189results about How to "Reduce focusing time" patented technology

Disclosed is an auto-focus apparatus including an evaluation value calculator periodically calculating evaluation values using high frequency components of image signals in a specific region of a subject image, a distance measurement unit measuring a distance to a subject and output a distance measurement result, a control unit outputting instruction values based on the evaluation values and determines whether a subject image is in-focus or out-of-focus, and a storage storing the distance measurement results and lens positions. In the apparatus, after searching the peak of the evaluation values, the control unit returns the lens to the position at which the relative maximum has been detected, obtains evaluation values, stores lens positions and distance measurement results when the evaluation values satisfy a prescribed condition, and retrieves distance measurement results and lens positions when the number of times that results are stored reaches a prescribed number, and computes a correction amount.

A system for imaging of the central and peripheral retina, includes one of a concave mirror and an elliptical mirror having an axis and being configured to rotate around the axis and a scanner configured to using a spectral domain optical coherence tomography system to obtain a non-contact wide angle OCT-image of a large portion of the central and peripheral retina.

A motion control device for controlling a motor is presented. The motion control device is operable to scale or adjust an input relative to an input range that is based on calibration values and to use that scaled input to produce a drive signal to drive the motor. The motion control device performs a self-calibration to produce the calibration values. The self-calibration involves measuring home position and full travel position values for the motor.

The present invention provides a control device capable of improving hysteresis characteristics of a voice coil motor (31) and attaining a suitable lens position without complicating the structure of the control device. As solving means of the invention, a voice coil motor control device (30) includes a driving current control part (34) that controls a driving current supplied to the voice coil motor (31) in accordance with a driving pulse subjected to pulse width modulation, and a driving pulse control part (32) that divides a drive period of the voice coil motor (31) into a movement period and a holding period, and controls the driving pulse by changing the duty ratio of the driving pulse during the movement period in accordance with a duty setting value and fixing the duty ratio of the driving pulse during the holding period to the duty setting value.

An apparatus and method for automatically focusing a lens of a digital imaging device, such as a digital still or video camera or camera phone, that reduces the auto focus time while not compromising image sharpness quality and simultaneously reducing device power consumption due to focus actuator movement, all without tuning or adjustment of thresholds or parameters is disclosed. The present invention automatically computes a set of digital band-pass filters matched to the imaging device specifications along with corresponding step-size magnitudes. A filter-switching search for the in-focus focus actuator position is formulated such that filters are switched and step-sizes are reduced as the search gets closer to the in-focus position by utilizing local estimates of the first and second-order differential information of the focus value surface.

In a face recognition apparatus adapted to recognize an input face image on the basis of one or more registered face images, similarity between an input face image and a registered face image is determined based on a Gabor jet calculated by performing Gabor filtering using Gabor filters defined by a Gaussian function representing a window and sine and cosine functions representing a frequency response for each of predetermined frequency values and for each of predetermined angles of the response function. Values of the filter window are calculated in advance based on the Gaussian function and stored in a filter window data ROM. Values of the response function are calculated in advance for respective angles based on the sine and cosine functions and stored in sine data ROMs and cosine data ROMs. In the Gabor filtering process, coefficients of the Gabor filters are determined from values read from these ROMs.

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 automatic camera focusing method includes preset several evaluation values and possible focus ranges based on environment brightness value before initial scanning; coarse focusing in the possiblefocus ranges one by one until finding the focus range; fine focusing in the found focus range; and making the lens return to the peak position found in fine focusing. By means of the focus forecasting technology and simplified motor shifting process, the present invention has short focusing time and needs no manual focusing.

The application relates to a microscope focusing method and apparatus, a computer apparatus, and a storage medium. The method includes: collecting a coarse focusing image of a microscope; evaluating the image sharpness of the coarse focusing image; determining a coarse focusing position and a focusing adjustment direction according to the image sharpness; acquiring a fine focusing image, being animage shot by the microscope based on the coarse focusing position, of the microscope; and according to the fine focusing image, determining an optimal focusing position. According to the embodiment of the application, the optimal focusing position can be searched directly in the search range determined according to the coarse focusing position; repeated multi-focusing is avoided; the focusing time is saved; and the focusing efficiency is improved.

Even when a point light source is present in a subject or a normal subject is erroneously determined as a point light source in determination of the presence or absence of a point light source, the following is implemented: the driving time of a focus lens is shortened and quick focusing operation is provided. The optimum focus lens stroke is computed based on information on a high-brightness region and a low-brightness region in an image. Then the focus lens is driven while the focus lens stroke is continuously varied based on the amount of change in high-brightness region and low-brightness region.

The invention provides a focusing method and electronic equipment. The electronic equipment comprises a processor and at least two cameras, wherein a first camera in the at least two cameras is used for detecting phase information of an image; a second camera of the at least two cameras is used for detecting contrast information of the image; the processor is used for determining at least one phase focusing position of the second camera according to one or more phase focusing positions of the first camera in the phase detection and automatic focusing process of the first camera, and controlling the second camera to move to the at least one phase focusing position; and determining a contrast focusing position of the second camera according to contrast information of an image detected by thesecond camera at one or more phase focusing positions in the at least one phase focusing position, the contrast focusing position of the second camera comprising a contrast focusing movement direction of the second camera. According to the embodiment of the invention, rapid focusing can be realized.

The invention provides a mobile terminal and a quick focusing method for photographing with the mobile terminal. The quick focusing method comprises the steps as follows: starting a camera and an application program corresponding to the camera; opening a photographing preview interface of the application program and displaying an image to be displayed; controlling the lens of the camera to focus at a preset object distance range; and obtaining a focusing method and finishing the shooting. The quick focusing method for photographing with the mobile terminal controls the lens of the camera to focus in the preset object distance range and sets a plurality of quick focusing distances from the infinite object distance to the set distance. Each quick focusing distance corresponds to a group of operation shortcut keys, and the lens is directly moved to the corresponding focusing distance to focus while the camera needs to perform quick focusing. In comparison with global search from infinity to micro distance while searching an optimal focusing point in an automatic focusing process in prior art, the method of the invention greatly reduces focusing time and realizes the quick focusing of the camera so as to meet a photographing requirement of the user to a snapshot.

The invention discloses a focusing method and device, an electronic device and a storage medium. The method comprises the steps of using a ball machine to determine a target identification point closest to the space of a target object according to the second coordinate information of the target object and the third coordinate information of each identification point; pre-storing the corresponding relation between each identification point and the focal length in the ball machine, taking the focal length corresponding to the target identification point as an initial focal length after determining the target identification point, and determining the focal length corresponding to the target object according to the initial focal length and a preset focusing step length. The determined target identification point is closest to the object distance of the target object, so that the target identification point is closest to the focusing focal length of the target object, and the rapid focusing can be realized by focusing on the basis of the initial focal length corresponding to the target object. Compared with a focusing scheme in the prior art, the focusing time is greatly shortened, and the snapshot efficiency is improved.

The invention relates to a camera shooting module assembling method, which comprises the steps of providing a circuit board and a lens module, wherein one end of the circuit board is provided with a connector, the other end is provided with a line board, the line board is provided with a photosensitive chip and a bracket covering the photosensitive chip, an optical fiber is accommodated in the bracket, and the lens module is a voice coil motor combined with a lens; adjusting the lens module so as to enable the lens to be focused to the photosensitive chip and enable an optical axis of the lens to be aligned to a central normal of the photosensitive chip; providing a curable adhesive, coating the upper surface of the bracket with the curable adhesive; pre-pressing the lens module and the curable adhesive; adjusting the lens module again so as to enable the optical axis of the lens to be aligned to the central normal of the photosensitive chip; and laminating the lens module and the bracket, and curing the curable adhesive. The invention further provides a camera shooting module. By adopting the camera shooting module assembling method, the assembling efficiency can be improved, the imaging quality of the camera shooting module can be ensured, and an adhesion force between the lens module and the bracket can be increased.

A focus control apparatus and method capable of shortening a focus adjustment time in focus control. The method includes extracting a first high frequency component depending upon a first cutoff frequency and a second high frequency component depending upon a second cutoff frequency higher than the first cutoff frequency from a video signal, generating first and second contrast signals of the video signal respectively based on the first and second high frequency components, using a quotient obtained by dividing a value of the first contrast signal by that of the second contrast signal as a parameter, exercising focus control based on the parameter, and setting the first and second cutoff frequencies so as to cause a value of the parameter to assume a peak when a focus lens in an image pickup apparatus is located in a position at a predetermined distance from an in-focus position.

The invention relates to a digital camera fast focusing method using a step motor to control an image acquisition unit on optimum focusing viewfind position, which comprises following steps: a), setting step motor to control image acquisition unit on viewfind position with at least a first, a second and a third viewfind point; b) viewfinding on viewfind position to calculate resolution ratio and generate at least a first, a second and a third resolution ratio; c) comparing these resolution ratios to determine the region of optimum focusing viewfind position; d) calculating optimum focusing viewfind position according to viewfind position.

A projector including a light modulating device which modulates light beams emitted from a light source according to image information to form an optical image, a projection optical device, the projection optical device including a projection lens which has a plurality of lenses and enlarges and projects the optical image onto the screen, a focal position changing unit, to perform focus adjustment on the image, a setting input unit through which automatic adjustment information for changing the focal position to an in-focus position where the projected image is in an in-focus state is input, and a focus adjustment control unit which controls the focal position changing unit until the projected image is in the in-focus state.

The invention discloses a phase focusing method and device thereof. The method comprises the following steps: dividing a focusing region into multiple sub-regions, and respectively computing the phasedifference and credibility of each sub-region; and dynamically matching a corresponding weight table according to the phase difference and credibility of each sub-region, and obtaining the corresponding weight value through table look-up; and finally, computing the phase difference and the credibility of the focusing region by combining the weight value obtained through table look-up, and then controlling a motor to perform automatic focusing according to the computed phase difference and credibility of the focusing region. In the method disclosed by the invention, the focusing region is divided into multiple sub-regions, the phase difference and the credibility of each sub-region are respectively computed, and the phase difference and credibility of the focusing region are obtained by performing weight summing in combination with the weight value, and the appropriate weight value can be selected according to different depths of field, thereby effectively utilizing the information with high credibility, effectively improving the focusing precision and shortening the focusing time.

The invention provides a projector automatic focusing system and a method thereof. The projector automatic focusing system includes an area selector module, a focal length setting module, a resolution calculation module, a contrast module and a control module, wherein the area selector module is used for selecting at least one analysis area on a projection face, the focal length setting module is used for setting a plurality of focal lengths within a focusing range of a lens, the resolution calculation module is used for computing resolution of the lens respectively at the end of each focal length within the focusing range, the contrast module is used for comparing the resolutions obtained by calculation to obtain the focal length of the end corresponding to the maximum resolution, the selector module is further used for selecting a plurality of sites within the obtained focal length, the resolution calculation module is further used for comparing the resolutions at the selected sites of the lens to obtain a site position corresponding to the maximum resolution, and the control module drives the lens to the position of the obtained site through a control motor. With the projector automatic focusing system and the method thereof, the focusing time can be saved and the focusing accuracy can be increased.

A camera module and an auto focusing method of the camera module are provided, the camera module including a VCM (Voice Coil Motor) including a rotor including a lens distanced from a reference plane, in a case no driving signal is applied, a posture detection sensor determining a posture of the VCM; an ISP (Image Signal Processor) generating a driving signal for driving the VCM using an optimum focus value of the lens calculated by an auto focus algorithm in response to a posture of the VCM determined by the posture detection sensor, an image sensor changing lens-passed light to a digital signal, and a controller controlling the VCM, the posture detection sensor, the image signal processor and the image sensor.

Disclosed is a camera system, the camera system including a first camera photographing an object image, a second camera including an actuator moving a lens for focusing, a 3-D depth extraction unit extracting a 3-D depth using object images photographed by the first and second cameras, a memory unit stored with position information of a lens corresponding to a 3-D depth data of an object image, and a controller driving the actuator by reading the position information of the lens corresponding to the 3-D depth of the object image stored in the memory unit based on 3-D depth data extracted by the 3-D depth extraction unit.

The present invention discloses an image collection device and method. The device comprises: a focusing unit configured to drive a first camera and a second camera, wherein the first camera is driven to set the focal length of the first camera to be infinity, and the second camera is driven to perform focusing; a determination unit configured to determine whether the second camera is successfully focused or not; an image collection unit configured to collect a first image through the first camera and collecting a second image through the second camera after the second is successfully focused. The image collection device and method allow a color camera to be directly pushed on the far focusing and allow a black and white video camera to perform normally focusing so as to reduce the focusing time and the risk of the focusing failure of the night mode shooting without adding the hardware technology difficulty.