TW202143106A - Method and system for inspecting bicycle frame - Google Patents

Abstract

A method and a system for inspecting a bicycle frame are provided. The bicycle frame is fixed on a plane, wherein a seat tube of the bicycle frame and a top tube or a down tube of the bicycle frame define the plane. A location of the bicycle frame on the plane is obtained. At least one image capturing devices are simultaneously or in turn moved to respective positions corresponding to a plurality of feature points of the bicycle frame according to design parameters of the bicycle frame. An image of each of the feature points is captured by the image capturing device at the corresponding feature point. A coordinate value of each of the feature points relative to the image capturing device is calculated according to a position of each of the feature points in the image. An actual coordinate value of each of the feature points is calculated according to the image-capturing position of each of the image capturing devices and the coordinate value of each of the feature points relative to the image capturing device. Measurement values or angle values of the bicycle frame are calculated according to the actual coordinate value of each of the feature points.

Description

Method and system for detecting bicycle frame

The present invention relates to a detection method and system, and particularly relates to a detection method and system of a bicycle frame.

With the rapid development of science and technology, material culture and quality of life continue to improve, sports and leisure activities are becoming a trend, among which bicycle sports are becoming more and more popular. In order to ensure that the geometry and size of the bicycle frame produced are consistent with the original design, after the bicycle frame is manufactured, the geometry and size of the bicycle frame need to be tested, and the bicycle frame with excessive error should be eliminated. At present, in the bicycle industry manufacturing process, the geometric shape and size of the bicycle frame are inspected manually. Not only is the accuracy of the inspection often reduced due to human factors, but also because it is necessary to install some jigs to assist the manual measurement , It must consume more time. In addition, three-dimensional scanning equipment is also used to scan the shape of the bicycle frame, and the point cloud model of the bicycle frame obtained after scanning is used for geometric shape and size detection. However, the three-dimensional scanning equipment is very expensive and the scanning is quite time-consuming, which is not conducive to Perform a full inspection.

The invention provides a detection method and system for a bicycle frame, which can accurately and quickly detect the offset of the bicycle frame.

The detection method of the bicycle frame of the present invention includes the following steps. The bicycle frame is fixed on a plane, wherein the central axis of a riser of the bicycle frame and the central axis of a lower tube or an upper tube of the bicycle frame define the plane. Get the position of the bicycle rack on the plane. According to the design parameters of the bicycle frame, at least one image capturing device is simultaneously or sequentially moved to positions corresponding to a plurality of characteristic points of the bicycle frame on the plane. An image of the corresponding feature point is captured at each feature point by the image capturing device. According to the position of each feature point in the image, a landmark of each feature point relative to the corresponding image capturing device is calculated. According to the image capturing position of each image capturing device and the coordinates of each feature point relative to the corresponding image capturing device, an actual coordinate of each feature point on the plane is calculated. The size value or angle value of the bicycle frame is calculated according to the actual coordinates of each feature point. The principle of using single or multiple image capturing devices is the same. The only difference is that when a single image capturing device is used, it takes a long time to move to different feature point positions to capture images in sequence. Using multiple image capturing devices, because they are already located at the preset feature point capturing positions, images can be captured at the same time without moving, and the time is faster.

In an embodiment of the present invention, the steps of fixing the bicycle frame on a plane and obtaining the position of the bicycle frame on the plane include: fixing the central axis of a bottom bracket of the bicycle frame to a vertical position at a predetermined position on the plane.于面。 In the plane. A certain rotational angle position along the central axis of the five-way pipe is used to fix the vertical pipe or the down pipe at a predetermined position.

In an embodiment of the present invention, the steps of fixing the bicycle frame on a plane and obtaining the position of the bicycle frame on the plane include: fixing the stand pipe and the down pipe at two predetermined positions on the plane, and making the center of the stand pipe The shaft and the central axis of the down tube are parallel to the plane.

