CN113465538A - Speckle projection device, manufacturing method of speckle projection device and electronic equipment - Google Patents
Speckle projection device, manufacturing method of speckle projection device and electronic equipment Download PDFInfo
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- CN113465538A CN113465538A CN202110749195.XA CN202110749195A CN113465538A CN 113465538 A CN113465538 A CN 113465538A CN 202110749195 A CN202110749195 A CN 202110749195A CN 113465538 A CN113465538 A CN 113465538A
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- speckle
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/2433—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring outlines by shadow casting
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/48—Laser speckle optics
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
Abstract
The embodiment of the invention relates to the technical field of optics, and discloses a speckle projection device, a manufacturing method of the speckle projection device and electronic equipment. In the present invention, a speckle projection apparatus includes: the device comprises a light source, a slide and an imaging lens, wherein the light source is used for providing a light beam projected onto the slide; the projection film is formed by photoetching on a light-transmitting substrate according to a preset speckle pattern and is used for filtering the light beam to form a speckle light beam, and the speckle light beam is used for projecting to an object to be measured; the imaging lens is used for acquiring an image when the speckle beam is projected on the object to be measured. The speckle pattern can be ensured to meet the high-precision requirement of the speckle projection device while the cost is reduced and the speckle projection device is flexibly assembled.
Description
Technical Field
The embodiment of the invention relates to the technical field of optics, in particular to a speckle projection device, a manufacturing method of the speckle projection device and electronic equipment.
Background
With the development of related technologies, machine vision technology becomes more and more important in production and life, and especially in a three-dimensional (3-dimension, 3D) measurement scene, such as the fields of electronic consumption, industrial automation and the like, a speckle structured light projection scheme is more and more widely applied. The speckle structure light projection scheme generally projects speckles on the surface of an object to be measured, and provides reference characteristics for 3D reconstruction and positioning of the object to be measured through the distribution pattern of the speckles on the surface of the object to be measured, so that the precision of application such as three-dimensional positioning, reconstruction and the like is greatly improved. In particular, speckle structured light projection schemes are typically implemented based on two prevailing technical routes: the speckle projection scheme based on the DLP has wide application in industrial structured Light projection machines, has the advantages of flexibly changing the pattern of speckle patterns, and being capable of forming a high-precision three-dimensional measurement system of space structured Light and time structured Light, and the speckle projection scheme based on the VCSEL and the DOE is widely applied in the field of electronic consumption, for example, a miniaturized speckle projection device is integrated in some mobile phones, so that 3D face recognition unlocking is realized.
However, the DLP-based speckle projection scheme requires the use of a DLP chip, which is expensive, so the customized development cost of the speckle projection apparatus is high, which often results in a great investment in the scheme from development to single-product production, and the assembly of the DLP-based speckle projection apparatus is actually based on optical devices of some specific scenes, so the speckle projection apparatus often needs to be customized, cannot replace optical components at will, and often can only be re-developed and produced for specific applications or specific cases; the speckle projection scheme based on VCSEL and DOE needs to use the speckle pattern of DOE to form the speckle beam projected on the object to be measured, but is limited by DOE manufacturing process, the number of spots in the speckle pattern DOEs not exceed 5 ten thousand points, and the size of the spots is not less than 2 millimeters at 1 meter, namely, the spots in the speckle pattern are large and relatively dispersed, so that the precision of the speckle projection device is low, and the requirement of a high-precision measurement scene cannot be met.
Disclosure of Invention
The embodiment of the invention aims to provide a speckle projection device, a manufacturing method of the speckle projection device and electronic equipment, so that the speckle projection device can be flexibly assembled while the cost is reduced, and the measurement scene has higher precision.
To solve the above technical problem, an embodiment of the present invention provides a speckle projection apparatus, including: the device comprises a light source, a slide and an imaging lens, wherein the light source is used for providing a light beam projected onto the slide; the projection film is formed by photoetching on a light-transmitting substrate according to a preset speckle pattern and is used for filtering the light beam to form a speckle light beam, and the speckle light beam is used for projecting to an object to be measured; the imaging lens is used for acquiring an image when the speckle beam is projected on the object to be measured.
