22results about How to "Improve focus accuracy" patented technology

The utility model belongs to the technical field of water turbine machining, and particularly relates to a robot relief grinding water turbine fixed guide vane tool which comprises a first adjusting mechanism and a second adjusting mechanism, the first adjusting mechanism and the second adjusting mechanism each comprise two bases, adjusting plates are vertically installed on the two bases, sliding supports are connected to the adjusting plates, and the sliding supports are connected to the first adjusting mechanism and the second adjusting mechanism. A bearing plate is connected between the two sliding supports, two adjusting bottom plates are symmetrically arranged on the bearing plate, and a vertically-arranged movable baffle is further arranged on the outer side of the first adjusting mechanism. The tool is suitable for robot relief grinding pumped storage and installation of the fixed guide vane of the mixed-flow water turbine. And through limiting of the tool, the number of times of manual teaching of the robot tool path is effectively reduced, and the working efficiency of automatic relief grinding of the guide vane is improved. Through limiting of the tool, the focusing accuracy of scanning of the three-dimensional camera is improved, then the optimization difficulty after the planning relief grinding path is generated is reduced, and the overall machining quality of the robot for relief grinding of the fixed guide vane is improved.

The invention discloses a simple area array detector focus fixing method adopting a single-hole scanning mode, and belongs to the field of detector image plane focus fixing. The implementation method comprises the steps that a blank screen with a small hole is placed in front of an objective lens, incident light passes through the small hole and then passes through the objective lens to form a light spot, a detector collects a light spot image, and the light spot mass center position is obtained through a mass center calculation algorithm; moving the blank screen in the vertical direction, collecting light spot images at different positions of the small hole, respectively calculating to obtain the light spot mass center position of each light spot image, comparing the light spot mass center position with the initially formed light spot mass center position, and judging whether the detector is in a pre-focus state or a post-focus state at the moment; obtaining a defocusing amount according to a defocusing amount formula; if deviation exists between the positions of the centroids, the installation position is adjusted; if the mass centers of the corresponding light spots are located at the same position of the detector before and after movement, the detector is just located on the focal plane of the objective lens, the detector is installed in place, and simple focus fixing of the area array detector is achieved. According to the invention, the positioning precision can reach one hundredth pixel.

The invention provides an automatic focusing method of an imaging device and an exterior mirror system. The method comprises the following steps: acquiring a working distance between a zoom lens and an imaging target through a distance detection module; determining a focusing search range of the zoom lens according to the working distance, and determining an image acquisition step length according to the working distance and the current focusing definition; and adjusting the zoom lens according to the image acquisition step length, and searching a focusing position in the focusing search range. The working distance between the lens and the imaging target is measured through the distance detection module, the focusing search range is preliminarily locked, invalid focusing outside the focusing search range is avoided, and the focusing efficiency is improved; and the working distance is also used for setting a proper image step length in combination with the current focusing definition, so that the focusing process can cover the peak position of the image definition, the focusing success rate under the conditions of relatively shallow depth of field, relatively high image contrast curve kurtosis and the like is improved, and the situation that the automatic focusing efficiency is limited due to too small step length is avoided.

The invention provides a circularly symmetric Airy beam wavefront phase modulation method based on a multi-focal-length lens. The method comprises the following steps: determining beam parameters of a CAB; calculating the self-focusing focal length d of the CAB; shielding all other light rings except the nth light ring, and solving the diffraction integral of the single light ring so as to obtain a focal length dn; the modulation focal length fn is reasonably estimated according to the difference value between the self-focusing focal length d and the single halo focal length dn, and the modulation focal length fn of each stage of halo is finely adjusted based on the obtained modulation focal length fn of each stage of halo, so that the optimal modulation effect is realized. On the premise that CAB initial light intensity distribution is not changed, higher energy concentration and better focusing characteristics are achieved, and the focusing precision of light beams is improved.

The present application provides a kind of forest tree species classification method, device, electronic equipment and storage medium, belong to artificial intelligence technical field, method includes: forest remote sensing image is input to forest tree species classification model, obtains the output tree species classification result;Forest tree species classification model includes preliminary feature processing module, high-order feature extraction module and tree species classification result output module, high-order feature extraction module is sequentially connected first residual block stack layer, first down-sampling layer, second residual block stack layer, second down-sampling layer, third residual block stack layer, third down-sampling layer and fourth residual block stack layer, stacked residual block embedding dimension rearrangement layer, dimension recovery layer and convolution block attention module.The present application improves the dimension compatibility of CBAM and convolution architecture by embedding explicit dimension rearrangement layer and dimension recovery layer in the residual block embedded with CBAM, effectively improves the classification accuracy of forest remote sensing image for forest tree species classification task.

