95results about How to "Remove image distortion" patented technology

A solid-state image pickup device including a solid-state image pickup element which is curved in a light incident direction and a curvature changing portion which changes a curvature of the solid-state image pickup element, and an optical instrument including a lens unit and a solid-state image pickup element which is curved toward the lens unit and picks up taking an image focused by the lens unit wherein the curvature changing portion changes a curvature radius of the solid-state image pickup element so that the solid-state image pickup element is curved at a first curvature in a telephoto mode and the solid-state image pickup element is curved at a second curvature larger than the first curvature in a wide-angle mode.

Devices and methods for protecting components of imaging devices are provided. In the illustrative embodiment, a plano-concave protective cover is provided which is bonded to an imager window by applying a thick, quick-setting adhesive to the exterior of the cover and of the imager window.

Provided is a projection apparatus that can enhance the efficiency of utilization of RGB laser lights, eliminate positional displacement in projection point caused by spaced-apart fiber cores emitting the laser lights, and detect additional information while projecting an image with the laser lights. The projection apparatus includes a laser light source emitting infrared and RGB laser lights, a fixing device fixing end portions of an infrared-light fiber and colored-light fibers used to transmit the infrared and RGB laser lights, a scanning unit projecting an image on a projection surface by scanning the projection surface with the RGB laser lights emitted from the end portions of the colored-light fibers, a detection unit detecting reflection of the infrared laser light emitted from the end portion of the infrared-light fiber, and a control unit controlling emission of the RGB laser lights from the light source, based on information detected by the detection unit.

A laryngoscope including a handle and a spatula that is detachably connected thereto via a coupling. So that an image can be transmitted free of distortion over an image conductor from the spatula in the handle, spatula and handle are connected via first and second projections. The projections make it possible to twist the spatula in relation to the handle as well as snap-fit them to each other.

To provide an electron beam system capable of performing three-dimensional measurement of a sample with high precision irrespective of the tilt angle and height of the sample. The electron beam system has a correction factor storing section 32 for storing a correction factor at a reference tilt angle with respect to a plane which is used to tilt a sample by a sample tilting section 5, an approximate coordinate measuring section 28 for obtaining an approximate shape or approximate coordinate values of the sample based on an output corresponding to a stereo image from an electron beam detecting section 4, an image correcting section 30 for correcting the stereo image according to the tilt angle created by the sample tilting section 5 based on the shape or coordinate values of the sample obtained in the approximate coordinate measuring section 28 using a correction factor stored in the correction factor storing section 32, and a precise coordinate measuring section 34 for obtaining a shape or coordinate values of the sample which are more precise than those obtained in the approximate coordinate measuring section 28 based on a corrected stereo image obtained in the image correcting section 30.

A liquid-crystal optical element comprises a plurality of wiring electrodes formed between a plurality of segment electrodes and a lower transparent substrate and connected electrically to the segment electrodes, individually, and a plurality of contact electrodes connected to the segment electrodes and the corresponding wiring electrodes. The adjacent segment electrodes are different in height position above the lower transparent substrate. A contact electrode that is connected to that one of each two adjacent segment electrodes which is situated on the side of a liquid crystal layer is connected to the destination segment electrode inside its edge, when viewed along a section formed by cutting the segment electrode in the direction perpendicular to the planes of the lower and an upper transparent substrate.

The invention discloses a calibration method of on-orbit optical distortion parameters of a linear array push-broom camera. The method comprises the following steps: firstly, collecting and obtaining dense high precision control point information by adopting an automatch algorithm based on control points, secondly, establishing strict imaging geometric models of all the control points, thirdly, computing the theoretical steering vector and the practical steering vector of each control point, and establishing an internal orientation element geometric calibration mathematical model of the camera, fourthly, establishing a distortion polynomial model, in which the theoretical steering vectors correspond to image column numbers, and fifthly, solving an error equation through a least square method, and performing iteration solving, so as to obtain internal optical distortion calibration parameters of the camera. The method calibrates internal optical system distortion of the satellite on-orbit camera by selecting a large number of high-precision ground control points, calibration results can be used for improving the uncontrolled positioning precision and the controlled positioning precision of satellite images, after internal orientation elements of the camera are corrected through internal distortion parameters, internal distortion of the images is basically eliminated.