In order to solve the above technical problem, an embodiment of the present invention further provides a method for manufacturing a speckle projection apparatus, including: photoetching is carried out on the light-transmitting substrate according to a preset speckle pattern to form a projection film; assembling a light source, an imaging lens and the projection film to form a speckle projection device; wherein the light source is used for providing a light beam projected on the slide; the projection film is used for filtering the light beam to form a speckle light beam, and the speckle light beam is used for projecting to an object to be measured; the imaging lens is used for acquiring an image when the speckle beam is projected on the object to be measured.
In order to solve the above technical problem, an embodiment of the present invention further provides an electronic device, including: a speckle projection arrangement as described above.
According to the speckle projection device provided by the embodiment of the invention, the projection sheet is manufactured by using the photoetching technology, as the photoetching technology can etch and form tens of thousands or even hundreds of thousands of speckle spots in the micron-level size in a certain area, namely, speckle patterns meeting the high-precision requirement of the speckle projection device can be etched, and the cost of the photoetching technology is low, the manufacturing cost and the manufacturing difficulty of the device can be reduced, and the precision can be provided at the same time. In addition, the invention increases the flexibility of replacing the components in the device, and can replace related modules according to various application scenes, thereby realizing the flexible assembly of the speckle projection device.
In addition, according to the speckle projection device provided by the embodiment of the invention, the light-transmitting substrate is made of white glass. Because the white glass has very high luminousness, consequently, can avoid the light beam to take place great loss when passing the printing opacity base plate of projection piece, guarantee the brightness of the facula that the speckle light beam on the projection to the determinand formed for the image facula that imaging lens acquireed is more clear, is favorable to follow-up analysis. In addition, the speckle piece manufactured by taking white glass as a substrate is low in cost, so that the speckle projection device has high light transmittance and is favorable for reducing the cost of the speckle projection device.
In addition, according to the speckle projection apparatus provided by the embodiment of the present invention, the size and the number of the speckles in the preset speckle pattern are related to the image resolution of the imaging lens, wherein the imaging lens is related to an application scene of the speckle projection apparatus. The imaging lens needed to be used is determined according to the specific application scene of the speckle projection device, and then the size and the number of the spots in the speckle pattern are determined according to the resolution of the imaging lens, so that the precision and the function of the speckle projection device can be adapted to the actual application scene, under the condition of meeting the scene precision requirement, a proper imaging lens and a projection film with proper manufacturing precision are selected, and the cost of the device is reduced.
In addition, in the speckle projection apparatus provided in the embodiment of the present invention, the collimating module is located between the projection sheet and the focusing module, the collimating module is configured to collimate the light beam before the light beam is projected onto the projection sheet, and the focusing module is configured to focus the collimated light beam before the light beam is projected onto the projection sheet. The collimating module is added between the light source and the projection sheet, so that the light beam emitted by the light source and having a large divergence degree can be parallel, divergence is reduced, the light beam can be projected onto the projection sheet as far as possible, and is not projected onto other positions along the divergence direction, the focusing module is added between the collimating module and the projection sheet, so that the collimated and parallel light beam can be projected onto the projection sheet through focusing, and the area of the projection sheet is not required to be more than or equal to the area of the light beam in order to project the light beam onto the projection sheet.
In addition, in the speckle projection apparatus provided by the embodiment of the present invention, the collimating module includes a collimating lens group, the light source is a light emitting diode LED lamp array, and each LED lamp in the LED lamp array corresponds to one collimating lens in one collimating lens group. The LED lamp has small volume, large luminous intensity and high cost performance, is favorable for further enhancing the luminous intensity of a light source by using the lamp array while being beneficial to the miniaturization of the speckle projection device, ensures that light spots formed by speckle beams projected on an object to be detected are clearer, and is favorable for utilizing light spot patterns to analyze.
In addition, according to the speckle projection apparatus provided by the embodiment of the invention, the number and arrangement mode of the LED lamps in the LED lamp array are related to the optical power requirement of the speckle projection apparatus. The LED lamp array is arranged to be matched with the optical power of the speckle projection device, so that the optical power requirement of the speckle projection device can be guaranteed, excessive LED lamps are not added, and the problems that the cost is too high and the LED lamp array is too large in size are solved.
