37results about How to "Guaranteed focusing accuracy" patented technology

The invention relates to the field of optical imaging, and discloses a method and device for focusing a camera. In the method and device for focusing the camera, the sizes, positions and priorities of two focusing windows can be set to solve errors of a lens structure, so that the searching speed and accuracy of the optimized focusing position can be improved; the step length of a motor is reduced to a clear zone in a gradient way in the focusing search, so that the focusing speed is improved; rolling focusing is carried out at least twice in a microstep speed reducing way in the clear area, so that the focusing accuracy is completed in the clearest position of an image; and focusing is started at a regular moment when the focusing is fuzzy, so that focusing is effectively ensured to be not focused once again in a scene with contrast ratio. When the optical lens is in an adaptive step length with different magnifications and corresponding settings, different focusing modes can be selected for quick focusing, so that the method can be used for effectively determining whether to start focusing and focusing direction or not in various zooms and scenes, identifying whether the image is in a fuzzy state or not and quickly finding out the clearest point.

The invention discloses a method for quickly and automatically focusing in photographing and a photographing device thereof. The method provides a method for controlling the focus search and a method for rapidly focusing in photographing; a photographing device is provided with a focusing window extraction unit; a window signal of an ingested object image is extracted; an acquired signal is output to a focusing value calculation unit; through the extraction and analysis of the frequency characteristic of a specified window image signal and the calculation and analytic judgment, search rapidly enters an acceleration mode 2 from an acceleration mode 1 and rapidly enters a uniform speed region from an acceleration region till a wave crest, namely the focus position is precisely searched; through a focusing motor controller, a focusing motor is driven so as to realize rapid focusing control; and the method and the photographing device effectively reduce the focusing time of the photographing, simultaneously ensure the focusing precision and stability, successfully solve the problem of contradiction between the high-precision focusing and focusing speed of the photographing device and can be applied to various CCD photographing equipment.

The invention belongs to the technical field of photoelectricity product application, and particularly relates to a quick self-adaptation automatic focusing method. Accurate focusing of a thermal imager is achieved by computing the gradients of an image. A focusing area is selected according to a monitored target, a focusing motor is moved, the gradients of the image in the focusing area are calculated at the different positions, the motor is moved by comparing the gradients till the maximum gradient is obtained, and at that time, the motor position is the target clear imaging position. The quick self-adaptation automatic focusing method is mainly applied to an automatic focusing system of a thermal infrared imager, an area which is large enough is selected from a view field in a self-adaptation mode to serve as the focusing area, sceneries in the area have obvious edge and texture features, the imaging definition is evaluated through an improved laplace function, a search strategy is optimized, a constant step length and changeable step lengths are combined, an improved hill climbing method and a traversing search method are combined, the focusing rate is increased on the premise that the focusing precision is guaranteed, and quick and accurate automatic focusing of the thermal infrared imager is achieved.

The present invention discloses a radiotherapy radiation device and radiation method, which comprises source body(2), pre-collimate body(4), helmet(7), drive assembly and therapeutic bed(12), inside of the source body(2), multiple radiation source focuses ray along radial direction on a public focus on the center axis of radiation device, and the source body(2) and pre-collimate body are connected with drive assembly separately. The radiation method adopts system initiation, which enables the pre-collimate body(4) and helmet(7) to go through the steps of initial zero position, position locating and jointing end to end to implement radiotherapy. The advantages of which lie in the high focusing accuracy of the radiation source(3) and favorable therapeutic effect.

The embodiment of the invention provides a contrast type focusing method and device and electronic equipment, and relates to the technical field of imaging. The method comprises the following steps of: determining the displacement step length of a driving motor according to the relationship between each object distance in a plurality of different object distances of a focusing target and a corresponding image distance; then, obtaining the current position of the lens, and determining the initial position of focusing according to the current position; and finally, controlling the driving motorto push the lens from the initial position according to the displacement step length, and finishing focusing when it is determined that the lens is located at the focus point and the state is a stablestate. Thus, different displacement steps are set according to the relationship between different object distances and image distances, the focusing search time is reduced on the premise of ensuringthe focusing success rate and the focusing precision, and meanwhile, the problem of violent shaking of a preview image during focusing is relieved by setting the initial position of focusing.

The embodiment of the invention discloses a method, device and equipment for calibrating a lens module comprising a voice coil motor. According to the scheme, the method comprises the following steps:acquiring a plurality of calibrated driving current values of a lens module comprising a voice coil motor; acquiring a plurality of calibration object distances that correspond to the plurality of calibration driving current values and represent the distances between the lens module and target images for calibration; and according to the plurality of calibration driving current values and the plurality of calibration object distances, carrying out linear fitting to obtain a mapping function used for focusing the lens module.

