JP2010026235A - Camera angle controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily set a camera at the same angle each time for the analysis of walking movement. <P>SOLUTION: On the floor 8 in a studio 5, a reference marker 2 and a side marker 3 are formed in parallel with the center line 9a of the walk way 9, and the angle of the camera 7 on the tripod 6 is controlled by using a light projector 1 and a calibration aid 4. The calibration aid 4 is built by assembling the rods 43, 44, and 42 extending from the reference point 41 in the x, y and z directions, and has reflectors 51, 52, 53, and 54, respectively attached to the reference point 41, the free ends of the rods 42, 43, and the back linkage 47. Meanwhile, the light projector 1 on the camera 7 emits light 72 vertically flat in the manner of a laser marking device. When installing the camera 7 temporarily removed for some exercise etc. again for analyzing the walk movement, the calibration aid 4 is set by positioning the reflector 51 on the reference marker 2 and the reflector 53 on the side marker 3 so that the light 72 is radiated to the reflectors 51, 52, and 54. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an adjustment device for installing a portable (removable) camera so as to have the same imaging range (angle) every time, and particularly suitable for photographing a walking state in a studio or the like. Related.

In recent years, not only walking, but also how to walk, such as how to walk beautifully with good posture or how to enhance exercise effect, has been performed due to the heightened health consciousness. In the analysis, the movement of the subject is photographed with a camera. Such a typical prior art is for elderly people and rehabilitation patients. However, Patent Document 1 discloses that a post is attached at fixed positions on the left and right sides of the walking floor, and is passed between the front and rear posts. While the subject walks relying on the handrail, the camera captures the subject walking on the walking floor and analyzes the subject's footprint based on the illuminant embedded in the column by arithmetic processing. A footprint analyzer has been proposed.
JP 2002-342749 A

  In the above-described prior art, the handrail and the camera are permanently installed on the walking floor, and can be photographed at the same angle every time. In addition, a handrail post that the subject walks through is always reflected in the screen as a reference.

  However, since it is not possible to provide a reference such as a handrail when confirming how to walk with good posture as described above, it is possible to analyze the movement of the subject based on the relative positional relationship with the reference. The method cannot be used. Therefore, in the case where such a relative reference is not provided, if the camera is fixed, the analysis can be performed accurately each time only by the initial adjustment. That is, the distortion of the lens and the difference in the size of the subject image depending on the distance from the camera can be corrected in advance by image processing.

  However, in the studio or the like, the actual situation is that the camera has to be removed due to exercise. In addition, it is often difficult to rent a venue and diagnose the walking posture on a business trip, so it is difficult to install a camera permanently.

  An object of the present invention is to provide a camera angle adjusting device capable of easily installing a portable (removable) camera so as to have the same imaging range (angle) every time with good reproducibility.

  The camera angle adjusting device of the present invention is a device for installing a portable camera mounted on a tripod so as to have the same angle in a predetermined imaging space. A projector that emits light in a vertical plane including the optical axis of the image sensor, and a reference that is laid on the floor surface of the imaging space and is provided at a position where a projection line of the optical axis of the camera to the floor surface should pass A marker and a left / right marker provided on at least one of the left and right sides of the reference marker, and a plate-like body or a rod-like body extending in three directions orthogonal to each other from a reference point, and having a predetermined height from the floor surface In a state where the reference point is installed on the reference marker and the plate or bar extending in the left-right direction is installed so as to pass through the left-right marker, The projector Since the surface of the light is parallel to a plate-like body or rod-like body extending in the depth direction from the reference point, the optical axis of the camera passes over the reference marker, and the imaging surface of the camera is the reference surface. And a calibration jig that enables the camera to be installed on the tripod so as to be parallel to a line connecting the marker and the left and right markers.

  According to the above configuration, when a camera that is not fixedly installed and is mounted on a tripod and can be carried (removed) is installed at the same angle in a predetermined imaging space, the camera is placed on the floor surface of the imaging space. A marker is formed and a calibration jig is used for the projector. The projector is directly attached to a tripod head or mounted on a camera mounted on the head, and emits light in a vertical plane including the optical axis of the camera. As the marker, a reference marker is provided at a position where the projection line on the floor surface of the optical axis of the camera should pass, that is, a position to be the center of the screen, and left and right markers are provided on at least one of the left and right sides of the reference marker. And a reference line extending in the left-right direction is formed. On the other hand, the calibration jig is composed of a plate-like body or a rod-like body extending in the three directions x, y, z orthogonal to each other from a reference point, so that the plate-like body or the rod-like body standing from the floor surface is The reference point, i.e., the nodal point, is installed on the reference marker, and a plate or bar extending in the left-right direction is installed so as to pass through the left-right marker.

