JP2014032114A - Texture measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a texture measuring device that has no restriction on the size and shape of a photographable object and can be carried with ease.SOLUTION: A texture measuring device 1 includes: a tripod 2; a support base 3; a camera support part 4 and an arm support part (support medium) 5; a camera 6 mounted on the support medium; an arm 7 provided with the support medium and whose shape is the arc of a quarter round; and a plurality of light sources 8 provided on an inner edge 13 side of the arm 7 with an equal interval. The arm 7 can rotate within the area of the spherical surface of the quarter of the sphere. The camera 6 is mounted so as to be able to photograph an object located at the center of the quarter of the sphere.

Description

  The present invention relates to a texture measuring apparatus that captures an image of an object under various illumination conditions and acquires texture information of the object.

  The texture of the object means a sense received from the difference in the nature of the material of the object. Humans perceive the texture of the object by the gloss, brightness, transparency, etc. of the object surface. Therefore, in order to faithfully reproduce the texture of an object with a computer, images of the object are taken under various illumination conditions, and information such as light reflectance and diffusion according to the angle of light is acquired. There is a need to. Hereinafter, information necessary for faithfully reproducing the texture of the object by the computer is referred to as “object texture information”.

  As an example of an apparatus for acquiring texture information of an object, there are apparatuses described in Patent Document 1 and Patent Document 2, for example.

  Patent Document 1 discloses a horizontal turntable on which an object to be photographed is placed, a plurality of cameras installed on a vertical semicircular arc centered on the object on the turntable, and the same axis as the turntable. An image data measuring device is disclosed which comprises a semicircular arc arm having a plurality of light sources installed horizontally and a controller for automatically controlling these devices.

  Patent Document 2 discloses a sample table that is configured to be rotatable in the θ2 direction with the rotation axis Z2 as an axis, and is configured to be rotatable in the θ1 direction with the rotation axis Z1 as an axis, and the rotation axis Z1 as an axis. A support plate configured to be rotatable in the θ1 direction, an irradiation arm configured to be rotatable in the θ3 direction about the rotation axis Z3, and having an irradiation port at the upper end, and a light source unit disposed outside the dark box A shading information acquisition device is disclosed that includes an irradiation unit including an optical fiber that guides light from the light source unit to an irradiation port, and a camera disposed outside the dark box.

JP 2003-90715 A JP 2005-115645 A

  However, since the image data measuring device of Patent Document 1 needs to place an object to be photographed on a turntable, the image data measuring device needs to be enlarged in proportion to the size of the object. In other words, the image data measuring device of Patent Document 1 is limited in the size of the object that can be photographed. Another problem is that if the image data measuring device is too large, it cannot be easily carried.

  Similarly, the shading information acquisition apparatus disclosed in Patent Document 2 also needs to place an object to be photographed on the sample table, and thus there is a limit to the size of the object that can be photographed. There is also a problem that if the shading information acquisition device is too large, it cannot be easily carried. Furthermore, in the shading information acquisition device of Patent Document 2, the shape of the object that can be photographed is limited to a planar shape (for example, a cloth or the like).

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a texture measuring device that can be easily carried without limitation in the size and shape of an object that can be photographed. Is to provide.

  In order to achieve the above-described object, the present invention includes a support, a camera provided on the support, an arm that is rotatably provided on the support and has a quadrant arc shape, A plurality of light sources provided at equal intervals on the edge side, the arm is capable of rotating a range of a spherical surface of the quadrisphere, and the camera can photograph an object located in the center of the quadrisphere It is the texture measuring device provided in the.

  According to the texture measuring device of the present invention, it is possible to capture an image of an object under various illumination conditions and acquire the texture information of the object. In particular, the texture measuring apparatus according to the present invention does not require a table on which an object to be imaged is placed, and thus there is no limitation on the size and shape of the object that can be imaged, and it can be easily carried.

  It is desirable that the texture measuring device of the present invention further includes an arm rotation motor that rotates the arm to a position of an arbitrary rotation angle. As a result, the arm can be moved to an arbitrary position accurately and easily. As a result, the texture information of the object can be acquired accurately and easily.

  Further, the arm rotation motor in the texture measuring device of the present invention, according to a control signal from a computer, rotates the arm to a position of an arbitrary rotation angle, the plurality of light sources according to a control signal from the computer, It is desirable that only one emits light at an arbitrary timing, and the camera captures the object at an arbitrary timing according to a control signal from the computer. Thereby, the texture information of the object can be acquired automatically.

  Moreover, it is desirable that the height of the support in the texture measuring device of the present invention is variable. Thereby, the position of the camera can be determined according to the height of the object.

