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4D frequency analysis of computational cameras for depth of field extension
2009
ACM Transactions on Graphics
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We analyze defocus kernels in the 4D light field space and show that in the frequency domain, only a low-dimensional 3D manifold contributes to focus. ...
We have built a prototype lattice-focal lens and present extended depth of field results. ...
The Fourier optics OTF of a wavefront coding lens can be computed as well, and we refer the reader to [Zhang and Levoy 2009; Dowski and Cathey 1995] for derivation. ...
doi:10.1145/1531326.1531403
fatcat:6g2xemm4rndhdar3xvilmtsk5q
4D frequency analysis of computational cameras for depth of field extension
2009
ACM SIGGRAPH 2009 papers on - SIGGRAPH '09
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We analyze defocus kernels in the 4D light field space and show that in the frequency domain, only a low-dimensional 3D manifold contributes to focus. ...
We have built a prototype lattice-focal lens and present extended depth of field results. ...
The Fourier optics OTF of a wavefront coding lens can be computed as well, and we refer the reader to [Zhang and Levoy 2009; Dowski and Cathey 1995] for derivation. ...
doi:10.1145/1576246.1531403
fatcat:hs3w6hsq5jgctfiqodn7snciui
Light field image denoising using a linear 4D frequency-hyperfan all-in-focus filter
2013
Computational Imaging XI
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We show that the light field of a Lambertian scene has a 4D hyperfan-shaped frequency-domain region of support at the intersection of a dual-fan and a hypercone. ...
Computational photography offers a promising solution in the form of the light field camera, which by capturing redundant information offers an opportunity for elegant noise rejection. ...
Acknowledgment This work is supported in part by the Australian Centre for Field Robotics, the New South Wales State Government, The University of Sydney, and the Australian Government's International ...
doi:10.1117/12.2002239
dblp:conf/cimaging/DansereauBPW13
fatcat:vucjaf7lq5h3de2yifvuudbd7i
Light Field Blind Motion Deblurring
2017
2017 IEEE Conference on Computer Vision and Pattern Recognition (CVPR)
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By analyzing the motion-blurred light field in the primal and Fourier domains, we develop intuition into the effects of camera motion on the light field, show the advantages of capturing a 4D light field ...
instead of a conventional 2D image for motion deblurring, and derive simple methods of motion deblurring in certain cases. ...
Previous work has demonstrated the benefits of lifting problems in computer vision, computer graphics, and computational photography into the 4D light field space. ...
doi:10.1109/cvpr.2017.253
dblp:conf/cvpr/SrinivasanNR17
fatcat:gcw3qplfpjeg5ftmhkozy7ggzq
Dappled photography
2007
ACM SIGGRAPH 2007 papers on - SIGGRAPH '07
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This partial encoding of 4D ray-space data enables editing of image contents by depth, yet does not require computational recovery of the complete 4D light field. ...
Abstract We describe a theoretical framework for reversibly modulating 4D light fields using an attenuating mask in the optical path of a lens based camera. ...
Acknowledgements We thank the anonymous reviewers and several members of MERL for their suggestions. ...
doi:10.1145/1275808.1276463
fatcat:xdqjsg55kzdmlalpk44ph5kofu
Light Field Blind Motion Deblurring
[article]
2017
arXiv
pre-print
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By analyzing the motion-blurred light field in the primal and Fourier domains, we develop intuition into the effects of camera motion on the light field, show the advantages of capturing a 4D light field ...
instead of a conventional 2D image for motion deblurring, and derive simple methods of motion deblurring in certain cases. ...
Previous work has demonstrated the benefits of lifting problems in computer vision, computer graphics, and computational photography into the 4D light field space. ...
arXiv:1704.05416v1
fatcat:cwx2ivx6rfha7cdqubfrryqf7e
Computational Photography
[article]
2006
Eurographics State of the Art Reports
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Unbounded dynamic range, variable focus, resolution, and depth of field, hints about shape, reflectance, and lighting, and new interactive forms of photos that are partly snapshots and partly videos are ...
Computational photography combines plentiful computing, digital sensors, modern optics, actuators, probes and smart lights to escape the limitations of traditional film cameras and enables novel imaging ...
The theory enables one to compute photographs focused at different depths more quickly from the 4D light field data. ...
doi:10.2312/egst.20061051
fatcat:6ig2c522qve3bejhvvb4jemipu
Light Field Image Processing: An Overview
2017
IEEE Journal on Selected Topics in Signal Processing
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for light field display, and computer vision applications of light field data. ...
On the one hand, this higher-dimensional representation of visual data offers powerful capabilities for scene understanding, and substantially improves the performance of traditional computer vision problems ...
