8804 results about "Focal length" patented technology

The invention relates to the technical field of optical detection, in particular to a workpiece surface defect detection method and system based on the optical technology, and the method comprises the following steps: S1, generating a curvature model of a workpiece; s2, dynamically adjusting the irradiation angle and the light spot shape of a light source according to the curvature model in the S1; s3, adjusting the focal length of the detection equipment in real time; s4, imaging acquisition is carried out on the workpiece at the same time through multiple angles; s5, correcting image distortion caused by surface curvature change, and fusing the multi-angle images into a high-precision workpiece surface image; s6, defect features of the surface of the workpiece are extracted, defects are classified, positions are marked, and a defect detection report is generated; according to the invention, by dynamically adjusting the light source and the focal length and combining multi-view imaging and advanced image processing technologies, efficient and accurate defect detection is realized, and the product quality and the production efficiency are remarkably improved.

The invention belongs to the technical field of fire safety, and discloses a fire-fighting equipment detection early warning method and system based on a visual camera, and the method comprises the following steps: obtaining multi-focal-length image frames of a fixed spray head and a fire extinguisher edge region, judging the continuous change of gray scale in the continuous image frames, and carrying out the detection early warning of the fire-fighting equipment based on the visual camera. Comparing the gray level distribution difference under the long focus and the short focus, identifying the dynamic trajectory of the contour line angular point of the fire-fighting equipment association structure, analyzing the delay of the function action response, marking as an abnormal region, and generating a fire-fighting equipment collaborative early warning information set; according to the invention, by extracting and analyzing the multi-focal-length image frames of the edge areas of important facilities such as a fixed spray head and a fire extinguisher, fine changes of the fire-fighting facilities under differentiated focal lengths can be captured, working states and potential faults of the fire-fighting facilities can be judged, functional abnormalities caused by equipment aging or damage can be recognized in advance, early warning can be carried out in real time, and the safety of the fire-fighting facilities can be improved. And a higher guarantee level is brought to fire safety.

A metalens for focusing light is described. The metalens includes a library of elements for varying the propagating phase of the focusing light over at least a 2π radians range, where the library of elements is arranged in a sub-wavelength pattern that defines spacings between the elements. Each spacing exhibiting temperature-dependent spacing changes within a temperature range and each element in the library of elements includes: a refractive index exhibiting a temperature-dependency within the temperature range, a shape exhibiting a temperature-dependency within the temperature range, and a size exhibiting a temperature-dependency within the temperature range. The metalens also includes a phase profile defined by a combination of the refractive index, shape, and size of each element in the library, and the sub-wavelength pattern of the library of elements. The metalens also includes a focal length defined by the phase profile, the focal length exhibiting a temperature-dependency within the temperature range.

The invention provides a burn area measurement method and system, electronic equipment and a storage medium, and relates to the field of area measurement. The method comprises the following steps: photographing a target part to obtain a multi-modal burn image set, and carrying out image registration; and constructing a global three-dimensional surface model based on the registered image set. Carrying out burn area identification segmentation on the multi-mode burn image, mapping a segmentation result to the global three-dimensional surface model, and obtaining a preliminary burn area three-dimensional surface model; and performing multi-scale feature extraction and fusion on the registered image set, and inputting a depth estimation model to obtain burn depth estimation data. And performing deep layering on the preliminary burn area three-dimensional surface model based on the burn depth estimation data to obtain burn area three-dimensional images of different depth levels. And calculating the actual burn area of each depth level based on the burn area three-dimensional images of different depth levels and the camera focal length information. Through the method, the accuracy of burn area measurement is improved.

An optical lens having, in total, six lenses which sequentially comprise from an object side to an imaging surface (S15) along an optical axis: a first lens (L1) having a negative focal power, an object-side surface (S1) thereof being a convex surface, and an image-side surface (S2) thereof being a concave surface; a second lens (L2) having a positive focal power, an object-side surface (S3) and an image-side surface (S4) thereof both being convex surfaces; a third lens (L3) having a positive focal power, an object-side surface (S5) thereof being a convex surface, and an image-side surface (S6) thereof being a concave surface; and a fourth lens (L4) having a negative focal power, an object-side surface (S7) and an image-side surface (S8) thereof both being concave surfaces; a fifth lens (L5) having a positive focal power, an object-side surface (S9) and an image-side surface (S10) thereof both being convex surfaces; and a sixth lens (L6) having a negative focal power, an object-side surface (S11) thereof being a convex surface, and an image-side surface (S12) being a concave surface. An effective focal length f of the optical lens and the radius of curvature R6 of the image-side surface of the third lens (L3) satisfy: R6 / f>14.0. By means of the reasonable configuration of surface type of each lens and the reasonable focal-power combination in the optical lens, the resolution of the optical lens is improved, and the aberration is reduced, thus improving the imaging quality of the optical lens.

