271 results about "Long-focus lens" patented technology

The present invention discloses a control method of an electronic device. First, a wide-angle lens is started, then, a display is controlled to display a cached wide-angle image as a preview image, next, when the preview image is zoomed in or out, a designated area is identified and the long-focus lens is started. Further, an actuator is controlled so as to enable a cached long-focus image to be in the designated area, and the wide-angle lens and the long-focus lens are controlled to image. Finally, a wide-angle image and a long-focus image are combined. The present invention further discloses a control device and an electronic device. According to the control method, the control device and the electronic device, when a user zooms in or out, the actuator is used to control the wide-angle lens and the long-focus lens to move relatively, so that the relative position of the overlapping part in the field of view of the wide-angle lens is changed, and the overlapping parts are combined so as to make a corresponding part clearer, therefore, when the user zooms in or out the designated area of cached wide-angle image, the long-focus lens can image the designated area so as to make the designated area clearer, and the user experience is improved.

The invention relates to a device and a method for measuring lens focal length as well as a method for evaluating optical quality, wherein the device for measuring the lens focal length is composed of a plane mirror, a lens to be measured, a point light source, a vertical incision, a one-dimensional precise flat movable guide rail, a laser distance measuring instrument, a CCD detector and a display, and the method for measuring the lens focal length is as follows: (1) adjusting the autocollimation of the point light source and the lens to be measured; (2) adjusting the plane mirror to make the transflective convergent beam enter the CCD detector; (3) measuring the focal depth of the lens to be measured; (4) measuring the distance L from the point light source to the geometric main plane of the lens to be measured; (5) calculating the focal length f = L + d of the lens to be measured, and the d is the distance between the geometric main plane of the lens and the optical main plane. The optical processing quality of the lens to be measured is qualitatively evaluated through the observation of shape of the far-field focal spot. The device and the method are applied to the measurement and evaluation of the small-bore short-focus and large-bore long-focus lens, and have the advantages of the intuitionism, the high measuring precision and the simple mechanism.

A multifocal lens system to be used for digital cameras for setting any one of a plurality of lenses in a picture taking (image capturing) position comprising a wide-angle lens (shorter focal length lens) mounted in front of an image sensor in a picture taking (image capturing) position, a telephoto lens (longer focal length lens) mounted alongside the wide-angle lens, a parallelogram prism (rhombic prism) or a pair of triangular prisms removably arranged between the two lenses at the rear of them. When the wide-angle lens is to be used, the parallelogram prism or one of the two triangular prisms is to be removed from the rear of wide-angle lens so that the wide-angle lens can be focused on the sensor enabling light to pass therethrough. The telephoto lens is so positioned that it may be focused on the image sensor through the parallelogram prism or being reflected by the triangular prisms enabling light to pass therethrough when a part of the parallelogram prism or one of the two triangular prisms is placed in front of the image sensor to cover the imaging area of the sensor and to shut the light through the wide-angle lens to the sensor. By moving the prism from the rear of each lens, one of the two lenses can be positioned for picture taking (image capturing).

The invention discloses a laser combined machining and profile modification method of a micro deep borehole without a recast layer. The method of the invention includes the following steps: first, a micro deep cooling borehole of a turbine blade is roughly machined by high power laser or electric sparks, and the like; the allowance for finish of the aperture is more than the thickness of the recast layer produced by using the machining method; and femtosecond laser is used for the secondary finish machining and profile modification of the micro deep cooling borehole; while femtosecond impulse laser is used for performing the finish machining and profile modification of the primarily machined micro deep borehole, under the precondition of guaranteeing the laser energy acting with the recast layer of a workpiece is higher than the ablation threshold of the material, a light beam is inclined for certain angle according to the spiral drilling mode; and the recast layer of the internal wall of the borehole is machined to remove erosion and profile modification by combining the method of lengthening the focal depth by a long focus lens. The concept of the combined machining method and the specific machining technology are used for solving the high-efficiency and high-precision machining problems of micro deep borehole groups of turbine blades.

The invention relates to an automatically focused remote iris image acquisition device, an automatically focused remote iris image acquisition method and a recognition system. The device comprises an iris camera, a long-focus lens, a focusing drive unit, a lens converter, a focusing rotating machine, a motor drive unit and a computational processing unit; and the automatic focusing method based on the device comprises the following steps of: initializing focusing equipment; continuously acquiring iris images by the camera; computing the definition and definition change of the acquired images by the computational processing unit; determining the focusing speed and direction according to the current state and state transition condition of the system; and detecting clear eye images from the image sequence for iris recognition. Based on the focusing device and the focusing method, the range of depth of field and speed of acquiring remote iris images can be increased greatly. Furthermore, the remote iris image recognition system using the method and the device is more convenient and easy to use.

