Fm-assets, Pty Ltd

Other

Mauna Kea Technologies

Essilor International

Schlumberger Canada Limited

Global Bionic Optics Pty Ltd.

Gilles Mathieu

Jean-Paul Cano

Christian Bovet

Jerome Ballet

Nicolas Boularot

Bertrand Viellerobe

Magalie Genet

Nicolas Lavillonniere

François Doussoux

Peter Wraight

Kent Lang

Roland Banas

Jim A Grau

Ned Clayton

(A) An extended depth of field (DOF) imaging system () is disclosed that has a corresponding extended depth of focus (DOF') by virtue of its optical system () having a select amount of spherical aberration. The imaging system has an image processing unit () adapted to process the raw images and perform contrast enhancement to form processed images. The image processing includes restoring the defocused modulation transfer functions (MTFs) using a gain function (G) and the amount of defocus. The imaging system can include an illumination system () that illuminates the object being imaged to establish a distance (DH) between the optical system and the object, where distance DH is used in the restoring of the MTF. An iris-recognition (I-R) system based on the enhanced DOF imaging system is also disclosed.; Optical system embodiments for use in the DOF imaging system that can provide select amounts of spherical aberration&#x2014;and thus select increases in DOF&#x2014;without increasing the adverse impact of other aberrations on image formation are also disclosed.

Large depth-of-field imaging system and iris recogniton system

An extended depth of field (EDOF) imaging system () is disclosed that has an optical system () consisting of a single lens element () having a focal length (F), a thickness (TH) between 0.25F and 1.2F, and an objectwise aperture stop (AS). The optical system has a select amount of spherical aberration (SA) that allows for correcting coma by positioning the aperture stop. The optical system has an amount of field curvature (FC) such that 20 microns&#x2266;FC&#x2266;300 microns, which is made possible by the thickness of the single lens element. The imaging system has an image sensor () and an image processing unit () adapted to process raw images to form contrast-enhanced images.

Thick single-lens extended depth-of-field imaging systems

A miniaturized optical head provided to equip the distal end of a beam of flexible optical fibers scanned by a laser beam, is designed to come in contact with a sample and to excite the sample confocally. This optical head includes elements for correcting spherical aberrations and focusing members. The focusing members include: at least a first lens (L) of high convergence associated with a spherical or hemispherical lens (L) arranged at the distal end of the optical head, and elements for correcting the axial and lateral chromatic aberration provided with a single divergent lens () whose curvature is substantially centered on the pupil of the optical fiber beam and arranged at the exact distance for this pupil for which the conditions of lateral achromatization coincide with the conditions of axial achromatization; this divergent lens being associated with a second convergent lens (L) in the form of a doublet (L).

Miniaturized optical head with high spatial resolution and high sensitivity, especially for fibred confocal fluorescence imaging

An extended depth-of-field (EDOF) surveillance imaging system () that has a lens system () with a total lens power &#x3c6;and an amount of spherical aberration SA where 0.2&#x3bb;&#x2266;SA&#x2266;2&#x3bb;. The lens system includes first lens group (G) and a second lens group (G). The first lens group has first and second confronting meniscus lens elements (L, L) that have an overall optical power &#x3c6;such that |&#x3c6;1/&#x3c6;|&#x2266;0.05. The second lens group has a doublet (D) and a most imagewise positive lens element (L). An aperture stop (AS) is arranged either between the first and second lens groups or within the second lens group. An image sensor () is arranged to receive the image and form therefrom a digitized electronic raw image. An image processor receives and digitally filters the digitized electronic raw image to form a digitized contrast-enhanced image.

Extended depth-of-field surveillance imaging system

Growing community of inventors

Lunel, France

Gilles Mathieu