273results about How to "Fast focusing" patented technology

The invention discloses an automatic focusing microscope based on an eccentric beam method and a focusing method thereof. The hardware comprises an eccentric beam defocus amount detection module, a microscopic imaging module, a piezo lens drive, an XY stage and a computer processing system. The defocus amount detection module transmits a semicircular laser beam to irradiate the surface of a sample and acquire a semicircular spot image formed by sample reflection. The computer processing system uses self-adaptive median filtering, Canny edge detection based on OSTU, the least square fitting and other algorithms to process the grayscaled spot image to acquire spot radius. According to a radius-defocus amount linear relationship model, the sample defocus amount in a field of vision can be calculated. The piezo lens drive drives a lens to compensate the defocus amount. After focusing, the microscopic imaging module acquires a clear sample image. The automatic focusing microscope based on the eccentric beam method and the focusing method thereof, which are provided by the invention, have the advantages of fast focusing speed, high focusing accuracy and large linear range, and can meet the requirement of fast and precise focusing of the microscope under a high power lens.

The invention is applicable to the field of communication, and provides a focusing method and device. The method comprises the following steps: when dual cameras of a mobile terminal accesses preview, collecting a first image and a second image, which both include target points, through a first camera and a second camera of the dual cameras; processing the first image and the second image according to the parallax principle; calculating the distance between the target points and a photosensor; and obtaining the optimum focal distance of lenses and the photosensor according to the focusing algorithm, and directly moving the lenses of both the first camera and the second camera to the optimum focusing position in one step. The focusing method and the focusing device are quick in focusing speed, good in experience and more humane.

The invention which relates to an optical instrument and detection imaging technique discloses a large field depth iris image acquisition system and a method based on a plurality of fixed-focus cameras. The system comprises an iris image collecting device and an image recognition device. The method comprises the following steps: respectively imaging the iris by means of the fixed-focus cameras having different imaging object distance ranges and producing a multi-path fixed-focus image results; choosing one or a plurality of multi-path fixed-focus image results through distance measurement or image quality evaluation method; carrying out image processing and identification of chosen qualified iris image data. The invention effectively integrates the imaging ranges of different fixed-focus cameras in the mode of self-adapting switchover, thereby taking advantages of the cameras and at same time removing disadvantages of the cameras, enlarging the integral imaging range of the acquisition system, and improving the feasibility of an iris recognition system. Compared with the prior iris imaging method adopting a zoom camera, the invention has the advantages of low cost, quick and noiseless focusing.

The invention discloses an auto focusing method comprising following steps: driving the lens to move in the whole range can be reached with a predetermined step width, obtaining an image at the initial position of the lens and at the position of each step of the lens; comparing each obtained image, memorizing corresponding lens position, and calculating the fractal dimension value of each pixel in a certain area therein; calculating the image evaluation value by using the fractal dimension value, thereby obtaining an image evaluating sequence; finding out the maximum value, and the values corresponding to the front and post n (n is a positive integer) steps in the sequence, making a parabolic curve according to the 2n+1 evaluating values and the corresponding lens position values; and calculating the corresponding lens position of the parabola vertex which is the lens focusing position. The invented auto focusing method can analyze image detail information well with good adaptability, focusing accuracy is increased, focusing position can be found out quickly, and the invented method can be used broadly in diversified cameras.

The invention discloses an optical anti-jitter voice coil motor, comprising a shell and a base connected with the shell, wherein an upper gasket, an upper shrapnel, a lower gasket and a lower shrapnel are arranged in the shell; a center through hole is formed in the upper end face of the shell; and a lens carrier is arranged in the center through hole. The optical anti-jitter voice coil motor is characterized in that the top of the lens carrier is connected with the upper gasket, and four corners of the upper gasket are connected with the lower gasket via suspension wires; the lower gasket is connected with the bottom of a coil frame, and the top of the coil frame is connected with the inner ring of the upper shrapnel; the outer frame of the upper shrapnel is connected with the top of a magnet frame; a first coil is arranged on the side wall of the coil frame, and a second coil is arranged on the side wall of the lens carrier; the first coil corresponds to a first magnet, the second coil corresponds to a second magnet, one of the first magnet and the second magnet is a unipolar magnet, while the other one is a bipolar magnet. The optical anti-jitter voice coil motor has the advantages of simple structure, low production cost, power saving and multi-degree-of-freedom jitter prevention.

