CN109839792B - Structured light projection device with coded light, electronic device and application thereof - Google Patents
Structured light projection device with coded light, electronic device and application thereof Download PDFInfo
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- 238000012545 processing Methods 0.000 description 8
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Abstract
The structured light projection device with the coded light comprises a laser transmitter, a photomask, a collimating lens system and a diffraction optical element, wherein the light rays emitted by the laser transmitter form a fixed pattern through the photomask, are collimated after passing through the collimating lens system, and are projected to the space target after being diffused in an auxiliary mode through the diffraction optical element.
Description
Technical Field
The present invention relates to the field of photographing electronic devices, and more particularly, to a structured light projection apparatus having coded light, an electronic device, and applications thereof, and further, to a coded structured light projection apparatus for generating a fixed pattern by generating coded light, an electronic device, and applications thereof.
Background
With the development of technology, photographic electronic devices are also becoming popular, and naturally, the requirements of the photographic electronic devices are also becoming higher. For the photographing device, such as the depth camera, can acquire the depth information of the target, and can realize the functions of 3D scanning, imaging or modeling, etc., therefore, the depth camera is gradually applied to a large number of photographing electronic devices, so that the photographing electronic devices are added with more functions, and better experience is brought to people.
The quality of projection of the structured light projection device, which is one of the important components of the depth camera, directly affects the imaging quality of the depth camera. In the prior art, a structured light projection device of a depth camera generally adopts a light source to form an irregular pattern and project the irregular pattern to a space target, and then a collection module receives reflected light and generates a required image through a processor. However, since the common structured light is formed by an irregular pattern on the light source arrangement, and parallel light is formed by the collimator lens and copied and diffused on the diffractive optical element DOE, the diffractive structured light projection module is finally formed. In addition, the light source design often adopts simple light spots, so the light source design is also called a speckle structure light module. Because the difference between the light spots is very small, the light spots are generally only different in size, density and position, so that the recognition of the pattern received by the acquisition module is difficult.
In general, in order to ensure that the emitted structured light can accurately collect the information of the feature point a of the space object, the structured light of an irregular pattern is formed by adopting any combination of surface light, line light or point light, so as to capture the information of the feature point a of the space object, therefore, the distinguishing points between the light spots are very small due to the irregular pattern of the same light spot generated by the light source, and the structured light can not be completely identified, so that the information of some feature points a can not be obtained or the information of the feature points a is not obtained comprehensively, and the photographic quality is further affected.
For example, in the conventional speckle light projection device, an irregular light beam emitted by a laser emitter is collimated by at least one collimating lens, then is split and diffracted by a Diffractive Optical Element (DOE) to form a plurality of copied irregular patterns, and is irradiated to a space target to collect characteristic information of the space target, so that the structured light emitted by the speckle light projection device is an irregularly arranged irregular pattern based on the same light spot, and errors may occur along with the limitation of environment or self equipment capacity during calibration, and further, certain characteristic point depth information of the space target cannot be accurately obtained, thereby affecting the photographic quality.
In addition, due to the irregularity of the speckle structure light, when a plurality of light beams are formed through beam splitting and diffraction actions of the diffraction optical element, boundary areas between each light beam cannot be distinguished, and therefore when the characteristic information of a space target is acquired, corresponding characteristic information cannot be identified, and imaging quality is further affected.
In general, in order to ensure that the characteristic point information of the space object can be obtained as comprehensively as possible, the conventional structured light projection device needs to set more light sources to emit as many light beams as possible to be projected to the space object, so that a large amount of light source energy is consumed, the abrasion rate is increased, the imaging effect is affected, and the service life of the device is reduced.
Disclosure of Invention
An object of the present invention is to provide a structured light projection apparatus, an electronic device, and an application thereof, which can form a fixed pattern of structured light to be projected onto a surface of a space object, thereby better identifying depth information of the space object, reducing calibration errors, and improving identification accuracy, so as to ensure three-dimensional imaging quality.
