Results 111 to 120 of about 155 (152)
Some of the next articles are maybe not open access.
Photometric Technique For Deriving A
Optical Engineering, 1981The technique described results in a display gamma function where the contrast between each of the steps is equally discriminable. Digital cathode ray tube (CRT) (and film) displays set up using this technique tend to have high image quality as judged by reconnaissance image interpreters.
openaire +1 more source
Review of techniques for photometric redshift estimation
SPIE Proceedings, 2012A photometric redshift provides an estimate for the distance of an astronomical object, such as a galaxy or quasar, which is a powerful statistical tool for studies of evolutionary properties of galaxies, in particular of faint galaxies, since their spectroscopic data are hard or impossible to obtain.
Hongwen Zheng, Yanxia Zhang
openaire +1 more source
Photometric Normalization Techniques for Illumination Invariance
2010Face recognition technology has come a long way since its beginnings in the previous century. Due to its countless application possibilities, it has attracted the interest of research groups from universities and companies around the world. Thanks to this enormous research effort, the recognition rates achievable with the state-of-the-art face ...
Vitomir Štruc +3 more
openaire +1 more source
Illumination Invariant L1 Tracker Using Photometric Normalization Techniques
2013 2nd IAPR Asian Conference on Pattern Recognition, 2013Recently, sparse representation-based tracking methods called l1 trackers give remarkable performances in difficult video sequences. However, the tracking in the situation of large illumination changes and shadow casting still has serious problems that need to be solved.
Quang Nhat Vo +2 more
openaire +1 more source
Photometric Accuracy of an Adaptive Filtering Technique
1988The results of an application of the Babelsberg Image Processing System, an adaptive filtering technique, to the two-dimensional photometric mapping of galaxies are reported. On the basis of our studies of NGC 3379 we found no systematic errors in the photometric calibration and in the reduction procedure, with mean residuals from the other studies not
M. Capaccioli, H. Lorenz, G. M. Richter
openaire +1 more source
Photometric techniques, performance and PSF characterization of GeMS
SPIE Proceedings, 2016GeMS is the multi-conjugate adaptive optics instrument at the Gemini South telescope in Chile, the first facility-class MCAO system and the first to use laser guide stars. During its science verification period we have observed the Galactic globular cluster NGC 1851 and here we discuss the optimization of the analysis techniques that we adopt to ...
Turri, Paolo +6 more
openaire +2 more sources
Photometric scanning techniques for measurement of blood vessel dimensions
Microvascular Research, 1973Abstract Two methods are described for measurement of vessel diameter in the microcirculation. One technique consists of scanning across the vessel with a moving spot of light. The drop in light transmission as the light moves behind the vessel is detected by a photomultiplier tube. The period of time that the spot is hidden behind the vessel is used
openaire +2 more sources
CCD Scanning Technique Applied to Millisecond Photometric Observations
2001We show how inherent features of CCD scanning technique are advantageous for fast (in the order of millisecond) photometric observations (FPO), even with submeter class telescopes. In particular, lunar occultations and speckle interferometry experiences has been carried out using this technique.
O. Fors, J. Núñez
openaire +1 more source
Validation of Photometric Modeling Techniques for Retroreflective Traffic Signs
Transportation Research Record: Journal of the Transportation Research Board, 2004Recent research in the United States has focused on the development of minimum retroreflectivity levels for traffic signs. The engineered approach uses a supply luminance versus demand luminance concept to achieve a metric that can be used to set minimum retroreflectivity levels.
Carlson, Paul J, Urbanik, Thomas
openaire +2 more sources
A New Photometric Technique using a Variable Shutter Device
Nature, 1961THE present standard of accuracy in spectrophotometric measurement is unsatisfactory, partly because of the limitations of conventional techniques. In the measurement of spectral transmission of coloured filters, for example, the precision obtainable from commercially available instruments is limited to ± 1/103 of full-scale reading, while the accuracy
O. C. JONES, F. J. J. CLARKE
openaire +1 more source