WO2022252873A1 - 相机内参的标定验证方法、装置、设备及介质 - Google Patents
相机内参的标定验证方法、装置、设备及介质 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
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Definitions
- the internal parameters of the camera include the focal length fx, fy, the coordinates of the optical center of the camera cx, cy, and the time delay between the camera and the inertial navigation, etc. Since the internal parameters of the camera determine the conversion relationship of the object from the camera coordinates to the pixel coordinates, the calibration of the internal camera parameters Accuracy determines image quality.
- a method for calibrating and verifying camera intrinsic parameters comprising: acquiring multiple reference images captured by a target camera under preset shooting conditions and multiple reference world coordinates, wherein, The internal camera parameters of the target camera have been calibrated; the first coordinate change parameters corresponding to the multiple reference world coordinates are determined according to the preset shooting conditions, and the second coordinate change parameters of the multiple reference images are determined according to a preset algorithm ; Judging whether the second coordinate change parameter is consistent with the first coordinate change parameter; if the second coordinate change parameter is consistent with the first coordinate change parameter, feeding back a verification message that the camera internal parameter calibration is successful.
- a device for calibration and verification of camera internal parameters includes: an acquisition module, used to acquire the target camera under preset shooting conditions under the condition of a plurality of reference world coordinates A plurality of reference images, wherein the target camera has been calibrated with internal camera parameters; a determination module, configured to determine the first coordinate change parameters corresponding to the plurality of reference world coordinates according to the preset shooting conditions, and determine according to a preset algorithm The second coordinate change parameters of the plurality of reference images; a judging module, configured to determine whether the second coordinate change parameters are consistent with the first coordinate change parameters; a verification feedback module, configured to determine whether the second coordinate change parameters are consistent When the parameter is consistent with the first coordinate change parameter, a verification message that the calibration of the camera internal parameters is successful is fed back.
- the calibration verification system includes an upload unit, a processing unit, and a result feedback unit.
- a plurality of reference images uploaded by the system, and/or, a video containing the plurality of reference images, wherein the plurality of reference images are target cameras whose internal parameters have been calibrated, and the plurality of reference images under preset shooting conditions photographed under conditions of world coordinates;
- the processing unit is configured to determine the first coordinate change parameters corresponding to the multiple reference world coordinates according to the preset shooting conditions, and determine the multiple reference images according to a preset algorithm
- the second coordinate change parameter and when it is judged that the second coordinate change parameter is consistent with the first coordinate change parameter, generate a verification message that the camera internal parameters are calibrated successfully; the result feedback unit is used to feed back the verification information.
- an electronic device includes: a processor; a memory for storing instructions executable by the processor; The executable instructions are read and executed to implement the method for calibration and verification of camera internal parameters as provided by the embodiments of the present disclosure.
- a computer-readable storage medium stores a computer program, and the computer program is used to execute the method for calibrating and verifying camera intrinsic parameters as provided in the embodiment of the present disclosure.
- a computer program including: instructions, which, when executed by a processor, cause the processor to execute the method for calibrating and verifying camera intrinsic parameters as provided in the embodiments of the present disclosure.
- a computer program product including instructions, which, when executed by a processor, cause the processor to execute the method for calibrating and verifying camera intrinsic parameters as provided in the embodiments of the present disclosure.
- FIG. 1 is a schematic flowchart of a method for calibrating and verifying camera internal parameters provided by an embodiment of the present disclosure
- FIG. 2 is a schematic flowchart of another method for calibration and verification of internal camera parameters provided by an embodiment of the present disclosure
- Fig. 3(a) is a schematic diagram of the positions of multiple reference world coordinates provided by an embodiment of the present disclosure
- FIG. 3(b) is a schematic diagram of another position of multiple reference world coordinates provided by an embodiment of the present disclosure.
- FIG. 4 is a schematic flowchart of another method for calibration and verification of internal camera parameters provided by an embodiment of the present disclosure
- FIG. 5 is a schematic flowchart of another method for calibration and verification of internal camera parameters provided by an embodiment of the present disclosure
- FIG. 6(a) is a schematic diagram of a plurality of reference images provided by an embodiment of the present disclosure.
- FIG. 6(b) is a schematic diagram of another multiple reference images provided by an embodiment of the present disclosure.
- FIG. 7 is a schematic structural diagram of a camera internal reference calibration and verification system provided by an embodiment of the present disclosure.
- Fig. 8(a) is a schematic diagram of a scene where a camera internal reference is applied on a server side according to an embodiment of the present disclosure
- FIG. 8(b) is a schematic diagram of a scene where another camera internal reference is applied on the server side according to an embodiment of the present disclosure
- FIG. 9 is a schematic structural diagram of a camera internal reference calibration and verification device provided by an embodiment of the present disclosure.
- FIG. 10 is a schematic structural diagram of an electronic device provided by an embodiment of the present disclosure.
- the term “comprise” and its variations are open-ended, ie “including but not limited to”.
- the term “based on” is “based at least in part on”.
