TW202020398A - Fiber three-dimensional measuring device and method thereof - Google Patents

Abstract

A fiber three-dimensional measuring device comprises a fiber loading platform, at least two sets of image capturing devices, a processor and a storing element. The fiber loading platform hangs on at least one fiber to be measured. The image capturing devices capture two-dimensional images of the at least one fiber. The processor receives the two-dimensional images captured by the image capturing device and constructs a fiber three-dimensional model according to the two-dimensional images. The storing element stores the three-dimensional model. The image capturing device further comprises a two-dimensional image capturing element and a light projecting element. The two-dimensional image capturing element captures the two-dimensional images. The light projecting element and the two-dimensional image capturing element are disposed corresponding to the fiber loading platform.

Description

Fiber three-dimensional measuring device and method

The invention relates to a device and a method for three-dimensional measurement of fibers, and in particular to a device and method for measuring the number of crimps (Crimp Number) contained in fibers and related values.

In the textile industry, there are many indicators that can reflect the quality of the fiber. Among them, the number of crimps contained in the fiber and their related values, such as the bending length and bending angle of the fiber, are used to affect the friction, cohesion and yarn formation of the fiber. The key to quality.

Generally, different denier (Denier) numbers will be used according to the purpose of the fiber. With the increase in demand for high-performance fabrics, the production capacity of extremely fine Danny fibers has gradually increased. At present, the textile industry mostly uses artificial methods to sample fibers and use The human eye calculates the number of fibers curled per unit distance one by one. However, using the human eye for fiber testing will have the following problems: (1) Human eye fatigue or human factors can easily cause errors in the measurement results; (2) Slow inspection speed leads to poor measurement rate; (3) Regular confirmation of personnel is required Whether the appraisal and calculation standards adopted between the two are consistent, so as to reduce the inconsistency of the fiber curl number of different batches due to human error; (4) manual data recording is required, which also increases the probability of recording errors; (5) fiber warp After destructive measurement, for example, the fiber is heavily loaded, it is difficult to check again whether the measurement result of the fiber is correct.

Therefore, how to quickly measure fibers, improve the efficiency of fiber inspection and save manpower is a joint effort of those skilled in the art.

The invention provides a device and method for three-dimensional fiber measurement. The three-dimensional measurement device and method can provide a three-dimensional model of the fiber, and can provide the number of curls contained in the fiber and related values.

The invention provides a three-dimensional fiber measuring device, which is suitable for providing a three-dimensional fiber model. The fiber three-dimensional measuring device includes a fiber carrying platform, at least two sets of image capturing devices, a processor and a storage unit. The fiber bearing platform is used to mount at least one fiber to be tested. At least two sets of image capturing devices are used to capture the two-dimensional image of the at least one fiber to be tested. The processor receives the two-dimensional image captured by the image capturing device and creates a three-dimensional fiber model based on the two-dimensional image. The storage unit is used to store the three-dimensional model of the fiber. The image capturing device further includes a two-dimensional image capturing unit and a light projecting unit. The two-dimensional image capturing unit is used to obtain the two-dimensional image. The light projection unit and the two-dimensional image capturing unit are arranged correspondingly with the fiber bearing platform as the center.

The present invention also provides a method for measuring a three-dimensional model of a fiber, which includes the steps of mounting at least one fiber to be tested on a fiber carrying platform, and capturing the at least one object with at least two sets of two-dimensional image capturing units with different shooting angles The step of measuring the two-dimensional image of the fiber, the step of creating a three-dimensional model based on the two-dimensional images of different shooting angles, using the three-dimensional coordinates of the three-dimensional model to convert to a coordinate sequence and performing a second-order differential calculation on the coordinate sequence to produce The steps of a second-order differential calculation result, and using the second-order differential calculation result to determine the curl position of the at least one fiber to be tested, and calculating the curl number, bending length and bending of the at least one fiber to be tested according to the curl positions Angle steps.

Based on the above, in the device and method for three-dimensional fiber measurement of the present invention, by establishing a three-dimensional model of the fiber, the fiber curl number and its related value with low error rate and consistent standards can be quickly obtained, and the three-dimensional model can be directly stored to avoid Man-made recording errors and the inability to review the fiber measurement results again.

In order to make the above-mentioned features and advantages of the present invention more obvious and understandable, the embodiments are specifically described below and described in detail in conjunction with the accompanying drawings.

