Coded Aperture Pairs for Depth from Defocus and Defocus Deblurring

The classical approach to depth from defocus (DFD) uses lenses with circular apertures for image capturing. We show in this paper that the use of a circular aperture severely restricts the accuracy of DFD. We derive a criterion for evaluating a pair of apertures with respect to the precision of dept...

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Bibliographic Details
Published in:International journal of computer vision Vol. 93; no. 1; pp. 53 - 72
Main Authors: Zhou, Changyin, Lin, Stephen, Nayar, Shree K.
Format: Journal Article
Language:English
Published: Boston Springer US 01.05.2011
Springer
Springer Nature B.V
Subjects:
Algorithms
Aperture
Apertures
Applied sciences
Artificial Intelligence
Cameras
Complement
Computer Imaging
Computer Science
Computer science; control theory; systems
Computer simulation
Computer vision
Criteria
Exact sciences and technology
Genetic algorithms
Image Processing and Computer Vision
Noise
Optimization
Pattern Recognition
Pattern Recognition and Graphics
Pattern recognition. Digital image processing. Computational geometry
Preserves
Searching
Simulation
Software
Vision
Depth from defocus
Coded aperture
Deconvolution
Defocus deblurring
Fidelity
Gradient
High resolution
Computer simulation
Image processing
Noise reduction
Blurred image
Search algorithm
Image quality
Genetic algorithm
Signal to noise ratio
ISSN:0920-5691, 1573-1405
Online Access:Get full text
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Summary:The classical approach to depth from defocus (DFD) uses lenses with circular apertures for image capturing. We show in this paper that the use of a circular aperture severely restricts the accuracy of DFD. We derive a criterion for evaluating a pair of apertures with respect to the precision of depth recovery. This criterion is optimized using a genetic algorithm and gradient descent search to arrive at a pair of high resolution apertures. These two coded apertures are found to complement each other in the scene frequencies they preserve. This property enables them to not only recover depth with greater fidelity but also obtain a high quality all-focused image from the two captured images. Extensive simulations as well as experiments on a variety of real scenes demonstrate the benefits of using the coded apertures over conventional circular apertures.
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ISSN:0920-5691
1573-1405
DOI:10.1007/s11263-010-0409-8