In addition, in the speckle projection apparatus provided by the embodiment of the present invention, the focusing module is a plano-convex spherical lens, a focusing angle of the plano-convex spherical lens is the same as a chief ray angle of the imaging lens, and a size of the plano-convex spherical lens is related to a minimum envelope circle of the LED array. The size of the plano-convex spherical lens is matched with the minimum enveloping circle of the LED lamp array, so that the size of the plano-convex spherical lens can receive the light beam after collimation, the waste is not caused too much, and the focusing angle of the plano-convex spherical lens is the same as the chief ray angle of the imaging lens, so that the image acquired by the imaging lens can be ensured to have certain definition. In addition, the plano-convex spherical mirror has low cost, and the cost of the speckle projection device is reduced to a certain extent when the plano-convex spherical mirror is used as a focusing device.
In addition, according to the speckle projection apparatus provided by the embodiment of the present invention, the distance between the projective film and the plano-convex spherical lens is determined according to the preset minimum enveloping circle of the speckle pattern and the focusing angle of the plano-convex spherical lens, so that the light beams can be projected onto the projective film, and the speckle beams formed by penetrating through the projective film can have higher intensity.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
FIG. 1 is a schematic diagram of a speckle projection apparatus provided by an embodiment of the invention;
FIG. 2 is a schematic diagram of a partial speckle projection apparatus including a collimating module and a focusing module according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of a portion of a speckle projection apparatus including size markers according to another embodiment of the present invention;
FIG. 4 is a flow chart of a method of making a speckle projection apparatus according to another embodiment of the invention;
FIG. 5 is a flow chart of a method for making a speckle projection apparatus including a chrome plating step according to another embodiment of the present invention;
fig. 6 is a schematic structural diagram of a slide involved in a method for manufacturing a speckle projection apparatus according to another embodiment of the present invention.
Detailed Description
As is known in the background art, two main implementations of speckle projection in the related art are: one is a Digital Light Processing (DLP) based speckle projection scheme, and the other is a Vertical-Cavity Surface-Emitting Laser (VCSEL) and Diffractive Optical Element (DOE) based speckle projection scheme. However, the DLP-based speckle projection scheme requires the use of a DLP chip, which is expensive and requires the arrangement of a corresponding optical component for the DLP chip to obtain the speckle projection apparatus, and therefore, the speckle projection apparatus is often customized and the optical component cannot be replaced at will; the speckle pattern in the VCSEL and DOE based speckle projection scheme is determined by the DOE, and is limited by the DOE manufacturing process, and the spots in the formed speckle pattern are large and relatively dispersed, so that the accuracy of the speckle projection device is low.
In order to reduce the cost and realize flexible assembly of the speckle projection device, and ensure that the size and the number of speckle patterns meet the precision requirement of the speckle projection device, an embodiment of the invention provides a speckle projection device, which comprises: the device comprises a light source, a slide and an imaging lens, wherein the light source is used for providing a light beam projected onto the slide; the projection film is formed by photoetching on a light-transmitting substrate according to a preset speckle pattern and is used for filtering the light beam to form a speckle light beam, and the speckle light beam is used for projecting to an object to be measured; the imaging lens is used for acquiring an image when the speckle beam is projected on the object to be measured.
According to the speckle projection device provided by the embodiment of the invention, the projection lens is manufactured by utilizing the photoetching technology, as the photoetching technology can etch and form tens of thousands or even hundreds of thousands of speckle spots in micron-level size in a certain area, namely, high-precision speckle patterns can be etched, and the cost of the photoetching technology is low, the manufacturing cost and the manufacturing difficulty of the device can be reduced, and the precision can be provided at the same time. In addition, the DLP is not used, the limitation to the lamp of an optical device is avoided, the replacement flexibility of the components in the device is improved, and the relevant modules can be replaced according to various different application scenes, so that the flexible assembly of the speckle projection device is realized.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments. The following embodiments are divided for convenience of description, and should not constitute any limitation to the specific implementation manner of the present invention, and the embodiments may be mutually incorporated and referred to without contradiction.
