Journal ArticleDOI
Coded aperture imaging with multiple measurements
TLDR
In this article, a general theory of coded aperture imaging with multiple measurements is presented, and an image reconstruction scheme from the coded images is described that results in a maximum signal-to-noise ratio.Abstract:
In coded aperture imaging, only aperture arrays consisting of (0, 1) elements are physically realizable. If multiple coded images are obtained with different aperture masks and the resulting detector images are suitably combined, a larger variety of aperture arrays, such as multilevel, complex-valued, vector-valued, or complementary arrays becomes applicable. We present a general theory of coded aperture imaging with multiple measurements. An image reconstruction scheme from the coded images is described that results in a maximum signal-to-noise ratio. Also, the design of sets of aperture arrays is addressed and explicitly solved for several important cases. It is shown how known classes of correlation arrays can be beneficially applied to coded aperture imaging.read more
Citations
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Point spread function engineering for scene recovery
Shree K. Nayar,Changyin Zhou +1 more
TL;DR: In this paper, a depth recovery technique using an optical diffuser is proposed, where the scatter angle of the diffuser determines the system's effective aperture. But the depth estimation accuracy is limited by the camera's physical size.
Proceedings ArticleDOI
Multiple walker recognition using wireless distributed pyro-electric sensors
Nanxiang Li,Qi Hao +1 more
TL;DR: The experimental results show that the proposed pyroelectric sensor system has potential to be a reliable biometric system for the verification/identification of a small group of human objects, whose applications include security monitoring, human-machine interfaces, and virtual environments.
Proceedings ArticleDOI
Localization of scattering centers in radar imaging based on sparsity constraints
TL;DR: Results show that significant clutter reduction and improvement in localization of scattering centers are achieved at an optimum sparsity constraint ratio.
Patent
Coded aperture imaging apparatus performing image enhancement
TL;DR: In this paper, a method of processing data acquired from a coded aperture imaging apparatus comprises processing the data to form a first image and subsequently performing at least one image enhancement step; the image forming step may use a Tikhonov regularisation technique, Weiner filter technique or a Landweber iteration.
Compressive gait biometric
TL;DR: This research would not have been possible without the support of my friends and fellow graduate students and of course my family who never stopped encouraging me to persist.
References
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PatentDOI
Coded aperture imaging with uniformly redundant arrays
E. E. Fenimore,Thomas M. Cannon +1 more
TL;DR: Computer simulations show that the URA with significant shot and background noise is vastly superior to random array techniques without noise, and permits a detector which is smaller than its random array counterpart.
Journal ArticleDOI
Pseudo-random sequences and arrays
TL;DR: A simple description of pseudo-random sequences, or maximal-length shift-register sequences, and two-dimensional arrays of area n = 2lm- 1 with the same property.
Journal ArticleDOI
New family of binary arrays for coded aperture imaging
TL;DR: With the addition of MURAs to the family of binary arrays, all prime numbers can now be used for making optimal coded apertures, increasing the number of available square patterns by more than a factor of 3.
Book
Cyclic difference sets
TL;DR: In this paper, the authors discuss the existence questions and constructive existence tests for multipliers and constructiveness tests for difference sets of special type and families of difference sets, and their applications.