  Therefore, by installing a tripod so that the surface of the light from the projector is parallel to a plate or rod extending in the depth direction from the reference point at a position at a specified distance from the reference marker, Can be positioned in the pan direction so that its optical axis is perpendicular to the line connecting the reference marker and the left and right markers, and the tilt (optical axis). The camera can be installed by adjusting (rotating angle), that is, leveling in the left-right direction. Furthermore, positioning in the tilt direction can be performed by matching the upper end of the planar light from the projector with the upper end of the plate-like body or rod-like body extending upward from the reference point.

  Thus, a portable (removable) camera can be easily installed in the same imaging space so as to have the same imaging range (angle) each time with good reproducibility.

  Further, in the camera angle adjusting device of the present invention, the calibration jig is formed by combining rod-like bodies, and is a rod-like shape that stands at a predetermined height from the floor surface from the free end portion of the rod-like body extending in the left-right direction. The light projector may further emit light in a horizontal plane.

  According to said structure, the light of a horizontal direction passes through the free end part of the rod-shaped body which stands up from a reference | standard point, and the free end part of the rod-shaped body which stands up from the free end part of the rod-shaped body extended in the left-right direction. By adjusting the tripod, the angle adjustment in the tilt direction and the inclination (angle around the optical axis) can be adjusted more strictly.

  Furthermore, in the camera angle adjustment device of the present invention, the device to which the captured image from the camera is input includes a pixel whose number is a known size from the captured image of the predetermined portion of the calibration jig. Therefore, it has a means for calibrating the resolution of the captured image.

  According to the above configuration, a captured image from the camera, such as a walking motion analyzer, is input, and an apparatus that analyzes the captured image includes a captured image of a predetermined portion of the calibration jig as a result of test shooting. The resolution of the captured image (distance of the imaging space per pixel) from the number of pixels of the camera corresponding to the part whose size is known, for example, the width of the plate or the length of the rod Calibrate.

  Therefore, in addition to the angle adjustment as described above, calibration according to the distance can be performed, and the analysis accuracy in the apparatus can be improved. For example, in the case of the walking motion analysis device, it becomes possible to accurately detect the stride and the joint angle in correspondence with the resolution (with calibration).

  In the camera angle adjusting device of the present invention, the reference point and the corners of each plate-like body or the free end of the rod-like body further include a reflecting member that reflects light from the projector. To do.

  According to said structure, it can be determined easily whether the light from a light projector is shining. Further, the resolution of the distance per pixel as described above can be easily obtained from the distance between the reflecting members.

  Furthermore, in the camera angle adjustment device of the present invention, the reference marker and the left and right markers are formed on a long walking mat laid on the floor surface.

  According to the above configuration, the same imaging space can be taken in any place as long as the walking mat is brought to the camera, the projector, the tripod, and the calibration jig as well as a permanent studio for photographing the walking state. Can be configured. The marker may be formed on the walking mat in any form such as printing, painting, and sewing.

  Further, in the camera angle adjusting device of the present invention, the reference marker and the left and right markers are offset from the center line that serves as a standard for walking of the subject in the walking mat by a predetermined interval on the camera side. And

  According to the above configuration, when shooting the walking state, a marker is attached to the subject's leg, arm, etc., and it is captured by the camera. Therefore, the reference marker and the left and right markers are used for the walking of the subject on the walking mat. The camera angle can be adjusted at the actual marker passing position by forming an offset from the center line as a guide in front of the subject's body side.

  Furthermore, in the camera angle adjusting device of the present invention, the walking mat is further formed with a walking start mark that is extended or adapted to the stride.

  According to said structure, a test subject can be made to pass the optical axis vicinity of a camera by the optimal number of steps for analyzing a walk state irrespective of a test subject's expansion | extension and step length.

