A texture measuring device

Abstract

The utility model discloses a kind of texture measuring devices, it is related to 3D measurement technical field, including line laser, color camera and lens;The line laser is used to emit line laser to the object to be measured, and the color camera is used to record imaging;The lens is arranged on the optical path of reflected light formed by line laser irradiation object to be measured, for receiving reflected light, and make light imaging on the photosensitive plane of the color camera;The laser line plane formed by the line laser irradiation object to be measured, the optical center plane of the lens and the camera plane of the color camera intersect in the same straight line, to make imaging light path satisfy sharm law.Based on the technical scheme disclosed in the utility model, the blurring problem caused by object defocus can be avoided, color distortion is prevented, the clarity of imaging is fully guaranteed, and the imaging quality is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of 3D measurement technology, specifically to a texture measurement device. Background Technology

[0002] In the field of 3D measurement, 3D images generated by 3D scanners or 3D cameras lack color and texture, making it difficult to visually perceive the details of an object's surface. These details are particularly important in the scanning of cultural relics or handicrafts.

[0003] In related technologies, the current approach is to add a 2D color camera to the measuring equipment to capture the color and texture of the object's surface. However, since the surface of the object being measured is generally not on a single plane, and 2D cameras generally have a small depth of field, defocusing and blurring problems occur when using 2D cameras for imaging, resulting in poor texture imaging and color distortion due to blurring. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a texture measurement device to solve the technical problems of defocusing blur, color distortion, and poor texture imaging effect in the prior art.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: This utility model provides a texture measurement device, comprising: A line laser is used to emit a line laser beam toward the object being tested. Color cameras, used to record images; and The lens is positioned on the optical path of the reflected light generated by the online laser illuminating the object under test, and is used to receive the reflected light and make the light image on the photosensitive plane of the color camera. Wherein, the laser line surface formed by the line laser illuminating the object under test, the optical center plane of the lens, and the camera plane of the color camera intersect on the same straight line, so that the imaging optical path satisfies Schahm's law.

[0006] In some embodiments, the line laser is a white line laser, and the white line laser includes: White light laser light source, used to emit light; A collimating lens, facing the white light laser source and positioned on the light-emitting side of the white light laser source, is used to collimate the light emitted by the white light laser source; and A Powell prism, facing the collimating lens and positioned on the light-emitting side of the collimating lens, is used to receive collimated light and generate a white line laser.

[0007] In some embodiments, the divergence angle of the Powell prism is 40°-55°, and the width of the white line laser generated by the Powell prism is 10-30mm.

[0008] In some embodiments, the distance between the white laser source and the collimating lens is adjustable.

[0009] In some embodiments, the lens and the color camera are independent of each other, and the lens and the color camera are spaced apart along the direction of illumination of the reflected light.

[0010] In some embodiments, the texture measuring device further includes a base plate, on which the line laser, the lens, and the color camera are all disposed, and the color camera is angle-adjustable on the base plate.

[0011] In some embodiments, the color camera includes: The base is rotatably connected to the base plate and is used to adjust the imaging angle; A camera assembly, mounted on the base, is used for recording images; and A locking element, detachably mounted on the base, is used to lock the base onto the base plate to fix the imaging angle.

[0012] In some embodiments, the locking element is a locking bolt; the base is provided with an arc-shaped groove, the extension trajectory of which is an arc with the center of the pivot of the base and the bottom plate as the center and the line connecting the center of the arc to the center of the locking bolt as the radius; the locking bolt is disposed in the arc-shaped groove and is threadedly connected to the bottom plate.

[0013] In some embodiments, the texture measuring device further includes a top cover for covering the line laser, the lens and the color camera, the top cover being detachably mounted on the base plate, and a through hole being provided on the front side of the top cover corresponding to the line laser and the lens.

[0014] In some embodiments, a wiring hole for routing cables is also provided on the rear side of the top cover corresponding to the line laser and the color camera.