In an embodiment of the present invention, the step of fixing the bicycle frame on a plane includes: supporting two of the upper tube, the lower tube, and the stand tube on the plane, and making one of the upper tube, the lower tube, and the stand tube The central axis of two is parallel to the plane.

In an embodiment of the present invention, the step of obtaining the position of the bicycle frame on a plane includes detecting the position of the central axis of a bottom bracket of the bicycle frame and any characteristic point on the plane.

The detection system of the bicycle frame of the present invention includes a fixing device, at least one image capturing device and a calculation unit. The fixing device is suitable for fixing a bicycle frame on a plane, wherein the central axis of a vertical tube of the bicycle frame and the central axis of a lower tube or an upper tube of the bicycle frame define the plane. The image capturing device is adapted to simultaneously or sequentially move to positions corresponding to a plurality of feature points of the bicycle frame on the plane according to the design parameters of the bicycle frame, wherein the image capturing device is adapted to capture corresponding features at each feature point An image of a point in which a specific part of the bicycle frame is fixed by a fixing device or a specific part of the bicycle frame is captured by at least one image capturing device to obtain the position of the bicycle frame on a plane. The calculation unit is adapted to calculate the landmark of each feature point relative to the corresponding image capturing device according to the position of each feature point in the image, and is suitable for calculating the image capturing position of each image capturing device and each feature point relative to the corresponding The coordinates of the image capturing device calculates an actual coordinate of each feature point on the plane, and is suitable for calculating at least one size value or at least one angle value of the bicycle frame according to the actual coordinate of each feature point.

In an embodiment of the present invention, the above-mentioned fixing device is adapted to fix the central axis of a bottom bracket of the bicycle frame perpendicular to the plane at a predetermined position on the plane, and is suitable to be fixed along the central axis of the bottom bracket. Rotate the angular position to fix the riser or down tube at a predetermined position.

In an embodiment of the present invention, the above-mentioned fixing device is adapted to fix the stand pipe and the down pipe at two predetermined positions on the plane respectively, and make the central axis of the stand pipe and the central axis of the down pipe parallel to the plane.

In an embodiment of the present invention, the above-mentioned fixing device is adapted to support two of the upper tube, the lower tube, and the riser on a plane, and make the central axis of the two of the upper tube, the lower tube and the riser parallel于面。 In the plane.

In an embodiment of the present invention, the above-mentioned bicycle frame detection system further includes a detection unit, wherein the detection unit is adapted to detect the position of the central axis of a five-way tube of the bicycle frame and any characteristic point on the plane.

Based on the above, the present invention uses the image capturing device to capture the image of the characteristic point of the bicycle frame at a specific position according to the design parameters of the bicycle frame, and calculates the actual coordinates of the characteristic point according to the position of the characteristic point in the image. In this way, the size value and angle value of the bicycle frame can be calculated from the actual coordinates of the multiple feature points of the bicycle frame, and the offset of the size and angle of the bicycle frame can be detected accurately and quickly.

Fig. 1 is a schematic diagram of a bicycle frame detection system according to an embodiment of the present invention. FIG. 2 shows a bicycle frame used for detection by the bicycle frame detection system of FIG. 1. Please refer to FIG. 1. The bicycle rack inspection system 100 of this embodiment includes a fixing device 110, at least one image capturing device 120, and a computing unit 130. In FIG. 1, only one image capturing device 120 is schematically shown. The actual number can be more than one. The fixing device 110 is suitable for fixing the bicycle frame 50 shown in FIG. 2, the image capturing device 120 is suitable for capturing images of the bicycle frame 50 fixed to the fixing device 110, and the computing unit 130 is, for example, a computer or other appropriate computing device. It is suitable for calculating the size and angle of the frame 50 according to the image captured by the image capturing device 120.

