JPH07220080A - Fabric pattern matching device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a pattern matching device capable of designating a desired pattern and accurately performing pattern matching based on the pattern. [Structure] w1 from the edge of the material to be patterned,
It is assumed that a specific pattern is detected in the pattern search range w2, and the values of w1 and w2 are input by a predetermined method from the operation panel. When a pattern that satisfies the conditions input from the operation panel is detected by image processing in the image captured by the camera, the range value of the waveform data from the end of the waveform data of the brightness of the image accumulated along the predetermined direction Is sequentially compared with a threshold value obtained by dividing into a predetermined number, and a specific point that cuts the waveform is searched. When this process is continued while changing the threshold value in the direction corresponding to the specified pattern type, the specific point when the number of the specific points reaches a predetermined number corresponds to the position and thickness of the pattern. To detect as. If the position and thickness of the detected pattern satisfy the specified conditions, the specified pattern is detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cloth pattern matching device, in which cloth having a pattern is moved from a predetermined supply position to a photographing position, the cloth is photographed by a camera, and image processing is performed on the obtained image data. The present invention relates to a pattern aligning device that detects the position of a pattern of cloth based on the detected pattern, corrects the position of the cloth based on the detected position of the pattern, and moves to a predetermined position.

[0002]

2. Description of the Related Art Conventionally, when a plurality of cloths having a pattern are cut by a cutting device in a laminated state, if the pattern of the cloth is cut in a misaligned state, each of Since the pattern of the fabric is sewn with misalignment, a pattern aligning device has been developed for performing pattern matching of the fabric and supplying the patterned fabric to the cutting device which is the next step.

In such a conventional cloth pattern matching apparatus, a cloth table on which a predetermined patterned cloth is stacked is placed on the upper part of the main body, and the lower surface of the cloth table is provided on one side of the cloth table. An imaging table that is retractable to the side is disposed, and above the cloth table and the imaging table, a carrying unit that carries the cloths on the cloth table one by one to the upper surface of the imaging table and the imaging unit. Each of the needle pressing units that holds the cloth placed on the upper surface of the table by pressing the pressing needle is provided.

The transport unit is provided with a pickup that holds the fabrics placed on the upper surface of the fabric table one by one and releases the fabrics after they are transported to the upper surface of the imaging table. . A camera unit for detecting the pattern of the cloth is disposed above the imaging table, and a pattern of the cloth detected by the camera unit on a base is below the imaging table. A correction unit having a pattern matching table whose position can be adjusted according to the above is movably provided to an end position of the main body.

In the conventional pattern matching device, a plurality of cloths are placed on the upper surface of the cloth table, one piece of the cloth is grasped by the pickup unit, and then the carrying unit is moved, so that the cloths are moved. Is conveyed above the imaging table, and then the cloth is placed on the upper surface.

In this state, the pattern of the cloth is photographed by the camera unit, the shift of the pattern is detected, the pattern matching table of the correction unit is aligned according to the pattern shift, and the needle pressing unit is used. , The cloth is held on the imaging table, and then the imaging table is retracted to place the cloth on the pattern matching table. When the pattern matching for all the materials on the material table is completed by repeating the above operation, the base of the correction unit is moved to the end of the main body, and the laminated material after the pattern matching on the material table is moved. It is designed to be conveyed to the cutting device in the next step.

[0007]

However, in the above-mentioned conventional cloth pattern matching device, the cloth material is imaged by the camera unit, and the material edge position is detected by the imaged data, and as shown in FIG. A pattern within a predetermined search range is searched centering on a distance w (for example, 48 mm) from the fabric edge position with the edge position as a reference, and the distance w from the fabric edge is obtained.
The shortest pattern is matched at the position. Therefore, it is not possible to perform pattern matching of a specific pattern to be pattern matched, and when a plurality of sewing parts are collectively combined into one pattern matching target fabric, the pattern matching accuracy of the sewing parts closer to the distance w from the fabric edge is There is a problem that the pattern matching accuracy of the sewn parts at the position is lowered.

An object of the present invention is to provide a pattern matching device which can specify a desired pattern and accurately perform pattern matching with the pattern as a reference.