FIG. 1 is a schematic diagram of a three-dimensional fiber measuring device according to an embodiment of the invention. Please refer to FIG. 1. In this embodiment, the three-dimensional fiber measuring device includes two sets of image capturing devices 1100, a fiber carrying platform 1200, a processor 1300 and a storage unit 1400. The fiber carrying platform 1200 is used to mount the fiber to be tested 1202. In this embodiment, for convenience of description, only one fiber to be tested 1202 is mounted, but the present invention is not limited thereto, and the present invention can also mount multiple fibers to be tested at the same time For batch measurement. The image capturing device 1100 is used to capture the two-dimensional image of the fiber 1202 to be tested. After the processor 1300 receives the two-dimensional image captured by the image capturing device 1100, the three-dimensional model of the fiber is created according to the two-dimensional image and the fiber is three-dimensional The model is analyzed, and the storage unit 1400 stores the three-dimensional fiber model and related analysis results. The storage unit 1400 may be a storage directly connected to the processor, an external database serially connected to the back end, or a cloud database using wireless transmission. The present invention is not limited thereto.

Each group of image capturing devices 1100 includes a two-dimensional image capturing unit 1102 and a light projecting unit 1104, wherein the light projecting unit 1104 and the two-dimensional image capturing unit 1102 of the same group of image capturing devices 1100 are based on a fiber carrying platform 1200 The corresponding configuration is centered, which means that the light projecting unit 1104 projects light to the fiber carrying platform 1200, and the two-dimensional image capturing unit 1102 takes two-dimensional images by facing the light projecting direction, as shown in FIG. 1 The light projection unit 1104 and the two-dimensional image capturing unit 1102 circled in the same dotted line style represent the same group of image capturing devices 1100. The two-dimensional image capturing unit 1102 is, for example, a color camera or a monochromatic camera. The light beam projected by the light projecting unit 1104 may be a parallel light beam to highlight the outline of the fiber image, and the fiber carrying platform 1200 may be a transparent flat plate to enable the light projecting unit The light beam projected at 1104 passes, but the present invention is not limited to this. The three-dimensional fiber measurement device may further include a display device 1500 for displaying the three-dimensional fiber model and related analysis results on the display device 1500 for the measurement personnel to view the measurement results. In addition, the image capturing device 1100 may further include a control unit (not shown) for controlling the two-dimensional image capturing unit 1102 to perform image capturing and controlling the light projecting unit 1104 to perform light projection. In one embodiment, the control unit controls the light projecting unit 1104 to continuously project light during the 2D image capturing unit 1102. In another embodiment, the control unit controls the light projecting unit 1104 to the same group of 2D images The image capturing unit 1102 performs synchronous light projection during image capturing, or other approximate image capturing light projection control method, but the present invention is not limited to this. Alternatively, the function of the control unit may be directly executed by the processor 1300, and the processor 1300 controls the light projection and imaging of the light projecting unit 1104 and the two-dimensional image capturing unit 1102, but the present invention is not limited thereto. The light projecting unit 1104 projects light toward the fiber carrying platform 1200, for example, projecting a parallel beam; and the two-dimensional image capturing unit 1102 performs a two-dimensional image capturing of the at least one fiber to be tested facing the light projecting direction.

In this embodiment, the angle of view of the two-dimensional image capturing unit 1102 in the two sets of image capturing devices 1100 is 90 degrees, but in another embodiment, the two-dimensional image capturing in the two sets of image capturing devices 1100 The viewing angle difference of the image unit 1102 is not 90 degrees, and the invention is not limited thereto.

FIG. 2 is a schematic diagram of a three-dimensional fiber measuring device according to another embodiment of the present invention. The fiber three-dimensional measuring device in FIG. 2 is similar to the fiber three-dimensional measuring device in FIG. 1. The difference is that in the embodiment of FIG. The three-dimensional measurement device includes three sets of image capturing devices 1100. Each set of image capturing devices 1100 includes a two-dimensional image capturing unit 1102 and a light projecting unit 1104. The light projecting units 1104 and two of the same group of image capturing devices 1100 The one-dimensional image capturing unit 1102 is correspondingly arranged with the fiber supporting platform 1200 as the center. The light projection unit 1104 and the two-dimensional image capturing unit 1102 circled by the same dotted pattern are the same group of image capturing devices 1100. However, the present invention is not limited to this. The image capturing device of the present invention can be configured with more groups according to requirements. It is worth mentioning that the present invention only needs at least two sets of image capturing devices and their shooting angles are different.