The application belongs to the technical field of semiconductor lithography, and discloses a mask absorption layer structure with low three-dimensional effect, which comprises a quartz substrate, a bottom anti-reflection layer, an absorption layer main body and a top anti-reflection layer. The bottom anti-reflection layer is deposited on the surface of the quartz substrate. The absorption layer main body is deposited on the side of the bottom anti-reflection layer away from the quartz substrate. The top anti-reflection layer is deposited on the side of the absorption layer main body away from the bottom anti-reflection layer. The absorption layer main body forms a patterned groove structure required for lithography in the XY plane. The absorption layer main body is provided with a partition modulation structure matched with the diffraction characteristics of the patterned groove structure in the Z-axis direction perpendicular to the XY plane, which can adjust the light field distribution of incident light and the phase of transmitted light, eliminate multiple reflections and phase distortion in the groove, reduce the adverse effects of mask three-dimensional effect, improve the lithography focusing precision and pattern size control ability, and meet the lithography application requirements of advanced process nodes.

The utility model discloses a guide rail type focusing device, and relates to the technical field of guide rail type focusing. The guide rail type focusing device comprises a transmission gear, a fixing support, an image sensor and a stepping motor. The transmission gear is in sliding connection with the fixing support, the image sensor is arranged on the fixing support, a spring is further arranged between the image sensor and the fixing support, a driving gear is arranged at the output end of the stepping motor, and the driving gear is connected with the transmission gear in a meshed mode. According to the guide rail type focusing device provided by the utility model, the image sensor is arranged on the fixed bracket, and the fixed bracket performs lifting motion so as to achieve the purpose of focusing. In addition, a guide rail mode formed by the transmission gear and the fixing support enables a guide rail inclined groove and an inclined bone position to be in surface-to-surface contact so as to achieve the purposes of stability and zero clearance, assembly tolerance is reduced, focusing precision is improved, high-speed snapshot is achieved, meanwhile, the whole image is clear and balanced, and the problem that one side of the image is clear and the other side of the image is blurred is solved.

The application relates to a terahertz radar-based focusing imaging method, device, equipment and medium. The method comprises the following steps: obtaining echo signals of a uniformly rotating large-size target based on a terahertz radar, performing distance-direction pulse compression and azimuth-direction FFT on the echo signals to obtain a two-dimensional RD imaging result, estimating the rotation speed and longitudinal distance center offset of the target according to the spatial distribution law of the PSF inclination of each defocused point in the two-dimensional RD imaging result, constructing a final phase compensation function according to the finally estimated rotation speed and longitudinal distance center offset, performing second-order spatially-varying phase compensation and azimuth-direction FFT on a one-dimensional distance image after Keystone transformation according to the final phase compensation function, and obtaining a finally focused RD image. The method can reduce the calculation search amount of terahertz radar RD focusing imaging and improve the focusing accuracy.

The invention discloses an automatic focusing method and device, and belongs to the field of high-precision measurement. The method comprises the steps of setting motion axis parameters, collecting a real-time image, calculating the blurring width of the image and calculating the focusing position. According to the method, the fuzzy edge width is directly calculated, the minimum fuzzy edge width is obtained, and the focusing precision is high. And the focusing height is locally solved, so that multi-height characteristic measurement is more accurate and is not easily influenced by noise. The repeatability is good, and the focusing height with stable image features can be obtained under the condition that the motion axis is not changed.

The invention discloses a camera module and electronic equipment, and belongs to the technical field of camera shooting. The electronic equipment comprises a camera module, wherein the camera module comprises a decorative ring; the lens is arranged on the decorative ring, an emitting part and a receiving part of the laser focusing element are arranged towards the lens, and the laser focusing element and the lens are arranged at an interval in the thickness direction of the lens; the blocking piece is arranged on the laser focusing element, at least part of the blocking piece is located between the laser focusing element and the lens, and at least part of the blocking piece is located between the optical axis of the emitting part and the optical axis of the receiving part so as to block the detection light emitted by the emitting part from being transmitted to the receiving part through the space between the laser focusing element and the lens.

The application belongs to the technical field of water turbine processing, and particularly relates to a positioning method of a robot shovel-grinding water turbine movable guide vane tooling. The positioning method comprises the following steps: installing a short shaft end positioning mechanism; installing a long shaft end positioning mechanism to position the Y-axis direction of a guide vane coordinate axis; hoisting the guide vane to make the short shaft end face of the guide vane adhere to the positioning end face of the short shaft end positioning mechanism tooling, and first perform axial coarse adjustment, then perform axial fine adjustment after the axial coarse adjustment is completed, and position the X-axis direction of the guide vane coordinate axis; position the Z-axis direction of the guide vane coordinate axis; install two jacks to support the left and right ends of a guide vane blade body profile, and adjust the guide vane to limit the rotation of the X-axis of the guide vane coordinate axis. The method can reduce the adhesion degree of the guide vane and the tooling from the level of 1mm-10mm to 0.1mm-1mm, and effectively reduces the number of manual teaching of the robot cutter track through the limiting of the tooling, and improves the working efficiency of the automatic shovel-grinding of the guide vane.

