13 results about "Large fov" patented technology

A deep learning-enabled system for the display or projection of high-resolution images is disclosed that is based on a jointly-trained pair of an electronic encoder network and an all-optical decoder network to synthesize / project super-resolved images using low-resolution wavefront modulators. The electronic encoder network rapidly pre-processes the high-resolution images of interest so that their spatial information is encoded into low-resolution (LR) modulation patterns, projected via a low SBP wavefront modulator. The all-optical decoder network processes this LR encoded information using thin transmissive layers that are structured using deep learning to all-optically synthesize and project super-resolved images at its output FOV. Results indicate that this diffractive image display system can achieve a super-resolution factor of ˜4, demonstrating a ˜16-fold increase in SBP. The system can be scaled to operate at visible wavelengths and be used for large FOV and high-resolution displays that are compact, low-power, and computationally efficient.

A multi-lens projection lens, a projector and an optical device are characterized in that the multi-lens projection lens comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged along an optical path; wherein the first lens is a biconvex positive lens; the second lens is a meniscus positive lens, the incident surface is a convex surface, and the emergent surface is a concave surface; the third lens is a biconcave negative lens; the fourth lens is a meniscus negative lens, the light-in surface is a concave surface, and the light-out surface is a convex surface. According to the utility model, the problems of speckle FOV, insufficient uniformity and distortion existing in the existing speckle projection scheme can be overcome, large FOV, high uniformity and low distortion speckle projection can be realized, and speckle projection with flexible pattern distribution can also be realized.

The present invention discloses an image distortion correction method for video stabilization, which relates to the technical field of image correction and includes the following steps: Step 1, calculate the mapping relationship tables in the x direction and the y direction respectively. The mapping relationship table is a corresponding relationship table between the distance between each pixel point in the pre-distortion image and the center point and the distance between each pixel point in the corrected image and the center point; Step 2, based on the mapping relationship table, map the pre-distortion image into the corrected image. A camera with a larger FOV corrects the image through the mapping relationship table based on the image distortion correction method, thereby improving the effect of video stabilization.

The present invention discloses a variable energy device, a variable energy accelerator treatment device and a control method thereof, including a KV digital detection flat panel assembly and a KV-level accelerator. The KV-level digital detection flat panel assembly includes a KV digital detection flat panel and a driving component. After adopting the technical solution of the present invention, a relatively small one can be used to move back and forth, so as to scan the signals of all fields of view once to obtain complete image information, which can greatly reduce the volume of the KV digital detection flat panel; when we adopt a KV-level accelerator system whose ray axis can be deflected, there is a straight line where the ray axis passes through the isocenter, and the angle of this straight line is set to zero. There is an angle between the straight line where the ray axis is deflected. This angle is within a positive and negative angle range. At this time, in cooperation with the back-and-forth movement of the KV digital detection flat panel, imaging with a larger FOV field of view range is obtained.

An embodiment of the present application discloses an optical imaging system, which relates to the field of optics and solves the problem of how to reduce the volume and weight of the optical imaging system while obtaining high imaging clarity under the condition of a large FoV. The optical imaging system includes: a first aberration compensation lens group, a polarizer, an optical imaging module, and a display screen. The components are arranged in sequence in the order of the display screen, the first aberration compensation lens group, the polarizer, and the optical imaging module, where: the display screen is used to emit unpolarized light; the first aberration compensation lens group is used to compensate for the aberration of the unpolarized light emitted by the display screen; the polarizer is used to transmit polarized light from the aberration-compensated unpolarized light emitted by the first aberration compensation lens group; the optical imaging module is used to fold the optical path and emit polarized light. The embodiment of the present application is used in the process of optical imaging.

A novel speckle projector and optical equipment are characterized in that the novel speckle projector comprises an array laser used for projecting array laser; a projection lens; the distance between the light-emitting surface of the array laser and the focal plane of the projection lens is smaller than 1 / 10 of the focal length of the projection lens. The problems of speckle FOV, insufficient uniformity and distortion existing in an existing speckle projection scheme can be solved, large-FOV, high-uniformity and low-distortion speckle projection is achieved, and speckle projection with flexible pattern distribution can also be achieved.