The following describes the implementation details of the speech recognition method of the present embodiment in detail, and the following is only provided for the convenience of understanding and is not necessary for implementing the present embodiment.
Referring to fig. 1, a speckle projection apparatus 100 includes a light source 101, a slide 102, and an imaging lens 103.
Wherein, the light source 101 is used for providing a light beam projected on the slide 102; the projection sheet 102 is used for filtering the light beam provided by the light source 101 to form a speckle light beam, and the speckle light beam is used for projecting to an object to be measured; the imaging lens 103 is used to acquire an image when the speckle beam is projected on the object to be measured.
It should be noted that a horizontal line passing through the slide 102 and the imaging lens 103 in fig. 1 is a schematic diagram of a propagation path of the light beam provided by the light source 101, and does not constitute a component of the speckle projection apparatus 100. And the vertical line finally reached by the horizontal line passing through the slide 102 and the imaging lens 103 is a simulation of the imaging plane and does not constitute an integral part of the speckle projection apparatus 100.
It should be further noted that the above description is provided in terms of measuring and imaging the object to be measured by using the speckle projection apparatus 100, and the object to be measured is located outside the speckle projection apparatus 100, rather than being included in the speckle projection apparatus 100.
It is worth mentioning that the slide 102 is formed by photolithography on a transparent substrate according to a predetermined speckle pattern. The principle of speckle projection is as follows: the speckle light beam with a certain pattern is projected on the surface of an object to be measured, the pattern is projected on the object to be measured to be deformed, and the deformed pattern is analyzed to realize the measurement of the object to be measured, wherein the deformation of the pattern is mainly reflected in the change of the distribution position of the speckle light beam, namely, the more the number of the speckle light beams in a certain area is, the smaller the area of a single light beam is, the more the data describing the deformation of the pattern is, the higher the precision of the data is, the higher the precision of the measurement result is, and the higher the precision of the device is. The speckle light beam is formed by the speckle pattern, so that the smaller the speckle in the speckle pattern, the more the number of the speckle spots in a certain area is, and the higher the precision of the device is. Because the current photolithography process can etch and form tens of thousands or even hundreds of thousands of speckle spots in micron level in a certain area, and the cost of the photolithography process is greatly reduced compared with a Digital Light Processing (DLP) chip, the photolithography technology can be used for etching any speckle pattern with the size meeting the requirement of the speckle projection device 100 on the precision on the slide 102, and the high cost is not needed, so that the speckle projection device 100 has high precision.
Further, in some embodiments, the material of the transparent substrate is white glass. Therefore, the projection sheet 102 formed by etching on the transparent substrate has high light transmittance because the white glass has high light transmittance, so that great loss of light beams when the light beams pass through the projection sheet 102 can be avoided, the brightness of light spots formed by speckle light beams projected onto an object to be detected is ensured, image light spots acquired by the imaging lens 103 are clearer, and subsequent analysis is facilitated. In addition, the cost of white glass is low, which is beneficial to reducing the cost of the speckle projection apparatus 100 while having high transmittance.
In other embodiments, the transparent substrate may also be made of an organic high polymer material, and the material of the transparent substrate is not limited in this application, and may be any material that can be subjected to photolithography and satisfies a certain light transmittance.
Further, in some embodiments, the size and number of the speckle patterns on the slide 102 are related to the imaging lens 103, and the selection of the imaging lens 103 is related to the application scenario of the speckle projection apparatus 100. Specifically, different application scenes may require that the lens has different resolving powers, diagonal angles of view and measurement accuracies, and for example, in high-accuracy application scenes such as industrial detection and machine vision, the lens for fixed-focus imaging is required to have a higher resolving power, and then the imaging lens 103 may be a C-aperture lens (C-Mount) with better quality; for example, in the application scenarios of safety protection such as living body detection and 3D behavior detection, the imaging lens 103 may be an M12 interface lens; if the terminal verifies the scene like the electronic consumption, etc., then the imaging lens 103 may be a M6 lens-adapted smaller target sensor (sensor); the size of the speckle pattern is generally the same as the size of 3-5 pixel points in the image imaged by the imaging lens 103, and the size of the pixel points actually represents the image resolution of the imaging lens 103.