The utility model relates to the technical field of solar light and heat power generation discloses a solar heliostat. The solar heliostat includes: first sub mirror, the distribution of at least two second sub mirrors around the first sub mirror week side, support frame, stand and tracking mechanism, the axis of stand is perpendicular to ground, support frame is located at the top of stand, tracking mechanism is used for driving support frame action, first sub mirror and second sub mirror are located at the side of support frame away from the stand, first sub mirror and support frame fixed connection, every second sub mirror is connected with support frame rotation to the edge part of first sub mirror, the rotation axis of second sub mirror is perpendicular to the arrangement direction of itself and first sub mirror, and is parallel to the mirror surface of first sub mirror, and the part of second sub mirror away from first sub mirror is equipped with support part, and support frame is connected with support part through an adjusting part. The solar heliostat can realize the fast adjustment focal length, and the positioning accuracy is higher, and it is favorable for improving the focusing accuracy of heliostat.

The application discloses a focusing control method and related device, applied to an electronic device, the method comprising: when opening a camera, acquiring a phase difference source image and an initial voltage value corresponding to an initial focusing position; determining a target focusing position; acquiring a target phase difference of the target focusing position according to the phase difference source image; acquiring a target fitting broken line, the target fitting broken line comprising a segment fitting straight line group, and the horizontal coordinate of the target fitting broken line being a voltage value and the vertical coordinate being a phase difference, the segment fitting straight line comprising a‑1 segment points; determining a target fitting line from the target fitting broken line according to the initial voltage value and the a‑1 segment points, the target fitting line being at least one segment fitting straight line in the a segment fitting straight lines; determining a target voltage adjustment amount according to the target fitting line, the target phase difference and the initial voltage value; and adjusting an adjustable focusing lens according to the target voltage adjustment amount. The embodiment of the application can improve the focusing accuracy of the adjustable focusing lens.

The invention discloses a simple area array detector focus fixing method for light beam scanning based on a glass parallel plate, and belongs to the field of optical measuring instruments. The implementation method comprises the steps that a glass parallel plate is placed in front of an objective lens, the parallel plate is perpendicular to a light beam, thin parallel incident light passes through the glass parallel plate and then is focused on a detector through the objective lens to form a light spot, the detector collects a light spot image, and then the position of the light spot mass center is obtained through a mass center calculation algorithm; rotating the glass parallel plate, acquiring light spot images of the glass parallel plate at different rotation angles, and judging whether the detector is in a pre-focus state or a post-focus state at the moment; obtaining a defocusing amount according to the position of the mass center of the light spot; precise focus fixing adjustment is completed by increasing or decreasing gaskets at the installation position of the detector, the increase or decrease of the gaskets is determined or the gaskets are properly ground according to the fact that the detector is judged to be in a pre-focus state or a post-focus state and the calculated defocusing amount, and simple and convenient focus fixing of the detector is completed. The centroid positioning precision of the invention can reach the precision of one percent pixel.

This invention discloses an autofocus method, apparatus, electronic device, and storage medium, belonging to the field of autofocus technology. The autofocus method includes: adjusting the focal length within a first focusing range according to a first preset step size, acquiring a first image captured by the camera at each focal length, and determining an effective focusing area and a second focusing range based on the first image; adjusting the focal length within a second focusing range according to a second preset step size, acquiring a second image captured by the camera at each focal length, and determining the optimal focusing position based on the sharpness evaluation value of the effective focusing area in the second image; wherein the first preset step size is greater than the second preset step size. This invention performs focusing in two stages: the first stage uses a large step size to filter the effective focusing area and narrow the focusing range, and the second stage uses a small step size for focusing and uses fewer but more effective areas for focusing, thus achieving higher operating efficiency.

This invention discloses a method and apparatus for correcting motor offset. The method includes: obtaining the target travel position of the voice coil motor in the Z-axis direction; determining a target sub-interval from N travel sub-intervals based on the target travel position; dividing the travel range of the voice coil motor in the Z-axis direction into N travel sub-intervals, where N is an integer greater than 2; obtaining a first offset coefficient in the X-axis direction and a second offset coefficient in the Y-axis direction based on the endpoint positions and travel distance of the target sub-intervals; and obtaining a first correction position and a second correction position based on the target travel position, the first offset coefficient, the second offset coefficient, and the target sub-interval; the first correction position and the second correction position are the corrected travel positions of the voice coil motor in the X-axis and Y-axis directions, respectively. This invention can correct motor offset caused during the focusing process of a camera module, improving the focusing accuracy of the camera module.