The invention discloses an intelligent steel pipe surface defect recognition system based on deep learning, and particularly relates to the technical field of pipe surface defect analysis. An annular polarization light source array and a high-frame-rate CMOS sensor are adopted to synchronously collect visible light and near-infrared multi-polarization images; a surface normal is calculated based on Stokes parameters, mirror surface suppression and diffuse reflection enhancement are realized, a defect candidate area is generated by fusing multi-scale Laplacian pyramid residual error and Renyi entropy segmentation threshold positioning, multi-physical quantity registration is completed through white light interference and infrared thermal imaging, a six-channel feature cube is constructed, and a three-dimensional image is obtained. According to the method, space, spectrum and thermal characteristics are jointly extracted in the multi-head attention convolutional neural network, the confidence coefficient is evaluated in combination with Jensen-Shannon divergence, and the polarization angle and the focal length are dynamically adjusted according to the confidence coefficient, so that closed-loop parameter self-optimization is realized, and the micro-scale pitting corrosion and millimeter-scale crack detection precision is remarkably improved.

The invention relates to the technical field of image recognition, in particular to an intelligent electric energy meter image collection method and system based on multi-source data, and the method comprises the following steps: collecting a multi-angle reflection contour image of an electric energy meter through a preset incident angle light source, and calculating a difference value point by point based on a standard reference contour point coordinate; and after edge sections are divided, the maximum value, the minimum value and the mean value are processed by adopting a Gaussian filtering algorithm, and a multi-angle difference statistical result is generated. According to the invention, through multi-angle reflection contour image acquisition, difference calculation and edge division, Gaussian filtering noise reduction, ultralimit edge segment extraction, angle focal length compensation through step length adjustment, edge extraction through a Canny edge detection algorithm and contrast change rate calculation, dynamic path instruction generation, high-frequency feature point density extraction through SIFT, and direction angle adjustment scanning sequence analysis, the method can be used for realizing multi-angle detection of the image. Calculating a standard deviation and a gradient variance to generate an abnormal graph, performing local focusing to compensate an abnormal region, performing gray scale consistency splicing replacement, and performing multi-source response optimization closed-loop correction.

The invention discloses a continuous zooming laser interference end point detection system, which is used for semiconductor etching and thin film process end point detection, and comprises an illumination module, a laser interference module and an imaging module, the laser interference module comprises a laser, a beam splitter, a beam splitting cube, a lens and a detector, a laser beam emitted by the laser passes through the beam splitter, the beam splitting cube and the lens and then is focused to a to-be-detected area on the surface of a wafer, and the surface of the wafer reflects the laser to the detector for detection; the focal length of the lens is continuously adjustable; the illumination module comprises a light source which is arranged on one side of the lens, and an illumination light beam emitted by the light source is used for illuminating a to-be-detected area on the surface of the wafer; and the imaging module comprises a camera which is arranged on one side of the lens and is used for recording and outputting image information of a to-be-detected area on the surface of the wafer. According to the invention, through continuous zooming and large numerical aperture of the lens, high-definition imaging and etching of a long working distance and accurate detection of a thin film process end point are realized.

The invention provides an optical lens. The optical lens sequentially comprises a first group with negative focal power and a second group with positive focal power from an object side to an imaging surface along an optical axis, the first group is a fixed lens group and comprises a first lens with negative focal power; the second group is a focusing lens group and sequentially comprises a second lens with positive focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with negative focal power and a sixth lens with positive focal power from the object side to the imaging surface; the air space between the first group and the second group and the air space between the second group and the imaging surface on the optical axis are variable; the focal length fa of the first group and the focal length fb of the second group meet the following conditions:-20lt; fa / fblt; -3. According to the optical lens provided by the invention, optical continuous zooming of the lens from a wide-angle state to a micro-distance state can be realized, and an excellent effect of compatibility of wide-angle shooting and micro-distance shooting can be realized.

