TWI637157B - Sprocket wheel inspection method and apparatus - Google Patents

Abstract

A sprocket detecting method for detecting a degree of yaw when a sprocket wheel is rotated, the sprocket detecting method comprising: setting the sprocket wheel to be detected to a first position and rotating; The taking unit is disposed at a second position, and the side of the rotating toothed disc is photographed to obtain a plurality of captured images, each of the captured images includes a background image area and a side surface area of the toothed disc; defining the side image area of the toothed disc The plurality of pixels in the plurality of pixels are complex sampling pixels, and according to the degree of change of one of the sampling pixels between the side image areas of the toothed discs of different captured images, as a basis for detecting the degree of the yaw, thereby making the degree of yaw The detection is more precise and fast, and avoids the disadvantages of being inaccurate and laborious by manual visual inspection.

Description

Sprocket detection method

The present invention relates to a method of detecting a toothed disc, and more particularly to a method of detecting a toothed disc by detecting a side of a rotating toothed disc and changing a pixel point of the captured image as a basis for detecting the degree of yaw.

A toothed disc, such as a bicycle's shifting sprocket, if there is a problem such as unevenness or deformation of the disc surface in the eighth figure, the sprocket (1B) will have a yaw problem when it is rotated. If the yaw is too large, Pulling the chain, making noise, etc.

Conventionally, the method of detecting the yaw degree of the sprocket wheel is mostly carried out by visual inspection. The sprocket wheel is mounted on a rotating shaft. When the rotating shaft rotates to drive the sprocket wheel to rotate, the slanting or yaw degree of the sprocket wheel is visually checked. Too large, however, this type of manual detection is labor intensive, and there is a problem that the judgment is less accurate due to human factors.

At present, there is a patent pending case of the Republic of China New Patent Bulletin No. 202795 "Bicycle sprocket computer-assisted yaw detecting device". The pre-look is generally based on a laser measuring device at the top of one of the spur-correcting machines. a head, the probe is aligned with the circumference of the workpiece to be tested, and an angle meter is arranged on the side frame of the rotating shaft for measuring the angle of rotation of the rotating shaft; a computer control unit and a control box including a laser probe a signal amplifier for amplifying the signal detected by the laser probe, and a counter for reading the signal of the angular rotation input by the angle meter, the two signals being input into the computer data processing unit to obtain the periphery of the workpiece Hundreds of points of data are calculated, and the yaw amount of the workpiece is determined for yaw determination The reference is used as a reference and is used to actuate the pneumatic valve of the pressing shaft when the yaw amount of the workpiece is less than the set value to allow the workpiece to be unloaded.

However, the above-mentioned pre-cases are too complicated and the organization is more complicated and costly.

Therefore, in order to propose another method for detecting the degree of yaw deflection, the inventors have made research and proposed a method of detecting a sprocket wheel of the present invention for detecting the degree of yaw of a toothed disc when it is rotated. The sprocket detecting method includes: setting the sprocket to be detected to a first position, and rotating the sprocket in the first position; and setting an image capturing unit to a second position, the second position Or facing the side of the sprocket, the image capturing unit captures the side of the rotating sprocket to obtain a plurality of captured images, each of the captured images includes a background image area and a sprocket side image area; The plurality of pixels in the side image area of the disc are complex sampling pixels, and the degree of change of one of the sampling pixels between the side image areas of the toothed discs of different captured images is used as a basis for detecting the degree of the yaw.

Further, the position of the pixel point is represented by an X and Y coordinate system, wherein the distribution direction of the sampling pixel point corresponds to the extending direction of the Y coordinate, and a detection area is defined, and the detection area covers both ends of the side image area of the toothed disk. One of the sampling pixels of the portion, wherein the X coordinate value of a sampling pixel is the largest or smallest in the detection area; the maximum X coordinate value of a sampling pixel or the minimum X coordinate value of a sampling pixel is obtained, wherein The maximum X coordinate value of the sampled pixel is the X coordinate value of the sampled pixel in the detection area where the X coordinate value is the largest, and the minimum X coordinate value of the sampled pixel is the sampling pixel in the detection area. The X coordinate value of the point is the smallest X coordinate value; and the degree of change is the difference between the maximum X coordinate value of the sampling pixel point or the minimum X coordinate value of the sampling pixel point.