[0009]

In order to solve the above problems, in the present invention, a cloth having a pattern is moved from a predetermined supply position to a photographing position, and the cloth is photographed by a camera.
A pattern to be detected by image processing in a pattern matching device that detects the position of the pattern of the fabric based on the image processing of the obtained image data, corrects the position of the fabric based on the detected position of the pattern, and moves to a predetermined position. And a control means for detecting the pattern having the characteristic specified by the input means by image processing, correcting the position of the cloth based on the detected position of the pattern, and moving the pattern to the predetermined position one by one. The configuration with is adopted.

[0010]

According to the above construction, it is possible to specify the characteristic of the pattern to be detected by image processing, detect the pattern having the specified characteristic by image processing, and perform pattern matching based on the position of the detected pattern.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.
Will be described with reference to.

1 to 3 show an embodiment of a fabric pattern matching device according to the present invention. A plurality of fabrics 11 are provided on one side of the upper surface of a frame-shaped main body 10 of the pattern matching device. A dough table 12 for stacking and placing is provided, and the dough table can be opened upward at an angle of about 45 ° (not shown). Further, an operation panel 40 for setting pattern information and the like is provided. On the other side of the main body 10, an image pickup table 13 is disposed on the lower surface side of the cloth table 12 so as to be retractable by a drive mechanism (not shown).

Further, at both ends of the upper surface of the main body 10,
A pair of guide rails 14 are provided, and the guide rail 14 is provided with a gripping and conveying unit 15 whose both ends are held by the guide rails 14.
It is arranged so as to be reciprocally movable along.

Further, a plurality of (four in the present embodiment) pickups 1 are swingably movable up and down along the longitudinal direction of the gripping transport unit 15 in the gripping transport unit 15. It is arranged so that the dough 11 can be gripped.

Further, the guide rail 14 is provided with a needle pressing unit 20 whose both ends are held by the guide rails 14 so as to be reciprocally movable along the guide rails 14. A plurality of (eight in this embodiment) needle pressing mechanisms 21 are arranged on the needle 20 along the longitudinal direction of the needle pressing unit 20 at predetermined intervals. The needle pressing mechanism 21 is provided with a pressing needle 22 which is vertically movable by a driving mechanism such as a cylinder (not shown).

Further, a camera moving frame 23 is arranged at a position above the imaging table 13 of the main body 10, and the cloth moving on the upper surface of the imaging table 13 is provided in the camera moving frame 23. Take a picture of 11, for example, C
A camera unit 24 such as a CD camera is reciprocally arranged along the moving frame 23. The camera unit 24 is connected to a predetermined detection control unit (not shown), and the detection control unit detects the pattern of the cloth 11 based on the image information from the camera unit 24. An image recognition unit for
It is designed to detect misalignment of the handle. The configuration of the control system will be described later.

At the bottom of the main body 10 is a correction unit 2
5 is provided, and the correction unit 25 has a base 26 that is movable between a lower position of the imaging table 13 and one side of the main body 10. This base 2
An elevating device 27 is disposed on the upper surface of 6, and an elevating guide rail 28 extending in the up-down direction is formed on one side surface of the elevating device 27.

An elevating table 29 is mounted on the elevating guide rail 28 so as to be vertically movable along the elevating guide rail 28. A pattern matching table 31 having a smooth upper surface is disposed above the lifting table 29, and the pattern matching table 31 is driven by a rotation driving device (not shown).
The pattern matching table 31 can be rotated within the plane. Further, on the lower surface of the pattern matching table 31,
A cloth holding mechanism (30) for holding the cloth 11 placed on the upper surface of the pattern matching table 31 is provided, for example, a needle stop device.

FIG. 5 shows the structure of the detection control unit. As shown in the figure, the detection control unit comprises an image recognition section 60 and a control section 50 for controlling each mechanism according to the processing result of the image recognition section 60. The control unit 50 has a CPU 51 connected to a RAM 52 and a ROM 53. The CPU 51 has driving circuits 15a to 25a, 30.
via the gripping and conveying unit 15, the imaging table 13,
Needle pressing mechanism 21, camera unit 24, correction unit 2
5 and the dough holding mechanism 30 are controlled.

The image recognition unit 60 has a RAM 62 and an RO.
The image data stored in the image memory 65, which has the CPU 61 connected to the M63, is photographed by the camera unit 24, digitized by the A / D converter 64, and stored in the image memory 65. The pattern and the edge of the cloth are detected, and the control unit 50 is detected according to the detection result.
Controls the above-mentioned mechanisms.