The invention discloses a focusing method and a focusing system based on a distance sensor of a mobile terminal. The focusing method comprises the following steps of detecting that a camera shooting function of the mobile terminal is started; acquiring and storing the distance between a current camera and an object to be shot by using the distance sensor; judging a current distance between the camera and the object to be shot is the same with a previous distance between the camera and the object to be shot or not by using the distance sensor; inquiring a pre-stored focusing fine adjustment range table so as to obtain a fine adjustment range of a motor according to the current distance if the current distance between the camera and the object to be short is the same with the previous distance between the camera and the object to be shot; controlling movement of the motor in the fine adjustment range; acquiring images in real time; acquiring focusing values of the images acquired by the motor moving at different positions in the fine adjustment range; and controlling the motor to move to a position at which the focusing value is maximum so as to finish focusing. When the object moves, the focusing system is triggered to focus; and because the focusing fine adjustment range is preset, an optimal focal distance can be found out by comparing a few of frames of images, the focusing speed is increased, and the focusing method and the focusing system bring convenience to a user when the user takes photos.

The invention relates to a micrometer-level particle high-throughput concentration microfluidic device with adjustable and controllable treatment throughput. The microfluidic device comprises three modules; a fluid separating module is used for uniformly distributing samples into function modules according to the flow rate requirement; each layer of function module is formed by bonding an upper template and a lower template, the sample flows into the corresponding modules via an entrance of each layer and is treated by a spiral flow channel, and target liquid and waste liquid are respectively guided out of two exits; the whole device can realize the vertical stacking of the multiple function modules via the upper and lower bonding mechanism of a Lego model, and the target liquid and waste liquid outlets of each layer are respectively positioned on convex cylinders of the Lego, and are vertically communicated; under the lowermost layer of function module, a bottom fluid collecting module is stacked, and the target liquid and the waste liquid are respectively gathered and then flow out. The microfluidic device has the advantages that by adopting the mcirofluid channel structure, the samples with different treatment throughputs can be quickly concentrated by the Lego module with adjustable layer number, the concept of fixed treatment throughput in the single microfluidic chip is broken through, and the effect of high throughput and continuous fluid concentration of micrometer-level biological particles is realized by the microfluid inertial effect.

The invention provides an automatic tracking and focusing method and system for an integrated camera. A target object area is arranged, the proportion of the FV of the target object area is made to be larger than the proportion of the FV of a non-target object area, a focusing lens is driven to move, then, final searching judgment is performed, and finally, focusing is completed. The problem that the focusing position and actual expectation are not consistent when imaging is performed through the camera in a traditional 'hill climbing method' is solved, the focusing speed is high, and consumed time is short. After focusing, the target object area is tracked, and therefore the movement or position of a target object can be estimated, the focusing direction and the focusing area can be affirmed, focusing is triggered again when the target object area becomes vague or the displacement of the target object exceeds a determined threshold value, and it is guaranteed that automatic focusing is accurate. A step length changing searching method is adopted, efficiency can be improved, and automatic focusing speed is increased. A self-adaption estimation algorithm of an FV threshold value of a peak value area is adopted, and therefore automatic focusing can be faster.

The invention discloses an automatic focusing method and device. The method comprises the steps that after a user clicks a target object in a viewfinder to complete manual focusing, first spatial data of the target object are obtained; when it is detected that the viewfinding content in the viewfinder changes, position changing data are obtained; according to the first spatial data and the position changing data, second spatial data of the target object are calculated; the target object is automatically focused according to the second spatial data. By the application of the automatic focusing method and device, in the user photographing process, if the viewfinder moves and the target object does not move out of the viewfinder, the target object can be automatically focused, so that the manual focusing operation during viewfinding content changing is avoided, the focusing operation process is simplified, the focusing speed is increased, and the user photographing experience is improved correspondingly.