A telephoto lens unit (1) having a lens barrel that supports a telephoto lens and capable of being mounted on and dismounted from a camera body (16) comprises a front lens barrel section (11) that supports the telephoto lens with the subject side defined as the front, and a rear lens barrel section (13) that can be mounted on and dismounted from the front lens barrel section. The distance from the image-most surface of the telephoto lens to the image formation plane of the telephoto lens is kept sufficiently long. Converter lens units (12, 14) for elongating or shortening the focal distance are mounted on the front lens barrel section (11) instead of the rear lens barrel section (13) to provide interchangeable telephoto lenses for a camera having different focal lengths. Also, an erecting prism unit (15) and an eyepiece unit (17) can be connected instead of the rear lens barrel section to enable the telephoto lens to function as a terrestrial telescope.

Provided is a bridge dynamic deflection facula imaging measuring device and a method. A blue light-emitting diode (LED) lamp is arranged at the position of a deflection measure point of a structure to be measured, light is processed by a charge coupled device (CCD) in a photoelectrical coupling mode after passing through a filtering and central-long focus lens, optical signals of the deflection measure point of the structure to be measured are converted into picture signals to be transmitted to a computer which works out a location value of a facula corresponding to the LED lamp on a receiving screen, then the position value of the deflection measure point of the structure to be measured is calculated, and bridge dynamic deflection measurement in a bridge measurement and health monitoring process is achieved.

Provided is a telephoto lens system. The telephoto lens system includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power, which are arranged sequentially from an object side to an image side. Focusing is performed by moving the second lens group along an optical axis. The first lens group comprises (from object to image side) a positive lens having an object side surface whose radius of curvature is greater than that of an image side surface, a positive meniscus lens having a convex surface at the object side, a negative meniscus lens having a convex surface at the object side, and a positive lens having an object side surface whose radius of curvature is greater than that of an image side surface. The second lens group comprises (from object to image side) a doublet lens made up of a positive lens and a negative lens, and the third lens group comprises a doublet lens made up of a negative lens with a concave surface at the object side and a positive lens, and a positive lens.

A telephoto lens system includes a positive first lens group, a positive second lens group, a diaphragm, a negative third lens group constituting a focusing lens group, and a positive fourth lens group.

The first lens group includes a positive first lens element, a positive second lens element, and a negative third lens element. The second lens group includes a negative or a positive fourth lens element and a positive or negative fifth lens element which are cemented to each other. The third lens group includes a positive or negative sixth lens element and a negative or positive seventh lens element which are cemented to each other. The fourth lens group includes one positive eighth lens element. Upon focusing on an object at infinity to an object at a closer distance, the third lens group is moved toward the image. The telephoto lens system satisfies the following conditions:

1.4<f/f1<1.8   (1)

2.4<f/f12<3.0   (2)

−5.5<f/f3<−3.5   (3)

• • wherein f: a focal length of the telephoto lens system; f1: the focal length of the first lens group; f12: the combined focal length of the first lens group and the second lens groups; and f3: a focal length of the third lens group.

An image capturing apparatus and an image smooth zooming method thereof are provided. The image capturing apparatus includes a wide-angle lens and a telephoto lens having different sizes of field of view (FOV). In the method, a wide-view image and a tele-view image are respectively captured by using the wide-angle lens and the telephoto lens according to a zoom scale in a capturing setting. Ratios of the FOV sizes of the wide-angle lens and the telephoto lens to the zoom scale are respectively calculated and used to zoom the captured wide-view image and tele-view image so as to fit the zoom scale. The zoomed wide-view image and tele-view image are aligned according to a shift between view centers of the wide-angle lens and the telephoto lens. Finally, the zoomed and aligned wide-view image and tele-view image are overlapped to output an overlapped image fitting the zoom scale.

The invention discloses a high-precision focus detection device for a long-focus lens, which comprises a laser, a microscope objective, a pin hole, a first Ronchi grating, the long-focus lens to be detected, a second Ronchi grating, ground glass and a CCD (Charge Coupled Device) camera. Light emitted by the laser passes through the microscope objective and the pin hole to form a divergent beam and the divergent beam enters the first Ronchi grating and then passes through the long-focus lens to be detected and the second Ronchi grating; the second Ronchi grating is placed at a certain talbot-order position of the first Ronchi grating, so that Moire fringes can be formed on a talbot image of the first Ronchi grating and the second Ronchi grating; and the fringes are acquired by the CCD camera and the focus of the lens to be detected can be obtained by calculating angles of the fringes. The high-precision focus detection device has a simple structure, is easy to implement, has high precision, can be used for detecting the long-focus lens and accurately measuring the focus in an optical system and particularly can be used for accurately measuring the focus of the large-caliber long-focus lens (the focus is in the range of meters and dozens of meters), so that an error caused by the scanning detection is avoided.