[0015] Compared with existing technologies, the texture measurement device provided by this invention emits a line laser, which illuminates the object under test, generating reflected light. This reflected light is received by a lens, and focusing allows the light to form an image on the photosensitive plane of a color camera. Since the laser line surface formed by the line laser illuminating the object, the optical center plane of the lens, and the camera plane of the color camera are all on the same straight line, the imaging optical path satisfies Scherm's law, ensuring clear imaging. By employing Scherm's law imaging, blurring caused by out-of-focus objects is avoided, preventing color distortion. Combined with the highly directional line laser, the clarity of the image is fully guaranteed, effectively improving image quality. Attached Figure Description

[0016] Figure 1 This is a first structural schematic diagram of the texture measuring device in one embodiment of the present invention; Figure 2 This is a schematic diagram of the second structure of the texture measuring device in one embodiment of the present invention; Figure 3 This is a schematic diagram of the third structure of the texture measuring device in one embodiment of the present invention; Figure 4 This is a cross-sectional view of a white light laser in one embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a color camera in one embodiment of the present invention; Figure 6 This is a top view of the lens and color camera in one embodiment of the present invention; Figure 7 This is an isometric view of the lens and color camera in one embodiment of the present invention.

[0017] Explanation of reference numerals in the attached drawings: 1. Housing; 11. Base plate; 111. Bolt hole; 12. Top cover; 121. Through hole; 122. Wiring hole; 2. White light laser; 21. Laser housing; 22. White light laser source; 23. Collimating lens; 24. Powell lens; 25. Mounting base; 251. Lower base; 252. Upper base; 3. Lens; 4. Color camera; 41. Base; 411. Arc groove; 412. Recessed platform; 42. Camera assembly; 5. Rotating shaft; 6. Locking bolt. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] To address the aforementioned technical problems, this utility model provides a texture measurement device that can avoid blurring caused by objects going out of focus, prevent color distortion, fully guarantee image clarity, and effectively improve image quality.

[0020] Please see Figure 1-3 This utility model provides a texture measurement device that can be used to image the texture and color of an object's surface. The texture measurement device includes a housing 1, in which a line laser, a lens 3, and a color camera 4 are respectively disposed. The line laser can emit a line laser towards the object to be measured. When the line laser shines on the object, it can generate reflected light. The reflected light can be received by the lens 3 and the light can be imaged on the photosensitive plane of the color camera 4.

[0021] The aforementioned housing 1 can be configured in any structural form as needed. In one embodiment, the housing 1 includes a base plate 11, which can be used to mount the aforementioned line laser, lens 3, and color camera 4. A top cover 12 is provided on the base plate 11, and a hollow cavity can be formed between the top cover 12 and the top plate. This hollow cavity can be used to accommodate the aforementioned line laser, lens 3, and color camera 4. The base plate 11 and the top cover 12 can be configured as a detachable structure. A through hole 121 can be provided on the front side of the top cover 12 corresponding to the position of the line laser and the lens 3, so that the light-emitting side of the line laser and the light-receiving part of the lens 3 can extend through the corresponding through hole 121, facilitating the formation of an imaging optical path.

[0022] Based on this, wiring holes 122 can be provided on the rear side of the top cover 12 at the positions corresponding to the line laser and the color camera 4, and the two wiring holes 122 can be used to easily connect the line laser and the color camera 4 respectively.

[0023] Please see Figure 3-4 In this embodiment, the aforementioned line laser can be a white line laser 2, which can emit white line laser light for use in imaging.

[0024] Specifically, the white light laser 2 may include a laser housing 21, on which a white light laser source 22, a collimating lens 23, and a Powell prism are respectively disposed. The laser housing 21 may be configured as a hollow cylindrical structure, and the white light laser source 22, the collimating lens 23, and the Powell prism may be sequentially arranged along the axial direction of the laser housing 21 on its inner side.

[0025] Based on this, the white light laser source 22 can emit white light to the collimating lens 23. After being collimated by the collimating lens 23, the white light can be directed to the Powell prism. The Powell prism can convert the incident light into a line laser and emit it. Therefore, on the white light laser 2, the side where the Powell prism is located constitutes the light-emitting side of the white light laser 2.

[0026] It should be noted that the collimating lens 23 and the Powell prism mentioned above are both fixedly installed inside the laser housing 21. The collimating lens 23 is positioned facing the white light laser source 22, while the Powell prism is positioned facing the collimating lens 23.