Fig. 3 is a flowchart of a bicycle frame detection method corresponding to the bicycle frame detection system of Fig. 1. Please refer to FIGS. 1 to 3, specifically, the bicycle frame 50 can be fixed on a plane P by the fixing device 110 first, wherein the central axis A4 of a riser 58 of the bicycle frame 50 and the lower tube 54 of the bicycle frame 50 The central axis A3 or the central axis A2 of an upper tube 52 defines the plane P (step S1). The plane P can also be defined by an upper tube 52 and a lower tube 54. In essence, the riser 58, an upper pipe 52 and a lower pipe 54 should be on the same plane. The position of the bicycle frame 50 on the plane P is obtained (step S2). According to the design parameters of the bicycle frame 50, move at least one image capturing device 120 simultaneously or sequentially to a plurality of characteristic points corresponding to the bicycle frame 50 on the plane P (the characteristic points 50a1~50a4, 50b1, 50b2, 50c1, 50c2, 50d, 50f) (step S3).

Then, the corresponding feature points 50a1-50a4, 50b1, 50b2, 50c1, 50c2, 50d, 50f are captured at each feature point 50a1-50a4, 50b1, 50b2, 50c1, 50c2, 50d, 50f by the image capturing device 120 Video (step S4). According to the position of each feature point 50a1~50a4, 50b1, 50b2, 50c1, 50c2, 50d, 50f in the image, the calculation unit 130 calculates each feature point 50a1~50a4, 50b1, 50b2, 50c1, 50c2, 50d, 50f A mark corresponding to the corresponding image capturing device 120 (step S5). According to the image capturing position of each image capturing device 120 and the coordinates of each feature point 50a1-50a4, 50b1, 50b2, 50c1, 50c2, 50d, 50f relative to the corresponding image capturing device 120, the calculation unit 130 calculates each An actual coordinate of the feature points 50a1-50a4, 50b1, 50b2, 50c1, 50c2, 50d, and 50f on the plane P (S6). The size value or angle value of the bicycle frame 50 is calculated according to the actual coordinates of the characteristic points 50a1-50a4, 50b1, 50b2, 50c1, 50c2, 50d, and 50f (step S7).

As described above, the present embodiment uses the image capturing device 120 to capture images of the characteristic points 50a1-50a4, 50b1, 50b2, 50c1, 50c2, 50d, 50f of the bicycle rack 50 at specific positions according to the design parameters of the bicycle rack 50. The actual coordinates of the feature points are calculated based on the positions of the feature points 50a1-50a4, 50b1, 50b2, 50c1, 50c2, 50d, and 50f in the image. In this way, the actual coordinates of the multiple feature points 50a1~50a4, 50b1, 50b2, 50c1, 50c2, 50d, and 50f of the bicycle frame 50 can be used to calculate the size or angle value of the bicycle frame 50, so as to accurately detect the bicycle The size and angular offset of the frame 50.

In the above step S7, the calculation unit 130 calculates the actual coordinates of each feature point 50a1-50a4, 50b1, 50b2, 50c1, 50c2, 50d, and 50f according to the design parameters of the bicycle frame 50. After the coordinates of the above-mentioned feature points are obtained, the centerline equations of each axis and the coordinates of the intersections of the centerlines can be calculated, and thus the critical distance and included angle that need to be detected can be calculated.

In the above steps S1 and S2, the fixing device 110 can fix the central axis of the bottom bracket 56 of the bicycle frame 50 perpendicular to the plane P at a predetermined position p1 on the plane P, and then along the central axis of the bottom bracket 56 A certain rotation angle position is used to fix the seat tube 58 or the down tube 54 of the bicycle frame 50 at the predetermined position shown in FIG. 1. Here, for example, the vertical tube 58 or the down tube 54 of the bicycle frame 50 is fixed by the fixing member 112 or the fixing member 114 shown in FIG. 2, but the present invention is not limited thereto. In this fixing method, a specific part of the bicycle frame 50 is fixed by the fixing device 110. The predetermined position p1 is the position of the central axis of the bottom bracket 56 and can be used as a reference coordinate point, which means that the above steps are completed. In S2, the position of the bicycle frame 50 on the plane P is obtained. After fixing the bicycle frame 50, the coordinate position of each characteristic point can be calculated according to the design parameters of the bicycle frame 50, and then the image capturing device 120 is moved to each corresponding position to capture the image of each characteristic point.