The invention discloses a distant range iris identifying system and a method thereof. The system includes: a camera/long focus lens for shooting eye image; a collecting card; a main control computer for collecting image by controlling the camera/long focus lens through the collecting card; a controllable clouds terrace for controlling the camera/long focus lens raising falling or left and righ rotary set on computer under controlled by the computer; a display/clew device for displaying the image collected by the camera/long focus lens or clewing under controlled by the main control computer; a height test sensor set on an identifying channel top for testing human height; an infrared source set on two sides of the channel door front for supplying light to image shoot; a singlechip control circuit for controlling the height testing sensor and the infrared source working. The system can shoot clear iris image continuously in distant range (beyond three meters) and identify which can increase practicability and enlarge application range for identifying iris.

The invention relates to the field of camera shooting equipment, in particular to a dual-lens camera shooting machine. According to the technical scheme, the dual-lens camera shooting machine comprises a wide-angle lens, the wide-angle lens is fixedly connected to a first bearing part, and dual-lens camera shooting machine is further provided with a telephoto lens which is connected to the first bearing part through a second bearing part, and both the first bearing part and the second bearing part can rotate in the vertical direction and the horizontal direction. The technical purpose is to provide the dual-lens dome-shaped camera shooting machine, both the wide-angle lens and the telephoto lens can rotate on a cloud deck, the range of a monitored picture is further enlarged, zooming tracking of a monitored object is also guaranteed, and the wide-angle lens and the telephoto lens are independent and do not interfere with each other.

A dual field-of-view optical imaging system is provided for obtaining two images of a scene, each image having a different field of view. The dual field-of-view optical imaging system includes a frontal dual focus lens, the dual focus lens having a central zone of focal length f₁ producing a wide field-of-view image at a first focal plane and a peripheral zone of focal length f₂ greater than f₁ producing a narrow field-of-view image at a second focal plane; and a detector for detecting and acquiring the wide field-of-view image and the narrow field-of-view image, the detector being movable along an optical path for selective positioning at the first focal plane or the second focal plane.

The embodiment of the invention discloses a dual-camera shooting method and apparatus, a storage medium and a terminal. The method comprises the following steps: firstly determining a shooting main body in a preview image; secondly, tracking the shooting main body by using a telephoto lens to obtain first displacement information of the shooting main body; then, performing motion compensation on the telephoto lens according to the first displacement information; and finally, when a shooting instruction is triggered, obtaining a long-focus image according to the telephoto lens subjected to themotion compensation, and obtaining a wide-angle image according to the wide-angle lens; and generating a target image according to the long-focus image and the wide-angle image. The motion compensation can be performed on the telephoto lens, the target image is generated according to the wide-angle image obtained by the wide-angle lens and the obtained by the motion compensation, therefore dual-camera motion compensation is achieved, and the shooting image quality is improved.

The purpose is to provide a large-aperture-ratio internal focusing telephoto lens applicable to a wider photographing area by equipping a vibration reduction function capable to satisfactorily correct a camera shake and the like with securing superb optical performance. The large-aperture-ratio internal focusing telephoto lens includes, in order from an object, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power. The second lens group G2 is moved along an optical axis upon changing focus from infinity to a close-range object. The first lens group G1 has at least two cemented lenses and satisfies a given conditional expression. Either one of the cemented lens satisfies a given conditional expression.

A fixed-focus lens disposed between a magnified side and a minified side. The fixed-focus lens has an optical axis and includes a reflective system and a refractive system. The reflective system includes a reflection mirror with a negative refractive power. The refractive system is disposed between the reflection mirror and the minified side and includes a first lens group and a second lens group. The first lens group has a positive refractive power. The second lens group is disposed between the first lens group and the minified side, and has a positive refractive power. The fixed-focus lens satisfies F/H>0.23, where F is an effective focal length and H is an image height.

