The spatial resolution of captured plenoptic images is enhanced. In one aspect, the plenoptic imaging process is modeled by a pupil image function (PIF), and a PIF inversion process is applied to the captured plenoptic image to produce a better resolution estimate of the object.

There is provided a lens array and an lens array capable of suitably preventing irregular brightness without reducing resolution. A micro lens array of a screen includes upper-level microlenses and lower-level microlenses which are formed on the incidence surface of the screen, which have the same effective diameter, and which have a structure that generates an optical path length difference Δ in transmission light. By disposing the upper-level microlenses and the lower-level microlenses at an interval based on the effective diameter, the basic periodic structure of a lens period is formed. Further, the upper-level microlenses and the lower-level microlenses form a basic block comprising a combination of the lenses having a structure that generates the optical path length difference. A concave-and-convex period PC based on the basic block is an integer multiple of the lens period.

The present invention provides a diffuser plate and a method for producing a diffuser plate that can improve variations in luminance of transmitted light or reflected light in a simple structure and that enable easy design and production. The diffuser plate according to the present invention is a diffuser plate where a plurality of microlenses are placed on a principal surface, wherein a phase difference generation part is inserted between the plurality of microlenses and the principal surface, the plurality of microlenses have two or more types of lens shapes, and the number of microlenses having the two or more types of lens shapes is determined so that a quantity ratio of the two or more types of lens shapes is a specific value, each of the lens shape types is selected corresponding to each of coordinates on the principal surface in which centers of undersurfaces of the plurality of microlenses are placed, and an angle range in which the diffuse light intensity is substantially uniform is in a range of +10% to −10% of a desired angle range.

The present invention provides a diffuser plate in a simple structure capable of achieving optical properties with less luminance irregularity and color irregularity and good quality of appearance. A diffuser plate is a diffuser plate where a plurality of microlenses are placed on a principal surface, shapes of the plurality of microlenses along a cross-section perpendicular to the principal surface are different from one another and do not have an axis of symmetry. A method for designing the diffuser plate includes steps of determining a specific reference microlens; placing the reference microlens on the principal surface; forming a specific phase modulation shape; and determining a shape of the plurality of microlenses by combining the specific reference microlens and the specific phase modulation shape.

An optical assembly for illuminating at least one object appearing in a field of view (FOV). The optical assembly includes first and second illumination sources configured to provide first and second illumination to illuminate a target of the object. An aperture configured to collimate the first and second illumination and to provide the illumination to a dual collimator. The dual collimator is disposed to collimate the first and second illumination and to provide the first and second illumination to a dual microlens lens array (MLA). The dual MLA has microlens arrays configured to receive the collimated first and second radiation, to provide two illumination output fields, each output field having a different output illumination field angle.

A camera lens group sequentially includes, from an object side to an image side along an optical axis: a first lens (E1) with a refractive power, wherein an object-side surface (S1) thereof is a concave surface, while an image-side surface (S2) is a convex surface; a second lens (E2) with a refractive power, wherein an object-side surface (S3) is a convex surface, while an image-side surface (S4) is a concave surface; a third lens (E3) with a positive refractive power; a fourth lens (E4) with a refractive power; a fifth lens (E5) with a positive refractive power, wherein an object-side surface (S9) thereof is a concave surface, while an image-side surface (S10) is a convex surface; and a sixth lens (E6) with a negative refractive power, wherein an object-side surface (S11) thereof is a convex surface, while an image-side surface (S12) is a concave surface. A half lmgH of a diagonal length of an effective pixel region on an imaging surface (S15) of the camera lens group meets lmgH>4.60 mm.

An imaging device includes a multifocal main lens having different focal distances for a plurality of regions, an image sensor having a plurality of pixels configured of two-dimensionally arranged photoelectric converting elements, a multifocal lens array having a plurality of microlens groups at different focal distances disposed on an incident plane side of the image sensor, and an image obtaining device which obtains from the image sensor, a plurality of images for each of the focal distances obtained by combining the multifocal main lens and the plurality of microlens groups at different focal distances.

A spectral camera for producing a spectral output is disclosed. The spectral camera has an objective lens for producing an image, an optical duplicator, an array of filters, and a sensor array arranged to detect the filtered image copies simultaneously on different parts of the sensor array. Further, a field stop defines an outline of the image copies projected on the sensor array. The filters are integrated on the sensor array, which has a planar structure without perpendicular physical barriers for preventing cross talk between each of the adjacent optical channels. The field stop enables adjacent image copies to fit together without gaps for such barriers. The integrated filters mean there is no parasitic cavity causing crosstalk between the adjacent image copies. This means there is no longer a need for barriers between adjacent projected image copies, and thus sensor area can be better utilized.

An optical apparatus includes plural optical lens groups, an optical sensor, at least one lighting member and a casing. After a light beam passes through any of the plural optical lens groups, a travelling direction of the light beam is changed. After the light beam passes through at least one of the plural optical lens groups, the light beam is sensed and converted into an image signal by the optical sensor. The lighting member outputs a source beam. The plural optical lens groups, the optical sensor and the lighting member are accommodated within the casing. The optical apparatus has a single optical lens module, and is able to implement different optical functions simultaneously. Consequently, the overall volume of the optical apparatus is minimized, the fabricating cost of the optical apparatus is reduced, the assembling process is simplified, and the number of components to be assembled is reduced.

An optical film has a plurality of aligned convex microlenses, each of which has a region α and a region β, region β forming the outer part of the convex shape of the microlens and positioned so as to cover region α. Both region α and region β contain a resin, and the refractive index of the resin in region α is higher than the refractive index of the resin in region β; region β contains fine particles, and region α contains fine particles, and the content of the fine particles contained in region α is lower than the content of the fine particles contained in region β; or region α contains fine particles, and region β contains fine particles, and the content of the fine particles contained in region α is higher than the content of the fine particles contained in region β.