Brightness Research Papers - Academia.edu (original) (raw)

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A method is presented for the recovery of optical flow. The key idea is that the local spatial structure of optical flow, with the exception of surface boundaries, is usually rather coherent and can thus be appropriately approximated by a... more

A method is presented for the recovery of optical flow. The key idea is that the local spatial structure of optical flow, with the exception of surface boundaries, is usually rather coherent and can thus be appropriately approximated by a linear vector field. According to the proposed method, the optical flow components and their first order spatial derivatives are computed

10 High-Dynamic Range Imaging for Dynamic Scenes Celine Loscos and Katrien Jacobs 10.1 Introduction................................................................ 259 10.2 High-Dynamic Range Images:... more

10 High-Dynamic Range Imaging for Dynamic Scenes Celine Loscos and Katrien Jacobs 10.1 Introduction................................................................ 259 10.2 High-Dynamic Range Images: Definition.................................... 261 10.3 HDR Image Creation from Multiple Exposures........ ...

A neural network model is developed to explain how visual thalamocortical interactions give rise to boundary percepts such as illusory contours and surface percepts such as filled-in brightnesses. Top-down feedback interactions are needed... more

A neural network model is developed to explain how visual thalamocortical interactions give rise to boundary percepts such as illusory contours and surface percepts such as filled-in brightnesses. Top-down feedback interactions are needed in addition to bottom-up feed-forward interactions to simulate these data. One feedback loop is modeled between lateral geniculate nucleus (LGN) and cortical area V1, and another within cortical areas V1 and V2. The first feedback loop realizes a matching process which enhances LGN cell activities that are consistent with those of active cortical cells, and suppresses LGN activities that are not. This corticogeniculate feedback, being endstopped and oriented, also enhances LGN ON cell activations at the ends of thin dark lines, thereby leading to enhanced cortical brightness percepts when the lines group into closed illusory contours. The second feedback loop generates boundary representations, including illusory contours, that coherently bind dist...

Cockpit lighting can interfere with the proper operation of night vision goggles (NVGs) in several specific ways. For each interference mechanism, the effect on the image seen through the NVGs is to reduce the brightness of portions of... more

Cockpit lighting can interfere with the proper operation of night vision goggles (NVGs) in several specific ways. For each interference mechanism, the effect on the image seen through the NVGs is to reduce the brightness of portions of the image and/or reduce the contrast of the useful image (the view outside the aircraft). This reduction in brightness or contrast may be manifested as a reduction in visual acuity and/or as an observed loss of contrast or brightness. AFRL/HECV was requested by the FAA (this research effort was jointly funded by the FAA and AFRL/HECV) to investigate low-cost, alternative methodologies that can be used by civil aviation to evaluate NVG cockpit lighting compatibility. In order to facilitate the inexpensive evaluation of cockpit lighting interference with the operation of the NVGs, a field evaluation kit was developed. This kit makes it possible to conduct a low-cost version of the standard visual acuity test method currently used by the Air Force. This ...

Eu2+, Dy3+ and Gd3+ co-doped strontium aluminate yellow-green phosphor was synthesized by combustion method using urea as reducer at 600 °C. The crystallization, particles size and luminescence properties of the sample have been... more

Eu2+, Dy3+ and Gd3+ co-doped strontium aluminate yellow-green phosphor was synthesized by combustion method using urea as reducer at 600 °C. The crystallization, particles size and luminescence properties of the sample have been investigated. The results are as follows: Eu2+, Dy3+ and Gd3+ doped into the phosphor do not change the crystalline structure of strontium aluminate. The average size of particles is about 100 nm. The excitation and emission spectra are broad bands with the peaks at 348 and 515 nm, respectively. Compared with SrAl2O4: Eu2+, Dy3+ phosphor, the initial brightness improved and the afterglow time prolonged.

This paper presents an integrated color imaging system for taking images in extremely high dynamic range scenes. The system first fuses five differently exposed images in raw data such that the effective dynamic range of the fused raw... more

This paper presents an integrated color imaging system for taking images in extremely high dynamic range scenes. The system first fuses five differently exposed images in raw data such that the effective dynamic range of the fused raw data is extended to 256 times. Then it runs several edge detection iterations to extract the image details in different luminance levels

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