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    • 4. 发明申请
    • LARGE DEPTH-OF-FIELD IMAGING SYSTEM AND IRIS RECOGNITION SYSTEM
    • 大型深度成像系统和IRIS识别系统
    • WO2008122888A2
    • 2008-10-16
    • PCT/IB2008/001304
    • 2008-02-29
    • GLOBAL BIONIC OPTICS PTY LTDMATHIEU, Gilles
    • MATHIEU, Gilles
    • G02B27/00
    • G02B27/0075A61B3/14A61B5/117A61B5/1171G02B13/20G02B27/0025G06K9/00604
    • An extended depth of field (DOF) imaging system (10) is disclosed that has a corresponding extended depth of focus (DOF') by virtue of its optical system (20) having a select amount of spherical aberration. The imaging system has an image processing unit (54) 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 (60) 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 - and thus select increases in DOF - without increasing the adverse impact of other aberrations on image formation are also disclosed.
    • 公开了一种扩展景深(DOF)成像系统(10),其通过其具有选择量的球面像差的光学系统(20)具有相应的扩展深度焦点(DOF')。 成像系统具有适于处理原始图像并执行对比度增强以形成经处理的图像的图像处理单元(54)。 图像处理包括使用增益函数(G)和散焦量恢复散焦调制传递函数(MTF)。 成像系统可以包括照亮被成像物体的照明系统(60),以在光学系统和物体之间建立距离(DH),其中使用距离DH来恢复MTF。 还公开了基于增强型DOF成像系统的虹膜识别(I-R)系统。 还公开了在DOF成像系统中使用的光学系统实施例,其可以提供选择量的球面像差,并因此选择DOF的增加,而不增加其他像差对图像形成的不利影响。
    • 6. 发明申请
    • SINGLE-LENS EXTENDED DEPTH-OF-FIELD IMAGING SYSTEMS
    • 单镜头扩展景深成像系统
    • WO2009106996A2
    • 2009-09-03
    • PCT/IB2009/005383
    • 2009-02-17
    • GLOBAL BIONIC OPTICS, PTY LTDMATHIEU, Gilles
    • MATHIEU, Gilles
    • G02B27/00G02B13/20
    • G02B5/1895A61B5/117G02B13/20G02B27/0025G02B27/0075G06K9/00604
    • An extended depth of field (EDOF) imaging system (10) is disclosed that has a corresponding extended depth of focus (EDOF'). The imaging system has an optical system (20) consisting of a single lens element (22) and an objectwise aperture stop (AS) arrange substantially at a zero-coma axial position. The single lens element is configured so that the optical system has a select amount of spherical aberration (SA) in the range 0.2λ ≤SA ≤ 2λ, where λ is an imaging wavelength. The imaging system has an image sensor (30) for forming a digitized raw image (IM) of an object (OB). In applications, the raw image can be used directly. The imaging system also has an image processing unit (54) adapted to process the raw images to form contrast-enhanced images. The image processing includes forming an enhanced modulation transfer functions (MTF) using a gain function (G) applied to the "raw" MTF. Embodiments of the single lens element include at least one diffractive feature (23) to reduce chromatic aberration. Single lens elements with at least one aspheric surface (S1, S2 or S1 and S2) are also disclosed.
    • 公开了具有相应的扩展焦深(EDOF')的扩展景深(EDOF)成像系统(10)。 该成像系统具有由单个透镜元件(22)和基本上布置在零彗差轴向位置处的物体孔径光阑(AS)组成的光学系统(20)。 单透镜元件被配置为使得光学系统具有在0.2λ≤SA≤2λ范围内的选择量的球差(SA),其中λ是成像波长。 成像系统具有用于形成物体(OB)的数字化原始图像(IM)的图像传感器(30)。 在应用程序中,原始图像可以直接使用。 成像系统还具有适于处理原始图像以形成对比度增强图像的图像处理单元(54)。 图像处理包括使用应用于“原始”图像的增益函数(G)形成增强调制传递函数(MTF)。 MTF。 单透镜元件的实施例包括至少一个衍射特征(23)以减少色差。 还公开了具有至少一个非球面表面(S1,S2或S1和S2)的单透镜元件。
    • 9. 发明申请
    • THICK SINGLE-LENS EXTENDED DEPTH-OF-FIELD IMAGING SYSTEMS
    • 厚单镜像扩展深度成像系统
    • WO2011134901A1
    • 2011-11-03
    • PCT/EP2011/056463
    • 2011-04-21
    • FM ASSETTS PTY LTDMATHIEU, Gilles
    • MATHIEU, Gilles
    • G02B13/20G02B27/00G02B13/00
    • G02B27/0075G02B13/0025
    • An extended depth of field (EDOF) imaging system (10) is disclosed that has an optical system (20) consisting of a single lens element (22) 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 ≤ FC ≤ 300 microns, which is made possible by the thickness of the single lens element. The imaging system has an image sensor (30) and an image processing unit (54) adapted to process raw images to form contrast-enhanced images.
    • 公开了一种扩展景深(EDOF)成像系统(10),其具有由具有焦距(F),0.25F和1.2之间的厚度(TH)的单个透镜元件(22)组成的光学系统(20) F和目标光圈光阑(AS)。 光学系统具有允许通过定位孔径光阑来校正彗差的选择量的球面像差(SA)。 光学系统具有使得20微米= FC = 300微米的场曲率(FC)的量,其可以由单个透镜元件的厚度实现。 成像系统具有适于处理原始图像以形成对比度增强图像的图像传感器(30)和图像处理单元(54)。