KR20010045793A - Wrinkle/seam pucker analyzer for textile fabric - Google Patents

Abstract

PURPOSE: A textile wrinkle analyzer is provided to promptly and quantitatively indicate a level by automatically analyzing the extent of wrinkles of textile when a textile sample is put on a table. CONSTITUTION: A textile wrinkle analyzer includes an Y-Y conveyance table(10) for putting a textile sample to be tested, a projector(20) for projecting an inspection pattern of a net form on the textile sample, a pair of calibrated digital cameras(30,30') for obtaining image of inspection pattern projected to the textile sample by the projector, an illuminating part for illuminating calibration standard pattern when the digital cameras perform calibration, a main computer(50) for quantitatively indicating the extent of wrinkles of the textile, a main case(60) receiving and supporting the Y-Y conveyance table, the projector and the digital cameras, blocking the outside light and forming a darkroom, and a door for sealing a front surface hole of the main case.

Description

Wrinkle / seam pucker analyzer for textile fabric}

The present invention relates to a fabric wrinkle analyzer that analyzes the degree of wrinkles of various fabrics and displays the grade quantitatively and quickly.

The degree of wrinkles in fabrics is a major factor in determining the quality of products. Therefore, textile factories and garment manufacturers use grades as an important factor of quality control by measuring and analyzing the degree of wrinkles of the produced products to determine the grade and reflecting them in the production process. In recent years, the need for ironing after washing has emerged as a major item in the propaganda of clothing products, and quantitative evaluation of the degree of wrinkles is important.

Conventionally, in measuring the wrinkle degree of the fabric, it was visually observed and judged using a sample for measuring the wrinkle degree classified into approximately five grades manufactured and certified by an authorized institution. That is, the fabric sample to be examined and the sample for measuring the wrinkle degree were visually measured to determine which grade the wrinkle degree of the fabric belongs to. Therefore, there were limitations of subjectivity, low reliability, and observer's professionalism, which are disadvantages of visual textile evaluation by human beings, and are commonly used AATCC (American Association of Textile Chemists and Colorists). There were also problems with the degree of wrinkles between the grades of standard wrinkle replicas (Standard Wrinkle Replica).

The present invention has been made in view of the above point, and an object of the present invention is to provide a fabric wrinkle analyzer that automatically analyzes the degree of wrinkles of the fabric and displays the grade quantitatively and quickly.

1 is a schematic view showing a fabric wrinkle analyzer according to an embodiment of the present invention.

Figure 2 is a front view showing the structure of the fabric wrinkle analyzer shown in FIG.

3 is a plan view of FIG.

4 is a side view of FIG. 2;

FIG. 5 is a plan view showing an X-Y transfer table of the fabric wrinkle analyzer shown in FIG. 2; FIG.

6 is a side view of FIG. 5;

7 is a flow chart showing a control method of the fabric wrinkle analyzer according to an embodiment of the present invention.

FIG. 8 is a view showing images of grades 1 to 5 of AATCC Standard Wrinkle Replica (AATCC). FIG.

9 is a view in three dimensions of the surface of the AATCC standard wrinkled replica shown in FIG.

Fig. 10 shows the relationship between the AATCC standard wrinkled replica and the fractal dimension.

11 illustrates an example of a reference pattern used when calibrating a camera.