- the term “one embodiment” means “at least one embodiment”; the term “another embodiment” means “at least one further embodiment”; the term “some embodiments” means “at least some embodiments.” Relevant definitions of other terms will be given in the description below.
- the inventors of the present disclosure found that, in related technologies, the calibration and verification process of camera internal parameters are not independent, and the algorithm during calibration is the same as the algorithm during verification.
- the checkerboard calibration method to verify the calibrated camera internal parameters may lead to the inability to accurately verify the calibration error.
- an embodiment of the present disclosure provides a method for calibration and verification of camera internal parameters, so as to improve the accuracy of calibration and verification of camera internal parameters.
- the method will be introduced in conjunction with specific embodiments below.
- Fig. 1 is a schematic flowchart of a method for calibrating and verifying camera internal references provided by an embodiment of the present disclosure.
- the method can be executed by a device for calibrating and verifying camera internal references, wherein the device can be implemented by software and/or hardware, and generally can be integrated in a
- the electronic equipment of the camera includes but is not limited to smart phones, wearable devices, notebook computers, etc.
- the target camera in this embodiment has already calibrated the internal camera parameters before taking the reference image.
- the method for calibrating the camera internal parameters can be any algorithm that can realize the determination of camera internal parameters such as the Zhang Dingyou calibration method.
- a target camera is used to capture a calibration image of a preset calibration object, wherein the preset calibration object includes a calibration point, wherein the preset calibration object can be an object such as a chessboard that facilitates positioning of the calibration point, and further, Obtain the standard world coordinates of the calibration points, which can be pre-marked on the preset calibration object, and then extract the image coordinates of the calibration points in the calibration image, because the image coordinates reflect the mapping of the calibration points to the two-dimensional image As a result, therefore, a transformation matrix between standard world coordinates and image coordinates can be calculated, and this transformation matrix can be used as a camera intrinsic.
- shooting conditions are set in advance, and multiple reference world coordinates under the shooting conditions meet certain coordinate change conditions, so as to facilitate subsequent coordinate comparison. That is, any number of reference world coordinates under preset shooting conditions are known, so as to facilitate subsequent determination of calibration errors based on the reference world coordinates.
- the reference object can be any object, and each reference world coordinate has a corresponding reference image, which is convenient for determining the conversion relationship between the target camera from 3D to 2D.
- Step 102 Determine first coordinate change parameters corresponding to a plurality of reference world coordinates according to preset shooting conditions, and determine second coordinate change parameters of multiple reference images according to a preset algorithm.
- first coordinate change parameter and the second coordinate change parameter in this embodiment may include any parameters that directly or indirectly reflect the coordinate change, for example, it may be a change parameter of the coordinate value itself, and for example, it may be the same as Coordinate values related to area change parameters of reference objects, etc., will be specifically described in subsequent embodiments, and will not be repeated here.
- Step 103 judging whether the second coordinate change parameter is consistent with the first coordinate change parameter.
- Step 104 if the second coordinate change parameter is consistent with the first coordinate change parameter, feedback a verification message indicating that the calibration of the camera internal parameters is successful.
- the second coordinate change parameter is consistent with the first coordinate change parameter. If they are consistent, it indicates that the conversion relationship from the world coordinates to the pixel coordinates of the reference object is stable under the action of the camera internal parameters. Therefore, The internal reference error of the camera is in a lower range, and a verification message of successful calibration of the internal reference of the camera is fed back.
- the verification and calibration of camera internal parameters in this embodiment are two independent processes.
- the verification is performed from another angle, that is, the coordinate change parameters, which realizes the decoupling of calibration and verification, and improves the The accuracy of the verification error and the automatic execution of the verification process can be applied on a large scale to the camera production line for calibration verification.
- the calibration and verification of the camera's internal parameters are decoupled to improve the accuracy of the calibration and verification of the camera's internal parameters, and the calibration and verification of the camera's internal parameters are automatically performed, providing technical support for the efficiency of the camera's internal reference calibration.
- the error degree can also be directly calculated according to the second coordinate change parameter and the first coordinate change parameter. Quantitative, to provide a reference for correcting the internal parameters of the camera.
- the method further includes:
- Step 201 if the second coordinate change parameter is not consistent with the first coordinate change parameter, calculate the coordinate change parameter difference between the second coordinate change parameter and the first coordinate change parameter.
- the second coordinate change parameter in this embodiment is inconsistent with the first coordinate change parameter, it may be that the difference between the second coordinate change parameter and the first coordinate change parameter is greater than a preset threshold, etc., in order to quantify the second coordinate change parameter
- the degree of inconsistency between the first coordinate change parameter and the coordinate change parameter difference between the second coordinate change parameter and the first coordinate change parameter is calculated.
- the second coordinate change parameter and the first coordinate change parameter are the coordinate drift of the Z axis
- the coordinate drift of the Z axis corresponding to the first coordinate change parameter is basically 0, the Z corresponding to the second coordinate change parameter If the coordinate drift of the axis is large, it is considered that the second coordinate change parameter is inconsistent with the first coordinate change parameter, so the difference between the second coordinate change parameter and the Z-axis coordinate drift corresponding to the first coordinate change parameter is used as the coordinate Variation parameter difference.
