JP3854599B2 - Foot type measuring instrument - Google Patents

Description

  The present invention relates to a foot-type measuring instrument that measures the sole when checking the dimensions and sole shape of each part of the sole.

  When selecting the size of a shoe when selecting a shoe, or analyzing the state of health and athletic ability in the field of medical physical education, it is desired to know the exact dimensions of each part of the foot and the shape of the sole. . Traditionally, measurements of foot length, foot width, and foot girth have been done manually using a scale (ruler) and a measure (tape), but not only the skill of the measurement operator is required, Since measurement takes time, it is a burden for the person to be measured. Furthermore, even a skilled person may have variations in measurement results due to individual differences among measurement workers, and the accuracy of measurement by manual work is insufficient. Further, it has been difficult to accurately grasp the contour shape of the sole, the shape of the ground contact surface, the weight applied to the sole, or the like by measurement using a scale (ruler) or a measure (tape).

  Therefore, as can be seen in Patent Document 1, a foot-type measuring device that captures the sole and measures the shape of the sole and the dimensions of each part from the image is known. This foot type measuring instrument irradiates the sole of the foot with a horizontal beam light (laser beam) when photographing the sole with a digital camera from the back side of the transparent plate on which the foot is placed. An image with a clear outer contour can be obtained. However, in this foot type measuring instrument, even if the contour shape of the sole periphery can be grasped from the image, the shape of the ground contact surface portion of the sole cannot be grasped. There is an inconvenience that becomes insufficient.

  On the other hand, as seen in Patent Document 2, light is incident from the side of the transparent plate on which the foot is placed, the light traveling while reflecting inside the transparent plate is reflected on the sole, and the sole is imaged from the back side of the transparent plate. Things are known. In this case, only the part in contact with the transparent plate (the contact surface part of the sole) is imaged, but the shape of the entire circumference of the sole becomes unclear.

  Thus, it is conceivable to simultaneously capture the contour shape of the outer periphery of the sole and the shape of the ground contact surface portion of the sole by allowing light to enter the transparent plate of the foot-type measuring instrument of Patent Document 1 from the side surface. This also simply illuminates the entire sole more brightly, and the boundary between the contour shape of the sole periphery and the shape of the ground contact surface of the sole cannot be clearly confirmed. There is a disadvantage that it is difficult to grasp.

In addition, as disclosed in Patent Document 1, there is a case where an image is distorted depending on a case where a sole is projected and reflected by a reflecting mirror, or depending on a photographing angle of a digital camera with respect to the sole. Since the back shape is different, there is a disadvantage that the measurement based on the image becomes inaccurate. Furthermore, this foot-type measuring device requires a laser beam generator for generating horizontal beam light, and thus has the disadvantage of an expensive and complicated device configuration.
JP 2000-296005 A Japanese Utility Model Publication No. 1-178006

  In order to eliminate such inconvenience, the present invention can not only improve measurement accuracy by obtaining a clear image of the shape of the sole, but also improve measurement efficiency and improve the measurement operator and the measurement subject. It is another object of the present invention to provide a foot-type measuring instrument that can reduce the burden and that is simple and inexpensive and is compact.

  In order to achieve such an object, the present invention includes an imaging means for imaging a foot placed on a footrest transparent plate from the back side of the footrest transparent plate, and the foot information is obtained from image information obtained by the imaging means. In a foot-type measuring instrument for measuring the back shape, the first light is introduced from the outer peripheral side end surface of the footrest transparent plate, and the second light of a color different from the first light is applied to the outer peripheral side surface of the foot. A light irradiating means is provided, and the imaging means simultaneously images the sole grounding surface illuminated by the first light and the sole outer peripheral edge illuminated by the second light. .

  When the foot is placed on the footrest transparent plate, a part of the sole adheres to the footrest transparent plate. This close contact portion is the sole contact surface portion. At this time, by introducing the first light from the outer peripheral side end surface of the footrest transparent plate, the first light traveling inside the footrest transparent plate is irregularly reflected on the foot grounding surface portion and the back surface of the footrest transparent plate From the side, a clear foot sole contact surface shape can be obtained. On the other hand, by irradiating the outer peripheral side surface of the foot with the second light, a clear contour shape of the outer periphery of the sole can be obtained from the back side of the footrest transparent plate. Since the first light and the second light are different colors, the boundary between the sole contact surface and the outer periphery of the sole becomes clear, and a clear image of the shape of the sole is obtained by the imaging means. Measurement accuracy can be improved.

