Focus error estimation in images

Simple item page
dc.contributor.assigneeBoard of Regents, The University of Texas System
dc.creatorWilson S. Geisler
dc.creatorJohannes Burge
dc.date.accessioned2019-10-23T14:02:35Z
dc.date.available2019-10-23T14:02:35Z
dc.date.filed2013-08-13
dc.date.issued2014-12-23
dc.description.abstractEstimating focus error in an image involves a training phase and an application phase. In the training phase, an optical system is represented by a point-spread function. An image sensor array is represented by one or more wavelength sensitivity functions, one or more noise functions, and one or more spatial sampling functions. The point-spread function is applied to image patches for each of multiple defocus levels within a specified range to produce training data. Each of the images for each defocus level (i.e. focus error) is sampled using the wavelength sensitivity and spatial sampling functions. Noise is added using the noise functions. The responses from the sensor array to the training data are used to generate defocus filters for estimating focus error within the specified range. The defocus filters are then applied to the image patches of the training data and joint probability distributions of filter responses to each defocus level are characterized. In the application phase, the filter responses to arbitrary image patches are obtained and combined to derive continuous, signed estimates of the focus error of each arbitrary image patch.
dc.description.departmentBoard of Regents, University of Texas System
dc.identifier.applicationnumber13965758
dc.identifier.patentnumber8917346
dc.identifier.urihttps://hdl.handle.net/2152/76442
dc.identifier.urihttp://dx.doi.org/10.26153/tsw/3531
dc.publisherUnited States Patent and Trademark Office
dc.relation.ispartofUniversity of Texas Patents
dc.relation.ispartofUniversity of Texas Patents
dc.rights.restrictionOpen
dc.rights.restrictionOpen
dc.subject.cpcG02B7/36
dc.subject.cpcH04N5/235
dc.subject.cpcH04N5/23212
dc.subject.uspc348/349
dc.subject.uspc348/345
dc.subject.uspc348/354
dc.subject.uspc382/155
dc.subject.uspc382/159
dc.subject.uspc382/160
dc.subject.uspc382/255
dc.subject.uspc382/280
dc.titleFocus error estimation in images
dc.typePatent

Access full-text files

Original bundle

Now showing 1 - 1 of 1
Thumbnail Image
Name:
US8917346.pdf
Size:
2.23 MB
Format:
Adobe Portable Document Format
Download

Collections

University of Texas Patents