Alternatively, in the above steps S1 and S2, the fixing device 110 can be changed to fix the riser 58 and the down tube 54 at two predetermined positions p2, p3 on the plane P by the fixing members 112, 114 respectively, and make the riser The central axis A4 of 58 and the central axis A3 of the down tube 54 are parallel to the plane P. The fixing device 110 fixes a specific part of the bicycle frame 50 as described above. Based on the preset angles and positions of the fixing members 112 and 114, the position of the central axis of the bottom bracket 56 of the fixed frame 50 can be determined, and The central axis of the bottom bracket 56 can be used as the reference coordinate point, that is, the position of the bicycle frame 50 on the plane P is obtained after the above step S2 is completed.

Or, in the above step S1, the fixing device 110 may support two of the upper tube 52, the lower tube 54 and the riser 58 on the plane P, and make the upper tube 52, the lower tube 54 and the riser 58 The center axis of two of them is parallel to the plane P. Then, in the above step S2, a detection unit (such as one of the image capturing devices 120) is used to capture two specific parts of the bicycle frame 50 (for example, detecting that the central axis of the bottom bracket 56 is in the plane The position on P and the front edge position 50f visible along the z-axis of the central axis A4 of the top of the riser 58), that is, specific parts (such as the central axis of the bottom bracket 56 and the central point 50f of the top of the riser 58) can be used as references The coordinate point is to obtain the position of the bicycle frame 50 on the plane P after completing the above step S2.

The above step S3 will be further described below. In the above step S3, the design parameters of the bicycle frame 50 are, for example, the computer-aided design (CAD) frame 50 related parameters used to design the frame 50 or the design parameters of other suitable forms of the frame 50 design drawings. The present invention There is no restriction on this. According to the design parameters, the area where the characteristic points 50a1~50a4, 50b1, 50b2, 50c1, 50c2, 50d, and 50f of the bicycle frame 50 are located can be determined, and the image capturing device 120 can be arranged accordingly to move to the corresponding Location.

The above steps S4 to S6 will be further described below. FIG. 4 is a schematic diagram of an image captured by the image capturing device of FIG. 1. As shown in FIG. 4, taking the feature point 50c1 as an example, the image captured by the image capturing device 120 in the above step S4 does not coincide with the center point C of the image, which indicates that the feature point 50c1 deviates from the design value. In the above step S5, the coordinates of the feature point 50c1 relative to the image capturing device 120 can be calculated according to the relative position of the feature point 50c1 and the center point C in the image. Here, for example, it is based on the number of pixels corresponding to the distance between the feature point 50c1 in the image and the center point C in the x-axis and the y-axis, and the distance between the image capturing device 120 and the plane P in the z-axis , To calculate the coordinates of the feature point 50c1 relative to the image capturing device 120. According to the image resolution of the image capturing device 120, the relative coordinate (distance) can be calculated by calculating and correcting the pixel error value in the image. After the relative coordinates of the feature point 50c1 and the image capturing device 120 are calculated, the actual coordinates of the feature point 50c1 on the plane P can be further calculated as in step S6. The method of calculating the actual coordinates of the feature points 50c2, 50d, and 50f on the plane P is similar to the above method, and will not be repeated here.