Explanation of symbols on the main parts of the drawings

10; X-Y feed table 11; base plate

13; X-axis plate 15; Y-axis plate

12, 14; guide rails 16, 18; first and second moving means

20; projector 21; projector slider

22; projector bracket 30,30 '; digital camera

31; camera support slider 32; camera bracket

23, 33; control knob 40; controller

50; main computer 60; body case

61; heat sink 70; door

72; small door 80; lamp

81; lamp bracket 82; lamp rail

Fabric wrinkle analyzer according to the present invention for achieving the above object, the XY transfer table for placing the sample to be examined and the sample is precisely transferred when necessary to measure the various parts, and the inspection pattern on the fabric sample placed on the XY transfer table And a plurality of intersection coordinates in a left and right pair of calibrated digital cameras for acquiring an image of an inspection pattern projected by the projector onto the fabric sample, and an inspection pattern image acquired by a pair of digital cameras. Automatic extraction through image recognition, using the stereo image algorithm to calculate the three-dimensional coordinates and applying the three-dimensional coordinates to the fractal dimension by analyzing the main computer that displays the degree of wrinkles of the fabric by grade, and XY transfer Accepts and supports tables, projectors, and a pair of digital cameras Includes a main body case and a door blocking the front opening of the main body case to block external light.

The XY transfer table includes a base plate attached to the bottom surface of the main body case, an X axis plate provided on the upper part of the base plate so as to be slidably moved in both directions, and a guide rail disposed on the upper part of the X axis plate. And a Y-axis plate provided to be slidably moved back and forth in both directions, first moving means for moving the X-axis plate, and second moving means for moving the Y-axis plate. Here, the base plate, the X-axis plate, and the Y-axis plate are surface-reflected black surface treatment to suppress the reflected light.

When the first and second moving means need to move the XY transfer table only two positions in the X direction and two positions in the Y direction, the first and second moving means can be simply implemented by directly using the solenoid as the driving source, and in each direction three When it is necessary to move more than a position, it can implement by using a control motor, such as a stepping motor or a servomotor, as a drive source, and using a ball screw mechanism.

In addition, the projector is mounted on the projector bracket, the projector bracket is supported to be movable in the vertical direction to the projector slider attached to one side of the inner side of the main body case, and the adjustment knob for adjusting its vertical height is connected to the projector bracket It is configured to adjust the height of the projector arbitrarily.

A pair of digital cameras are respectively fixed to the camera brackets, which are movably supported in a vertical direction by camera slides respectively attached to the inner side surfaces of the main body case, and the camera brackets are used to adjust their height in the vertical direction. The adjustment knob is connected, and is configured to arbitrarily adjust the height of the camera.

The main body case is attached to a heat sink having an external light blocking structure on the upper portion, the inner surface is treated with an anti-reflective black surface to suppress the reflected light inside, and a sealing member for blocking light is attached to the contact portion with the door.

On the lower side of the door, a small door is installed to be able to rotate open and close so that the fabric sample can be placed on the X-Y transfer table inside the main body case without the door fully opened.

Meanwhile, the fabric wrinkle analyzer according to the present invention further includes a lamp for illuminating a calibration reference pattern placed on the X-Y transfer table when performing the calibration of the camera. The lamp is fixed to the lamp rail and is supported on one side of the inner surface of the main body case, and a lamp bracket is attached to one side of the inner surface of the main body case to support the lamp rail to be movable in the vertical direction. Another illumination method of the calibration reference pattern is also possible by placing a scattered light source of a backlight method under the X-Y transfer table.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic view of a fabric wrinkle analyzer according to an embodiment of the present invention.

As shown, the fabric wrinkle analyzer of the present invention includes a XY transfer table 10 on which a fabric sample to be inspected is placed, and a projector 20 for projecting an inspection pattern onto the fabric sample placed on the XY transfer table 10. And a pair of left and right calibrated digital cameras 30 and 30 'for acquiring an image of an inspection pattern projected by the projector 20 onto the fabric sample, and the pair of digital cameras 30 and 30. Automatically extract multiple coordinates of coordinates from the test pattern image acquired by ') using image recognition, calculate it as 3D coordinate value using stereo image algorithm, and apply the 3D coordinate value to fractal dimension and analyze It includes a main computer 50 for quantitatively displaying the degree of wrinkles of the fabric.