It should be noted that the diagonal field angle generally required is 30 to 80 degrees, and the larger the diagonal field angle, the higher the measurement accuracy, and the higher the image resolution, so that the actual application scene of the speckle projection apparatus 100 determines the image resolution of the imaging lens 103, and indirectly determines the size of the speckle pattern of the slide 102. In addition, the ratio of the light-transmitting area to the non-light-transmitting area in the speckle pattern is 1: 2 or so, the required number of speckles of the speckle pattern of a certain size slide 102 can be determined.
It should be noted that, in some cases, the application scene directly requires the volume of the imaging lens 103, and for example, the speckle projection apparatus 100 used in the mobile phone requires the imaging lens to be small, and in this case, the problem of the volume is considered preferentially, so that it is necessary to select from lenses of different sizes, such as an industrial lens, an M12 lens, an M6 lens, and the like, according to the lens volume.
Further, in some embodiments, the light beam provided by the light source 101 may be an infrared light beam located in an infrared band, so that a certain stray light anti-interference capability can be ensured while the visual effect is not affected, that is, a high-quality light beam is provided.
Further, in consideration of small volume and high Light Emitting intensity of a Light Emitting Diode (LED) lamp, which is beneficial for miniaturization of the speckle projection apparatus, in some embodiments, the Light source 101 may be an LED lamp or an LED lamp array, where the lamp array is beneficial for further increasing the Light power.
In one example, the light source 101 may be an LED lamp that provides an infrared beam.
It should be noted that, in other embodiments, the light source 101 may also be other types of lighting devices, such as a laser light source, which is not described herein again.
Further, when the light source 101 is a lamp array formed by a plurality of lighting units, such as LEDs, the number and arrangement of the lighting units in the lamp array are related to the optical power requirement of the speckle projection apparatus 101. If the speckle projection apparatus 100 requires that the emergent light power of the light source 101 is R watt, the optical path transmission efficiency is η, the electric power of a single LED is p watts, and the photoelectric conversion efficiency is ζ, the required number of LEDs is: k ═ R (R/η)/(p xi), the LEDs can be arranged according to a circle or even ranks, then the corresponding collimating lenses are also arranged according to the LED positions, the situation of other lighting units is similar to the above distances, and is not repeated here.
Referring to fig. 2, the speckle projection apparatus 100 further includes, between the light source 101 and the slide 102: a collimation module 104 and a focusing module 105.
The collimating module 104 is located between the slide 102 and the focusing module 105, the collimating module 104 is configured to collimate the light beam before the light beam is projected onto the slide 102, and the focusing module 105 is configured to focus the collimated light beam before the light beam is projected onto the slide 102.
It should be noted that the structural schematic diagram of the speckle projection apparatus 100 shown in fig. 2 is a partially enlarged view of the light source 101, the collimating module 104, the focusing module 105 and the slide 103, and the imaging lens 103 is omitted and not shown, which does not mean that the imaging lens 103 is not present.
Further, in some embodiments, the collimating module 104 is a collimating lens or a collimating lens group, wherein the collimating lens group is a module comprising several collimating lenses. Thus, when the light source 101 is an LED lamp array or a lamp array formed by other lighting units, each lighting unit corresponds to one collimating lens in the collimating lens set, that is, each lighting unit emits a light beam, which is collimated by the corresponding collimating lens and becomes a parallel light beam, wherein the arrangement of the collimating module 104 is the same as the arrangement of the light source 101.
Further, in some embodiments, the focusing module 105 is a plano-convex spherical lens, wherein a focusing Angle of the plano-convex spherical lens is the same as a Chief Ray Angle (CRA) of the imaging lens 103, and a size of the plano-convex spherical lens is related to a minimum envelope circle of a lamp array (e.g., an LED lamp array) composed of the lighting units.
Specifically, referring to fig. 3, after the collimation is completed, a spherical lens with a focal length F being D/tan θ is selected to focus the LED array according to the minimum enveloping circle diameter D of the LED array and the incident angle requirement θ of the imaging lens.
It should be noted that different lenses have different CRAs, for example, the CRA angle of an industrial lens, an M12 lens is generally 15 degrees to 17 degrees, and the CRA angle of an M6 lens is generally 30 degrees to 33 degrees. The CRA of the lens affects the sharpness of the final image, so that the focusing angle of the plano-convex spherical lens is required to be the same as the CRA of the imaging lens 103 to ensure the sharpness of the image.
In particular, for better collimation, the light source 101 may be constructed with a lighting unit having a small divergence angle (half angle of divergence less than 15 degrees) to facilitate collimation.
Further, the distance between the slide 103 and the focusing module 105 (i.e., the plano-convex spherical lens) is related to the preset minimum envelope circle of the speckle pattern and the focusing angle of the focusing module 105 (i.e., the plano-convex spherical lens).
Specifically, referring to fig. 3, the projection film is placed at a position B/tan θ from the focal point t, according to the minimum enveloping circle diameter B of the projection area required on the projection film.
It should be noted that, in practical applications, the components of the speckle projection apparatus 100 according to this embodiment may be one physical unit, may be a part of one physical unit, or may be implemented by a combination of multiple physical units. In addition, in order to highlight the innovative part of the present invention, elements that are not so closely related to solving the technical problems proposed by the present invention are not introduced in the present embodiment, but this does not indicate that other elements are not present in the present embodiment.
An embodiment of the present invention further provides a method for manufacturing a speckle projection apparatus, and referring to fig. 4, the method includes:
Specifically, in some embodiments, referring to fig. 5, step 401 specifically includes:
And carrying out chrome plating on the light-transmitting substrate to form a chrome layer.
In one example, a transparent substrate is chrome plated to form a chrome layer, and specifically, a side of the transparent substrate is chrome plated to form a thin layer of chrome material, i.e., a chrome layer, overlying the transparent substrate. It should be noted that, in the above description, the light-shielding layer material is chromium, and other metals may be plated or other non-metallic materials may be used according to actual requirements.
And step 4012, etching the shading layer according to a preset speckle pattern.
In an example, the light-shielding layer is positioned on the chromium layer, the chromium layer is etched, so that a light-transmitting area is formed in an area where the chromium material is not etched, and a non-light-transmitting area is formed in the etched area, so as to obtain the projection sheet shown in fig. 6, a black part in fig. 6 is the non-light-transmitting area, a white part inside the black part is the light-transmitting area, wherein the peripheral frame is an outer contour of the light-transmitting substrate.
It should be noted that fig. 6 shows only one preset speckle pattern, the black area may also be a rectangle, and the spots may also be spread over the entire substrate, and so on, which is not described in detail herein.
And step 402, assembling the light source, the imaging lens and the slide to form the speckle projection device.
Specifically, the whole speckle projection device is assembled by designing corresponding structures according to the back intercept of the imaging lens, the distance between the light source and the imaging lens and the like.
The light source is used for providing a light beam projected on the slide; the projection film is used for filtering the light beam to form a speckle light beam, and the speckle light beam is used for projecting to an object to be measured; the imaging lens is used for acquiring an image when the speckle light beam is projected on the object to be measured.
It is obvious that the method for manufacturing the speckle projection apparatus provided by this embodiment is a method embodiment corresponding to the speckle projection apparatus provided by the foregoing embodiment, and this embodiment can be implemented in cooperation with the foregoing speckle projection apparatus. The related technical details mentioned in the foregoing embodiments of the speckle projection apparatus are still valid in this embodiment, and are not described herein again for the sake of reducing redundancy. Accordingly, the related art details mentioned in the present embodiment can also be applied to the embodiments of the speckle projection apparatus described above.
The embodiment of the application also provides electronic equipment, which comprises a speckle projection device; the device comprises a light source, a slide and an imaging lens, wherein the light source is used for providing a light beam projected onto the slide; the projection film is formed by photoetching a light-transmitting substrate according to a preset speckle pattern and is used for filtering light beams and forming speckle light beams which are used for projecting to an object to be measured; the imaging lens is used for acquiring an image when the speckle light beam is projected on the object to be measured.
It should be noted that, in the electronic device, the speckle projection apparatus is generally combined with a data processing module in the electronic device to form a structured light or binocular 3D measurement system, where the data processing module is configured to analyze an image obtained by the speckle projection apparatus when the object mountain to be measured is projected with a speckle beam to obtain information such as depth, and for example, the image obtained by projecting the object mountain with the speckle beam and a reference plane speckle image calibrated and stored in advance may be subjected to matching comparison operation to obtain an offset of a corresponding characteristic pixel point between the two images, and then depth value information of the corresponding characteristic pixel point in an actual scene is derived according to the offset.
It should be further noted that the electronic device including the speckle projection apparatus can be applied to and monitor scenes, so that actions and behaviors of a human body can be accurately monitored, for example, a 3D face is snapshotted to perform face recognition to pay or unlock, and a 3D environment is monitored to avoid 2D image interference; the method can also be applied to industrial measurement scenes, so that the research and development speed and precision of structured light measurement products can be improved, and the cost is reduced.
In fact, the speckle projection apparatus included in the electronic device provided in the embodiment of the present application is the same as the speckle projection apparatuses provided in other embodiments, and therefore, the electronic device provided in this embodiment also has the same technical effect as the speckle projection apparatuses provided in other embodiments, which is not described herein again.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (10)
1. A speckle projection apparatus, comprising: a light source, a projection film and an imaging lens,
the light source is used for providing a light beam projected on the slide;
the projection film is formed by photoetching on a light-transmitting substrate according to a preset speckle pattern and is used for filtering the light beam to form a speckle light beam, and the speckle light beam is used for projecting to an object to be measured;
the imaging lens is used for acquiring an image when the speckle beam is projected on the object to be measured.
2. The speckle projection apparatus as claimed in claim 1, wherein the transparent substrate is made of white glass.
3. The speckle projection apparatus of claim 1 or 2, wherein the size and number of the speckles in the predetermined speckle pattern is related to the image resolution of the imaging lens, wherein the imaging lens is related to the application scene of the speckle projection apparatus.
4. The speckle projection apparatus as claimed in claim 1 or 2, further comprising: the collimating module is located between the projection film and the focusing module, the collimating module is used for collimating the light beam before the light beam is projected onto the projection film, and the focusing module is used for focusing the collimated light beam before the light beam is projected onto the projection film.
5. The speckle projection apparatus as claimed in claim 4, wherein the collimating module comprises a collimating lens group, the light source is an LED array, each LED in the LED array corresponds to one collimating lens in the collimating lens group, and the number and arrangement of the LED in the LED array are related to the optical power requirement of the speckle projection apparatus.
6. The speckle projection apparatus as claimed in claim 4, wherein the focusing module is a plano-convex spherical lens, the light source is a Light Emitting Diode (LED) lamp array, the focusing angle of the plano-convex spherical lens is the same as the chief ray angle of the imaging lens, and the size of the plano-convex spherical lens is related to the minimum enveloping circle of the LED lamp array.
7. The speckle projection arrangement of claim 6, wherein the distance between the slide and the plano-convex spherical lens is related to the minimum envelope circle of the predetermined speckle pattern and the focusing angle of the plano-convex spherical lens.
8. A method of making a speckle projection apparatus, comprising:
photoetching is carried out on the light-transmitting substrate according to a preset speckle pattern to form a projection film;
assembling a light source, an imaging lens and the projection film to form a speckle projection device;
wherein the light source is used for providing a light beam projected on the slide; the projection film is used for filtering the light beam to form a speckle light beam, and the speckle light beam is used for projecting to an object to be measured; the imaging lens is used for acquiring an image when the speckle beam is projected on the object to be measured.
9. The method of claim 8, wherein the step of performing photolithography on the transparent substrate according to the predetermined speckle pattern comprises:
forming a light-shielding layer on one surface of the light-transmitting substrate by using a light-shielding material;
and etching the shading layer according to the preset speckle pattern.
10. An electronic device, comprising: the speckle projection apparatus of any of claims 1-7.
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