Another object of the present invention is to provide a structured light projection apparatus, an electronic device, and an application thereof, in which the structured light projection apparatus, the electronic device, and the application thereof are configured such that the structured light is projected onto a space object by emitting the structured light from a laser light source having a structured pattern, collimating the structured light by a collimator, and DOE copying and diffusing the structured light to form a fixed pattern.
Another object of the present invention is to provide a structured light projection apparatus, an electronic device, and an application thereof, which have coded light, wherein the coded light is formed by a photomask by emitting a light beam from a surface light source, and is collimated by a collimator lens, and the DOE is replicated and diffused, so that the coded structured light with a fixed pattern is projected onto a space object.
Another object of the present invention is to provide a structured light projection apparatus, an electronic device, and an application thereof, which have no influence on the fixed pattern of the encoded structured light due to environmental changes or self-equipment factors, and no error is generated, so as to ensure the stability of the projection quality.
Another object of the present invention is to provide a structured light projection device, an electronic apparatus and an application thereof, wherein the photomask has a light-transmitting region so that the light beam passes through the photomask to form various patterns of coded light.
Another object of the present invention is to provide a structured light projection device with coded light, an electronic apparatus and applications thereof.
Another object of the present invention is to provide a structured light projection apparatus with coded light, an electronic device and an application thereof, wherein the structured light projection apparatus can reduce energy consumption of a light source, reduce wear rate of the device, and increase service life.
Another object of the present invention is to provide a structured light projection device with coded light, an electronic device and an application thereof, which have simple structure, high practicality and low cost.
According to one aspect of the present invention, there is further provided a structured light projection apparatus with coded light for projection onto a spatial target, comprising: the device comprises a laser transmitter, a photomask, a collimating lens system and a diffraction optical element, wherein light rays emitted by the laser transmitter form a fixed pattern through the photomask, are collimated after passing through the collimating lens system, and are projected to the space target after being copied and diffused through the diffraction optical element.
In some embodiments, the collimating lens system is located between the photomask and the diffractive optical element.
In some embodiments, the photomask comprises a transparent substrate and an opaque layer arranged on the substrate, the opaque layer forms a plurality of light transmission areas through an etching process, and the light beam emitted by the laser emitter passes through the plurality of light transmission areas to form the fixed pattern.
In some embodiments, the light passing aperture of the laser emitter emits light toward the light passing region of the photomask.
In some embodiments, it further comprises a structural support, wherein the structural support has a channel, wherein the laser transmitter, the photomask, the collimator system, and the diffractive optical element are mounted in sequence to the channel.
In some embodiments, it further comprises a wiring board, wherein the wiring board is electrically connected to the laser transmitter.
According to another aspect of the present invention, there is provided a structured light projection apparatus with coded light for projecting a spatial target, comprising:
A coded light source;
A collimator lens system; and
The coded light source emits coded light with a coded pattern, the coded light is collimated by the collimating lens, and the coded light is copied and diffused by the diffractive optical element and then projected to the space target.
In some embodiments, the collimating lens system is located between the coded light source and the diffractive optical element.
According to another aspect of the present invention, there is provided a camera module having a structured light projection device for encoding light, comprising: the structured light projection device comprises a collection module and the structured light projection device, wherein the structured light projection device containing the photomask projects coded structured light with a fixed pattern to the surface of the space target and is received by the collection module after being reflected.
According to another aspect of the present invention, there is provided an electronic apparatus for photographing a space object, comprising: an apparatus body and one or more of the above camera modules, wherein the camera module is operatively mounted to the apparatus body for photographing the spatial object.
According to another aspect of the present invention, there is also provided a method of generating structured light, comprising the steps of: light emitted by a laser emitter is formed into a fixed pattern through a photomask, collimated through a collimating lens system, and replicated and diffused through a diffractive optical element to form a coded structured light.