In the above-mentioned structure, when the pattern information (target pattern position, pattern thickness, pattern search range, pattern type for the background of the cloth) is input from the operation panel 40 and the operation start switch is pressed before starting the operation, first, A plurality of cloths 11 having a predetermined pattern are stacked and placed on the upper surface of the cloth table 12, and the pickup 1 of the gripping and conveying unit 15 is operated to grip and hold the uppermost cloth 11.

After that, the gripping / conveying unit 15 is moved along the guide rails 14 to convey the cloths 11 one by one above the imaging table 13.

Then, with the gripping and conveying unit 15 positioned above the image pickup table 13, the gripping and conveying unit 15 is lowered, and the cloth 11 is placed on the upper surface of the image pickup table 13.

In this state, by operating the camera unit 24 while moving the camera unit 24 along the movable frame 23, the cloth 1
1 is photographed, and the cloth 1 is added to the detection control unit shown in FIG.
The image information of 1 is taken in. The detection control unit shown in FIG. 6 performs the following processing on each piece of image information in fixed distance units.

That is, the image signal detected by the camera unit 24 is quantized by the A / D section and stored in the image memory 65. The CPU 61 of the image recognition unit detects the cloth edge position based on the image data.

The CPU 61 detects the pattern position in the pattern search range in the following manner centering on the position of the pattern to be pattern-matched which is set in advance from the operation panel 40 with the cloth edge position as a reference.

As shown in FIG. 6, with respect to the image data, from a predetermined end portion on the image toward the opposite end portion,
The values on the memory address are sequentially read out along the line of the predetermined angle (φ, θ) and added. This process is also performed on a plurality of predetermined lines parallel to the line of this angle.

When the waveform data is generated by taking these plural added values on the vertical axis and taking the horizontal coordinate of the end on the horizontal axis, the waveform data is as shown in the lower part of FIG. Here, the projection is taken along the angles φ and θ, but since the angle φ is more in agreement with the direction of the handle, the peak portion of the waveform is larger and sharper than the angle θ. .

Therefore, a plurality of this waveform data is generated for each angle from the end to the end, and the maximum value, the minimum value, and the range value (maximum value-minimum value) of each of the waveform data are generated. , And the variance with respect to the average value of the waveform data, the angle at the time of the waveform having the maximum range value and variance can be recognized as the angle of the handle.

Further, in the present embodiment, it is possible to specify the pattern type and the pattern search range from the operation panel 40, and to detect the pattern of the specified type within the search range.

For example, as shown in FIG.
Pattern search range w2 centered on 1 (about 49 to 90 mm)
A specific pattern (for example, about 11 to 40 mm) (for example,
The handle thickness is 1 to 5 mm), w1, w2
The value of is input from the operation panel 40 by a predetermined method.

Further, the type of the pattern is set by the type of pattern of light and dark with respect to the background of the cloth as follows.

F1: plain weave thickness 1 mm D1: dobby thickness 1 mm F2: plain weave thickness 2 mm D2: dobby thickness 2 mm F3: plain weave thickness 3 mm D3: dobby thickness 3 mm F4: plain weave thickness 4 mm D4: dobby thickness 4mm F5: Plain weave Thickness 5mm D5: Dobby Thickness 5mm Where F or D is the light and dark type of the pattern against the ground of the fabric, F is a dark pattern against the ground, and D is a light pattern against the ground. , The numbers following these alphabets are the thickness of the pattern shown above.

FIG. 10 exemplifies the types of patterns F1, F4, D3 and D1. Each type of F1 to F5 to D1 to D5 is also input from the operation panel 40.

When the designated pattern position w1, the pattern search range w2, and the pattern type are input from the operation panel 40 as described above, a pattern satisfying these conditions is detected by image processing.

Therefore, as shown in FIG. 7, the CPU 61 determines from the range value of the waveform data obtained as described above (the one that matches the angle of the pattern is used), that is, the minimum value Pmin of the waveform peak. The range up to the maximum value Pmax of the waveform peak is divided into 32, and the waveform data is searched in a predetermined direction.

The upper part of FIG. 7 is a fabric whose pattern is dark with respect to the ground of the fabric (for example, plain weave), and the lower part is a fabric whose pattern is light with respect to the ground of the fabric (for example, dobby).
In this case, for the sake of convenience, a small peak absolute value on the side close to the brightness of the ground is set as the minimum value Pmi of the waveform peaks.
think n. It goes without saying that whether to assume the upper waveform or the lower waveform in FIG. 7 is determined by the type of the pattern input from the operation panel 40.

