

In the latter embodiment, the mobile terminal 10 extracts a photographed image corresponding to the 3D model shape of the assembly part, finds a feature point such as a corner or a face in the extracted image, Contrast with minutiae. If it is determined that the contrast result is similar (that is, it is judged that the comparison result is similar if it is greater than or equal to a certain threshold value), it is judged that it is matched. If it is judged not to be similar, it is judged to be incongruent.

Next, the inspection content display step (S60) for the unmated part will be described in detail.

When the uncompleted part is identified, the mobile terminal 10 confirms the attribute information, the material input / output information, the process schedule, the block inspection item, and the like of the unmistakable assembly part, and displays the matters or the content to be inspected on the display 12 (S60).

At this time, when the mobile terminal 10 requests the server 30 for the matters or the contents to be inspected, the server 30 refers to the process database 40a and searches for and transmits the data.

Lastly, when the viewpoint of the photographed image is changed, the process is repeated from the matching step S30 of the target part (S70).

When the examiner changes the position of the mobile terminal 10, the viewpoint of the camera 11 is changed. At this time, since the viewpoint of the image to be captured is changed, the matching process must be performed again as a whole. Therefore, the process from the matching step S30 of the target parts is performed again. Since the identification (S10) of the target component and the 3D model shape are already taken from the server 30 and stored, there is no need to additionally fetch it.

Preferably, additional matching is not determined with respect to the shape of the assembled part for which matching has already been determined in the mismatch searching step (S50).

The invention made by the present inventors has been described concretely with reference to the embodiments. However, it is needless to say that the present invention is not limited to the embodiments, and that various changes can be made without departing from the gist of the present invention.

10: mobile terminal 11: camera
12: display 15:
21: mobile communication network 22: network
30: server 40: database
61: Target part 62: Assembly part

Claims (14)

A method for inspecting a ship's augmented reality vessel of a mobile terminal having a camera and a display and communicating with a server through a mobile communication network,
(a) the mobile terminal captures and inputs an image through the camera, and identifies one component (hereinafter referred to as a target component) in the image;
(b) the mobile terminal transmits identification information of the target part to the server, thereby requesting and receiving 3D model shape data of the target part and a part (hereinafter referred to as an assembly part) to be assembled with the target part;
(c) the mobile terminal aligning the captured image of the target part with the 3D model shape of the target part and displaying it on the display;
(d) the mobile terminal aligning a 3D model shape of the assembly part with a 3D model shape of the object part and displaying the 3D model shape on the display; And
(e) for each 3D model shape of the assembly part displayed on the display, checking whether the 3D model is matched with the photographed image to determine whether it is matched or mismatched. Of the block.
The method according to claim 1,
Wherein, in the step (a), identification information of the target part is recognized by recognizing a marker attached to the target part.
The method according to claim 1,
In the step (b), the server transmits only a 3D model shape of parts assembled within a predetermined radius from the object part.
The method according to claim 1,
In the step (b), if the mobile terminal changes from a predetermined radius (hereinafter referred to as a first radius) to a radius (hereinafter referred to as a second radius) larger than the first radius, Wherein the 3D model shape data of the part to be assembled within a radius is additionally requested to and received from the server.
The method according to claim 1,
Wherein, in step (c), the mobile terminal extracts feature points of an edge or a face from the photographed image of the target part, and matches the extracted feature points with the feature points of the 3D model shape Inspection method of ship block.
The method according to claim 1,
Wherein, in the step (c), the mobile terminal aligns the captured image of the target part with the 3D model shape of the target part by a touch screen input of the display by the examiner, Of the block.
The method according to claim 1,
In the step (d), the position, the viewpoint, and the size are extracted from the 3D photographing shape of the target part matched with the photographed image of the target part in the step (c) Wherein the 3D model of the assembly is matched and displayed on the display.
The method according to claim 1,
In step (e), the mobile terminal extracts feature points of an edge or a face from the photographed image of the assembly part, matches the extracted feature points with the feature points of the 3D model shape of the assembly part, Wherein the step of determining the strength of the block is performed based on the determination result.
The method according to claim 1,
Wherein, in the step (e), the mobile terminal determines whether the 3D model of each of the assembled parts is matched or mismatched according to an input of the inspector.
10. The method of claim 9,
In step (e), the mobile terminal sequentially highlights the periphery of each shape on the display for each of the 3D model shapes of the assembled part, and when an input of the match or mismatch of the inspector is received, And determining the matching or incompatibility of the assembled parts.
The method of claim 1,
(f) displaying the attribute information, the material input / output information, the process schedule, the block check item, and the content to be inspected on the display for the assembled part determined to be incompatible in the step (e) A block inspection method for augmented reality based ship.
12. The method of claim 11,
Wherein, in the step (f), the mobile terminal requests and receives information on an assembly part determined as the mismatch, from the server.
The method of claim 1,
(g) a step of (c), when the viewpoint of the image captured by the camera is changed, matching the captured image of the target part with the 3D model shape is performed again. Way.
A computer-readable recording medium having recorded thereon a program for performing a block inspection method of augmented reality-based ship of a mobile terminal having a camera and a display and communicating with a server via a mobile communication network,
(a) the mobile terminal captures and inputs an image through the camera, and identifies one component (hereinafter referred to as a target component) in the image;
(b) the mobile terminal transmits identification information of the target part to the server, thereby requesting and receiving 3D model shape data of the target part and a part (hereinafter referred to as an assembly part) to be assembled with the target part;
(c) the mobile terminal aligning the captured image of the target part with the 3D model shape of the target part and displaying it on the display;
(d) the mobile terminal aligning a 3D model shape of the assembly part with a 3D model shape of the object part and displaying the 3D model shape on the display; And
(e) for each 3D model shape of the assembly part displayed on the display, checking whether the 3D model is matched with the photographed image to determine whether it is matched or mismatched. A method for performing a method of performing a block checking method of a computer readable recording medium having recorded thereon a computer readable recording medium.

Images