  In the present invention, the footrest transparent plate and a foot accommodation chamber for accommodating the foot on the footrest transparent plate in a state where external light is blocked are provided, and the foot is placed via the foot on the footrest transparent plate. It is preferable that the top surface of the foot chamber facing the placing transparent plate is blue, the first light in the light irradiation means is white light, and the second light is red light.

  By providing the foot accommodation chamber, it is possible to take an image in a state where external light is blocked, so that the first light and the second light are not affected by the external light, and the sole grounding surface portion and the sole The outer peripheral edge can be clearly color-coded. Here, the skin color of the foot originally contains a lot of red components due to the influence of the subcutaneous blood color. For this reason, the contour of the outer periphery of the sole can be surely made red by applying red light to the outer peripheral side surface of the foot. Thereby, by making the top surface of the foot storage chamber blue and the second light red light, it is possible to clarify the contour of the outer periphery of the sole illuminated in red with the background blue. . Moreover, by making the first light white light, it is possible to include a component of the skin color of the sole contact surface portion to make the sole contact surface portion yellowish white (bright yellow). The ground contact surface portion can be made particularly conspicuous with respect to the outer peripheral edge portion of the sole illuminated in red.

  At this time, as one aspect of the light irradiating means, the light source has a single white light source, the light from the light source is the first light, and the light that is transmitted through a filter that transmits the red light. It is mentioned that light is the second light. Thereby, it is possible to generate light of two colors with a single light source, and the configuration of the apparatus can be simplified.

  Further, in the present invention, the foot accommodating chamber is constituted by a side wall standing on the entire outer periphery of the footrest transparent plate, and a cover that covers an upper end of the side wall, and the cover includes a foot in the foot accommodating chamber. An opening / closing port that can be opened and closed is provided.

  At this time, the cover is composed of a pair of stretchable film-like members superposed on each other, and the entrance / exit is formed in the first slit formed in one film-like member and the other film-like member. And a second slit extending in a direction intersecting the first slit. By forming the cover with a stretchable film-like member, it is possible to easily and quickly insert and remove the foot from the access port into the foot storage chamber. In addition, since the cover is composed of a pair of film-like members, and the first slit and the second slit intersect with each other to form an entrance / exit, it occurs at both ends of the first slit when the foot is penetrated. Since the gap is covered by the film-like members on both sides of the second slit, and the gap formed at both ends of the second slit is covered by the film-like members on both sides of the first slit, external light leakage into the foot accommodating chamber is prevented. It can be surely prevented, and a clear image of the sole can be obtained without being affected by external light.

  Further, in the present invention, it is located at substantially the same height as the portion of the side surface of the foot placed on the footrest transparent plate and projects to the outermost side, and on the outer side of the foot on the footrest transparent plate. 4 provided with four measurement reference marks which are arranged with the same interval dimension as a reference when measuring the shape of the soles, and are imaged together with the soles by the imaging means. The image processing apparatus includes calibration processing means that calibrates an image based on one measurement reference mark and uses the calibration image as image information of an imaging means.

  The calibration processing unit corrects distortion of the image captured by the imaging unit with reference to the four measurement reference marks. That is, since the four measurement reference marks are arranged with the same interval dimension, when the image is distorted, the intervals of the four measurement reference marks imaged together with the sole are the same. Don't be. Therefore, the calibration processing unit generates the calibration image by correcting the image so that the intervals of the four measurement reference marks in the image are the same. Therefore, the calibration image is used as image information used for measuring the sole shape. Thus, it is possible to accurately measure the sole shape. In addition, each measurement reference mark is located at the same height as the outermost part of the side surface of the foot placed on the footrest transparent plate, so that the side surface of the foot constituting the contour of the sole The outermost projecting portion and each measurement reference mark are imaged by being refracted equally through the footrest transparent plate. Accordingly, the calibration processing unit can generate a calibration image with higher accuracy, and thus can measure the sole shape more accurately.