The invention provides an optical microscope automatic focusing method based on machine learning, and belongs to the technical field of medical image processing. The method comprises the steps that firstly, images collected by an optical microscope and grouped are represented by designed original features and combined features, and the sequence difference value of a picture and the most clear picture in the group serves as the label of the picture; then the importance of the original features and the combined features is calculated by adopting a random forest composed of regression trees, andthe features with high importance are screened out through multiple times of iteration with the cooperation of set threshold value; data is divided into a training set and a test set by using a leave-one-out method and the screened features to train the gradient boosted regression trees, and finally automatic focusing is carried out on a strong regression device obtained through iterative training.

The present invention relates to a microscope automatic focusing window selection method based on an artificial fish swarm algorithm. An area with the richest details in a whole image is taken as a focusing window selection basis, the artificial fish swarm algorithm is employed to perform search on a whole image to effectively improve the efficiency while ensuring the focusing precision. Image information formed by automatic focusing of a microscope is mapped into the artificial fish swarm algorithm to initialize parameters and initialize a bulletin board, a dynamic balance weighing factor strategy is introduced to update an artificial fish state; and initialized parameters are reset, and a terminal condition is checked. The image is subjected to binarization processing to remain information of an original map and greatly reduce the processing data amount; the dynamic balance weighing factor is introduced to regulate the step length and the field of view of the artificial fish in realtime to improve the efficiency of algorithm; aiming at the problem of the local optimal value of the artificial fish swarm algorithm, after each iteration, the initialized parameters are reset according to the solved optimized solution to effectively enhance the focusing timeliness and ensure the high rate of convergence and algorithm accuracy.

The invention discloses a microscope focusing device based on ultrasonic motor drive. An ultrasonic motor, bevel gears and bevel racks cooperate with one another to electrically control a support plate to move up and down, and the structure is very simple. During usage, the support plate can be controlled to move on any scale under the drive of the ultrasonic motor, so that the clearest focal length can be found out easily. The ultrasonic motor has no inertia during reciprocating, meanwhile, one adjusting mechanism is arranged between one bevel gear and the ultrasonic motor, one adjusting mechanism is arranged between the other bevel gear and an encoder, the bevel gears and the bevel racks can be always meshed closely by the aid of the adjusting mechanisms, and mechanical errors of a traditional structure are avoided when the support plate is controlled to move up and down. The ultrasonic motor, the bevel gears and the bevel racks cooperate with one another, the kinematic accuracy of the support plate is up to plus / minus 2 mu m through experiments, and the focusing accuracy of the focusing device is much higher than that of a traditional focusing structure.

The invention discloses a DCC acquisition method, a DCC focusing method and system, a camera module and a terminal. The DCC acquisition method comprises the following steps: acquiring an image frame set; obtaining a first phase difference and a first definition value of the target image frame; obtaining a target phase difference; acquiring a first displacement of a motor in the camera module; obtaining the current phase difference, the current definition value and the current position data of the moved current image frame; when the current definition value is greater than the first definitionvalue, recording the focusing frequency; and forming a new image frame set according to the current image frame, re-executing the step of obtaining the target phase difference according to the first phase difference until a set condition is reached, and calculating to obtain a target defocusing conversion coefficient according to the current position data obtained after the motor is moved each time and the current phase difference. According to the method, the DCC can be adaptively and dynamically adjusted, so that the focusing precision of a PDAF focusing mode is improved while the focusing time is shortened, and the focusing rate is increased.

The invention discloses a rapid automatic focusing method of a microscope, which comprises the following steps: firstly controlling a coarse focusing screw to drive an objective table to lift for coarse focus adjustment, and then controlling a fine focusing screw to drive the objective table to lift for fine focus adjustment, and the fine focus adjustment comprises the following steps: 1) taking a focusing distance interval obtained by coarse focus adjustment as a basis, a fine focusing screw is controlled to drive the objective table to ascend and descend in the focusing distance interval, images are collected, the definition of the target object is compared through a Tenenggrad gradient function, the clearest image is selected, and the corresponding optimal position of the objective table is obtained according to the clearest image; 2) verifying the optimal position of the objective table obtained in the step 1); and 3) controlling the fine focusing screw to drive the objective table to move to the optimal position of the objective table from the final staying position. According to the invention, the focusing speed and the focusing precision can be ensured, the microscope focusing can be quickly completed under a high magnification, and the focusing time can be greatly saved.

The invention discloses a maskless photoetching system and an image surface focus real-time detection method. The maskless lithography system comprises: a DMD module (101); an illumination module (102) is used for projecting a light beam to the first region (101-1) used for photoetching imaging and the second region (101-2) used for projecting an image surface detection graph of the DMD module (101); a light splitting reflector group (103), a focal plane detection camera module (104) and a photoetching lens (105), wherein the light beam reflected by the DMD module (101) is projected to an exposure substrate (106) coated with a photosensitive material through the light splitting reflector group (103) and the photoetching lens (105); the light is reflected by the exposure substrate and returns to the light splitting reflector set, the light splitting reflector set reflects the light to the focal plane detection camera module, and the focal plane detection camera module judges whether theposition of the exposure substrate is out of focus or not at the moment according to the quality of the collected image.