In some embodiments, the photomask comprises a transparent substrate and an opaque layer arranged on the substrate, the opaque layer forms a plurality of light transmission areas through an etching process, and the light beam emitted by the laser emitter passes through the plurality of light transmission areas to form the fixed pattern.
According to another aspect of the present invention, there is also provided a method of generating structured light, comprising the steps of: coded light with a fixed pattern is emitted by a coded light source, collimated by a collimating lens system, and replicated and diffused by a diffractive optical element to form a coded structured light.
Drawings
Fig. 1 is a schematic structural view of a structured light projection apparatus provided with coded light according to a preferred embodiment of the present invention.
Fig. 2A is a schematic view of a part of a structure of a structured light projection apparatus provided with coded light according to a preferred embodiment of the present invention.
Fig. 2B is a partial schematic view of a structured light projection apparatus with coded light according to a preferred embodiment of the present invention.
Fig. 3 is a partial schematic view of a structured light projection apparatus provided with coded light according to a preferred embodiment of the present invention.
Fig. 4 is a partial schematic view of a structured light projection apparatus provided with coded light according to a preferred embodiment of the present invention.
Fig. 5 is a partial schematic view of a structured light projection apparatus provided with coded light according to a preferred embodiment of the present invention.
Fig. 6 is a schematic structural view of an electronic device provided with a structured light projection means of coded light according to a preferred embodiment of the present invention.
Fig. 7 is a schematic structural view of a structured light projection apparatus provided with coded light according to a first modified embodiment of the present invention.
Detailed Description
The following description is presented to enable one of ordinary skill in the art to make and use the invention. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be appreciated by those skilled in the art that in the present disclosure, the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. refer to an orientation or positional relationship based on that shown in the drawings, which is merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore the above terms should not be construed as limiting the present invention.
It will be understood that the terms "a" and "an" should be interpreted as referring to "at least one" or "one or more," i.e., in one embodiment, the number of elements may be one, while in another embodiment, the number of elements may be plural, and the term "a" should not be interpreted as limiting the number.
According to the conception of the invention, the structured light projection device with the coded light, the electronic equipment and the application thereof are provided, the coded structured light with a fixed pattern can be formed and projected on the surface of a space target, so that the depth information of the space target can be better acquired, and the accuracy and the standard can be further improved, and the three-dimensional projection quality can be ensured.
The structured light projection apparatus 100 with coded light according to the preferred embodiment of the present invention as shown in fig. 1, 2A and 2B is provided for a camera module to acquire depth information of a spatial target, wherein the structured light projection apparatus 100 with coded light includes a laser emitter 10, a photomask 20, a collimating mirror system 30 and a diffractive optical element 40, wherein light rays 11 emitted from the laser emitter 10 form a fixed pattern through the photomask 20, are collimated through the collimating lens system 30, and are projected onto the spatial target after being replicated and diffused through the diffractive optical element 40 to complete the projection. That is, the light 11 emitted by the laser emitter 10 passes through the photomask 20 to form coded light with a fixed pattern, and then the coded light is collimated by the collimating system 30 and replicated and diffused by the diffractive optical element 40 to form coded structured light with a specific fixed pattern, and then the coded structured light is projected to the space target, so as to obtain depth information of the space target. Preferably, the fixed pattern shape enables the camera module to more precisely acquire depth information of the spatial target to improve quality of three-dimensional projection.
It should be noted that the collimator lens system 30 is located between the photomask 20 and the diffractive optical element 40, so as to ensure that the light emitted by the laser emitter 10 can sequentially pass through the photomask 20, the collimator lens system 30 and the diffractive optical element 40.
