5852 results about "Zoom lens" patented technology

An aerial reconnaissance system generates imagery of a scene that meets resolution or field of view objectives automatically and autonomously. In one embodiment, a passive method of automatically calculating range to the target from a sequence of airborne reconnaissance camera images is used. Range information is use for controlling the adjustment of a zoom lens to yield frame-to-frame target imagery that has a desired, e.g., constant, ground resolution or field of view at the center of the image despite rapid and significant aircraft altitude and attitude changes. Image to image digital correlation is used to determine the displacement of the target at the focal plane. Camera frame rate and aircraft INS / GPS information is used to accurately determine the frame to frame distance (baseline). The calculated range to target is then used to drive a zoom lens servo mechanism to the proper focal length to yield the desired resolution or field of view for the next image. The method may be performed based on parameters other than range, such as aircraft height and stand off distance.

A digital camera includes a first image sensor, a first wide angle lens for forming a first image of a scene on the first image sensor; a second image sensor, a zoom lens for forming a second image of the same scene on the second image sensor, a control element for selecting either a first sensor output from the first image sensor or a second sensor output from the second image sensor, and a processing section for producing the output image from the selected sensor output. In one variation of this embodiment, the first lens is also a zoom lens, where the maximum focal length of the first lens is less than or equal to the minimum focal length of the second zoom lens.

An imaging device has a zoom lens system having a plurality of lens units and forming an optical image of an object so as to continuously optically zoom by varying distances between the lens unit; and an image sensor converting the optical image formed by the zoom lens system to an electric signal. The zoom lens system has from an object side, a first lens unit being overall negative and including a reflecting surface that bends a luminous flux substantially 90 degrees; and a second lens unit disposed with a variable air distance from the first lens unit, and having an optical power, and wherein at least one lens element made of resin is included in the entire lens system.

A zoom lens, includes, in order from an object side to an image side, a first lens unit of negative refractive power, the first lens unit having an aspherical lens of negative refractive power, a stop, a second lens unit of positive refractive power, the second lens unit having an aspherical lens of positive refractive power, and a third lens unit of positive refractive power, wherein, during zooming from a wide-angle end to a telephoto end, the second lens unit and the stop move in unison toward the object side, and the first lens unit so moves as to compensate for a shift of an image plane resulting from the zooming.

A system and method for correcting distortions that occur in image capture systems is disclosed. The present invention in some preferred embodiments includes provisions to correct or change magnification differences for all causes including position errors in zoom lens positioning mechanisms as well as those caused by chromatic aberration, CCD alignment errors, lens distortion off center variations, pincushion / barrel lens distortion, magnification distortions, camera and lens misalignment errors, and lighting variations (including flash-to-flash illumination variations). A significant feature of the present invention in contrast with the prior art is that with the use of a movable calibration plate in the present invention it is possible to image capture both the calibration plate and the input object image in a single image capture, thus permitting simultaneous compensation for a variety of lighting and illumination variations not possible with the prior art.

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.

Provided are a method and apparatus for taking images using a mobile communication terminal with a plurality of camera lenses, that can visually emphasize the shape of an object by photographing a specific object and its surrounding background using a zoom lens and a wide-angle lens, respectively, and combining the photographed images. The method includes setting the mobile communication terminal to an image-taking mode, entering into an image-combining mode, operating the plurality of camera lenses, setting an object, taking images using the plurality of camera lenses, and combining together the images obtained using the plurality of lenses. The method and apparatus enables visual emphasis of a specific object in an entire image by photographing the specific object with a zoom lens and a background containing the object with a wide-angle lens, and then combining the photographed images so as to display the specific object at a higher magnification ratio than that of the background.

An optical system for a remote video inspection device including an elongated probe for inspection of target objects, comprising: an imager located distally within the probe, wherein the imager receives an image of the target object; a focus lens group located within the probe, the focus lens group comprising a variable aperture and at least one focus lens; a zoom lens group located within the probe, the zoom lens group comprising at least one zoom lens, wherein the movement of the zoom lens group in relation to the imager changes the magnification of the image; a tip lens located further from the imager than the focus lens group and the zoom lens group, wherein the distance between the tip lens and the imager is fixed; wherein a first movement of the focus lens group proportional to the movement of the zoom lens group provides an initial image focus, and a second movement of the focus lens group independent of the movement of the zoom lens provides a final image focus and proportional changes to the size of the variable aperture.

