CN117148379A - System and method for detecting ghost images by variable resolution MEMS mirror scanning - Google Patents

System and method for detecting ghost images by variable resolution MEMS mirror scanning Download PDF

Info

Publication number
CN117148379A
CN117148379A CN202311120016.1A CN202311120016A CN117148379A CN 117148379 A CN117148379 A CN 117148379A CN 202311120016 A CN202311120016 A CN 202311120016A CN 117148379 A CN117148379 A CN 117148379A
Authority
CN
China
Prior art keywords
module
ghost imaging
target
dmd
point detector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311120016.1A
Other languages
Chinese (zh)
Inventor
韩斌
梁龙
郝群
曹杰
史牟丹
李林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Institute of Technology BIT
Original Assignee
Beijing Institute of Technology BIT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing Institute of Technology BIT filed Critical Beijing Institute of Technology BIT
Priority to CN202311120016.1A priority Critical patent/CN117148379A/en
Publication of CN117148379A publication Critical patent/CN117148379A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88—Lidar systems specially adapted for specific applications
    • G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging
    • G01S17/894—3D imaging with simultaneous measurement of time-of-flight at a 2D array of receiver pixels, e.g. time-of-flight cameras or flash lidar
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/08—Systems determining position data of a target for measuring distance only
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/4808—Evaluating distance, position or velocity data
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4817—Constructional features, e.g. arrangements of optical elements relating to scanning

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Electromagnetism (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Abstract

The application discloses a system and a method for detecting ghost images by variable resolution MEMS mirror scanning, comprising the following steps: the device comprises a laser emission module, a beam deflection module, a ghost imaging module and an echo receiving module; the laser emission module is used for emitting light beams; the beam deflection module is used for deflecting the beam to scan a target; the ghost imaging module is used for deflecting the echo light beam during primary scanning and modulating the echo light mask during ghost imaging; and the echo receiving module is used for receiving the light beam reflected by the ghost imaging module. The application combines the traditional laser radar system with the ghost imaging system, can realize detection and three-dimensional perception of surrounding environment, further determine an interested target, perform ghost imaging on the interested target, and realize high-resolution three-dimensional reconstruction, thereby achieving the purpose of changing resolution and greatly improving the imaging efficiency of the system.