FIG. 5 is a schematic diagram of another image captured by the image capturing device of FIG. 1. Taking the feature points 50b1 and 50b2 shown in FIG. 5 as an example, in the image captured by the image capturing device 120 in the above step S4, two edges 54a, 54a, 54b sandwiches a straight line VL with a specific angle (here, for example, 90 degrees), and the intersection of this straight line VL and the two edges 54a, 54b is defined as the location of the feature points 50b1 and 50b2. In the above step S5, the relative positions of the feature points 50b1, 50b2 and the midpoint C'relative to the image captured can be calculated based on the relative positions of the midpoint C'and the center point C of the connection between the feature points 50b1 and 50b2 in the image. Take the coordinates of the device 120. Here, for example, it is based on the number of pixels corresponding to the distance between the center point C'and the center point C in the x-axis and the y-axis in the image, and the relationship between the image capturing device 120 and the plane P in the z-axis The distance is used to calculate the coordinates of the feature points 50b1, 50b2 and the midpoint C′ relative to the image capturing device 120. After calculating the relative coordinates of the feature points 50b1, 50b2 and the midpoint C'and the image capturing device 120, the actual coordinates of the feature points 50b1, 50b2 and the midpoint C'on the plane P can be further calculated as in the above step S6 . The method of calculating the actual coordinates of the characteristic points 50a1, 50a2 and the midpoints of their connecting lines and the characteristic points 50a3, 50a4 and their connecting midpoints on the plane P is similar to the above method, and will not be repeated here.

The above step S7 will be further described below. After the actual coordinates of the feature points 50a1-50a4, 50b1, 50b2, 50c1, 50c2, 50d, and 50f are calculated, the actual geometric shape, size, and angle of the bicycle frame 50 can be further calculated. For example, on the plane P shown in FIG. 1, a straight line passing through the midpoint of the connecting line between the two characteristic points 50a1 and 50a2 and passing through the midpoint of the connecting line between the two characteristic points 50a3 and 50a4 is the central axis A2 of the upper tube 52 . Because the central axis A2 is located on the plane P, the z-axis coordinates are fixed. As long as the xy coordinate values of two points on the central axis A2 are detected, the equation of the central axis A2 can be calculated. A straight line on the plane P shown in FIG. The straight line passing through the characteristic point 50f and the predetermined position p1 on the plane P shown in FIG. 1 is the central axis A4 of the riser 58. The line passing through the two characteristic points 50c1 and 50c2 on the plane P shown in Fig. 1 is the central axis A1 of the head tube 59, where 50c1 and 50c2 are the central points of the inner circular holes at the upper and lower ends of the head tube 59. It can be on the xy plane. The position of the front end as seen along the z-axis. Because the z coordinate of the central axis A1 is fixed, the linear equation of the central axis A1 can be obtained from the xy coordinates of the two points 50c1 and 50c2.

As shown in FIG. 2, at a specific position on the central axis A1 of the head pipe 59, the center 50 e of the front wheel can be obtained by vertical translation in front of the bicycle frame 50. The characteristic point 50d is the center of the rear wheel connecting portion 57a of the chain stay 57 of the bicycle frame 50, that is, the center of the rear wheel. With reference to the design parameters of the bicycle frame, the equation and length of the line connecting the center 50e of the front wheel and the center of the rear wheel (feature point 50d) on the same z-coordinate on the xy plane (plane P) can be inferred. The vertical distance H from the center point p1 of the bottom bracket can also be calculated. The distance FC between the center 50e of the front wheel and the center axis of the bottom bracket 56 on the x-axis can also be calculated. In addition, the center line A2 of the upper tube 52 intersects the center line A4 of the riser tube 58 and the center line A1 of the head tube 59 at the intersection point p4 and the intersection point p5, respectively. According to the coordinates of the intersection point p4 and the intersection point p5, the distance O between the two points can be calculated. Furthermore, the angle IA1 between the head tube 59 and the upper tube 52 can be inferred from the central axis A1 of the head tube 59 and the central axis A2 of the upper tube, and the vertical axis can be inferred from the central axis A4 of the riser 58 and the central axis A3 of the down tube 54 The angle between the tube 58 and the down tube 54 is IA2. And so on, the upper tube 52, the lower tube 54, and the upper fork 55 of the bicycle frame 50 calculated based on the actual coordinates of the characteristic points 50a1~50a4, 50b1, 50b2, 50c1, 50c2, 50d, 50f, and/or more. The linear equations of the central axis of the chainstay 57, the stand pipe 58, and the head pipe 59 can further calculate the actual size and relative angle of each component of the bicycle frame 50.

