Topic
Light field
About: Light field is a research topic. Over the lifetime, 5357 publications have been published within this topic receiving 87424 citations.
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Patent•
23 Jul 2008
TL;DR: In this paper, a method for using gray scale compensation to improve photo-etching exposure energy uniformity was proposed, which can effectively reduce the design and assembly hardness of the lighting system.
Abstract: The invention discloses a method for using gray scale compensation to improve photo-etching exposure energy uniformity, with wide application in non-mask photo-etching machine which uses spatial light modulator as image generator. The non-mask photo-etching machine provided with a spatial light modulator as image generator uses the gray scale modulation of the spatial light modulator, according to the image light strength distribution information of photo-etching objective lens collected by a CCD to modulate the light output of each pixel unit of the spatial light modulator to change the emission light field distribution on the image plane of the photo-etching objective lens. The invention uses the light strength distribution measured in the integration of some time or uses the energy distribution of the light emitted from each image plane position in a certain exposure time to make the exposure energy of each position uniform on the image plane. The invention can effectively reduce the design and assembly hardness of the lighting system of traditional photo-etching machine and reach better exposure energy uniformity.
34 citations
TL;DR: In this article, a theoretical study of the effects of light field distribution on the frequency response of a resonant-cavity-enhanced p-i-n photodetector is presented.
Abstract: We present a theoretical study of the effects of light field distribution on the frequency response of a resonant-cavity-enhanced p-i-n photodetector. Taking advantage of the flexibility of cavity design, one can tailor the light field distribution in the absorption region. Because of the difference in velocities of the carriers, the speed performances of the detector depend on the field distribution and the cavity design. The results of our work indicate that when the maximum of light field intensity happens near the p/sup +/ edge of the depletion layer, the device shows the best speed performance. The frequency response, the impulse response, and the step response have been calculated for different structures to demonstrate the importance of the field distribution.
34 citations
13 May 2016
TL;DR: A supervised four-dimensional (4D) light field segmentation method that uses a graph-cut algorithm and designs a learning-based likelihood, called objectness, which utilizes appearance and disparity cues to obtain higher segmentation accuracy.
Abstract: In this paper, we describe a supervised four-dimensional (4D) light field segmentation method that uses a graph-cut algorithm. Since 4D light field data has implicit depth information and contains redundancy, it differs from simple 4D hyper-volume. In order to preserve redundancy, we define two neighboring ray types (spatial and angular) in light field data. To obtain higher segmentation accuracy, we also design a learning-based likelihood, called objectness, which utilizes appearance and disparity cues. We show the effectiveness of our method via numerical evaluation and some light field editing applications using both synthetic and real-world light fields.
34 citations
TL;DR: In this article, the influence of optical retarders on the isochromatic fringes obtained by automated white light photoelasticity using methods such as those based on spectral content analysis (SCA) and on primary colour (red, green and blue) analysis was examined.
Abstract: This paper deals with the influence of optical retarders on the isochromatic fringes obtained by automated white light photoelasticity using methods such as those based on spectral content analysis (SCA) and on primary colour (red, green and blue) analysis. In the following the light intensity equations of dark- and light-field polariscopes with both crossed and parallel optical retarders are reviewed. In particular, it is shown that the retardance error of the quarter-wave plates produces an attenuation of the maximum intensity in dark field and an increase of minimum intensity in light field. Experimental evidence of the influence of optical retarders is also shown.
33 citations
Patent•
03 Apr 1998TL;DR: In this paper, a method for particle size detection comprises passing particles in a fluid medium relative to a light source which generates a light field the optical axis of which is transverse to the direction of fluid movement relative to the said light source.
Abstract: A method for particle size detection comprises passing particles in a fluid medium relative to a light source which generates a light field the optical axis of which is transverse to the direction of fluid movement relative to the said light source and having a plurality of non-interferometrically formed variations in intensity spaced along the direction of movement of the particles relative to the light field, detecting variations in light intensity caused by the particles as they pass through the variations in the light field, and measuring the size of a detected particle substantially independently of the optical characteristics of the particle by plotting the mean peak signal as a function of the normalised peak-to-trough variation in the output pulses generated by the passages of the particle through the light field.
33 citations