Fourier slice photography

Ng, Ren

doi:10.1145/1186822.1073256

Cited by 181 publications

(202 citation statements)

References 19 publications

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“…In particular, the Shack-Hartmann sensor [Shack and Platt 1971], discussed in detail below, is essentially a lensletbased light field camera . One of the core benefits of light field cameras is the ability to refocus images post-capture [Ng 2005]. This feature has so far been primarily applied for artistic purposes, although refocusing through dynamic distortions should at least in principle be possible as well.…”

Section: Related Workmentioning

confidence: 99%

Megapixel adaptive optics

Wang

Xiong

et al. 2018

ACM Trans. Graph.

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Fig. 1. We propose to use a high resolution adaptive optics (AO) technique to correct for large distortions in photography and vision applications. AO relies on the combination of a wavefront sensor and a phase modulator to measure and optically correct for incoming phase distortions. Based on a previously proposed high resolution wavefront sensor, our proposed AO prototype achieves unprecedented AO sensing and correcting simultaneous high spatial resolution for large phase distortions. An example for vision deblurring is shown on the right where a defocus distortion is being well compensated.Adaptive optics has become a valuable tool for correcting minor optical aberrations in applications such as astronomy and microscopy. However, due to the limited resolution of both the wavefront sensing and the wavefront correction hardware, it has so far not been feasible to use adaptive optics for correcting large-scale waveform deformations that occur naturally in regular photography and other imaging applications.In this work, we demonstrate an adaptive optics system for regular cameras. We achieve a significant improvement in focus for large wavefront distortions by improving upon a recently developed high resolution coded wavefront sensor, and combining it with a spatial phase modulator to create a megapixel adaptive optics system with unprecedented capability to sense and correct large distortions.

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Section: Related Workmentioning

confidence: 99%

Megapixel adaptive optics

Wang

Xiong

et al. 2018

ACM Trans. Graph.

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“…Simpler mounts and flexible masks may allow camera designs that offer user-selectable masks; photographers could then select any desired tradeoff in angle vs. spatial resolution. The design of Ng et al [2005] matches main-lens aperture (f-stop) to the micro-lens array near the detector to avoid gaps or overlaps in their coverage of the image sensor; mask-only designs avoid these concerns.…”

Section: Benefits and Limitationsmentioning

confidence: 99%

“…Sensor: The image formed on a 1D sensor is a 1D projection of the 2D light field entering the camera, which also corresponds to a slice of the light field in Fourier domain. For different focus settings, the obtained images correspond to slices at different angles/trajectories [Ng 2005].…”

Section: Effects Of Optical Elements On the Light Fieldmentioning

confidence: 99%

“…The key idea is to capture the entire 4D light field entering via the lens and incident on the camera sensor. In a conventional camera, the sensed 2D image is a 2D projection of the 4D light field [Ng 2005] and it is not possible to recover the entire 4D light field. Using a clever arrangement of optical elements, it is possible to re-bin the 4D rays and capture them using a 2D sensor [Georgiev et al 2006;Ng et al 2005].…”

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confidence: 99%

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Dappled photography

et al. 2007

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We describe a theoretical framework for reversibly modulating 4D light fields using an attenuating mask in the optical path of a lens based camera. Based on this framework, we present a novel design to reconstruct the 4D light field from a 2D camera image without any additional refractive elements as required by previous light field cameras. The patterned mask attenuates light rays inside the camera instead of bending them, and the attenuation recoverably encodes the rays on the 2D sensor. Our mask-equipped camera focuses just as a traditional camera to capture conventional 2D photos at full sensor resolution, but the raw pixel values also hold a modulated 4D light field. The light field can be recovered by rearranging the tiles of the 2D Fourier transform of sensor values into 4D planes and computing the inverse Fourier transform. In addition, one can also recover the full resolution image information for the in-focus parts of the scene.

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“…Recent computational photography methods aim to free the photographer from this choice by collecting several controlled images [16,10,2], or using specialized optics [17,13]. For example, high dynamic range (HDR) photography involves fusing images taken with varying shutter speed, to recover detail over a wider range of exposures than can be achieved in a single photo [16].…”

Section: Introductionmentioning

confidence: 99%

A Layer-Based Restoration Framework for Variable-Aperture Photography

Hasinoff

Kutulakos

2007

2007 IEEE 11th International Conference on Computer Vision

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We present variable-aperture photography, a new method for analyzing sets of images captured with different aperture settings, with all other camera parameters fixed. We show that by casting the problem in an image restoration framework, we can simultaneously account for defocus, high dynamic range exposure (HDR), and noise, all of which are confounded according to aperture. Our formulation is based on a layered decomposition of the scene that models occlusion effects in detail. Recovering such a scene representation allows us to adjust the camera parameters in post-capture, to achieve changes in focus setting or depthof-field-with all results available in HDR. Our method is designed to work with very few input images: we demonstrate results from real sequences obtained using the threeimage "aperture bracketing" mode found on consumer digital SLR cameras.

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Fourier slice photography

Cited by 181 publications

References 19 publications

Megapixel adaptive optics

Megapixel adaptive optics

Dappled photography

A Layer-Based Restoration Framework for Variable-Aperture Photography

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