The present invention discloses a mobile terminal and a focusing method. The mobile terminal comprises a distance measuring sensor used for sensing an object in an environment and outputting the sensing data representing the position of the object in the environment; a controller used for determining an object distance parameter of the object formed relative to a camera based on the sensing data, and determining an image distance parameter used by the camera based on the object distance parameter; the camera used for adjusting the distance between a lens of the camera and an image plane corresponding to the camera under the control of the controller and based on the image distance parameter. According to the present invention, the automatic and rapid focusing of the camera can be realized.

An auto focus (AF) method adapted to an AF apparatus is provided. The AF method includes following steps. A target object is selected and photographed by a first image sensor and a second image sensor to generate a first image and a second image. A procedure of three-dimensional (3D) depth estimation is performed according to the first image and the second image to generate a 3D depth map. An optimization process is performed on the 3D depth map to generate an optimized 3D depth map. A piece of depth information corresponding to the target object is determined according to the optimized 3D depth map, and a focusing position regarding the target object is obtained according to the pieces of depth information. The AF apparatus is driven to execute an AF procedure according to the focusing position. Additionally, an AF apparatus is provided.

The embodiment of the invention provides a focusing method and a mobile terminal. The method is applied to the mobile terminal having a first camera and a second camera. The method comprises the steps of acquiring first focusing data of the first camera during a preview image collection process of the second camera; and converting the first focusing data into the second focusing data, and arranging the data into the second camera, wherein the number of pixel points used for focusing in the first camera is more than that of the pixel points used for focusing in the second camera. According to the method and the mobile terminal provided by the embodiment of the invention, the problem that a part of area cannot support phase focusing as the part of area lacks of the focusing pixel points is solved while imaging quality is not reduced, and accuracy of phase focusing is improved; when no-delay photographing or picture recording is performed, no-delay photographing speed and focusing speed in picture recording when a focus changes are improved, and thus the picture recording effect when the focus changes becomes better.

The present invention relates to a method for safe landing area searching of a mini-type unmanned autogyro through adoption of a monocular focus-adjustable liquid state lens. The realization operation steps comprise: (1) an autonomous landing unmanned aerial vehicle is hovered at a proper distance above an alternative landing area, the liquid state focus-adjustable lens view field is divided into an upper left area, a lower left area, an upper right area and a lower right area, images are collected and a sharpness evaluation function is employed to perform evaluation of the sharpness values of the images of the four areas, the focal length of the lens is traversed, driving current corresponding to different lens focal lengths and image sharpness values of the corresponding four areas are stored and recorded; and (2) data stored in the step (1) is inquired, a current value corresponding to the maximum value of the sharpness of the four areas is compared so as to determine whether a selected area is suitable for landing or not. The method employs a monocular focus-adjustable liquid state lens, is simple in structure, small in power consumption, fast in focusing speed and simple and effective of the realization of the algorithm. The method provided by the invention can satisfy the searching of a proper landing area in the autonomous landing process of the mini-type unmanned autogyro.

The invention relates to a focusing technology of imaging equipment, and discloses a continuous focusing method and device. The continuous focusing method comprises the following steps: acquiring a change tread of an area of a focus target in a current image relative to an area of a focus target completed in the previous in-focus in the image, wherein the focus target is a photographed object; according to the change tread of the area of the focus target in the image, recognizing a direction of motion of the focus target; if the area of the focus target in the image is in an increasing tread, then recognizing the direction of motion of the focus target is close to imaging equipment; if the area of the focus target in the image is in a decreasing tread, then recognizing the direction of motion of the focus target is away from the imaging equipment; and adjusting a position of the focus until in-focus again according to the direction of motion of the focus target. Compared with the prior art, the continuous focusing method and device provided by the invention can improve the focusing speed.