A variable-focus lens system that is small in size and permits attainment of high zooming ratio while maintaining high performance. In order from the object side, there are therein a first, positive lens group; a second, negative lens group; a third, positive lens group; a fourth, positive lens group; and a fifth, negative lens group; all of the lens groups move toward the object side in such fashion as to cause the distance between the first and second lens groups to increase, the distance between the second and third lens groups to decrease, the distance between the third and fourth lens groups to increase, and the distance between the fourth and the fifth lens groups to decrease, when the positional state of the lens changes from the extreme wide-angle state to the extreme telephoto state. At this time, the second lens group and the fourth lens group move in integral fashion during a change in the positional state of the lens, an aperture stop is arranged between the second and third lens groups, and the aforesaid third lens group moves during short-distance focusing. Suitable ranges for the widths of the second through fourth lens groups are defined by means of conditional expressions.

A multi-inclination angle full-length shot stabilizer of the present invention comprises a hand-held part, a fixing rack, a steering device and a control device, the steering device comprises a heading motor, a roll motor, a pitching motor, a first connecting rod and a second connecting rod, and the control device is connected with the heading motor, the roll motor and the pitching motor separately and electrically. One end of the first connecting rod is connected with a rotating shaft of the heading motor, and the other end is equipped with a first cavity. The roll motor is installed in the first cavity, the other end of the second connecting rod is equipped with a second cavity in which the pitching motor is installed, and the fixing rack is connected with a rotating shaft of the pitching motor. The axis of the rotating shaft of the heading motor is vertical with the axis of the rotating shaft of the pitching motor, and an included angle a of the axis of the rotating shaft of the pitching motor and the axis of the rotating shaft of the roll motor is greater than 10 degrees and less than 90 degrees. The stabilizer of the present invention has the advantages of being small in size, not shielding a real-time view finding display screen of a photographic device and being able to support a tele lens camera.

A telephoto lens system including a first lens group having a positive refractive power and including at least three positive lenses and one negative lens; a second lens group having a negative refractive power and for performing focusing by moving along an optical axis; and a third lens group having a positive refractive power and including a 3a sub-lens group with positive refractive power and a 3b sub-lens group), wherein the 3a sub-lens group includes a negative lens and a positive lens sequentially arranged from an object side d, the 3b sub-lens group includes a positive lens and a negative lens sequentially arranged from the object side, and the telephoto lens system satisfies a condition, 0.17<fb/f<0.35, where, fb indicates a back focal length in air without a filter, that is, a distance from a lens surface of the telephoto lens system closest to the image side to an imaging surface with respect to the telephoto lens system having an optical arrangement at an infinite object position in air without the filter, and f indicates an overall focal length of the telephoto lens system.

A telephoto lens system includes a first lens group having a positive refractive power, and comprising at least three positive lenses and one negative lens; a second lens group having a negative refractive power, and which moves along an optical axis to perform a focusing operation; a third lens group having a positive refractive power, and comprising a cemented lens in which a positive lens having a convex surface toward the object side and a positive lens having a convex surface toward the image side are bonded to each other, a bi-convex positive lens, and a negative lens having a concave surface toward the object side, and the first through third lens groups are disposed sequentially from the object side to the image side.

The invention discloses a telephoto camera calibration method based on a polynomial projection model. Orthogonal projection models are mostly used in existing methods, focal length parameter limit is high, and an application range is narrow. The novel projection model is used for describing a projection process of a telephoto camera, points on an image are converted onto a spherical surface, and internal reference optimization is realized according to projection properties of straight lines on the spherical surface. External reference is solved by the aid of a projection relation among the points on the spherical surface and points on a calibration plate, and finally the internal reference and the external reference are optimized in a combined manner. The telephoto camera calibration method is generally applicable to telephoto lenses with different focal lengths, and has the advantages of high antijamming property, simple experimental facilities and high precision and flexibility.

The invention relates to a long-wave infrared two-speed viewing field tracking measurement lens comprising a main lens cone. The long-wave infrared two-speed viewing field tracking and measuring lens is characterized in that the main lens cone is internally provided with a just crescent fixed lens A, a switching lens group B and a just crescent focusing lens C along an incident direction of infrared light from left to right, wherein the just crescent focusing lens C is driven by a focusing mechanism arranged in the main lens cone; the switching lens group B is divided into a long-focus lens group B (long) used during a long lens focus and a short-focus lens group B (short) used during a short lens focus, and the long-focus lens group B (long) or the short-focus lens group B (short) is driven by a switching rotation mechanism arranged in the main lens cone to be on a same light path with the just crescent fixed lens A and the just crescent focusing lens C. The invention has long designed focus of the lens, can conveniently switch the two-speed viewing field lens and enable a thermal imaging system to carry out tracking measurement on a long-distance target, can not only carry out large-area low-magnification approximate observation on the long-distance target, but also carry out small-area high-magnification detailed observation on the long-distance target.