PURPOSE To show how an incorrect manifest astigmatism axis can cause an abnormal induced astigmatism on a new axis. PATIENTS AND METHODS Four eyes of three patients were treated primarily with WaveLight® EX500 wavefront optimized (WFO) treatments for astigmatism. All four eyes needed enhancements and were analyzed retrospectively via WaveLight® Contoura to determine the reason for the incorre...

Correction of digital elevation models (DEMs) for flat areas is a critical process for hydrological analyses and modeling, such as the determination of flow directions and accumulations, and the delineation of drainage networks and sub-basins. In this study, a new algorithm is proposed for flat correction/removal. It uses the puddle delineation (PD) program to identify depressions (including th...

In this paper, we present the systems developed by GTMUVigo team for the Multimedia Person Discovery in Broadcast TV task at MediaEval 2015. The systems propose two different strategies for person discovery in audio through speaker diarization (one based on an online clustering strategy with error correction using OCR information and the other based on agglomerative hierarchical clustering) as ...

Satellite images in mountainous areas are strongly affected by topography. Different studies demonstrated that the results of semi-empirical topographic correction algorithms improved when a stratification of land covers was carried out first. However, differences in the stratification strategies proposed and also in the evaluation of the results obtained make it unclear how to implement them. ...

Advanced methods of geo-atmospheric preprocessing have become available in the past years and increasingly are applied to AVIRIS airborne imagery. Both, the geometric as well as the atmospheric part of the preprocessing have their specific impact on data quality which should be aware to scientists using such corrected data. An integral geoatmospheric correction has been developed in a joint eff...

The numerical equivalent source is used to correct distortions in gravity anomalies caused by topographic relief. The error involved in the topographic correction is a function of the depth of the equivalent source. The optimum depth of the equivalent source is that which maximizes the smoothness of the calculated anomaly between control points. The technique is straightforward and can be incor...

The problem of anisotropic reflectance in mountainous terrain is well known. It was required to determine the efficacy of anisotropic reflectance correction (ARC) of imagery acquired over the western Himalaya. The Minnaert correction procedure was evaluated using a single Minnaert constant (k), locally computed ks and land cover-computed ks. Findings illustrate the need for computing ks, such t...