The invention discloses a rapid projector system parameter calibration method. The rapid projector system parameter calibration method comprises that 1) camera calibration parameters are calculated by means of a Zhengyou Zhang camera calibration method; 2) a plane equality of the plane where a calibration board is arranged in a camera coordinate space is calculated; 3) a projector projects a projection calibration feature image on the plane where the calibration board is arranged, a camera captures the projection calibration feature image, and the three-dimensional coordinate of the projection calibration feature image is calculated by means of a crossing algorithm of projection light beams and the calibration plane; 4) internal calibration parameters of the projector are calculated by means of an optimized least square method, and therefore a coordinate mapping relation among the camera imaging space, the space where the projection display surface is arranged and the projector projection image space is calculated. According to the invention, by means of the crossing principle of the projection light beams and the calibration plane, the camera calibration and the projector calibration can be calculated in unified manner, and a rapid system calibration method which has robustness is provided for the calibration calculation of internal parameters and external parameters of the projector.

The invention discloses a high resolution micro-vision system based on calculating ghost imaging and a method of obtaining images. The system successively comprises, on a light path, a laser source, a first diaphragm, a laser beam expanding lens, a collimating lens, a second diaphragm, a polarizer, a spatial light modulator, a polarization analyzer, a third diaphragm, a reflector, a beam splitter mirror, a convergent lens and a CCD camera, and also comprises a precision positioning objective table located on another light path of the beam splitter mirror and connected with a computer; the computer is also separately in connection with the spatial light modulator and the CCD camera, and obtains high resolution images through the calculating ghost imaging technology. The high resolution micro-vision system has a simple and compact structure, and employs light field intensity correlation measurement to recover object information, thereby eliminating the problem of classic optical system imaging distortion, and can obtain high accuracy and contrast images. The high resolution micro-vision system is very helpful for micro-vision system design and ghost imaging technology research.

A printer includes: a transferring device for transferring a toner image to paper; a fixing device for fixing the toner image onto the paper; a conveyance guide for guiding the paper separated from the transferring device to the fixing device, the conveyance guide being electrically insulated; and a conductive member which is grounded and protrudes from the conveyance guide so as to come in contact with the paper guided by the conveyance guide on the surface opposite to a surface bearing a transferred image.

A device for driving an endless belt of the present invention includes a drive roller and a roller pair adjoining the drive roller at a side where a photoconductive element is positioned and contacting the belt. The eccentricity of the drive roller and that of the roller pair are reduced to reduce the variation of belt speed when the drive roller is controlled at a preselected angular velocity. Even when the drum is eccentric, the device stably operates integrally with the belt without any slip or oscillation.

Arrangements for the point-to-point imaging of a broad spectrum of electromagnetic radiation and ultrasound at large angles of incidence employ matched pairs of spherically bent reflectors to eliminate astigmatic imaging errors. Matched pairs of spherically bent crystals or spherically bent multi-layers are used for X-rays and EUV radiation; and matched pairs of spherically bent mirrors that are appropriate for the type of radiation are used with microwaves, infrared and visible light, or ultrasound. The arrangements encompass the two cases, where the Bragg angle—the complement to the angle of incidence in optics—is between 45° and 90° on both crystals/mirrors or between 0° and 45° on the first crystal/mirror and between 45° and 90° on the second crystal/mirror, where the angles of convergence and divergence are equal. For x-rays and EUV radiation, also the Bragg condition is satisfied on both spherically bent crystals/multi-layers.

The invention provides a method for eliminating the distortion of an image in augmented reality integral imaging 3D display. According to the method, vertical axis distortion is eliminated by performing pitch scaling on a micro integral imaging display unit, depth distortion is eliminated by performing depth scaling on a micro integral imaging shooting unit, and after being amplified by a convex lens, the vertical axis amplification ratio and the depth amplification ratio of a reconstructed micro 3D image are the same, thus the image distortion is eliminated, meanwhile, via the reflection and transmission functions of a beam splitter prism, the amplified 3D image is overlapped with a real 3D object for displaying, and thereby the augmented reality integral imaging 3D display with high quality is achieved.