The invention discloses an optical camera lens which comprises two lens groups. The two lens groups include six lenses. The two lens groups are sequentially a first lens group and a second lens group from the object side to the image side. The six lenses are sequentially the first lens to the sixth lens from the object side to the image side. The focal length of the optical pick-up lens is adjusted by adjusting the focal length through the change of the distance between the lens groups. The optical pick-up lens has a long focus end and a short focus end in a focal length adjustment process. The second lens group moves relative to the first lens group during the focal length adjustment process. At least one inflection point on at least one lens surface in the optical pick-up lens falls in the optical effective area in the focal length adjusting process. The second lens element has negative refractive power. When specific conditions are met, the optical camera lens can meet the requirements of small size, adjustable focal length, high imaging quality and easy assembly at the same time. The invention further discloses an image capturing device with the optical camera lens and an electronic device with the image capturing device.

A pest control system is disclosed comprising an optical, computational, and monitoring subsystem, optionally mounted on a mobile platform. The optical system may include a neutralizing laser or multi-wavelength light source, discovery and detail cameras (optionally stereo), a beam-steering mechanism, tunable focus, and optional thermal or depth sensors. The processor, such as a GPU or FPGA, identifies insect or biological targets, adjusts laser focus by depth, and controls beam activation. A monitoring system verifies safety by detecting humans or other non-target entities using environmental and thermal cameras; if detected, laser firing is inhibited. The mobile platform may use wheels, propellers, tracks, or cables, with GPS and data links for remote control. A visible light pre-flash may induce a blink reflex before firing. In some embodiments, a scouting drone transmits target coordinates to the neutralization unit, enabling coordinated, efficient, and safe laser-based pest control.

The invention provides an optical lens. The optical lens comprises a lens barrel, and a lens group and a spacing element group which are assembled in the lens barrel, wherein the lens group sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an image side along an optical axis; the spacing element group at least comprises a third spacing element; the third spacing element is positioned between the third lens and the fourth lens and is in contact with the object side surface part of the fourth lens; the effective focal length f of the optical lens, the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens meet the condition of 0.40 lt; f3 / f + f4 / f < = 0.75; the combined focal length f34 of the third lens and the fourth lens, the inner diameter d0m of the end face, closest to the image side, of the lens barrel and the inner diameter d3m of the image side face of the third spacing element meet the following formula:-0.05 lt; (d0m-d3m) / f < 34lt >; and 0.05%. The problem that stray light is serious due to the fact that an optical lens in the prior art meets the long-focus requirement is solved.

The invention relates to the technical field of synchronous acquisition, in particular to a multi-camera synchronous data acquisition method and system, and the method comprises the following steps: based on a real-time video stream of a camera, analyzing a video frame, recognizing a moving object in a differentiated video stream, and carrying out the recognition of the moving object in the differentiated video stream; and synchronously recording the occurrence time and position change of the moving object in the differentiated camera to obtain view angle change data. According to the invention, the angle and focal length of the camera are synchronously adjusted to cope with the view angle change of different scenes, and the trigger time of the camera is uniformly configured and is synchronously started through the network, so that the time deviation is reduced, the analysis of the synchronous trigger data set and the timestamp adjustment are synchronously triggered, and the synchronization between the cameras is optimized; the consistency and synchronism of the video streams obtained from different angles are ensured, the data transmission parameters are dynamically adjusted according to the network condition, the efficiency and synchronization precision in the data transmission process are improved, and the influence of network delay and bandwidth change is effectively dealt with.

The invention provides an optical lens, which comprises nine lenses from an object side to an imaging surface along an optical axis: a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the sixth lens has negative focal power; the seventh lens has positive focal power; the eighth lens has negative focal power; and the ninth lens has positive focal power. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the lens has one or more advantages of short focus, miniaturization, large field angle, large aperture, large target surface, low distortion and low sensitivity.

The invention discloses a multi-scene adaptive visual acquisition system and method, and belongs to the technical field of image recognition, and the system comprises an environment sensing module which is used for collecting carrier vibration spectrum, multi-band illumination intensity and target depth information in real time; the dynamic zoom imaging module drives the focal length adjustment rate of the lens to be dynamically associated with the frequency of the high-frequency component output by the vibration sensor; and the cooperative control module executes vibration compensation, spectrum fusion and target positioning, dynamically calculates based on an illumination intensity ratio and color temperature, and dynamically configures a target positioning threshold according to a target pixel area. According to the invention, the dynamic correlation vibration frequency and the focal length adjustment rate are utilized, and mechanical anti-shake pre-focusing and electronic anti-shake optical flow methods are matched to realize accurate compensation of low-frequency continuous vibration and high-frequency impact vibration, so that the imaging stability is remarkably improved in a dynamic environment, and the phenomena of image blurring and edge blurring are effectively reduced.