[0027] Meanwhile, the collimating lens 23 and the white laser source 22 are set with adjustable spacing. To achieve adjustable spacing, a threaded hole can be provided on one end of the laser housing 21 for mounting the white laser source 22, and a corresponding thread can be provided on the outer wall of the end of the white laser source 22 near the collimating lens 23, so that the white laser source 22 can form a threaded connection with the laser housing 21.

[0028] Thus, by rotating the white laser source 22, the white laser source 22 can be extended or retracted within the laser housing 21, thereby adjusting the distance between the white laser source 22 and the collimating lens 23. By adjusting the distance between the two, the width of the line laser can be adjusted.

[0029] Furthermore, the specific parameters of the Powell prism can be adjusted as needed. For example, in one embodiment, to ensure clear imaging of the line laser within a depth of field of 200-400mm, the divergence angle of the Powell prism can be controlled within the range of 40°-55°. At this time, by adjusting the distance between the white laser source 22 and the collimating lens 23, the Powell prism can emit a white line laser with a width of 10-30mm and a divergence angle of 45°-55°, ensuring that the clearest texture and color of the object under test are collected, thus guaranteeing the imaging quality.

[0030] Based on this, in order to install the white light laser 2 on the base plate 11, a mounting base 25 is also provided on the outside of the laser housing 21. The mounting base 25 may include a lower base 251 and an upper base 252.

[0031] The lower base 251 can be detachably fixed to the base plate 11 by bolts; the upper base 252 is located on the upper side of the lower base 251 and can be detachably fixed to the lower base 251 by bolts. A mounting hole is formed between the upper base 252 and the lower base 251, and the white light laser 2 can be horizontally inserted into the mounting hole; when the upper base 252 is locked onto the lower base 251, the upper base 252 and the lower base 251 can compress and fix the white light laser 2.

[0032] It is understandable that the mounting base 25 can also adopt other structural forms, as long as it can ensure that the white light laser 2 can be horizontally fixed on the base plate 11, and there is no specific limitation on this.

[0033] Please see Figure 3 The aforementioned lens 3 can be set on the side of the base plate 11 away from the white light laser 2. It can be used to receive the reflected light reflected by the object under test and to make the received light image on the color camera 4.

[0034] Specifically, lens 3 can be fixedly mounted on base plate 11, and the overall mounting can be horizontal. The specific fixing method between lens 3 and base plate 11 can be flexibly set according to needs. For example, it can be fixed by the simplest bolt fixing method, or other fixing methods can be used. There is no specific limitation on this.

[0035] However, it should be noted that when the white light laser 2 and the lens 3 are fixed on the base plate 11 at the same time, the axial direction of the white light laser 2 and the axial direction of the lens 3 will form an angle, that is, the lens 3 is tilted relative to the white light laser 2. However, this angle can be flexibly set as needed, and no specific limitation is made.

[0036] For example, in one embodiment, when the distance between the object under test and the white line laser 2 is 300mm, the white line laser emitted by the white line laser 2 illuminates the object under test, and the reflected light formed by the object under test can be received by the lens 3.

[0037] Understandably, in other implementation scenarios, the aforementioned angle will change by adjusting the distance between the white laser and the object under test. However, regardless of how the angle changes, it should at least be ensured that the reflected light from the object under test can be received by lens 3.

[0038] Meanwhile, the lens 3 mentioned above is preferably a lens 3 with manual focus or autofocus function. When the reflected light is received by the lens 3, focusing can make the light image clearer on the photosensitive plane of the color camera 4.

[0039] Please see Figure 3 The aforementioned color camera 4 is mainly used in conjunction with lens 3 to perform imaging and record the images.

[0040] In this embodiment, the color camera 4 and the lens 3 can be set up independently. The color camera 4 can be set on the base plate 11 near the lens 3, and the lens 3 and the color camera 4 are set at intervals along the direction of the reflected light generated by the object to be measured, so that the reflected light is first received by the lens 3, and the lens 3 images the received light onto the photosensitive plane of the color camera 4 by focusing.

[0041] To ensure image quality, the color camera 4 can be a color CMOS camera, a color CCD camera, or other camera types, but it should be able to image the texture and color of the object under test.