  According to the present invention, it is possible to provide a texture measuring device that can be easily carried without limitation in the size and shape of an object that can be photographed.

Side view of the texture measuring device 1 Front view of the texture measuring device 1 The figure explaining rotation range R and measurement range M Configuration diagram of texture measurement system 100 The figure which shows an example of the texture measuring apparatus 1

  The texture measuring apparatus of the present invention is an apparatus for capturing an image of an object under various illumination conditions and acquiring the texture information of the object. The texture measuring device of the present invention has no limitation on the size and shape of the object that can be photographed. For example, it may be a flat shape such as a cloth, a small object such as a shoe or a watch, a large object such as a vehicle, or an immovable object such as a building. In the case of fabrics and small objects, it is conceivable to shoot on a table. In the case of a vehicle, a building, etc., it is conceivable to shoot by dividing the shooting into multiple times. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a side view of the texture measuring apparatus 1. As shown in FIG. 1, the texture measuring apparatus 1 includes a tripod 2, a support base 3, a camera support unit 4 and an arm support unit 5, a camera 6, an arm 7, and a plurality of light sources 8a to 8i. . Hereinafter, the light sources 8a to 8i are sometimes collectively referred to as “light source 8”.

  The tripod 2 fixes and supports the support 3. It is desirable that the height of the tripod 2 (the height of the support) is variable. By making the height of the tripod 2 variable, the position of the camera 6 can be determined according to the height of the object. In order to make the height of the tripod 2 variable, for example, a tripod height adjustment knob 9 may be provided.

  The support base 3 fixes and supports the camera support unit 4 and the arm support unit 5. The camera support unit 4 fixes and supports the camera 6. The arm support part 5 fixes and supports the arm 7 rotatably. Hereinafter, when the tripod 2, the support 3, the camera support 4, and the arm support 5 are collectively referred to, they may be simply referred to as “support”.

  The camera 6 is placed on the camera support 4 (support). The camera 6 is placed so that an object located in the measurement range M can be photographed. The measurement range M will be described later. The performance and function of the camera 6 are not particularly limited as long as the texture information of the object can be acquired. As described above, the height of the camera 6 can be adjusted by changing the height of the tripod 2. Further, the camera support unit 4 may support the camera 6 so that the forward tilt angle (or the backward tilt angle) of the camera 6 can be adjusted. If the forward tilt angle (or backward tilt angle) of the camera 6 can be adjusted, the positional relationship between the object, the camera 6 and the light source 8 can be finely adjusted.

  The arm 7 is rotatably provided on the arm support portion 5 (support) and has a quadrangular arc shape. The quarter circle is a figure having an area of 1/4 with respect to a perfect circle having the same radius and the same center. Alternatively, the quarter circle can be said to be a figure having a circumference of 1/4 with respect to a perfect circle having the same radius and the same center. The material of the arm 7 is not particularly limited as long as it can withstand the load of the plurality of light sources 8.

  The arm 7 is rotatable around the measurement range M. For example, a shaft (not shown) is passed through the arm lower end portion 12 in the direction of the first horizontal line H1 (dashed line). An arm rotation motor 10 is desirably provided at one end of the shaft. The arm rotation motor 10 is a motor that rotates the arm 7 to a position of an arbitrary rotation angle with the first horizontal line H1 direction as a rotation axis. By providing the arm rotation motor 10, the arm 7 can be moved to an arbitrary position accurately and easily. For example, a stepping motor can be used as the arm rotation motor 10. The rotation range R of the arm 7 will be described later.

  The light source 8 is, for example, an LED (Light Emitting Diode) light. The performance and function of the light source 8 are not particularly limited as long as the texture information of the object can be acquired.

  The radius of the quarter circle that defines the shape of the arm 7 and the intensity of light emitted from the light source 8 are mutually dependent. That is, if the radius of the quarter circle that defines the shape of the arm 7 is determined, the intensity of light emitted from the light source 8 is also determined as an appropriate value. In other words, if the intensity of light emitted from the light source 8 is determined, an appropriate value is also determined for the radius of the quarter circle that defines the shape of the arm 7.

  The light sources 8 are provided at equal intervals on the inner edge 13 side of the arm 7 from the arm upper end portion 11 to the arm lower end portion 12. A wiring (not shown) for the light source 8 is provided on the outer edge 14 side of the arm 7. In the example of FIG. 1, nine light sources 8a to 8i are provided at equal intervals. Since the arm 7 has a quadrangular arc shape, the interval between the light sources 8 is defined by the center angle of the quadrant. For example, when nine light sources 8a to 8i are provided as shown in FIG. 1, the distance between the light source 8a and the light source 8b is such that the line connecting the center of the quarter circle and the light source 8a connects the center of the quarter circle and the light source 8b. The angle formed by the line is defined to be “10 degrees”. The same applies to other intervals.