[66] provided code for light field analysis in terms of both depth estimation and light field super-resolution. Tao et al. ...
doi:10.1109/jstsp.2017.2747126
fatcat:rvsfzvdxbbf4zesqdkaj3cseza
Depth from Combining Defocus and Correspondence Using Light-Field Cameras
2013
2013 IEEE International Conference on Computer Vision
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We then show how to combine the two cues into a high quality depth map, suitable for computer vision applications such as matting, full control of depth-of-field, and surface reconstruction. ...
Light-field cameras have recently become available to the consumer market. ...
We are grateful for the support from Nokia, Samsung, and Adobe. ...
doi:10.1109/iccv.2013.89
dblp:conf/iccv/TaoHMR13
fatcat:ptag5qxxkvgldmeaoi7iyo4whu
Computational Photography
[article]
2007
Eurographics State of the Art Reports
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Unbounded dynamic range, variable focus, resolution, and depth of field, hints about shape, reflectance, and lighting, and new interactive forms of photos that are partly snapshots and partly videos are ...
Computational photography combines plentiful computing, digital sensors, modern optics, actuators, probes and smart lights to escape the limitations of traditional film cameras and enables novel imaging ...
Pick the rays you need for ANY camera outside. --2D surface of cameras, 2D surface of cameras, + + 2D 2D ray set for each camera, ray set for each camera, 4D set of rays. 4D set of rays. 4-D Illumination ...
doi:10.2312/egt.20071066
fatcat:btr4b2hrszegnhrukfnwe7i7oe
An analysis of color demosaicing in plenoptic cameras
2012
2012 IEEE Conference on Computer Vision and Pattern Recognition
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A plenoptic camera captures the 4D radiance about a scene. Recent practical solutions mount a microlens array on top of a commodity SLR to directly acquire these rays. ...
In this paper, we develop a simple but effective technique for improving the image resolution of the plenoptic camera by maneuvering the demosaicing process. ...
Extended Depth of Field Another popular application of our method is the extended depth of field photography. ...
doi:10.1109/cvpr.2012.6247764
dblp:conf/cvpr/YuYLG12
fatcat:y4bmoqtgx5acrihs6r63lkcu2u
Shield fields
2008
ACM Transactions on Graphics
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We first describe the properties of shield fields in the frequency-domain and briefly analyze the "forward" problem of efficiently computing cast shadows. ...
(Left) The shield field camera, containing: an array of point lights, an object for reconstruction, and a large-format, mask-based light field camera. ...
Acknowledgements We thank the anonymous reviewers for their useful suggestions, John Barnwell for assisting in the construction of the prototype system, Takafumi Aoki for preparing the video, and Jay Thornton ...
doi:10.1145/1409060.1409084
fatcat:gqabgte2ynh73pdywnfo5t6wpm
Shield fields
2008
ACM SIGGRAPH Asia 2008 papers on - SIGGRAPH Asia '08
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We first describe the properties of shield fields in the frequency-domain and briefly analyze the "forward" problem of efficiently computing cast shadows. ...
(Left) The shield field camera, containing: an array of point lights, an object for reconstruction, and a large-format, mask-based light field camera. ...
Acknowledgements We thank the anonymous reviewers for their useful suggestions, John Barnwell for assisting in the construction of the prototype system, Takafumi Aoki for preparing the video, and Jay Thornton ...
doi:10.1145/1457515.1409084
fatcat:772fghym4bfcbinr3iet5lunae
An overview of computational photography
2012
Science China Information Sciences
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, e.g. depth of field, dynamic range; and (iii) the sampling subspaces of visual scenes in the real world. ...
As a loose description, computational photography accounts for studies for the extension of film-like photography and digital photography, which both capture only a 2D projection of visual scenes. ...
[6, 72] , who designed mask enhanced cameras to heterodyne the band-limited light fields in the frequency domain for refocusing; Ng [32] , who analyzed the 4D light field captured by a lenslet based ...
doi:10.1007/s11432-012-4587-6
fatcat:pfndsz4n6bgbbotzx5m2sq4hvm
Variable Aperture Light Field Photography: Overcoming the Diffraction-Limited Spatio-Angular Resolution Tradeoff
2016
2016 IEEE Conference on Computer Vision and Pattern Recognition (CVPR)
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In this paper, we analyze fundamental resolution limits of light field cameras in the diffraction limit. ...
With this work, we hope to advance our understanding of the resolution limits of light field photography and develop practical computational imaging systems to overcome them. ...
Acknowledgments We thank Marc Levoy for fruitful discussions. J. C. and I. K. were NSF Graduate Research Fellowship. X. H. was supported by the NSF of China, awards #61327902 and #61120106003. ...
doi:10.1109/cvpr.2016.406
dblp:conf/cvpr/ChangKHW16
fatcat:pbtncerja5hfjc2pzgxrldaijy
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