A digital camera has a first optical system having a wide zoom lens and a second optical system for a telephotography zoom lens. In an initial state where power is active, a controller and timing-generator controls the wide zoom lens so as to be situated at a wide position and the telephotography zoom lens so as to be situated at a telephotograph position. When zoom-in is effected, the wide zoom lens is actuated, and the telephotography zoom lens is maintained at the telephotograph position. When a zoom position of the wide zoom lens has reached a threshold zoom position set to a wider angle of view than that achieved at the telephotograph position, the telephotography zoom lens starts being actuated toward the wide position. When the zoom lens has reached the telephotograph position, an image signal is switched from the wide zoom lens to the telephotography zoom lens, and the selected image signal is output.

A moving object monitoring surveillance apparatus that controls a camera using a motorized panhead and a motorized zoom lens to identify correctly a moving object, particularly, a person is disclosed. The apparatus includes a video device acquiring information of the image of a moving object as a video signal, a panhead for panning and tilting the video device, a frame grabber for extracting, frame by frame, a still image from the video signal output from the video device and binarizing the still image into frame data, a plurality of frame memories for alternately storing the binarized frame data, a CPU for controlling the operation of the panhead and for processing the frame data, and an image database for storing the processed data. The video device sequentially monitors at least one single surveillance area. The CPU compares frame data with immediately prior frame data to determine a difference therebetween, tracks coordinates corresponding to the difference if the difference is detected, and detects and expands a particular color.

An image capture apparatus includes: a zoom lens arranged in a housing and including fixed lens groups, movable lens groups and at least three prisms; and an imager device arranged in the housing. The zoom lens includes: a fixed first lens group including a negative lens group having a first optical axis, a first prism approximately perpendicularly folding an optical axis, and a positive lens group having a second optical axis folded by the first prism; movable lens groups and at least one fixed lens group arranged along the second optical axis to perform a zooming action, an image plane position correcting action and a focusing action; and a second prism arranged on an image side relative to a movable lens group that is a closest to the image side among the plurality of movable lens groups for approximately perpendicularly folding the optical axis.

A wide-angle zoom lens with as few as two plastic elements codes the wavefront produced by the imaging system such that the imaging system is substantially invariant to aberrations related to misfocus. Signal processing is used to decode the wavefront to form the final image. A first type of zoom lens configuration uses as few as two lens elements. In this type, image processing may be modified to take into account the positioning of the lenses.

The invention provides a zoom lens system which achieves a wide angle of field, has a simplified construction, and is suitable for use on video cameras. The zoom lens system comprises, in order from an object side thereof, a first lens group G1 having positive refracting power, a second lens group G2 having negative refracting power, a third lens group G3 having positive refracting power, and a fourth lens group G4 having positive refracting power. The second lens group G2 moves toward an image side thereof while the third G3 and fourth G4 lens groups move constantly toward the object side for zooming from a wide-angle end thereof to a telephoto end thereof. The first lens group G1 consists only of a positive single lens.

A digital camera includes a first image sensor, a first wide angle lens for forming a first image of a scene on the first image sensor; a second image sensor, a zoom lens for forming a second image of the same scene on the second image sensor, a control element for selecting either a first sensor output from the first image sensor or a second sensor output from the second image sensor, and a processing section for producing the output image from the selected sensor output. In one variation of this embodiment, the first lens is also a zoom lens, where the maximum focal length of the first lens is less than or equal to the minimum focal length of the second zoom lens.

A compact high performance objective zoom lens system is disclosed that provides optimum optical performance over the entire zoom focal length range at focus distances from close to infinity. The system comprises, from object space to image space, one focusing objective lens group (comprising a focus lens group and a stationary lens group) and three zoom lens groups aligned on the optical axis. The focus lens group and the zoom lens groups are axially movable along the optical axis for focusing and zooming. In one embodiment, the system has a focal length zoom region from about 19 mm to 90 mm, an aperture of F / 2.7 and substantially the same optical performance as high quality fixed objective lenses of the same range. The performance characteristics of this system makes it suitable for use with both film and electronic detector cameras.