The utility model belongs to the field of microscopes, and particularly relates to an automatic focusing judgment device of a microscope, which comprises an automatic focusing body, an upper connecting cylinder is fixedly mounted at the center of the top of the automatic focusing body, a camera is fixedly mounted at the top of the upper connecting cylinder, and a lower connecting cylinder is fixedly mounted at the center of the bottom of the automatic focusing body. An objective lens is fixedly mounted at the bottom end of the lower connecting cylinder, a U-shaped groove is formed in the center of the interior of the automatic focusing body, the right side of the interior of the U-shaped groove is communicated with the outside, a mounting plate is inserted into the U-shaped groove, and mounting assemblies are arranged between the front and rear surfaces of the interior of the U-shaped groove and the front and rear surfaces of the mounting plate; the mounting plate and the U-shaped groove are mounted through the mounting assembly, and a judgment assembly is arranged in the mounting plate; through the installation assembly, the judgment assembly and the automatic focusing body can be conveniently installed and detached, the judgment assembly is convenient to detach, overhaul and replace, and therefore the device is convenient to use.

The invention provides an ultra-wide-angle small automatic focusing lens and an image pickup device. The lens sequentially comprises a first lens group, an aperture diaphragm, a second lens group with positive focal power and a third lens group with positive focal power from an object side to an image side, in the focusing process, the second lens group moves from the image side to the object side along the optical axis; the lens satisfies the following conditional expressions: 1.5 < F2 / F < 3.5; 8 < F3 / F < 12; f / L is more than 0.05 and less than 0.3; f / H is more than 0.8 and less than 1.5. In the focusing process, only the second lens group moves along the optical axis, the positions of the first lens group and the third lens group are kept unchanged, the focusing mechanism can be simplified, miniaturization is facilitated, and meanwhile the focusing speed and precision can be improved. Furthermore, the aperture diaphragm is arranged on the side relatively close to the object, so that the design effect of considering both miniaturization and ultra-wide angle can be realized; the lens has a large target surface and can be matched with a half-frame camera.

The present application belongs to the field of autofocus technology of microscopic imaging, and relates to a focusing compensation system and method, comprising: an X-direction compensation module, used for adjusting the focusing light beam emitted by a focusing system in the X-direction, so that the focusing light beam is parallel incident to the sample surface after passing through the X-direction compensation and the microscopic imaging system, and is parallel reflected back to the microscopic imaging system, the focusing compensation system and the focusing system; a Y-direction compensation module, used for adjusting the focusing light beam emitted by the focusing system in the Y-direction, so that the focusing light beam is converged on the sample surface together with the working light beam of the microscopic imaging system after passing through the Y-direction compensation and the microscopic imaging system; the X-direction compensation module and the Y-direction compensation module are independently arranged. The present application adjusts the focusing light beam in the X-direction and the Y-direction through the focusing compensation system, and solves the problem that the working waveband of the existing microscopic imaging system is different from the focusing waveband, so that effective autofocus cannot be achieved.

The invention provides an automatic calibration method for a laser welding track of a gapless welding seam, which is characterized in that a track calibration system is adopted; the automatic calibration method comprises the following steps of: 1, importing or generating a preset track; 2, automatic focusing is carried out, a welding head is controlled to move back and forth along a laser processing light path to carry out CCD image collection, the highest definition position of a full-width CCD image is recognized, and the position is set as a reference point; 3, adjusting the posture, and extracting and identifying the light spot form in the CCD image; when the light spot form is abnormal, the posture of the welding head is adjusted; fourthly, the welding track is optimized; and fifthly, welding track inspection is completed. According to the method, coaxial image monitoring is adopted, the problems that position errors are caused by a method of preposed structured light or a laser range finder, seamless welding seams, all-position fillet welding seams or small-diameter pipe butt joint are difficult to recognize, or the precision is reduced due to image splicing are solved, and the cost is obviously reduced compared with a structured light sensor.

The invention discloses a telecentric lens multi-parameter integrated detection method, which comprises the following steps of: after an initial position is manually confirmed, triggering automatic detection through a program, after automatic focusing, moving according to a set path and identifying an upper edge line, then moving rightwards along the line until an angular point 1 appears, then extracting contour features by using an OTSU method and identifying the position of the angular point; recording current coordinates after accurately moving to a corner point 1, starting to move downwards and identifying a right edge line, recording the current coordinates after moving to a corner point 2 along the line and moving to the corner point 2 in the same way, calculating theoretical coordinates of residual corner points according to the obtained accurate coordinates of the corner points and the actual size of the target image, and directly moving to the theoretical positions of the residual corner points; and identifying the position of the angular point and accurately moving the angular point, calculating the magnification, distortion and field curvature value of the lens according to the obtained coordinate data of the target point, and finally displaying the result in a computer equipment interface. According to the invention, the detection efficiency, the focusing precision and the detection stability are improved.