  The object is arranged so that the surface to be photographed falls within the measurement range M. That is, at the time of photographing, the surface of the object to be photographed intersects the vertical line V (dashed line) drawn from the light source 8 a provided on the arm upper end portion 11 and the first horizontal line H 1 corresponding to the rotation axis of the arm 7. Located around.

  FIG. 2 is a front view of the texture measuring device 1. As shown in FIG. 2, the arm 7 of the texture measuring device 1 can rotate by 90 degrees left and right in the vertical direction, with the arm lower end 12 as a rotation axis, for a total of 180 degrees. That is, the arm upper end portion 11 is movable to a position parallel to the second horizontal line H2 (dashed line). The second horizontal line H2 is orthogonal to the first horizontal line H1 and the vertical line V.

  FIG. 3 is a diagram illustrating the rotation range R and the measurement range M. The third horizontal line H3 is parallel to the second horizontal line H2 and passes through the intersection of the vertical line V and the first horizontal line H1. As shown in FIG. 3, the rotation range R of the arm 7 is a quadrangular spherical range having the same radius and the same center as the quadrant that defines the shape of the arm 7. A quarter hemisphere is a figure having a volume of 1/4 with respect to a true sphere having the same radius and the same center. Alternatively, it can be said that the quadrisphere is a figure having a surface area of 1/4 with respect to a true sphere having the same radius and the same center.

  The camera 6 is placed so as to be able to photograph an object located at the center of the quadrisphere that defines the rotation range R. The measurement range M shown in FIG. 3 shows the range of the central part of the quadrisphere that defines the rotation range R. The measurement range M is determined depending on the radius of a quarter circle that defines the shape of the arm 7.

  FIG. 4 is a configuration diagram of the texture measurement system 100. The texture measurement system 100 is a system for automatically acquiring texture information of an object. The texture measurement system 100 includes the texture measurement device 1 and a computer 20.

  The computer 20 includes a control unit 21, a storage unit 22, a display unit 23, an input unit 24, an I / O 25, and the like.

  The control unit 21 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. The CPU calls a program stored in the storage unit 22, ROM, storage medium, or the like to a work memory area on the RAM, executes it, controls the drive of each device, and realizes the processing described later performed by the computer 20. The ROM is a non-volatile memory, and permanently stores programs such as a boot program and BIOS for the computer 20, data, and the like. The RAM is a volatile memory, and temporarily holds a program, data, and the like loaded from the storage unit 22, ROM, storage medium, and the like, and includes a work area used by the control unit 21 to perform various processes.

  The storage unit 22 is an HDD (Hard Disk Drive), for example, and stores a program executed by the control unit 21, data necessary for program execution, an OS (Operating System), and the like. With respect to the program, a control program corresponding to the OS and an application program for causing the computer 20 to execute processing to be described later are stored. Each of these program codes is read by the control unit 21 as necessary, transferred to the RAM, read by the CPU, and executed as various means.

  The display unit 23 includes a display device such as a liquid crystal panel, and a logic circuit (such as a video adapter) for realizing the video function of the computer 20 in cooperation with the display device. The input unit 24 inputs data and includes, for example, a keyboard, a pointing device such as a mouse, and an input device such as a numeric keypad. An operation instruction, operation instruction, data input, and the like can be performed on the computer 20 via the input unit 24. The display unit 23 and the input unit 24 may be integrated like a touch panel display.

  The I / O 25 is a port or a transceiver for connecting peripheral devices (such as the camera 6, the light sources 8 a to 8 i, and the arm rotation motor 10) to the computer 20. The computer 20 transmits / receives data to / from peripheral devices via the I / O 25. Examples of the I / O 25 include USB, IEEE 1394, and RS-232C ports, drive devices for reading and writing storage media, wireless LAN devices, and Bluetooth (registered trademark) transceivers. The connection form with the peripheral device may be wired or wireless.

  The camera 6, the light sources 8a to 8i, and the arm rotation motor 10 included in the texture measuring device 1 can receive a control signal from the control unit 21 of the computer 20 via the I / O 25. Further, the camera 6 can transmit captured image data to the control unit 21 of the computer 20 via the I / O 25.

  The operation of the texture measurement system 100 during shooting will be described. The object is arranged so as to fall within the measurement range M. The object does not rotate or change direction during shooting. The control unit 21 of the computer 20 transmits a control signal instructing the arm rotation motor 10 to rotate the arm 7 to a position of an arbitrary rotation angle. The arm rotation motor 10 rotates the arm 7 to a position of an arbitrary rotation angle in accordance with a control signal from the control unit 21 of the computer 20.

