165 results about "Large format" patented technology

An optical attachment having five or six elements and configured to be operably arranged on the image side of an objective lens to reduce the focal length and focal ratio of the objective lens is disclosed. The optical attachment is particularly suitable for adapting objective lenses designed with a relatively large working distance for a large format size to cameras having a smaller format size and relatively small permissible working distance. The optical attachments disclosed herein have high image quality at large aperture over a large field of view, and can be well-corrected for all major aberrations.

The invention discloses a multi-laser-head intelligent laser cleaning method. The method comprises the steps of S1, acquiring a three-dimensional shape of a to-be-cleaned workpiece, and determining abe-cleaned area; S2, determining a motion track and a scanning mode of each laser head according to the three-dimensional shape of the to-be-cleaned workpiece and be-cleaned area; S3, selecting technological parameters of all laser heads, and moving all the laser heads along the motion track and emitting laser to clean the surface of the workpiece; and S4, acquiring an image of the cleaned workpiece surface in real time, detecting the workpiece surface cleaning condition by using an image processing algorithm, and if the preset requirement is not met, returning to the step S3 until the detection result meets the preset requirement. The multiple laser heads can be matched with one another to clean dirt on the surface of the workpiece, and the laser cleaning method is particularly suitable for cleaning surfaces with large breadth and complex shape and structure, and has the advantages of being high in cleaning efficiency, good in cleaning quality and the like.

The invention discloses a large-format remote sensing image ship target detection method and system under a small sample condition. The method comprises the steps: introducing an SENet attention mechanism module into a Bottleneck module of a YOLO v5 network, adding a detection layer, and forming a target detection network; constructing a pre-training data set to perform pre-training on the targetdetection network, and performing transfer learning on the target detection network by using the preprocessed ship target annotation data set to obtain a test model; and carrying out iterative cuttingon the large-format remote sensing image to be recognized to obtain a small image, respectively carrying out target detection and target coordinate conversion by using the test model, and outputtinga target detection result. According to the method, effective training of a network model and large-format image quick detection can be completed by using small-batch image target samples, and the accuracy and robustness of ship target detection are maintained.

The invention provides a large-format rapid 3D printing method and device based on DLP photo-curing. The large-format rapid 3D printing method based on DLP photo-curing comprises the steps that four groups of DLP projection system components are adopted to constitute a large-sized format projection system ( the large-format projection system for short), the large-format projection system is controlled by a computer to continuously play UV images of 365-405 nm layer by layer, the UV images enable photosensitive resin to be cured layer by layer, a Z-axis printing platform descends layer by layer, and then a three-dimensional object is formed through such reciprocating iteration. The large-format projection system is placed on the upper portion of the whole device system, a seal component cavity is arranged on the lower portion, the upper portion of the seal component cavity restrains generation of bubbles through high-pressure oxygen and forms a curing dead zone, under the action of the dead zone and the high-pressure oxygen, the liquid level can be kept stable; and meanwhile, under the action of a balance box and a liquid level laser ranger, on the premise of not lowering the precision, the large-format rapid 3D printing device greatly improves the printing speed and the printing format.

The invention relates to a metasurface color holography preparation method, which comprises the following steps of on the basis of a pixel structure or pixel distribution, respectively layering and extracting a color target object image to obtain the corresponding multiple image layers; respectively obtaining a micro-nano structure and a micro-nano structure combination corresponding to each imagelayer, and obtaining a change relationship between the micro-nano structures and the micro-nano structure combinations among the layers; according to the combination of the micro-nano structure and aprimary color micro-nano structure of any image layer, realizing the simultaneous preparation of intra-layer multiple pixel micro-nano structures of the image layer by utilizing photoetching of spaceor/and phase modulation; and according to the change relationship of the micro-nano structures and the micro-nano structure combinations among the layers, realizing the simultaneous preparation of the micro-nano structures and the micro-nano structure combinations of the rest layers in a time-sharing manner by utilizing space or/and phase real-time regulation and control. According to the invention, the simultaneous preparation of multiple pixel micro-nano structures and the time-sharing preparation of the layered pixel combinations are realized, so that the large-format rapid preparation ofcolor holography can be realized.