A micro-nano scale dynamic coupling vibration single-point tracking measurement method is provided. To begin with, under the condition that an AFM probe does not contact with the surface of a flat scanner, a piezoelectric scanner is driven to drive the probe to perform X-direction reciprocating scanning motion with a certain frequency and amplitude, and Z-direction deflection of the probe is recorded in real time so as to obtain a Z-direction vibration mode of the piezoelectric scanner; then, the probe is enabled to contact with the surface of the flat scanner through automatic probe entering process and scanner fine tuning, the flat scanner is controlled to be in synchronous movement with the probe in X direction and the Z-direction deflection of the probe is recorded so as to obtain a synchronous movement vibration mode of the piezoelectric scanner and the flat scanner; and at last, the recorded synchronous movement vibration mode and the vibration mode of the piezoelectric scanner are subtracted so that a Z-direction coupling vibration mode of the flat scanner at a certain position due to X-direction movement can be obtained.

The present invention relates to the technical field of lenses, and particularly relates to a film lens and a preparation process thereof. The film lens comprises a highly-transparent polyester film layer, and a highly-transparent polymer coating coated on the polyester film layer. The highly-transparent polymer coating is a curved-surface coating. The preparation process of the lens successively comprises the following steps of dedusting, removing an oxidation layer, applying the coating, curing, cutting and inspecting. The coating is coated on the film of the film lens, instead of the plastic injection production manner in the prior art. Therefore, the problems of stress marks, flow lines, bubbles and the like during plastic injection production process in the prior art can be solved. Meanwhile, the prepared film lens is high in abrasion resistance. The imaging distortion, the deformation and other defective phenomena of finished products are substantially eliminated.

The invention discloses a method for correcting a rotary large-breadth optical satellite sensor, which is used for correcting an imaging load carried by a rotary large-breadth optical satellite according to the following method: firstly, constructing a virtual circular large-area array CCD (Charge Coupled Device) according to the imaging load carried by the rotary large-breadth optical satellite;then, creating an original imaging geometric model and an equivalent virtual imaging geometric model, adopting an RFM model for free network adjustment, and space reference unification; and finally, according to the equivalent virtual imaging geometric model and the RFM model of the original imaging geometric model, carrying out virtual resampling based on object space geometric positioning consistency, and a steady-state equivalent central projection sensor correction image is obtained.

The invention discloses an optical synchronous measurement method for a combustion flow field of a scramjet engine, and the method comprises the steps: S1, giving an incoming flow condition based on ascramjet engine direct connection type test model; S2, respectively adopting a focusing schlieren technology, a laser-induced fluorescence technology and a self-luminous photograph to obtain flow field structure images of the same section at the same moment in the flow field of the scramjet engine direct connection type test model; S3, correcting the three flow field structure images obtained inthe step S2 through Matlab image processing; and S4, comparing and verifying the three flow field structure images corrected in the step S3. The method can accurately obtain the flow field characteristics in the engine combustion chamber configuration at the same time on the same cross section, improves the interactivity of information obtained by three measurement means, and improves the understanding of the flow and combustion dynamic change characteristics in the engine combustion chamber.

There is disclosed an image data correction method for correcting image data picked up from an original image photographed in an exposure frame on a photographic film through a taking lens while holding the exposure frame curved along a lengthwise direction of the exposure frame to be concave toward the taking lens, so as to eliminate image distortion in the original image. An actual location of each pixel of the original image is calculated on the basis of an ideal location that corresponds to an ideal image point of that pixel formed on a flat exposure frame through an ideal taking lens having no distortion, and correction parameters predetermined in accordance with the distortion of the taking lens and the curvature of the exposure frame at the exposure. Then, the image data are rearranging by transforming each pixel from its actual location to its ideal location in accordance with a correlation between actual locations and ideal locations of respective pixels of the original image.

A color calibrator of a display apparatus is disclosed. The color calibrator includes a color estimator for receiving a plurality of digital counts of initial colors of an image signal. The color estimator includes a first operator, a gray value electrical-optical converter, a mixed-color electrical-optical converter, an initial color electrical-optical converter, a plurality of linear transformers and a weighting operator. The gray value electrical-optical converter, the mixed-color electrical-optical converter and the initial color electrical-optical converter convert a gray value digital count, a mixed color digital count and an initial color digital count for generating a plurality conversion outputs according to a plurality of gray conversion curves, a plurality of mixed color conversion curves and a plurality of initial color converting curve. The weighting operator receives the conversion outputs and a plurality of weighting values to generate an analysis output signal.