- the method of correcting the camera internal parameters according to the coordinate change parameter difference is different.
- the coordinate change parameter difference and the camera internal parameter correction value can be constructed in advance according to the delay data.
- the corresponding relationship between, query the corresponding relationship to obtain the correction value corresponding to the coordinate change parameter difference, the correction value can be positive or negative, and then add the corresponding correction value in the original camera to obtain the corrected camera internal reference.
- the coordinate change parameter difference is provided as a loss value to the camera intrinsic parameter calibration algorithm, and the camera intrinsic parameter calibration algorithm corrects the camera internal parameter again according to the coordinate change parameter difference until the verification is passed.
- the method for calibration and verification of camera internal parameters in the embodiment of the present disclosure can quantify the degree of calibration error of camera internal parameters when it is known that the verification of camera internal parameters fails, so as to improve the efficiency of camera internal reference calibration.
- the preset shooting conditions are related to the coordinate change relationship of multiple reference world coordinates. Therefore, it can also be understood that the preset shooting conditions can be any conditions that specify the camera position when shooting the reference image.
- the following example illustrate:
- the preset shooting condition may be to limit the shooting position of the camera according to a preset random distribution function.
- the camera is randomly controlled to shoot under the corresponding random reference world coordinates according to the random distribution function
- the reference image therefore, can subsequently calibrate the internal parameters of the camera according to whether the shooting coordinate changes deduced from the reference image conform to the distribution law of the random distribution function.
- multiple first coordinate values of the preset dimension are the first coordinate change parameters.
- the preset dimension is the dimension corresponding to the Z axis
- the coordinate values of multiple Z axes are used as the first coordinate change Parameter.
- the method further includes step 403 to step 405 .
- Step 403 Determine a first coordinate change function according to a plurality of first coordinate values in a preset dimension.
- Step 405 judging whether the first coordinate change function is consistent with the second coordinate change function.
- Step 501 Determine a plurality of standard imaging areas corresponding to a plurality of reference world coordinates of a shooting reference object under preset shooting conditions, and determine the multiple standard imaging areas as a first coordinate change parameter.
- Step 502 determine multiple actual imaging areas of the shooting reference object in multiple reference images, and determine the multiple actual imaging areas as the second coordinate change parameter.
- Step 503 Determine a first area change function according to a plurality of standard imaging areas.
- the first area change function M1 S2+(t-1) , where t is the serial number in the queue after multiple standard imaging areas are arranged according to the coordinate order of the corresponding reference world coordinates, and S2 is an arbitrary fixed value.
- the second area change function is determined according to multiple actual imaging areas. For example, the functional relationship of area values between multiple actual imaging areas corresponding to multiple standard imaging areas is calculated.
- Step 505 judging whether the first area change function is consistent with the second area change function.
- SLAM Simultaneous Localization and Mapping
- the calibration verification method of camera internal parameters in the embodiment of the present disclosure uses any coordinate change parameter that indirectly or directly reflects the conversion relationship of the reference object from world coordinates to pixel coordinates to verify whether the calibration of camera internal parameters is successful.
- the decoupling of internal reference calibration improves the accuracy of camera internal reference verification.
- the calibration and verification method of the camera's internal parameters can also be deployed to the server (preset calibration and verification system), and the user can interact with the front end of the server. To achieve the calibration of the camera's internal parameters, there is no need to master the specific calibration method.
- a plurality of reference images uploaded by a user through a preset calibration verification system, and/or a video containing a plurality of reference images is obtained. That is, in this embodiment, the multiple reference images may be multiple discrete images, or may be derived from a piece of video, and the continuous image frames in the video are determined as the corresponding multiple reference images.
- the calibration verification process in the background does not need to be mastered by the user, only the calibration verification result file package of the camera internal parameters corresponding to multiple reference images is displayed through the calibration verification system, wherein the verification result file package includes the second coordinate change The comparison result of the parameter and the first coordinate change parameter, and then, in response to the download request of the user for the verification result file package, download the verification result file package.
- the calibration and verification method of camera internal parameters in the embodiment of the present disclosure deploys the calibration and verification method of camera internal parameters to the preset calibration verification system, and the user can realize the calibration of camera internal parameters based on the interaction with the front end of the server without mastering specific
- the calibration method reduces the user's learning cost and improves the calibration efficiency of the camera's internal parameters.
- FIG. 7 is a schematic structural diagram of a system for calibration and verification of camera internal parameters proposed according to the present disclosure. As shown in FIG.
- the uploading unit 710 is configured to receive a plurality of reference images uploaded by the user in the calibration verification system, and/or a video containing a plurality of reference images, wherein the plurality of reference images are target cameras whose intrinsic camera parameters have been calibrated, in a preset Shooting under conditions of multiple reference world coordinates.
- the upload unit 710 also provides a visualized front-end upload operation interface for users to upload images or videos.