  As described above, the camera angle adjustment device of the present invention is not fixedly installed, and is mounted on a tripod and can be carried (removed), so that the camera can be mounted at a predetermined angle in a predetermined imaging space. On the floor surface of the imaging space, a reference marker is provided at a position where a projection line of the optical axis of the camera to the floor surface should pass, and further, left and right marker markers are formed on at least one of the left and right sides of the reference marker, The tripod is equipped with a projector that emits light in a vertical plane including the optical axis of the camera, and the vertical plane light from the projector is orthogonal to each other in x, y, and z directions. A calibration treatment comprising a plate-like body or rod-like body extending in three directions, the node of which is installed on the reference marker, and a plate-like body or rod-like body extending in the left-right direction is installed so as to pass through the left-right marker. By irradiating the adjusts the tripod.

  Therefore, a portable (removable) camera can be easily installed in the same imaging space so as to have the same imaging range (angle) every time with good reproducibility.

  In the camera angle adjusting device of the present invention, as described above, the calibration jig is configured by combining rod-shaped bodies, and further provided with a rod-shaped body that stands up from the free end of the rod-shaped body extending in the left-right direction. The projector is configured to emit light in a horizontal plane.

  Therefore, by adjusting the tripod so that the light in the horizontal direction passes between the ends of two rod-like bodies standing upright and spaced apart from each other and having the same length, tilting and tilting can be performed. Adjustment (angle around the optical axis) can be performed more strictly.

  Furthermore, as described above, the camera angle adjustment device of the present invention receives a captured image from the camera, such as a walking motion analysis device, and the device for analyzing the captured image has the calibration processing as a result of test shooting. The resolution (distance of the imaging space per pixel) of the captured image is calibrated from the captured image of a predetermined portion of the tool, from the number of pixels of the camera that corresponds to the known size.

  Therefore, in addition to the angle adjustment, calibration according to the distance can be performed, and the analysis accuracy in the apparatus can be improved.

  In addition, as described above, the camera angle adjusting device of the present invention reflects light from the projector on the nodal point of the plate-like body or rod-like body and the corners of each plate-like body or the free end portion of the rod-like body. A reflecting member is further provided.

  Therefore, it can be easily determined whether or not the light from the projector is hit.

  Furthermore, as described above, the camera angle adjusting device of the present invention forms the reference marker and the left and right markers on a long walking mat laid on the floor surface.

  Therefore, in order to photograph the walking state, not only a permanent studio etc., but also bring a walking mat to the camera, projector, tripod and calibration jig, the same imaging space can be configured at any place. Can do.

  Further, as described above, the camera angle adjusting device of the present invention is configured such that the reference marker and the left and right markers are offset on the camera side by a predetermined interval from the center line that is a guide for walking of the subject in the walking mat. To do.

  Therefore, the camera angle can be adjusted at the actual marker passing position.

  Furthermore, as described above, the camera angle adjusting device of the present invention further forms a walking start mark corresponding to an extension or stride on the walking mat.

  Therefore, regardless of the extension and the stride of the subject, the subject can be passed near the optical axis of the camera with the optimal number of steps for analyzing the walking state.

[Embodiment 1]
FIG. 1 is a perspective view showing a configuration of a camera angle adjusting apparatus according to the first embodiment of the present invention. The camera angle adjustment device according to the present embodiment includes a projector 1, a reference marker 2, a left / right marker 3, and a calibration jig 4. This camera angle adjusting device is used to install the camera 7 mounted on the tripod 6 so that the same imaging range (angle) 50 is obtained every time in the studio 5 as an imaging space. Then, a subject who walks on the walking path 9 shown on the floor surface 8 is photographed by the installed camera 7, and markers attached to the tips and joints of the subject's limbs are recognized and analyzed by an analysis means (not shown). By doing this, as will be described later, the determination of the stride, how to raise the leg, the swing width of the arm, etc. is performed at a time. This studio 5 is also used for exercise and the like, so the camera 7 is installed only during the analysis of the walking state, and is removed during the rest.

