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Media 2: Lensless object scanning holography for two-dimensional mirror-like and diffuse reflective objects

Vicente Micó, Carlos Ferreira & Javier García
Originally published in Applied Optics on 01 September 2013 (ao-52-25-6390)

Media 2: Lensless object scanning holography for two-dimensional mirror-like and diffuse reflective objects

Vicente Micó, Carlos Ferreira & Javier García
Originally published in Applied Optics on 01 September 2013 (ao-52-25-6390)

Lensless object scanning holography for two-dimensional mirror-like and diffuse reflective objects

Vicente Micó, Carlos Ferreira & Javier García
Recently proposed lensless object scanning holography (LOSH) [Opt. Express20, 9382 (2012)] is a fully lensless method capable of improving the image quality in digital Fourier holography applied to one-dimensional (1D) reflective objects and it involves a very simplified experimental setup. LOSH is based on the recording and digital postprocessing of a set of digital lensless Fourier transform holograms, which finally results in a synthetic image with improved resolution, field-of-view (FOV), signal-to-noise ratio (SNR), and depth...

Lensless object scanning holography for two-dimensional mirror-like and diffuse reflective objects

Vicente Micó, Carlos Ferreira & Javier García
Recently proposed lensless object scanning holography (LOSH) [Opt. Express20, 9382 (2012)] is a fully lensless method capable of improving the image quality in digital Fourier holography applied to one-dimensional (1D) reflective objects and it involves a very simplified experimental setup. LOSH is based on the recording and digital postprocessing of a set of digital lensless Fourier transform holograms, which finally results in a synthetic image with improved resolution, field-of-view (FOV), signal-to-noise ratio (SNR), and depth...

Media 1: Lensless object scanning holography for two-dimensional mirror-like and diffuse reflective objects

Vicente Micó, Carlos Ferreira & Javier García
Originally published in Applied Optics on 01 September 2013 (ao-52-25-6390)

Media 1: Lensless object scanning holography for two-dimensional mirror-like and diffuse reflective objects

Vicente Micó, Carlos Ferreira & Javier García
Originally published in Applied Optics on 01 September 2013 (ao-52-25-6390)

Media 2: Estimation of hyperspectral inherent optical properties from in-water radiometry: error analysis and application to in situ data

Eric Rehm & Curtis D. Mobley
Originally published in Applied Optics on 01 February 2013 (ao-52-4-795)

Media 2: Estimation of hyperspectral inherent optical properties from in-water radiometry: error analysis and application to in situ data

Eric Rehm & Curtis D. Mobley
Originally published in Applied Optics on 01 February 2013 (ao-52-4-795)

Estimation of hyperspectral inherent optical properties from in-water radiometry: error analysis and application to in situ data

Eric Rehm & Curtis D. Mobley
An inverse algorithm is developed to retrieve hyperspectral absorption and backscattering coefficients from measurements of hyperspectral upwelling radiance and downwelling irradiance in vertically homogeneous waters. The forward model is the azimuthally averaged radiative transfer equation, efficiently solved by the EcoLight radiative transfer model, which includes the effects of inelastic scattering. Although this inversion problem is ill posed (the solution is ambiguous for retrieval of total scattering coefficients), unique and stable solutions can be found for...

Estimation of hyperspectral inherent optical properties from in-water radiometry: error analysis and application to in situ data

Eric Rehm & Curtis D. Mobley
An inverse algorithm is developed to retrieve hyperspectral absorption and backscattering coefficients from measurements of hyperspectral upwelling radiance and downwelling irradiance in vertically homogeneous waters. The forward model is the azimuthally averaged radiative transfer equation, efficiently solved by the EcoLight radiative transfer model, which includes the effects of inelastic scattering. Although this inversion problem is ill posed (the solution is ambiguous for retrieval of total scattering coefficients), unique and stable solutions can be found for...

Media 1: Estimation of hyperspectral inherent optical properties from in-water radiometry: error analysis and application to in situ data

Eric Rehm & Curtis D. Mobley
Originally published in Applied Optics on 01 February 2013 (ao-52-4-795)

Media 1: Estimation of hyperspectral inherent optical properties from in-water radiometry: error analysis and application to in situ data

Eric Rehm & Curtis D. Mobley
Originally published in Applied Optics on 01 February 2013 (ao-52-4-795)

Media 1: Depth estimation and image recovery using broadband, incoherent illumination with engineered point spread functions [Invited]

Sean Quirin & Rafael Piestun
Originally published in Applied Optics on 01 January 2013 (ao-52-1-A367)

Media 1: Depth estimation and image recovery using broadband, incoherent illumination with engineered point spread functions [Invited]

Sean Quirin & Rafael Piestun
Originally published in Applied Optics on 01 January 2013 (ao-52-1-A367)

Depth estimation and image recovery using broadband, incoherent illumination with engineered point spread functions [Invited]

Sean Quirin & Rafael Piestun
The use of complementary engineered point spread functions is proposed for the joint tasks of depth estimation and image recovery over an extended depth of field. A digital imaging system with a dynamically adjustable pupil is demonstrated experimentally. The implementation of a broadband, passive camera is demonstrated with a fractional ranging error of 4/104 at a working distance of 1 m. Once the depth and brightness information of a scene are obtained, a synthetic camera is...

Depth estimation and image recovery using broadband, incoherent illumination with engineered point spread functions [Invited]

Sean Quirin & Rafael Piestun
The use of complementary engineered point spread functions is proposed for the joint tasks of depth estimation and image recovery over an extended depth of field. A digital imaging system with a dynamically adjustable pupil is demonstrated experimentally. The implementation of a broadband, passive camera is demonstrated with a fractional ranging error of 4/104 at a working distance of 1 m. Once the depth and brightness information of a scene are obtained, a synthetic camera is...

Media 2: Optical coherence tomography for vulnerability assessment of sandstone

Elizabeth Bemand & Haida Liang
Originally published in Applied Optics on 10 May 2013 (ao-52-14-3387)

Media 2: Optical coherence tomography for vulnerability assessment of sandstone

Elizabeth Bemand & Haida Liang
Originally published in Applied Optics on 10 May 2013 (ao-52-14-3387)

Optical coherence tomography for vulnerability assessment of sandstone

Elizabeth Bemand & Haida Liang
Sandstone is an important cultural heritage material, in both architectural and natural settings, such as neolithic rock art panels. The majority of deterioration effects in porous materials such as sandstone are influenced by the presence and movement of water through the material. The presence of water within the porous network of a material results in changes in the optical coherence tomography signal intensity that can be used to monitor the wetting front of water penetration...

Optical coherence tomography for vulnerability assessment of sandstone

Elizabeth Bemand & Haida Liang
Sandstone is an important cultural heritage material, in both architectural and natural settings, such as neolithic rock art panels. The majority of deterioration effects in porous materials such as sandstone are influenced by the presence and movement of water through the material. The presence of water within the porous network of a material results in changes in the optical coherence tomography signal intensity that can be used to monitor the wetting front of water penetration...

Media 1: Optical coherence tomography for vulnerability assessment of sandstone

Elizabeth Bemand & Haida Liang
Originally published in Applied Optics on 10 May 2013 (ao-52-14-3387)

Media 1: Optical coherence tomography for vulnerability assessment of sandstone

Elizabeth Bemand & Haida Liang
Originally published in Applied Optics on 10 May 2013 (ao-52-14-3387)

Media 1: Open-access operating algorithms for commercial videokeratographer and improvement of corneal sampling

Julián Espinosa, David Mas, Jorge Pérez & Ana Belén Roig
Originally published in Applied Optics on 01 March 2013 (ao-52-7-C24)

Media 1: Open-access operating algorithms for commercial videokeratographer and improvement of corneal sampling

Julián Espinosa, David Mas, Jorge Pérez & Ana Belén Roig
Originally published in Applied Optics on 01 March 2013 (ao-52-7-C24)

Open-access operating algorithms for commercial videokeratographer and improvement of corneal sampling

Julián Espinosa, David Mas, Jorge Pérez & Ana Belén Roig
We present an algorithm to process images of reflected Placido rings captured by a commercial videokeratoscope. Raw data are obtained with no Cartesian-to-polar-coordinate conversion, thus avoiding interpolation and associated numerical artifacts. The method provides a characteristic equation for the device and is able to process around 6 times more corneal data than the commercial software. Our proposal allows complete control over the whole process from the capture of corneal images until the computation of curvature...

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