In this embodiment, the laser transmitter 10 emits the light 11 and forms an initial light path 111, wherein the photomask 20 is disposed in a light path direction of the initial light path 111, so that the initial light path 111 passes through the photomask 20 and forms the coded light 112 having the fixed pattern, that is, a cross section of the coded light 112 is the fixed pattern. That is, the light in the initial light path 111 can be irradiated on the photomask 20 in front, and the coded light 112 having a fixed pattern is formed through the photomask 20. Preferably, the photomask 20 is capable of completely receiving the light in the initial light path 111 to prevent the initial light path 111 from leaking out of the side of the photomask 20, and the coded light 112 is formed by the light in the initial light path 111 passing through the photomask 20, so as to ensure that the shape of the fixed pattern is a fixed shape. Preferably, the shape of the fixed pattern enables the receiving module of the camera module to more accurately identify the structural light reflected by the surface of the space object, so that the depth information of the space object can be better acquired to acquire the characteristic point information of the space object. As shown in fig. 3, the photomask 20 has a pattern region, wherein the pattern region is composed of a plurality of opaque regions 231 and a plurality of transparent regions 232, wherein the opaque regions 231 prevent the light beam 11 from passing therethrough, wherein the transparent regions 232 allow the light beam 11 to pass therethrough. The initial light path 111 passes through the light-transmitting region 232 of the photomask 20 and forms the coded light 112, wherein the shape of the fixed pattern is similar to the shape of the light-transmitting region 232, wherein the shape of the light-transmitting region 232 can be a combination of one or more sets of cross, circle, square, etc., and further the shape of the cross section of the coded light 112 can be defined by the shape structure of the pattern region of the photomask 20, thereby ensuring that the coded light 112 has a fixed shape.
Preferably, the laser transmitter 10 has a plurality of laser light sources, preferably surface light sources, to emit a set of the light beams 11 to form the initial light path 111.
It should be noted that, each light source has a light-passing hole to emit the light, i.e. the positions of the light-passing holes of the light sources can be arranged according to the shape of the light-transmitting region 232 of the photomask 20. In other words, the position of the light-passing hole of the light source corresponds to the shape of the light-transmitting region 232 of the photomask 20, so that the light emitted from the light-passing hole of the laser emitter 10 can be irradiated to the light-transmitting region 232 along a straight line, thereby reducing the irradiation of the light to the light-opaque region 231 to reduce the consumption of light energy. At the same time, the number of light sources of the laser transmitter 10 is reduced, the energy consumption of the light sources is reduced, the equipment wear rate is reduced, and the service life is prolonged.
It should be noted that the light can also be a light beam generated by a laser emitter array formed by a plurality of laser emitters 10 to accommodate more demands.
It can be seen that the fixed pattern of the coded light 112 always coincides with the shape of the light-transmitting region 232 of the photomask 20, and the shape of the light-transmitting region 232 of the photomask 20 can be designed according to the requirements; and the material of the photomask 20 is stable, so that the structured light projection apparatus 100 does not affect the fixed pattern of the encoded structured light along with the environmental change or the self-equipment reason, and further no error is generated, so as to ensure the stability of the projection quality.
In this embodiment, the photomask 20 includes a substrate 21 and an opaque layer 22, wherein the substrate 21 is disposed in the optical path of the initial optical path 111, and wherein the substrate 21 is made of a light-transmitting material, preferably high purity, low reflectivity, low coefficient of thermal expansion quartz glass. The light-impermeable layer 22 is arranged on the substrate 21 and forms the light-impermeable areas 231 of the pattern area to prevent the light beam 11 from passing through, wherein the light-impermeable layer 22 has a fixed shape and leaves the light-permeable areas 232 for the light beam 11 to pass through the light-permeable areas 232 to form the coded light 112. That is, the coded light 112 is formed by disposing the light-impermeable layer 22 on the substrate 21 to form the pattern region, and then passing the initial light path 111 through the pattern region.
It should be noted that the opaque layer 22 can be manually disposed on the substrate 21, that is, the opaque layer 22 can be configured into patterns with different structural shapes, so that the shape structure of the pattern area can be manually set, and then the shape of the fixed pattern, that is, the shape structure of the cross section of the coded light 112 can be controlled, so as to ensure that the shape of the fixed pattern is fixed, and then the coded structured light can be projected to the space object in the form of the fixed pattern, so as to increase the recognition accuracy.