  The walking path 9 is selected as a predetermined region of the floor surface 8, and as shown in FIG. 2 (a), a center line 9a serving as a reference for walking of the subject is drawn at the center thereof. The reference marker 2 and the left and right markers 3 are placed offset from the center line 9a toward the camera 7 by a predetermined interval W. Therefore, a straight line 23 connecting the reference marker 2 and the left and right markers 3 is parallel to the center line 9a. Further, the reference marker 2 is provided on the reference marker 2 at a position where the projection line 71 of the optical axis of the camera 7 on the floor surface 8 should pass, that is, at a substantially intermediate position of the walking path 9. A calibration jig 4 is installed on the reference marker 2 and the left and right markers 3 when the imaging range (angle) 50 is adjusted, and the calibration jig 4 is removed during actual photographing.

  The calibration jig 4 is a plate or rod-like body (hereinafter referred to as a rod-like body in the present embodiment) 42, 43, extending in three directions x, y, and z orthogonal to each other from a reference point 41. 44 is configured in combination. The rod-like body 42 extending upward (z direction) from the reference point 41 stands from the floor surface 8 at a predetermined height, for example, a length of 1 m. The rod-like body 43 extending in the left-right direction (x direction) from the reference point 41 is also formed to a predetermined length, for example, 1 m. On the other hand, the rod-shaped body 44 extending in the depth direction (y direction) from the reference point 41 is formed to an arbitrary length. The rod-shaped body 44 may be formed on the front side (camera 7 side). Further, the rod-like body 43 may be formed to extend to the left of the reference point 41. The rod-like bodies 42, 43, 44 are held so as to be orthogonal to each other by appropriate connecting members 45, 46, 47 so as not to cause a deviation in angle. Reflecting members 51, 52, 53, and 54 are attached to the reference point 41, the free ends of the rod-like bodies 42 and 43, and the connecting member 47, respectively.

  The reflection members 51, 52, 53, and 54 are formed of spheres that reflect the light from the projector 1, the rod-shaped body 44 extends in the depth direction (on the side opposite to the camera 7), and the reflection member 54 is the rod-shaped body 42. In the case of being shaded, the rod-like body 42 may be made of a transparent material or two rod-like bodies parallel to each other, and a slit may be formed between them. Further, the reflecting member 54 may be provided on the rod-shaped body 44. These reflecting members 51, 52, 53, and 54 are diverted from markers attached to the subject and are drawn with emphasis in FIG. 1, but have a diameter of, for example, 14 mm.

  The projector 1 has a configuration similar to a so-called laser marking device, and after converging the diffused light from the semiconductor laser with a collimator lens, it is incident on a cylindrical rod lens and diffused only in the circumferential direction. 1 is configured to radiate a band-like light 72 as shown in FIG. 1 (in the example of FIG. 1, the diffusion is in the vertical direction and the rod lens is arranged in the horizontal direction). The projector 1 may be directly attached to a tripod head (not shown) or may be mounted on a camera 7 mounted on the platform as shown in FIG. Alternatively, if the camera 7 and the projector 1 and the pan / tilt head are provided with a one-touch detachable member, and the camera 7 and the projector 1 are exchanged with respect to the pan / tilt head, the same angle is set. The projector 1 may be a separate body.

  In the camera angle adjustment apparatus configured as described above, at the time of adjustment, first, the calibration jig 4 has its reflection member 51 (reference point 41) and reflection member 53 on the reference marker 2 and the left and right markers 3, respectively. Installed. Thereby, the rod-shaped body 43 extending in the left-right direction (x direction) is parallel to the straight line 23, that is, the center line 9a, and the rod-shaped body 44 extending in the depth direction (y direction) is coupled to the straight line 23, that is, the center line 9a. Orthogonal.

  On the other hand, a weight 62 is suspended from the head of the tripod 6 by a rope 61, and the weight 62 indicates the center position of the tripod 6. Subsequently, a tripod 6 is installed at a position where the weight 62 has a predetermined distance L from the reference marker 2 (reflecting member 51), for example, 5 m. 72 is emitted. First, the tilt adjustment is performed by adjusting the pan head so that the light 73 at the upper end of the band irradiates the reflecting member 52 attached to the tip of the rod-like body 42. It is assumed that the tripod 6 is adjusted in advance so that the length and the degree of opening of each leg 63 are equal.

  Further, the tilt of the camera platform (around the optical axis) is adjusted so that the reflecting member 51 of the reference point 41 is irradiated with any of the band-shaped lights 72, so that the band-shaped lights 72 are moved up and down. It can be adjusted in parallel with the rod-shaped body 42 extending in the direction (z direction).

  Thereafter, the left and right positions of the tripod 6 are adjusted so that the rear reflecting member 54 is irradiated with any one of the belt-like lights 72 at the position where the distance L is a predetermined length. The camera 7 can be installed so that the optical axis is orthogonal to the walking center line 9a. In addition, when the studio 5 is permanently installed and the place (imaging range) where shooting is performed in the walking state is determined, the center position of the tripod 6 corresponding to the weight 62 is shown together with the reference marker 2 and the left and right markers 3. A marker may be attached to the floor surface 8. The distance L also depends on the number of pixels of the captured image corresponding to the distance between the reflective member 51 and the reflective members 52 and 53, for example 1 m, in the captured image of the camera 7. Can be sought.

  With this configuration, a rod-like body in which the surface of the light 72 from the projector 1 extends in the depth direction from the reference marker 2 (reference point 41) at a position at a specified distance L from the reference marker 2 (reference point 41). 44 (reflection member 54) is installed so that the tripod 6 is parallel, so that the optical axis of the camera 7 passes over the reference marker 2 and the optical axis passes between the reference marker 2 and the left and right markers 3. The camera 7 can be installed by positioning in the pan direction so as to be perpendicular to the connecting line 23, that is, adjusting the tilt (angle around the optical axis), that is, leveling in the left-right direction. . Further, the light 73 at the upper end of the planar light 72 from the projector 1 is aligned with the upper end (reflecting member 52) of the rod-like body 42 extending upward from the reference point 41, thereby positioning in the tilt direction. Can do. Thus, the portable (removable) camera 7 can be easily installed in the same imaging space so that the same imaging range (angle) 50 can be obtained each time with good reproducibility.

  Further, by providing the reference member 41, the free ends of the rod-like bodies 42 and 43 and the rod-like body 47 with reflection members 51, 52, 53 and 54, respectively, whether or not the light 72 from the projector 1 is hit. It can be easily determined.

  On the other hand, FIG. 3 is a block diagram showing an electrical configuration of the walking motion analyzer 11. When photographing, a marker is attached to a point of interest such as a joint or end on one side (for example, the right side seen by the camera 7 when the subject walks from the left side to the right side in FIG. 1). It is done. The captured image of the camera 7 is input to the walking motion measuring unit 12, the marker is extracted, and various parameters such as the stride and the arm swing width are measured. The measurement result is input to the walking motion analysis unit 13, analyzed according to the intended purpose, and the analysis result is displayed on the display unit 14.

  For the walking motion measuring unit 12, for example, a two-dimensional motion capture as shown in FIG. FIG. 4B shows an example of the measurement result, which is the step length for each step. In the case of FIG. 4A, the difference between the X coordinate of the marker attached to the right leg outer fruit and the X coordinate of the marker attached to the left leg outer fruit after one step and the difference between the left leg and the right leg are It has been demanded. In addition to the step length, a step length, a step interval, or the like can be used as a length parameter obtained for each step, and a free leg time can be used as a time parameter. FIG. 5 (c) shows the joint angle of the upper arm for each step (θ1 in FIG. 5 (a)), which is obtained by the upper arm for two steps shown in FIG. 5 (b). The maximum value and the minimum value can be obtained from the variation of the angle θ1, and the difference can be obtained.

  Accordingly, the reference marker 2 and the left and right markers 3 are offset on the camera 7 side by a predetermined interval W from the center line 9a which is a guide for walking of the subject as shown in FIG. The angle of the camera 7 can be adjusted at the position where the marker 15 provided on the right side of the body actually passes (FIG. 2 (b) shows the footprint 16 of the subject walking on the walking path 9). The marker 15 is attached to the ankle). By the way, when taking a two-dimensional image, the lens is distorted in the depth, top, bottom, left and right directions. As described above, calibration is performed according to the position where the marker 15 to be analyzed actually passes. The error between the true value calculated from the captured image and the actual measurement value can be reduced.

  Further, in the walking movement measuring unit 12, as a result of the test shooting, a predetermined portion of the calibration jig 4, for example, a captured image of the reflecting members 51 and 53, is set to an interval (1 m) of which the size is known. On the other hand, the resolution of the distance per pixel is obtained in advance at the installation position depending on how many pixels of the camera 7 correspond, and in the actual measurement as described above, the resolution ( It is now possible to accurately detect stride length and joint angle. Specifically, when the distance between the imaging range (angle) 50 and the camera 7 is 5 m, the number of pixels recognized on the camera 7 with respect to the distance between the reflection members 51 and 53 of 1 m is, for example, Assuming 260 pixels, 100/260 = 0.3846 (cm / pixel). Not only the distance in the X direction but also the distance in the Y direction by the reflecting member 52 may be used.

  By comprising in this way, in addition to angle adjustment as mentioned above, the calibration according to distance can be performed, and the analysis precision in the walking movement analyzer 11 can be improved. Further, since the reflecting members 51 and 53 are markers attached to the subject, the walking motion measuring unit 12 is equipped with software for recognizing the markers, and the resolution can be easily calibrated. it can.

[Embodiment 2]
FIG. 6 is a perspective view showing a configuration of a camera angle adjusting apparatus according to the second embodiment of the present invention. The camera angle adjustment device according to the present embodiment includes a projector 1 ′, the reference marker 2, the left and right markers 3, and a calibration jig 4 ′, and is similar to the adjustment device of FIG. The same reference numerals are given to the parts to be described, and the description thereof is omitted. It should be noted that the projector 1 ′ emits a band-like light 72 in the vertical direction (in FIG. 6, the drawing is omitted so as not to complicate the drawing), and the band-like light 75 is also emitted in the horizontal direction. It is configured to radiate (in the example of FIG. 6, the diffusion is in the horizontal direction and the rod lens is arranged in the vertical direction).

  Correspondingly, in the calibration jig 4 ′, in addition to the configuration of the calibration jig 4, a rod-shaped body extending upward (z direction) from the free end portion of the rod-shaped body 43 extending in the left-right direction (x direction). 48 is provided with a connecting member 49 for supporting the rod-like body 48, and a reflecting member 55 is attached to the free end portion of the rod-like body 48.

  With this configuration, the free end portion (reflective member 52) of the rod-like body 42 standing from the reference point 41 and the free end portion of the rod-like body 48 standing from the free end portion of the rod-like body 43 extending in the left-right direction ( By adjusting the tripod 6 so that the light 75 in the horizontal direction passes through the reflecting member 55), the angle in the tilt direction can be adjusted more precisely.

[Embodiment 3]
FIG. 7 is a perspective view showing a configuration of a camera angle adjusting apparatus according to the third embodiment of the present invention. What should be noted in the camera angle adjustment device of the present embodiment is that the projector 1 or 1 ′ (shown as 1 in FIG. 7), the calibration jig 4 or 4 ′ (not shown in FIG. 7), And a walking mat 90. The reference marker 2 and the left and right markers 3 form the walking path 9 and are formed on the long walking mat 90 laid on the floor surface. The markers 2 and 3 may be formed on the walking mat 90 in any form such as printing, painting, and sewing.

  With this configuration, not only a permanent studio etc. but also a walking mat 90 is provided in the camera 7, the projectors 1, 1 ′, the tripod 6 and the calibration jigs 4, 4 ′ for photographing the walking state. If brought, the same imaging space can be configured at an arbitrary place.

[Embodiment 4]
FIG. 8 is a plan view of the walking mats 91 and 92 used in the camera angle adjusting device according to the fourth embodiment of the present invention. These walking mats 91 and 92 can be used in place of the walking mat 90 described above. It should be noted that in the walking mat 91 shown in FIG. 8 (a), a plurality of walking start marks 93 corresponding to the extension are further formed, and in the walking mat 92 shown in FIG. 8 (b), it is adjusted to the stride. That is, a plurality of walking start marks 94 are further formed. These walking start marks 93 and 94 are formed by printing or the like.

  When the subject starts walking from the position of these walking start marks 93 and 94, the most preferable number of steps, for example, the 4th to 6th steps, is displayed on the screen even if the subject's height and stride are different. It can be set to reach the center (portion where the optical axis of the camera 7 and the walking mats 91 and 92 intersect). For example, in the case of a subject with a step width of 70 cm, the distance traveled in 5 steps is 3.5 m. Just pull it. Similarly, by drawing a start mark (line) 94 corresponding to the stride, it can be set to reach the center of the screen at the fifth step.

  On the other hand, when a start mark (line) 93 corresponding to the height is drawn, a stride rate representing the ratio of the stride to the height is used. That is, when the average stride rate is 37%, the stride is 62.9 cm for a subject with a height of 170 cm, and the start mark (line) 93 can be easily set by calculating in the same manner as described above. .

It is a perspective view which shows the structure of the camera angle adjustment apparatus which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating the walking path where a walking motion analysis is performed, and a test subject's footprint. It is a block diagram which shows the electrical structure of a walking movement analyzer. It is a figure for demonstrating how to obtain | require a stride as an example of walking motion measurement. It is a figure for demonstrating how to obtain | require the joint angle of the upper arm as an example of walking motion measurement. It is a perspective view which shows the structure of the camera angle adjustment apparatus which concerns on the 2nd Embodiment of this invention. It is a perspective view which shows the structure of the camera angle adjustment apparatus which concerns on the 3rd Embodiment of this invention. It is a top view of the walk mat used for the camera angle adjustment apparatus which concerns on the 4th Embodiment of this invention.

Explanation of symbols

1, 1 'projector 2 reference marker 3 left and right marker 4, 4' calibration jig 5 studio 6 tripod 7 camera 8 floor 9 walking path 11 walking motion analyzer 12 walking motion measuring unit 13 walking motion analyzing unit 14 display unit 15 marker 16 Footprint 41 Reference point 42, 43, 44, 48 Rod-like body 45, 46, 47, 49 Connecting member 50 Imaging range (angle)
51, 52, 53, 54, 55 Reflective member 61 Line 62 Weight 63 Leg 71 Projection line of camera axis onto floor surface 72, 75 Band-shaped light 90, 91, 92 Walking mat 93, 94 Walking start mark

Claims (7)

A device for mounting a portable camera mounted on a tripod so as to have the same angle in a predetermined imaging space,
A projector mounted on the tripod and emitting light in a vertical plane including the optical axis of the camera;
A reference marker laid on the floor surface of the imaging space, provided at a position where a projection line of the optical axis of the camera to the floor surface should pass, and a left-right marker provided on at least one side of the reference marker;
A plate-like body or a rod-like body extending in three directions orthogonal to each other from a reference point, and having a plate-like body or a rod-like body standing at a predetermined height from the floor surface, A plate-like body or rod-like body installed on the reference marker and extending in the left-right direction so that it passes through the left-right marker, and the surface of the light from the projector extends in the depth direction from the reference point By being parallel to the body or the rod-shaped body, the optical axis of the camera passes over the reference marker, and the imaging surface of the camera is parallel to a line connecting the reference marker and the left and right markers. A camera angle adjusting device comprising: a calibration jig capable of installing the camera on a tripod. The calibration jig is composed of a combination of rod-shaped bodies, and further includes a rod-shaped body that stands up to a predetermined height from the floor surface from the free end portion of the rod-shaped body extending in the left-right direction,
The camera angle adjusting device according to claim 1, wherein the projector also emits light in a horizontal plane.   In the device to which the captured image from the camera is input, the resolution of the captured image is determined based on the number of pixels corresponding to the part whose size is known from the captured image of the predetermined part of the calibration jig. 3. The camera angle adjusting device according to claim 1, further comprising means for calibrating.   The reflection point which reflects the light from the said light projector is further provided in the corner | angular part of each said plate-shaped body and the free end part of a rod-shaped body, The said reference point, The any one of Claims 1-3 characterized by the above-mentioned. The camera angle adjustment device described in 1.   The camera angle adjusting device according to any one of claims 1 to 4, wherein the reference marker and the left and right markers are formed on a long walking mat laid on a floor surface.   6. The camera angle adjusting device according to claim 5, wherein the reference marker and the left and right markers are offset on the camera side by a predetermined interval from a center line that is a measure of walking of the subject in the walking mat. .   The camera angle adjusting device according to claim 5 or 6, wherein a walking start mark is formed on the walking mat in accordance with extension or stride.

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