For the vehicle detection and tracking in the roundabouts, several difficulties have to be faced, e.g. the use of non nadiral perspectives, vehicle images overlapping and radiometric differences between top and side of the cars; the silhouette of the cars is, besides, not regular and the size is variable. In the paper, the upgrade of a procedure for detecting and tracking vehicles in a roundabo...

Radiometric calibration of airborne laser scanning (ALS) intensity data aims at retrieving a value related to the target scattering properties, which is independent on the instrument or flight parameters. The aim of a calibration procedure is also to be able to compare results from different flights and instruments, but practical applications are sparsely available, and the performance of calib...

The estimation of geophysical parameters from SAR data necessitates well calibrated sensors with good radiometric precision. In this paper, the radiometric calibration of ASAR/ENVISAT sensor was assessed by comparing ASAR data with ERS-2 and RADARSAT-1 SAR data. With regard to recent data, acquired at the end of 2005, the difference varies from -0.72dB to +0.72dB, with temporal variations that ...

During a 12-month period, 19,457 blood cultures were collected. Yeasts were isolated from 193 cultures derived from 76 cancer patients. Candida albicans or Candida tropicalis accounted for 79% of isolates. Of the three methods compared, the radiometric method required 2.9 days to become positive, "blind" subculture required 2.6 days, and Gram stains required 1 day. However, the radiometric meth...

Optical flow has been commonly defined as the apparent motion of image brightness patterns in an image sequence. In this paper, we propose a revised definition to overcome shortcomings in interpreting optical flow merely as a geometric transformation field. The new definition is a complete representation of geometric and radiometric variations in dynamic imagery. We argue that this is more cons...

Two neural network algorithms trained by a physical vegetation model are used to retrieve soil moisture and vegetation variables of wheat canopies during the whole crop cycle. The first algorithm retrieves soil moisture using L band, two polarizations and multiangular radiometric data, for each single date of radiometric acquisition. The algorithm includes roughness and vegetation effects, but ...

In a real stereo vision system, the acquired stereo images suffer from varying radiometric changes due to illumination and camera parameter changes. Therefore, we propose an effective matching scheme created by building a content adaptive descriptor. Specifically, the descriptor reflects image contents and its element are adaptively weighted and applied to estimate the correct corresponding pix...

Comparative study on radiometric calibration methods among onboard, cross and vicarious calibration for visible to near infrared radiometers onboard satellites is conducted. The data sources of the aforementioned three calibration methods are different and independent. Therefore, it may say that the reliable Radiometric Calibration Accuracy: RCC would be the RCC which are resemble each other tw...

The success of any remote sensing program is directly related to the knowledge of both spectral and radiometric characteristics of the sensors involved. The Brazilian remote sensing user’s community has explored the relationship between orbital radiometric data and biophysical data since the beginning of the nineties using the Thematic Mapper (TM) sensor as the main source of data. Since the fi...

A total of 140 mycobacterial isolates from patients treated at Fitzsimons Army Medical Center or the National Jewish Hospital and Research Center and from animal specimens submitted to the National Veterinary Services Laboratory were tested by using a urease procedure modified for use with a BACTEC model 301. Mycobacterial suspensions were prepared by using Middlebrook 7H10 Tween broth. Of the ...