  In the present invention, a measurement processing unit that calculates and measures a sole shape from image information of the imaging unit is provided, and the measurement processing unit extends from the tip of the foot toe side to the end of the heel side in the image information. The foot length is obtained from the length of the reference line using a straight line as a reference line, and extended from one first predetermined position on the reference line according to the length of the reference line to one side of the reference line. A first intersection point where the perpendicular line intersects the contour of the sole outer peripheral edge of the sole image is detected, and the reference line is determined from a second predetermined position on the reference line that is predetermined according to the length of the reference line. Detecting a second intersection where the perpendicular extending to the other side intersects with the contour of the outer periphery of the sole of the sole image, and obtaining the foot width from the distance between the first intersection and the second intersection And

  In the present invention, the measurement processing means can easily measure the foot length and the foot width from the image information of the imaging means. Generally, the length from the tip of the toe side to the end of the heel side is the foot length. Also, from the shin-side metatarsal point (the first metatarsal head, that is, the point protruding to the innermost side of the bulge of the base of the toe), the heel-side metatarsal point (the fifth metatarsal head, that is, the foot) The length up to the outermost bulge of the bone at the base of the little finger is the foot width. Accordingly, by drawing a straight line (reference line) extending from the tip of the toe side of the sole to the heel side end, the measurement processing means can easily measure the foot length from the length of the reference line.

  In addition, the present inventor is a position where when the perpendicular from the reference line passes through the shin side midfoot point, the position of the perpendicular in the reference line is a position indicating a substantially constant ratio with respect to the length of the reference line. When the vertical line passes through the heel side midfoot point, it is known that the position of the vertical line on the reference line is a position showing a substantially constant ratio with respect to the length of the reference line. Based on this, the measurement processing means extends a perpendicular line from a first predetermined position on the reference line toward one side of the reference line (for example, the protruding side of the bone at the base of the big toe), and the sole image A first intersection (for example, a tibial midfoot point) that intersects the contour of the outer periphery of the sole of the foot is detected. Similarly, a perpendicular line is extended from the second predetermined position on the reference line toward the other side of the reference line (for example, the protruding side of the bone at the base of the little toe), and the contour of the outer periphery of the sole of the sole image A second intersecting point (for example, a heel side midfoot point) is detected. The foot width can be measured very easily from the distance between the first intersection point thus detected (for example, the shin side midfoot point) and the second intersection point (for example, the heel side midfoot point). Thus, according to the present invention, it is possible to quickly and easily measure the foot length and foot width by the measurement processing means without bothering human hands.

  An embodiment of the present invention will be described with reference to the drawings. 1 is an explanatory view showing a schematic configuration of a foot measuring instrument according to the present embodiment, FIG. 2 is a longitudinal sectional explanatory view of a foot measuring instrument body, FIG. 3 is an explanatory plan view showing the inside of a foot accommodating chamber, FIG. Is an enlarged explanatory view of the main part, FIG. 5 is an explanatory view showing the structure of the cover, FIG. 6 is a flowchart showing the measurement work by the foot type measuring device of this embodiment, FIG. 7 is a flowchart showing the creation work of the calibration image, 8 is a flowchart showing the contour detection operation of the sole, FIG. 9 is a flowchart showing the contour detection operation of the sole contact surface portion, FIG. 10 is an explanatory view showing an image of the sole, and FIG. 11 is an explanatory view showing another form of the cover. FIG.

  As shown in FIG. 1, the foot-type measuring instrument 1 of the present embodiment includes a main body 2 and a personal computer 3 (hereinafter referred to as a personal computer 3). As shown in FIG. 2, an imaging means 4 (digital camera), a reflecting mirror 5, and a footrest transparent plate 6 are provided inside the main body 2, and further along the periphery of the footrest transparent plate 6. The light irradiation means 7 is provided with four measurement reference marks 8 on the upper part of the footrest transparent plate 6. Further, a cover 9 is provided on the upper portion of the main body 2, and a foot outlet / outlet 10 described later is provided in the cover 9.

  The footrest transparent plate 6 is formed in a rectangular shape having a width on which both feet can be placed by reinforced transparent glass having high strength, and is substantially horizontal by a support portion 11 provided inside the peripheral wall of the main body 2. It is supported. The inside of the main body 2 is in a state in which external light is blocked, and the space above the footrest transparent plate 6 inside the main body 2 is a foot accommodating chamber 12 for accommodating a foot.