Preferably, the opaque layer 22 is etched by a process means such as etching to form the light-transmitting region 232 having the pattern region with a fixed pattern, so as to obtain a fixed pattern corresponding to the feature point of the space object, wherein the initial light path 111 can pass through the light-transmitting region 232 formed by etching, but cannot pass through the opaque region 231 not etched, so as to form the fixed light beam 112 having the fixed pattern. Typically, the minimum line width of the fixed pattern formed by etching means is distributed between 2-5um, and each light-transmitting region 232 may be C-shaped, cross-shaped, triangular, etc. shape or one or more combinations thereof. It should be noted that, the current etching technology is quite mature and has low error, so that the precision of the fixed pattern of the photomask 20 is high, and further, the precision of the fixed pattern of the coded light 112 is also high, so that the size and shape of the fixed pattern can be ensured to meet the design requirement, so that the pattern formed by the coded structured light reflected by the space object received by the camera module can be more accurately identified, and further, the precision of acquiring the feature information of the space object is improved, so as to improve the three-dimensional imaging quality.
In addition, the thermal expansion coefficient of the photomask 20 is low, so that thermal deformation is not easy to occur, and the stability is high. That is, the size and shape of the pattern area are relatively stable, so that the stability of the fixed pattern is ensured, the shape of the fixed pattern is prevented from being changed due to thermal deformation, the stability of the coded structured light is further ensured, the stability of the reflected light when the space target is projected is ensured, and the camera module is further ensured to accurately identify the depth information of the space target.
The collimator lens system 30 is disposed in the optical path of the coded light 112, wherein the light rays in the coded light 112 pass through the collimator lens system 30 and are collimated by the collimator lens system 30 and form a collimated optical path 113. That is, the collimator lens system 30 collimates only the coded light 112 without affecting the shape of the fixed pattern, thereby ensuring that the shape of the fixed pattern remains stable.
In this embodiment, the collimator lens system 30 is a single collimator lens, that is, only a single collimator lens is needed for the structured light projection apparatus 100 to collimate the light beam 11, so as to further satisfy the needs of people.
It is noted that the collimator lens system 30 can be implemented as two collimator lenses or even more, as shown in fig. 4 and 5. It should be understood that the number of the collimating lenses of the collimating lens system 30 is not limited to the present invention, and only needs to satisfy the collimating effect.
The diffractive optical element 40 is disposed in the optical path of the collimating optical path 113, where the light in the collimating optical path 113 passes through the diffractive optical element 40 and is split and diffracted by the diffractive optical element 40 to form a plurality of encoded structured lights 1141 with similar shapes by replication and diffusion, and forms a diffractive optical path 114. That is, the spatial target is in the diffraction optical path 114 for the coded structured light to be projected onto the surface of the spatial target. Therefore, when the coded structured light 1141 with the fixed pattern irradiates the surface of the space object, a reflected light with a fixed shape is generated, and when the camera module receives the reflected light, the depth information of the space object can be more accurately identified, so as to ensure the three-dimensional projection quality. Compared with the traditional speckle structure light projection device, the fixed pattern coding structure light enables the reflected light to be recognized by the camera module more accurately, and therefore three-dimensional projection quality is more accurate.
In this embodiment, the diffractive optical element 40 is a type of optical lens, i.e., DOE, that has the effect of replicating a diffuse beam.
It should be noted that the coded structured light 1141 of the diffraction light path 114 is emitted in a diffuse manner to cover the spatial target as much as possible, and since the coded structured light 1141 is replicated into a plurality, it is ensured that the feature points of the spatial target can be projected and identified by the coded structured light 1141. That is, when the spatial target is in the diffraction optical path 114, the feature points of the spatial target can be correspondingly projected by at least one of the coded structured lights 1141, so as to prevent the information of the feature points of the spatial target from not being collected, thereby preventing the photographic quality from being affected.
Therefore, since the encoded structured light 1141 is replicated by the diffractive optical element 40 to form a plurality of encoded structured lights, the number of laser light sources can be reduced relatively, and the power consumption of the laser emitter 10 can be reduced, so as to save more energy. Compared with the traditional speckle structure light, the structure light projection device with the coded light can project the space target by adopting the coded structure light 1141 with the fixed pattern, so that the calibration effect is better, and the pattern recognition is more accurate.
It is noted that there is a boundary region between the coded structured light 1141 in each adjacent diffraction optical path 114, wherein the shape of the boundary region is similar to the pattern of the fixed pattern boundary, thereby enabling the shape of the boundary region to be distinguished. That is, when the feature point information of the spatial target is collected, the boundary region between the encoded structured lights 1141 can be easily identified, so as to ensure that the feature point information of the spatial target can be accurately identified, thereby ensuring the imaging quality. Compared with the structured light of the irregular pattern of the traditional speckle light projection device, the method has the advantages that the characteristics between the boundaries of adjacent structured light cannot be accurately distinguished, and further, the error collection of the characteristic point information is greatly caused, so that the imaging quality is affected.
In this embodiment, the structured light projection apparatus 100 further comprises a structural support 50, wherein the structural support 50 has a channel, wherein the laser emitter 10, the photomask 20, the collimating mirror system 30 and the diffractive optical element 40 are sequentially and longitudinally mounted in the channel, and wherein the diffractive light path 114 is emitted from the channel to impinge on the surface of the spatial target.
The structured light projection apparatus 100 with coded light further comprises a circuit board 60, wherein the circuit board 60 is electrically connected to the laser transmitter 10 for controlling the laser transmitter 10 to emit the light beam 11, wherein the circuit board 60 is mounted on the bottom side of the channel. Preferably, the circuit board 60 cooperates with the structural support 50 to close the bottom side of the channel to prevent ambient light from interfering with the light beam 11.
As shown in fig. 6, the camera module and the electronic device of the structured light projection apparatus 100 with coded light, wherein the camera module of the structured light projection apparatus 100 with coded light comprises an acquisition module 200, a processing module 300 and the structured light projection apparatus 100 with coded light, wherein the structured light projection apparatus with coded light projects the coded structured light with a fixed pattern onto a surface 401 of the spatial object 400 and reflects a reflected light beam, wherein the reflected light beam is received by the acquisition module, wherein the acquisition module is communicatively connected to the processing module for the processing module to generate a corresponding image.
The electronic device with the camera module of the coded light structured light projection apparatus 100 comprises a device main body and one or more camera modules of the coded light structured light projection apparatus 100, wherein the camera module of the coded light structured light projection apparatus 100 is operatively mounted on the device main body, so that the camera module of the coded light structured light projection apparatus 100 generates a corresponding image to be displayed on the device main body, so as to meet the shooting requirement of people. It is understood that the processing module may be integrated with the control motherboard of the device body.
The method for generating coded structured light by the structured light projection device 100 with coded light comprises the following steps: the light emitted by the laser emitter 10 is passed through the photomask 20 to form the coded light 112 with a fixed pattern, collimated by the collimating lens system 30, and split by the diffractive optical element 40 to form the coded structured light 1141 for projection onto the spatial target.
As shown in fig. 7, the first modified embodiment of the structured light projection apparatus with coded light according to the present invention is different from the preferred embodiment of the present invention in that the structured light projection apparatus with coded light 100A includes a coded light source 10A, a collimating mirror system 30 and a diffractive optical element 40, wherein the coded light source 10A emits the coded light 11A with a coded pattern, is collimated by the collimating mirror system 30, and is projected onto the space object after being duplicated and diffused by the diffractive optical element 40, so as to complete three-dimensional projection. In other words, the coded light source 10A emits the coded light 11A, which is then collimated by the collimator lens system 30, replicated and diffused by the diffractive optical element 40 to form the coded structured light 12A in a fixed pattern for projection onto the spatial target. Preferably, the shape of the fixed pattern of the coded structured light 12A is designed manually, so as to be able to be accurately identified, thereby obtaining the characteristic point information of the space object and ensuring the three-dimensional projection quality.