The invention belongs to the technical field of laser precision machining, and particularly provides a correction method of a large-format laser scanning system, which comprises the following steps: acquiring a theoretical coordinate system of an imaging coordinate format of the laser scanning system, and setting array marks on the imaging coordinate format to uniformly and equally divide the imaging format; arranging a flat plate on a laser focusing plane of the laser scanning system, adjusting laser parameters according to coordinates of the array marks in the theoretical coordinate system to emit laser, and making the marking points of the array marks on the flat plate in a one-to-one correspondence mode; scanning the flat plate to obtain an electronic image with the marking points; andacquiring an actual coordinate system of each marking point in the electronic image, comparing the actual coordinate system with a theoretical coordinate, and outputting a correction compensation value of each marking point in the theoretical coordinate system. According to the scheme, the cost is low, the influence of a mechanical structure on the correction precision is avoided, new factors influencing the correction precision are not introduced, and correction can be carried out anytime and anywhere.

Narrow-line holographic filters that can include a plurality of lines and that can be structured to provide a large aperture device. Materials that can be used to construct filters include glasses, photorefractive crystals such as lithium niobate and photorefractive thick polymers. The filters are fabricated by assembling a plurality of elements having the same one or more narrow line holographic filter patterns written thereon, in mutual orientation such that each element has a surface defined by a length and a width adjacent a corresponding surface of a neighboring element, and has a surface defined by a thickness and one of a length and a width accessible to impinging illumination. Filters exhibiting a plurality of characteristic narrow lines, and having arbitrarily large apertures can be fabricated. Methods of fabricating and using the filters are described.

The invention relates to a resin coating 3D printing method and system. The resin coating 3D printing method comprises the steps that a 3D digital model of a sample to be printed is generated, and the3D digital model is cut into an image sequence; an image is controlled to be sent to an exposure system, wherein the exposure system projects the image to the surface of a transparent film through aprojection lens; the exposure system drives light to irradiate the projected image, and a curing layer is generated through exposure; after one layer is printed, the sample descends to be separated from the transparent film, the return distance of a sample table is the printing thickness of a next layer, a film rolling device is controlled to roll or rotate on the surface of the transparent film,a printing material is moved away, the transparent film is flattened, a laser displacement device is controlled to detect the state or position of the transparent film, and if the transparent film isflattened, the film rolling device is controlled to move out of a projection area; and a gap between the sample and the transparent film is filled with resin required for printing the next layer, andexposure printing is repeated in sequence until printing is finished. According to the resin coating 3D printing method and system, the film rolling device is arranged, the transparent film is flattened through the film rolling device, and high-speed and large-format machining can be conducted.

The invention discloses a three-beam interference lithography method and a system. The method comprises that: a laser beam is divided into three beams by phase grating and then N times of interference exposure are realized on surface of a workpiece; a dislocation value of two adjacent exposure positions is dI/N, wherein N is an odd number greater than or equal to 3, and dI is a light intensity distribution cycle after the exposure; and the three beams are respectively a first beam, a second beam and a 0 beam with the same complex amplitude. With the three-beam interference lithography method of the invention, a large-size precision multi-level structure can be directly prepared in photoresist with high processing energy efficiency and the components used are easily obtained and have low cost. In addition, by adopting the three-beam interference exposure, the grating and the system have no zero elimination requirement and are easy to prepare.