Description

System and method for detecting ghost images by variable resolution MEMS mirror scanning
Technical Field
The application belongs to the technical field of three-dimensional imaging, and particularly relates to a system and a method for detecting ghost imaging by variable resolution MEMS mirror scanning.
Background
Ghost imaging is a three-dimensional imaging technique, also called correlated imaging, that obtains spatial three-dimensional image information of a target by using correlation of an echo signal and an outgoing signal of the target. The method has the advantages of strong anti-interference capability and high imaging resolution.
Conventional MEMS mirror-based lidar systems can only perform fixed resolution scanning imaging of a target, and have poor background performance in some applications requiring high resolution imaging, such as higher resolution imaging of a target in an area of a scene. The ghost imaging system has the characteristic of high-resolution imaging, and can realize variable-resolution scanning imaging by introducing the ghost imaging system into the system, so that the high-resolution imaging of an interested target is realized, and the imaging efficiency of the system is improved.
Disclosure of Invention
In order to solve the technical problems, the application provides a system and a method for detecting ghost imaging by scanning a variable resolution MEMS mirror, which combine a traditional laser radar system with a ghost imaging system to realize detection and three-dimensional perception of surrounding environment, further determine an interested target, perform ghost imaging on the interested target and realize high-resolution three-dimensional reconstruction, thereby achieving the purpose of variable resolution and greatly improving the imaging efficiency of the system.
To achieve the above object, the present application discloses a system for scanning and detecting ghost images by a variable resolution MEMS mirror, comprising: the device comprises a laser emission module, a beam deflection module, a ghost imaging module and an echo receiving module;
the laser emission module is used for emitting light beams;
the beam deflection module is used for deflecting the beam to scan a target;
the ghost imaging module is used for deflecting the echo light beam during primary scanning and modulating the echo light mask during ghost imaging;
and the echo receiving module is used for receiving the light beam reflected by the ghost imaging module.
Optionally, the laser emitting module includes: a pulse laser and a collimating lens;
the pulse laser is used for generating and transmitting a pulse laser beam,
the collimating lens is used for collimating the light beam.
Optionally, the beam deflection module includes: a mirror with holes and a MEMS mirror;
the pulse laser, the collimating lens, the reflecting mirror with the hole and the MEMS reflecting mirror are all positioned on the same optical axis; the perforated mirror and the MEMS mirror are kept parallel and perpendicular to the optical axis;
the reflecting mirror with holes is used for changing the direction of the light beam, so that the light beam is emitted and scans the target;
the MEMS reflector is used for reflecting the incident light beam and carrying out annular scanning with gradually increased radius.
Optionally, the ghost imaging module includes: a converging lens and a DMD;
the converging lens and the DMD are positioned on the same optical axis; the converging lens and the DMD are both positioned on the same side of the laser emission module and the light beam deflection module;
the converging lens is used for converging the returned light to the DMD;
the DMD is used for reflecting the converged light to the echo receiving module.
Optionally, the echo receiving module includes: a first single-point detector and a second single-point detector;
the first single-point detector and the second single-point detector are respectively positioned at two sides of the optical axis of the ghost imaging module; the first single-point detector and the second single-point detector are positioned on the same side of the laser emission module and the beam deflection module;
and the first single-point detector and the second single-point detector both receive the light beams reflected by the DMD, convert the light signals into electric signals, and transmit the electric signals to a PC end for processing.
When the DMD does not perform ghost imaging in the first working state, the DMD is used as a reflecting mirror, the DMD does not throw a speckle mask pattern at the moment, a return light beam is not modulated, and the return light beam is reflected by the DMD and is received by the first single-point detector and the second single-point detector;
and when the second working state is that the DMD performs ghost imaging, the DMD is controlled to project a plurality of speckle mask patterns, and the returned light beams are received by the first single-point detector and the second single-point detector after mask modulation.
In order to achieve the above object, the present application discloses a method for detecting ghost imaging by variable resolution MEMS mirror scanning, comprising:
the method comprises the steps that a pulse laser emits light beams, the light beams are collimated by a collimating lens and then emitted, the emitted light beams pass through a perforated reflecting mirror and then are subjected to annular scanning with gradually increased radius by an MEMS reflecting mirror, wherein the number of scanning points of each ring is fixed, and the radius is gradually increased by a fixed value to the maximum angle of the scanning of the MEMS reflecting mirror;
after the light beam is reflected by the MEMS mirror, an annular scanning pattern is formed, and after the light beam is reflected by the reflecting mirror with holes, the direction of the light beam is changed, and the detection target is scanned in an annular mode with gradually increased radius;
and the echo light beam reflected by the target reaches the DMD, and whether ghost imaging is performed or not is judged.
Optionally, determining whether to perform ghost imaging includes:
the first single-point detector and the second single-point detector receive the echo light beam reflected by the DMD, convert the light signal into an electric signal, upload the electric signal to a PC end for processing, acquire the time when the laser is transmitted to the first single-point detector and the second single-point detector to receive the echo, and acquire the target distance according to a time-of-flight ranging method;
presetting a maximum distance of an interested target, comparing the obtained target distance with the preset maximum distance, judging whether the target is the interested target, performing ghost imaging association operation on the interested target, obtaining a reconstructed image, and fusing the reconstructed image with the target distance to generate a three-dimensional image.
Optionally, the target distance is:
where d is the distance between the target and the system, c is the speed of light, and Δt is the time of flight.
Optionally, the reconstructed image is:
wherein p is i Representing the projected ith mask pattern, y i Representing the intensity measurement obtained by projecting the ith mask pattern, M x N is the image resolution, q (x, y) is the reconstructed image.
Compared with the prior art, the application has the following advantages and technical effects:
according to the system and the method for detecting ghost images by scanning the variable-resolution MEMS mirror, the traditional laser radar system is combined with the ghost imaging system, so that detection and three-dimensional perception of surrounding environment can be realized, an interested target is further determined, ghost images are carried out, and high-resolution three-dimensional reconstruction is realized. Compared with the traditional single laser radar system, the laser radar system has the advantages of rich functions and high integration level. In addition, the application can realize variable resolution three-dimensional imaging of the target, and greatly improves the imaging efficiency of the system.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic diagram of a system for detecting ghost images by scanning with a variable resolution MEMS mirror according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a variable resolution scanning ghost image in accordance with an embodiment of the present application;
FIG. 3 is a flowchart of a method for variable resolution MEMS mirror scanning detection ghost imaging in accordance with an embodiment of the present application;
1, a pulse laser; 2. a collimating lens; 3. a mirror with a hole; 4. a MEMS mirror; 5. a target; 6. a converging lens; 7. DMD (digital micromirror device); 8. a first single-point detector; 9. a second single point detector; 10. and a PC terminal.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.
As shown in fig. 1, the embodiment discloses a system for scanning and detecting ghost images by using a variable resolution MEMS mirror, and the whole system adopts a non-coaxial optical path and comprises a laser emitting module, a beam deflection module, a ghost imaging module and an echo receiving module. The laser emission module is used for generating and emitting a light beam with specific wavelength and light beam quality meeting the scanning detection condition; the beam deflection module deflects the emitted beam by reflection or the like to scan the target; the ghost imaging module deflects the echo light beam during primary scanning, and modulates the echo light mask during ghost imaging; the echo receiving module is used for deflecting the light beam reflected by the target and receiving the light beam by the detector, converting the light signal into an electric signal, and transmitting the electric signal to the PC end 10 for acquiring, processing and calculating related information.
Specifically, the laser emission module part comprises a pulse laser 1, a collimating lens 2 and a laser beam generator, wherein the pulse laser beam is generated and emitted, and the collimating lens is used for collimating the beam and reducing the divergence angle of the beam;
the beam deflection module part comprises a reflecting mirror 3 with a hole, wherein the small hole is a beam path, the reflecting mirror changes the direction of the beam to make the beam emergent and scan a target, a 2D MEMS reflecting mirror 4 reflects the incident beam and performs annular scanning with gradually increased radius;
the ghost imaging module part comprises a converging lens 6 which converges the returned light beam on the DMD7, the DMD7 has two states when in operation, the '1' corresponds to deflection +12 degrees, the '0' corresponds to deflection-12 degrees, and the lens is a reflecting mirror when not in operation and reflects the returned light beam to the detector; when ghost imaging is carried out, the returned light beam is modulated by a mask and then projected onto a detector;
the receiving module part comprises a first single-point detector 8 and a second single-point detector 9, which correspond to the two working states of the DMD7, and receives echo signals, converts the optical signals into electric signals and transmits the electric signals to the PC end 10 for processing.
The basic principle of the system proposed by the embodiment is as follows:
the pulse laser 1 emits pulse light, the light beam is collimated by the collimating lens 2, then passes through the small hole of the perforated reflector 3 and then is beaten to the MEMS reflector 4, the MEMS reflector 4 performs annular scanning with gradually increased radius, and the reflected light is emitted after being reflected by the perforated reflector to scan the surrounding environment; the light beam reflected by the target 5 is converged on the DMD7 through the converging lens 6, and at this time, the DMD7 does not work and serves as a reflecting mirror to reflect the received light beam to the first single-point detector 8 and the second single-point detector 9, and the detectors convert the light signal into a processable electric signal and then the processable electric signal is processed by the PC terminal 10.
The PC end 10 obtains the flight Time (TOF) of the surrounding environment target according to the echo information, calculates the distance between the target to be detected and the system according to the formula d=1/2·Δt·c, judges whether the target is an interested target according to the distance information between the target and the system, if not, associates the angle information scanned by the MEMS reflector 4 with the calculated distance information to obtain a three-dimensional point cloud image of the target, wherein the image comprises all the information of a scanning view field, but has lower resolution as shown in fig. 2; if the target is an interested target, the echo light beams are converged to the DMD7 through the flow, as shown in fig. 2, at the moment, the DMD7 works to perform ghost imaging on the interested target area, the DMD7 is controlled to perform mask modulation on the echo light beams, and then the modulated light intensity information is received by the first single-point detector and the second single-point detector, wherein the two modulated light intensity information are placed for the purpose of ensuring that all echo signals reflected by the DMD can be received, the PC end 10 performs association operation on the echo signals and mask patterns, and further a three-dimensional image of the interested target with higher resolution is obtained, so that the ghost imaging on the interested target with high resolution is realized.
The embodiment also provides a method for scanning and detecting ghost images by using the variable resolution MEMS mirror, which is shown in fig. 3 and comprises the following steps:
firstly, the light beam emitted by the pulse laser 1 is emitted after being collimated by the collimating lens 2, the system light beam diameter requirement is met, the MEMS reflecting mirror 4 performs annular scanning with gradually increased radius, wherein the number of scanning points of each ring is fixed, and the radius gradually increases to the maximum angle which can be scanned by the MEMS reflecting mirror 4.
The ring scan with gradually increasing radius of the MEMS mirror 4 is determined by its driving voltage, taking the scan point on a certain ring in the scanning process as an example, the number of scan rings in the ring scan is set to be m, the number of scan points of each ring is n, the inter-ring growth coefficient is r, a i For the driving voltage amplitude of the ith loop, a is the initial bias voltage amplitude of the MEMS mirror, the deflection angle of the MEMS mirror 4 is controlled by the voltage difference of two signals in the same group of channels, and the driving voltages of the four channels of the MEMS at the ith loop and the jth scanning point can be expressed as:
after the light beam is reflected by the MEMS reflector 4, an annular scanning pattern is formed, and after the light beam is reflected by the perforated reflector 3, the light direction is changed, and the targets are detected by annular scanning with gradually increased radius, each target corresponds to two scanning angles related to the MEMS reflector 4, and the horizontal scanning angle is set as theta and the pitching scanning angle
The echo beam reflected by the target reaches the DMD7 to judge whether ghost imaging is performed or not, at this time, the conventional scanning detection based on the MEMS mirror 4 is performed, so that the DMD7 does not perform ghost imaging, and as the echo beam reflected by the mirror, the echo beam is received by the first and second detectors, and then converted into an electrical signal, and uploaded to the PC terminal 10 for processing, so as to obtain the time when the laser is emitted to the detector to receive the echo, and the target distance is obtained according to a time-of-flight (TOF) ranging method, and the formula for calculating the distance is expressed as follows:
where d is the distance between the target and the system, c is the speed of light, and Δt is the time of flight.
Judging whether the target is an interested target according to the distance information, and setting the maximum distance of the interested target as d max . If a target distance d is within a detectable range>d max When the target is not considered to be the target of interest, the distance information of all the areas in the detection range is then correlated with the corresponding angle information scanned by the MEMS mirror 4, and processed by the distance information d and the two angle information theta and thetaThe three-dimensional point cloud coordinates (x, y, z) of the target can be obtained to form a three-dimensional image, and the low-resolution scanning detection of the surrounding environment is realized because the number of points of the point cloud image, namely the number of pixels of the image, is lower due to the limitation of the scanning ring number m, the number of points n and the like of the MEMS reflector 4;
if a target distance d is within a detectable range<＝d max When the object is considered to be an object of interest, the emission scanning process is performed again, when the echo light beam reaches the DMD7, ghost images are performed on the object of interest, the mask modulation pattern of the DMD7 modulates the light intensity, the first and second single-point detectors receive and upload the light intensity to the PC end 10,and carrying out correlation operation on the received measured value with the target light intensity information and the mask pattern to reconstruct an image of the target.
Setting the resolution of the image as MxN, (M, N is respectively larger than M and N), projecting MxN mask patterns, and measuring the light intensity detected by the first detector and the second detector as y= { y 1 ,y 2 …y M×N The reconstructed annular image is q (x, y):
wherein p is i Representing the projected ith mask pattern, y i Representing the intensity measurements obtained by projecting the ith mask pattern.
And performing correlated operation of ghost imaging on the interested target according to the formula, obtaining a high-resolution two-dimensional image which is the interested target due to the characteristic of high resolution of DMD imaging, and fusing the distance information d with the high-resolution two-dimensional image to generate a three-dimensional image.
The whole process realizes variable resolution MEMS mirror scanning detection ghost imaging, can obtain a low resolution M x N three-dimensional image of the surrounding environment, and performs ghost imaging on an interested target to obtain a high resolution M x N three-dimensional image of the interested target, thereby realizing variable resolution scanning detection.
The present application is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present application are intended to be included in the scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims (10)

1. A system for variable resolution MEMS mirror scanning detection ghost imaging, comprising: the device comprises a laser emission module, a beam deflection module, a ghost imaging module and an echo receiving module;
the laser emission module is used for emitting light beams;
the beam deflection module is used for deflecting the beam to scan a target;
the ghost imaging module is used for deflecting the echo light beam during primary scanning and modulating the echo light mask during ghost imaging;
and the echo receiving module is used for receiving the light beam reflected by the ghost imaging module.
2. A variable resolution MEMS mirror scan ghost imaging system according to claim 1, wherein the laser emitting module comprises: a pulse laser and a collimating lens;
the pulse laser is used for generating and transmitting a pulse laser beam,
the collimating lens is used for collimating the light beam.
3. A variable resolution MEMS mirror scan ghost image detection system according to claim 2, wherein the beam deflection module comprises: a mirror with holes and a MEMS mirror;
the pulse laser, the collimating lens, the reflecting mirror with the hole and the MEMS reflecting mirror are all positioned on the same optical axis; the perforated mirror and the MEMS mirror are kept parallel and perpendicular to the optical axis;
the reflecting mirror with holes is used for changing the direction of the light beam, so that the light beam is emitted and scans the target;
the MEMS reflector is used for reflecting the incident light beam and carrying out annular scanning with gradually increased radius.
4. A variable resolution MEMS mirror scan detection ghost imaging system according to claim 1, wherein the ghost imaging module comprises: a converging lens and a DMD;
the converging lens and the DMD are positioned on the same optical axis; the converging lens and the DMD are both positioned on the same side of the laser emission module and the light beam deflection module;
the converging lens is used for converging the returned light to the DMD;
the DMD is used for reflecting the converged light to the echo receiving module.
5. A variable resolution MEMS mirror scan detection ghost imaging system according to claim 4, wherein the echo receiving module comprises: a first single-point detector and a second single-point detector;
the first single-point detector and the second single-point detector are respectively positioned at two sides of the optical axis of the ghost imaging module; the first single-point detector and the second single-point detector are positioned on the same side of the laser emission module and the beam deflection module;
and the first single-point detector and the second single-point detector both receive the light beams reflected by the DMD, convert the light signals into electric signals, and transmit the electric signals to a PC end for processing.
6. A variable resolution MEMS mirror scan detection ghost imaging system according to claim 5, wherein the DMD comprises: a first operating state and a second operating state;
when the DMD does not perform ghost imaging in the first working state, the DMD is used as a reflecting mirror, the DMD does not throw a speckle mask pattern at the moment, a return light beam is not modulated, and the return light beam is reflected by the DMD and is received by the first single-point detector and the second single-point detector;
and when the second working state is that the DMD performs ghost imaging, the DMD is controlled to project a plurality of speckle mask patterns, and the returned light beams are received by the first single-point detector and the second single-point detector after mask modulation.
7. A method of variable resolution MEMS mirror scanning ghost imaging using the system of claims 1-6, comprising:
the method comprises the steps that a pulse laser emits light beams, the light beams are collimated by a collimating lens and then emitted, the emitted light beams pass through a perforated reflecting mirror and then are subjected to annular scanning with gradually increased radius by an MEMS reflecting mirror, wherein the number of scanning points of each ring is fixed, and the radius is gradually increased by a fixed value to the maximum angle of the scanning of the MEMS reflecting mirror;
after the light beam is reflected by the MEMS mirror, an annular scanning pattern is formed, and after the light beam is reflected by the reflecting mirror with holes, the direction of the light beam is changed, and the detection target is scanned in an annular mode with gradually increased radius;
and the echo light beam reflected by the target reaches the DMD, and whether ghost imaging is performed or not is judged.
8. A method of variable resolution MEMS mirror scan detection ghosting imaging as in claim 7, wherein determining whether to perform ghosting imaging comprises:
the first single-point detector and the second single-point detector receive the echo light beam reflected by the DMD, convert the optical signal into an electric signal, upload the electric signal to a PC end for processing, acquire the time when the laser is transmitted to the first single-point detector and the second single-point detector to receive the echo, and acquire the target distance according to a time-of-flight ranging method;
presetting a maximum distance of an interested target, comparing the obtained target distance with the preset maximum distance, judging whether the target is the interested target, performing ghost imaging association operation on the interested target, obtaining a reconstructed image, and fusing the reconstructed image with the target distance to generate a three-dimensional image.
9. A method of variable resolution MEMS mirror scan detection ghost imaging according to claim 8, wherein the target distance is:
where d is the distance between the target and the system, c is the speed of light, and Δt is the time of flight.
10. A method of variable resolution MEMS mirror scan detection ghost imaging according to claim 8, wherein the reconstructed image is:
wherein p is i Representing the projected ith mask pattern, y i Representing the intensity measurement obtained by projecting the ith mask pattern, M x N is the image resolution, q (x, y) is the reconstructed image.
CN202311120016.1A 2023-09-01 2023-09-01 System and method for detecting ghost images by variable resolution MEMS mirror scanning Pending CN117148379A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311120016.1A CN117148379A (en) 2023-09-01 2023-09-01 System and method for detecting ghost images by variable resolution MEMS mirror scanning

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311120016.1A CN117148379A (en) 2023-09-01 2023-09-01 System and method for detecting ghost images by variable resolution MEMS mirror scanning

Publications (1)

Publication Number Publication Date
CN117148379A true CN117148379A (en) 2023-12-01

Family

ID=88907561

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311120016.1A Pending CN117148379A (en) 2023-09-01 2023-09-01 System and method for detecting ghost images by variable resolution MEMS mirror scanning

Country Status (1)

Country Link
CN (1) CN117148379A (en)

Similar Documents

Publication Publication Date Title
CN112698300B (en) Laser radar control method and device, storage medium and electronic device
CN112805595B (en) Laser radar system
CN113970757A (en) Depth imaging method and depth imaging system
CN111289995A (en) Three-dimensional laser radar device and system
CN110161483A (en) Laser radar system
US20200088850A1 (en) Lidar system
CN211741575U (en) High-dimensional detection device based on optical synchronization
CN113721256A (en) Angle splicing laser radar system
CN117148379A (en) System and method for detecting ghost images by variable resolution MEMS mirror scanning
CN110456371A (en) A kind of laser radar system and relevant measurement method
CN216748074U (en) Wide-angle solid-state laser radar system
US11940564B2 (en) Laser radar device
CN111505654A (en) Object position detection method and laser radar
CN112596043B (en) High-angle resolution laser radar and detection method
CN116299513A (en) Laser radar apparatus and laser radar scanning method
CN209803333U (en) Three-dimensional laser radar device and system
JPH11142122A (en) Range finder
WO2020187677A1 (en) Lidar device for a vehicle and method for increasing the detection range of a corresponding lidar device
CN111913165A (en) Detection system and detection method thereof
CN112835012A (en) Three-dimensional laser radar detection device and method
CN111257908B (en) High-dimensional detection method based on optical synchronization
WO2023143593A1 (en) Laser system and laser measurement method
US20230075080A1 (en) Systems and methods of calibration of low fill-factor sensor devices and object detection therewith
CN112596073B (en) Long-distance high-resolution laser radar and detection method
US20230176221A1 (en) Lidar system with reduced parallax, distortion, and defocus issues

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination