4 Basic Optical Instruments

Goodman, Douglas S.

doi:10.1016/s0076-695x(08)60212-4

Cited by 4 publications

(1 citation statement)

References 94 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is similar to a classic problem in microscopy, where the image of the filament would be visible on the sample. Placing the object plane Koehler illumination has become the standard technique to provide an evenly illuminated field at the object plane [10].…”

Section: Chapter 3 Spectral Calibrationmentioning

confidence: 99%

Perceptually based tone mapping for low-light conditions

Kirk

O’Brien

2011

ACM SIGGRAPH 2011 Papers

View full text Add to dashboard Cite

We present a perceptually based algorithm for modeling the color shift that occurs for human viewers in low-light scenes. Known as the Purkinje effect, this color shift occurs as the eye transitions from photopic, cone-mediated vision in well-lit scenes to scotopic, rod-mediated vision in dark scenes. At intermediate light levels vision is mesopic with both the rods and cones active. Although the rods have a spectral response distinct from the cones, they still share the same neural pathways. As light levels decrease and the rods become increasingly active they cause a perceived shift in color. We model this process so that we can compute perceived colors for mesopic and scotopic scenes from spectral data. While our tone mapping operator works with spectral data from any source, we show how to produce spectral data of static scenes using multiple images and a camera with known spectral sensitivity. If the spectral sensitivity isn't provided by the camera manufacturer, we describe a one-time calibration procedure to estimate the sensitivity. Should obtaining spectral data of a scene be infeasible, we also describe how the effect can be approximated from high dynamic range RGB images by learning a mapping from RGB to rod and cone responses. Once we have determined rod and cone responses either directly or through our approximation process, we map them to RGB values that can be displayed on a standard monitor to elicit the same color perception when viewed photopically. Our tone mapping method focuses on computing the color shift associated with low-light conditions and leverages current HDR techniques to control the image dynamic range. We include results generated from both spectral and RGB images as well as experimental data.

show abstract

Section: Chapter 3 Spectral Calibrationmentioning

confidence: 99%

Perceptually based tone mapping for low-light conditions

Kirk

O’Brien

2011

ACM SIGGRAPH 2011 Papers

View full text Add to dashboard Cite

show abstract

Compact system for fast on-line geometry characterization of facets for solar concentrators

Chekh

Fernández-Reche²,

Valenzuela³

et al. 2022

AIP Conference Proceedings

View full text Add to dashboard Cite

Toward the development of miniaturized imaging systems for detection of pre-cancer

Descour

Kärkkäinen

Rogers

et al. 2002

IEEE J. Quantum Electron.

View full text Add to dashboard Cite

In this paper, we describe the progress toward the development of miniaturized imaging systems with applications in medical imaging, and specifically, detection of pre-cancer. The focus of the article is a miniature, optical-sectioning, fluorescence microscope. The miniature microscope is constructed from lithographically printed optics and assembled using a bulk micromachined silicon microoptical table. Optical elements have been printed in a negative tone hybrid glass to a maximum depth of 59 m and an rms surface roughness between 10-45 nm, fulfilling the requirements of the miniature microscope. Test optical elements have been assembled using silicon-spring equipped mounting slots. The design of silicon springs is presented in this paper. Optical elements can be assembled within the tolerances of an NA = 0 4 miniature microscope objective, confirming the concept of simple, zero-alignment assembly.

show abstract

4 Basic Optical Instruments

Cited by 4 publications

References 94 publications

Perceptually based tone mapping for low-light conditions

Perceptually based tone mapping for low-light conditions

Compact system for fast on-line geometry characterization of facets for solar concentrators

Toward the development of miniaturized imaging systems for detection of pre-cancer

Contact Info

Product

Resources

About