FIG. 3 is a flow chart of the steps of a three-dimensional fiber measurement method according to an embodiment of the invention. Please refer to Figure 1, Figure 2 and Figure 3 at the same time. The three-dimensional fiber measurement method of Figure 3 can be applied to at least the three-dimensional fiber measurement device of any of the above embodiments. The following description will be applied to the first Figure An example of a three-dimensional fiber measuring device. In the embodiment of FIG. 3, in step S3100, a fiber to be tested 1202 is mounted on a fiber carrying platform 1200, and the fiber to be tested 1202 can be mounted manually or with an automatic mechanism. In this embodiment, one fiber is mounted, but multiple fibers can also be mounted for measurement. Then, after step S3100 is completed, step S3200 is executed to capture the two-dimensional image of the fiber 1202 to be tested with two sets of two-dimensional image capturing units 1102 with different shooting angles. In step S3200, the light projection unit 1104 can be controlled to continuously project light during the acquisition of the two-dimensional image acquisition unit 1102, or the light projection unit 1104 can be controlled only when the corresponding two-dimensional image acquisition unit 1102 takes an image. Simultaneous projection of light to avoid interference between image capturing devices 1100 of different groups.

After step S3200 is completed, step S3300 is executed to create a fiber three-dimensional model based on two-dimensional images with different viewing angles. In this step, you can first perform image processing such as noise filtering and fiber contour detection on the 2D image, and then capture the 2D coordinate information of the fiber in the 2D image of each view, and then use the two The three-dimensional image is regarded as different projection planes in three-dimensional space, and the two-dimensional coordinate information of the fiber is combined into a three-dimensional model of the fiber. FIG. 4 is a schematic diagram of establishing a fiber 3D model based on 2D images with different viewing angles according to an embodiment of the present invention. In the embodiment of FIG. 4, the viewing angle difference between the two sets of 2D image capturing units 1102 is 90 degrees. The plane captured by the two-dimensional image capturing unit 1102 on the left is regarded as a projection plane (for example, YZ plane P2) in three-dimensional space, and the plane captured by the two-dimensional image capturing unit 1102 on the right is regarded as another plane in three-dimensional space A projection plane (eg, XZ plane P1). Therefore, in the two-dimensional image captured by the two-dimensional image capturing unit 1102 on the left, the two-dimensional coordinates of the fiber are (x _l , y _l ), and in the two-dimensional image captured by the right two-dimensional image capturing unit 1102 , The two-dimensional coordinate of the fiber is (x _r , y _r ). Using the concept of spatial projection, the x _r value of the fiber's two-dimensional coordinates is taken as the x value of the fiber's three-dimensional model, the fiber's two-dimensional coordinate x _l value is taken as the fiber's y value of the three-dimensional model, and the fiber's two-dimensional coordinate y As the z value of the three-dimensional fiber model, _l or y _r can be used to create a three-dimensional fiber model containing three-dimensional information (x, y, z).

In another embodiment, the two-dimensional two-dimensional image capturing unit has a viewing angle difference of not 90 degrees, and the image space of the two two-dimensional images can be first transposed to a viewing angle difference of 90 degrees. The spatial coordinates of the image unit are used to calculate the viewing angle difference, and then one of the 2D images is spatially transposed according to the viewing angle difference so that the viewing angle difference between the two 2D images is 90 degrees. Three-dimensional model of fiber with three-dimensional information (x, y, z).

In yet another embodiment, the fiber measurement device takes multiple sets of 2D image acquisition units with arbitrary viewing angle differences to acquire images, and after the 2D image acquisition unit acquires 2D images with different viewing angles, performs 2D image acquisition Feature point extraction, and match the feature points of the two-dimensional image of each angle of view. Then, the plane conversion matrix of the two-dimensional image is obtained according to the matched feature points, and then the camera matrix is obtained. Finally, a fiber three-dimensional model f is established according to the camera matrix and the multiple two-dimensional images. The processor 1300 can calculate the curl number, bending length and bending angle of the fiber to be measured according to the fiber three-dimensional model f , as described in the following steps S3400, S3500 and related chapters.

…… 式(1)After step S3300 is completed, step S3400 is executed. In step S3400, the processor 1300 can convert the three-dimensional coordinates of the fiber three-dimensional model f into a coordinate sequence and perform a second-order differential calculation on the coordinate sequence to produce a first-order and second-order differential calculation result. First, the three-dimensional coordinates of the fiber three-dimensional model f are converted into a coordinate sequence, and then the second-order differential calculation of the coordinate sequence is as shown in equation (1) to analyze the x and y coordinate changes, and the second-order differential results are generated for subsequent fibers The calculation of the number of curls.

