2051 results about "Automatic focus" patented technology

In a digital camera, control operations, such as an AF (automatic focusing) operation which is performed immediately after zooming or panning of the camera, can be performed quickly in an appropriate manner. When a zoom lens 3 is driven to zoom “up”(“in”), a control processor and timing generator 40 uses, of imaging conditions data, such as distance measuring data and photometering data, which are obtained at a wide viewing angle before zooming up, a portion of the imaging conditions data corresponding to a “tele” (telephoto) viewing angle after zooming up, to thereby perform AF, AE, and/or AWB operations after zooming up. When the user pans the camera to shift the viewing angle out of the range of the original wide viewing angle, the data of an area of the image plane of the wide viewing angle closest to the image plane of a new post-panning viewing angle is reused. In a digital camera having a plurality of image capturing optical systems which are switched in response to a zoom position, data obtained by the pre-switching image capturing optical system is reused by a selected post-switching image capturing optical system.

The invention relates to an automatic focusing method and apparatus, and belongs to the technical field of photography. The method comprises: during a focusing process, acquiring sound information of an environment; according to the sound information, analyzing a sound source position of the sound information; and performing automatic focusing on a target object at the sound source position. According to the invention, a sounding object is focused through the sound source position; the problem is solved that in a conventional touch control type automatic focusing method, focusing has to be controlled through a touch screen by a user, and in case that the user is at a state when he cannot conveniently operate an electronic device, such as a state when the user holds a tablet device by two hands and a state when the user controls the electronic device by use of a remote controller, automatic focusing cannot be applied; and the effect of normal focusing when the user cannot conveniently operate the electronic device is realized.

The present invention relates to an integrated video camera device and self-adapting automatic focus method. The method includes: using climbing method to a curve composed of an evaluation function evaluating the definition and the definition evaluation values of multiple images acquired continuously, selecting a focus method base on the zooming situation, searching the peak of the curve and driving the lens to reach the focusing position corresponding to the peak of the curve, performing real time motion detection to the lens scenes upon searching the peak, driving the lens motor to startup a new cycle of automatic focus process when a certain degree of fuzzy is judged to appear on the lens scene or the moving scene varies and at a non-focus status. The invention has beneficial effects that the device and the method can effectively determine the focus direction in a variety of zoom magnifications, can 'recognize' images at fuzzy status and accelerate them out of the fuzzy status, and overcomes the problems of the traditional focus method that it is difficult to judge focus direction in the fuzzy region under high magnifications, and the traditional focus method has slow focus velocity and repeated oscillation.

System controller (10) seeks a focus adjusting evaluating value which is indicative of focus adjusting state as a criterion from object image information, and searches a focus adjusted position where focus adjusting evaluating value becomes the most appropriate and drives the focus operating means to the focus adjusted position to perform a focus adjusting by a focus adjusting scan to obtain a plurality of focus adjusting evaluating value by operating the focus adjusting evaluating value detecting means while driving focusing lens (1a) in at lease one way of continuous way or intermittent way which varies focus adjusting state of the object image.

System controller (10) shifts a scan starting point from an initial locating position Po of the focusing lens (1a) in a first predetermined amount of distance in a predetermined direction then initiate scan from the initial locating position toward an opposite direction to the predetermined direction.

An image pickup apparatus which can reduce the time required for automatic focus scanning. The size of the face is determined based on information on a subject's face, which is detected from image data acquired by shooting by an image pickup device. The subject distance is estimated based on the determined size of the face. The depth of field is calculated. A range over which the focus lens is driven varies according to the estimated subject distance and the calculated depth of field.

A variable focus imaging lens assembly for an imaging system of an imaging-based bar code reader for imaging and decoding a target bar code. The lens assembly includes an automatic focusing system for energizing a drive mechanism and imaging system to move a movable lens from the predetermined position along its path of travel and generate a series of image frames; analyzing one or more image frames of the series of image frames to determine a region of interest, the region of interest including an image of a target bar code; analyzing the region of interest in subsequent image frames of the series of image frames to determine an amount of blurring; selecting an image frame from the series of image frames having blurring less than a threshold amount of blurring; and utilizing a decoder to decode the image of the target bar code in the selected image frame.

An intermediate image of an image from the LCD module 142 is deflected by reflection mirrors M1 and M2 via zoom automatic focus control system (g) and then is formed on diffusion glass 131 via relay lens (b) and reflection mirrors M3 and M4. The LCD image is projected on the retina of eyeballs via eyepiece lens 132 by the light flux diffused at an order of ±20 degrees by diffusion glass 131. One side of the eyepiece lens 132 close to the crystal balls 2 has an aspherical shape of a Conic surface and a Conic coefficient of the Conic surface is −1 and less. Thereby the optical system that has a viewing angle of 60 degrees and over and has a small aberration can be obtained.