A curved lightguide that employs a freeform incoupler, a freeform world-facing surface, and a freeform outcoupler disposed between a spherical world-facing lens surface and a spherical eye-facing lens surface to achieve a relatively large FOV for display light and transmission of ambient light from the environment in a thin form factor.

A novel speckle projector and optical equipment are characterized in that the novel speckle projector comprises an array laser used for projecting array laser; a projection lens; the distance between the light-emitting surface of the array laser and the focal plane of the projection lens is smaller than 1 / 10 of the focal length of the projection lens. According to the utility model, the problems of speckle FOV, insufficient uniformity and distortion existing in the existing speckle projection scheme can be overcome, large FOV, high uniformity and low distortion speckle projection can be realized, and speckle projection with flexible pattern distribution can also be realized.

The device includes a beam source for generating an electron beam, a beam guiding tube passed through an objective lens, an objective lens for generating a magnetic field in the vicinity of the specimen to focus the particles of the particle beam on the specimen, a control electrode having a potential for providing a retarding field to the particle beam near the specimen to reduce the energy of the particle beam when the beam collides with the specimen, a deflection system including a plurality of deflection units situated along the optical axis for deflecting the particle beam to allow scanning on the specimen with large area, at least one of the deflection units located in the retarding field of the beam, the remainder of the deflection units located within the central bore of the objective lens, and a detection unit to capture secondary electron (SE) and backscattered electrons (BSE).

The charged particle beam detector may include a plurality of detector segments designed to accommodate a field of view (FOV) of the charged particle beam device. The first detector section may form a first detector region configured to capture emitted charged particles of a smaller FOV size. The second detector section may surround the first detector section to form a second detector region configured to capture emitted charged particles of a larger FOV size. The first detector region may have a lower noise component due to a smaller junction capacitance in a smaller detection surface area.

The application discloses a large-angle projection method and system of multiple MEMS galvanometer scanners, and a medium, wherein a high-speed photoelectric converter is placed between adjacent projection units; a galvanometer is driven to vibrate, and a laser is driven to emit point laser; the point laser emitted by the laser sequentially passes through a collimating lens and a linear prism, and is then incident to a surface of the galvanometer, and is reflected to a scanning object surface through the galvanometer, so that a periodic grating pattern is formed; the time delay of the driving signals of multiple lasers is adjusted, and the high-speed photoelectric converter is combined, so that the projection boundaries of two adjacent galvanometers are aligned; the time delay of the driving signals of the multiple lasers is adjusted, so that the phases projected by the multiple projection units are continuously coded; a camera is triggered to acquire the grating pattern; and three-dimensional information of the scanning object is generated based on the grating pattern; the application has the advantage of a larger FOV than a single MEMS galvanometer projection scheme, a projection scheme with a large depth of field and a large projection angle is obtained, and a low-cost scheme can be provided for a large-view-field three-dimensional scanning.

A detection apparatus, a LiDAR and a terminal, which are applied to the technical field of LiDARs. The detection apparatus comprises a transmitting module, a first receiving module, a second receiving module and a scanning module, wherein the transmitting module is used for transmitting a light beam to an object space, the first receiving module and the second receiving module are each used for receiving the light beam from the object space, and the field of view (FOV) of the first receiving module is different from that of the second receiving module. Moreover, a transmitting light path of the transmitting module, a receiving light path of the first receiving module and a receiving light path of the second receiving module all pass through the same reflecting surface of the scanning module. Therefore, the matching degree of light spots received by a plurality of receiving modules can be improved, and energy distribution differences caused by different reflecting surfaces can be significantly reduced, such that a large FOV and a high resolution are ensured, and the performance of the detection apparatus can also be improved and remain stable.

Objective lens configurations are described that can be used to implement dual-view microscopes with two fields of view (FOVs). An example dual-view microscope objective includes a rear lens group, a front lens group, and a waveguide positioned between the rear and front lens groups. The waveguide includes a reflective region that receives light from the front lens group and partially reflects the light in a lateral direction away from the rear lens group while allowing a portion of the received light to be transmitted through the waveguide toward the rear lens group. The front and rear lens groups allow viewing or imaging of a sample in a first viewing or imaging mode having a first FOV. The front lens group and the reflective region of the waveguide allow viewing or imaging of the sample in a second viewing or imaging mode having a larger FOV compared to the first FOV.