Linear array scanning device capable of eliminating laser speckles

Abstract

The utility model relates to a linear array scanning device capable of eliminating laser speckles. The linear array scanning device comprises a driving circuit board, a driving motor, a camera processor, a camera lens, a laser, a laser lens, an aviation plug and a shell. The driving circuit board controls the laser to emit laser and transmits the laser to the laser lens through the optical fiber, light path shaping is carried out in the laser lens, a laser spot is shaped into a linear light spot to be emitted to a to-be-detected object, and the driving motor can drive the laser lens to reciprocate through power supply and control of the driving circuit board in the process. The camera lens shoots laser spots on an object to be measured and projects the laser spots to the camera processor, vibration of the laser lens enables the laser spots collected in a collection period of the camera to be in multiple positions, and laser spot energy and light beams are superposed, so that the fixed phase difference generated by the camera is eliminated, and the purpose of image denoising is achieved.

Description

Technical Field

[0001] The present application relates to the field of machine vision, and in particular to a linear array scanning device capable of eliminating laser speckle. Background Art

[0002] With the development of rail transit technology, relevant departments have paid more and more attention to the safety supervision of trains and vehicles. At present, in order to ensure the high-speed acquisition of train operation images, laser linear array scanning imaging modules are often used to identify the surface of the vehicle body. Lasers have good directionality and high energy, which can better fill in the light of high-speed moving objects. With high-speed linear array cameras, through the relative movement of the train and the trackside module, real-time appearance image acquisition of the train can be achieved. Combined with algorithm analysis, the state of the train surface can be determined, and abnormal conditions can be warned in time, which greatly improves the safety of railway operation.

[0003] For existing laser linear array scanning imaging modules, the high-speed environment of rail transit will limit the camera exposure time. When used on the trackside, in order to ensure operational safety, the trackside equipment has a long distance to shoot objects, so only laser equipment can be used for fill light. Since lasers have a high degree of coherence, there will be a fixed phase difference on the surface of objects, thus forming interference. When the camera shoots interference, irregular shot noise will appear. Due to the irregular nature of the noise, the algorithm processing is difficult and the image resolution is reduced. Utility Model Content

[0004] In view of this, the present application proposes a linear array scanning device that can eliminate laser speckle, eliminate camera interference, avoid the generation of shot noise, and achieve the effect of image denoising.

[0005] According to one aspect of the present application, a linear array scanning device capable of eliminating laser speckle is provided, comprising: a driving circuit board, a driving motor, a camera processor, a camera lens, a laser, a laser lens, an aerial plug and a housing.

[0006] The shell is a shell structure with a hollow interior, and a visible window is provided on the front side of the shell, and the driving circuit board, the driving motor, the camera processor, the camera lens, the laser and the laser lens are all arranged in the shell; the driving circuit board is connected to the aerial plug wire; the driving circuit board is connected to the camera processor wire, the camera processor is connected to the aerial plug network cable, the camera lens is arranged on the front side of the camera processor and is arranged corresponding to the visible window; the driving circuit board is connected to the laser wire, the laser is connected to the laser lens optical fiber, and the driving circuit board is electrically connected to the driving motor; the driving motor and the laser lens are both arranged beside the camera processor, and the laser lens is arranged corresponding to the visible window, the laser lens is fixedly arranged on the front side of the driving motor, and the driving motor can drive the laser lens to vibrate.

[0007] In one possible implementation, the vibration frequency of the driving motor is greater than the exposure time of the camera processor.

[0008] In one possible implementation, the driving motor can drive the laser lens to reciprocate up and down, and the height difference between the up and down movements is 1 mm.

[0009] In one possible implementation, the shell is a rectangular structure and is sealed; the driving circuit board is fixedly arranged on the rear side of the shell, the aviation plug is connected to the side wall of the shell, and the laser is arranged at the bottom of the shell and corresponds to the laser lens.