2 to 4, the fabric wrinkle analyzer according to the present invention accommodates the XY transfer table 10, the projector 20, and a pair of digital cameras 30 and 30 '. The main body case 60 is supported, and the main body case 60 is provided with the door 70 so that rotation is possible. In addition, the inner side of the main body case 60 is provided with a lamp 80 for illuminating a calibration reference pattern placed on the X-Y transfer table 10 during the calibration of the camera.

The X-Y transfer table 10 is provided on the bottom surface of the main body case 60. As shown in FIGS. 5 and 6, the XY plate 10 is provided with an X-axis plate 13 on the upper part of the base plate 11 so as to be movable in both left and right directions. The Y-axis plate 15 is provided on the upper part so as to be movable in both directions. The base plate 11 is formed with a guide rail 12 for guiding the movement of the X-axis plate 13, the second guide for guiding the movement of the Y-axis plate 15 in the X-axis plate 13 The rail 14 is formed. In addition, the base plate 11 is provided with a first moving means 16 for moving the X-axis plate 13, the X-axis plate 13 for moving the Y-axis plate 15 Second moving means 18 is provided.

In this embodiment, the first moving means 16, the solenoid bracket is connected to one side of the direct current solenoid 16a and the direct current solenoid 16a, the other side is connected to the X-axis plate 13 Plungers 16c and 16d which are located at both sides of the solenoid bracket 16b and implement a return operation of the X-axis plate 13 by a stopper role and a spring installed therein, and the X The microphoto sensor 16e and the bracket sensor 16f which detect the movement of the shaft plate 13 are comprised. On the other hand, the configuration of the second moving means 18 is also the same as the configuration of the first driving means 16 described above. Therefore, detailed description is omitted here. The driving of the first and second moving means 16 and 18 configured as described above is controlled by the controller 40. In particular, the X-Y transfer table 10 is formed of a material having a good plan view, and its surface is treated with a black surface for thorough antireflection. On the other hand, in the case where the XY transfer table 10 is moved three or more positions in the left and right, front and rear directions, a control motor such as a stepping motor or a servo motor is used as a driving source of the first and second moving means 16 and 18. Can be implemented using a ball screw mechanism.

The projector 20 is installed to be located at the inner center of the main body case 60, and has a slide film printed with a fabric inspection pattern. The projector slider 21 is attached to one inner side of the main body case 60, and the projector bracket 22 is installed on the slider 21 so as to be movable upward and downward, and the projector 20 is the projector. It is mounted on the bracket 22. In addition, the projector bracket 22 is connected to the adjustment knob 23 for adjusting its height in the vertical direction. It is also possible to use a laser projector as another inspection pattern projection method. This method is applied as an advanced light source when the fabric has a complicated pattern and it is difficult for the general optical projector 20 to find an intersection by moiré interference pattern or the like in the image of the inspection pattern.

The pair of digital cameras 30 and 30 'are provided on both side walls of the main body case 60. Camera support sliders 31 are attached to both side walls of the main body case 60, and camera brackets 32 are provided on the sliders 31 so as to be movable in the vertical direction, and the digital cameras 30 ( 30 'are fixed to the camera brackets 32, respectively. In addition, the camera bracket 32 is connected to the adjustment knob 33 for adjusting the vertical height thereof.

On the other hand, the main body case 60 forms a dark room by the door 70 is closed, the heat sink 61 of the external light blocking structure using an air conditioner filter is mounted on the upper side, the power and digital camera signal on the back A plurality of holes are formed for the USB port as the transmission means. The inner surface is treated with a black surface, and the contact surface between the body case 60 and the door 70 is sealed to block external light.

In addition, the door 70 is provided with a handle 71, a lower door 72 is provided to open and close. A handle 73 is also provided in this small door 72.

The lamp 80 is for illuminating a calibration reference pattern placed on the XY transfer table 10 when the camera is calibrated. A lamp bracket 81 is provided on one side of the inner surface of the main body case 60. The lamp rail 82 is provided in the bracket 81, and the lamp 80 is attached to this lamp rail 82 so that a movement to an up-down direction is possible. Another illumination method of the calibration reference pattern may be a method of placing a backlight scattering light source under the X-Y transfer table.