Using inhomogeneous sized liquid crystal (LC) droplets for lens and prisms. For forming a positive lens, the LC droplet size can gradually increase from the center to the side edges. For forming a negative lens, the LC droplet size can gradually decrease from the center to the side edges. The lens can be created by Ultra Violet light exposure to patterns. The lens can be tuned by applying voltage to the droplets. The inhomogeneous droplets can also be used in Fresnel lens and prisms. Applications of the invention can be used for eyeglasses, arrays, camera type zoom lenses and beam steering applications.

Using marks of known dimensions and size, and spacing, a zoom lens may be calibrated in either or both the X and Y spatial directions. A system comprising an image capture device, positioning means, position encoder means, operator interface, and processing unit permits this method to be advantageously applied to a wide variety of web inspection / control functions, including but not limited to initial web registration, multiple color ink registration, lateral web positioning, repeat length calculations, image capture synchronization, thermal / mechanical differential compensation, and accurate registration of objects within an image to other objects within an image or to a mechanical reference on a machine. Since the Zoom Calibration method permits a system to be constructed with both wide / variable field of view and accurate distance measurement positioning and calibration, all of the web inspection / control functions traditionally used in the web printing industry may be implemented with a single inspection / control system using a multitasking approach with the same inspection / control hardware. This permits rapid implementation of old and new web inspection / control functions at a greatly reduced cost as compared to traditional fixed lens systems, as well as permitting a degree of automation, remote access, diagnostic control, quality assurance, and product quality control heretofore not possible with conventional web inspection / control systems.

A zoom lens includes, in order from an object side to an image side, a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power and a fourth lens unit of positive refractive power, zooming from a wide-angle end to a telephoto end being effected by moving the second lens unit toward the image side, and shifting of an image plane due to zooming being compensated for by moving the fourth lens unit, wherein the second lens unit consists of four separate single lenses including three negative lenses and one positive lens, and the third lens unit has at least one positive lens both surfaces of which are aspherical.

A 3D triangulation scanner includes a projector, a camera, and a processor. At least one of the projector and the camera has a zoom lens and a motorized zoom adjustment mechanism. The processor is responsive to executable instructions that uses triangulation calculations to calculate 3D coordinates of points on a surface that are based at least in part on a baseline length, an orientation of the projector and the camera, a position of a corresponding source point on an illuminated pattern source of the projector, and a position of a corresponding image point on a photosensitive array of the camera. The 3D coordinates of the points are calculated at one time and at another time, at least one of the projector FOV being wider at the one time than at the another time or the camera FOV being wider at the one time than at the another time.

A zoom lens comprising, in order from an object side thereof, a first lens group of positive refracting power, a second lens group of negative refracting power, an aperture stop, a third lens group of positive refracting power, a fourth lens group of negative refracting power, and a fifth lens group of positive refracting power. Upon zooming from the wide-angle end to the telephoto end, at least the first lens group and the aperture stop remain fixed in position, the second and third lens groups move in the optical axis direction, and the separation between each of the lens groups and the aperture stop changes. Upon focusing from a focusing-on-infinity state to a close-range-focusing state, the fourth lens group moves in the optical axis direction, with satisfaction of the following:−0.36<f4 / f1<−0.05  (1A),where f1 and f4 are the focal lengths of the first and fourth lens groups, respectively.

A lens unit and a camera capable of achieving stereoscopic television function and zoom function at the same time. More specifically, a lens unit (2) and a camera (1) each including at least a zoom lens (4), light quantity adjusting device (6 or 20), an electronic optical shutter provided on a stage of the zoom lens (4), and an optical shutter driving portion for controlling the electronic optical shutter (6) to open (6A, 6B) in a predetermined pattern.

The invention provides a zoom lens system that is reduced in terms of both size and cost. The zoom lens system comprises a first positive lens group G1, a second negative lens group G2, a stop S, a third positive lens group G3 and a fourth positive lens group G4. During zooming from a wide-angle end to a telephoto end of the system, while the first lens group G1 remains fixed, the second lens group G2 moves from an object side to an image plane side of the system, the third lens group G3 moves from the image plane side to the object side, and the fourth lens group G4 moves to keep an image plane at a constant position. The first lens group G1 is made up of a negative meniscus lens convex on an object side and a double-convex lens, the second lens group G2 is made up of a double-concave lens and a positive meniscus lens convex on an object side thereof, with an aspherical surface being used for a surface of the positive meniscus lens that is located on an image side thereof, the third lens group G3 is made up of a double-convex lens and a negative meniscus lens convex on an object side thereof, with an aspherical surface being used for a surface of the double-convex lens that is located on an object side thereof, and the fourth lens group G4 is made up of one double-convex lens.

