Kyoto Institute of Technology

National University Corporation Kyoto Institute of Technology

Yasuhiro Awatsuji

Tatsuki Tahara

Peng Xia

Atsushi Kaneko

Takamasa Koyama

Ryosuke Yonesaka

Takeshi Wakamatsu

A digital holography device of an embodiment of the present invention includes: an image sensing device which records, in an image sensor and on the basis of an object, a plurality of holograms that correspond to respective different photographic exposure values; and a computer which (i) generates a high dynamic range hologram, which includes pieces of information ranging from low luminance information to high luminance information, by synthesizing the plurality of holograms recorded and (ii) generates a reconstructed image of the object by performing arithmetic processing of phase-shift interferometry, diffraction calculation, and/or the like on the basis of the high dynamic range hologram.

Digital holography device and digital holography play method

A complex amplitude information measurement apparatus () according to the present invention includes pixel sensor groups for generating a difference from one pixel sensor group to another in the optical distance of object light traveling from a measurement object (); a camera () provided with an image sensor for recording, with a single-shot exposure, the object light that has passed through or been reflected from the pixel sensor groups to obtain intensity information of the measurement object; and a computer () for computing, on the basis of the intensity information, phase information of the measurement object ().

Measurement device for obtaining amplitude information of an object

A digital holography device () which is capable of measuring a subject with high accuracy by correcting intensity unevenness by accurately removing zeroth-order diffracted light, includes: a hologram generating section () for generating a first hologram and a second hologram each obtained by extracting components identical in phase shift amount from a polarizer array hologram which is recorded in an image capturing device () mounted with a polarizer array (); a dividing section () for dividing the first hologram into a plurality of first regions, and dividing the second hologram into a plurality of second regions; a comparing section () for comparing a first average value of an intensity in a first region of the first hologram and a second average value of an intensity in a second region of the second hologram which region corresponds to the first region; and a correcting section () for, in a case where the first average value and the second average value differ, correcting at least one of the first average value and the second average value so that the first average value and the second average value are equal.

Digital holography device and image generation method using digital holography

A polarization imaging apparatus includes a laser light source and an image pickup element. Object light and reference light each include a first polarized-light component polarized in a first direction and a second polarized-light component polarized in a second direction that is different from the first direction. The image pickup element simultaneously captures an image of an interference pattern including (i) a first interference figure, (ii) a second interference figure, (iii) a third interference figure, and (iv) a fourth interference figure. The polarization imaging apparatus includes a reconstructing section generating respective reconstructed images of the object in regard to the first and second polarized-light components, from the first to fourth interference figures, and a polarized-light-image-calculating section obtaining polarized-light images from the reconstructed images.

Method and apparatus for polarization imaging

A digital holography device includes a light source that emits light, the light source being provided for supply of object light beams formed by radiation, transmission, scattering, reflection, or diffraction of the emitted light from a subject, an array device that splits the light emitted from the light source into two kinds of reference light beams having different phases in a plane perpendicular to a direction in which the light emitted from the light source travels, a CCD camera having an image-capturing plane on which two kinds of interference fringe patterns are recorded, the interference fringe patterns being formed by interferences between the two kinds of reference light beams, and the object light beams, and an image reconstruction device that generates a reconstructed image of the subject from the two kinds of interference fringe patterns recorded on the image-capturing plane.

Digital holography device and phase plate array

An embodiment of the present invention realizes an interference measurement apparatus which can obtain an interference image to be used for obtaining three-dimensional information of a subject which dynamically changes. An interference measurement apparatus of the present invention, which captures an interference image formed by the reference light beam and the object light beam which has reached the image-capturing element via a subject, the interference measurement apparatus includes: a laser light source; a beam splitter which splits a laser beam into a reference light beam and an object light beam; and an image-capturing element; a polarization splitting section which splits the object light beam into two types of object light beams which are different in polarization direction so that an angular difference is caused between respective propagation directions of the two types of object light beams; and a polarizer array device which allows (i) the reference light beam and (ii) the two types of object light beams which have reached the polarizer array device via the subject to pass through the polarizer array device (), the polarizer array device in which a plurality of first polarizer regions and a plurality of second polarizer regions are arranged, and each of the plurality of first polarizer regions and each of the plurality of second polarizer regions respectively allowing light components which are different in polarization direction. This makes it possible to obtain, by one-time image capturing, a plurality of interference patterns required for phase unwrapping.

Growing community of inventors

Kyoto, Japan

Yasuhiro Awatsuji