184results about How to "Accurate splicing" patented technology

The invention discloses a measuring method for length, width and height of a vehicle based on an RGB-D camera. The method comprises the steps of acquiring a clear vehicle image in a camera short-distance mounting manner, calibrating the camera according to a calibrating method based on a disappearing point, obtaining an internal parameter and an external parameter of the camera, realizing three-dimensional point cloud conversion of a vehicle target in a world coordinate system through a camera depth image solution, and acquiring three-dimensional coordinate information of the external surfaceof the vehicle; acquiring the three-dimensional coordinate of the external surface of the vehicle by means of prior knowledge and an image processing method, splicing a vehicle image according to sequence patterns in a vehicle motion process through a registering method, and realizing three-dimensional measurement to the profile of the vehicle. The measuring method overcomes defects of high equipment requirement and tedious operation in a traditional method and realizes high calibration precision. The actual displacement of the vehicle is comprehensively analyzed through a matching relation ofpoints which correspond with the same position of the vehicle in the image sequence, thereby realizing relatively high registering precision. The measuring method further has advantages of realizingaccurate splicing of the vehicle side surfaces, reducing vehicle length measurement error and improving accuracy in splicing the vehicle side surfaces.

The invention discloses a fast image splicing method, which is characterized by comprising the following steps of: (1) acquiring a single-breadth field image; (2) extracting characteristic information in an image to be spliced; (3) performing two-dimensional wavelet transform on the image to be spliced to obtain high-frequency coefficients reflecting the profile of change in a horizontal direction and a vertical direction of the image, and realizing overlapped position alignment in combination with a phase correlation method; and (4) adopting a weighted mean method to fuse overlapped areas of the image to finish the splicing. In the method, low-energy coefficients reflecting the gradual change of illumination are removed by performing the two-dimensional wavelet transform on the image and then the high-frequency coefficients reflecting the profile of the change in the horizontal direction and the vertical direction of the image are obtained, which can effectively reduce calculation complexity; and simultaneously, the fast and accurate overlapped position alignment is realized in combination with the phase correlation method and the fusion of the image is realized by adopting the weighted mean method so as to realize the fast and accurate splicing of PCB images of various specifications and various colors.

The invention relates to an automatic cutting and grinding equipment for low-carbon steel pipes used for splicing building structure grids, which includes a supporting base plate, a cutting device, a clamping device, a grinding device and a fixing device, and a cutting device is installed on the top of the left end of the supporting base plate , the clamping device is installed on the top of the support base plate, the grinding device is connected with the middle part of the support base plate, and the fixing device is installed on the top right side of the support base plate. The present invention can solve the existing steel pipe welding problems that the steel pipe cannot be firmly fixed when the steel pipe is cut, the cut of the steel pipe after cutting is not neat, the cut of the steel pipe needs to be manually polished, the grinding effect of the cut of the steel pipe is poor, and the steel pipe needs to be manually polished before welding. The position of the steel pipe is corrected, and there will be errors in the position of the steel pipe after correction; it can realize the functions of cutting the steel pipe at a fixed angle, grinding the incision of the cut steel pipe, and accurately splicing the polished steel pipe together.

The invention discloses a circular seam laser welding fixture for a thin-wall cylinder, which comprises a head frame, an extended ring, a rear frame of a machine tool and a top plate. When in operation, the extended ring is placed between the head frame and the rear frame of the machine tool and sleeved in a place where two workpieces to be welded are spliced; one non-splicing end of the workpiece is retained and positioned on a spindle of the head frame while the other non-splicing end is attached to a positioning surface of a baffle; a top point of the rear frame of the machine tool is arranged in a top point hole of the baffle. By adopting a retractable extended ring, the invention realizes the correct splicing and retaining of the thin-wall cylinder; the gyration of the cylinder can be realized by a way that the head frame with the function of turning drives a head part of the cylinder and a tail part of the cylinder is supported by the rear frame and the top plate; meanwhile, the splicing precision also meets the requirement of the laser welding. A worm-and-gear mechanism of the spindle in the head frame can accomplish the precise gyration of the workpiece and the head frame with a turnover function is convenience for feeding and discharging of a longer workpiece. The invention has the advantages of precise positioning, reliable and convenient fixture, convenient application, high efficiency, etc.