[0010] In one possible implementation, it also includes: a fixing plate, which is vertically arranged in the shell and parallel to the rear side of the shell; an opening is arranged on the fixing plate, the camera processor is bolted to the fixing plate, and the camera processor is arranged on the rear side of the opening, and the camera lens is fixed on the front side of the camera processor through the opening.

[0011] In one possible implementation, the drive motor is bolted to the fixing plate, the drive motor is a rectangular structure, and the bottoms on both sides of the drive motor are respectively provided with extension angles extending toward both sides, the bottom of the extension angle is flush with the bottom of the drive motor, and the top of the extension angle is smoothly connected to the side wall of the drive motor.

[0012] In one possible implementation, the front side of the shell is tilted, and the tilted position of the front side of the shell is tilted downward from front to rear; the angle between the front plane of the shell and the horizontal plane is a first preset angle α, and the value range of the first preset angle α is: 65°≤α≤80°.

[0013] In one possible implementation, the visible window is arranged at the inclined position, the visible window is a rectangular structure, and the visible window is horizontally arranged in front of the camera lens and the laser lens; the visible window is made of glass.

[0014] In one possible implementation, a skylight is provided on the top of the shell, and the skylight is arranged near the rear side of the shell. A matching cover plate is provided on the skylight, and the cover plate is bolted to the shell.

[0015] In one possible implementation, a waterproof breathable valve is provided on the outer shell, and the waterproof breathable valve is arranged on the other side opposite to the aviation plug; a clearance groove is provided on the front side of the outer shell, and the clearance groove is arranged along the front-to-back direction, and the clearance groove is arranged at the top and bottom of the outer shell. There are multiple clearance grooves, and the multiple clearance grooves correspond to the screw hole positions of the outer shell.

[0016] The beneficial effects of the present application are as follows: the driving circuit board, the driving motor, the camera processor, the camera lens, the laser and the laser lens are all integrated in the housing; the driving circuit board controls the laser to emit laser and transmits it to the laser lens through the optical fiber; the laser lens performs optical path shaping inside and shapes the laser spot into a straight spot and emits it to the object to be measured; during the process, the driving motor can drive the laser lens to reciprocate through the power supply and control of the driving circuit board; the camera lens captures the laser spot on the object to be measured and projects it onto the camera processor; the vibration of the laser lens makes the laser spot collected in one acquisition cycle of the camera to be a superposition of multiple positions and laser spot energies and light beams, thereby eliminating the fixed phase difference generated by the device to achieve the purpose of image denoising; according to a linear array scanning device capable of eliminating laser speckle of the present application, the interference phenomenon of the camera is eliminated, the generation of shot noise is avoided, and the effect of image denoising is achieved.

[0017] Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the present application and, together with the description, serve to explain the principles of the present application.

[0019] Figure 1 A first partial schematic diagram of a linear array scanning device capable of eliminating laser speckle according to an embodiment of the present application is shown;

[0020] Figure 2 A second partial schematic diagram showing a linear array scanning device capable of eliminating laser speckle according to an embodiment of the present application

[0021] Figure 3 A schematic diagram showing the oblique front structure of a linear array scanning device capable of eliminating laser speckle according to an embodiment of the present application;

[0022] Figure 4 A schematic diagram of the oblique rear structure of a linear array scanning device capable of eliminating laser speckle according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0023] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0024] Among them, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application or simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0027] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0028] As shown in the figure, the linear array scanning device capable of eliminating laser speckle includes: a driving circuit board 100, a driving motor 200, a camera processor 300, a camera lens 400, a laser 500, a laser lens 600, an aerial plug 700 and a housing 800.

[0029] The outer shell 800 is a shell structure with a hollow interior, and a visible window 820 is arranged on the front side of the outer shell 800. The visible window 820 is a visible structure used for imaging of the camera lens 400 and emitting lasers of the laser lens 600. The driving circuit board 100, the driving motor 200, the camera processor 300, the camera lens 400, the laser 500 and the laser lens 600 are all arranged in the outer shell 800.

[0030] The driving circuit board 100 is connected to the aerial plug 700 by wire; the driving circuit board 100 is connected to the camera processor 300 by wire, the camera processor 300 is connected to the aerial plug 700 by network cable, the camera lens 400 is arranged on the front side of the camera processor 300, and is arranged corresponding to the visible window 820; the driving circuit board 100 is connected to the laser 500 by wire, the laser 500 is connected to the laser lens 600 by optical fiber, and the driving circuit board 100 is electrically connected to the driving motor 200; the driving motor 200 and the laser lens 600 are both arranged beside the camera processor 300, and the laser lens 600 is arranged corresponding to the visible window 820, the laser lens 600 is fixedly arranged on the front side of the driving motor 200, and the driving motor 200 can drive the laser lens 600 to vibrate.

[0031] Workflow: The driving circuit board 100 is fixed with bolts on the rear side of the housing 800, and the aerial plug 700 is connected to the driving circuit wire. The external power supply is transmitted to the driving circuit board 100 through the aerial plug 700 and the wire. The driving circuit board 100 supplies power to the laser 500, the camera processor 300 and the driving motor 200 through the wire. The laser 500 is installed to the bottom of the housing 800 by screws, and the driving circuit board 100 supplies power to the laser 500. The laser 500 emits a laser and transmits it to the laser lens 600 through an optical fiber. The laser spot is shaped into a straight spot inside the laser lens 600, and the laser spot is shaped into a straight spot and hits the surface of the object to be measured through the visible window 820. Among them, the laser lens 600 is installed on the driving motor 200 by screws, and the driving motor 200 is installed on the fixing plate 810 by screws. After the driving motor 200 is powered and triggered by the driving circuit board 100, it can drive the laser lens 600 to reciprocate up and down with an amplitude of 1mm. The laser spot is reflected by the object to be measured and then transmitted back to the camera lens 400. After receiving the returned light, the camera lens 400 projects it onto the camera processor 300. When the driving motor 200 drives the laser lens 600 to perform a slow up and down reciprocating motion, there is no obvious change in the image captured by the camera lens 400. The camera processor 300 obtains the captured image of the light spot and transmits it to an external computer via a network cable for analysis and processing.

[0032] Among them, the driving circuit board 100 is responsible for receiving external power supply and trigger signals, as well as supplying power and transmitting signals to various components inside the module; the camera processor 300 and the camera lens 400 are mainly responsible for receiving the return light from the laser light source to the surface of the object, as well as capturing the image of the surface of the object, and outputting the image to the computer through processes such as photoelectric conversion; the laser 500, the laser lens 600 and the optical fiber are the laser light source parts. After the laser 500 module receives power from the driving circuit, it outputs laser and transmits the laser to the laser lens 600 through the optical fiber. The laser lens 600 processes the original light spot in the optical path and expands the laser beam into a straight linear laser. The energy distribution in the width direction of the straight linear laser is a flat-top distribution. After the laser spot is output by the laser lens 600, it is irradiated onto the surface of the object to provide fill light for the camera processor 300; the driving motor 200 is installed on the laser lens 600, and the driving motor 200 can provide a settable high-frequency reciprocating vibration.

[0033] In one possible implementation, the laser lens 600 can shape the laser spot into a flat-top beam with uniform energy distribution and a line width greater than 2 mm.

[0034] In a possible implementation, the vibration frequency of the driving motor 200 is greater than the exposure time of the camera processor 300 , and the vibration frequency of the driving motor 200 can be changed according to the exposure time of the camera processor 300 .

[0035] Based on the phenomenon of persistence of vision, the noise problem of shooting with laser can be eliminated. The vibration of the laser lens 600 causes the high-speed vibration of the laser spot, so that the laser spot collected in one acquisition cycle of the camera is the superposition of the laser spot energy and light beam at multiple positions, thereby eliminating the fixed phase difference generated, so as to achieve the purpose of image denoising.

[0036] In one possible implementation, the driving motor 200 can drive the laser lens 600 to reciprocate up and down, and the height difference of the up and down movement is 1 mm.

[0037] In one possible implementation, the housing 800 is a rectangular structure, and the housing 800 is sealed; the driving circuit board 100 is fixedly set on the rear side of the housing 800, the aviation plug 700 is connected to the side wall of the housing 800, and the laser 500 is set at the bottom of the housing 800 and is set corresponding to the laser lens 600.

[0038] In one possible implementation, it also includes: a fixing plate 810, which is vertically arranged in the outer shell 800, and the fixing plate 810 is arranged parallel to the rear side of the outer shell 800; an opening is arranged on the fixing plate 810, the camera processor 300 is bolted to the fixing plate 810, and the camera processor 300 is arranged on the rear side of the opening, and the camera lens 400 is fixed on the front side of the camera processor 300 through the opening.

[0039] In one possible implementation, the drive motor 200 is bolted to the fixing plate 810, and the drive motor 200 is a rectangular structure. The bottoms on both sides of the drive motor 200 are respectively provided with extension angles extending toward both sides, and the bottoms of the extension angles are flush with the bottom of the drive motor 200, and the tops of the extension angles are smoothly connected to the side walls of the drive motor 200.

[0040] In a possible implementation, the front side of the housing 800 is tilted, and the tilt position of the front side of the housing 800 is tilted downward from the front to the rear; the angle between the front plane of the housing 800 and the horizontal plane is a first preset angle α, and the value range of the first preset angle α is: 65°≤α≤80°. The tilt position of the front side of the housing 800 can prevent rainwater, dust and other debris from entering the housing 800, and its tilt angle can meet the laser lens 600 to still emit laser to the surface of the object to be measured when vibrating, and the camera lens 400 can receive the reflected light.

[0041] In one possible implementation, the visible window 820 is set in an inclined position, the visible window 820 is a rectangular structure, and the visible window 820 is horizontally set in front of the camera lens 400 and the laser lens 600; the visible window 820 is made of glass.

[0042] In one possible implementation, a skylight 830 is provided on the top of the housing 800 , and the skylight 830 is disposed near the rear side of the housing 800 . A matching cover plate 840 is disposed on the skylight 830 , and the cover plate 840 is bolted to the housing 800 .

[0043] In one possible implementation, a waterproof breathable valve 850 is provided on the outer shell 800, and the waterproof breathable valve 850 is arranged on the other side opposite to the aviation plug 700, and the waterproof breathable valve 850 is used to balance the air pressure inside and outside the outer shell; a clearance groove 860 is provided on the front side of the outer shell 800, and the clearance groove 860 is arranged along the front-to-back direction, and the clearance groove 860 is arranged at the top and bottom of the outer shell 800, and there are multiple clearance grooves 860, and the multiple clearance grooves 860 correspond to the screw hole positions of the outer shell 800.

[0044] It should be noted that although the present application is used as an example to introduce a linear array scanning device that can eliminate laser speckle, those skilled in the art will understand that the present application should not be limited thereto. In fact, the user can flexibly set various parameters according to personal preferences and / or actual application scenarios, as long as the design is reasonable.

[0045] In this way, the driving circuit board, driving motor, camera processor, camera lens, laser and laser lens are all integrated in the shell. The driving circuit board controls the laser to emit laser and transmits it to the laser lens through optical fiber. The laser lens performs optical path shaping inside and shapes the laser spot into a straight spot to be emitted to the object to be measured. During the process, the driving motor can drive the laser lens to reciprocate through the power supply and control of the driving circuit board. The camera lens shoots the laser spot on the object to be measured and projects it onto the camera processor. The vibration of the laser lens makes the laser spot collected in one acquisition cycle of the camera to be a superposition of multiple positions and laser spot energy and light beams, thereby eliminating the fixed phase difference generated by the eliminater to achieve the purpose of image denoising. According to a linear array scanning device that can eliminate laser speckle in the present application, the interference phenomenon of the camera is eliminated, the generation of shot noise is avoided, and the effect of image denoising is achieved.

[0046] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A linear array scanning device capable of eliminating laser speckle, characterized in that: include: Drive circuit board, drive motor, camera processor, camera lens, laser, laser lens, aviation plug and housing; The shell is a hollow shell structure, and a visible window is provided on the front side of the shell. The driving circuit board, the driving motor, the camera processor, the camera lens, the laser and the laser lens are all provided in the shell; The driving circuit board is connected to the aviation plug wire; The driving circuit board is connected to the camera processor by a wire, the camera processor is connected to the aviation plug network cable, and the camera lens is arranged on the front side of the camera processor and is arranged corresponding to the visual window; The driving circuit board is connected to the laser wire, the laser is connected to the laser lens optical fiber, and the driving circuit board is electrically connected to the driving motor; The driving motor and the laser lens are both arranged beside the camera processor, and the laser lens is arranged corresponding to the visible window. The laser lens is fixedly arranged in front of the driving motor, and the driving motor can drive the laser lens to vibrate.

2. The linear array scanning device capable of eliminating laser speckle according to claim 1, characterized in that: The vibration frequency of the driving motor is greater than the exposure time of the camera processor.

3. The linear array scanning device capable of eliminating laser speckle according to claim 2, characterized in that: The driving motor can drive the laser lens to reciprocate up and down, and the height difference of the up and down movement is 1mm.

4. The linear array scanning device capable of eliminating laser speckle according to any one of claims 1 to 3, characterized in that: The shell is a rectangular parallelepiped structure, and the shell is sealed; The driving circuit board is fixedly arranged on the rear side of the shell, the aviation plug is connected to the side wall of the shell, and the laser is arranged at the bottom of the shell and corresponds to the laser lens.

5. The linear array scanning device capable of eliminating laser speckle according to claim 4, characterized in that: Also includes: A fixing plate, the fixing plate being vertically arranged in the shell, and the fixing plate being arranged parallel to the rear side surface of the shell; The fixing plate is provided with an opening, the camera processor is bolted to the fixing plate, and the camera processor is arranged at the rear side of the opening, and the camera lens passes through the opening and is fixedly arranged at the front side of the camera processor.

6. The linear array scanning device capable of eliminating laser speckle according to claim 5, characterized in that: The drive motor is bolted to the fixing plate. The drive motor is a rectangular parallelepiped structure. The bottoms on both sides of the drive motor are respectively provided with extension angles extending toward both sides. The bottoms of the extension angles are flush with the bottom of the drive motor, and the tops of the extension angles are smoothly connected to the side walls of the drive motor.

7. The linear array scanning device capable of eliminating laser speckle according to claim 5, characterized in that: The front side of the shell is tilted, and the tilted position of the front side of the shell is tilted downward from front to rear; The angle between the front plane of the housing and the horizontal plane is a first preset angle α, and the value range of the first preset angle α is: 65°≤α≤80°.

8. The linear array scanning device capable of eliminating laser speckle according to claim 7, characterized in that: The visible window is arranged at the inclined position, the visible window is a rectangular structure, and the visible window is arranged horizontally in front of the camera lens and the laser lens; The visual window is made of glass.

9. The linear array scanning device capable of eliminating laser speckle according to any one of claims 1 to 3, characterized in that: A skylight is provided on the top of the shell, and the skylight is arranged at a position close to the rear side of the shell. A matching cover plate is provided on the skylight, and the cover plate is connected to the shell with bolts.

10. The linear array scanning device capable of eliminating laser speckle according to any one of claims 1 to 3, characterized in that: The housing is provided with a waterproof breathable valve, and the waterproof breathable valve is arranged on the other side opposite to the aviation plug; The front side of the shell is provided with a clearance groove, the clearance groove is arranged along the front-to-back direction, the clearance groove is arranged at the top and the bottom of the shell, there are multiple clearance grooves, and the multiple clearance grooves correspond to the screw hole positions of the shell.

Images