…… Formula 1)

，如式(2)。

…..式(2)After step S3400 is completed, step S3500 is executed, the second-order differential calculation result is used to determine the curl position of the fiber to be measured, and the curl number, bending length, and bending angle of the fiber to be tested are calculated according to the curl position. The local extreme value of the coordinate of the three-dimensional model f of the fiber changes in the x and y directions, for example, the maximum or minimum value is the candidate position 500 of the fiber curl, as shown in FIG. 5, which is defined in an embodiment of the present invention Schematic diagram of the crimping position and bending angle of the fiber. When the second-order differential value of the candidate position 500 exceeds a predetermined threshold, the candidate position can be defined as the crimped position of the fiber, and the effective crimp identified by the user can be flexibly selected by whether the predetermined position exceeds the predetermined threshold. Then, the number of crimps per unit height can be calculated according to the crimp position of the fiber, and the number of crimps per unit height is defined as the number of crimps of the fiber. The angle between the tangents of the fibers on each side of each curling position is the bending angle θ corresponding to the effective curl. In addition, the fiber length between two adjacent curling positions is defined as the bending length. Each curling position can correspond to at most Up to two bending lengths. The calculation of the bending length, for example, the index of the coordinate sequence of the two curling positions A and B in the fiber three-dimensional model is I _A and I _{B. The} sum of the distances between all the adjacent coordinates between the above coordinate sequences is regarded as the bending length

, As in formula (2).

….. formula (2)

In summary, in the fiber three-dimensional measuring device and method of the present invention, at least two sets of two-dimensional image capturing units with different shooting angles are used to capture at least one two-dimensional image of the fiber to be tested, and The two-dimensional image creates a three-dimensional model of the fiber. The processor can determine the curl position of the fiber to be tested according to the three-dimensional model of the fiber, and can further calculate the curl number, bending length and bending angle of the fiber to be tested, and the storage unit can The measurement results are stored.

Although the present invention has been disclosed as above with the embodiments, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be subject to the scope defined in the appended patent application.

1100: Image capture device 1102: Two-dimensional image capture unit 1104: Projection unit 1200: Fiber carrying platform 1202: Fiber to be tested 1300: Processor 1400: Storage unit 1500: Display device S3100~S3500: Step P1: XZ plane P2: YZ plane 500: candidate position θ: bending angle A, B: curling position f : fiber three-dimensional model

FIG. 1 is a schematic diagram of a three-dimensional fiber measuring device according to an embodiment of the invention. FIG. 2 is a schematic diagram of a three-dimensional fiber measuring device according to another embodiment of the invention. FIG. 3 is a flowchart of the steps of three-dimensional fiber measurement according to an embodiment of the invention. FIG. 4 is a schematic diagram of establishing a three-dimensional fiber model according to two-dimensional images with different shooting angles according to an embodiment of the present invention. FIG. 5 is a schematic diagram of defining a crimping position and a bending angle of fibers according to an embodiment of the invention.

S3100-S3500: steps

Claims (18)

A three-dimensional fiber measuring device includes: a fiber carrying platform for mounting at least one fiber to be tested; at least two sets of image capturing devices for capturing two-dimensional images of the at least one fiber to be tested; and a processor , Receiving the two-dimensional images captured by the image capturing devices and creating a fiber three-dimensional model based on the two-dimensional images; and a storage unit for storing the fiber three-dimensional model; wherein the image capturing devices Each group of image capturing devices includes: a two-dimensional image capturing unit for obtaining the two-dimensional image; and a light projecting unit, the light projecting unit and the two-dimensional image capturing unit are centered on the fiber bearing platform Configure accordingly. The three-dimensional fiber measuring device as described in item 1 of the patent application, wherein the light projection unit projects a parallel beam, and the light projection direction of the light projection unit is opposite to the image capturing direction of the two-dimensional image capturing unit . The three-dimensional fiber measuring device as described in item 1 of the patent scope, wherein the image capturing device further includes a control unit for controlling the projection unit to continue during the corresponding two-dimensional image capturing unit Projecting light or controlling the projecting unit to perform projected light synchronously when the corresponding two-dimensional image capturing unit performs image capturing. The three-dimensional fiber measuring device as described in item 1 of the patent application range, wherein the processor calculates the number of crimps, the bending length and the bending angle of the at least one fiber to be tested according to the three-dimensional fiber model. The fiber three-dimensional measuring device as described in item 4 of the patent application scope, wherein the fiber three-dimensional measuring device further includes a display device for displaying the fiber three-dimensional model and the crimp number and bending length of the at least one fiber to be tested And the calculation result of the bending angle. The three-dimensional fiber measuring device as described in item 1 of the patent application, wherein the storage unit is a storage, an external database, or a cloud database directly connected to the processor. A method for measuring a three-dimensional model of a fiber, comprising: mounting at least one fiber to be tested on a fiber carrying platform; capturing the two-dimensional of the at least one fiber to be tested with at least two sets of two-dimensional image capturing units with different shooting angles Image; based on the two-dimensional images of different perspectives to create a three-dimensional model of the fiber; using the three-dimensional coordinates of the three-dimensional model of the fiber into a coordinate sequence and the second-order differential calculation of the coordinate sequence to produce a first- and second-order differential calculation results; and The curling position of the at least one fiber to be tested is determined by using the second-order differential calculation result, and the curling number, bending length and bending angle of the at least one fiber to be tested are calculated according to the curling positions. The measurement method as described in item 7 of the patent application scope, wherein the step of using the second-order differential calculation result to determine the curl position of the at least one fiber to be tested further includes determining according to whether the local extreme value of the second-order differential exceeds a predetermined threshold The crimping position of the at least one fiber to be tested. The measurement method as described in item 7 of the patent application scope, wherein the step of calculating the number of crimps of the at least one fiber to be tested based on the crimp positions further includes calculating the number of crimps per unit height based on the crimp positions, and applying the The number of crimps per unit height is defined as the number of crimps of the at least one fiber to be tested. The measurement method as described in item 7 of the patent application scope, wherein the step of calculating the number of crimps of the at least one fiber to be tested according to the crimping positions further includes dividing the total number of the crimping positions by the at least one fiber to be tested The total length is defined as the number of crimps of at least one fiber to be tested. The measurement method as described in item 7 of the patent application scope, wherein the step of calculating the bending angle of the at least one fiber to be tested based on the crimp positions further includes the fiber on both sides of each crimp position of the crimp positions The angle between tangents is defined as the bending angle. The measurement method as described in item 7 of the patent application scope, wherein the step of calculating the bending length of the at least one fiber to be tested according to the crimp positions further includes adjoining the coordinate sequence according to the coordinates of the crimp positions The sum of the distances between all adjacent coordinates between the two curling positions is defined as the bending length. The measurement method as described in item 7 of the patent application scope, wherein the step of creating a three-dimensional fiber model based on the two-dimensional images with different viewing angles further includes: when two sets of two-dimensional images in the at least two sets of two-dimensional image acquisition units When the shooting angle of view of the image capturing unit differs by 90 degrees, the first direction coordinate value of the at least one fiber to be measured in the first two-dimensional image captured by the first group of two-dimensional image capturing units is used as the first The coordinate value in one direction; the coordinate value of the first direction of the fiber to be measured in the second two-dimensional image captured by the second group of two-dimensional image acquisition units is taken as the coordinate value of the second direction of the three-dimensional model of the fiber; The second direction coordinate value of the at least one fiber to be measured in a two-dimensional image or the second two-dimensional image is used as the third direction coordinate value of the three-dimensional model. The measurement method as described in item 7 of the patent application scope, wherein the step of creating a three-dimensional fiber model based on the two-dimensional images with different viewing angles further includes: when two sets of two-dimensional images in the at least two sets of two-dimensional image acquisition units When the shooting angle difference of the image capturing unit is not 90 degrees, the two-dimensional images are spatially transformed to a shooting angle difference of 90 degrees; the first two-dimensional image captured by the first group of two-dimensional image capturing units The first direction coordinate value of the at least one fiber to be measured in the image is used as the first direction coordinate value of the three-dimensional model of the fiber; the at least one to-be-measured in the second two-dimensional image captured by the second group of two-dimensional image capturing units The first direction coordinate value of the fiber is used as the second direction coordinate value of the three-dimensional model of the fiber; and the second direction coordinate value of the at least one fiber to be measured in the first two-dimensional image or the second two-dimensional image is used as the three-dimensional fiber The coordinate value of the third direction of the model. The measurement method as described in item 7 of the patent application scope, wherein the step of creating a three-dimensional fiber model based on the two-dimensional images of different perspectives further includes: extracting feature points of the two-dimensional images of the different perspectives, And perform matching operations on the feature points; obtain a plane conversion matrix of the two-dimensional images according to the matched feature points, and then obtain a camera matrix of the two-dimensional image capturing units; and acquire images based on the two-dimensional images The camera matrix of the unit and the two-dimensional images create a three-dimensional model of the fiber. The measurement method as described in item 7 of the patent application scope, wherein the step of capturing the two-dimensional image of the at least one fiber to be tested further includes projecting a parallel beam from the two-dimensional image capturing unit toward the fiber carrying platform so that The two-dimensional image capturing unit captures the at least one fiber to be tested in the direction of projecting light. The measurement method as described in item 16 of the patent application scope, wherein the parallel beam is continuously projected. The measurement method as described in item 16 of the patent application scope, wherein the projected parallel light beam is synchronously projected when the two-dimensional image capturing unit captures an image.

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