An instrument and method for optical testing of an eyeglass lens, including progressive addition lenses, to obtain image quality measurements includes an illumination system for presenting a beam of light to a test lens, a test lens positioning system for rotating the test lens so that different areas on the lens are illuminated, a zoom lens for focusing the beam at a constant effective focal length, a detection system for recording and measuring image quality of the test lens, and an alignment boom for conveying the zoom lens and the detection system such that the optical axis remains aligned with the beam existing the test lens. The instrument is fully automated and capable of obtaining measurements of the power, astigmatism, prism and modulation transfer function at various locations on the surface of the lens.

A zoom lens for forming an optical image of an object on a sensing surface of an image sensor at a variable magnification has first, second, third, fourth and fifth lens groups with positive-negative-positive-negative-positive zoom arrangement. Between the second lens group and the fourth lens group, an optical aperture stop is located. The fourth lens group is composed of one negative lens element having at least one aspherical surface and having a paraxial radius of curvature of an image side surface smaller than a paraxial radius of curvature of an object side surface, and satisfies conditional formula -1.15<f4 / √{square root over (fw.ft)}<-0.5 (where f4 represents a focal length of the fourth lens group, fw represents a focal length of an entire system at a wide-angle end, and ft represents a focal length of the entire system at a telephoto end).

Disclosed is a compact zoom lens system having a image stabilizing function. This zoom lens system is provided with a plurality of lens units of which the interval between adjacent ones is changed during zooming. Shake correction is effected by a part of a lens unit of negative optical power of the plurality of lens units. Specifically, the lens unit of negative optical power is comprised of two lens components of negative optical power, and one of these two lens components is moved so as to have a component in a direction perpendicular to an optical axis to thereby change the imaging position of the zoom lens system.

A plurality of movable lenses included in a zoom lens system are driven individually by piezoelectric actuators provided one for each lens. Two driving rods are arranged at different positions along the same line in such a way that neither of the driving rods reaches into the driving stroke of the lens driven by the other. Each driving rod has a piezoelectric actuator provided at its end farther from the other. Alternatively, a plurality of piezoelectric actuators are fixed to a single base block having a groove or a surface level difference to restrict propagation of vibration between the piezoelectric actuators. A graduated member having N-pole and S-pole regions formed alternatively thereon with a predetermined pitch is fixed, parallel to the driving rods, to the driving device itself. A magnetic resistance sensor is attached to each lens frame so as to face the graduated member. Based on the outputs of the sensors, the positions of the individual lenses are detected.

The Self-Zooming Camera uses proximity detectors and / or motion detectors in the camera to detect the position of the camera / recording device relative to the operator's eye or face. At closest viewable distance to the face (approx. 6 inches), the zoom lens operates at it's widest angle or user-specified widest angle setting. At furthest extent from the face (arm's length, approximately 2 feet), the camera zooms to its longest telephoto extent or user-specified longest zoom setting.The Self-Zooming Camera allows simple and creative zoom operation of a camera, video recorder or mobile device with camera without using buttons or zoom / focus pulling—replacing traditional controls with intuitive gesture or camera motion.

A zoom lens system comprising a plurality of lens units, wherein a lens unit located closest to an object side has positive optical power, among lens units located on the image side relative to an aperture diaphragm, a lens unit having negative optical power is at least one focusing lens unit which moves along an optical axis in focusing, an image blur compensating lens unit is provided, which moves in a direction perpendicular to the optical axis, in order to optically compensate image blur, the image blur compensating lens unit and the at least one focusing lens unit are arranged adjacent to each other, and the condition: 0.1<(T1+T2) / H<2.0 (T1 is an axial thickness of the lens unit located closest to the object side, T2 is an axial thickness of a lens unit located having one air space toward the image side from the lens unit located closest to the object side, H is an image height) is satisfied; an interchangeable lens apparatus; and a camera system are provided.