Further, the position of the pixel point is represented by an X and Y coordinate system, wherein the distribution direction of the sampling pixel point corresponds to the extending direction of the Y coordinate, and a detection line is defined, and the detection line is parallel to the extending direction of the X coordinate, and the detection is performed. The line corresponds to the sampling pixel of one of the two ends of the side surface of the sprocket wheel, and the X coordinate value of one sampling pixel is the largest or the smallest value on the detection line; the maximum X coordinate value or a sampling of a sampling pixel point is obtained. a minimum X coordinate value of the pixel, wherein the maximum X coordinate value of the sampled pixel is the X coordinate value of the largest X coordinate value of the sampled pixel on the detection line, and the minimum X coordinate value of the sampled pixel point The X coordinate value of the sampled pixel in the detection line is the smallest X coordinate value; and the degree of change is the difference between the maximum X coordinate value of the sampling pixel point, or the minimum X coordinate of the sampling pixel point The difference between the values.

Further, the position of the pixel point is represented by an X and Y coordinate system, wherein the distribution direction of the sampling pixel point corresponds to the extending direction of the X coordinate, and a detection area is defined, and the detection area covers both ends of the side image area of the toothed disk. In one of the sampling pixels of the portion, the Y coordinate value of a sampling pixel in the detection area is the maximum or minimum; the maximum Y coordinate value of a sampling pixel or the minimum Y coordinate value of a sampling pixel is obtained, wherein The maximum Y coordinate value of the sampled pixel is the Y coordinate value of the sample with the Y coordinate value in the sampling area, and the minimum Y coordinate value of the sampled pixel is the sampling pixel in the detection area. The Y coordinate of the point is the minimum Y coordinate value; and the degree of change is the difference between the maximum Y coordinate value of the sampled pixel point or the minimum Y coordinate value of the sampled pixel point.

Further, the position of the pixel point is represented by an X and Y coordinate system, wherein the distribution direction of the sampling pixel point corresponds to the extending direction of the X coordinate, and a detection line is defined, and the detection line is parallel to the extending direction of the Y coordinate. The line corresponds to the sampling pixel of one of the two ends of the side surface of the toothed disc, and the Y coordinate of the sampling pixel is the largest or the smallest value on the detection line; the maximum Y coordinate value or a sampling of the sampling pixel is obtained. The minimum Y coordinate value of the pixel, wherein the maximum Y coordinate value of the sampled pixel is the Y of the sampled pixel on the detection line with the Y coordinate value being the largest. The coordinate value, the minimum Y coordinate value of the sampled pixel is the Y coordinate value of the smallest Y coordinate value of the sampling pixel on the detection line; and the degree of change is the maximum Y coordinate value of the sampling pixel The difference between the gaps or the minimum Y coordinate values of the aforementioned sampled pixels.

Further, a display interface sequentially displays the captured image, and the pixel points on the display interface correspond to the sampling pixel points of the side image area of the toothed disc and the pixel points of the background image area.

Further, the sprocket wheel is a sprocket set which is formed by parallel arrangement of a plurality of sprocket members of different sizes, and the detection zone only covers the largest sprocket member in the side image area of the sprocket One of the corresponding sampling pixel points at both ends.

Further, the sprocket wheel is a sprocket set which is formed by parallel arrangement of a plurality of sprocket members of different sizes, and the detection line only corresponds to the largest sprocket member in the side image area of the sprocket One of the corresponding sampling pixel points at both ends.

Further, the degree of change is the degree of change in the distribution position of all or part of the sampled pixel points, or the degree of change in the distribution area.