The invention discloses an optical remote sensing image ship detection method based on block extraction of interest, and mainly solves the problems of low detection precision and more false alarms inthe prior art. The method comprises the following steps: constructing an optical remote sensing image ship detection data set; carrying out downsampling and defogging enhancement on the wide remote sensing image, and carrying out land and water segmentation by using context information and image global features; training an SCRDet-based target detection model by using the constructed data set; according to the land and water segmentation result, scanning the original wide remote sensing image by using a partially overlapped sliding window to extract an interested block as a to-be-detected area, and inputting the to-be-detected area image into the detection model to obtain an area detection result; mapping a region result to an original wide image scale, and performing improved non-maximumsuppression to optimize a preliminary detection result; and optimizing the detection result again according to the structural characteristics of the ship. The method is high in detection precision and low in false alarm rate, and can be used for acquiring ship targets of interest and positions thereof in large-format remote sensing images.

The invention discloses a large-width free surface multi-projection automatic splicing method. By using the large-width free surface multi-projection automatic splicing method, automatic projection splicing fusion can be carried out on an uneven large-width free surface. In the invention, according to positions of an effective projection region and a region to be subjected to projection, a corresponding relation between a camera image space and a display image space is established; a corresponding relation between each projector image space and the camera image space is established by using an encoding structure optical scanning method; and thus, a corresponding relation between each projector image space and the display image space is obtained, so that points in the display image space can be mapped to corresponding positions in the corresponding projector image spaces. The large-width free surface multi-projection automatic splicing method can be widely applied to the fields of big show, large-scale activities, city image advertising and the like, overcomes the defects of high personnel requirement, long regulation time and the like of a conventional manual free surface splicing system, can replace the pure manual free surface splicing system abroad and greatly reduces manufacturing cost of a culture performance product.

The invention discloses a large-format laser polishing system for a metal additive component and a machining method, which are capable of achieving large-area precision polishing of a to-be-machined workpiece. The polishing system mainly comprises a laser, an XY digital scanning galvanometer, an XY servo motion platform, an embedded servo control system, a high-bandwidth driver, a computer and anoptical lifting platform. The machining process comprises the steps that a scanning track and a scanning speed are determined according to the size and polishing parameters of a to-be-machined metal additive component; movement tracks of two systems of the XY digital scanning galvanometer and the XY servo motion platform are determined; and the XY digital scanning galvanometer and the XY servo motion platform are controlled by the embedded servo control system to realize closed-loop control, and a master-slave control architecture is adopted. According to the system and the method, automatic distribution of reference tracks of the galvanometer and the motion platform of the large-format laser polishing system is achieved, a master-slave control strategy is introduced on the basis of the two closed-loop subsystems of the galvanometer and the motion platform, and the polishing quality and the polishing efficiency of large-format laser polishing are improved.

The invention relates to a positioning marking method applicable to a large format. The positioning marking method comprises the following steps: 101, by calibrating a camera and actually measuring the camera format, the corresponding relationship between the camera and an axis coordinate system is established; 102, a product is divided into a plurality of areas according to the actual format of the camera, a coordinate set of needed photographing points is calculated, the camera is moved to series coordinates to photograph, and a system splices received independent images of the multiple areas to obtain an integrated image; and 103, the integrated image is loaded on a processing panel to serve as a substrate, a processing drawing file is moved onto a marking position of the substrate, andthe to-be-processed product is marked according to the integrated image. The defects that in the prior art, due to the large workpiece format, the lens scanning area is limited, consequently high-precision and large-format marking cannot be achieved, and the application range of laser processing is limited are overcome, the positioning marking method is applicable to positioning marking of the large format, high-precision marking is achieved, and meanwhile assembly-line-type automation continuous and precise marking can be achieved.

The invention discloses a method for quickly processing a large-format video image through partial format data, a CPU is used for screening full-format image data to obtain partial-format image data;the CPU is used for uploading the partial format image data to a GPU; the GPU is used for reconstructing the partial format data into the full-format image data; and the GPU outputs the reconstructedfull-format image data. By the adoption of the method, rapid previewing can be realized, and the flexibility is high.