[0042] Based on this, such as Figure 5 As shown, to further ensure image quality, the color camera 4 is preferably set on the base plate 11 in an angle-adjustable manner. Specifically, the color camera 4 includes a base 41 and a camera assembly 42 disposed on the base 41; wherein, the base 41 can be used to connect to the base plate 11 and can be used to mount the camera assembly 42, and the camera assembly 42 can be used to cooperate with the lens 3 to achieve imaging, which can be any color CMOS camera assembly or color CCD camera assembly, and there is no specific limitation thereto.

[0043] To adjust the imaging angle, the base 41 can be rotatably connected to the base plate 11 via the pivot 5, allowing the base 41 to rotate flexibly on the base plate 11. Simultaneously, the base 41 is also equipped with a locking mechanism. When the base 41 drives the camera assembly 42 to rotate to a certain angle, the locking mechanism can lock the base 41 onto the base plate 11, preventing the base 41 from continuing to rotate.

[0044] It is understandable that different locking structures can be achieved between the base 41 and the base plate 11 through different locking components.

[0045] like Figure 6-7 As shown, in one embodiment, to achieve locking between the base 41 and the base plate 11, the locking element can be a locking bolt 6. Furthermore, an arc-shaped groove 411 is provided on the side of the base 41 away from the lens 3. This arc-shaped groove 411 can vertically penetrate the base 41 and connect to the base plate 11. Correspondingly, a bolt hole 111 is provided on the base plate 11, which can be used to engage the aforementioned locking bolt 6.

[0046] Thus, the locking bolt 6 can be vertically inserted into the arc-shaped groove 411, and its end can be threaded into the bolt hole 111 on the base plate 11; when the locking bolt 6 is tightened, the head of the locking bolt 6 can abut against the upper side of the base 41, thereby squeezing and fixing the base 41.

[0047] It should be noted that the upper opening of the arc groove 411 can be recessed to form a recessed platform 412, thereby forming a stepped structure from top to bottom on the inner side of the arc groove 411. In this way, when the locking bolt 6 is threadedly connected to the base plate 11, the head of the locking bolt 6 can be embedded in the arc groove 411 and abut against the recessed platform 412 on the inner side of the arc groove 411, thereby achieving the effect of hiding the head of the locking bolt 6.

[0048] Simultaneously, the extension trajectory of the arc-shaped groove 411 can be limited to ensure that the color camera 4 can achieve angle adjustment without completely unscrewing the locking bolt 6 from the base plate 11. Specifically, the extension trajectory of the arc-shaped groove 411 can be an arc drawn with the center of the pivot 5 between the base 41 and the base plate 11 as the center and the line connecting the center of the pivot to the center of the locking bolt 6 as the radius. In this way, when the locking bolt 6 is slightly loosened, the head of the locking bolt 6 separates from the recess 412 inside the arc-shaped groove 411, and the color camera 4 can rotate around the corresponding pivot 5.

[0049] Based on this, multiple bolt holes 111 on the base plate 11 for cooperating with the locking bolt 6 can be set along the extension trajectory of the arc groove 411, so that the locking bolt 6 can be set at different positions on the base plate 11, thereby changing the adjustable range of the imaging angle of the color camera 4.

[0050] It should be noted that, in order to ensure clear imaging of the surface texture and color of the object under test, in this embodiment, the texture measuring device can use Scherm's law to achieve clear imaging.

[0051] like Figure 3 As shown, when the white light laser 2, lens 3 and color camera 4 are all fixed on the base plate 11, the following conditions should be met between the white light laser 2, lens 3 and color camera 4: the laser line surface formed by the white light laser 2 irradiating the object under test, the optical center plane of the lens 3 and the camera plane of the color camera 4 intersect on the same straight line.

[0052] In this system, the line laser emitted by the white-light laser 2 illuminates the object under test, forming a fan-shaped laser plane, which is the aforementioned laser line plane. The optical center plane of lens 3 is a virtual plane closely related to the optical performance of lens 3; it is the plane passing through the optical center of the upper lens of lens 3 and perpendicular to the principal optical axis of lens 3. The camera plane of color camera 4 is the plane where the image sensor is located, i.e., the object carrier on which the light ultimately forms an image. For traditional film cameras, the camera plane is the plane where the film is located, while for digital cameras, the camera plane is the plane where the photosensitive element such as CMOS or CCD is located.