The present invention also provides a sprocket detecting device for performing the foregoing sprocket detecting method for detecting a degree of yaw when a sprocket wheel is rotated, wherein the sprocket detecting device comprises: the sprocket detecting device provides Positioning or adjusting a fixed first position and a second position; the toothed disc to be detected is disposed in the first position, the toothed disc has a side facing the second position; and a rotating driving unit is connected to the tooth a disk for driving the toothed disc to rotate the toothed disc in the first position; an image capturing unit disposed at the second position for capturing the side of the rotating toothed disc to obtain a plurality of captured images, each Each of the captured images includes a background image area and a side area of a toothed disc; a processing module electrically connected to the image capturing unit to define a plurality of pixel points in the side image area of the toothed disc as a plurality of sampled pixel points, The processing module obtains the sampling pixel points to calculate a degree of change of one of the sampling pixel points between the side image areas of the toothed discs of different captured images to obtain a degree of yaw.

According to the above technical features, the following effects can be achieved:

1. Shooting the side of the rotating toothed disc at a fixed position, by taking the change of the pixel point of the image, and taking the value of the change, the degree of the yaw of the toothed disc can be represented, compared with the method of manual visual inspection. The detection can be faster, more accurate, and does not require too much manpower.

2. By grasping the position of the pixel point corresponding to the toothed disc, it can represent the degree of yaw deflection, and the detection accuracy is very high, and the higher the density of the pixel, the higher the accuracy and detection. .

3. Compared with the known case, the equipment is simpler and the cost can be reduced.

(1000)‧‧‧ sprocket detection device

(1), (D) ‧ ‧ toothed disc

(10) ‧‧‧ side

(21) ‧‧‧First position

(22) ‧‧‧second position

(221) ‧‧‧Adjustment column

(3) ‧‧‧Rotary drive unit

(4) ‧‧‧Image capture unit

(5), (5a), (5b), (5c), (5d), (5e) ‧ ‧ images

(51), (51a), (51b), (51c), (51d), (51e) ‧ ‧ background image area

(52), (52a), (52b), (52c), (52d), (52e) ‧‧ ‧ flank

(521), (521a), (521b), (521c), (521d), (521e) ‧ ‧ s sampling pixels

(5211), (5211a), (5211b), (5211c), (5211d) ‧‧‧Sampling pixel maximum X coordinate value

(5212d), (5212e)‧‧‧Sampling pixel maximum Y coordinate value

(6) ‧‧‧Processing module

(7)‧‧‧Display interface

(8), (8d) ‧ ‧ inspection area

(9)‧‧‧Test line

(A), (B) ‧ ‧ OK words

(C) ‧‧‧NG words

[First Figure] is a schematic view showing the appearance of a toothed disc detecting device according to an embodiment of the present invention.

[Second Picture] In the method of detecting a toothed disc according to the first embodiment of the present invention, the display interface displays a screen (1) of a captured image and a detection result thereof.

[Fig. 2A] is a partial enlarged view of the second figure, showing pixel points in the background image area, and sampling pixel points of the side image area of the toothed disc.

[Third Diagram] In the method of detecting a toothed disc according to the first embodiment of the present invention, the display interface displays a screen view of another captured image and a detection result thereof (2).

[Fourth Diagram] In the method of detecting a toothed disc according to a second embodiment of the present invention, the display interface displays a screen (1) of a captured image and a detection result thereof.

[Fifth Diagram] In the method of detecting a toothed disc according to a second embodiment of the present invention, the display interface displays a screen view of another captured image and a detection result thereof (2).

[Sixth Drawing] In the method of detecting a toothed disc according to a third embodiment of the present invention, the display interface displays a screen (1) of a captured image and a detection result thereof.

[Seventh Drawing] In the method of detecting a toothed disc according to a third embodiment of the present invention, the display interface displays a screen view of another captured image and a detection result thereof (2).

[Eighth image] is a schematic diagram showing the occurrence of yaw during rotation due to factors such as unevenness or deformation of the toothed disc.

In combination with the above technical features, the main effects of the sprocket detecting method of the present invention will be clearly shown in the following embodiments.