The invention discloses an additive substrate plane distortion compensating method. A distance measuring head is used, and plane distortion data on the surface of an additive substrate are scanned andmeasured; parameters such as a plane distortion compensation value are calculated by a three-dimensional printing controller, and a forming action head is controlled to follow additive substrate surface distortion and implement deposition operation; in the process of printing a plane distortion compensation base, by real-time adjustment of the deposition compensation amount of the forming actionhead, plane distortion of the additive substrate is cumulatively compensated layer by layer; and finally an upper surface close to an ideal plane is obtained on the finally-completed plane distortioncompensation base, and upper surface is used as a reference plane for a three-dimensional printed part. By means of the method, high flatness of the additive substrate does not need to be ensured, complicated and precise multi-point leveling mechanisms are not needed, large-format deposition additive operation can be realized, and the material and processing cost of the additive substrate can be reduced.

The invention provides a regional scanning large-format galvanometer correction system based on an A3 format scanner, and the system comprises the steps: marking a circular array file according to the size of a to-be-corrected format, designing 17 rows and 17 columns of marked circular array files, and marking mark points on a first correction target A and a first correction target B through a to-be-corrected galvanometer; the maximum width is scanned through a two-dimensional scanner, the correction target A and the correction target B are the same galvanometer laser processing equipment, and actual coordinates of all points of the target A and the target B are obtained through an image recognition algorithm; finally, a correction file of the galvanometer is generated through the actual coordinates of 17 * 17 to complete correction, rapid multi-point correction of the galvanometer laser processing equipment with the breadth of 300 mm or above is achieved, manual measurement of coordinates of multiple points as before is not needed, errors and time waste caused by manual measurement are avoided, and the accuracy of the measurement is improved. And data in the whole process can be backed up and recorded through the server.

The invention discloses a large-format optical polarization pattern generation device which comprises an illumination component, a polarization pattern generation component, a miniature imaging component and an imaging detection and splicing component which are connected in sequence. The illumination component is used for realizing single polarization collimation of uniform surface light spots; the polarization pattern generation part comprises a quarter-wave plate and a phase modulator and is used for outputting a polarization pattern; the miniature imaging component is used for miniaturizingthe polarization pattern output by the polarization pattern generation part and writing the miniaturized polarization pattern into the photosensitive material; the imaging detection and splicing component comprises an imaging detection sub-part and a focal length calibration sub-part; and the imaging detection sub-part comprises a double-light-path pattern monitoring imaging assembly and a pattern splicing assembly. The integrated optical system, the motion control system and the detection system have the advantages that the single-exposure polarization pattern is high in precision, optionally controllable and high in efficiency, large-area optical polarization patterns can be realized, and the like.

The embodiment of the invention discloses an ultra-large-breadth high-resolution scanning method and a related platform type scanner. The scanning method can be applied to the scanner, and the scannercomprises a scanning area. The scanning method can comprise the following steps: acquiring a scanned manuscript, wherein the length of the scanned manuscript is greater than that of the scanning area; moving the scanned manuscript along the first movement direction to pass through the scanning area, wherein the adjacent scanned manuscripts passing through the scanning area partially have an overlapping area; scanning the part of the scanned manuscript passing through the scanning area along a second motion direction to obtain a plurality of scanning images, wherein each of the plurality of scanned images includes an image of an overlapping region; and acquiring a plurality of scanning images, and splicing the plurality of scanning images by utilizing the images of the overlapping regionsto obtain a complete image of the scanned manuscript. Through the embodiment of the invention, the technical problems of how to realize no limitation on the scanning length and how to reduce the manufacturing cost and the manufacturing difficulty under the condition of not reducing the scanning resolution are at least partially solved.

The invention discloses a form-following adjusting base plate of a large-size thin-wall structure part for selective laser melting forming. The base plate is divided into multiple sections of movablebase plates, the diameters of the base plates are gradually increased from top to bottom, the base plate on the upper section can be embedded on the next adjacent section of base plate in a sleeving manner, the thickness of each section of base plate is consistent, and the base plates can be placed in the large-format thin-wall structure part.