[0053] When the white light laser 2, lens 3, and color camera 4 meet the above conditions, the imaging optical path can satisfy Schahm's law, which can capture the clearest texture and color of the object under test, thereby ensuring the accuracy of imaging.

[0054] To better understand this utility model, the following is combined with... Figure 1-7 The technical solution of one embodiment of this utility model will be described in detail below: Before measuring the texture of the object to be measured, the white light laser 2 can be installed on the base plate 11, and the line laser emitted by the white light laser 2 can be adjusted to emit vertical light. The focal length of the white light laser 2 can be focused at 300mm. After adjustment, the white light laser 2 can be locked on the base plate 11.

[0055] After completing the above operations, the object to be tested can be placed 2300mm away from the white line laser. Then, adjust the position of the color camera 4 to center the line laser and pre-fix the color camera 4. Subsequently, adjust the focus of the lens 3 until the line laser can produce the clearest image, and then lock the position of the lens 3.

[0056] Finally, adjust the angle of the color camera 4 to ensure clear imaging at a depth of field of 200-400mm. At this point, the texture measurement device can capture the clearest texture and color of the object under test, ensuring the accuracy of the imaging.

[0057] In the description of this application, it should be noted that the terms "upper" and "lower," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0058] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0059] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A texture measuring device, characterized in that, include: A line laser is used to emit a line laser beam toward the object being tested. Color cameras are used to record images; as well as The lens is positioned on the optical path of the reflected light generated by the online laser illuminating the object under test, and is used to receive the reflected light and make the light image on the photosensitive plane of the color camera. Wherein, the laser line surface formed by the line laser illuminating the object under test, the optical center plane of the lens, and the camera plane of the color camera intersect on the same straight line, so that the imaging optical path satisfies Schahm's law.

2. The texture measuring device according to claim 1, characterized in that, The line laser is a white line laser, and the white line laser includes: White light laser light source, used to emit light; A collimating lens, facing the white light laser source and positioned on the light-emitting side of the white light laser source, is used to collimate the light emitted by the white light laser source; and A Powell prism, facing the collimating lens and positioned on the light-emitting side of the collimating lens, is used to receive collimated light and generate a white line laser.

3. The texture measuring device according to claim 2, characterized in that, The divergence angle of the Powell prism is 40°-55°, and the width of the white line laser generated by the Powell prism is 10-30mm.

4. The texture measuring device according to claim 2, characterized in that, The distance between the white laser source and the collimating lens is adjustable.

5. The texture measuring device according to claim 1, characterized in that, The lens and the color camera are independent of each other, and the lens and the color camera are spaced apart along the direction of the reflected light.

6. The texture measuring device according to claim 1, characterized in that, The texture measuring device also includes a base plate, on which the line laser, the lens and the color camera are all mounted, and the color camera is angle-adjustable on the base plate.

7. The texture measuring device according to claim 6, characterized in that, The color camera includes: The base is rotatably connected to the base plate and is used to adjust the imaging angle; A camera assembly, mounted on the base, is used for recording images; and A locking element, detachably mounted on the base, is used to lock the base onto the base plate to fix the imaging angle.

8. The texture measuring device according to claim 7, characterized in that, The locking component is a locking bolt; the base is provided with an arc-shaped groove, the extension trajectory of which is an arc with the center of the pivot of the base and the bottom plate as the center and the line connecting the center of the pivot to the center of the locking bolt as the radius; the locking bolt is disposed in the arc-shaped groove and is threadedly connected to the bottom plate.

9. The texture measuring device according to claim 6, characterized in that, It also includes a top cover for covering the line laser, the lens and the color camera, the top cover being detachably mounted on the base plate, and the front side of the top cover having through holes corresponding to the line laser and the lens.

10. The texture measuring device according to claim 9, characterized in that, The rear side of the top cover is also provided with wiring holes for routing cables, corresponding to the line laser and the color camera.

Images