Disclosed herein is a method for testing a field of view. The method includes arranging an image acquisition apparatus at a predetermined observation position of an image output device, and arranging a grid line apparatus at a predetermined distance in front of the image acquisition apparatus. The method further includes controlling the image output device to output a test pattern; moving the grid line apparatus, and keeping the distance between the grid line apparatus and the image acquisition apparatus unchanged, such that a centerline of the grid pattern coincides with a centerline of the test pattern. Additionally, included in the method is capturing an image of the grid pattern and the test pattern by the image acquisition apparatus; and determining a field of view of the image output device according to a relationship between the test pattern and the grid pattern in the captured image.

The present disclosure relates to methods and devices for data or graphics processing including an apparatus, e.g., a GPU. The apparatus may determine a plurality of viewing positions and a plurality of viewing directions for one or more lenses. The apparatus may also measure an amount of distortion of the one or more lenses for each of the plurality of viewing positions and each of the plurality of viewing directions. Also, the apparatus may adjust pre-distortion data for each of the plurality of viewing positions and each of the plurality of viewing directions. The apparatus may also determine a pre-distortion estimation for each of the plurality of viewing positions and each of the plurality of viewing directions. The apparatus may also generate lens calibration data for all of the plurality of viewing positions and all of the plurality of viewing directions based on the pre-distortion estimation.

The present invention discloses an aspheric lens eccentricity detecting device based on wavefront technology and a detecting method thereof. The device comprises: an upper optical fiber light source, an upper collimating objective lens, an upper light source spectroscope, an upper beam-contracting front lens, an upper beam-contracting rear lens, an upper imaging detector, an upper imaging spectroscope, an upper wavefront sensor, a lens-under-detection clamping mechanism, a lower light source spectroscope, a lower beam-contracting front lens, a lower beam-contracting rear lens, a lower imaging spectroscope, a lower wavefront sensor, a lower imaging detector, a lower collimating objective lens and a lower optical fiber light source. The present invention achieves non-contact detection, with no risk of damaging the lens, and there is no moving part in the device, so the system reliability and stability are high; and in the present invention, various eccentricity errors in the effective aperture of the aspheric lens can be detected at a time, thereby avoiding errors caused by splicing detection, and also greatly reducing the detection time, thus being applicable to online detection on an assembly line.

A new diversity concept is provided for achieving accurate phase retrieval with a singleshot acquisition. Multiple irradiance data are obtained by a diffractive grating or CGH designed to generate multiple diffraction orders with different diversity values. The effective filters associated with the individual diffraction orders from the diffractive grating or CGH are calculated. The effective filters are extracted by numerical propagation, and they preferably include both real and imaginary values, which signify both absorption and phase shift versus position in the filter plane. The reconstruction process utilizes accurate knowledge of the effective filters for each diffraction order for high quality reconstruction of the extrinsic phase.

A lensmeter system may include a mobile device having a camera. The camera may capture a first image of a pattern through a lens that is separate from the camera, while the lens is in contact with a pattern. The mobile device may determine the size of the lens based on the first image and known features of the pattern. The camera may capture a second image of the pattern, while the lens is at an intermediate location between the camera and the pattern. The second image may be transformed to an ideal coordinate system, and processed determine a distortion of the pattern attributable to the lens. The mobile device may measure characteristics of the lens based on the distortion. Characteristics of the lens may include a spherical power, a cylinder power, and/or an astigmatism angle.

Disclosed herein is a method including: providing a light guiding arrangement (LGA) configured to redirect light, incident thereon in a direction perpendicular to an external surface of the sample, into or onto the sample, such that light impinges on an internal facet of the sample nominally normally thereto; generating a first incident light beam (LB), directed at the external surface normally thereto, and a second incident LB, parallel to the first incident LB and directed at the LGA; obtaining a first returned LB by reflection of the first incident LB off the external surface, and a second returned LB by redirection by the LGA of the second incident LB into or onto the sample, reflection thereof off the internal facet, and inverse redirection by the LGA; measuring an angular deviation between the returned LBs and deducing therefrom an actual inclination angle of the internal facet relative to the external surface.

A method and a device for the reduction of margins of the light image of a headline, and the headline incorporating the device, is provided, having a reflective diaphragm which is adapted to be shifted in a light axis direction within adjustment limits of a longitudinal position. The margins of the light image can be detected by an optical colour-sensitive photometric sensor, and colour characteristics of the light image margins can be evaluated by identifying a current position of the reflective diaphragm. The reflective diaphragm can then be fixed in the longitudinal position corresponding to selected colour characteristics of the light image margins. The reflective diaphragm can also be adapted to be shifted in a direction perpendicular to the light axis direction.

A method for determining at least one optimized visual equipment to be worn by a human wearer includes: obtaining a wearer model as a virtual model of the human wearer; obtaining a model of at least one environment for which the at least one optimized visual equipment is to be determined, the at least one environment comprising tridimensional positions of objects to be viewed by the wearer model; determining at least one evaluation function related to the visual equipment, as a function of at least optical performance of the visual equipment and postural performance of the wearer model in the model of the at least one environment; optimizing the at least one evaluation function, so as to determine the at least one optimized visual equipment.

A method of reducing an aberration of a lithographic apparatus, the method including measuring the aberration, taking the measured aberration into account, estimating a state of the lithographic apparatus, calculating a correction using the estimated state, and applying the correction to the lithographic apparatus.

The invention relates to a method for compensating at least one defect of an optical system which includes introducing an arrangement of local persistent modifications in at least one optical element of the optical system, which does not have pattern elements on one of its optical surfaces, so that the at least one defect is at least partially compensated.