Invention Grant
- Patent Title: Extended depth of field using a multi-focal length lens with a controlled range of spherical aberration and a centrally obscured aperture
- Patent Title (中): 使用具有可控球面像差范围的多焦距透镜和中央遮蔽孔径来扩展景深
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Application No.: US11870729Application Date: 2007-10-11
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Publication No.: US08086058B2Publication Date: 2011-12-27
- Inventor: Nicholas George , Wanli Chi
- Applicant: Nicholas George , Wanli Chi
- Applicant Address: KY Grand Cayman
- Assignee: Aptina Imaging Corporation
- Current Assignee: Aptina Imaging Corporation
- Current Assignee Address: KY Grand Cayman
- Agency: Kramer Levin Naftalis & Frankel LLP
- Main IPC: G06K9/40
- IPC: G06K9/40 ; G02B3/02 ; G02B3/00 ; G02B13/00

Abstract:
An extended depth of field is achieved by a computational imaging system that combines a multifocal imaging subsystem for producing a purposefully blurred intermediate image with a digital processing subsystem for producing a recovered image having an extended depth of field. The multifocal imaging system preferably exhibits spherical aberration as the dominant feature of the purposeful blur. A central obscuration of the multifocal imaging subsystem renders point-spread functions of object points more uniform over a range of object distances. An iterative digital deconvolution algorithm for converting the intermediate image into the recovered image contains a metric parameter that speeds convergence, avoids stagnations, and enhances image quality.
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