If the waveform data of FIG. 7 is stored in the one-dimensional array on the memory as the brightness data,
The memory is sequentially searched from an address corresponding to one end (for example, left side) of the figure, and the brightness data and 32 pieces from the minimum value Pmin of the waveform peak corresponding to the horizontal line in the figure to the maximum value Pmax of the waveform peak. Of these, one threshold value is compared. After the waveform data is scanned once, the comparison is similarly performed using the next threshold value.

For each of the 32 comparisons, in the process of processing the data from the end of the waveform, the pixel whose brightness data is smaller than the threshold value and the brightness data is larger than the threshold value, and the brightness data is more than the threshold value. A pixel that has changed from a large value to a small value, that is, a change point at which the waveform crosses the threshold value is searched for. This change point is indicated by a black circle in the figure. For example, in both the upper and lower parts of FIG. 7, there are six change points at the minimum value Pmin of the waveform peak.

That is, from the end of the waveform data, the range value of the waveform data is sequentially compared with a threshold value obtained by dividing the range value into a predetermined number, and a specific point at which the waveform is cut is searched.

If this is continued while increasing the threshold value toward the maximum value Pmax of the waveform peak, g1, g1, or g2,
There are two change points like g2. This change point g1 ~ g
The distance between 1 and g2 to g2 (distance between pixels) is the thickness of the pattern, and the coordinates of the center of the changing points g1 to g1 are g2 to g2.
You can think of the coordinates of the center of the pattern as the center of the pattern.

The thickness and center of this pattern are less than the thickness of the pattern set by the operation panel 40, and the operation panel 4 is used.
When detected within the specified search range set by 0,
The coordinates of the center of the pattern are the positions of the pattern to be matched.

In short, when a pattern satisfying the conditions input from the operation panel is detected by the image processing in the image photographed by the camera, from the end portion of the waveform data of the brightness of the image accumulated along the predetermined direction, The range value of the waveform data is divided into a predetermined number and sequentially compared with a threshold value to search for a specific point where the waveform is cut.

When this process is continued while changing the threshold value in the direction corresponding to the designated pattern type, the specific point when the number of the specific points reaches a predetermined number is set to the position and thickness of the pattern. Detect as equivalent. If the position and thickness of the detected pattern satisfy the specified conditions, the specified pattern is detected.

As described above, for example, as shown in FIG. 9, when the pattern in the search range center w3 from the edge of the cloth is detected as the pattern to be matched, as shown in the right side of FIG. The second and subsequent same patterns can be combined with this pattern.

As described above, if the pattern type and the pattern search range are specified from the operation panel 40 and the pattern of the specified type is detected within the search range, the pattern is located at a predetermined distance from the fabric edge. Pattern matching can be performed for a desired pattern.

That is, it is possible to absolutely specify a pattern to be matched, which has been impossible in the past, so that a desired pattern can be matched with a predetermined portion of a sewn product such as a shirt. Become.

In addition, even if the types of patterns specified in the several types of fabrics having different types of patterns are similar and the patterns are in the search range at substantially the same position from the fabric end position , Can be matched.

The above image processing is performed for one sheet of cloth.
This is performed for each image sequentially acquired by the camera unit 24, and after the operation of the final screen is completed, the position and angle of the pattern of the entire cloth are detected, and the shift of the pattern from the regular position is detected.

Thereafter, the detection control unit moves the base 26 of the correction unit 25 in accordance with the displacement of the pattern of the cloth 11 to perform the lateral alignment in FIG. After rotating and performing alignment in the rotation direction, the elevating table 29 is elevated along the elevating guide rail 28, and the handle matching table 31 is positioned near the lower surface of the imaging table 13. Then, the needle pressing unit 20 is placed on the imaging table 13 along the guide rail 14 and the cloth 1 is placed.
1, and in this state, the pressing needle 22 of the needle pressing mechanism 21 is lowered to pierce the cloth 11 with the pressing needle 22 and fix the cloth 11 to the upper surface of the imaging table 13.