- the upload operation interface includes a plurality of reference images, and/or, video upload controls. When the upload control is triggered, multiple reference images of reference objects captured under multiple reference world coordinates under preset shooting conditions can be uploaded.
- the processing unit 720 executes the calibration and verification process of the internal camera parameters in this embodiment in the background, determines the first coordinate change parameters corresponding to multiple reference world coordinates according to preset shooting conditions, and determines the first coordinate change parameters corresponding to multiple reference world coordinates according to a preset algorithm.
- the second coordinate change parameter and when it is judged that the second coordinate change parameter is consistent with the first coordinate change parameter, a verification message that the calibration of the camera internal parameters is successful is generated.
- the result feedback unit 730 can directly display the verification result visually on the verification result display interface in a front-end visualization manner. For example, as shown in FIG. 8( b ), when it is verified that the second coordinate change parameter is consistent with the first coordinate change parameter, a verification message of “calibration successful” is displayed. Users can perform calibration and verification of camera parameters without mastering specific verification methods, which reduces the learning cost of calibration and verification of camera internal parameters, improves the efficiency of calibration and verification of camera internal parameters, and provides technology for large-scale calibration and verification of camera internal parameters support.
- the result feedback unit 730 may also directly display the verification result to the user directly in the form of a file package on the relevant interface.
- the large-scale operation of calibration and verification of camera internal parameters can be realized, so that the verification results can be intuitively displayed to users in the form of file packages.
- each verification result file package can contain a character mark whether the verification is successful, and after each verification result file package Both contain a download control, and the verification result file package can be downloaded through the download control.
- the verification result file package may include the second coordinate change parameter, the first coordinate change parameter, and the coordinate change parameter difference of the corresponding target camera.
- the verification result file package may be downloaded in response to the user's download request for the verification result file package.
- the calibration and verification system of camera internal parameters in the embodiment of the present disclosure interacts with users in the way of front-end visualization for calibration of camera internal parameters, and deploys the calibration and verification algorithm of camera internal parameters to the system end, which can realize the calibration and verification of camera internal parameters. Operation at scale.
- FIG. 9 is a schematic structural diagram of an apparatus for calibrating and verifying camera internal parameters provided by an embodiment of the present disclosure.
- the apparatus can be implemented by software and/or hardware, and can generally be integrated into electronic equipment for calibration and verification of camera internal parameters.
- the device includes: an acquisition module 910 , a determination module 920 , a judgment module 930 and a verification feedback module 940 .
- the acquisition module 910 is configured to acquire multiple reference images captured by the target camera under preset shooting conditions and multiple reference world coordinates, wherein the target camera has been calibrated with internal camera parameters.
- the determination module 920 is configured to determine first coordinate change parameters corresponding to multiple reference world coordinates according to preset shooting conditions, and determine second coordinate change parameters of multiple reference images according to a preset algorithm.
- a judging module 930 configured to judge whether the second coordinate change parameter is consistent with the first coordinate change parameter.
- the verification feedback module 940 is configured to feed back a verification message that the calibration of the camera internal parameters is successful when the second coordinate change parameter is consistent with the first coordinate change parameter.
- the camera internal reference calibration and verification device provided in the embodiments of the present disclosure can execute the camera internal reference calibration and verification method provided in any embodiment of the present disclosure, and has corresponding functional modules and beneficial effects for executing the method.
- the present disclosure further proposes a computer program product, including computer programs/instructions, and when the computer programs/instructions are executed by a processor, the method for calibrating and verifying camera intrinsic parameters in the above embodiments is implemented.
- the present disclosure further proposes a computer program, including: instructions, which, when executed by a processor, cause the processor to execute the method for calibrating and verifying camera intrinsic parameters in the above embodiments.
- FIG. 10 is a schematic structural diagram of an electronic device provided by an embodiment of the present disclosure.
- FIG. 10 it shows a schematic structural diagram of an electronic device 1000 suitable for implementing an embodiment of the present disclosure.
- the electronic device 1000 in the embodiment of the present disclosure may include, but not limited to, mobile phones, notebook computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Tablet Computers), PMPs (Portable Multimedia Players), vehicle-mounted terminals ( Mobile terminals such as car navigation terminals) and stationary terminals such as digital TVs, desktop computers and the like.
- the electronic device shown in FIG. 10 is only an example, and should not limit the functions and application scope of the embodiments of the present disclosure.
- an electronic device 1000 may include a processing device (such as a central processing unit, a graphics processing unit, etc.) 1001, which may be randomly accessed according to a program stored in a read-only memory (ROM) 1002 or loaded from a storage device 1008.
- a processing device such as a central processing unit, a graphics processing unit, etc.
- RAM memory
- various appropriate actions and processes are executed by programs in the memory (RAM) 1003 .
- RAM 1003 In the RAM 1003, various programs and data necessary for the operation of the electronic device 1000 are also stored.
- the processing device 1001, ROM 1002, and RAM 1003 are connected to each other through a bus 1004.
- An input/output (I/O) interface 1005 is also connected to the bus 1004 .
- the following devices can be connected to the I/O interface 1005: input devices 1006 including, for example, a touch screen, touchpad, keyboard, mouse, camera, microphone, accelerometer, gyroscope, etc.; including, for example, a liquid crystal display (LCD), speaker, vibration an output device 1007 such as a computer; a storage device 1008 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009.
- the communication means 1009 may allow the electronic device 1000 to perform wireless or wired communication with other devices to exchange data. While FIG. 10 shows electronic device 1000 having various means, it is to be understood that implementing or having all of the means shown is not a requirement. More or fewer means may alternatively be implemented or provided.
- embodiments of the present disclosure include a computer program product, which includes a computer program carried on a non-transitory computer readable medium, where the computer program includes program code for executing the method shown in the flowchart.
- the computer program may be downloaded and installed from a network via the communication means 1009, or from the storage means 1008, or from the ROM 1002.
- the processing device 1001 the above-mentioned functions defined in the method for calibration and verification of camera intrinsic parameters in the embodiment of the present disclosure are executed.
- the above-mentioned computer-readable medium in the present disclosure may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two.
- a computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to, electrical connections with one or more wires, portable computer diskettes, hard disks, random access memory (RAM), read-only memory (ROM), erasable Programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination of the above.
- a computer-readable storage medium may be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.
- a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave carrying computer-readable program code therein. Such propagated data signals may take many forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the foregoing.
- a computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium, which can transmit, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device .
- Program code embodied on a computer readable medium may be transmitted by any appropriate medium, including but not limited to wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.
- the client and the server can communicate using any currently known or future network protocols such as HTTP (HyperText Transfer Protocol, Hypertext Transfer Protocol), and can communicate with digital data in any form or medium
- HTTP HyperText Transfer Protocol
- the communication eg, communication network
- Examples of communication networks include local area networks (“LANs”), wide area networks (“WANs”), internetworks (e.g., the Internet), and peer-to-peer networks (e.g., ad hoc peer-to-peer networks), as well as any currently known or future developed network of.
- the above-mentioned computer-readable medium may be included in the above-mentioned electronic device, or may exist independently without being incorporated into the electronic device.
- the above-mentioned computer-readable medium carries one or more programs, and when the above-mentioned one or more programs are executed by the electronic device, the electronic device: acquires multiple reference world coordinates of the target camera under preset shooting conditions Multiple reference images taken, in which the target camera has been calibrated with camera internal parameters; the first coordinate change parameters corresponding to multiple reference world coordinates are determined according to preset shooting conditions, and the second coordinate changes of multiple reference images are determined according to a preset algorithm parameter; determine whether the second coordinate change parameter is consistent with the first coordinate change parameter; if the second coordinate change parameter is consistent with the first coordinate change parameter, feedback a verification message that the camera internal parameter calibration is successful.
- the calibration and verification of the camera's internal parameters are decoupled to improve the accuracy of the calibration and verification of the camera's internal parameters, and the calibration and verification of the camera's internal parameters are automatically performed, providing technical support for the efficiency of the camera's internal reference calibration.
- Computer program code for carrying out operations of the present disclosure may be written in one or more programming languages, or combinations thereof, including but not limited to object-oriented programming languages such as Java, Smalltalk, C++, and Included are conventional procedural programming languages, such as the "C" language or similar programming languages.
- the program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server.
- the remote computer may be connected to the user computer through any kind of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g. via the Internet using an Internet Service Provider). .
- LAN local area network
- WAN wide area network
- Internet Service Provider e.g. via the Internet using an Internet Service Provider.
- each block in a flowchart or block diagram may represent a module, program segment, or portion of code that contains one or more logical functions for implementing specified executable instructions.
- the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved.
- each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations can be implemented by a dedicated hardware-based system that performs the specified functions or operations , or may be implemented by a combination of dedicated hardware and computer instructions.
- the units involved in the embodiments described in the present disclosure may be implemented by software or by hardware. Wherein, the name of a unit does not constitute a limitation of the unit itself under certain circumstances.
- FPGAs Field Programmable Gate Arrays
- ASICs Application Specific Integrated Circuits
- ASSPs Application Specific Standard Products
- SOCs System on Chips
- CPLD Complex Programmable Logical device
- a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or device.
- a machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium.
- a machine-readable medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing.
- machine-readable storage media would include one or more wire-based electrical connections, portable computer discs, hard drives, random access memory (RAM), read only memory (ROM), erasable programmable read only memory (EPROM or flash memory), optical fiber, compact disk read only memory (CD-ROM), optical storage, magnetic storage, or any suitable combination of the foregoing.
- RAM random access memory
- ROM read only memory
- EPROM or flash memory erasable programmable read only memory
- CD-ROM compact disk read only memory
- magnetic storage or any suitable combination of the foregoing.
- the present disclosure provides a method for calibration and verification of camera internal parameters, including: Acquiring multiple reference images captured by the target camera under preset shooting conditions and multiple reference world coordinates , wherein, the target camera has been calibrated with internal camera parameters; the first coordinate change parameters corresponding to the plurality of reference world coordinates are determined according to the preset shooting conditions, and the second coordinate change parameters of the plurality of reference images are determined according to a preset algorithm Coordinate change parameter; judging whether the second coordinate change parameter is consistent with the first coordinate change parameter; and if the second coordinate change parameter is consistent with the first coordinate change parameter, feedback that the calibration of the internal camera parameters is successful verification message.
- the method further includes: before acquiring the multiple reference images taken by the target camera under preset shooting conditions and multiple reference world coordinates, passing the target The camera shoots a calibration image of a preset calibration object, wherein the preset calibration object includes a calibration point; obtains the standard world coordinates of the calibration point, and the image coordinates of the calibration point in the calibration image; and according to the The camera internal parameters are calculated based on the standard world coordinates and the image coordinates.
- the preset shooting condition includes: a coordinate change condition of at least one preset dimension of the plurality of reference world coordinates.
- the coordinate change condition includes: a condition that the coordinate value of the preset dimension is fixed; or a condition that the coordinate value of the preset dimension increases according to the same incremental value.
- the first coordinate change parameters corresponding to the plurality of reference world coordinates are determined according to preset shooting conditions
- the second coordinates of the plurality of reference images are determined according to a preset algorithm changing the parameters, including: calculating a plurality of first coordinate values of the plurality of preset world coordinates in preset dimensions according to the preset shooting conditions, and determining the plurality of first coordinate values of the preset dimensions in the The first coordinate change parameter; and calculating a plurality of second coordinate values of the plurality of reference images in the preset dimension according to a preset algorithm, and determining the second coordinates of the plurality of second coordinate values of the preset dimension Variation parameters.
- the judging whether the second coordinate change parameter is consistent with the first coordinate change parameter includes: determining according to a plurality of first coordinate values in the preset dimension a first coordinate change function; determining a second coordinate change function according to a plurality of second coordinate values in the preset dimension; and judging whether the first coordinate change function is consistent with the second coordinate change function.
- the first coordinate change parameters corresponding to the plurality of reference world coordinates are determined according to preset shooting conditions
- the second coordinates of the plurality of reference images are determined according to a preset algorithm
- the change parameter includes: determining a plurality of standard imaging areas corresponding to the plurality of reference world coordinates of the shooting reference object under the preset shooting conditions, and determining the plurality of standard imaging areas as the first coordinate change parameter and determining a plurality of actual imaging areas of the shooting reference object in the plurality of reference images, and determining the plurality of actual imaging areas as the second coordinate change parameter.
- the judging whether the second coordinate change parameter is consistent with the first coordinate change parameter includes: determining a first area change function according to the plurality of standard imaging areas; determining a second area change function according to the plurality of actual imaging areas; and judging whether the first area change function is consistent with the second area change function.
- the method further includes: after determining whether the second coordinate change parameter is consistent with the first coordinate change parameter, if the second coordinate change parameter is consistent with the first coordinate change parameter If the first coordinate change parameter is inconsistent, calculate the coordinate change parameter difference between the second coordinate change parameter and the first coordinate change parameter; and correct the internal camera parameters according to the coordinate change parameter difference.
- the acquiring multiple reference images captured by the target camera under preset shooting conditions at multiple reference world coordinates includes: acquiring all the images uploaded by the user through a preset calibration verification system The plurality of reference images, and/or, a video containing the plurality of reference images.
- the method further includes: using the calibration verification system to display a calibration verification result file package of camera intrinsic parameters corresponding to the multiple reference images, wherein the verification result file package including the comparison result between the second coordinate change parameter and the first coordinate change parameter; and downloading the verification result file package in response to a download request of the user for the verification result file package.
- the present disclosure provides a device for calibration and verification of camera internal parameters, including: an acquisition module, used to acquire the shooting conditions of the target camera under the preset shooting conditions of multiple reference world coordinates multiple reference images, wherein the target camera has been calibrated with camera internal parameters; the determination module is configured to determine the first coordinate change parameters corresponding to the multiple reference world coordinates according to the preset shooting conditions, and to Determining the second coordinate change parameters of the multiple reference images; a judging module, configured to determine whether the second coordinate change parameters are consistent with the first coordinate change parameters; When the coordinate change parameter is consistent with the first coordinate change parameter, a verification message is fed back that the camera intrinsic parameters are calibrated successfully.
- an acquisition module used to acquire the shooting conditions of the target camera under the preset shooting conditions of multiple reference world coordinates multiple reference images, wherein the target camera has been calibrated with camera internal parameters
- the determination module is configured to determine the first coordinate change parameters corresponding to the multiple reference world coordinates according to the preset shooting conditions, and to Determining the second coordinate change parameters of the multiple reference images
- the camera internal reference calibration and verification device further includes: a calibration module, configured to: take a calibration image of a preset calibration object through the target camera, wherein the The preset calibration object includes a calibration point; obtain the standard world coordinates of the calibration point, and the image coordinates of the calibration point in the calibration image; and calculate the camera internal parameters according to the standard world coordinates and the image coordinates .
- a calibration module configured to: take a calibration image of a preset calibration object through the target camera, wherein the The preset calibration object includes a calibration point; obtain the standard world coordinates of the calibration point, and the image coordinates of the calibration point in the calibration image; and calculate the camera internal parameters according to the standard world coordinates and the image coordinates .
- the preset shooting conditions include: coordinate change conditions of at least one preset dimension of the plurality of reference world coordinates.
- the coordinate change conditions include: the condition that the coordinate values of the preset dimensions are fixed; or, the preset dimensions The coordinate values of are incremented according to the condition of the same increment value.
- the determination module is specifically configured to: calculate the plurality of preset world coordinates according to the preset shooting conditions Set a plurality of first coordinate values of the dimension, and determine the plurality of first coordinate values of the preset dimension as the first coordinate change parameter; and calculate the plurality of reference images according to a preset algorithm in the preset a plurality of second coordinate values of the dimension, and determine a second coordinate change parameter of the plurality of second coordinate values of the preset dimension.
- the judging module is specifically configured to: determine the first A coordinate change function; determining a second coordinate change function according to a plurality of second coordinate values in the preset dimension; and judging whether the first coordinate change function is consistent with the second coordinate change function.
- the determination module is specifically used to: A plurality of standard imaging areas corresponding to world coordinates, and determining the plurality of standard imaging areas as the first coordinate change parameter; and determining a plurality of actual imaging areas of the shooting reference object in the plurality of reference images, And determining the plurality of actual imaging areas as the second coordinate change parameter.
- the judging module is specifically configured to: determine the first area change function according to the multiple standard imaging areas; the plurality of actual imaging areas, determine a second area change function; and judge whether the first area change function is consistent with the second area change function.
- the device for calibration and verification of camera intrinsic parameters further includes: a calculation module, configured to, when the second coordinate change parameter is inconsistent with the first coordinate change parameter, calculating a coordinate change parameter difference between the second coordinate change parameter and the first coordinate change parameter; and a correction module, configured to correct the camera internal parameters according to the coordinate change parameter difference.
- the device for calibration and verification of internal camera parameters provided in the present disclosure further includes: an upload module, configured to acquire the multiple reference images uploaded by the user through a preset calibration verification system, and /or, a video containing the multiple reference images.
- the device for calibration and verification of camera internal parameters further includes: a download module, configured to display the camera internal parameters corresponding to the multiple reference images through the calibration verification system Calibrate the verification result file package, wherein the verification result file package includes the comparison result between the second coordinate change parameter and the first coordinate change parameter, and download the verification result file package in response to the user’s download request The verification result file package.
- a download module configured to display the camera internal parameters corresponding to the multiple reference images through the calibration verification system Calibrate the verification result file package, wherein the verification result file package includes the comparison result between the second coordinate change parameter and the first coordinate change parameter, and download the verification result file package in response to the user’s download request The verification result file package.
- the present disclosure provides an electronic device, including: a processor; a memory for storing instructions executable by the processor; The executable instructions are read and executed to implement any method for calibrating and verifying camera internal parameters as provided in the present disclosure.
- the present disclosure provides a computer-readable storage medium, the storage medium stores a computer program, and the computer program is used to execute any camera described in the present disclosure. Calibration verification method for internal reference.
- the present disclosure provides a computer program, including: instructions, which when executed by a processor cause the processor to execute any one of the camera programs provided in the present disclosure. Calibration verification method for internal reference.
- the present disclosure is a computer program product, including instructions, which, when executed by a processor, cause the processor to perform any one of the camera internal parameters as provided in the present disclosure. Calibration verification method.
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Abstract
Description
Claims (18)
- 一种相机内参的标定验证方法,包括:获取目标相机在预设拍摄条件下的多个参考世界坐标的条件下拍摄的多张参考图像,其中,所述目标相机已标定相机内参;根据所述预设拍摄条件确定所述多个参考世界坐标对应的第一坐标变化参量,并根据预设算法确定所述多张参考图像的第二坐标变化参量;判断所述第二坐标变化参量与所述第一坐标变化参量是否一致;和若所述第二坐标变化参量与所述第一坐标变化参量一致,则反馈所述相机内参标定成功的验证消息。
- 如权利要求1所述的方法,还包括:在所述获取目标相机在预设拍摄条件下的多个参考世界坐标的条件下拍摄的多张参考图像之前,通过所述目标相机拍摄预设标定物的标定图像,其中,所述预设标定物包括标定点;获取所述标定点的标准世界坐标,以及所述标定点在所述标定图像中的图像坐标;和根据所述标准世界坐标和所述图像坐标计算所述相机内参。
- 如权利要求1所述的方法,其中,所述预设拍摄条件包括:所述多个参考世界坐标的至少一个预设维度的坐标变化条件。
- 如权利要求3所述的方法,其中,所述坐标变化条件,包括:所述预设维度的坐标值固定的条件;或,所述预设维度的坐标值根据相同递增值递增的条件。
- 如权利要求1所述的方法,其中,所述根据预设拍摄条件确定所述多个参考世界坐标对应的第一坐标变化参量,并根据预设算法确定所述多张参考图像的第二坐标变化参量,包括:根据所述预设拍摄条件计算所述多个预设世界坐标在预设维度的多个第一坐标 值,并确定所述预设维度的多个第一坐标值为所述第一坐标变化参量;和根据预设算法计算所述多张参考图像在所述预设维度的多个第二坐标值,并确定所述预设维度的多个第二坐标值的第二坐标变化参量。
- 如权利要求5所述的方法,其中,所述判断所述第二坐标变化参量与所述第一坐标变化参量是否一致,包括:根据所述预设维度下的多个第一坐标值,确定第一坐标变化函数;根据所述预设维度下的多个第二坐标值,确定第二坐标变化函数;和判断所述第一坐标变化函数和所述第二坐标变化函数是否一致。
- 如权利要求1所述的方法,其中,所述根据预设拍摄条件确定所述多个参考世界坐标对应的第一坐标变化参量,并根据预设算法确定所述多张参考图像的第二坐标变化参量,包括:确定拍摄参考物在所述预设拍摄条件下与所述多个参考世界坐标对应的多个标准成像面积,并确定所述多个标准成像面积为所述第一坐标变化参量;和确定所述拍摄参考物在所述多张参考图像中的多个实际成像面积,并确定所述多个实际成像面积为所述第二坐标变化参量。
- 如权利要求7所述的方法,其中,所述判断所述第二坐标变化参量与所述第一坐标变化参量是否一致,包括:根据所述多个标准成像面积,确定第一面积变化函数;根据所述多个实际成像面积,确定第二面积变化函数;和判断所述第一面积变化函数和所述第二面积变化函数是否一致。
- 如权利要求1所述的方法,还包括:在所述判断所述第二坐标变化参量与所述第一坐标变化参量是否一致之后,若所述第二坐标变化参量与所述第一坐标变化参量不一致,则计算所述第二坐标变化参量与所述第一坐标变化参量的坐标变化参量差值;和根据所述坐标变化参量差值修正所述相机内参。
- 如权利要求1所述的方法,其中,所述获取目标相机在预设拍摄条件下的多个参考世界坐标下拍摄的多张参考图像,包括:获取用户通过预设的标定验证系统上传的所述多张参考图像,和/或,包含所述多张参考图像的视频。
- 如权利要求10所述的方法,还包括:通过所述标定验证系统显示与所述多张参考图像对应的相机内参的标定验证结果文件包,其中,所述验证结果文件包中包括所述第二坐标变化参量与所述第一坐标变化参量的比较结果;和响应于用户对所述验证结果文件包的下载请求,下载所述验证结果文件包。
- 一种相机内参的标定验证装置,包括:获取模块,用于获取目标相机在预设拍摄条件下的多个参考世界坐标的条件下拍摄的多张参考图像,其中,所述目标相机已标定相机内参;确定模块,用于根据所述预设拍摄条件确定所述多个参考世界坐标对应的第一坐标变化参量,并根据预设算法确定所述多张参考图像的第二坐标变化参量;判断模块,用于判断所述第二坐标变化参量与所述第一坐标变化参量是否一致;和验证反馈模块,用于在所述第二坐标变化参量与所述第一坐标变化参量一致时,反馈所述相机内参标定成功的验证消息。
- 一种相机内参的标定验证系统,包括:上传单元,用于接收用户在所述标定验证系统上传的多张参考图像,和/或,包含所述多张参考图像的视频,其中,所述多张参考图像是已标定相机内参的目标相机,在预设的拍摄条件下的多个参考世界坐标的条件下拍摄的;处理单元,用于根据所述预设拍摄条件确定所述多个参考世界坐标对应的第一坐标变化参量,并根据预设算法确定所述多张参考图像的第二坐标变化参量,并在判断所述第二坐标变化参量与所述第一坐标变化参量一致时生成所述相机内参标定成功的验证消息;和结果反馈单元,用于反馈所述验证消息。
- 如权利要求13所述的系统,其中,所述结果反馈单还用于:显示所述验证消息对应的验证结果文件包,其中,所述验证结果文件包中包括所述第二坐标变化参量与所述第一坐标变化参量的比较结果;和响应于用户对所述验证结果文件包的下载请求,下载所述验证结果文件包。
- 一种电子设备,包括:处理器;和用于存储所述处理器可执行指令的存储器;所述处理器,用于从所述存储器中读取所述可执行指令,并执行所述指令以实现上述权利要求1-11中任一所述的相机内参的标定验证方法。
- 一种计算机可读存储介质,所述存储介质存储有计算机程序,所述计算机程序用于执行上述权利要求1-11中任一所述的相机内参的标定验证方法。
- 一种计算机程序,包括:指令,所述指令当由处理器执行时使所述处理器执行根据权利要求1-11中任一项所述的相机内参的标定验证方法。
- 一种计算机程序产品,包括指令,所述指令当由处理器执行时使所述处理器执行根据权利要求1-11中任一项所述的相机内参的标定验证方法。
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