Hadamard single pixel camera

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Richard Baraniuk Humans are visual animals, and imaging sensors that extend our reach — cameras — have improved dramatically in recent times thanks to the introduction of CCD and CMOS digital technology. Consumer digital cameras in the mega-pixel range are now ubiquitous thanks to the happy coincidence that the semiconductor material of choice for large-scale electronics integration silicon also happens to readily convert photons at visual wavelengths into electrons.

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On the contrary, imaging at wavelengths where silicon is blind is considerably more complicated, bulky, and expensive. In this paper, we present a new approach to building simpler, smaller, and cheaper digital cameras that can operate efficiently across a much broader spectral range than conventional silicon-based cameras.

Our approach fuses a new camera architecture based on a digital micromirror device DMD hadamard single pixel camera single pixel camera see Sidebar: Spatial Light Modulators with the new mathematical theory and algorithms of compressive sampling CS — see Sidebar: Compressive Sampling in a Nutshell.

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CS combines sampling and compression into a single nonadaptive linear measurement process [1—4]. Rather than measuring pixel samples of the scene under view, we measure inner products.

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