An object of the present invention is to provide an automatic focusing apparatus which can reduce the time required to detect focused position in accordance with the operating environment by adjusting the voltage applied to a liquid crystal lens. The apparatus includes a liquid crystal lens whose focal length varies with an applied voltage, a liquid crystal lens driving unit which applies a prescribed voltage to the lens, an optical-to-electrical converter which produces an image signal from an optical image passed through the lens, a temperature sensor which detects temperature near the lens, and a control unit which extracts a plurality of focus signals by adjusting the prescribed voltage and controlling the driving unit based on the temperature or on the image signal acquisition period of the converter, and which controls the driving unit based on the extracted plurality of focus signals so that a maximum focus signal is achieved.

An imaging apparatus includes an imaging sensor for performing photoelectric conversion of incident light and a focus control portion for adjusting a focal point based on an image signal obtained by the photoelectric conversion performed by the imaging sensor. The focus control portion includes a change detecting portion for detecting a change in size of a specific subject in a moving image based on the image signal, and adjusts the focal point so that the specific subject becomes in focus with the change taken into account.

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.

A digital imaging device performs automatic focus and exposure adjustments based on high-resolution frames when a scene change has been detected based on the analysis of low-resolution frames. The digital imaging device reduces battery power consumption while simultaneously shortening shutter lag.

The invention belongs to the technical field of vision measurement, in particular to an automatic focusing method. In the method, an idea, which comprises that an image definition evaluation function is designed on the basis of improved discrete cosine transformation (DCT) to represent detail information of the image and highlight high frequency energy, and the relative definition is brought in by consideration of a close relation between the definition of the image and the brightness and the gray scale of the image, is provided. Meanwhile, in the method, a scale-variable window selecting scheme is provided on the basis of analyzing the influence from the selection of a focusing window on a focusing result. Experimental results show that the effect of the improved image definition judgment is improved greatly; in the actual application of the method, a partial extreme value of the image definition judgment is hard to avoid, so, by combining return information of a lens, an improved climbing method search strategy of total-range rough adjustment large step length focusing and partial refine adjustment small step length focusing is provided; and in the method, a scheme of starting automatic focusing when a shooting scene is changed or the lens is zoomed is provided.

The automatic focusing technology is used for finding out optimized focus position in the cases of insufficient background brightness, over large distance between the taken body and the background and varying background during focusing. The automatic focusing process includes the following steps: adjusting the focal length of the lens in the focusing range to obtain one frame of digital image in each relative position; separating the digital image into several regions and finding out the evaluation value for each region; weighting each region; finding out relative position evaluation value to the digital image found for each relative position based on the region evaluation value and region weight; recording the relative position with maximum evaluation value and focusing the lens to the position as optimal focusing position.

A digital camera takes interleaved photographs of two different kinds. In one example embodiment, the first kind of photograph is taken using a first set of pixels of the camera's electronic array light sensor and has a short exposure time. The second kind of photograph is taken using a second set of pixels and has a long exposure time. More than one of the short-exposure-time photographs is taken while each long-exposure-time photograph is exposed. The two kinds of photographs are used for different purposes. For example, one kind may be used for performing automatic focusing while the other kind is used for displaying in a live view display. In this way, live view may continue while automatic focusing is performed. In another embodiment, one kind of photograph is used for providing a live view display, and the other is used in selecting exposure settings for a final photograph.

An auto-focusing device and an electronic image pickup apparatus facilitates realizing a high focusing accuracy and a quick focusing operation simultaneously using an inexpensive plastic lens mount. The auto-focusing device according includes a means for correcting the conversion reference, if necessary, for converting the object distance measured by the open-control range finding means to a focusing position of the focusing lens based on the conversion reference and for moving the focusing lens to the converted focusing position. The electronic image pickup apparatus includes the auto-focusing device.

The invention relates to the technical field of a camera, and especially relates to a miniature optical anti-vibration camera module. The module at least is equipped with a lens, an automatic focusing voice coil motor, an image sensor module and a miniature memory alloy optical anti-vibration actuator. The lens is fixed on the automatic focusing voice coil motor. The image sensor module sends an image obtained by the lens. The automatic focusing voice coil motor is fixed on the miniature memory alloy optical anti-vibration actuator. A control chip drives the automatic focusing voice coil motor to move based on length change of a memory alloy wire on the miniature memory alloy optical anti-vibration actuator, thereby realizing vibration compensation of the lens. According to the module, the module structure is simplified, the cost is reduced, the power consumption is low, through novel layout of a flexible circuit board, the relative movement problem of a moving board and a fixed board is solved, multi-line connection is realized, the technology is simple, the structure stability is high, the integrated height of the module will not be increased, and the product structure is light and miniature.