  The reflecting mirror 5 is inclined at a predetermined angle below the footrest transparent plate 6 and reflects the sole placed on the footrest transparent plate 6 from the back surface side of the footrest transparent plate 6 toward the imaging means 4. To do.

  As shown in FIG. 1, the imaging means 4 is connected to the personal computer 3 employed as the calibration processing means and the measurement processing means of the present invention. The personal computer 3 is connected to a printer 13 for printing the sole image and the measurement result of the sole.

  As shown in FIGS. 2 and 3, the light irradiation means 7 includes a white fluorescent tube 14 disposed so as to face the side edge of the footrest transparent plate 6, and the side edge of the footrest transparent plate 6. And a light-transmitting red acrylic plate 15 erected on the upper surface. The red acrylic plate 15 is used as a filter that makes transmitted light red. As shown in FIG. 4, when the white fluorescent tube 14 is turned on, the light L <b> 1 (first light) of the white fluorescent tube 14 incident on the inside of the footrest transparent plate 6 from the outer peripheral side end face of the footrest transparent plate 6. However, it proceeds while reflecting the upper and lower surfaces of the footrest transparent plate 6. Then, a part of the light L1 is diffusely reflected on the sole ground contact surface portion in contact with the foot rest transparent plate 6 to be radiated from the lower surface of the foot rest transparent plate 6, and the shape of the sole ground contact surface is lifted. On the other hand, the light L2 (second light) transmitted through the red acrylic plate 15 is irradiated on the side surface of the foot and hits the sole (outer periphery of the sole) other than the sole grounding surface. Since the foot originally contains a red component, the outer peripheral edge of the sole is reliably made red by irradiating the side surface of the foot with red light L2 (second light). At this time, since the light L1 (first light) is white, the sole contact surface is illuminated with yellowish white (bright yellow) under the influence of the skin color. Illumination is clearly color-coded with the red color at the outer periphery.

  As shown in FIGS. 5A to 5C, the cover 9 is composed of a pair of film-like members 9a and 9b superposed on each other. The film-like members 9a and 9b are made of a light-shielding, elastic and elastic material, and at least the lower surface (inner surface) is blue.

  Further, as shown in FIG. 5B, the upper film-like member 9a is formed with a pair of first slits 10a extending in a direction intersecting the front-rear direction of the foot. The first slit 10a is a cut having a length that allows the foot to pass therethrough. As shown in FIG. 5C, a pair of second slits 10b extending along the front-rear direction of the foot is formed in the lower film-like member 9b. As shown in FIG. 5A, the second slit 10b is provided at a position that intersects the first slit 10a when the two film-like members 9a and 9b are overlapped with each other, so that the foot can pass therethrough. It is a notch having a length. That is, the first slit 10a and the second slit 10b constitute a foot entrance / exit 10, and the first slit 10a and the second slit 10b are easily opened when the foot is in / out. Further, when the foot is in the foot storage chamber 12 (see FIG. 2), the first slit 10a and the second slit 10b are closed by restoring elasticity in the direction intersecting each other, so that there is a gap between both ends of the second slit 10b. Even if it is formed, it is covered by the upper film-like member 9a, and even if a gap is formed at both ends of the first slit 10a, it is closed by the lower film-like member 9b, so that external light is transmitted into the foot storage chamber 12. Leakage is prevented. Furthermore, when putting a foot on the footrest transparent plate 6, the foot can be passed through the entrance 10 with the first slit 10 a as a target.

  The measurement reference mark 8 is a green LED (light emitting diode), and is provided at the four corners of the footrest transparent plate 6 as shown in FIG. The intervals between the adjacent measurement reference marks 8 are all equal, and in this embodiment, each measurement reference mark 8 is 300 mm. Further, as shown in FIG. 2, each measurement reference mark 8 has substantially the same height dimension H as that of the outermost portion of the side surface of the foot placed on the footrest transparent plate 6 (that is, the LED). A light emitting part is provided (with a distance H from the footrest transparent plate 6). By doing so, as will be described later, the light from the measurement reference mark 8 is refracted and transmitted through the footrest transparent plate 6 in the same manner as the contour of the sole illuminated when detecting the sole area. Therefore, it is possible to prevent a decrease in imaging accuracy due to refraction. In addition, this inventor has discovered that it is preferable to set the height dimension H to 5-20 mm by various tests. The shape of the measurement reference mark 8 is not limited, but when a hemispherical LED is used, the measurement reference mark 8 is arranged with the tip which is the hemispherical side facing down and the light emitting portion facing upward. At this time, if the radius of the hemispherical LED is equal to the height dimension of the outermost portion of the side surface of the foot, the LED is simply placed on the footrest transparent plate 6 as shown in FIG. The height dimension H can be very easily adjusted to the height of the portion of the side surface of the foot that protrudes to the outermost side.