The invention relates to the field of industrial cameras, and particularly provides a panoramic splicing type industrial camera device for a complex scene and a splicing method, and the panoramic splicing type industrial camera device comprises a multi-camera array, a synchronous control module, an image processing module, a calibration module and a communication module. The multi-camera array is distributed in an annular or matrix mode. The synchronous control module realizes sub-microsecond synchronization (error is less than 0.8 microsecond) based on an LVDS hardware trigger architecture, and eliminates splicing dislocation of a high-speed moving target. The image processing module carries an FPGA hardening assembly line and completes image distortion correction, optimization ORB feature matching and multi-band fusion in real time. The calibration module integrates a multi-mode sensing unit, and dynamically adjusts exposure, focal length and white balance through improved Kalman filtering and a deep reinforcement learning decision algorithm. In a strong interference environment, the panoramic stitching precision reaches 0.01 mm, the defect detection sensitivity is 30 [mu] m, the power consumption is only 12 W, and the system is suitable for various industrial scenes.

The invention discloses a self-adaptive focal length control method and system of a laser cutting machine, particularly relates to the technical field of laser processing, and is used for solving the problem of insufficient laser focus control precision caused by separation of a detection point and a processing point and geometric mutation of a curved surface in the prior art. Instantaneous distance information is continuously obtained in the moving process of a cutting head, the curvature change characteristics of the surface of a workpiece are calculated according to the instantaneous distance information, inertial load and dynamic load risks caused by geometrical morphology sudden change are comprehensively evaluated, and a path risk section and a non-path risk section are intelligently recognized. A conservative prediction mode and a conventional prediction mode are adaptively switched according to different risk sections, the normal vector of the surface of a workpiece at a laser machining point is accurately predicted, then the posture adjustment amount of the cutting head is calculated according to the normal vector, and finally real-time and smooth posture adjustment of the cutting head in the movement process is achieved through multi-axis synchronous interpolation control. And the laser beam is always vertical to the surface of the workpiece.

The invention relates to a multifunctional deformation measurement device and a measurement method, and belongs to the technical field of thermal deformation measurement. Manufacturing a multifunctional deformation measuring device; marking the test piece to be tested; calibrating the precision of the measurement system by using a reference standard substance; a temperature sensor is installed on the test platform; vacuumizing treatment is conducted through a vacuum system; temperature control is carried out through a temperature precise regulation and control module; forming a heat radiation boundary; adjusting the visual angle and focal length of the measuring camera; adjusting a monochromatic illumination light source to realize light coverage on the tested piece; spraying speckles on the test piece to be tested; measuring the initial state of the tested piece; temperature control is carried out through a temperature precise regulation and control module; testing and recording the deformation condition of the tested piece at each temperature point in the whole test process; the method can solve the problems that a measurement test piece is only limited to a material-grade sample, the measurement environment simulation application range is small, the measurement error is large and the like in a traditional method, and is used for guaranteeing high-precision measurement of thermal deformation of a large-size composite material structure of a spacecraft.

The invention discloses a method for analyzing mineral trace elements by utilizing a micro-Raman spectrum, which comprises the following steps of: fixing a mineral sample on a rotary sample table of a micro-Raman spectrometer, selecting an area to be detected by combining a micro-imaging technology, collecting a Raman background signal under the pre-illumination of low-power laser, and analyzing the trace elements in the area to be detected according to the Raman background signal. The laser focal length, the spot size and the incident angle are adjusted accordingly, the laser is focused on a target area, under the calibrated laser condition, through a multi-angle excitation micro-area, after an algorithm is applied to optimize signals, reduce impurity interference and integrate multi-angle Raman signals, the characteristic spectrum information of the microelements can be extracted, and the microelements can be accurately detected. High-resolution analysis of sample components is realized, and a three-dimensional distribution model of microelements in a microcell is constructed in combination with microscopic imaging data. The method has the characteristics of non-destructiveness, high resolution and rapid detection, and is suitable for mineral component analysis in the fields of geology, material science and the like.

The invention provides a control method of welding type coupling equipment, which comprises the following steps: comparing extracted contour and center line data according to a preset welding spot size and a preset fusion width threshold value, and judging whether the size of a welding spot is abnormal or the fusion width of the welding spot is abnormal or not; if the welding spot is abnormal, adopting an image segmentation method to identify an abnormal region in the image, and calculating the area and geometric features of the abnormal region through a pixel statistical method to obtain the size and deformation degree of the welding spot; the corrected welding instruction data are obtained, and energy, focal length and welding gun angle parameters in an instruction are extracted to serve as reference values of welding instruction analysis; by analyzing an energy distribution curve in the welding process and combining focal length data collected in real time and welding gun angle changes, whether welding energy and focal length are matched with reference values of welding instruction analysis or not is judged; if the welding energy and the focal length are not matched with the reference value analyzed by the welding instruction, the control parameters of the welding equipment are adjusted according to the deviation value, and the correction amount of the welding gun path is recalculated.

An electronic device has multiple cameras and displays a digital viewfinder user interface for previewing visual information provided by the cameras. The multiple cameras may have different properties such as focal lengths. When a single digital viewfinder is provided, the user interface allows zooming over a zoom range that includes the respective zoom ranges of both cameras. The zoom setting to determine which camera provides visual information to the viewfinder and which camera is used to capture visual information. The user interface also allows the simultaneous display of content provided by different cameras at the same time. When two digital viewfinders are provided, the user interface allows zooming, freezing, and panning of one digital viewfinder independently of the other. The device allows storing of a composite images and / or videos using both digital viewfinders and corresponding cameras.

A laser-based system and method for cleaning solar panels that have accumulate dirt or grime. The laser-based system employs methods for identifying optimum timing when the laser-based cleaning is to be performed. Otherwise, a selective cleaning will be performed on the solar panel. The method receives a combination of weather data, power output data, and solar image data to pin-point dust contours from the solar panel and removes the dust hotspots through pointed laser cleaning on accounting the tradeoff between the power consumed the by the laser and power gained from the cleaned solar panel. To achieve pin-pointed laser beam cleaning, the system adjusts the focal length of the laser beam. The method pin-points the removal of dust contours responsible for reduction in power output by analyzing weather, power output and time series images and optimally determines the region of interest to remove the dust hotspots through pointed laser cleaning.

The invention discloses an optical lens and electronic equipment. The optical lens sequentially comprises a first lens with focal power, a second lens with positive focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power and a seventh lens with positive focal power from a first side to a second side along an optical axis. The number of the lenses with focal power in the optical lens is seven; the optical lens meets the following conditions:-2 < = F3 / F < =-0.5, 0.25 < = R6 / R7 < = 1.5 and-20 < = F1 / F < = 20, F3 is the effective focal length of the third lens, F is the effective focal length of the optical lens, R6 is the curvature radius of the second side surface of the third lens, R7 is the curvature radius of the first side surface of the fourth lens, and F1 is the effective focal length of the first lens.

The invention provides an optical imaging lens, the optical imaging lens has eight lenses with focal power, and the optical imaging lens comprises a lens group, a spacing element group and a lens barrel group, the effective focal length f7 of the seventh lens and the interval EP67 between the sixth spacing element and the seventh spacing element in the direction of the optical axis of the optical imaging lens meet the following condition: f7 / EP67 is more than or equal to-8.25 and less than or equal to-6.82; the curvature radius R15 of the object side face of the eighth lens and the inner diameter d7m of the image side face of the seventh spacing element meet the condition that R15 / d7m is larger than or equal to 1.31 and smaller than or equal to 2.28. The multi-group optical imaging lens solves the problems that in the prior art, the rear end forming yield of the multi-group optical imaging lens is low, and stray light is serious.

To achieve the above objective, the present invention provides the following technical solution: a handheld magnifier with an adjustable focal length, comprising an upper shell and a lower shell. The upper shell is equipped with a protection plate, a display screen, and a silicone key, while the lower shell contains a PVC film. A battery, a keyboard, a main board, a wave wheel, a sector gear, a lens assembly, and a light board are installed between the upper and lower shells. The lens assembly consists of an FPC cable, a chip, a guide fixing seat, a roller, a lens holder, a lens cover, and a glass sheet. Manual precise focusing is achieved through a mechanical transmission structure consisting of a wave wheel, sector gear, and spiral groove. This structure provides a wide adjustable range of clarity to accommodate observation needs at different distances.

The invention discloses a naked-eye 3D display optimization method based on real-time eyeball tracking, and particularly relates to the technical field of naked-eye 3D display, and the method comprises the steps: capturing eyeball movement data in real time through a visual angle tracking sensor, and collecting illumination information in combination with an ambient light sensor; depth perception parameters are calculated based on pupil diameter variation and frequency, and a time sequence prediction type dynamic compensation coefficient is generated in combination with eyeball movement acceleration; acquiring an initial fixation point coordinate by using an improved spherical projection mapping model, and performing compensation coefficient correction to obtain a real-time coordinate; and finally, according to the real-time coordinates, dynamically adjusting the refractive index distribution of the nanostructure layer, the rotation angle of the polarizer, the focal length of the optical lens and other optical modulation parameters. The real-time distance is calculated through the binocular parallax algorithm, the depth mapping value is generated by combining the focal length of the camera and the baseline distance, the method can adapt to the illumination change and the user view angle, and the 3D display effect is optimized.

The invention discloses a high-power microscope intelligent scanning method for a bone marrow smear, which comprises the following steps: S1, automatically dividing a scanning area: acquiring a bone marrow smear image by adopting a front camera, and selecting an optimal scanning area through a multi-dimensional quality evaluation model; s2, intelligent partitioning and focusing point distribution: dividing an optimal scanning area into N * M sub-areas, determining P focusing sampling points by adopting a layered sampling strategy, and establishing a three-dimensional coordinate mapping table; s3, multi-point focusing data acquisition: according to a preset coordinate mapping table, driving an objective table and an objective lens assembly to move to each sampling point in sequence, and constructing an N * M * P-dimensional focusing data matrix; s4, performing focal plane fitting by a least square method: performing three-dimensional plane fitting on the acquired data; and S5, intelligent scanning imaging: calculating the theoretical optimal focal length of each position in the scanning path according to the fitting function, and driving the objective lens assembly to adjust the focal length in real time for scanning imaging. According to the invention, the scanning area identification accuracy and the image definition uniformity are automatically improved in the whole process.

The invention relates to the technical field of precise positioning, in particular to a corneal topographic map-based full-automatic fixed-focus positioning system, which comprises an optical imaging module for acquiring multi-angle optical signals on the surface of a cornea through an optical device, processing light reflection in different areas, determining the edge of the cornea by using the intensity difference of the reflected light, and calculating the reflection angle and intensity; and identifying the light signal of the key area to obtain light reflection characteristic data. According to the method, accurate analysis of the complex form of the cornea surface is achieved through accurate analysis of the light reflection characteristic data, the accuracy of focal length control is improved, a PID control algorithm is applied, the curvature change data is combined, the high matching degree of focal length adjustment and the cornea surface curvature is ensured, the stability and response speed of focal length adjustment are improved, and the accuracy of focal length adjustment is improved. Through light path deviation correction, imaging errors caused by light path deviation are reduced, and the accuracy, the stability and the imaging quality of automatic focus fixing and positioning of the corneal topography are improved.

The invention discloses a focal length adjusting method and device of an electro-hydraulic focusable lens, equipment and a medium, and relates to the technical field of lens focusing, and the method comprises the steps: obtaining a scene image where a dynamic target is located through a camera, and selecting an area containing the dynamic target as a target area needing focusing; calculating the image definition of the focusing target area; when the image definition is smaller than the image definition threshold value, the focal length of the electro-hydraulic focus-adjustable lens is calculated; and inputting the image definition and the focal length into the electro-hydraulic focusable lens control network model to obtain a focusing current value, adjusting the focal length of the electro-hydraulic focusable lens through the focusing current value, determining the adjusted image definition, and enabling the adjusted image definition to be greater than or equal to an image definition threshold value, and determining an optimal focusing current value based on the adjusted image definition, and performing focal length adjustment on the electro-hydraulic focusable lens according to the optimal focusing current value. According to the method and the device, the optimal focusing of the electro-hydraulic focusable lens can be quickly and accurately realized.

The invention provides an optical imaging device, which comprises a lens group, a spacing element group and a lens barrel, the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a sixth lens which are sequentially arranged at intervals from the object side to the image side of the optical imaging device, and the half Semi-FOV of the maximum half field angle of the optical imaging device and the numerical aperture fno of the optical imaging device meet the following conditions: 1lt; fno / tan (Semi-FOV) < = 1.25; the effective focal length f of the optical imaging device and the effective focal length f1 of the first lens meet the following formula:-2.3 lt; f1 / flt; -1.2,-1.2; the inner diameter d0s of the object side end face of the lens barrel, the inner diameter d1s of the object side face of the first spacing element and the effective focal length f1 of the first lens meet the following condition:-1.45 < = (d0s-d1s) / f1lt; and-0.85. The problem that in the prior art, an ultra-wide-angle and large-aperture optical imaging device is serious in stray light is solved.