In the present embodiment, the collimator lens system 30 is located between the coded light source 10A and the diffractive optical element 40, so that the coded light 11A emitted from the coded light source 10A can sequentially pass through the collimator lens system 30 and the diffractive optical element 40 to form the coded structured light.
It should be noted that the coded light source 10A is a light source with a coded pattern, such as a light source with a pattern arrangement formed by combining a cross, a triangle, a circle, or the like. That is, the coding pattern of the coding light source 10A is fixed, so that the coding structure light 12A with the fixed pattern can be easily identified, and the generated reflected light is also in a fixed shape when the coding structure light irradiates the space object, so that the camera module can easily identify the depth information of the space object according to the received reflected light, and further the projection quality is improved.
In this embodiment, the structured-light projection apparatus 100A with coded light further comprises a structural support 50, wherein the structural support 50 has a channel, wherein the coded light source 10A, the collimating mirror system 30 and the diffractive optical element 40 are sequentially and longitudinally mounted in the channel, and wherein the coded structured light 12A is emitted from the channel to be irradiated to the surface of the spatial target.
The structured light projection apparatus 100A with coded light further comprises a circuit board 60, wherein the circuit board 60 is electrically connected to the coded light source 10A to control the coded light source 10A to emit the coded light 11A, wherein the circuit board 60 is mounted on the bottom side of the channel. Preferably, the circuit board 60 cooperates with the structural support 50 to close the bottom side of the channel to prevent ambient light from interfering with the coded light 11A.
The method for generating coded structured light by the structured light projection device 100A with coded light comprises the following steps: the coded light 11A with the fixed pattern is emitted by the coded light source 10A, collimated by the collimating lens system 30, and split by the diffractive optical element 40 to form the coded structured light 12A for projection onto the spatial target.
It will be appreciated that the camera module and the electronic device of the structured light projection apparatus 100A with coded light, wherein the camera module of the structured light projection apparatus 100 with coded light comprises an acquisition module 200, a processing module 300 and the structured light projection apparatus 100A with coded light, wherein the structured light projection apparatus with coded light projects the coded structured light 12A with a fixed pattern onto a surface of the spatial object and reflects a reflected light beam, wherein the reflected light beam is received by the acquisition module, wherein the acquisition module 200 is communicatively connected to the processing module 300 for the processing module 300 to generate a corresponding image.
The electronic device with the camera module of the coded light structured light projection apparatus 100A includes a device main body and one or more camera modules of the coded light structured light projection apparatus 100, wherein the camera module of the coded light structured light projection apparatus 100 is operatively mounted on the device main body, so that the camera module of the coded light structured light projection apparatus 100 generates a corresponding image to be displayed on the device main body, so as to meet the shooting requirement of people. It is understood that the processing module may be integrated with the control motherboard of the device body.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are by way of example only and are not limiting. The objects of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been shown and described in the examples and embodiments of the invention may be modified or practiced without departing from the principles described.
Claims (14)
1. A structured light projection apparatus for projecting onto a spatial target, comprising: a laser transmitter, a photomask, a collimating lens system and a diffraction optical element, wherein the laser transmitter emits light and forms an initial light path, and the initial light path forms coded light with a fixed pattern through the photomask, is collimated after passing through the collimating lens system and is projected to the space target after being diffused by the diffraction optical element in an auxiliary way;
The photomask is provided with a pattern area, wherein the pattern area is composed of a plurality of opaque areas and a plurality of transparent areas, the opaque areas prevent the initial light path from passing, the transparent areas allow the initial light path to pass, and the fixed pattern of the coded light always accords with the shape of the transparent areas of the photomask.
2. The structured light projection apparatus of claim 1 wherein said collimating lens system is positioned between said photomask and said diffractive optical element.
3. The structured light projection apparatus of claim 1 wherein said photomask comprises a transparent substrate and an opaque layer disposed on said substrate, said opaque layer forming a plurality of light transmitting areas by an etching process, said laser emitter emitting a beam of light through said plurality of light transmitting areas to form said fixed pattern.
4. A structured light projection apparatus according to claim 3 wherein a light passing aperture of said laser emitter emitting light is opposite said light passing region of said photomask.
5. The structured light projection apparatus of any one of claims 1 to 4 further comprising a structural support, wherein said structural support has a channel, wherein said laser emitter, said photomask, said collimating lens system, and said diffractive optical element are mounted in sequence in said channel.
6. The structured light projection apparatus of any one of claims 1 to 4 further comprising a wiring board, wherein said wiring board is electrically connected to said laser transmitter.
7. The structured light projection apparatus of claim 5 further comprising a circuit board, wherein said circuit board is electrically connected to said laser transmitter and said circuit board is positioned on the bottom side of said channel.
8. A structured light projection apparatus for projecting a spatial target, comprising: the coded light source emits coded light with a coded pattern, is collimated by the collimating lens system, and is projected to the space target after being copied and diffused by the diffraction optical element;
The coded light source is a light source with a fixed coded pattern, wherein the coded light source comprises a light transmission area, the light transmission area is used for enabling light rays of the coded light source to pass through to form the coded light, and the coded pattern of the coded light is consistent with the shape of the light transmission area of the coded light source all the time.
9. The structured light projection apparatus of claim 8 wherein said collimating lens system is positioned between said coded light source and said diffractive optical element.
10. A camera module of a structured light projection apparatus, comprising: a collection module and a structured light projection apparatus according to any one of claims 1 to 9, wherein the structured light projection apparatus projects coded structured light having a fixed pattern onto a surface of the spatial target and is received by the collection module after being reflected.
11. An electronic device for photographing a spatial object, comprising: a device body and one or more camera modules according to claim 10, wherein the camera module is operatively mounted to the device body for photographing the spatial target.
12. A method of generating structured light, comprising the steps of: emitting light rays through a laser emitter and forming an initial light path, wherein the initial light path forms coded light with a fixed pattern through a photomask, is collimated after passing through a collimating lens system, and forms coded structure light after being copied and diffused through a diffraction optical element;
The photomask is provided with a pattern area, wherein the pattern area is composed of a plurality of opaque areas and a plurality of transparent areas, the opaque areas prevent the initial light path from passing, the transparent areas allow the initial light path to pass, and the fixed pattern of the coded light always accords with the shape of the transparent areas of the photomask.
13. The method of claim 12, wherein the photomask comprises a transparent substrate and an opaque layer disposed on the substrate, the opaque layer forming a plurality of light-transmitting regions through an etching process, the laser emitter emitting a beam of light that passes through the plurality of light-transmitting regions to form the fixed pattern.
14. A method of generating structured light, comprising the steps of: the coded light with the coded pattern emitted by a coded light source is collimated by a collimating lens system and is duplicated and diffused by a diffraction optical element to form coded structured light;
The coded light source is a light source with a fixed coded pattern, wherein the coded light source comprises a light transmission area, the light transmission area is used for enabling light rays of the coded light source to pass through to form the coded light, and the coded pattern of the coded light is consistent with the shape of the light transmission area of the coded light source all the time.
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| CN110806672B (en) * | 2020-01-07 | 2020-05-22 | 南昌欧菲生物识别技术有限公司 | Projection module, recognition device and mobile terminal |
| WO2021170222A1 (en) * | 2020-02-25 | 2021-09-02 | Huawei Technologies Co., Ltd. | Depth estimation system for an electronic device |
| CN111443497B (en) * | 2020-05-13 | 2023-11-28 | 东莞埃科思科技有限公司 | Laser projection module, depth imaging device and method for selecting conversion lens |
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