38 results about "Reference alignment" patented technology

The invention discloses a mobile robot accurate docking method based on edge calculation, and aims to solve the problems that the dynamic docking precision is reduced and the collision risk is increased due to micro-motion or drifting of a target station. According to the method, unified time reference alignment is carried out on data of a camera, a laser radar, an inertial measurement unit, an ultra-wideband range finder, a station encoder and a programmable logic controller at an edge node, and a three-dimensional special Euclidean group equivariant multi-source fusion network is used for outputting relative pose estimation and covariance; the estimation in the time window is further used as a condition to be input into a conditional diffusion short-time prediction model to obtain a time-varying mean value and a time-varying covariance, an anisotropic probability tube is constructed, and prediction-measurement joint correction is carried out based on a score function; scenarized opportunity constraints are constructed under correction probability tube constraints, a tubular nonlinear model is adopted to predict, control and solve a reference trajectory, an actuator command is generated in combination with depth visual servo and compliance control, and the technical effects of high precision, robustness and safe docking under the station dynamic disturbance condition are achieved.

The invention discloses an adjustable self-centering drilling device which comprises an adjusting screw rod and an adjusting cone, and the bottom end of the adjusting screw rod is fixedly connected with the adjusting cone; a center hole is formed in the center of the adjusting cone and used for allowing the spring fixing rod to penetrate. A groove gap is formed in the side part of the adjusting cone and is communicated with the central hole; a threaded hole is formed in the base, and the adjusting screw rod penetrates through the threaded hole and can move up and down; a plurality of positioning holes are formed in the base and used for allowing a drilling tool to penetrate through; the fixed cover is fixedly connected with the base; a through hole is formed in the fixed cover; the periphery of the fixed cover is sleeved with a to-be-machined workpiece; one end of the telescopic rod is provided with a boss which is used for being inserted into the edge of the groove gap and can slide, and the other end of the telescopic rod penetrates through the through hole and is fixedly connected with the telescopic supporting head; one end of the telescopic spring is connected with the spring fixing rod, and the other end of the telescopic spring is connected with the telescopic supporting head; by means of the device, machining of circumferential flange holes of a workpiece to be machined can be completed in a self-centering mode, and additional standard alignment is not needed.

The invention discloses a building construction safety monitoring method and system based on multi-source sensing fusion, and the method comprises the steps: firstly carrying out the precise space-time reference alignment of an original video stream and a UWB positioning data package, so as to solve the inherent asynchronism and conflict problems of heterogeneous sensor data, and guarantee the accuracy of subsequent data fusion; then, parallel feature extraction and preliminary entity association are carried out on the aligned data, and scene constraint-based dynamic confidence evaluation is carried out on a preliminary fusion object by innovatively utilizing BIM semantic data, so that priori knowledge of a building environment is fully utilized, and the reliability of sensor data is dynamically optimized; therefore, the defect of information loss caused by environmental influence, shielding or signal interference of a single sensor is overcome. And finally, the system performs adaptive fusion decision and state optimization according to the obtained confidence score, and outputs a high-confidence object state. In this way, the accuracy, the real-time performance and the reliability of building construction safety monitoring are remarkably improved.

The invention belongs to the field of computer vision, and provides a tilapia behavior image detection method, system and equipment, and the method comprises the steps: enabling the fish mouth feature vectors of a plurality of samples to form a feature matrix, generating a fish mouth feature alignment index matrix, and extracting a target alignment vector and a reference alignment vector; and respectively calculating the inner product of the alignment index vector of each sample, the target alignment vector and the reference alignment vector to obtain a target alignment score and a reference alignment score, taking the distance between the target alignment score and the reference alignment score as a behavior offset index, and mapping the behavior offset index as the probability of the parent hatch behavior. The method has natural robustness, can restrain the influence of accidental noise, can effectively recognize the female incubation behavior in the underwater complex environment, and has higher real-time response capability in actual aquaculture monitoring.

The invention discloses a measuring machine for detecting defects of a constant velocity universal joint component, and aims to solve the problems that the existing equipment is low in double-reference alignment efficiency, poor in precision and easy to be polluted and interfered. The device comprises a workbench with a center avoiding hole, a detection execution unit comprising a detachable contact type or laser measuring head, a motion driving unit driving the measuring head to move in a three-dimensional mode, a reference positioning unit comprising a double-vision assembly and a positioning adjusting assembly, an electric control unit and a cleaning auxiliary assembly. The electric control unit cooperates with the double-vision assembly to collect inner hole and outer circle references and controls the positioning adjusting assembly to finely adjust the position of a workpiece, and double-reference alignment is achieved. The measuring machine can improve the positioning precision and efficiency, enhance the workpiece clamping stability and the equipment universality, reduce the detection error caused by pollution, and guarantee the reliable detection.

The invention relates to the technical field of artificial intelligence, and discloses a landscape garden surveying and mapping method based on artificial intelligence, and the method comprises the steps: 1, carrying an RGB camera, a laser radar and a multispectral sensor through an unmanned plane, collecting the multi-modal data of a landscape garden, and supplementing the near-ground point cloud data through a ground mobile robot; step 2, carrying out space-time reference alignment on the multi-modal data acquired in the step 1 by adopting an ICP-SIFT mixed registration algorithm to generate registered multi-period data; and step 3, constructing a space-time-spectrum tensor based on a registration result in the step 2. The technical scheme of combining an ICP-SIFT mixed registration technology and hypergraph constraint tensor decomposition is adopted, the technical effect of sub-centimeter-level multi-modal data space-time alignment and high-order correlation fusion is achieved, and compared with the defects that in the prior art, a single registration algorithm is prone to noise interference, and tensor decomposition neglects ecological correlation, the method has the advantage that the method has the advantage of being high in adaptability. The problems of multi-source data registration error accumulation and cross-modal feature fusion distortion are solved.

The application relates to the technical field of surveying and mapping geographic information, and discloses a surveying and mapping intelligent analysis system based on multi-source data fusion, which comprises a multi-source acquisition and space-time reference alignment module, a factor graph consistency fusion and gate module and the like. The multi-source acquisition and space-time reference alignment module is configured to lock a main clock source through a hardware timing protocol, set a hard time alignment threshold, receive multi-source sensor data, judge a time synchronization deviation fed back by the sensor, and output original observation data flow when the time synchronization deviation is lower than the hard time alignment threshold. The factor graph consistency fusion and gate module is configured to receive the original observation data flow and build a global factor graph containing a full-source data constraint chain. The hardware timing protocol locking and hard time alignment threshold mechanism are adopted to establish a unified space-time reference at a physical level from the source, eliminate spatial misplacement caused by sensor sampling differences, realize high-precision consistency fusion of multi-source data, and solve the problems of difficulty in determining deviation sources and low fusion efficiency in traditional technologies.

This invention relates to an image processing apparatus, a camera device, and an image processing method. The image processing apparatus is capable of obtaining high-definition images by reducing alignment errors in multiple images. The image processing apparatus includes: an alignment unit for performing sequential alignment and reference alignment, the sequential alignment being used to align adjacent images, and the reference alignment being used to align images other than a reference image to a reference image; and a control unit for controlling the alignment unit to align multiple images including the same subject, captured sequentially in a time sequence by a camera unit, by combining the sequential alignment and the reference alignment.

The application provides a moving platform passive reference self-construction method based on scene features, which comprises the following steps: based on the two-dimensional image coordinates of each cooperative mark in two images and the three-dimensional world coordinates of each cooperative mark in a reference coordinate system, completing the preliminary camera external parameter estimation corresponding to the two images; combining the preliminary camera external parameter estimation results of the two images, performing triangulation on all homonymous feature point pairs in the two images, estimating the preliminary three-dimensional coordinates of the three-dimensional space feature points corresponding to each homonymous feature point pair, and generating an initial three-dimensional point cloud of the scene; constructing a re-projection error objective function based on the preliminary three-dimensional coordinates of the three-dimensional space feature points and the image coordinates of the three-dimensional space feature points in the image planes of the two images and solving the re-projection error objective function, obtaining the optimized camera external parameter estimation results and the scene point cloud; and performing pose estimation based on the optimized scene point cloud, so as to realize the reference alignment of the moving platform.

The invention discloses a method for using a reference ball as a normal machining reference, and belongs to the field of machining of automobile manufacturing. According to the method, a datum hole is machined in the surface of a to-be-machined workpiece, a datum ball is installed, contact type measurement is used for determining machine tool coordinate system coordinates of the center of the datum ball, and then multi-axis numerical control machining is conducted with the center coordinates as the machining datum. The specific operation comprises the steps that a reference hole perpendicular to the bottom plane is machined in the surface of a workpiece, then a reference ball is installed in the hole to form a spherical measuring face, then a dial indicator slides on the surface of the reference ball to complete reference alignment of the X axis, the Y axis and the Z axis, and finally multi-axis numerical control machining is conducted with the determined sphere center coordinates as the reference. The method can effectively eliminate the reference conversion error, improve the normal machining precision, simplify the machining process, reduce the machining interference risk, improve the tool setting efficiency and verify the normal machining precision of the numerical control milling equipment, and has remarkable beneficial effects.

The application discloses a sprocket machining reference alignment method based on machine vision, and relates to the technical field of intelligent manufacturing.The method is based on the full-image imaging of the front view section of a to-be-detected sprocket obtained by a machine vision method, and performs intelligent size analysis, so that the machining deviation of the to-be-detected sprocket is determined to determine whether the to-be-detected sprocket is qualified, and the qualified to-be-detected sprocket is intelligently matched with a machining baseline template, angular positioning is realized, and machining baseline positioning information is output, so that automatic reference alignment is realized, and intelligent detection support is provided for a full-automatic large sprocket machining process.

This invention discloses a method, apparatus, and related products for measuring the tilt angle of a camera assembly, relating to the field of camera inspection technology. The method includes: acquiring reference alignment parameters; establishing a parallel reference relationship between the device's reference edge and a parallel calibration line on a calibration medium to complete test reference calibration; acquiring a preview image of the parallel calibration line; superimposing an angle reference line with a preset tilt angle onto the preview image to generate an angle comparison view; extracting the imaging features of the parallel calibration line from the angle comparison view; and comparing and analyzing the imaging features with the angle reference line to obtain the camera assembly tilt angle. This solution improves inspection efficiency, reduces costs, and enhances compatibility.

The present invention relates to a recipe generation method of an overlay measurement device, and more particularly to a recipe generation method including a reference alignment mark image. The present invention provides a recipe generation method that automatically generates a recipe of an overlay measurement device, the recipe generation method including: a step of obtaining an optimal parameter candidate group; a step of setting the overlay measurement device with an existing parameter group; a step of locating an alignment mark within a measurement range of the overlay measurement device set with the existing parameter group using an existing reference alignment mark image; a step of setting the overlay measurement device with the optimal parameter candidate group; a step of obtaining a new reference alignment mark image corresponding to the optimal parameter candidate group by photographing the alignment mark using the overlay measurement device set with the optimal parameter candidate group; and a step of generating an optimal candidate recipe including the optimal parameter candidate group and the new reference alignment mark image.

The invention provides a cultural heritage digital replication and augmented reality integration method and system and related equipment. The method comprises the following steps: establishing three layers of reference alignment data; the three-layer benchmark alignment data comprises a structure layer benchmark, a process layer benchmark and a semantic layer benchmark which are stored in a unified coordinate system; acquiring field observation data at the head-mounted terminal based on the three-layer reference alignment data, wherein the field observation data comprises structure observation data, process fingerprint observation data and semantic observation data; joint solving is carried out on the pose parameters of the field observation data under the unified coordinate system; the combined solution adopts a structure constraint formed by a structure layer reference and structure observation data, a process fingerprint constraint formed by a process layer reference and process fingerprint observation data, and a semantic locking constraint formed by a semantic layer reference and semantic observation data; and updating the three-layer reference alignment data based on the pose parameter and process fingerprint matching relation of the joint solution.

This invention discloses a reference rework method for large-size molds. Four reference blocks are respectively attached to the first and second machining areas of the mold. On machine tool one, alignment is performed based on the original reference surface and original reference holes of the mold to be reworked. After alignment, the midpoint between the two original reference holes in the machining area of ​​station one is used as the origin of the machining coordinate system. Transformation reference holes are machined on the two reference blocks in the machining area of ​​station two. The top surfaces of the four reference blocks are milled into transformation reference surfaces, and the coordinate positions of the transformation reference holes are recorded. The mold to be reworked is transferred to machine tool two to level the transformation reference surface. The center of the original reference hole in the machining area of ​​station one is used as the origin of the machining coordinate system for that area. After machining, the mold is rotated 180 degrees; the transformation reference surface is leveled; after leveling, the coordinate positions of the transformation reference holes are input into machine tool two to construct the machining coordinate system for the machining area of ​​station two. This invention provides more accurate reference alignment and increases the safety of mold rework.

The invention discloses an online testing system for full life cycle performance decline of a reciprocating pump, and particularly relates to the technical field of reciprocating pump state monitoring. A dynamic feature matching module identifies working conditions and outputs a fault feature set; the weak signal enhancement module enhances and extracts nonlinear weak fault features from the original signal and outputs an enhanced feature signal; the coupling and decoupling analysis module performs multi-source decoupling on the enhanced signal and outputs an independent fault characteristic value sequence and a fault propagation path; the full life cycle mapping module generates a health state quantitative index according to the sequence and the path; the reference alignment module carries out dynamic space-time reference alignment and outputs an aligned track geometric data set; the dynamic feature matching module adapts to working condition changes, early weak faults are extracted through the weak signal enhancement module, multi-cylinder interference is separated through the coupling decoupling and mapping module, the health state is quantified, and online testing of full-life periodic performance decline of the reciprocating pump is achieved.

This invention discloses a method and system for modeling vehicle door structures, relating to the field of automotive design technology. The method includes: determining the large glass surface based on the glass boundary of the door window frame; calling a library of standard door cross-sections with predefined standard cross-sectional references based on the door structure; determining design cross-sectional references for each standard cross-section based on the door structure design parameters; adjusting the standard cross-sectional references to the design cross-sectional references to determine the design position of each cross-section; and generating a door structure model based on all determined cross-sectional positions. This invention achieves rapid and standardized modeling of vehicle door structures through parametric and automated cross-sectional reference alignment and positioning, reducing repetitive manual work, improving design efficiency and consistency, and enabling early verification and optimization of key designs such as hinge arrangement. The system includes corresponding functional modules to implement the method.

The utility model belongs to the technical field of diamond grinding wheels, in particular to a protective cover capable of adjusting the grinding position of a diamond grinding wheel, which comprises a diamond grinding wheel protective cover and a connecting sleeve, a loading positioning plate is arranged on one side of the diamond grinding wheel protective cover, and a supporting rod is fixedly connected to the bottom end of the loading positioning plate. The bottom end of the supporting rod is rotationally connected with an adjusting screw rod, the outer wall of the adjusting screw rod is in threaded connection with an adjusting supporting plate, the bottom end of the material loading positioning plate is fixedly connected with a transparent plastic plate, and reference scales are arranged on the outer wall of the transparent plastic plate. The horizontal position of a material loading positioning plate can be adjusted through cooperation of a supporting rod, an adjusting screw rod and an adjusting supporting plate, and a worker can accurately adjust the to-be-polished position of a workpiece to correspond to the vertical tangent position of a diamond grinding wheel in cooperation with reference alignment of a reference scale on a transparent plastic plate and the edge of the adjusting supporting plate; and the diamond grinding wheel is prevented from abrading the peripheral positions of workpiece burrs.

The invention relates to a machining method for a special-shaped double-layer cooling structure part with a zero-allowance appearance, and belongs to the technical field of machining. The machining method of the special-shaped double-layer cooling structure part with the allowance-free appearance comprises the steps that allowance is reserved at the butt joint and matching position in a 3D printing handover state, the allowance is 3-5 mm, four reference blocks are reserved on the front end face and the rear end face of the part, and theoretical end face lines are printed on the front end face and the rear end face; appearance inspection; marking by a bench worker, performing three-dimensional scanning on the part, finding out theoretical positions of each reference block in the horizontal and vertical directions according to a three-dimensional scanning allowance result, leveling the horizontal and vertical directions respectively, and finding out a theoretical horizontal plane and a theoretical vertical plane in a centering manner; numerical control machining is conducted, the part is vertically clamped through lap joint of a pressing plate, a cushion block and a screw, and benchmark alignment is conducted; before machining, an internal channel is blocked; and after machining, an internal channel is cleaned and dried, the datum alignment efficiency is improved, part machining can be smoothly completed, and the part machining quality is guaranteed.

The invention discloses a vertical heat treatment and reference reconstruction integrated process for a carburized and quenched gear, and belongs to the technical field of machine manufacturing. Comprising the following steps: carrying out vertical racking carburizing and quenching on a gear workpiece subjected to hobbing in an axis vertical posture, and controlling the distance between the workpieces through a quantification formula so as to inhibit deformation; after quenching, centering by taking the pitch circle of the tooth part as a reference, determining the number of centering points and a precision threshold value through an optimization formula, and reconstructing a high-precision center hole; and finally, finish machining is conducted on the basis of the reconstructed standard, and the grinding allowance is dynamically optimized according to actually-measured deformation data. The special tool system comprises an adjustable vertical racking module and a reference alignment module of an integrated controller, and is used for automatically executing the process.

Provided are an image inspection device and an image inspection method capable of determining an actual image-capturing angle with respect to a workpiece. An image inspection device (1) is characterized by comprising: a mirror rotating body (12); an image-capturing unit (13); a positioning reference alignment unit that is provided to the mirror rotating body (12) so as to rotate integrally with the mirror rotating body (12) to be image-captured together with a workpiece; a drive unit (14) that drives rotation of the mirror rotating body (12); an image-capturing processing unit (151) that causes the drive unit (14) to drive the rotation of the mirror rotating body (12), and causes the image-capturing unit (13) to capture an image of the workpiece upon positioning of the mirror rotating body (12) at a preset setting angle; and an image-capturing angle acquisition unit (152) that acquires an actual image-capturing angle of a captured image corresponding to the setting angle on the basis of the alignment unit appearing in the captured image.

The invention relates to the technical field of surveying and mapping geographic information, and discloses a multi-source data fusion surveying and mapping intelligent analysis system, which comprises a multi-source acquisition and space-time reference alignment module configured to lock a main clock source through a hardware time service protocol, set a hard time alignment threshold value, receive multi-source sensor data and judge time synchronization deviation fed back by a sensor, outputting an original observation data stream when the time synchronization deviation is lower than a hard time alignment threshold value; and the factor graph consistency fusion and gating module is configured to receive the original observation data stream and construct a global factor graph containing an all-source data constraint chain. A hardware time service protocol locking and hard time alignment threshold mechanism is adopted, a unified space-time reference of a physical level is established from a source, spatial dislocation caused by sensor sampling difference is eliminated, high-precision consistency fusion of multi-source data is achieved, and the defects that a deviation source is not easy to judge and fusion efficiency is low in a traditional technology are overcome.

The invention discloses a manufacturing method of a multi-carrier probe card. The manufacturing method comprises the following steps: firstly, carrying out reference positioning and horizontal correction on a PCB (Printed Circuit Board); the second carrier is aligned and fixed on the PCB; next, the assembly is transferred to a needle adjusting device, and a standard reference point on an integrated glass mask fixed on the device is used as a unified space reference to accurately calibrate the second carrier; and finally, by taking the calibrated second carrier and the standard reference point as a common reference, sequentially carrying out step-by-step fine adjustment and fixation on the first carrier and the third carrier, so that the needle point and needle position deviation between the carriers is less than or equal to 10 microns. According to the method, the multi-stage positioning process of fixing the intermediate carrier, performing high-precision reference calibration and performing step-by-step reference alignment is established, so that error accumulation is effectively controlled, high-precision cooperative positioning among multiple carriers is realized, and the test precision and the product yield of the probe card are improved.

The application discloses a positioning device and method for circumferential reference alignment of upper and lower hill angle seats on a circular weft machine, specifically, a first measuring table for measuring the circumferential linear deviation of the middle seat is arranged on the outer side of the side wall of the inner part of the alignment adjusting device, the first measuring table is a digital measuring table, and at least has a measuring data display and initialization; the upper hill angle seat and the lower hill angle seat at the needle gate position are defined as a first upper hill angle seat and a first lower hill angle seat respectively, an alignment tool is installed on the first upper hill angle seat, the alignment tool comprises a fixing block and a measuring plate, the fixing block is fixed in the first upper hill angle seat, the measuring plate is integrally formed or separately fixed on the outer end of the fixing plate, the free end of the measuring plate points to the first lower hill angle seat, at least a first pair of mark points are arranged on the measuring plate, a second pair of mark points are arranged on the first lower hill angle seat, the alignment adjusting device is adjusted so that the first pair of mark points and the second pair of mark points are opposite to each other in position, and thus the circumferential reference alignment of the upper and lower hill angle seats is realized.

The present application relates to a method, apparatus, measuring device, system, and storage medium for measuring the play of a cotter pin. The method comprises: obtaining target three-dimensional point cloud data of a cotter pin of a bogie to be tested in a railway freight car; matching and fitting the target three-dimensional point cloud data with a standard CAD model based on a reference alignment algorithm and a best fit algorithm to obtain combined three-dimensional point cloud data; and performing point cloud gap width analysis on the combined three-dimensional point cloud data to obtain the play of the cotter pin of the bogie to be tested. This method can improve the efficiency and accuracy of measuring the play of the cotter pin of the bogie to be tested.

The application discloses a magnetic flux motor stator tooth processing method, a stator disc assembling process and an assembling tool; the application relates to the technical field of axial flux motors; the preset angle of the multi-station slotting jig is used for performing perpendicularity constraint on the processing plane of a workpiece and the main shaft of equipment. The No. 1 / No. 2 slotting jig 6 / 9 adopts a double-V-shaped guide rail design, three-point constraint is formed by using linear contact between the guide rail and the workpiece tooth shoe reference surface, and the translational degree of freedom t y / t z and the rotational degree of freedom r z are eliminated. When the workpiece is processed on one side tooth groove, the positioning groove of one jig in the multi-station slotting jig constrains the translational degree of freedom t y and the rotational degree of freedom r z of the workpiece. The multi-station modular design realizes automatic reference alignment through a geometric self-positioning structure, does not need external parameter calibration, avoids cumulative errors of segmented processing from the design source, and forms a natural unified electromagnetic working plane and angle reference in the processing stage through geometric self-positioning and pressure equalization design, thereby avoiding reference deviation in traditional segmented processing.

This application relates to the field of mold technology and discloses a quick mold replacement and reference alignment device, including a base. A multi-functional truss arm is fixedly connected to the upper part of the base. A worktable is fixedly connected to the upper left side of the base. A lower mold is arranged on the upper part of the worktable. An automatic centering structure is fixedly connected to the middle of the worktable. First anti-rotation mechanisms are fixedly connected to the left and right sides of the upper part of the worktable. A quick-change plate mechanism is fixedly connected to the lower part of the multi-functional truss arm. Parallel adjustment mechanisms are fixedly connected to the left and right sides of the lower part of the quick-change plate mechanism. An upper mold is arranged outside the quick-change plate mechanism. Second anti-rotation mechanisms are arranged on the left and right sides inside the upper mold. A crystal removal component is arranged on the upper right side of the base for further removing salt solution crystals. By changing the upper and lower molds through the multi-functional truss arm, automatic mold centering and quick switching are achieved, avoiding the risk of manual operation and contact with salt solution.

The present invention relates to a recipe generation method for an overlay measurement device and, more specifically, to a recipe generation method including a reference alignment mark image. The present invention provides the recipe generation method for automatically generating a recipe of an overlay measurement device, comprising the steps of: acquiring an optimal parameter candidate set; setting the overlay measurement device to an existing parameter set; using an existing reference alignment mark image so as to position an alignment mark within a measurement range of the overlay measurement device set to the existing parameter set; setting the overlay measurement device to the optimal parameter candidate set; acquiring a new reference alignment mark image corresponding to the optimal parameter candidate set by photographing the alignment mark with the overlay measurement device set to the optimal parameter candidate set; and generating an optimal candidate recipe including the optimal parameter candidate set and the new reference alignment mark image.

The application relates to a stepped curved surface grinding method and device of a tool, a numerical control machine and a storage medium. The method comprises the following steps: acquiring a target generatrix vector corresponding to a point on a reference alignment line of a stepped curved surface; offsetting the point on the reference alignment line by a distance corresponding to a preset relief angle along a preset direction to obtain a point on a target alignment line; determining a grinding point located on the target generatrix vector based on the point on the target alignment line to obtain a grinding track; and grinding the stepped curved surface of a workpiece to be processed based on the grinding track. The method can simplify the track calculation process and improve the grinding efficiency.

Examples herein describe alignment detection circuitry. The alignment detection circuitry includes a buffer, a first set of correlators, and a second set of correlators. The buffer is configured to output a data stream of multiplexed groups of symbols from multiple data lanes. The first set of correlators is configured to search a candidate data lane of the data stream for bits matching bits of a reference alignment marker based on a first search method. The second set of correlators is configured to search the candidate data lane of the data stream for bits matching the bits of the reference alignment marker based on a second search method.