The invention relates to a crack splicing method in bridge quality detection. The machine vision technology, modern sensing technology, data analysis processing technology, calculation technology canbe effectively fused into bridge quality detection. Aiming at the acquired local image of the crack; the splicing of crack images is accurately completed. The automatic detection of the whole crack ofthe bridge is met; the safe use of the bridge is ensured. Method of installing an installation device, Collecting crack images, Crack image stitching, carrying out graying on the spliced image; grayscale transformation and image filtering preprocessing are carried out. The method is scientific. The bridge crack automatic splicing device is simple in structure, easy to operate, good in detectioneffect and capable of rapidly and accurately achieving automatic splicing of the same crack at different visual angles, the problem that long cracks cannot be contained in crack images is solved, themaximum crack width and the automatic detection level of the real position of the maximum crack width in bridge quality detection are further improved, and smoothness and safety of traffic transportation are effectively guaranteed.

The invention relates to an image processing method, device and terminal, and the method comprises the steps: carrying out the scale change of a first image and a second image, and obtaining space representation sequences at the two scales, wherein the first and second images have overlapping parts; respectively extracting feature points based on pixels in the two space representation sequences, and obtaining feature points of all scales corresponding to the first and second images; carrying out the clustering of the feature points of all scales into different clusters based on the similarity of feature points of the same scale; respectively determining matching points based on the feature points in the clusters in the first and second images; and carrying out jointing and fusion of the two images based on the matching points. According to the embodiment of the invention, the method achieves the effective detection of cracks and grooves on a highway pavement, is high in accuracy, is good in instantaneity, and facilitates the formulation of a repair strategy for a broken pavement.

The invention discloses an ultrasonic detection imaging method. The method includes the following steps that first, a stepping motor drives a foldable multi-stage rotating ultrasonic probe, an ultrasonic probe body of the foldable multi-stage rotating ultrasonic probe transmits an ultrasonic signal, and an ultrasonic echo detection signal is collected and transmitted to a detection host; second, a signal processing module positions and calculates the position of the ultrasonic probe body, and position information is transmitted to the detection host; third, the ultrasonic echo detection signal picked by the detection host is imaged through the detection host, image splicing is performed according to the position information, and an image of a detected target is obtained; fourth, an image display displays the image. The invention further discloses a device for implementing the ultrasonic detection imaging method. The device comprises a sucker, the image display, the detection host, a power module, a signal processing module and the foldable multi-stage rotating ultrasonic probe. The device has the advantages of being simple in structure, easy to operate, convenient to control, high in accuracy and the like.

The invention discloses an image splicing method, and the method comprises the steps: obtaining and storing sequence images to be spliced, and enabling every two adjacent frames of the sequence imagesto be spliced to have an overlapped region; Extracting feature points from each frame of image to be spliced, screening the extracted feature points through image gray correlation to obtain matchingpoint pairs, and calculating a basic transformation matrix between the two frames of images according to the registration point pairs of the two adjacent frames of images; And unifying every two adjacent frames of images in the to-be-spliced image to the same coordinate system according to the corresponding basic transformation matrix to complete image matching, splicing the two frames of images according to a preset algorithm, and carrying out image enhancement processing on the spliced part by using a detail enhancement algorithm at the same time. Therefore, an accurate basic transformationmatrix can be calculated through the screening method for the feature points through gray correlation, the image splicing quality is improved, and finally, the overall image quality is further improved through a rapid and efficient image detail enhancement processing method.