The invention belongs to the technical field of focusing motors, and particularly relates to a lens driving device and a camera device. The technical problem that an existing guide is stuck is solved. The lens driving device comprises a base; the telescopic lens barrel is used for bearing a lens; the guide post bracket is sleeved on the periphery of the telescopic lens cone and is fixed on the corner upright post of the base; a plurality of guide columns are arranged; one end of each guide pillar is fixed on the base, and the other end of each guide pillar is fixed on the guide pillar bracket; the number of the self-adaptive guide pillar elastic clamps is equal to that of the guide pillars; the self-adaptive guide pillar elastic clamps are fixed on the telescopic lens barrel, and each guide pillar is sleeved with one self-adaptive guide pillar elastic clamp; the guide pillars force the self-adaptive guide pillar elastic clamps to elastically deform, so that the axial leads of the self-adaptive guide pillar elastic clamps are always overlapped with the axial leads of the guide pillars; and the electromagnetic driving mechanism drives the telescopic lens cone to perform axial focusing motion on the optical axis. The method has the advantage that the telescopic lens cone is prevented from being stuck in the focusing motion.

The present invention discloses an image measurement device and an automatic focusing method of an image measurement device. The image measurement device comprises a base, the upper end face of the base is provided with an object carrying platform, a stand column is fixedly installed at the rear end of the base, Z-directional position regulation units are fixedly installed on the stand column, themovable ends of the Z-directional position regulation units are fixedly connected with a lens camera unit, the bottom end of the lens of the lens camera unit directly faces the upper end face of theobject carrying platform; and the image measurement device further comprises a controller configured to control and drive the Z-directional position regulation units and the lens module unit to achieve automatic focusing. The image measurement device and the automatic focusing method of the image measurement device can effectively achieve product measurement and detection.

The invention discloses a camera module test method, device, test drawing board and system, and the method comprises the steps: presetting a test template which comprises a black block and a plurality of black and white alternate annular regions surrounding the periphery of the black block, controlling a camera module to shoot the test drawing board, and adjusting the position of a lens of the camera module till the shooting definition meets a preset focusing condition; and then employing the test drawing board for carrying out optical anti-shake calibration on the focused camera module, so the focusing precision is ensured, and the reliability of OIS calibration is improved.

The invention discloses a focusing method and system for a to-be-measured object, equipment and a storage medium. The focusing method comprises the following steps: acquiring calibration images of the to-be-measured object at different focusing heights; acquiring a distribution relationship between a first focusing degree parameter and a focusing height of each layer of calibration graph according to the calibration image, wherein the distribution relationship is Gaussian distribution; the logarithm of the distribution relation of the multiple layers of calibration graphs is solved, then weighting processing is carried out, and a calibration curve in a linear relation with the focusing height is obtained; obtaining an optimal focusing height reference value; shooting to obtain a to-be-detected image of the to-be-detected object; acquiring a second focusing degree parameter of each layer of calibration graph according to the to-be-detected image; carrying out logarithm solving on the second focusing degree parameter of each layer of calibration graph in the to-be-tested image, and then carrying out weighting processing to obtain a test difference value; and determining the actual height corresponding to the test difference value by using the calibration curve, and calculating the difference value between the optimal focusing height reference value and the actual height as the defocusing amount of the to-be-tested image. According to the invention, the focusing speed is improved while the focusing precision is ensured.

The invention discloses an imaging lens and a mobile device, the imaging lens comprises a lens barrel, a first lens group and a second lens group, the first lens group and the second lens group are movably installed on the lens barrel along the optical axis direction, when the imaging lens works, the first lens group and the second lens group move towards the object side, and the first lens group and the second lens group move towards the object side. And when the imaging lens performs focusing at different object distances, the second lens group moves in the directions close to and far away from the first lens group according to working requirements, and the distance between the first lens group and an imaging surface is not changed, so that the distance between the first lens group and the second lens group is adjusted, and clear focusing at different object distances is ensured. When the imaging lens is in a non-working state, the first lens group and the second lens group move towards the image side, and the length and the volume of the imaging lens are reduced, so that the imaging lens can satisfy the use of the mobile equipment as much as possible.

The invention discloses an automatic focusing method and system. The automatic focusing method comprises the following steps: acquiring an image definition compression base value; completing preliminary focusing; obtaining a fine focusing range; and quickly driving a motor to rotate according to the fine focusing range, and traversing the definition ratio of each image in the fine focusing range until the image position with the maximum image definition ratio is determined, so as to complete automatic focusing. According to the invention, rapid focusing can be realized, the fine focusing range is small, the focusing precision is high, and the customer experience is good.