  Next, the operation of the foot-type measuring instrument 1 of the present embodiment having the above configuration will be described. As shown in FIG. 2, the foot F is placed on the footrest transparent plate 6, and the imaging means 4 (digital camera) is operated to image the sole including the measurement reference mark 8 through the reflecting mirror 5. If the imaging is completed, the person to be measured may take his / her foot out of the foot chamber 12. An image picked up by the image pickup means 4 is taken into the personal computer 3, and calibration processing and measurement processing are performed by the personal computer 3. In the captured image, the background is blue, and the left and right soles and the four measurement reference marks 8 color-coded by the light irradiation means 7 are reflected.

  Here, the processing by the personal computer 3 will be described. As shown in FIG. 6, first, an image from the imaging means 2 is read (STEP 1), and the read image is calibrated based on the four measurement reference marks 7 (STEP 2). ). Thereby, a calibration image in which the distortion of the image is corrected is obtained.

  If the calibration image formation in STEP 2 is described in more detail, as shown in FIG. 7, first, the read color image (hereinafter referred to as the original image) is converted into RGB values (red, green, blue) for each pixel in STEP 2-1. Convert to HSB value (hue, saturation, brightness). Next, if the measurement reference mark 7 is green, in STEP2-2, it is determined whether or not it is green based on the HSB value of the pixel. If the pixel is green, the pixel is converted to white in STEP2-3. If the pixel is a color other than green, the pixel is converted to black in STEP 2-4. The detection condition of green in STEP2-2 is determined according to the color of the measurement reference mark 8, and in this embodiment, the HSB values of B ≧ 60, S ≧ 70, 120 ° ≧ H ≧ 90 ° are green ( The color of the measurement reference mark 8). Then, in STEP 2-5, black and white conversion is performed on all the pixels constituting the image, and in STEP 2-6, a binary image is formed with each measurement reference mark 8. Next, the positions of the four measurement reference marks 8 are detected from the binary image in STEP 2-7, and the barycentric points of the four measurement reference marks 8 are detected in STEP 2-8. Subsequently, in STEP 2-9, the original image is trimmed with the four gravity reference points of the four measurement reference marks 8 as the four corners. Further, in STEP 2-10, the interval between the barycentric points of the original image after trimming is corrected uniformly. Thereby, it is possible to form a calibration image (color image in which the background is blue and the right and left soles are color-coded by the light irradiation means 7) in which the distortion of the image at the time of shooting is corrected (FIG. 10). reference).

  Next, as shown in FIG. 6, the measurement operator inputs a reference line 16 to each of the left and right sole images displayed on the screen (STEP 3). As shown in FIG. 10, the reference line 16 is a straight line that passes through the second fingernail tip of the sole and reaches the heel side rear end.

  Subsequently, as shown in FIG. 6, the contour of the sole is detected based on the calibration image formed in STEP 2 (STEP 4). That is, in STEP 4, as shown in FIG. 8, the calibration image is converted into an HSB value for each pixel in STEP 4-1. Next, in STEP 4-2, it is determined whether or not the region is the sole region based on the HSB value of the pixel. If the pixel indicates an HSB value (including a yellow component to a red component) indicating the sole region, STEP 4-3. The pixel is converted to white, and if the pixel is a color (background color) other than the HSB value indicating the sole region, the pixel is converted to black in STEP 4-4. Note that the detection condition of the sole region in STEP4-2 is 15 ≦ B ≦ 55 when the HSB value is 0 ≦ B ≦ 100, 15 ≦ S ≦ 100, and H ≦ 90 ° or H ≧ 314 °. And 21 ≦ S ≦ 98 and H <200 ° or H ≧ 312 °, 55 ≦ B ≦ 100, 0 ≦ S ≦ 94, and 0 ≦ H ≦ 110 °. Sometimes the sole area. Next, in STEP 4-5, black and white conversion under the above conditions is performed for all pixels constituting the image. Then, in STEP 4-6, the contours of the left and right sole regions are extracted, and in STEP 4-7, contour lines 17 (see FIG. 10) are overlapped along the contours of the left and right soles of the calibration image. Here, the detection condition of the sole region is selected to include a yellow component to a red component, but in addition to the foot originally including a red component, the side of the foot is irradiated with red light L2. Therefore, the contour of the outer peripheral edge portion of the sole is surely made red, and the contour line 17 (see FIG. 10) is easily extracted.