Please refer to the first figure, the second figure and the second figure A, and a toothed disc detecting device (1000) is illustrated to explain how to implement the toothed disc detecting method of the first embodiment, and how to detect a tooth. One degree of yaw when the disc (1) is rotated. The sprocket detecting device (1000) includes: a first position (21) and a second position (22) provided by the sprocket detecting device (1000); the sprocket (1) to be detected, set In the first position (21), the toothed disc (1) has a side surface (10) facing the second position (22). In this embodiment, the toothed disc (1) is a set of toothed discs, and the set of toothed discs A plurality of sprocket members (11) of different sizes are arranged in parallel; a rotary drive unit (3), such as a motor, is coupled to the spur (1) to drive the sprocket (1) Rotating the toothed disc (1) in the first position (21); an image capturing unit (4), such as a camera, is disposed in the second position (22) for photographing the rotating toothed disc ( a plurality of captured images (5) of the first side (10) of the first aspect (10), wherein the first position (21) and the second position (22) are fixed or adjustable. In the embodiment, the first position (21) is fixed, and the second position (22) can be adjusted and fixed on an adjustment column (221), and each image captured by the image capturing unit is A shot image (5) contains a background image area (5) 1) and a tooth image side image area (52); a processing module (6) electrically connected to the image capturing unit (4), the processing module (6) may be a soft device disposed on a computer device In the first embodiment, the processing module (6) is disposed on a tablet computer. It should be noted that the toothed disk (1) can be a white background as a background, and the image capture is performed. When the unit (4) photographs the toothed disc (1), the processing module (6) can distinguish the background image area (51) and the side surface area (52) of the toothed disc by a change in light sensitivity, and the definition is located in the tooth. The plurality of pixels in the side image area (52) of the disk are complex sampling pixels (521), and the processing module (6) can obtain the position information of the sampled pixel points (521), A degree of change in one of the sampled pixel points (521) between the side faces of the sprocket wheel (52) of different captured images (5) is calculated to obtain a degree of yaw.

It should be noted that the pixel point and the sampling pixel point (521) may be that the image capturing unit (4) captures the side surface (10) of the toothed disk (1) and stores it in a memory unit (not shown). The stored digital information of the pixel position of the image may also be when the image capturing unit (4) captures the side surface (10) of the toothed disk (1) and displays it on a display interface (7). The displayed digital information of the corresponding image pixel position. In the first embodiment, the processing module (6) is disposed on the tablet computer, and the display interface (7) of the tablet computer sequentially displays the captured image (5), and the display interface (7) The pixel points correspond to the sampled pixel points (521) of the aforementioned sprocket side image area (52) and the pixel points (511) of the aforementioned background image area (51) [as shown in FIG. 2A]. The degree of change may be a degree of change in the distribution position corresponding to all or part of the sampled pixel point (521), or a degree of change in the distribution area.

Referring to the first, second, second and third figures, in the first embodiment, the position of the pixel is represented by an X, Y coordinate system, and the sampling pixel (521) is The distribution direction of the 521a) corresponds to the extending direction of the Y coordinate, and the processing module (6) may perform image processing to make the sprocket side image area (52) (52a) of the captured image (5) (5a) The vertical mode (as shown in the second figure) is displayed on the display interface (7), and the image capturing unit (4) may be set in the second position (22) by appropriate placement. The direct shooting and directing of the side (10) of the chainring (1) in a longitudinal manner [as shown in the second figure] is presented to the display interface (7).

The processing module (6) defines a detection area (8) pre-defined, and the detection area (8) covers sampling pixels (521) of one of the two ends of the side image area (52) (52a) of the sprocket ( 521a), and in the first embodiment, the detection zone (8) only covers one corresponding sampling pixel of the two ends of the largest toothed disk member in the side face image area (52) (521a) of the toothed disk. (521) (521a). In the detection area (8), each of the captured images (5) (5a) has a sampling pixel point (521) (521a) whose X coordinate value is the largest or smallest, and the processing module (6) obtains a sampling pixel point. The maximum X coordinate value (5211) (5211a) or the minimum X coordinate value of a sampled pixel (not shown), The maximum X coordinate value (5211) of the sampled pixel (5211a) is the X coordinate value of the largest X coordinate value of the sampled pixel point (521) (5211a) in the detection area (8), for example, The X coordinate value represented by the imaginary line depicted in the second figure, or the X coordinate value represented by the leftmost sampling pixel point (521) in the detection area (8) of the second figure, and the The minimum X coordinate value of the sampled pixel (not shown) is the X coordinate value of the smallest X coordinate value of the sampled pixel point (521) (521a) in the detection area (8), for example, the detection area of the fourth figure. In (8), the X coordinate value represented by the sample pixel (521a) on the right side.

It should be noted that if the toothed disc (1) has a problem of unevenness, the sprocket (1) may be swayed when rotated, and the obtained captured image (5) (5a) is obtained. The distribution of the background image area (51) (51a) and the sprocket side image area (52) (52a) may vary, and the first embodiment determines the toothed disc based on the aforementioned difference, that is, the degree of change described above. (1) The degree of yaw.

For example, referring to the first, second, second, and third figures, in the first embodiment, the processing module (6) obtains the maximum X coordinate value of the sampled pixel (5211), and As shown in the second figure, the display interface (7) has a value of 644.56, and the sprocket (1) continues to rotate, and the image capturing unit (4) continues to capture the sprocket in the second position (22). On the side of 1), a plurality of captured images (5) (5a) are obtained and sequentially displayed on the display interface (7), and the processing module (6) also obtains sampling of the captured images (5) (5a). The pixel maximum X coordinate value (5211) (5211a), as shown in the third figure, another captured image (5a) and the obtained other sample pixel maximum X coordinate value (5211a), the value of which is 639.38. The processing module (6) obtains a difference between the maximum X coordinate values (5211) (5211a) of the sampled pixel points. [Or other embodiments, the processing module (6) obtains the minimum X coordinate of the sampled pixel points. Value, and the difference between the minimum X coordinate values of the sampled pixel points is obtained], as in the first embodiment, the difference is exactly the maximum X coordinate value (5211) of the sampled pixel point in the second figure, that is, 644.56, and In the third figure, the difference between the maximum X coordinate value (5211a) of the sampled pixel, ie 639.38, is 5.18.

The user can preset a reference value, such as 5.50, when the difference between the maximum X coordinate value (5211) (5211a) of the sampled pixel point exceeds the reference value, indicating the degree of yaw when the toothed disc (1) rotates. If the specification is exceeded, a NG word may be displayed on the display interface (7). In the first embodiment, the difference between the maximum X coordinate value (5211) (5211a) of the sampled pixel is less than the reference value. It means that the degree of yaw when the toothed disc (1) rotates meets the specification requirements, and the display interface (7) is displayed with an OK (A) as shown in the third figure.

Referring to the first, fourth and fifth figures, a method of detecting a toothed disc according to a second embodiment of the present invention is shown, and the same (1), the second, is detected as the first embodiment. The method for detecting the toothed disc of the embodiment is substantially the same as that of the foregoing embodiment, except that the processing module (6) defines a detection line (9) in advance, and the detection line (9) is parallel to the extending direction of the X coordinate. The detection line (9) corresponds to a sampling pixel point (521b) (521c) of one of the two end portions of the side surface area (52b) (52c) of the toothed disc, and preferably only corresponds to the side image area of the toothed disc ( 52b) One of the corresponding sampling pixel points (521b) (521c) of the two ends of the largest toothed disk member in (52c). On the detection line (9), there is a sampling pixel point (521b) (521c) whose X coordinate value is maximum or minimum; and a sampling pixel point maximum X coordinate value (5211b) (5211c) or a sampling pixel point minimum X The coordinate value (not shown), the maximum X coordinate value of the sampled pixel (5211b) (5211c) is the maximum of the X coordinate value of the sampled pixel point (521b) (521c) on the detection line (9) The X coordinate value, such as the X coordinate value represented by the imaginary line depicted in the fourth figure, or the X coordinate value represented by the leftmost sample pixel point (521b) on the detection line (9) of the fourth figure The minimum X coordinate value of the sampled pixel is the X coordinate value of the smallest X coordinate value of the sampled pixel point (521b) (521c) on the detection line (9), for example, the detection line of the fourth figure. (9) The X coordinate value represented by the sample pixel point (521b) on the far right side. The degree of change is the difference between the maximum X coordinate value (5211b) (5211c) of the sampled pixel point or the minimum X coordinate value of the sampled pixel point.

For example, referring to the first, fourth, and fifth figures, in the second embodiment, the processing module (6) obtains the maximum X coordinate value (5211b) of the sampled pixel (5211c) and displays it on The display interface (7) has a value of 644.56, and the sprocket (1) continues to rotate, and the image capturing unit (4) continues to capture the side of the sprocket (1) in the second position (22) (10) ), obtain multiple captured images (5b) (5c), and display them in sequence The display interface (7), the processing module (6) also obtains the sampled pixel point maximum X coordinate value (5211b) (5211c) of the captured image (5b) (5c), as shown in the fifth figure The captured image (5c) and the acquired maximum X coordinate value (5211c) of the sampled pixel have a value of 639.38. The processing module (6) obtains a difference between the maximum X coordinate values (5211b) (5211c) of the sampled pixel points, for example, the difference is exactly the maximum X coordinate value (5211b) of the sampled pixel point in the fourth figure, That is, the difference between 644.56 and the maximum X coordinate value (5211c) of the sampled pixel in the fifth figure, that is, 639.38, is 5.18, and is less than the reference value of 5.50, which represents the rotation of the toothed disc (1). The degree of yaw is in accordance with the specification, and an OK word (B) as shown in the fifth figure is displayed on the display interface (7).

Referring to the sixth and seventh figures, a method of detecting a toothed disc according to a third embodiment of the present invention is to detect another toothed disc (not shown) different from the foregoing embodiment. The method for detecting the toothed disc is substantially the same as that of the foregoing embodiment, except that the distribution direction of the sampling pixel point (521d) (521e) corresponds to the extending direction of the X coordinate, which may be the processing module (6) The image processing causes the sprocket side image area (52d) (52e) of the photographic image (5d) (5e) to be displayed in the horizontal direction on the display interface (7), or the image capturing unit (4) may be via the image capturing unit (4). The appropriate placement mode is set in the second position (22) for shooting, and the direct shooting and the side of the other toothed disc (not shown) are presented in a lateral manner [as shown in the sixth figure]. The display interface (7).

The processing module (6) defines a detection area (8d) pre-defined, and the detection area (8d) covers sampling pixels (521d) of one of the two ends of the side surface area (52d) (52e) of the sprocket ( 521e), preferably only one corresponding sampling pixel point (521d) (521e) of both ends of the largest toothed disk member of the sprocket side image area (52d) (52e) is covered. In the detection area (8d), a sampling pixel point (521d) (521e) has a Y coordinate value of a maximum or a minimum, and the processing module (6) obtains a sampling pixel point maximum Y coordinate value (5212d) (5212e). Or a sample pixel point minimum Y coordinate value (not shown), wherein the sample pixel point maximum Y coordinate value (5212d) (5212e) is the sample pixel point (521d) in the detection area (8d) ( 521e) The Y coordinate value of the largest Y coordinate is the value of the Y coordinate of the largest one, such as the Y coordinate value represented by the imaginary line depicted in the sixth figure, or the seventh figure In the detection area (8d), the X coordinate value represented by the uppermost sampling pixel point (521d), and the minimum Y coordinate value of the sampling pixel point is the sampling pixel point in the detection area (8d) ( In 521d) (521e), the Y coordinate is the smallest Y coordinate value, for example, the Y coordinate value represented by the lowermost sampling pixel (521e) in the detection area (8d) of the seventh figure. The degree of change is the difference between the maximum Y coordinate value (5212d) (5212e) of the sampled pixel point, or the difference between the minimum Y coordinate value of the sampled pixel point.

For example, as shown in the sixth and seventh embodiments, in the third embodiment, the processing module (6) obtains the maximum Y coordinate value (5212d) of the sampled pixel and displays it on the display interface (7). The value is 33.15, and the other toothed disc continues to rotate, and the image capturing unit (4) continues to capture the side of the other toothed disc in the second position (22) to obtain a plurality of captured images (5d) (5e). And sequentially displayed on the display interface (7), the processing module (6) also obtains the maximum Y coordinate value (5212d) of the sampled pixel point (5212e) of the captured image (5d) (5e), as described in The five figures show another captured image (5e) and the obtained maximum sampled pixel point maximum Y coordinate value (5212e), which has a value of 39.23. The processing module (6) obtains a difference between the maximum Y coordinate value (5212d) (5212e) of the sampled pixel point, for example, the difference is exactly the maximum Y coordinate value (5212d) of the sampled pixel point in the sixth figure, That is, the difference between 33.15 and the maximum Y coordinate value (5212e) of the sampled pixel in Fig. 7 (ie, 39.23), which is 6.08, exceeds the user's preset value of 5.50, which represents the other. The degree of yaw when the toothed disc rotates exceeds the specification, and one of the NG characters (C) as shown in the seventh figure is displayed on the display interface (7).

In addition, in other embodiments not shown, the distribution direction of the sampling pixel points is also corresponding to the extending direction of the Y coordinate or the X coordinate, but the detection area or the detection line is not defined, and only the display interface is obtained. The X coordinate value or the Y coordinate value of the sampling point of the X coordinate value or the Y coordinate value of the largest or smallest value is also determined according to the difference between the maximum or minimum X coordinate value or the Y coordinate value of the complex number. The degree of yaw.

However, in the first to third embodiments described above, only the detected image (5) (5a) (5b) (5c) (5d) is detected by the detection area (8) (8d) or the detection line (9). (5e) the side image area of the toothed disc (52) (52a) (52b) (52c) (52d) (52e), the sampling pixel point (521) (521a) (521b) (521c) of one of the two ends of the side surface of the largest toothed member. (521d) (521e), as it most clearly reflects the degree of yaw of the spur (1). And the captured image (5) (5a) (5b) (5c) (5d) (5e) may be, for example, one rotation of the aforementioned toothed disk (1) for taking 360 shots of the captured image (5) (5a) (5b)(5c)(5d)(5e), for detection and judgment, and has more accurate detection results.

In view of the foregoing description of the embodiments, the operation and the use of the present invention and the effects of the present invention are fully understood, but the above described embodiments are merely preferred embodiments of the present invention, and the invention may not be limited thereto. Included within the scope of the present invention are the scope of the present invention.

Claims (8)

A sprocket detecting method for detecting a degree of yaw of a toothed disc, comprising: setting the sprocket to be detected to a first position, and rotating the sprocket in the first position; An image capturing unit is disposed at a second position, the second position is toward a side of the toothed disc, so that the image capturing unit captures the side of the rotating toothed disc to obtain a plurality of captured images, each of which is captured Include a background image area and a side area of a toothed disc; defining a plurality of pixel points in the side image area of the toothed disc as a plurality of sampled pixel points, according to one of the sampled pixel points between the side images of the toothed disc according to different captured images The degree of change is used as a basis for detecting the degree of the yaw, which is the degree of change in the distribution position of all or part of the sampled pixel points, or the degree of change in the distribution area. The method of detecting a toothed disc according to claim 1, wherein the position of the pixel point is represented by an X and Y coordinate system, wherein a distribution direction of the sampling pixel point corresponds to an extending direction of the Y coordinate, and a detection is defined. The detection area covers the sampling pixel of one of the two ends of the side image area of the toothed disc, and the X coordinate value of one sampling pixel in the detection area is the largest or the smallest; the maximum X of the sampling pixel is obtained. a coordinate value or a minimum X coordinate value of a sampled pixel, wherein the maximum X coordinate value of the sampled pixel is the X coordinate value of the sampled pixel in the detection area where the X coordinate value is the largest, and the sampling is performed. The minimum X coordinate value of the pixel is the X coordinate value of the smallest X coordinate value of the sampling pixel in the detection area; and the degree of change is the difference between the maximum X coordinate values of the sampling pixel, or The difference between the minimum X coordinate values of the aforementioned sampled pixel points. The method of detecting a toothed disc according to claim 1, wherein the position of the pixel point is represented by an X and Y coordinate system, wherein a distribution direction of the sampling pixel point corresponds to an extending direction of the Y coordinate, and a detection is defined. a line, the detection line is parallel to the extending direction of the X coordinate, and the detection line corresponds to a sampling pixel of one of the two ends of the side surface of the toothed disc, and the X coordinate of the sampling pixel is the largest on the detection line. Or minimum; obtain a sample pixel point maximum X coordinate value or a sample pixel point a small X coordinate value, wherein the maximum X coordinate value of the sampled pixel is the X coordinate value of the sampled pixel in the detection line where the X coordinate value is the largest, and the minimum X coordinate value of the sampled pixel is The X coordinate value of the sampled pixel on the detection line is the smallest X coordinate value; and the degree of change is the difference between the maximum X coordinate value of the sampled pixel point, or the minimum X coordinate value of the sampled pixel point. The gap between the two. The method of detecting a toothed disc according to claim 1, wherein the position of the pixel point is represented by an X and Y coordinate system, wherein a direction of distribution of the sampled pixel point corresponds to an extending direction of the X coordinate, and a detection is defined. The detection area covers the sampling pixel of one of the two ends of the side image area of the toothed disc, and the Y coordinate value of one sampling pixel in the detection area is the largest or the smallest; obtaining a sampling pixel point maximum Y a coordinate value or a minimum Y coordinate value of a sampled pixel, wherein the maximum Y coordinate value of the sampled pixel is a Y coordinate value of a sample having the largest Y coordinate value in the sampling pixel in the detection area, and the sampling is performed. The minimum Y coordinate value of the pixel is the Y coordinate value of the smallest Y coordinate value of the sampling pixel in the detection area; and the degree of change is the difference between the maximum Y coordinate value of the sampling pixel, or The difference between the minimum Y coordinate values of the aforementioned sampled pixel points. The method of detecting a toothed disc according to claim 1, wherein the position of the pixel point is represented by an X and Y coordinate system, wherein a direction of distribution of the sampled pixel point corresponds to an extending direction of the X coordinate, and a detection is defined. a line, the detection line is parallel to the extending direction of the Y coordinate, and the detection line corresponds to a sampling pixel of one of the two ends of the side surface of the toothed disc, and the Y coordinate of the sampling pixel is the largest on the detection line. Or minimum; obtain a sampling pixel point maximum Y coordinate value or a sampling pixel point minimum Y coordinate value, wherein the sampling pixel point maximum Y coordinate value is the sampling point of the detection line in the Y coordinate value is the largest The Y coordinate value, the minimum Y coordinate value of the sampled pixel is the Y coordinate value of the smallest Y coordinate value of the sampling pixel on the detection line; and the degree of change is the maximum Y coordinate of the sampling pixel The difference between the values, or the difference between the minimum Y coordinate values of the aforementioned sampled pixels. The method for detecting a sprocket according to claim 1, wherein a display interface sequentially displays the captured image, and the pixel on the display interface corresponds to a sampling pixel of the side image area of the sprocket and The pixel of the aforementioned background image area. The method of detecting a toothed disc according to claim 2, wherein the sprocket wheel is a sprocket set, and the sprocket set is formed by parallelizing a plurality of sprocket members of different sizes. The detection zone only covers one of the corresponding sampling pixel points of the two ends of the largest toothed disc member in the side image area of the toothed disc. The method of detecting a toothed disc according to the third or fifth aspect of the invention, wherein the sprocket wheel is a sprocket set, and the sprocket set is formed by parallelizing a plurality of sprocket members of different sizes, and The detection line is only corresponding to one of the sampling pixel points of the two ends of the largest toothed disc member in the side image area of the toothed disc.