If the position of the feature point is not easy to accurately determine in the image captured by the image capturing device 120 due to the design of the bicycle frame, the mark on the additional auxiliary device can be used to assist the determination. Fig. 6 is a partial enlarged view of the bicycle frame of Fig. 1 at the upper end of the head tube. For example, as shown in FIG. 6, the upper end of the head tube 59 can be sleeved on a rod 60, and the characteristic point at the midpoint of the end edge of the head tube 59 can be determined by the auxiliary mark line M pre-marked on the rod 60 The location of 50c. In the case where the end edge of the head tube 59 is easy to recognize visually (the head tube 59 shown in FIGS. 2 and 6), the position of the midpoint of the end edge of the head tube 59 may not be judged by the above-mentioned auxiliary mark line M. Instead, the midpoint of the connection line is directly inferred from the two edges E1 and E2 (marked in FIG. 6) at the end of the head tube 59. In the case where the end edge of the head pipe 59 is difficult to recognize visually, the above-mentioned auxiliary mark line M helps to determine the position of the midpoint of the end edge of the head pipe 59. Fig. 7 is another partial enlarged view of the bicycle frame of Fig. 1 at the upper end of the head tube. If the measurement position needs to be as close as possible to the central axis A1 of the head tube 59, the upper end of the head tube 59 can be sleeved on a rod 60' as shown in FIG. There is a thin tube coaxial with the central axis A1 of the head tube 59. An auxiliary marking line M'can be provided on the thin tube to accurately determine a measurement position 50c3 of the upper end of the central axis A1 of the head tube 59.

In summary, according to the design parameters of the bicycle frame, the present invention moves the image capturing device to a preset specific position to capture the image of the characteristic point of the bicycle frame, and calculates the characteristic point according to the position of the characteristic point in the image The actual coordinates. In this way, the size value and angle value of the bicycle frame can be calculated from the actual coordinates of the multiple characteristic points of the bicycle frame, and the size and angle of the bicycle frame can be detected accurately and quickly.

50: bike rack 50a1~50a4, 50b1, 50b2, 50c1, 50c2, 50d, 50f: feature points 50c3: Measuring position 52: upper tube 54: down tube 54a, 54b: edge 55: Fork 56: Five-way tube 57: Fork 57a: Rear wheel connection 58: riser 59: head tube 60, 60’: Rod 100: Bicycle frame detection system 110: Fixing device 112, 114: fixed parts 120: Image capture device 130: calculation unit A1~A4: Central axis C: center point C’: midpoint FC, H, O: distance IA1, IA2: included angle M, M’: Auxiliary marking line P: plane p1, p2, p3: predetermined position p4, p5: intersection point S1~S6: steps VL: straight line

Fig. 1 is a schematic diagram of a bicycle frame detection system according to an embodiment of the present invention. FIG. 2 shows a bicycle frame used for detection by the bicycle frame detection system of FIG. 1. Fig. 3 is a flowchart of a bicycle frame detection method corresponding to the bicycle frame detection system of Fig. 1. FIG. 4 is a schematic diagram of an image captured by the image capturing device of FIG. 1. FIG. 5 is a schematic diagram of another image captured by the image capturing device of FIG. 1. Fig. 6 is a partial enlarged view of the bicycle frame of Fig. 1 at the head tube. Fig. 7 is another partial enlarged view of the bicycle frame of Fig. 1 at the upper end of the head tube.

S1~S7: steps

Claims (10)

A method for detecting bicycle frames includes: Fixing a bicycle frame on a plane, wherein the central axis of a riser of the bicycle frame and the central axis of a lower tube or an upper tube of the bicycle frame define the plane; Obtain the position of the bicycle rack on the plane; According to the design parameters of the bicycle frame, move at least one image capturing device to positions corresponding to a plurality of characteristic points of the bicycle frame on the plane simultaneously or sequentially; Capturing an image of the corresponding feature point at each of the feature points by the at least one image capturing device; According to the position of each feature point in the image, calculate a mark of each feature point relative to the corresponding at least one image capturing device; Calculating an actual coordinate of each feature point on the plane according to the image capturing position of the at least one image capturing device and the coordinates of each feature point relative to the corresponding at least one image capturing device; and At least one size value or at least one angle value of the bicycle frame is calculated according to the actual coordinates of each characteristic point. The method for detecting a bicycle frame according to claim 1, wherein the steps of fixing the bicycle frame on the plane and obtaining the position of the bicycle frame on the plane include: Fixing the central axis of a bottom bracket of the bicycle frame at a predetermined position on the plane to be perpendicular to the plane; and A certain rotational angle position along the central axis of the five-way pipe is used to fix the vertical pipe or the down pipe at a predetermined position. The method for detecting a bicycle frame according to claim 1, wherein the steps of fixing the bicycle frame on the plane and obtaining the position of the bicycle frame on the plane include: The stand pipe and the down pipe are respectively fixed at two predetermined positions on the plane, and the central axis of the stand pipe and the central axis of the down pipe are parallel to the plane. The method for detecting a bicycle frame according to claim 1, wherein the step of fixing the bicycle frame on the plane includes: Two of the upper tube, the lower tube and the riser are supported on the plane, and the central axis of the two of the upper tube, the lower tube and the riser is parallel to the plane. The method for detecting a bicycle frame according to claim 4, wherein the step of obtaining the position of the bicycle frame on the plane includes: The central axis of a five-way tube of the bicycle frame and the position of any characteristic point on the plane are detected. A detection system for bicycle racks includes: A fixing device suitable for fixing a bicycle frame on a plane, wherein the central axis of a vertical tube of the bicycle frame and the central axis of a lower tube or an upper tube of the bicycle frame define the plane; At least one image capturing device is adapted to move to positions corresponding to a plurality of characteristic points of the bicycle frame on the plane simultaneously or sequentially according to the design parameters of the bicycle frame, wherein the at least one image capturing device is adapted to An image of the corresponding feature point is captured at each feature point, wherein the specific part of the bicycle frame is fixed by the fixing device or the specific part of the bicycle frame is captured by the at least one image capturing device to obtain the The position of the bicycle rack on the plane; and A calculation unit is adapted to calculate a landmark of each feature point relative to the at least one image capturing device corresponding to the position of each feature point in the image, and is adapted to calculate a landmark according to the at least one image capturing device. The image position and the coordinates of each feature point relative to the corresponding at least one image capturing device calculates an actual coordinate of each feature point on the plane, and is suitable for calculation based on the actual coordinate of each feature point At least one size value or at least one angle value of the bicycle frame. The bicycle frame detection system according to claim 6, wherein the fixing device is adapted to fix the central axis of a bottom bracket of the bicycle frame perpendicular to the plane at a predetermined position on the plane, and is suitable for The central axis of the five-way pipe has a certain rotational angle position to fix the stand pipe or the down pipe at a predetermined position. The bicycle frame detection system according to claim 6, wherein the fixing device is adapted to fix the vertical tube and the down tube at two predetermined positions on the plane, respectively, and make the center axis of the vertical tube and the center of the down tube The axis is parallel to the plane. According to the bicycle frame detection system according to claim 6, the fixing device is adapted to support two of the upper tube, the lower tube and the riser on the plane, and make the upper tube, the lower tube and the The central axis of the two of the risers is parallel to the plane. The bicycle frame detection system according to claim 9, further comprising a detection unit, wherein the detection unit is adapted to detect the central axis of a bottom bracket of the bicycle frame and the position of any one of the characteristic points on the plane.

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