  Subsequently, as shown in FIG. 6, the contour of the sole contact surface portion is detected from the calibration image (STEP 5). In STEP5, as shown in FIG. 9, first, the RGB value is converted into the HSB value for each pixel in STEP5-1 of the calibration image. Next, in STEP5-2, it is determined based on the HSB value of the pixel whether or not it is a region of the foot contact surface, and if the pixel is an HSB value (including a yellow component) indicating the region of the foot contact surface, STEP5-3. In step 5-4, the pixel is converted to white. If the pixel is in a color other than the HSB value indicating the area of the sole ground contact surface, the pixel is converted to black. Note that the detection condition of the area of the foot contact surface in STEP5-2 is that the foot contact surface is made yellowish white by the light L1 (first light), so that the HSB value is 47 ≦ B ≦ 100, and When 0 ≦ S ≦ 100 and 53 ≦ H ≦ 114 °, it is set as the region of the sole contact surface portion. Next, in Step 5-5, black and white conversion is performed on all the pixels constituting the image under the above conditions. Then, in STEP 5-6, the contours of the regions of the left and right sole ground contact surface portions are extracted, and in STEP 5-7, contour lines 18 (see FIG. 10) are superimposed along the contours of the left and right soles of the calibration image.

  Accordingly, in the calibration image formed by STEP2 shown in FIG. 6, in addition to the reference line 16 input in STEP3, the contour line 17 of the sole generated in STEP4 and the sole contact surface portion generated in STEP5 are included. The contour line 18 is drawn, and the sole image 19 for measurement is displayed on the screen of the personal computer 3 as shown in FIG.

  As already shown in FIG. 10, the reference line 16 is a straight line passing through the second toe of the sole and reaching the heel side end in the measurement sole image 19, as shown in FIG. One end of the reference line 16 on the second fingernail tip side is, for example, at the position of the intersection 20 with the contour line 17 of the second fingernail tip when the second finger is at the leading edge, and the first finger is at the leading edge. In some cases, it extends to the outside of the contour line 17 of the second fingernail tip and becomes a position corresponding to the forefront of the first finger.

  In the personal computer 3, as shown in FIG. 6, first, the lengths of the left and right feet are measured from the length of each reference line 16 (STEP 6). The dimension of the foot length at this time is measured with reference to the distance dimension between the four measurement reference marks 8.

  Next, the foot width dimension is measured based on the reference line 16 (STEP 7), and the foot circumference dimension is measured based on the foot width (STEP 8). In STEP 7, as shown in FIG. 10, from the first predetermined position on the reference line 16 (position 72.4% of the length of the reference line 16 from the heel end), the bone at the base of the toe A perpendicular line 21 is extended toward the bulging side, and a point that intersects the contour line 17 of the sole of the sole image 19 is defined as a shin side midfoot point 22. At the same time, the vertical line 23 is extended from the second predetermined position on the reference line 16 (position of 63.2% of the length of the reference line 16 from the heel end) toward the bulging side of the base of the little toe. A point that intersects the contour line 17 of the sole of the sole image is defined as a heel side middle foot point 24. Then, the foot width dimension is measured from the length of the straight line 25 connecting the shin side midfoot point 22 and the heel side midfoot point 24. When the foot width dimension is measured, the foot circumference dimension is calculated from the foot width dimension / 0.413 in STEP 8 shown in FIG.

  Subsequently, the heel width dimension is measured based on the reference line 16 (STEP 9). In STEP 9, as shown in FIG. 10, a straight line 26 orthogonal to a third predetermined position on the reference line 16 (a position that is 16% of the length of the reference line 16 from the rearmost end on the heel side) is extended, and the sole image is displayed. The width of the heel is measured from the distance between two points 27 and 28 that intersect the contour line 17 of the sole of the foot.

  Furthermore, as shown in FIG. 6, the measurement of the size of the tread portion based on the reference line 16 (STEP 10), the measurement of the first heel side angle and the fifth heel side angle (STEP 11), and the contact area ratio of the entire sole Measurement (STEP 12) is possible. As shown in FIG. 10, the measurement of the size of the tread in STEP 10 is performed by a straight line 29 orthogonal to the fourth predetermined position on the reference line 16 (a position 55% of the length of the reference line 16 from the rearmost end). Is measured from the distance from the reference line 16 to the intersection 30 of the contour line 18 of the sole ground contact surface portion. At this time, when the intersection 30 is on the outside of the foot (the direction of the little toe side), a positive value is assumed. When the intersection 30 is on the inside of the foot (the direction of the thumb of the foot), the arch is assumed to be a negative value. Can be confirmed. As shown in FIG. 10, the measurement of the first heel side angle in STEP 11 is performed by first calculating the intersection 27 detected in STEP 9 shown in FIG. 6 and the shin side midfoot point 22 detected in STEP 7 shown in FIG. A straight line 31 is drawn, and then a vertical line 32 is extended from the fifth predetermined position on the reference line 16 (position 90% of the length of the reference line 16 from the heel end) to the toe of the foot. A straight line 34 passing through the point 33 that intersects the contour 17 of the sole of the image and the shin side middle foot point 22 detected in STEP 7 shown in FIG. 6 is drawn. At this time, the angle θ1 between the straight line 31 and the straight line 34 is measured to obtain the first heel side angle. The fifth heel side angle can be confirmed by measuring the angle θ2 between the straight line 35 and the straight line 36 drawn in the same manner. The measurement of the contact area ratio with respect to the entire sole in STEP 12 is calculated from the area of the sole detected in STEP 4 and the area of the sole contact surface portion detected in STEP 5.

  Then, each measurement result described above is output from the printer 13. By doing so, it is possible to select a shoe having a size or shape that matches the foot shape from the foot length dimension, the foot width dimension (foot circumference dimension), the heel width dimension, and the like. In addition, the tendency of hallux valgus etc. can be confirmed from the first heel side angle and the fifth heel side angle, and the tendency of flat feet etc. can be confirmed from the dimensions of the treads. More detailed advice is possible for those who have. Furthermore, it is possible to check the weight applied to the foot and the left / right balance from the contact area ratio. As described above, according to the foot type measuring instrument 1 of the present embodiment, the shape of the sole can be accurately measured with a simple configuration, so that the selection of shoes and the health condition in medical and physical education can be performed. And exercise ability can be analyzed very easily.

  In the present embodiment, further, by collecting the collected measurement results, it can be statistically processed and used for feedback to the manufacture of shoes or for customer management.

  In the present embodiment, the side surface of the foot is color-coded red (hue angle 0 degree), the measurement reference mark 8 is green (hue angle 120 degrees), and the cover 9 (background) is blue (hue angle 210 degrees). By doing this, the color of each part of the image has a hue angle difference of 90 to 120 degrees, and the best discrimination is possible, but it is possible to clearly color each part as a different color. For example, other colors may be adopted.

  The image pickup means 4 employs a digital camera in the present embodiment, but adopts a video camera such as a CCD camera or a MOS camera, or an optical scanning sensor in addition to the digital camera. Also good.

  Further, instead of the fluorescent tube 14, an incandescent light source, a heat radiation type light source, a light emitting diode or the like may be employed as the light source for irradiating the side surface of the foot. Further, a red light emitting diode may be adopted instead of the red acrylic plate 15 for the red light applied to the side of the foot.

  Further, in the present invention, instead of the cover 9 shown in FIG. 5A, as shown in FIG. 11, a cover 37 constituted by a single film-like member 36 may be provided. The cover 37 is provided with a slit 38 having a length that allows the foot to be taken in and out, and a slide fastener 39 or the like can be further provided in the slit 38 so that the cover 37 can be opened and closed. Thereby, even if the size of the foot passing through the slit 38 is different, the gap with the foot can be easily closed by the slide fastener 39, and leakage of external light into the foot accommodating chamber 12 can be prevented. it can.

  Further, in the present embodiment, the description has been given by taking an image of both feet simultaneously, but the present invention is not limited to this, and as another embodiment, although not shown, a footrest transparent plate is mounted on only one foot. It is also possible to reduce the size of the device itself.

Explanatory drawing which shows schematic structure of the foot type measuring device of one Embodiment of this invention. The longitudinal cross-sectional explanatory drawing of a foot type measuring device main body. Explanatory top view which shows the inside of a leg storage chamber. Expansive explanatory drawing of the principal part. (A) is a perspective view which shows the structure of a cover, (b) is a top view of one membrane-like member, (c) is a top view of the other membrane-like member. The flowchart which shows the measurement operation | work by the foot type measuring device of this embodiment. The flowchart which shows the preparation work of a calibration image. The flowchart which shows the contour detection operation | work of a sole. The flowchart which shows the contour detection operation | work of a sole contact surface part. Explanatory drawing which shows the image of a sole. Explanatory drawing which shows the other form of a cover.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Foot type measuring device, 3 ... Personal computer (calibration processing means, measurement processing means), 4 ... Imaging means, 6 ... Foot rest transparent plate, 7 ... Light irradiation means, 8 ... Measurement reference mark, 9, 37 ... Cover , 9a, 9b ... membrane-like member, 10 ... inlet / outlet, 10a ... first slit, 10b ... second slit, 12 ... foot storage chamber, 14 ... white fluorescent tube (white light source), 15 ... red acrylic plate (filter) , 16 ... reference line, 22 ... shin side midfoot point (first intersection), 24 ... heel side midfoot point (second intersection).

Claims (7)

In a foot type measuring instrument that includes an imaging unit that images a foot placed on a footrest transparent plate from the back side of the footrest transparent plate, and measures a sole shape from image information obtained by the imaging unit,
Introducing the first light from the outer peripheral side end surface of the footrest transparent plate, and providing a light irradiation means for irradiating the outer peripheral side surface of the foot with the second light of a color different from the first light,
The foot-type measuring instrument characterized in that the imaging means simultaneously images the sole contact surface illuminated by the first light and the sole outer peripheral edge illuminated by the second light. A foot accommodating chamber for accommodating the footrest transparent plate and the feet on the footrest transparent plate in a state of blocking external light;
The top surface of the foot storage chamber facing the footrest transparent plate via the feet on the footrest transparent plate is blue, the first light in the light irradiation means is white light and the second light The foot-type measuring device according to claim 1, wherein the light is red light.   The light irradiating means has a single white light source, the light from the light source is the first light, and the light from the light source that is transmitted through a filter that makes the transmitted light red is the second light. The foot type measuring device according to claim 2, wherein   The foot storage chamber is composed of a side wall that stands on the entire outer periphery of the footrest transparent plate, and a cover that covers an upper end of the side wall. The foot type measuring device according to claim 2 or 3, wherein a mouth is provided. The cover is composed of a pair of stretchable film members superposed on each other,
The inlet / outlet comprises a first slit formed in one film-like member and a second slit formed in the other film-like member and extending in a direction intersecting the first slit. Item 5. A foot-type measuring instrument according to item 4. It is positioned at substantially the same height as the outermost portion of the side surface of the foot placed on the footrest transparent plate, and measures the sole shape on the outside of the foot on the footrest transparent plate. Provided with four measurement reference marks which are arranged with the same interval dimension as a reference and are imaged together with the sole by the imaging means,
6. The apparatus according to claim 1, further comprising a calibration processing unit that calibrates an image based on four measurement reference marks imaged by the imaging unit and uses the calibration image as image information of the imaging unit. The foot type measuring instrument described. Comprising measurement processing means for computing and measuring the sole shape from the image information of the imaging means,
The measurement processing means obtains the foot length from the length of the reference line using a straight line extending from the tip of the toe side of the sole to the rear end of the heel side in the image information as a reference line, and in advance according to the length of the reference line Detecting a first intersection where a perpendicular extending from one first predetermined position on the reference line to one side of the reference line intersects the contour of the outer periphery of the sole of the sole image, and the reference line A second intersection point where a perpendicular extending from the second predetermined position on the reference line, which is predetermined according to the length of the reference line, to the other side of the reference line intersects the contour of the outer periphery of the sole of the sole image The foot type measuring device according to any one of claims 1 to 6, wherein the foot width is detected and a foot width is obtained from a distance between the first intersection and the second intersection.

Images