The invention relates to a method and system for binocular fish-eye image splicing and unfolding correction. The method for binocular fish-eye image splicing and unfolding correction includes the steps: utilizing a binocular fish-eye camera to obtain an original binocular fish-eye image, and extracting the left and right two effective circular imaging areas from the original binocular fish-eye image; extracting the characteristic points of the overlapped part in the two effective areas, and matching the characteristic points in pairs; respectively mapping the two effective area images to obtain two space coordinate unit spherical surface images, performing matrix singular value decomposition on the three dimensional space spherical surface, obtaining the rotation relation, that is, the rotation matrix, between the two images through calculation, and correcting one of the space coordinate unit spherical surface images through the rotation matrix; and finally respectively mapping the twospace coordinate unit spherical surface images to obtain two panoramic coordinate images, and splicing the two panoramic coordinate images into a complete 360 DEG panoramic image. The method and system for binocular fish-eye image splicing and unfolding correction can solve the problem that the fish-eye imaging sensors are not in parallel during the assembling process, thus causing errors, and have the advantages of being good in the splicing effect after correction, being high in processing timeliness, and being easy to implement.

The invention relates to the coordinate error adjustment device and method in the jointing of surface default testing image. It joints the image of hundreds of caliber image using digital image treatment. It proposes the way of determination of the maximum angular tolerance alpha max, based on the tested caliber component dimension, viewing filed size and caliber number NXN aiming at the whole caliber jointing error, CCD coordinate and scanning track coordinate included angle alpha .It designs the angular adjustment structure to realize the consistence adjustment of the CCD coordinate system and the scanned track coordinate system. It uses the standard mark line standard plate, XY scanning system and special image processing software combination to realize the specific adjustment method with the included angle of two coordinates less than alpha max, ensures the right joint caliber to achieve the default degree and position accuracy.

The invention provides a current sensor and a measuring apparatus. The current sensor includes a magnetic induction unit and a processing unit provided on the outside of the wire to be measured, the magnetic induction unit is used for sensing a magnetic field generated by a current flowing through the wire to be measured and obtaining an induced signal corresponding to magnetic field intensity; the input end of the processing unit is electrically connected with the output end of the magnetic induction unit to process the induced signal, and at least one pair of magnetic induction units are arranged on the outside of the wire to be measured, the processing unit obtains the value of the current flowing through the measured wire through differential operation based on the paired induced signals. The current sensor is high in measurement accuracy, high in anti-interference capability, and low in installation requirement.

The invention provides a three-dimensional geometrical measurement method and a three-dimensional geometrical measurement system based on LED tag tracking. A three-dimensional scanner is arranged such that the three-dimensional scanner can move along a track and is close to an object to be measured, and blocked local measurement is flexibly and conveniently carried out on a large-scale object by a structured light method to obtain a high-resolution local image. Meanwhile, as the light of an LED tag is bright enough, even when the distance between a stereoscopic tracker and the LED tag increases, the stereoscopic tracker can quickly and accurately track the LED tag to ensure that a server can precisely locate the center position of the LED tag and the position of the LED tag in the coordinate system of the three-dimensional scanner, precisely obtain the LED tag relationship between two local measurements, accurately evaluate the attitude change of the three-dimensional scanner and realize precise stitching of local measurement results. Moreover, three-dimensional measurement of the whole contour of a large-scale object can be completed conveniently, stably and accurately without the need for tedious switching between multiple projectors.

The invention provides a point cloud splicing method and system. The method comprises the following steps: inputting two groups of point clouds and a preset splicing precision; carrying out initial splicing on the input two groups of point clouds by utilizing match feature points to obtain two groups of initial feature point sets; removing abnormal points in the two groups of initial feature point sets according to the preset constraint conditions to obtain finally-determined two groups of feature point sets; calculating an objective function corresponding to the two groups of feature point sets determined above, and carrying out least square iteration on the two groups of feature point sets determined above to obtain a group of transformed point clouds; and when the precision of the objective function is smaller than the preset splicing precision, carrying out precise splicing on the transformed point clouds and the other group of point clouds in the feature point sets. The point cloud splicing method and system can realize quick and precise point cloud splicing.

The invention discloses a house type drawing method based on room splicing, and relates to the field of virtual house type design. The house type drawing method based on room splicing solves the problems in the prior art that the measurement of the thickness of an inner wall is imprecise and house type drawing is inaccurate. The method comprises the steps of firstly drawing a frame of an inner wall line of the first room with the inner wall line being reference in a plane mode and determining the quantity and positions of inner doors; then setting boundary data of rectangular door frames of the inner doors and drawing the rectangular door frames of the inner doors according to the set boundary data; continuing to draw other rooms to keep mutually independent dissociative and separated states of all the rooms; finally splicing and combining the rooms which share the same inner door through the rectangular door frame of the shared inner door and filling the space area between frame sides of two opposite inner wall lines of adjacent rooms. By measuring the length of the wall inner line of a single room and the distance of the door side and a wall corner point and according to the relationship of the door spacing after the rear doors of the rooms are merged, the thickness of the wall can be accurately calculated, and the thickness of the inner wall is accurately drawn.

The embodiment of the invention discloses a 3D image generating method and device. The method includes the steps that images of a target object in at least two shooting angles are acquired; the contour line of the target object in each image is recognized; one image is selected from the images of the target object in the at least two shooting angles, and according to the contour line of the target object in one image, the object type of the target object is determined; for each image, according to the contour line of the target object in the image and the object type, a foreground image and a background image of the target object are acquired from the image; the foreground image is an image corresponding to the target object, and the background image is an image corresponding to the background part of the target object; according to the foreground image and the background image of the target object, and a 3D image is obtained in a spliced mode. With the method and device, the 3D image of the target object can be generated according to the photographed image of the target object, and therefore the 3D image of the target object can be photographed.

The invention relates to the field of digital image processing and provides a random sample consensus (RANSAC) algorithm for removing mismatching pairs from image splicing after characteristic point matrices of images are compressed. The algorithm can increase operational speed greatly, is suitable for parallel computation, can greatly improve the matching efficiency, and provides an optional image splicing and fusion solution for diverse multimedia equipments at present. Therefore, the invention adopts a technical scheme that an image matching method utilizing block Boolean operation comprises the following steps of dividing the matrices, compressing the matrices and conducting Boolean conversion, matching characteristic matrix blocks in Boolean formats of the two images, searching the best characteristic matching pair, conducting matching operation of the RANSAC algorithm, and finally confirming the best affine matrix. The image matching method is mainly applied to digital image processing.

The invention discloses a multimedia file splicing method and apparatus. The method comprises: a first video clip and a second video clip that are going to be spliced are obtained; audio files corresponding to the first video clip and the second video clip are obtained, wherein the audio files record first starting and ending time of the first video clip and second starting and ending time of the second video clip; the first video clip is adjusted to be played within a first period of time indicated by the first starting and ending time and the second video clip is adjusted to be played with a second period of time indicated by the second starting and ending time, wherein the first period of time and the second period of time do not overlap with each other; and splicing operation is carried out on the adjusted first video clip and the adjusted second video clip to obtain a spliced video file. According to the invention, a technical problem of low synthesis precision during the audio and video splicing process in the prior art can be solved.

The invention relates to an image fusion method for a dome screen system. The image fusion method for a dome screen system is characterized by determining the projection area of each projector by means of a mesh model of the dome screen body so as to enable each projector to have adjustability for the projection position; performing edge fusion on each projection area by means of polar coordinatesgeometrical correction processing, so as to enable the projection area image at different position and in different size to achieve the effect of accurate splicing; and respectively performing colorcalibration of the projectors and fusion band blanking operation of projection images by means of unified color processing and light leakage compensation processing, thus effectively avoiding color variation and luminance variation between each edge fusion image. By means of the steps provided by the image fusion method for a dome screen system, the stereo projection image on the dome screen bodycan achieve the display effect of complete frames, unified color and suitable luminance, and comfortable and perfect film watching experience can be brought to spectators. The image fusion device employing the image fusion method for a dome screen system can generate a standard fusion image with better display effect, and the dome screen system employing the image fusion method can have excellentprojection effect and can improve the film watching experience of spectators.

The invention discloses an image stitching method, device and equipment, and a computer medium. The method comprises the following steps that: collecting a first collection image and a second collection image; according to the first collection image and the second collection image, determining the projection datum points of the collection images; on the basis of the projection datum points of thecollection images, independently projecting the first collection image to a stitching surface to obtain a first image to be stitched, and projecting a second collection image to the stitching surfaceto obtain a second image to be stitched; and on the stitching surface, stitching the first image to be stitched and the second image to be stitched. According to the image stitching method, device andequipment, and the computer medium provided by the embodiment of the invention, the collection images can be accurately stitched on a specific stitching surface.

The embodiment of the invention discloses a method and device for generating a pose estimation model. The method comprises the steps of obtaining a training sample set; for each training sample in thetraining sample set, determining whether the training sample meets a preset condition or not, if yes, generating annotation information representing that the point cloud data corresponding to the training sample can be spliced, and if not, generating annotation information representing that the point cloud data corresponding to the training sample cannot be spliced; and taking the two panoramas included in the training sample in the training sample set as the input of the initial model, taking the preset camera pose parameters and the annotation information corresponding to the two input panoramas as the expected output of the initial model, and training to obtain a pose estimation model. According to the embodiment of the invention, the trained pose estimation model can accurately estimate the relative poses of the cameras of the two shooting points, and accurately determine whether the two sets of point clouds can be spliced or not, thereby facilitating the improvement of the accuracy of point cloud splicing.

The invention provides a coordinate conversion method between high-precision local maps, a terminal and a storage medium. Obtaining a first local map, a second local map and connection nodes between the two local maps, selecting a conversion matrix dimension according to the local map dimension, comparing the key points in the first local map with the corresponding key points in the second local map, and obtaining a vector relation of the corresponding key points in each dimension of the coordinate system; dividing the scene map into a plurality of local maps; precise local map splicing is achieved through the coordinate conversion relation, a local map of a loading area is pre-judged according to the vehicle driving intention, semantic information of the road topography and the landform is obtained through the continuous local map coordinate conversion relation, and orderly management and classification of indoor multi-layer, cross-layer, underground and underground multi-layer high-precision map data are achieved.

The invention discloses a wide-viewing-angle quick splicing method for high-resolution images, which aims to improve the image matching speed and precision, and comprises the following steps of: performing down-sampling processing on a plurality of original images to be spliced; determining an overlapping region between the down-sampled images; detecting feature points in the overlapping region byadopting an SURF algorithm; for the detected feature points, adopting a BRIEF algorithm to generate feature point descriptors; for the feature point descriptors, adopting a Brute-Froce Matcher algorithm to carry out feature point pair coarse matching; calculating a Hamming distance between the two feature point descriptors, and removing wrong matching; carrying out fine matching by using an RANSAC algorithm, solving a homography matrix, and obtaining a relative position relationship between the images; and performing image fusion processing on the overlapping regions of the original images based on a gradual-in gradual-out weighted average algorithm so as to fuse and splice the overlapping regions into a wide-viewing-angle image.

The invention relates to a guide vehicle for piling construction of river embankment engineering. The guide vehicle for piling construction of river embankment engineering is characterized in that the guide vehicle comprises a front vehicle frame and a rear vehicle frame, and the front vehicle frame and the rear vehicle frame are detachably locked to pile bodies inserted in soil; the front vehicle frame and the rear vehicle frame are connected through a driving structure, and the driving structure is used for driving the front vehicle frame and the rear vehicle frame to slide relative to the arrangement direction of the pile bodies; and a guide frame provided with a guide space allowing the lower sections of the pile bodies to be inserted therein is arranged on the front portion of the front vehicle frame, and the guide space of the guide frame can extent out to the position in front of the pile body at the headmost end so as to allow the lower sections of the pile bodies to be inserted therein. The guide vehicle for piling construction of river embankment engineering is reasonable in structural design, and positioning of the pile bodies is accurate; and the guide vehicle can move forwards step by step, so that the pile bodies to be inserted in soil are guided conveniently.