Hereinafter, the operation of the fabric wrinkle analyzer according to the present invention as described above.

The analysis work of the fabric wrinkle analyzer according to the present invention is roughly divided into a camera calibration step and a fabric inspection step.

The camera calibration step is to establish a three-dimensional coordinate relationship between the X-Y transfer table and the two digital cameras. First, a calibration reference pattern is prepared (S10). This calibration reference pattern is formed by printing 48 ((6 × 8) squares (black) with precise dimensions, as shown in Fig. 11. Then, the calibration pattern is placed on the XY transfer table, and the lamp 80 The image of the left and right two images are captured by illuminating the calibration pattern (S20), and then image features of a total of 192 corners of the 48 blocks in the calibration pattern are extracted (S30), and the calibration target variables are calculated. The three-dimensional coordinate relationship between the XY transfer table and the two digital cameras is established at step S40. The calibration result is stored in the computer and used continuously, and only once when the position of the XY transfer table or the two cameras is changed. Just do it.

After the above calibration step is completed, the fabric sample to be inspected is prepared (S50), and the inspection sample is placed on the X-Y transfer table. Then, using the projector to project the inspection pattern of the mesh form consisting of a horizontal 20 lines vertical 20 lines to the sample (S60). After that, a pair of stereo images are captured from the test pattern projected onto the test sample by using a pair of left and right digital cameras (S70). Then, the XY transfer table is moved only in the X axis, only in the Y axis, and simultaneously moved in the XY axis. Performing the steps S60 and S70 repeatedly while moving the back three times, a total of four pairs of stereo images are acquired. At this time, the amount of movement in the X and Y directions is set to about half the length in the mesh pattern projected onto the fabric. Then, image coordinates of a total of 1600 intersection points are extracted at 400 intersection points from a pair of stereo images (S80).

The image coordinates extracted through the above steps are output to the main computer through the controller. The main computer calculates three-dimensional coordinates of 1600 intersection points using a stereo vision algorithm based on the input data (S90), and calculates a fractal dimension based on this (S100).

At this time, the fractal dimension calculation is performed through a program implemented by the fractal algorithm using the three-dimensional coordinate values of the 1600 intersection points obtained above. The program restores the surface of the fabric to be inspected to a three-dimensional shape by using the three-dimensional coordinate values obtained above, and cuts the formed three-dimensional surface in the X and Y directions to enter a predetermined size below the upper curve in the plane. Fractal dimensional values are obtained by counting the boxes of or by cube counting, which counts the total number of cubes by filling a cube of a predetermined size directly below the three-dimensional surface. The fractal dimensional value is close to 2.0 when the surface shape is completely flat, and close to 3.0 when the surface shape is very uneven, so that the degree of wrinkle of the surface can be quantitatively expressed. The surface of five existing AATCC standard wrinkled replicas (see FIG. 8) is restored to the three-dimensional shape of the surface by the stereo vision method (see FIG. 9) to obtain a three-dimensional coordinate value, and then a fractal dimension value is obtained. Then, a linear regression equation (see FIG. 10) is obtained from the relationship between the fractal dimension values obtained above.

Therefore, after obtaining the fractal dimension value from the three-dimensional coordinate value of the fabric sample to be inspected, it is possible to display and output the degree of wrinkle of the inspection sample in a predetermined grade through the regression (S120) (S110).

According to the present invention as described above, the inspector simply puts the fabric sample to be examined on the table of the analyzer and the wrinkle degree of the fabric is automatically analyzed and output as a predetermined grade. Therefore, the degree of wrinkles of various fabrics can be automatically and accurately known quickly.

Although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the above-described embodiments, and the present invention is not limited to the above-described claims, and is generally used in the art to which the present invention pertains without departing from the gist of the present invention as claimed in the following claims. Anyone skilled in the art can make various modifications, as well as such modifications that fall within the scope of the claims.

Claims (11)

An X-Y transfer table on which the fabric sample to be examined is placed; A projector for projecting an inspection pattern in the form of a mesh onto a fabric sample placed on the X-Y transfer table; A pair of left and right calibrated digital cameras for acquiring an image of an inspection pattern projected by the projector onto the fabric sample; Means for illuminating a calibration reference pattern when performing calibration of the digital camera; Automatically extract a plurality of intersection coordinates from the inspection pattern images acquired by the pair of digital cameras through image recognition, calculate the coordinates to three-dimensional coordinates using a stereo image algorithm, and calculate the three-dimensional coordinates into fractal dimensions. A main computer for quantitatively displaying the wrinkles of the fabric by analyzing the theory; A main body case accommodating and supporting the X-Y transfer table, a projector, and a pair of digital cameras and blocking external light to form a dark room; And And a door that closes and seals the front opening of the main body case. The method of claim 1, wherein the X-Y transfer table, A base plate attached to a bottom surface of the main body case; An X-axis plate installed on the upper part of the base plate so as to be slidably moved in left and right directions under an interposition of a guide rail; A Y-axis plate installed on the upper portion of the X-axis plate so as to be slidably moved back and forth in both directions under a guide rail; First moving means for moving the X-axis plate; And And a second moving means for moving the Y-axis plate. The method of claim 2, wherein the first and second moving means, Drive source; One side is connected to the drive source, the other side is a solenoid bracket connected to the X-axis plate and Y-axis plate; Plungers which are located on both sides of the solenoid bracket to implement the return operation of the X-axis and Y-axis plate by the stopper role and the spring installed therein; A micro photo sensor for detecting movement of the X-axis plate and the Y-axis plate; And Bracket sensor; fabric wrinkle analyzer, characterized in that comprising a. 4. The driving source of claim 3, wherein the driving source comprises a DC solenoid when the XY transfer table is moved only two positions in the front, rear, and left and right directions, and the XY transfer table is moved at least three positions in the front, rear, left, and right directions. The fabric wrinkle analyzer, characterized in that composed of a control motor such as a stepping motor or a servo motor. The projector of claim 1, wherein the projector is mounted on a projector bracket, and the projector bracket is movably supported in a vertical direction by a projector slider attached to one side of an inner surface of the main body case. An adjustment knob for adjusting is connected to the fabric wrinkle analyzer, characterized in that the height of the projector can be adjusted arbitrarily. The camera of claim 1, wherein each of the pair of digital cameras is fixed to a camera bracket, and the camera brackets are movably supported in a vertical direction by camera support sliders respectively attached to inner side surfaces of the main body case. The bracket is connected to the adjustment knob for adjusting the height of the vertical direction, the fabric wrinkle analyzer, characterized in that the height of the camera can be adjusted arbitrarily. According to claim 1, wherein the main body case is a heat sink having an external light blocking structure is attached to the upper portion, the inner surface is anti-reflective black surface treatment, the contact portion with the door is characterized in that the sealing member for blocking light is attached Fabric Wrinkle Analyzer. The fabric pleat according to claim 1, wherein a small door is provided on the lower side of the door so that the fabric sample can be placed on the XY transfer table inside the main body case without being fully opened. Analyzer. The fabric wrinkle analyzer of claim 1, wherein the lighting means comprises a lamp disposed on an upper side of the X-Y transfer table. The method of claim 9, wherein the lamp is fixed to the lamp rail is supported on one side of the inner surface of the main body case, the inner surface of the main body case is attached to the lamp bracket for supporting the lamp rail to move in the vertical direction Fabric wrinkle analyzer. The fabric wrinkle analyzer of claim 1, wherein the lighting unit comprises a backlight type laser light source installed below the X-Y transfer table.