  The control unit 21 of the computer 20 transmits a control signal instructing the plurality of light sources 8a to 8i to emit only one light at an arbitrary timing. The plurality of light sources 8 a to 8 i instruct to emit only one light at an arbitrary timing in accordance with a control signal from the control unit 21 of the computer 20.

  In addition, the control unit 21 of the computer 20 transmits a control signal that instructs the camera 6 to photograph the object at an arbitrary timing. The camera 6 captures an object at an arbitrary timing in accordance with a control signal from the control unit 21 of the computer 20.

  For example, the control unit 21 of the computer 20 rotates the arm 7 by 1.5 degrees, and instructs the nine light sources 8a to 8i to emit light one by one at each rotation angle position. Each time the light is emitted, the camera 6 is instructed to take a picture. The camera 6 may shoot only one image for each rotation angle position of the arm 7 and light irradiation of the light source 8, or may shoot a plurality of images while changing the exposure time.

  For shooting, it is not necessary to prepare a dark room, and it may be in a natural light environment. For example, the control unit 21 of the computer 20 causes the camera 5 to photograph the object in a state where no light source 8 emits light. And the control part 21 of the computer 20 is based on the difference of the image image | photographed in the state in which none of the light sources 8 emitted light, and the image imaged in the state in which the light source 8 emitted one light. By calculating the texture information of the object, the influence of natural light can be ignored.

  For example, if the conditions are “rotate arm 7 by 1.5 degrees”, “9 light sources 8”, and “shoot 4 times with different exposure times”, (180 / 1.5) × 9 × 4 = 4,320 images will be taken.

  The images taken by the camera 6 have different illumination conditions. That is, according to the texture measurement system 100, it is possible to automatically capture an image of the object under various illumination conditions and acquire the texture information of the object. In particular, the texture measuring apparatus 1 according to the present embodiment does not require a table on which an object to be imaged is placed, and thus there is no limitation on the size and shape of the object that can be imaged, and it can be easily carried. For example, even if the object is large like a vehicle, the texture information of the vehicle can be acquired by installing the texture measuring device 1 near the surface to be photographed. Further, by dividing the photographing into a plurality of times, it is also possible to acquire texture information on every surface of the vehicle.

  FIG. 5 is a diagram illustrating an example of the texture measuring apparatus 1. In the example shown in FIG. 5, the number of the light sources 8 is nine. The light source 8 is a commercially available LED light. The radius of the quadrant that defines the shape of the arm 7 is 90 cm. The radius of the hemisphere that defines the measurement range M is 10 cm. When viewed from the front of the texture measuring device 1 as shown in FIG. 2, the horizontal measurable range corresponds to the diameter of a quadrisphere that defines the measuring range M, and is 20 cm.

  The preferred embodiments of the texture measuring device according to the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea disclosed in the present application, and these naturally belong to the technical scope of the present invention. Understood.

DESCRIPTION OF SYMBOLS 1 ......... Texture measuring device 2 ......... Tripod 3 ......... Support stand 4 ......... Camera support part 5 ......... Arm support part 6 ......... Camera 7 ......... Arm 8a-8i ......... Light source 9 ..... Tripod height adjustment knob 10 ......... Arm rotation motor 11 ......... Arm upper end 12 ......... Arm lower end 13 ......... Inner edge 14 ......... Outer edge 20 ... …… Computer 21 ... …… Control Section 22 ......... Storage section 23 ......... Display section 24 ......... Input section 25 ......... I / O
100 ......... Material quality measurement system V ......... Vertical line H1 ......... First horizontal line H2 ......... Second horizontal line M ......... Measurement range R ......... Rotation range

Claims (4)

A support;
A camera provided on the support;
An arm that is rotatably provided on the support and has a quadrant arc shape;
A plurality of light sources provided at equal intervals on the inner edge side of the arm;
Comprising
The arm is rotatable within a range of a spherical surface of a quadrisphere;
The camera is a texture measuring device provided so as to be capable of photographing an object located at the center of the quadrisphere. An arm rotation motor for rotating the arm to a position of an arbitrary rotation angle;
The texture measuring device according to claim 1, further comprising: The arm rotation motor rotates the arm to a position of an arbitrary rotation angle according to a control signal from a computer,
According to a control signal from the computer, only one of the plurality of light sources emits light at an arbitrary timing,
The texture measuring apparatus according to claim 2, wherein the camera captures the object at an arbitrary timing according to a control signal from the computer. The texture measuring device according to any one of claims 1 to 3, wherein the height of the support is variable.