In this state, the image pickup table 13 is retracted to the lower surface side of the cloth table 12, so that the cloth 11 located on the upper surface of the image pickup table 13 is placed on the upper surface of the pattern matching table 31. Fabric 11 is
It is held on the upper surface of the pattern matching table 31 by the cloth holding mechanism. At this time, since the cloth 11 is held by the presser needle 22, the cloth 11 is not displaced during the retracting operation of the imaging table 13 and the placing operation on the pattern matching table 31.

By repeating the above operation for each of the fabrics 11 stacked on the fabric table 12, the pattern-matched fabrics 11 are sequentially stacked and placed on the upper surface of the pattern matching table 31, and the fabric table is placed. When the patterns 11 of all the doughs 11 placed on 12 are finished and placed on the upper surface of the pattern matching table 31, the base 26 is moved to a position just before the pattern matching table 31 projects from the end of the main body 10. Let

In this state, when the operation of the cloth holding mechanism is released, and then the cloth table is opened upward, a sensor (not shown) works and the half of the pattern matching table 31 has an end portion of the main body 10. From the base 26 to the position where it projects from
Is moved to feed the laminated fabric 11 on the upper surface of the pattern matching table 31 to a predetermined cutting device. In this case, in the present embodiment, the pattern matching table 31
Since the upper surface of the table is formed smooth, the pattern matching table 31
By sliding the dough 11 in a state in which the dough 11 is brought close to the cutting table of the cutting device, the laminated dough 11 can be smoothly moved, and the positional displacement of the laminated dough 11 is surely performed. It can be prevented.

[0054]

As described above, according to the present invention,
The characteristics of the pattern to be detected by image processing are specified, the pattern with the specified characteristics is detected by image processing, and pattern matching is performed based on the position of the detected pattern. Can be done.

Therefore, it is possible to absolutely specify the pattern to be matched, which has been impossible in the past, so that a desired pattern can be matched with a predetermined portion of a sewing part, for example. , When a plurality of sewn parts are put together into one pattern matching target material and the patterns are matched, by designating the pattern in the middle of the parts and matching the patterns, it is possible to prevent deterioration of the pattern matching accuracy due to the position of the parts, Has an excellent effect.

[Brief description of drawings]

FIG. 1 is a schematic front view showing an embodiment of a cloth pattern matching device according to the present invention.

2 is a schematic side view of the device of FIG.

3 is a schematic plan view of the device of FIG.

FIG. 4 is an explanatory diagram showing a conventional pattern matching process.

FIG. 5 is a block diagram of a detection control unit according to the present invention.

FIG. 6 is an explanatory diagram showing a method for detecting a pattern angle according to the present invention.

FIG. 7 is an explanatory view showing a pattern position detecting method according to the present invention.

FIG. 8 is an explanatory diagram showing information for designating a pattern according to the present invention.

FIG. 9 is an explanatory diagram showing designated pattern matching according to the present invention.

FIG. 10 is an explanatory diagram showing types of patterns used in the present invention.

[Explanation of symbols]

 1 pickup 10 main body 11 cloth 12 cloth table 13 imaging table 14 guide rail 15 gripping transfer unit 20 needle pressing unit 21 needle pressing mechanism 22 pressing needle 23 moving frame 24 camera unit 25 correction unit 27 lifting device 28 lifting guide rail 29 lifting platform 31 Pattern matching table 40 Operation panel 50 Control section 60 Image recognition section 64 A / D converter 65 Image memory 51 CPU 61 CPU 52 RAM 53 ROM 62 RAM 63 ROM

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location G01B 11/00 H

Claims (2)

[Claims] 1. A cloth having a pattern is moved from a predetermined supply position to a photographing position, the cloth is photographed by a camera, the position of the cloth pattern is detected based on image processing of the obtained image data, and the detected pattern is detected. In a pattern matching device that corrects the position of the fabric based on the position of the pattern and moves to a predetermined position, input means for designating the characteristic of the pattern to be detected by image processing, and image processing of the pattern having the characteristic designated by this input means. The pattern matching device is provided with a control means for correcting the position of the cloth on the basis of the detected position of the pattern and moving it one by one to a predetermined position. 2. As the characteristics of the pattern specified by the input means, it is possible to specify a pattern position from a cloth edge position, a pattern thickness, a pattern search range, or a pattern light / dark type with respect to the background of the cloth. The pattern matching device according to claim 1, wherein the pattern matching device is characterized in that: