Imaging method and camera mounting jig

Abstract

This imaging method comprises a step for fixing a camera mounting jig that supports a camera to a fitting provided on a boat rowed by a rower and through which an oar used for rowing is inserted, and capturing an image of the rower and the oar with the camera supported by the camera mounting jig fixed to the fitting.

Description

Shooting method and camera mounting jig

[0001] The present disclosure relates to a photography method and a camera mounting jig.

[0002] Generally, for example, in training for rowing boats (boat racing), the force exerted on an oar (rowing power), timing, etc. are measured and recorded. As a method used for such measurements, Non-Patent Document 1 discloses a system that uses pressure sensors to measure, analyze, and evaluate the force exerted on the soles of a rower's feet as rowing power.

[0003] Kuwano Shipbuilding Co., Ltd., "Development of a Practical Advanced Sensing and Data Analysis System for Racing Boats," [online], 2014, Shiga Prefecture Federation of Small and Medium Enterprise Associations, [Retrieved September 2, 2024], Internet <URL: https: / / chuokai-shiga.or.jp / wp-content / uploads / 2021 / 06 / fc211069a9ece6879317717870e4c427.pdf>

[0004] However, there is a problem in that it is difficult to grasp the detailed and objective movements of the rower and oars while on board. For example, because the above system uses a pressure sensor to measure rowing force, it is not possible to record the detailed conditions of the rower or oars, and it is not possible to obtain data for objectively evaluating the rower's skills.

[0005] The problem to be solved by the present disclosure is to provide a photographing method and a camera mounting jig that can record the detailed state of the rower and oars while on a boat.

[0006] The photographing method according to the present disclosure includes the steps of fixing a mounting jig that supports a camera to a metal fitting that is provided on a boat that a rower uses to row and through which an oar used on the boat is inserted, and photographing the rower and the oar with a camera that is supported by the mounting jig that is fixed to the metal fitting.

[0007] The mounting jig according to the present disclosure is configured to include a fixing portion that is fixed to a metal fitting that is provided on a boat used by a rower and through which an oar used on the rowing boat is inserted, and a support portion that supports a camera that photographs the rower and the oar.

[0008] FIG. 1 is an explanatory diagram showing an outline of a rowing boat according to an embodiment of the present disclosure; FIG. 2 is an explanatory diagram showing a configuration around a metal fitting according to an embodiment of the present disclosure; FIG. 3 is an explanatory diagram showing an attachment jig according to an embodiment of the present disclosure, where (a) is a front view of the attachment jig, (b) is a side view of the attachment jig, and (c) is another side view of the attachment jig; FIG. 4 is an explanatory diagram showing an example of an image captured by a camera unit according to an embodiment of the present disclosure; FIG. 5 is an explanatory diagram showing the range that can be captured by a camera unit according to an embodiment of the present disclosure, where (a) is a diagram showing a state in which a rower has pushed an oar forward, (b) is a diagram showing a state in which the rower has pointed the oar straight to the side, and (c) is a diagram showing a state in which the rower has pulled the oar backward.

[0009] Hereinafter, an embodiment of the present disclosure will be described with reference to the accompanying drawings. The embodiment described below is an example and is not to be construed as being limited by this description.

[0010] 1 shows a schematic diagram of a rowing boat according to one embodiment of the present disclosure. The rowing boat includes a rower 1, a boat 2, oars 3, and hardware 4 connected to the boat 2.

[0011] The rower 1 may refer to, for example, a boat racer, but is not limited to this. The rower 1 operates oars 3 to row the boat 2. The boat 2 may refer to, for example, a boat used in a rowing competition, but is not limited to this. The oars 3 are tools that the rower 1 uses on the boat 2 to generate rowing power by paddling through the water. The metal fittings 4 are called rowlocks and have insertion holes in the center through which the oars 3 are inserted. The metal fittings 4 are connected to the boat 2, and when the oars 3 operated by the rower 1 are inserted into the insertion holes, the movement of the oars 3 is transmitted as propulsive force for the boat.

[0012] Next, the configuration around the metal fitting 4 according to one embodiment of the present disclosure will be described with reference to Fig. 2. As shown in Fig. 2, the metal fitting 4 is connected to the boat 2 by a connecting member 5, and a camera unit 7 is attached to the metal fitting 4 by an attachment jig 6.

[0013] The connecting member 5 is a rod-shaped member that is inserted into and fixed to the boat 2, and by inserting it into one end of the metal fitting 4, it connects the metal fitting 4 to the boat 2 so that it can rotate around the connecting member 5 as a rotation axis. The mounting jig 6 has a fixing part that is fixed to the metal fitting 4, and is detachably provided on the upper part of the metal fitting 4. The mounting jig 6 also has a support part 8 on its upper part that supports the camera unit 7. The structure of the mounting jig 6 will be described in detail later. Note that the mounting location of the mounting jig 6 does not necessarily have to be the upper part of the metal fitting 4, and the mounting jig 6 may be provided on the side or below the metal fitting 4.

[0014] The camera unit 7 is attached to the fitting 4 via the mounting jig 6. The camera unit 7 is detachably attached to the top of the mounting jig 6 and photographs the rowing boat. The camera unit 7 includes two cameras: one camera that photographs the area in front of the rower 1 in the insertion direction of the oar 3 passing through the insertion hole of the fitting 4, and another camera that photographs the area behind the rower 1 in the same insertion direction. The camera unit 7 may also include, for example, a 360-degree camera or three or more cameras to photograph the rowing boat over a wide range.

[0015] Next, the structure of the mounting jig 6 according to one embodiment of the present disclosure will be described with reference to Fig. 3. Fig. 3(a) shows a front view of the mounting jig 6, Fig. 3(b) shows a side view of one side of the mounting jig 6, and Fig. 3(c) shows a side view of the other side of the mounting jig 6.

[0016] The mounting jig 6 is formed by connecting two L-shaped members 21, 25 that are L-shaped when viewed from the front so that they can move relative to each other, with a support portion 8 that supports the camera unit 7 provided on the upper surface of the L-shaped member 21 and fixing portions 6a, 6b for fixing the mounting jig 6 to the metal fittings 4 provided on the lower portions of the L-shaped members 21, 25. Because the L-shaped members 21, 25 are movable relative to each other, it is possible to adjust the distance between the fixing portion 6a at the lower portion of the L-shaped member 21 and the fixing portion 6b at the lower portion of the L-shaped member 25 as needed, thereby changing the mounting width of the mounting jig 6. Note that although the mounting jig 6 has been described as being formed by connecting the L-shaped members 21, 25 so that they can be moved, the mounting jig 6 may also be formed by integrating the L-shaped members 21, 25.

[0017] The lower part of the L-shaped member 21 is a thin plate-like portion that is thinner than the upper part, and a pin screw 24 is fixed to this thin plate-like portion. The pin screw 24 is inserted through a movable plate 22 that faces the thin plate-like portion, and the metal fitting 4 is sandwiched between the thin plate-like portion of the L-shaped member 21 and the movable plate 22. A nut 23 is attached to the pin screw 24 at a position farther away from the thin plate-like portion than the movable plate 22, and the distance between the thin plate-like portion and the movable plate 22 that abuts against the nut 23 can be adjusted by tightening or loosening the nut 23 on the pin screw 24. This allows the distance between the thin plate-like portion and the movable plate 22 to be adjusted according to the thickness of the metal fitting 4, and the metal fitting 4 can be securely sandwiched to fix the mounting jig 6.

[0018] A fixed portion 6b that is fixed to the metal fittings 4 is provided below the L-shaped member 25, and the fixed portion 6b has a pair of clamping plates 26 that clamp the metal fittings 4, a pair of inclined plates 27 that extend obliquely from the clamping plates 26, and a spring 28 that elastically connects the pair of clamping plates 26 and the inclined plates 27.

[0019] The fixing portion 6b is fixed to the lower end of the L-shaped member 25 via a spring 28, and a pair of clamping plates 26 and inclined plates 27 are arranged to face each other. Because the pair of inclined plates 27 are inclined away from each other, when a force is applied in a direction that moves the inclined plates 27 toward each other, the opposing clamping plates 26 move apart as the inclined plates 27 move toward each other. In this state, when the mounting jig 6 is moved to a position where the opposing clamping plates 26 clamp the metal fitting 4, and the force applied to the inclined plates 27 is removed, the metal fitting 4 is clamped between the clamping plates 26 by the elastic force of the spring 28. In this way, the distance between the pair of clamping plates 26 can be adjusted according to the thickness of the metal fitting 4, and the metal fitting 4 can be securely clamped to fix the mounting jig 6. Note that although the pair of clamping plates 26 and inclined plates 27 are elastically connected by the spring 28, this is not limited thereto; any configuration that can clamp the metal fitting 4 is sufficient.

[0020] In this way, the mounting jig 6 is formed by combining L-shaped members 21, 25 having fixing portions 6a, 6b for fixing to the metal fitting 4, and the mounting jig 6 can be attached and detached to the metal fitting 4, and can also be fixed to the metal fitting 4. The mounting jig 6 also has a support portion 8 that supports the camera unit 7. Therefore, the camera unit 7 that captures images of the rowing boat can be attached to the metal fitting 4 via the mounting jig 6. As a result, the camera unit 7 rotates in conjunction with the rotation of the metal fitting 4 around the connecting member 5 as the rotation axis, making it possible to maintain a constant positional relationship between the camera's shooting direction and the rower 1 and oars 3.

[0021] Figure 4 shows an example of a rowing boat photographed by the camera unit 7. That is, Figure 4 shows an example of an image photographed by the camera unit 7, which is equipped with two cameras: one for photographing the front side of the oar 3 as it passes through the insertion hole of the metal fitting 4, and the other for photographing the rear side of the oar 3 as it passes through the insertion hole. As shown in Figure 4, the camera unit 7 attached to the metal fitting 4 by the mounting jig 6 can simultaneously photograph an image of the rower 1 manipulating the oar 3 (the image on the right in Figure 4) and an image of the oar 3 paddling through the water (the image on the left in Figure 4). This makes it possible to record the detailed status of the rower 1 and oar 3 while on the boat.

[0022] 5A and 5B are diagrams showing specific examples of the angles of view that can be captured by the camera unit 7 attached to the metal fitting 4. As shown in FIG. 5A, when the rower 1 pushes the oar 3 forward, the tip of the oar 3 facing the water surface is located behind the rower 1. In this embodiment, the camera unit 7 is attached to the metal fitting 4, which changes direction in accordance with the movement of the oar 3. Therefore, the angle of view 31a of the camera capturing images of the water surface faces behind the rower 1, and the angle of view 31b of the camera capturing images of the rower 1 faces toward the rower 1 who has moved forward. Therefore, it is possible to simultaneously capture the entire body of the rower 1 and the tip of the oar 3.

[0023] As shown in Figure 5(b), when the rower 1 points the oars 3 straight to the side, the tips of the oars 3 facing the water surface are located directly to the side of the rower 1. In this state, the angle of view 31a of the camera photographing the water surface side faces directly to the side of the rower 1, and the angle of view 31b of the camera photographing the rower 1 side faces toward the rower 1. Therefore, it is possible to photograph the entire body of the rower 1 and the tips of the oars 3 at the same time.

[0024] 5(c), when the rower 1 pulls the oar 3 backward, the tip of the oar 3 facing the water surface is located in front of the rower 1. At this time, the angle of view 31a of the camera photographing the water surface side faces forward of the rower 1, and the angle of view 31b of the camera photographing the rower 1 side faces toward the rower 1 who has moved backward. Therefore, it is possible to photograph the entire body of the rower 1 and the tip of the oar 3 at the same time.

[0025] In this way, even if the positions of the rower 1 and oars 3 change, the rower 1 and oars 3 always remain within the camera's angles of view 31a, 31b because the camera unit 7 is attached to the bracket 4, which changes direction in accordance with the movement of the oars 3. This makes it possible to record the detailed status of the rower 1 and oars 3 while rowing. Furthermore, by adjusting the shooting direction so that the oars 3 extend to the center of the angle of view 31a, the positional relationship between the shooting direction and the tips of the oars 3 is maintained, and images can be taken in which the oars 3 are always positioned in the center, even if the oars 3 move during rowing.

[0026] Furthermore, when the oars 3 are not paddling, i.e., when the oars 3 are not submerged, they do not encounter resistance from the water and therefore remain straight and do not deform. On the other hand, when the oars 3 are paddling, i.e., when the oars 3 are submerged, they encounter resistance from the water and bend. The degree of bending of the oars 3 reflects the water resistance according to the magnitude of the rowing force, so it is possible to determine the magnitude of the rowing force from the degree of bending of the oars 3 in the photographed image.

[0027] Furthermore, the images captured by the camera unit 7 can be transmitted, for example, wirelessly to a land-based system (not shown). In this case, a predetermined program can be executed in the system (not shown) to record or analyze the images captured by the camera unit 7, or display the images captured by the camera unit 7 on a remote monitor.

[0028] As described above, the photographing method according to this embodiment includes the steps of attaching the mounting jig 6 that supports the camera unit 7 to the metal fitting 4 and photographing the rowing boat with the camera unit 7. This makes it possible to record the detailed state of the rowers and oars while they are aboard.

[0029] REFERENCE SIGNS LIST 1 Rower 2 Boat 3 Oar 4 Metal fitting 5 Connecting member 6 Mounting jig 6a Fixed part 6b Fixed part 7 Camera unit 8 Support part 21 L-shaped member 22 Movable plate 23 Nut 24 Rod screw 25 L-shaped member 26 Clamping plate 27 Diagonal plate 28 Spring 31a Viewing angle 31b Viewing angle

Claims

1. A photography method comprising the steps of: fixing a mounting jig for supporting a camera to a metal fitting that is provided on a boat for rowers and through which oars used in the rowing boat are inserted; and photographing the rowers and the oars with a camera supported by the mounting jig fixed to the metal fittings.

2. A mounting jig comprising: a fixing part that is fixed to a metal fitting that is provided on a boat for rowing and through which an oar used in the rowing boat is inserted; and a support part that supports a camera that photographs the rower and the oar.

Images